ML21120A211

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2020 Annual Radioactive Effluent Release Report
ML21120A211
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 04/30/2021
From: Rasmussen M
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML21120A211 (165)
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Text

1\14 TENNESSEE VALLEY AUTHORITY Post Office Box 2000, Decatur, Alabama 35609-2000 April 30, 2021 10 CFR 50.4 10 CFR 50.36 §a 10 CFR 50 Appendix I ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Renewed Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296

Subject:

2020 Annual Radioactive Effluent Release Report In accordance with the Browns Ferry Nuclear Plant (BFN), Units 1, 2, and 3, Technical Specification Section 5.6.3, the Tennessee Valley Authority is submitting the BFN Annual Radioactive Effluent Release Report for the period January through December 2020. This document is in conformance with Title 10 of the Code of Federal Regulations (10 CFR) 50.36a and 10 CFR 50, Appendix I, Section IV.B.1.

There are no new regulatory commitments contained in this letter. Should you have any questions concerning this submittal, please contact Jamie Paul at (256) 729-2636.

Respectfully, p y, M. M. Rasmussen Site Vice President

Enclosure:

2020 Annual Radioactive Effluent Release Report cc (w/ Enclosures):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant

ENCLOSURE Browns Ferry Nuclear Plant Units 1, 2, and 3 2020 Annual Radioactive Effluent Release Report See Enclosed

Browns Ferry Nuclear Plant Tennessee Valley Authority Annual Radioactive Effluent Release Report 2020

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report I. Supplemental Information .................................................................................................................... 4 A. Regulatory Limits .............................................................................................................................. 4 B. Limitation on Dose Rate .................................................................................................................... 4 C. Average Energy ................................................................................................................................. 5 D. Measurements & Approximations of Total Radioactivity ................................................................. 5 E. Batch Releases .................................................................................................................................. 7 F. Abnormal Releases............................................................................................................................ 8 G. Nonroutine, Planned Discharges ..................................................................................................... 9 H. Radioactive Waste System Treatment Changes ............................................................................... 9 I. Land Use Census Changes ................................................................................................................. 9 J. Effluent Monitoring Instrument Inoperability > 30 Days .................................................................. 9 K. Effluent Monitoring Equipment Sample Deviation ........................................................................... 9 L. Offsite Dose Calculation Manual Changes ........................................................................................ 9 M. Groundwater Monitoring and Program (NEI 0707) ................................................................... 10 Table 9 Groundwater Data ................................................................................................................... 11 N. Errata/Corrections to Previous ARERRs .......................................................................................... 12 II. Gaseous Effluents ............................................................................................................................... 13 Table 1A Gaseous Effluents Summation of all Releases ...................................................................... 13 Table 1B Gaseous Effluents - Ground Level Releases (Batch) ............................................................... 14 Table 1B Gaseous Effluents - Ground Level Releases (Continuous) ..................................................... 15 Table 1C Gaseous Effluents - Elevated Releases (Batch) ...................................................................... 16 Table 1C Gaseous Effluents - Elevated Releases (Continuous) ............................................................. 17 Table 1D Gaseous Effluents - Mixed Mode Releases (Batch) ............................................................... 18 Table 1D Gaseous Effluents - Mixed Mode Releases (Continuous) ...................................................... 19 III. Liquid Effluents ............................................................................................................................... 20 Table 2A Liquid Effluents Summation of all Releases .......................................................................... 20 Table 2B Liquid Effluents - Batch Mode ................................................................................................ 21 Table 2B Liquid Effluents - Continuous Mode....................................................................................... 21 IV. Solid Waste Storage and Shipment ................................................................................................. 22 A. Solid Waste Shipped Offsite for Burial or Disposal (Not Irradiated Fuel) ...................................... 22 B. Irradiated Fuel Shipments (Disposition) ......................................................................................... 25 V. Radiological Impact to Man ................................................................................................................ 26 A. Introduction .................................................................................................................................... 26 Page 2 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report B. Dose Limits ...................................................................................................................................... 26 C. Dose Calculations ............................................................................................................................ 27 D. Doses from Airborne Effluents........................................................................................................ 27 E. Doses from Liquid Effluents ............................................................................................................ 29 F. Population Doses ............................................................................................................................ 30 G. Offsite Direct Radiation Dose.......................................................................................................... 30 H. Dose to a Member of the Public Inside the Site Boundary ............................................................. 31 I. Total Dose ....................................................................................................................................... 31 J. Tables .............................................................................................................................................. 32 Table 3A Doses from Airborne Effluents - 1st Quarter .......................................................................... 32 Table 3B Doses from Airborne Effluents - 2nd Quarter ......................................................................... 33 Table 3C Doses from Airborne Effluents - 3rd Quarter .......................................................................... 34 Table 3D Doses from Airborne Effluents - 4th Quarter.......................................................................... 35 Table 4A Doses from Liquid Effluents - 1st Quarter............................................................................... 36 Table 4B Doses from Liquid Effluents - 2nd Quarter .............................................................................. 36 Table 4C Doses from Liquid Effluents - 3rd Quarter .............................................................................. 37 Table 4D Doses from Liquid Effluents - 4th Quarter .............................................................................. 37 Table 4E Total Dose from I131 Water Ingestion .................................................................................. 38 Table 4F Total Dose from Groundwater ................................................................................................ 38 Table 5 Total Dose from Fuel Cycle ......................................................................................................... 39 VI. Meteorological Data ....................................................................................................................... 40 Table 6A 1st Quarter JFD Ground Level Releases .................................................................................. 40 Table 6B 2nd Quarter JFD Ground Level Releases ................................................................................. 48 Table 6C 3rd Quarter JFD Ground Level Releases .................................................................................. 56 Table 6D 4th Quarter JFD Ground Level Releases ................................................................................. 64 Table 7A 1st Quarter JFD Split Level Releases ....................................................................................... 72 Table 7B 2nd Quarter JFD Split Level Releases ...................................................................................... 87 Table 7C 3rd Quarter JFD Split Level Releases ..................................................................................... 102 Table 7D 4th Quarter JFD Split Level Releases ..................................................................................... 117 Table 8A 1st Quarter JFD Elevated Releases........................................................................................ 132 Table 8B 2nd Quarter JFD Elevated Releases ....................................................................................... 140 Table 8C 3rd Quarter JFD Elevated Releases ....................................................................................... 148 Table 8D 4th Quarter JFD Elevated Releases ....................................................................................... 156 Page 3 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report I. Supplemental Information A. Regulatory Limits

1. Gaseous Effluents Fission and Activation Gases The release of fission and activation gases is regulated by the dose limits of Title 10 of the Code of Federal Regulations (10 CFR) 50 Appendix I and Browns Ferry Nuclear Plant (BFN) Offsite Dose Calculation Manual (ODCM). The air dose to areas at and beyond the site boundary due to noble gases released in gaseous effluents per unit shall be limited during any calendar quarter to 5 millirad (mrad) for gamma radiation and 10 mrad for beta radiation; and during any calendar year to 10 mrad for gamma radiation and 20 mrad for beta radiation.

Iodines and Particulates with HalfLives Greater than Eight Days The release of iodines and particulates in gaseous effluent is regulated by the dose limits of 10 CFR 50 Appendix I and the BFN ODCM. The dose to a member of the public from radioiodines, radioactive materials in particulate form, and radionuclides other than noble gases with halflives greater than eight days in gaseous effluent released per unit to areas at and beyond the site boundary shall be limited to any organ during any calendar quarter to 7.5 millirem (mrem), and during any calendar year to 15 mrem.

2. Liquid Effluents The release of radioactive liquid effluents is regulated by the dose limits of 10 CFR 50 Appendix I and the BFN ODCM. The doses or dose commitment to a member of the public from radioactive materials in liquid effluents released from each unit to unrestricted areas shall be limited during any calendar quarter to 1.5 mrem to the total body and 5 mrem to any organ and during any calendar year to 3 mrem to the total body and 10 mrem to any organ.

B. Limitation on Dose Rate

1. Gaseous Effluents Fission and Activation Gases The instantaneous release rate of fission and activation gases is based on the dose rate limits of 10 CFR 20.1301 and the BFN ODCM. The dose rate at any time to areas at and beyond the site boundary due to noble gases released in gaseous effluents from the site shall be limited to 500 mrem per year to the total body and 3000 mrem per year to the skin.

The BFN ODCM Section 7.2 determines the maximum noble gas release rate.

Iodines and Particulates with HalfLives Greater than Eight Days The instantaneous release rate of particulates and iodines is regulated by the dose rate limits of the BFN ODCM. The dose rate at any time to areas at and beyond the site boundary, due to I131, I133, H3, and particulates with halflives greater than eight days Page 4 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report in gaseous effluent released from the site, shall be limited to 1500 mrem per year to any organ. The BFN ODCM Section 7.3 determines the maximum particulate and iodine dose rates.

2. Liquid Effluents The concentration of radionuclides in liquid effluents released at any time from the site to unrestricted areas shall be limited to the concentrations specified in 10 CFR 20.100120.2402, Appendix B, Table 2, Column 2 for radionuclides other than dissolved or entrained noble gases.

For dissolved or entrained noble gases, the concentration shall be limited to 2E4 Ci per milliliter (ml) total activity.

C. Average Energy The BFN ODCM limits the dose equivalent rates due to the release of noble gases to less than or equal to 500 mrem/year to the total body and less than or equal to 3000 mrem/year to the skin. The use of dose rate is in accordance with NUREG0133, "Preparation of Radiological Effluent Technical Specifications for Nuclear Power Plants."

Since the release rate is not used for effluent control, the average beta and gamma energies (E) for gaseous effluents discussed in Regulatory Guide 1.21, "Measuring, Evaluation, and Reporting Radioactivity in Solid Wastes and Releases of Radioactive Materials in Liquid and Gaseous Effluents from LightWaterCooled Nuclear Power Plants," are not applicable and not included in this report.

D. Measurements & Approximations of Total Radioactivity Radioactivity measurements performed in support of the Browns Ferry Nuclear Plant ODCM meet the Lower Limit of Detection (LLD) requirements given in ODCM Tables 2.21 and 2.22.

1. Gaseous Effluents Noble gases in the building vent and stack (elevated) gaseous effluents are continuously monitored. The flow rate of the stack is continuously monitored and the building vent effluent flow rates are calculated once a shift based on the configuration of operating exhaust fans. The vent flow is calculated for each release. Gas grab samples of the stack are taken and analyzed weekly. Gas grab samples of inservice vents are taken and analyzed monthly. The specific noble gas activity concentrations and total volume of the gases are used to calculate the total Curies (Ci) of noble gases released.

In 2019, Browns Ferry revised noble gas sampling and analysis procedures which included sampling with a larger volume (1240 cc gas Marinelli) and analyzing for a longer count time (1000 seconds). Since this revision, the site has detected low levels of noble gases in the stack vent, which is expected.

The tritium concentration is determined by the analysis of a monthly grab sample for each release point.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Iodines and particulates are continuously sampled on impregnated charcoal filters and particulate filters, respectively. The charcoal and particulate samples are replaced at least weekly and analyzed to determine specific activity concentrations. The specific activity concentrations and vent flow rate data are used weekly to verify that release rate limits were not exceeded. The specific activity concentrations and total volume of gaseous effluent are used on a monthly basis to determine the total curies of each particulate and iodine released during the month.

The gross alpha concentration is determined by analysis of a monthly particulate filter composite sample, and strontium89 and strontium90 are determined by analysis of a quarterly particulate filter composite sample for each release point.

Carbon14 (C14) production and gaseous waste effluent activity source term estimates were based on methodology provided in EPRI 1021106 Estimation of Carbon 14 in Nuclear Power Plant Gaseous Effluents (December 2010). C14 gaseous activity and dose calculations are made using the following assumptions: (1) continuous release of the estimated C14 generated for each unit during power operation based on the number of Effective Fuel Power Days (EFPD) for the period, (2) maximum C14 activity from literature values cited in EPRI Report 1021106, and (3) typical fraction as carbon dioxide for gaseous releases from literature values also cited in EPRI Report 1021106.

In 2019, Browns Ferry updated C14 production rate estimates utilizing the proxy methodology provided in EPRI Report 1021106. TVA documented this update in Updated Carbon14 Production Rate Estimates for Gaseous Releases at TVA NPG Sites (October 2019). The C14 releases increased in 2019 due to all three units completing Extended Power Uprate (EPU). The EPU for each unit increased the units MWth (Megawatt thermal) from 3,458 to 3,952 MWth. This increase in MWth is used in the calculation of C14 releases. The increase in C14 releases is expected.

2. Liquid Effluents The gamma ray emitting radionuclide concentrations are determined for each batch by gamma ray spectroscopy analysis of a grab sample. The allowable release rate is calculated for each batch based upon the known dilution flow. The flow rate of the liquid effluent is continuously monitored and the total volume released in each batch is determined. The total gamma activity released in each batch is determined by multiplying the radionuclide concentrations by the total volume discharged. The total gamma activity released during the month is then determined by summing the gamma activity content of each batch discharged during the month.

The gross alpha and tritium concentrations are measured on a monthly composite sample. The strontium89, strontium90, and iron55 are measured on a quarterly composite sample.

The Radioactive Gaseous and Liquid Waste Monitoring Sampling and Analysis Program is specified in ODCM Sections 1/2.2.1 and 1/2.2.2. There were no liquid or gaseous concentrations or dose limits exceeded in the 2020 reporting period.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report E. Batch Releases

1. Gaseous 1st 2nd 3rd 4th Units Total Quarter Quarter Quarter Quarter
1. Gaseous
1. Number of Batch Each 1 3 1 1 6 Releases
2. Total duration of minutes 4.80E+01 1.44E+02 4.80E+01 4.80E+01 2.88E+02 batch releases
3. Maximum batch minutes 4.80E+01 4.80E+01 4.80E+01 4.80E+01 4.80E+01 release duration
4. Average batch minutes 4.80E+01 4.80E+01 4.80E+01 4.80E+01 4.80E+01 release duration
5. Minimum batch minutes 4.80E+01 4.80E+01 4.80E+01 4.80E+01 4.80E+01 release duration
2. Liquid 1st 2nd 3rd 4th Units Total Quarter Quarter Quarter Quarter
2. Liquids
1. Number of Batch Each 14 25 9 24 72 Releases
2. Total duration of minutes 4.37E+03 6.32E+03 2.81E+03 7.55E+02 2.10E+04 batch releases
3. Maximum batch minutes 4.20E+02 4.15E+02 4.25E+02 5.85E+02 5.85E+02 release duration
4. Average batch minutes 3.12E+02 2.53E+02 3.12E+02 3.14E+02 2.92E+02 release duration
5. Minimum batch minutes 1.00E+00 2.20E+02 2.55E+02 2.15E+02 1.00E+00 release duration
6. Avg. stream flow during periods of release of liquid CFS 1.40E+05 6.81E+04 2.95E+04 5.79E+04 NA effluent into a flowing stream Page 7 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report F. Abnormal Releases

1. Gaseous Abnormal gaseous tritium releases occurred 2020 from the Auxiliary Boiler System when the boilers were in service for unit outages and winter months. The identified source of tritium to the auxiliary boiler system is main steam leakby from degraded Steam Jet Air Ejector (SJAE) /

Auxiliary Boiler valves to the auxiliary boiler header (CR 1508177). Beginning in 2022, these valves will be replaced during each units respective outage.

1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Gaseous
1. Number of Each 1 1 0 1 3 abnormal Releases
2. Total Activity for Ci 8.89E02 3.54E02 0.0E+00 3.61E01 4.85E01 abnormal releases I I
2. Liquid Abnormal liquid tritium releases occurred throughout 2020 from the Unit 1 and Unit 2 Station Sumps. Plant station sumps are autopumped to unit specific Condenser Circulating Water (CCW) discharge and subsequently to the Tennessee River. Identified sources include: main steam leakby from degraded SJAE / Auxiliary boiler system valves to Unit 1 Station Sump, Vacuum Priming system and multiple steam leaks in the SJAE and Offgas Recombiner rooms.

1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter 2.Liquid

1. Number of Each 2 2 2 2 8 abnormal Releases
2. Total Activity for I I Ci 4.96E01 1.20E+00 4.74E01 5.44E01 2.72E+00 abnormal releases Page 8 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report G. Nonroutine, Planned Discharges In calendar year 2020 there were no nonroutine planned discharges.

H. Radioactive Waste System Treatment Changes In calendar year 2020 Radwaste Train B of the AvanTech System was placed in service.

There were no changes to the Process Control Program (PCP).

I. Land Use Census Changes In calendar year 2020 there were no changes to the land use census.

J. Effluent Monitoring Instrument Inoperability > 30 Days In calendar year 2020 there was one radwaste liquid flow indicator and two gaseous effluent monitors inoperable for greater than 30 days.

1. The Liquid Radwaste Discharge Flow Indicator, 0FIC770060, was declared inoperable 10/25/2019 during performance of 0SI4.8.A.11 due to the average flowrate being outside the acceptance criteria of 8%. The 0FIC0770060 was returned to service 2/18/2021. (CR 1560354, CR 1568432, LCOTR# 0077ODCM20190001).
2. Gaseous effluent continuous radiation monitor, 3RM90250, was declared inoperable 1/25/2020 due to sample pump abnormal alarm. The radiation monitor was returned to service 2/26/2020. The radiation monitor was inoperable for this duration due to awaiting a new sample pump. (CR 1581730, CR 1590022, WO 121064413, LCOTR# 3090ODCM20200018).
3. Gaseous effluent continuous radiation monitor, 2RM90249, was declared inoperable 11/2/2020 due to communication channel failure. The radiation monitor was returned to service 1/29/2021. Due to requiring a replacement CPU and monitor computers are obsolete, Design Change BFN201914 was implemented (CR 1649408, CR 1660950, WO 121735665, LCOTR# 2090ODCM20200054).

K. Effluent Monitoring Equipment Sample Deviation In calendar year 2020 there were no effluent monitoring equipment sample deviations.

L. Offsite Dose Calculation Manual Changes In calendar year 2020 there were no changes to the Offsite Dose Calculation Manual.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report M. Groundwater Monitoring and Program (NEI 0707)

In 2007, the Nuclear Energy Institute (NEI) established the Groundwater Protection Initiative (GPI), NEI 0707. The Groundwater Protection Initiative was established to 1) improve management of situations involving inadvertent radiological releases that get into groundwater and 2) to improve communication with external stakeholders to enhance trust and confidence on the part of local communities, States, the NRC, and the public in the nuclear industrys commitment to a high standard of public radiation safety and protection of the environment. This section provides information and sample results from onsite groundwater locations that were sampled in support of the Groundwater Protection Initiative at Browns Ferry Nuclear Plant. The groundwater wells described in this section are not part of the Radiological Environmental Monitoring Program (REMP).

In the early 2000s, BFN initiated a groundwater study to identify the source of low level tritium detected onsite. Results from the groundwater study (Investigation of Tritium Releases to Groundwater, 2006), suggest the source of tritiated groundwater was from historical leaks and spills associated with Radwaste/Condensate transfer tunnel.

Groundwater and surface water level measurements during the study indicated the return channel and subsequently the Tennessee River will ultimately be recipient to tritiated groundwater discharge from the site. It has been determined that there are no groundwater wells onsite or within 2miles of the site that are used as a source of drinking water.

Groundwater movement in the area has been determined to be from the plant site toward the Tennessee River.

Onsite groundwater monitoring was performed in 2020. The purpose of onsite groundwater monitoring is to ensure timely detection of inadvertent radiological releases to groundwater. NonREMP groundwater wells monitor for potential leaks from plant equipment. As part of the GPI, BFN monitored a total of 30 groundwater wells located in the protected area and the owner controlled area during 2020. Normal sampling frequencies are quarterly and semiannually with some wells sampled monthly if certain criteria are met or for investigation purposes. Samples are routinely analyzed for environmental level tritium (H3) and principle gamma emitters (PGE) with selected wells analyzed for HardtoDetect (HTD) radionuclides (Gross Alpha, Fe55, Ni63, Sr89, and Sr90). In support of the groundwater program, the site also monitors recapture and onsite storm drains, catch basins and surface water.

In 2020, low levels of tritium were detected in onsite groundwater wells as indicated in Table 9, Groundwater Data. Table 9 demonstrates all onsite groundwater wells that indicated detectable tritium concentrations. Tritium concentrations in 2020 ranged from nondetectable, less than 163 pCi/L, up to a maximum concentration of 35,400 pCi/L (DewatA). BFN has been monitoring a legacy tritium plume in the vicinity of groundwater well DewatA located adjacent to the reactor building. This plume is the result of previous leaks in past years (2015 and 2016). No other plant related radionuclides were detected in any groundwater well. There were no instances of any onsite spills or leaks that occurred during 2020 reporting period that were communicated to offsite agencies or that met the criteria in NEI 0707, Appendix A.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 9 Groundwater Data Tritium Sample Date Well ID (pCi/L) 1st Quarter 2020 2/7/2020 DewatA 35400 3/5/2020 DewatA 34400 2/6/2020 MW01 2260 2/5/2020 MW02 1430 2/4/2020 MW02i 4160 3/5/2020 MW02i 2800 2/6/2020 MW03 579 2/4/2020 MW04 1260 2/6/2020 MW07 1170 2/6/2020 MW08 3150 2/5/2020 MW8i 559 2/4/2020 MW15 257 2/4/2020 MW18 1360 2/5/2020 MW19 1050 nd 2 Quarter 2020 4/2/2020 DewatA 11800 5/7/2020 DewatA 5290 6/2/2020 DewatA 3110 5/7/2020 MW01 1390 5/8/2020 MW02 1500 4/2/2020 MW02i 519 5/8/2020 MW02i 1110 5/7/2020 MW03 685 5/6/2020 MW04 457 5/7/2020 MW07 2300 5/7/2020 MW08 7480 6/2/2020 MW08 1650 5/7/2020 MW8i 523 5/6/2020 MW19 1000 Page 11 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 9 Groundwater Data Tritium Sample Date Well ID (pCi/L) 3rd Quarter 2020 8/5/2020 DewatA 3030 8/5/2020 MW01 965 8/5/2020 MW02 1190 8/5/2020 MW02i 321 8/5/2020 MW03 899 8/4/2020 MW04 221 8/4/2020 MW07 2390 8/5/2020 MW08 1130 8/5/2020 MW8i 494 8/4/2020 MW19 866 th 4 Quarter 2020 11/16/2020 DewatA 3050 12/14/2020 DewatA 5010 11/19/2020 MW01 2200 11/19/2020 MW02 1090 11/19/2020 MW03 755 11/19/2020 MW04 266 11/19/2020 MW07 2450 10/22/2020 MW08 891 11/19/2020 MW08 787 12/14/2020 MW08 643 11/19/2020 MW8i 500 12/14/2020 MW08i 2190 11/18/2020 MW11 299 11/19/2020 MW19 910 N. Errata/Corrections to Previous ARERRs There are no errata/corrections made to previous ARERRs.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report II. Gaseous Effluents Table 1A Gaseous Effluents Summation of all Releases Units 1st 2nd 3rd 4th Est. Total Total Quarter Quarter Quarter Quarter Error A. Fission and Activation Gases

1. Total Release Ci 5.51E+01 1.17E+01 7.51E+00 2.35E+00 7.66E+01
2. Average Release Rate for Period uCi/sec 7.00E+00 1.48E+00 9.45E01 2.95E01 2.42E+00 +/- 45%
3. Percent of Tech Spec Limit  % * * * *
1. Total Release Ci 5.90E04 4.74E04 1.17E03 4.21E04 2.66E03
2. Average Release Rate for Period uCi/sec 7.50E05 6.03E05 1.48E04 5.29E05 8.41E05 +/- 36%
3. Percent of Tech Spec Limit  % * * * *
  • C. Particulates
1. Total Release Ci 5.22E04 6.76E04 4.14E04 5.26E04 2.14E03
2. Average Release Rate for Period uCi/sec 6.63E05 8.60E05 5.21E05 6.62E05 6.76E05 +/- 35%
3. Percent of Tech Spec Limit  % * * * *
  • D. Tritium1
1. Total Release Ci 1.62E+02 1.23E+02 1.04E+02 9.35E+01 4.83E+02
2. Average Release Rate for Period uCi/sec 2.06E+01 1.57E+01 1.31E+01 1.18E+01 1.53E+01 +/- 21%
3. Percent of Tech Spec Limit  % * * * *
  • E. Gross Alpha
1. Total Release Ci <LLD <LLD <LLD <LLD <LLD
2. Average Release Rate for Period uCi/sec <LLD <LLD <LLD <LLD <LLD NA
3. Percent of Tech Spec Limit  % * * * *
  • F. Carbon14
1. Total CO2 Release Ci 1.20E+01 1.30E+01 1.28E+01 1.20E+01 4.98E+01
2. Total Carbon Release Ci 1.27E+01 1.36E+01 1.35E+01 1.27E+01 5.25E+01 NA
3. Percent of Tech Spec Limit  % * * * *
  • 1 Includes activity from abnormal releases. Dilution flow was not determined for all abnormal releases.
  • Applicable Limits are expressed in terms of dose. Reference Section V, Radiological Impact.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1B Gaseous Effluents - Ground Level Releases (Batch) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr85m Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci <LLD <LLD <LLD <LLD <LLD Kr88 Ci <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
2. Iodines I131 Ci <LLD <LLD <LLD <LLD <LLD I133 Ci <LLD <LLD <LLD <LLD <LLD I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I <LLD <LLD <LLD <LLD <LLD Na24 Ci <LLD <LLD <LLD <LLD <LLD Mn54 Ci <LLD <LLD <LLD <LLD <LLD Co58 Ci <LLD <LLD <LLD <LLD <LLD Co60 Ci <LLD <LLD <LLD <LLD <LLD Zn65 Ci <LLD <LLD <LLD <LLD <LLD Sr89 Ci <LLD <LLD <LLD <LLD <LLD Sr90 Ci <LLD <LLD <LLD <LLD <LLD Ag110m Ci <LLD <LLD <LLD <LLD <LLD Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD <LLD <LLD La140 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci <LLD <LLD <LLD <LLD <LLD
6. Carbon14 C14 Ci <LLD <LLD <LLD <LLD <LLD Page 14 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1B Gaseous Effluents - Ground Level Releases (Continuous) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr85m Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci <LLD <LLD <LLD <LLD <LLD Kr88 Ci <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
2. Iodines I131 Ci 4.20E05 3.28E06 1.55E06 2.07E06 4.89E05 I133 Ci 4.00E05 <LLD <LLD <LLD 4.00E05 I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I 8.21E05 3.28E06 1.55E06 2.07E06 8.90E05 Na24 Ci <LLD <LLD <LLD <LLD <LLD Mn54 Ci <LLD 4.77E06 <LLD <LLD 4.77E06 Co58 Ci <LLD 2.47E06 <LLD <LLD 2.47E06 Co60 Ci <LLD 2.12E05 1.56E05 1.70E06 3.86E05 Zn65 Ci <LLD <LLD <LLD <LLD <LLD Sr89 Ci <LLD <LLD <LLD <LLD <LLD Sr90 Ci <LLD <LLD <LLD <LLD <LLD Nb95 Ci <LLD 1.99E06 <LLD <LLD 1.99E06 Ag110m Ci <LLD <LLD <LLD <LLD <LLD Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD <LLD <LLD La140 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD 3.05E05 1.56E05 1.70E06 4.789E05
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci 4.49E+01 3.03E+01 2.06E+01 3.06E+01 1.26E+02
6. Carbon14 C14 Ci <LLD <LLD <LLD <LLD <LLD Page 15 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1C Gaseous Effluents - Elevated Releases (Batch) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr85m Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci <LLD <LLD <LLD <LLD <LLD Kr88 Ci <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
2. Iodines I131 Ci <LLD <LLD <LLD <LLD <LLD I133 Ci <LLD <LLD <LLD <LLD <LLD I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I <LLD <LLD <LLD <LLD <LLD Na24 Ci <LLD <LLD <LLD <LLD <LLD Mn54 Ci <LLD <LLD <LLD <LLD <LLD Co58 Ci <LLD <LLD <LLD <LLD <LLD Co60 Ci <LLD <LLD <LLD <LLD <LLD Zn65 Ci <LLD <LLD <LLD <LLD <LLD Sr89 Ci <LLD <LLD <LLD <LLD <LLD Sr90 Ci <LLD <LLD <LLD <LLD <LLD Ag110m Ci <LLD <LLD <LLD <LLD <LLD Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD <LLD <LLD La140 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci <LLD 3.78E03 <LLD <LLD 3.78E03
6. Carbon14 C14 Ci <LLD <LLD <LLD <LLD <LLD Page 16 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1C Gaseous Effluents - Elevated Releases (Continuous) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Ar41 Ci 1.44E+01 7.38E+00 4.51E+00 2.35E+00 2.86E+01 Kr85m Ci 2.75E+00 <LLD <LLD <LLD 2.75E+00 Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci 6.15E+00 1.21E+00 3.64E01 <LLD 7.72E+00 Kr88 Ci 1.99E+01 2.42E+00 2.17E+00 <LLD 2.44E+01 Xe133 Ci 1.14E+01 1.95E01 <LLD <LLD 1.16E+01 Xe135 Ci 5.91E01 4.57E01 4.68E01 <LLD 1.52E+00 Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci 5.51E+01 1.17E+01 7.51E+00 2.35E+00 7.66E+01
2. Iodines I131 Ci 1.65E04 9.59E05 1.62E04 4.70E05 4.70E04 I133 Ci 2.61E04 2.64E04 4.78E04 8.54E05 1.09E03 I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I 4.25E04 3.60E04 6.41E04 1.32E04 1.56E03 Na24 Ci <LLD <LLD <LLD <LLD <LLD Mn54 Ci <LLD <LLD <LLD <LLD <LLD Co58 Ci <LLD <LLD <LLD <LLD <LLD Co60 Ci <LLD <LLD 4.07E06 <LLD 4.07E06 Zn65 Ci <LLD <LLD <LLD <LLD <LLD Sr89 Ci 1.29E05 6.09E06 9.89E06 1.20E05 4.09E05 Sr90 Ci <LLD <LLD <LLD <LLD <LLD Ag110m Ci <LLD <LLD <LLD <LLD <LLD Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD 5.22E06 5.22E06 La140 Ci <LLD <LLD <LLD 1.21E05 1.21E05 Au199 Ci 2.30E04 1.09E04 1.52E04 2.84E04 7.75E04 Total For Period Ci 2.43E04 1.15E04 1.66E04 3.14E04 8.37E04
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci 3.98E+01 1.64E+01 1.08E+01 8.07E+00 7.50E+01
6. Carbon14 C14 Ci 1.20E+01 1.30E+01 1.28E+01 1.20E+01 4.98E+01 Page 17 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1D Gaseous Effluents - Mixed Mode Releases (Batch) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr85m Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci <LLD <LLD <LLD <LLD <LLD Kr88 Ci <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
2. Iodines I131 Ci <LLD <LLD <LLD <LLD <LLD I133 Ci <LLD <LLD <LLD <LLD <LLD I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I <LLD <LLD <LLD <LLD <LLD Na24 Ci <LLD <LLD <LLD <LLD <LLD Mn54 Ci <LLD <LLD <LLD <LLD <LLD Co58 Ci <LLD <LLD <LLD <LLD <LLD Co60 Ci <LLD <LLD <LLD <LLD <LLD Zn65 Ci <LLD <LLD <LLD <LLD <LLD Sr89 Ci <LLD <LLD <LLD <LLD <LLD Sr90 Ci <LLD <LLD <LLD <LLD <LLD Ag110m Ci <LLD <LLD <LLD <LLD <LLD Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD <LLD <LLD La140 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci 2.19E03 5.75E03 2.85E03 2.23E03 1.30E02
6. Carbon14 C14 Ci <LLD <LLD <LLD <LLD <LLD Page 18 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 1D Gaseous Effluents - Mixed Mode Releases (Continuous) 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Gases Kr85 Ci <LLD <LLD <LLD <LLD <LLD Kr85m Ci <LLD <LLD <LLD <LLD <LLD Kr87 Ci <LLD <LLD <LLD <LLD <LLD Kr88 Ci <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135m Ci <LLD <LLD <LLD <LLD <LLD Xe138 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci <LLD <LLD <LLD <LLD <LLD
2. Iodines I131 Ci 6.38E05 2.35E06 9.49E05 5.07E05 2.12E04 I133 Ci 1.88E05 1.09E04 4.37E04 2.35E04 8.00E04 I135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period
3. Particulates I Ci I 8.26E05 1.11E04 5.32E04 2.86E04 1.01E03 Na24 Ci <LLD <LLD <LLD <LLD <LLD Cr51 Ci 1.23E04 4.46E05 <LLD 2.33E05 1.91E04 Mn54 Ci 3.88E06 5.71E06 6.12E06 6.04E06 2.18E05 Co58 Ci 5.09E06 2.41E06 <LLD 2.90E06 1.04E05 Co60 Ci 1.13E04 1.18E04 7.87E05 9.07E05 4.00E04 Zn65 Ci <LLD <LLD <LLD 2.05E06 2.05E06 Se75 Ci 7.42E07 1.55E06 <LLD 4.91E06 7.20E06 As76 Ci <LLD 3.31E04 1.47E04 5.91E05 5.37E04 Sr89 Ci <LLD <LLD <LLD <LLD <LLD Sr90 Ci <LLD <LLD <LLD <LLD <LLD Nb95 Ci <LLD 3.83E06 <LLD <LLD 3.83E06 Ag110m Ci 3.23E05 2.44E05 3.99E07 2.16E05 7.87E05 Cs134 Ci <LLD <LLD <LLD <LLD <LLD Cs137 Ci <LLD <LLD <LLD <LLD <LLD Ba140 Ci <LLD <LLD <LLD <LLD <LLD La140 Ci <LLD <LLD <LLD <LLD <LLD Total For Period Ci 2.78E04 5.31E04 2.32E04 2.11E04 1.25E03
4. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD <LLD
5. Tritium H3 Ci 7.71E+01 7.67E+01 7.28E+01 5.48E+01 2.81E+02
6. Carbon14 C14 Ci <LLD <LLD <LLD <LLD <LLD Page 19 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report III. Liquid Effluents Table 2A Liquid Effluents Summation of all Releases 1st 2nd 3rd 4th Est. Total Units Total Quarter Quarter Quarter Quarter Error A. Fission and Activation Products

1. Total Release Ci 1.08E02 5.63E03 1.00E02 9.93E03 3.63E02
2. Average Diluted Concentration uCi/mL 1.08E09 2.67E10 1.76E09 3.96E10 8.76E10 +/- 9%
3. Percent of Tech Spec Limit  % * * * *
1. Total Release Ci 1.66E+01 1.43E+01 5.05E+00 1.23E+01 4.83E+01
2. Average Diluted Concentration uCi/mL 1.67E06 6.68E07 8.92E07 4.91E07 9.30E07 +/- 6%
3. Percent of Tech Spec Limit  % * * * *
  • C. Dissolved and Entrained Noble Gases
1. Total Release Ci 9.77E05 4.40E06 2.32E05 3.16E05 1.57E04
2. Average Diluted Concentration uCi/mL 9.83E12 2.09E13 4.09E12 1.26E12 3.85E12 +/- 8%
3. Percent of Tech Spec Limit  % * * * *
  • D. Gross Alpha Radioactivity
1. Total Release Ci <LLD <LLD <LLD <LLD <LLD
2. Average Release Rate for Period uCi/mL <LLD <LLD <LLD <LLD <LLD +/- 48%
3. Percent of Tech Spec Limit  % * * * *
  • E. Volume of Liquid Waste to Liters 1.29E+06 1.44E+06 7.42E+05 1.93E+06 5.41E+06 +/- 3%

Discharge Canal (prior to dilution)

F. Volume of Dilution Water for Liters 9.94E+09 2.11E+10 5.67E+09 2.51E+10 6.18E+10 +/- 10%

Period G. Total CCW Gigagal 2.14E+02 2.61E+02 2.72E+02 2.52E+02 9.99E+02 NA 1

Includes activity from abnormal releases. Dilution flow was not determined for all abnormal releases.

  • Applicable Limits are expressed in terms of dose. Reference Section V, Radiological Impact.

Page 20 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Table 2B Liquid Effluents - Batch Mode 1st 2nd 3rd 4th Units Total Quarter Quarter Quarter Quarter

1. Fission and Activation Products F18 Ci 1.16E05 3.64E06 1.20E05 <LLD 2.72E05 Na24 Ci 2.18E05 <LLD <LLD <LLD 2.18E05 Cr51 Ci 7.76E05 <LLD <LLD <LLD 7.76E05 Mn54 Ci 1.07E03 6.98E04 1.32E03 1.16E03 4.25E03 Fe55 Ci 1.14E03 4.83E05 1.08E03 <LLD 2.27E03 Co58 Ci 5.49E04 6.12E05 1.30E04 3.43E04 1.08E03 Co60 Ci 5.99E03 3.89E03 6.03E03 5.20E03 2.11E02 Zn65 Ci 1.15E03 6.96E04 3.96E04 1.13E03 3.38E03 Sr89 Ci <LLD <LLD 1.01E04 2.26E04 3.27E04 Sr90 Ci <LLD <LLD 3.57E05 <LLD 3.57E05 Sr92 Ci <LLD 5.39E06 1.05E05 8.85E06 2.48E05 Nb97 Ci 7.49E06 4.81E05 3.79E05 4.82E05 1.42E04 Ag110m Ci 5.48E04 <LLD 1.94E04 6.36E04 1.38E03 Cs137 Ci 1.89E04 1.72E04 6.50E04 1.18E03 2.19E03 La140 Ci <LLD <LLD 6.68E06 <LLD 6.68E06 Total For Period Ci 1.08E02 5.63E03 1.00E02 9.93E03 3.63E02
2. Dissolved and Entrained Gases Xe133 Ci 6.41E05 <LLD 1.82E05 5.02E06 8.73E05 Xe135 Ci 3.36E05 4.40E06 5.02E06 2.66E05 6.96E05 Total For Period I Ci I 9.77E05 4.40E06 2.32E05 3.16E05 1.57E04 Table 2B Liquid Effluents - Continuous Mode 1st 2nd 3rd 4th I I Units Total Quarter Quarter Quarter Quarter
1. Fission and Activation Products Co58 Ci <LLD <LLD <LLD <LLD <LLD Co60 Ci <LLD <LLD <LLD <LLD <LLD Total For Period I Ci
2. Dissolved and Entrained Gases I <LLD <LLD <LLD <LLD <LLD Xe133 Ci <LLD <LLD <LLD <LLD <LLD Xe135 Ci <LLD <LLD <LLD <LLD <LLD Total For Period I Ci I <LLD <LLD <LLD <LLD <LLD Page 21 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report IV. Solid Waste Storage and Shipment A. Solid Waste Shipped Offsite for Burial or Disposal (Not Irradiated Fuel)

1. Type of Waste Units JanJun JulDec Error
a. Spent resins, filters, filter sludge m3 1.89E+02 9.90E+01 +/- 25%

evaporator bottoms, etc. Ci 2.25E+02 4.68E+01 +/- 25%

b. Dry compressible waste, contaminated m3 1.31E+03 9.51E+02 +/- 25%

equipment, etc. Ci 7.31E+00 3.34E+00 +/- 25%

c. Irradiated components, control rod m3 0.00E+00 0.00E+00 +/- 25%

blades & LPRMs with fission chambers Ci 0.00E+00 0.00E+00 +/- 25%

d. Other - Combined Packages m3 0.00E+00 0.00E+00 +/- 25%

Ci 0.00E+00 0.00E+00 +/- 25%

Page 22 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report

2. Estimate of major nuclide composition (by type of waste)
a. Spent resins, filters, filter sludge evaporator bottoms, etc.

Nuclide Percentage Curies

1. H3 0.81% 2.20E+00
2. C14 0.16% 4.34E01
3. Cr51 0.01% 3.76E02
4. Mn54 7.11% 1.94E+01
5. Fe55 18.07% 4.93E+01
6. Co57 0.01% 3.58E02
7. Co58 4.47% 1.22E+01
8. Co60 46.62% 1.27E+02
9. Ni59 0% 4.66E04
10. Ni63 1% 2.73E+00
11. Zn65 6.24% 1.70E+01
12. Sr89 0.05% 1.30E01
13. Sr90 0.03% 6.91E02
14. Tc99 0.02% 4.09E02
15. Ag110m 4.58% 1.25E+01
16. Sb124 0.08% 2.11E01
17. Cs134 0.04% 1.12E01
18. Cs137 10.65% 2.90E+01
19. Ce144 0.06% 1.70E01
20. Pu238 0% 1.46E06
21. Pu241 0% 3.59E05
22. Am241 0% 3.36E04
23. Cm242 0% 1.18E07
24. Cm243 0% 2.72E07 Page 23 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report

2. Estimate of major nuclide composition (continued)
b. Dry compressible waste, contaminated equipment, etc.

Nuclide Percentage Curies

1. H3 6.74% 7.18E01
2. Cr51 0.85% 9.05E02
3. Mn54 3.52% 3.75E01
4. Fe55 29.61% 3.16E+00
5. Co57 0% 2.93E04
6. Co58 1.77% 1.89E01
7. Co60 43.99% 4.69E+00
8. Ni63 1.33% 1.41E01
9. Zn65 2.55% 2.71E01
10. Sr90 0.02% 1.93E03
11. Zr95 0.06% 6.06E03
12. Nb95 0.51% 5.45E02
13. Tc99 0.01% 1.00E03
14. Ag110m 2.63% 2.81E01
15. Sb124 0.02% 2.57E03
16. Sb125 0.34% 3.66E02
17. Cs134 0.03% 3.60E03
18. Cs137 6.01% 6.41E01
c. Irradiated components, control rod blades & LPRMs with fission chambers Nuclide Percentage Curies 0 0 0
d. Other (combined packages)

Nuclide Percentage Curies 0 0 0 Page 24 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report

3. Sold Waste Disposition Number of Mode of Transportation Destination Shipments TOXCO, Inc.

3 ESS (TVA)

Materials Management Center Energy Solutions LLC. (Clive) 14 Hittman Transport Services Clive Disposal Site Containerized Waste Facility Energy Solutions Services Inc.

7 Hittman Transport Services 1560 Bear Creek Road Waste Control Specialist, LLC 1 Hittman Transport Services CWF WCS TSD Facility 1 Hittman Transport Services TSD Facility TOXCO, Inc.

2 Interstate Ventures, Inc.

Materials Management Center Waste Control Specialist, LLC 32 Interstate Ventures, Inc.

CWF WCS TSD Facility 8 Interstate Ventures, Inc.

TSD Facility Unitech Services Group, Inc.

49 Specialty Transport, Inc.

Oak Ridge Service Center B. Irradiated Fuel Shipments (Disposition)

Number of Mode of Transportation Destination Shipments 0 NA NA Page 25 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact V. Radiological Impact to Man A. Introduction Potential doses to the "maximum exposed individual" and the population around Browns Ferry Nuclear Plant (BFN) are calculated for each quarter as required in Section 5.2 of the Offsite Dose Calculation Manual (ODCM). The methodology used to estimate dose for determining plant releases for the reporting period is specified in Sections 6 and 7 of the ODCM. Dispersion of radioactive effluents in the environment is estimated using meteorological data and river flow measured during the period. In this report, the doses resulting from releases are described and compared to limits established for BFN.

B. Dose Limits The ODCM specifies limits for the release of radioactive effluents, as well as limits for doses to the general public from the release of radioactive effluents. These limits are set well below the Technical Specification limits which govern the concentrations of radioactivity and doses permissible in unrestricted areas. This ensures that radioactive effluent releases are As Low As Reasonably Achievable.

The air dose limits in areas at and beyond the Site Boundary due to noble gases released in gaseous effluents per unit are:

5 mrad per quarter and 10 mrad per year for gamma radiation.

and 10 mrad per quarter and 20 mrad per year for beta radiation.

The dose limits to a member of the public in an unrestricted area from radioiodines, radioactive materials in particulate form, and radionuclides other than noble gases with half lives > 8 days released in gaseous effluents for each unit are:

7.5 mrem per quarter and 15 mrem per year to any organ.

The dose or dose commitment to a member of the public from radioactive material in liquid effluents released to unrestricted areas are:

1.5 mrem per quarter and 3 mrem per year to the total body, and 5 mrem per quarter and 10 mrem per year to any organ.

The limit for the total effective dose equivalent to an individual member of the public inside the site boundary is:

100 mrem per year.

Page 26 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact The Environmental Protection Agency limits for total dose to any member of the public in the vicinity of a nuclear power plant, established in the Environmental Dose Standard of 40 CFR 190, are:

25 mrem per year to the whole body, 75 mrem per year to the thyroid, and 25 mrem per year to any other organ.

C. Dose Calculations Estimated doses to members of the public are determined using computer models (the Gaseous Effluent Licensing Code, and the Quarterly Water Dose Assessment Code (QWATA)).

These models are based on guidance provided by the Nuclear Regulatory Commission (NRC) for determining the potential dose to individuals and populations living in the vicinity of the plant. The area around the plant is analyzed to determine the pathways through which the public may receive a dose. The doses calculated are a representation of the dose to a "maximum exposed individual." Some of the factors used in these calculations (such as ingestion rates) are maximum values to ensure conservative reporting of data. The values chosen will tend to overestimate the dose. The expected dose to actual individuals is lower.

The calculated doses are presented in Tables 3, 4, and 5.

D. Doses from Airborne Effluents For airborne effluents, members of the public can be exposed to radiation from several sources: direct radiation from the radioactivity in the air, direct radiation from radioactivity deposited on the ground, inhalation of airborne radioactivity, ingestion of vegetation which contains radioactivity deposited from the atmosphere, and ingestion of milk and beef which contains radioactivity deposited from the atmosphere onto vegetation and subsequently consumed by animals.

Releases from the turbine building are considered groundlevel releases. The groundlevel Joint Frequency Distribution (JFD) is derived from wind speeds and directions measured 10.5 meters above the ground and from the vertical temperature difference between 10.03 and 45.30 meters, and are presented for each quarter in Section VI, Meteorological Data, Tables 6A, 6B, 6C, and 6D.

Releases from the radwaste and reactor buildings are considered splitlevel releases.

Portions of the release are treated as groundlevel while other portions are considered elevated depending on the ratio of the vertical exit velocity to the horizontal wind speed.

The splitlevel dispersion approach is implemented using a model that requires two complete quarterly JFDs for each effluent vent, one for the groundlevel releases and one for the elevated releases. The groundlevel portion of the splitlevel JFD is based on wind speeds and directions measured 10.5 meters above groundlevel and from the vertical temperature difference between 10.03 and 45.30 meters. The elevated portion of the splitlevel JFD is based on wind speeds and direction measurements at the 45.74 meter level and the vertical Page 27 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact temperature difference between 10.03 and 89.59 meters. Both of these JFDs are given for each quarter in Section VI, Meteorological Data, Tables 7A, 7B, 7C, and 7D.

Releases from the stack are considered to be elevated releases. The JFDs for elevated releases are based on wind directions and wind speeds measured at 90.29 meters and the vertical temperature difference between 10.03 and 89.59 meters, and are given for each quarter in Section VI, Meteorological Data, Table 8A, 8B, 8C, and 8D.

Meteorological variables at BFN are measured continuously. Measurements collected include wind speed and wind direction at heights of 10.5, 45.74, and 90.29 meters above the ground, and temperature at heights of 10.03, 45.30, and 89.59 meters above the ground.

Quarterly JFDs are calculated for each release point using the appropriate levels of meteorological data. A quarterly JFD gives the percentage of the time that the wind is blowing out of a particular upwind compass sector in a particular range of wind speeds for a given stability class A through G. The wind speeds are divided into nine wind speed ranges.

Calms are distributed by direction in proportion to the distribution of noncalm wind directions less than 1.6 m/s (3.5 mph). Stability classes are determined from the vertical temperature difference between two measurement levels.

The generally open terrain around BFN does not cause any significant effects on the transport and dispersion of gaseous effluents from the plant. Within 30 kilometers of BFN, the terrain is mostly gently rolling hills (3060 meters). Between 30 and 80 kilometers, the hills become larger to the north and south and mountainous to the east and northeast. The Tennessee River/Wheeler Lake may have a minor effect on transport and dispersion in the immediate vicinity of BFN during periods of winds with a southerly component, overcast skies, and relatively high wind speeds. Also, the lower layer (1045 meters) stability class tends to be more stable. However, during this infrequent condition, dose estimates will be conservative.

Dose calculated for maximum external air dose (gammaair and betaair) are made for points at and beyond the unrestricted area boundary as described in the BFN ODCM. The highest of these doses is then selected.

External doses to the skin and total body, due to submersion in a cloud of noble gases, are calculated for the nearest residence in each sector. The residence with the highest dose is then selected from all sectors.

Dose to an organ due to releases of airborne effluents are estimated for the inhalation, ground contamination, and ingestion pathways. The ingestion pathway is further divided into three possible contributing pathways: ingestion of cow/goat milk, ingestion of beef, and ingestion of vegetables. Doses from applicable pathways are calculated for each receptor location identified in the most recent land use survey. To determine the maximum organ dose, the doses from the pathways are summed for each receptor. However, for the Page 28 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact ingestion dose, only those pathways that exist for each receptor are considered in the sum, e.g., milk ingestion doses are included only for locations where milk was consumed without commercial preparation and vegetable ingestion is included only for those locations where a garden was identified. To conservatively account for beef ingestion, a beef ingestion dose equal to that for the highest unrestricted area boundary location is added to each identified receptor. For ground contamination, the dose added to the organ dose being calculated is the total body dose calculated for that location, i.e., it is assumed that the dose to an individual organ is equal to the total body dose.

The maximum organ dose, thyroid dose, and total body dose from airborne effluents are presented in Table 3.

E. Doses from Liquid Effluents For liquid effluents, the public can be exposed to radiation from three sources: the ingestion of water from the Tennessee River, the ingestion of fish caught in the Tennessee River, and direct exposure from radioactive material deposited on the river shoreline sediment (recreation). The concentration of radionuclides in the Tennessee River is calculated by a computer model which uses measured hydraulic data downstream of BFN.

Parameters used to determine the doses are based on guidance given by the NRC for maximum ingestion rates, exposure times, etc.

Wherever possible, parameters used in the dose calculation are site specific. The models that are used to estimate doses, as well as the parameters input to the models, are described in detail in the BFN ODCM.

Radionuclide concentrations in the Tennessee River are calculated assuming that releases in liquid effluents are continuous. When necessary, liquid releases from BFN, located at Tennessee River Mile 294, are made through diffusers which extend into the Tennessee River. It is assumed that releases to the river through these diffusers will initially be entrained in onefifth of the water which flows past the plant. The QWATA code makes the assumption that this mixing condition holds true until the water is completely mixed at the first downstream dam (Wheeler Dam), at Tennessee River Mile 283.

Doses are calculated for locations within a 50 mile radius downstream of the plant site.

The maximum potential recreation dose is calculated for a location immediately downstream from the plants release point. The maximum exposed individual dose from ingestion of fish is assumed to be that calculated for the consumption of fish caught anywhere between the plant and the first downstream dam. The maximum exposed individual dose from drinking water is assumed to be that calculated at the nearest downstream public water supply [West Morgan East Lawrence (WMEL)]. This could be interpreted as indicating that the maximum exposed individual, as assumed for liquid releases from BFN, is an individual who obtains all drinking water at WMEL, consumes fish caught from the Tennessee River between BFN and Wheeler Dam, and spends 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> per year on the shoreline just downstream of the Page 29 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact plants release point. Doses calculated for the maximum exposed individual due to liquid effluents for each quarter in the period are presented in Table 4 along with the average river flows past the plant site for the periods.

F. Population Doses Population doses due to airborne effluents are calculated for people living within a 50mile radius of the plant site. Doses from external pathways and inhalation are based on the 50mile human population distribution. Ingestion population doses are calculated assuming that each individual consumed milk, vegetables, and meat produced within the sector in which the individual resides.

Population doses due to liquid effluents are calculated for the entire downstream Tennessee River population. Water ingestion population doses are calculated using actual population figures for downstream public water supplies. Fish ingestion population doses are calculated assuming that all sport fish caught in the Tennessee River are consumed by the Tennessee River population. Recreation population doses are calculated using historical recreational data on the number of shoreline visits at downstream locations.

Population doses calculated for airborne and liquid effluents are presented in Tables 3 and 4.

G. Offsite Direct Radiation Dose External gamma radiation levels were measured by environmental dosimeters deployed around BFN as part of the offsite Radiological Environmental Monitoring Program (REMP).

The results for environmental dosimeter measurements are normalized to a standard quarter (91 days). The monitoring locations are grouped according to the distance from the plant. The first group consists of all monitoring points within 2 miles of the plant. The second group is made up of all locations greater than 2 miles from the plant. Past data have shown that the average results from the locations more than 2 miles from the plant are essentially the same. Therefore, for purposes of this report, monitoring points 2 miles or less from the plant are identified as onsite stations and locations greater than 2 miles are considered offsite stations. The quarterly gamma radiation levels determined from these dosimeters deployed around BFN in 2020 averaged approximately 18.2 mrem/quarter at onsite stations and approximately 16.0 mrem/quarter at offsite stations. The onsite stations are approximately 2.2 mrem/quarter higher than at offsite stations. This difference is consistent with levels measured for preoperational and construction phases at BFN where the average radiation levels onsite were generally 26 mrem/quarter higher than the levels offsite. This may be attributed to natural variations in environmental radiation levels, earth moving activities onsite, the mass of concrete employed in the construction of the plants, or other undetermined influences. Fluctuations in natural background dose rates and in dosimeter readings tend to mask any small increments which may be due to plant operations. Thus, there was no identifiable increase in dose rate levels attributable to direct radiation from plant equipment and/or gaseous effluents.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact H. Dose to a Member of the Public Inside the Site Boundary Pursuant to ODCM Section 7.7.5, a review was performed to determine the highest dose to a member of the public in the site boundary. The dose to a member of the public consists of the sum of dose commitments from effluent releases as well as any direct radiation dose.

The gaseous effluent dose commitment is negligible compared to the direct radiation dose.

The direct radiation dose was determined from area environmental dosimeters located onsite. It consisted of gamma dose from the plume, ground contamination, and from equipment sources (i.e., tanks, turbine shine, radioactive material storage areas, etc.). The critical location was determined to be an Optically Stimulated Luminescence (OSL) dosimeter near the Livewell Center (SE1). The direct radiation dose at the Livewell Center, accounting for background and occupancy, was approximately 0.7 mrem/quarter during 2020.

The total annual dose commitment to a member of the public for 2020 was 2.8 mrem. It can be concluded that the dose limit for a member of the public at the site boundary as specified in 10 CFR 20.1301 was not exceeded.

I. Total Dose To determine compliance with 40 CFR 190, annual total dose contributions to the maximum exposed individual from BFN radioactive effluents and all other nearby uranium fuel cycle sources are considered.

The annual dose to any organ other than the thyroid for the maximum exposed individual is conservatively calculated by summing the following doses: the total body air submersion dose for each quarter, the critical organ dose (for any organ other than the thyroid) from airborne effluents for each quarter from ground contamination, inhalation and ingestion, the total body dose from liquid effluents for each quarter, the maximum organ dose (for any organ other than the thyroid) from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the REMP. This dose is compared to the 40 CFR 190 limit for total body or any organ dose (other than the thyroid) to determine compliance.

The annual thyroid dose to the maximum exposed individual is conservatively estimated by summing the following doses: the total body air submersion dose for each quarter, the thyroid dose from airborne effluents for each quarter, the total body dose from liquid effluents for each quarter, the thyroid dose from liquid effluents for each quarter, and any identifiable increase in direct radiation dose levels as measured by the REMP. This dose is compared to the 40 CFR 190 limit for thyroid dose to determine compliance.

Total dose from the fuel cycle is presented in Table 5.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact J. Tables Table 3A Doses from Airborne Effluents - 1st Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 4.18E05 mrad 10 mrad < 1% NNW 7400 meters Gamma Air 1.11E04 mrad 5 mrad < 1% NNW 7400 meters NG Skin 4.59E04 mrad NA NA NNW 1650 meters NG Total Body 3.81E04 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 2.53E02 mrem 7.5 mrem < 1% NNW 4350 meters Child / Total Body 2.51E02 mrem 7.5 mrem < 1% NNW 4350 meters Child / Bone 3.59E02 mrem 7.5 mrem < 1% NNW 4350 meters Population Doses Total Body Dose 2.39E01 manrem Maximum Organ Dose (Organ) 7.92E01 manrem (Bone)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 3B Doses from Airborne Effluents - 2nd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 1.72E05 mrad 10 mrad < 1% N 5300 meters Gamma Air 4.46E05 mrad 5 mrad < 1% N 5300 meters NG Skin 4.15E04 mrad NA NA E 1410 meters NG Total Body 3.53E04 mrad NA NA E 1410 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 1.41E02 mrem 7.5 mrem < 1% E 1530 meters Child / Total Body 1.41E02 mrem 7.5 mrem < 1% E 1530 meters Child / Bone 3.42E02 mrem 7.5 mrem < 1% N 6200 Population Doses Total Body Dose 2.59E01 manrem Maximum Organ Dose (Organ) 9.45E01 manrem (Bone)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 3C Doses from Airborne Effluents - 3rd Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 1.30E05 mrad 10 mrad < 1% NE 5000 meters Gamma Air 3.97E05 mrad 5 mrad < 1% NE 5000 meters NG Skin 3.49E04 mrad NA NA E 1410 meters NG Total Body 2.92E04 mrad NA NA E 1410 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 1.48E02 mrem 7.5 mrem < 1% E 1530 meters Child / Total Body 1.45E02 mrem 7.5 mrem < 1% E 1530 meters Child / Bone 4.34E02 mrem 7.5 mrem < 1% NNW 4350 Population Doses Total Body Dose 2.65E01 manrem Maximum Organ Dose (Organ) 1.08E+00 manrem (Bone)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 3D Doses from Airborne Effluents - 4th Quarter Individual Doses Pathway Dose Quarterly Limit Percent of Limit Location Beta Air 2.55E06 mrad 10 mrad < 1% WNW 5500 meters Gamma Air 7.24E06 mrad 5 mrad < 1% WNW 5500 meters NG Skin 2.53E04 mrad NA NA NNW 1650 meters NG Total Body 2.14E04 mrad NA NA NNW 1650 meters Organ Doses (Iodine, Tritium, Particulates with >8Day halflife)

Child / Thyroid 1.26E02 mrem 7.5 mrem < 1% NNW 4350 meters Child / Total Body 1.25E02 mrem 7.5 mrem < 1% NNW 4350 meters Child / Bone 2.77E02 mrem 7.5 mrem < 1% NNW 4350 meters Population Doses Total Body Dose 2.17E01 manrem Maximum Organ Dose (Organ) 7.84E01 manrem (Bone)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 4A Doses from Liquid Effluents - 1st Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Total Body 1.30E04 mrem 1.5 mrem < 1%

Child Liver 1.60E04 mrem 5 mrem < 1%

Child Thyroid 1.20E04 mrem 5 mrem < 1%

Average River Flow past BFN: 139,814 CFS Population Doses Total Body Dose 8.30E03 manrem Maximum Organ Dose (Organ) 8.50E03 manrem (Liver)

Table 4B Doses from Liquid Effluents - 2nd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Child Total Body 2.00E04 mrem 1.5 mrem < 1%

Child Liver 2.40E04 mrem 5 mrem < 1%

Child Thyroid 1.80E04 mrem 5 mrem < 1%

Average River Flow past BFN: 68,140 CFS Population Doses Total Body Dose 1.20E02 manrem Maximum Organ Dose (Organ) 1.20E02 manrem (Liver)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 4C Doses from Liquid Effluents - 3rd Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Adult Total Body 6.80E04 mrem 1.5 mrem < 1%

Child Bone 8.80E04 mrem 5mrem < 1%

Child Thyroid 4.20E04 mrem 5 mrem < 1%

Average River Flow past BFN: 29,455 CFS Population Doses Total Body Dose 3.90E02 manrem Maximum Organ Dose (Organ) 4.00E02 manrem (Bone)

Table 4D Doses from Liquid Effluents - 4th Quarter Individual Doses Age Group Organ Dose Quarterly Limit Percent of Limit Adult Total Body 4.70E04 mrem 1.5 mrem < 1%

Child Bone 6.20E04 mrem 5 mrem < 1%

Child Thyroid 2.50E04 mrem 5 mrem < 1%

Average River Flow past BFN: 57,905 CFS Population Doses Total Body Dose 2.00E02 manrem Maximum Organ Dose (Organ) 2.10E02 manrem (Liver)

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 4E Total Dose from I131 Water Ingestion Individual Doses Quarter 1 2 3 4 Total I131 (Ci) <LLD <LLD <LLD <LLD <LLD Thyroid (mrem) NA NA NA NA NA Population /

NA NA NA NA NA Thyroid (mrem)

The REMP requirements as specified in Table 3.121 from NUREG 1302, Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, dated April 1991, requires an I131 specific analysis for drinking water pathway samples if the annual dose from I131 is greater than 1 mrem. In order to evaluate the need for implementation of this additional analysis, the drinking water pathway dose from I131 to the maximum organ and age group is calculated. Based on Table 4E, the performance of the I131 specific analysis is not required for BFN REMP drinking water samples, as I131 was not identified in any liquid effluent from the plant.

Table 4F Total Dose from Groundwater Individual Doses Quarter 1 2 3 4 Total Tritium (Ci) 4.43E07 4.43E07 4.43E07 4.43E07 1.77E06 Child (mrem) 1.20E12 2.50E12 5.80E12 3.00E12 1.25E11 Population 1.90E11 4.10E11 9.20E11 4.70E11 1.99E10 (mrem)

As determined in the 2006 Groundwater study, the estimated groundwater/channel water dilution ratio is 1:20,000 at a rate of approximately 0.5 gpm. Using the highest measured groundwater tritium concentration in 2020, 35,400 pCi/L, the aqueous tritium concentration in the channel, after dilution, would be 1.77E09 uCi/mL. Assuming 1.77E09 uCi/mL concentration at a release rate of 0.5 gpm for the entire year results in a total release of approximately 1.77E06 Curies. The calculated hypothetical dose to the maximum exposed member of the public would be 1.25E11 mrem (reference Table 4F).

The calculated hypothetical annual dose to a maximum exposed member of the public is less than 1 mrem.

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Radiological Impact Table 5 Total Dose from Fuel Cycle First Second Third Fourth Dose Quarter Quarter Quarter Quarter Total Body or any Organ (except thyroid)

Total body air 3.81E04 3.53E04 2.92E04 2.14E04 (submersion)

Critical organ 3.59E02 3.42E02 4.34E02 2.77E02 dose (airborne)

Total body dose 1.30E04 2.00E04 6.80E04 4.70E04 (liquid)

Maximum organ 1.60E04 2.40E04 8.80E04 6.20E04 dose (liquid)

Direct Radiation 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Dose Total 3.66E02 3.50E02 4.53E02 2.90E02 Cumulative Total Dose (mrem) 1.46E01 Annual Dose Limit (mrem) 2.5E+01 Percent of Limit < 1%

Thyroid Total body air 3.81E04 3.53E04 2.92E04 2.14E04 (submersion)

Thyroid dose 2.53E02 1.41E02 1.48E02 1.26E02 (airborne)

Total body dose 1.30E04 2.00E04 6.80E04 4.70E04 (liquid)

Thyroid dose 1.20E04 1.80E04 4.20E04 2.50E04 (liquid)

Total 2.59E02 1.48E02 1.62E02 1.35E02 Cumulative Total Dose (mrem) 7.05E02 Annual Dose Limit (mrem) 7.5E+01 Percent of Limit < 1%

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Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data VI. Meteorological Data Table 6A 1st Quarter JFD Ground Level Releases Joint Frequency Distribution In Percent Page 40 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.092 NNE 0.000 0.000 0.000 0.000 0.000 0.322 0.000 0.000 0.000 0.322 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.092 0.644 0.092 0.000 0.000 0.000 0.000 0.828 SSE 0.000 0.000 0.276 0.414 0.046 0.000 0.000 0.000 0.000 0.736 S 0.000 0.000 0.322 0.138 0.000 0.000 0.000 0.000 0.000 0.460 SSW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 SW 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.092 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.138 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.322 0.000 0.000 0.322 NNW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 SUBTOTAL 0.000 0.000 0.736 1.334 0.230 0.506 0.368 0.000 0.000 3.174 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS A 69 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 69 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 6.16 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 41 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.184 0.092 0.000 0.000 0.000 0.276 NNE 0.000 0.000 0.000 0.000 0.230 0.184 0.000 0.000 0.000 0.414 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.092 SE 0.000 0.000 0.046 0.184 0.000 0.000 0.000 0.000 0.000 0.230 SSE 0.000 0.000 0.460 0.092 0.000 0.000 0.000 0.000 0.000 0.552 S 0.000 0.000 0.184 0.046 0.000 0.000 0.000 0.000 0.000 0.230 SSW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 0.000 0.138 0.000 0.000 0.000 0.184 WNW 0.000 0.000 0.000 0.000 0.000 0.276 0.138 0.000 0.000 0.414 NW 0.000 0.000 0.000 0.000 0.000 0.092 0.230 0.000 0.000 0.322 NNW 0.000 0.000 0.000 0.000 0.046 0.138 0.000 0.000 0.000 0.184 SUBTOTAL 0.000 0.000 0.782 0.506 0.506 0.920 0.368 0.000 0.000 3.082 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS B 67 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 67 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 6.89 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 42 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.046 0.276 0.046 0.000 0.000 0.000 0.368 NNE 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.092 NE 0.000 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.000 0.138 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.138 0.230 0.000 0.000 0.000 0.000 0.000 0.368 SSE 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 S 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.046 0.092 0.000 0.000 0.000 0.138 W 0.000 0.000 0.000 0.046 0.000 0.092 0.000 0.000 0.000 0.138 WNW 0.000 0.000 0.000 0.000 0.000 0.322 0.184 0.000 0.000 0.506 NW 0.000 0.000 0.000 0.000 0.000 0.276 0.184 0.000 0.000 0.460 NNW 0.000 0.000 0.000 0.000 0.092 0.000 0.092 0.000 0.000 0.184 SUBTOTAL 0.000 0.000 0.322 0.414 0.552 0.920 0.460 0.000 0.000 2.668 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS C 58 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 58 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 8.07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 43 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.092 0.506 1.472 0.598 0.000 0.000 0.000 2.668 NNE 0.000 0.000 0.414 0.598 1.104 1.426 0.000 0.000 0.000 3.542 NE 0.000 0.000 0.414 0.920 0.736 0.828 0.000 0.000 0.000 2.898 ENE 0.000 0.046 0.368 0.230 0.046 0.000 0.000 0.000 0.000 0.690 E 0.000 0.000 0.276 0.138 0.046 0.000 0.000 0.000 0.000 0.460 ESE 0.000 0.000 0.598 0.506 0.000 0.000 0.000 0.000 0.000 1.104 SE 0.000 0.000 0.782 0.782 0.092 0.000 0.000 0.000 0.000 1.656 SSE 0.000 0.046 1.472 0.276 0.092 0.000 0.000 0.000 0.000 1.886 S 0.000 0.046 0.736 0.046 0.092 0.000 0.000 0.000 0.000 0.920 SSW 0.000 0.000 0.598 0.184 0.000 0.000 0.000 0.000 0.000 0.782 SW 0.000 0.092 0.368 0.046 0.000 0.000 0.000 0.000 0.000 0.506 WSW 0.000 0.000 0.552 0.460 0.414 0.046 0.000 0.000 0.000 1.472 W 0.000 0.000 0.368 0.598 1.104 0.552 0.000 0.000 0.000 2.622 WNW 0.000 0.000 0.138 0.184 0.414 1.288 0.644 0.092 0.000 2.760 NW 0.000 0.000 0.184 0.230 0.552 1.656 1.242 0.092 0.000 3.956 NNW 0.000 0.046 0.046 0.138 0.690 1.380 0.092 0.000 0.000 2.392 SUBTOTAL 0.000 0.276 7.406 5.842 6.854 7.774 1.978 0.184 0.000 30.313 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS D 659 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 659 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 6.41 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 44 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.046 0.552 0.414 0.690 0.138 0.000 0.000 0.000 1.840 NNE 0.000 0.000 0.828 0.644 0.552 0.276 0.000 0.000 0.000 2.300 NE 0.000 0.092 0.506 0.644 0.276 0.230 0.092 0.000 0.000 1.840 ENE 0.000 0.092 0.368 0.184 0.184 0.046 0.000 0.000 0.000 0.874 E 0.000 0.000 0.644 0.276 0.046 0.000 0.000 0.000 0.000 0.966 ESE 0.000 0.322 1.840 0.460 0.230 0.000 0.000 0.000 0.000 2.852 SE 0.000 0.460 2.162 0.460 0.046 0.000 0.000 0.000 0.000 3.128 SSE 0.000 0.460 2.760 0.920 0.276 0.000 0.000 0.000 0.000 4.416 S 0.000 0.230 1.840 1.334 0.736 0.046 0.000 0.000 0.000 4.186 SSW 0.000 0.138 0.552 0.414 0.092 0.000 0.000 0.000 0.000 1.196 SW 0.000 0.184 0.782 0.046 0.000 0.000 0.000 0.000 0.000 1.012 WSW 0.000 0.092 1.058 0.460 0.046 0.000 0.000 0.000 0.000 1.656 W 0.000 0.092 0.828 0.782 0.368 0.092 0.046 0.000 0.000 2.208 WNW 0.000 0.046 0.414 0.460 0.322 0.414 0.322 0.000 0.000 1.978 NW 0.000 0.092 0.368 0.230 0.184 0.690 0.322 0.000 0.000 1.886 NNW 0.000 0.046 0.552 0.506 0.138 0.276 0.000 0.000 0.000 1.518 SUBTOTAL 0.000 2.392 16.053 8.234 4.186 2.208 0.782 0.000 0.000 33.855 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS E 736 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 736 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 4.01 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 45 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.002 0.046 0.552 0.230 0.046 0.000 0.000 0.000 0.000 0.876 NNE 0.002 0.046 0.506 0.092 0.092 0.046 0.000 0.000 0.000 0.784 NE 0.001 0.000 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.185 ENE 0.003 0.276 0.506 0.046 0.000 0.000 0.000 0.000 0.000 0.831 E 0.003 0.046 0.690 0.138 0.000 0.000 0.000 0.000 0.000 0.877 ESE 0.006 0.414 1.288 0.184 0.000 0.000 0.000 0.000 0.000 1.892 SE 0.005 0.644 0.828 0.276 0.000 0.000 0.000 0.000 0.000 1.753 SSE 0.012 0.322 3.220 1.012 0.138 0.138 0.000 0.000 0.000 4.842 S 0.007 0.230 1.840 2.300 0.736 0.092 0.000 0.000 0.000 5.205 SSW 0.001 0.092 0.092 0.230 0.092 0.092 0.000 0.000 0.000 0.599 SW 0.001 0.092 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.277 WSW 0.001 0.092 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.185 W 0.000 0.000 0.092 0.000 0.046 0.046 0.000 0.000 0.000 0.184 WNW 0.001 0.000 0.184 0.046 0.092 0.000 0.000 0.000 0.000 0.323 NW 0.002 0.184 0.276 0.092 0.000 0.000 0.046 0.000 0.000 0.600 NNW 0.001 0.046 0.276 0.184 0.000 0.000 0.000 0.000 0.000 0.507 SUBTOTAL 0.046 2.530 10.810 4.830 1.242 0.414 0.046 0.000 0.000 19.917 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS F 433 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 433 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 3.16 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 46 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.046 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.322 NNE 0.000 0.092 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.230 NE 0.000 0.230 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.276 ENE 0.000 0.138 0.138 0.046 0.000 0.000 0.000 0.000 0.000 0.322 E 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.138 SE 0.000 0.414 0.414 0.000 0.000 0.000 0.000 0.000 0.000 0.828 SSE 0.000 0.276 2.438 0.598 0.092 0.000 0.000 0.000 0.000 3.404 S 0.000 0.000 0.598 0.138 0.046 0.000 0.000 0.000 0.000 0.782 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NW 0.000 0.138 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.184 NNW 0.000 0.184 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.276 SUBTOTAL 0.000 1.748 4.278 0.782 0.184 0.000 0.000 0.000 0.000 6.992 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS G 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 2.32 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 47 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 6B 2nd Quarter JFD Ground Level Releases Joint Frequency Distribution In Percent Page 48 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.458 0.000 0.000 0.000 0.458 NNE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.183 0.229 0.000 0.000 0.000 0.000 0.000 0.412 SE 0.000 0.000 0.412 0.366 0.000 0.000 0.000 0.000 0.000 0.779 SSE 0.000 0.000 0.733 0.046 0.000 0.000 0.000 0.000 0.000 0.779 S 0.000 0.000 0.779 0.137 0.000 0.000 0.000 0.000 0.000 0.916 SSW 0.000 0.000 0.412 0.183 0.000 0.000 0.000 0.000 0.000 0.596 SW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.046 0.000 0.000 0.183 0.092 0.000 0.321 NNW 0.000 0.000 0.000 0.000 0.000 0.229 0.046 0.000 0.000 0.275 SUBTOTAL 0.000 0.000 2.565 1.054 0.000 0.733 0.229 0.092 0.000 4.672 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS A 102 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 102 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 4.90 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 49 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.321 0.000 0.000 0.000 0.321 NNE 0.000 0.000 0.000 0.000 0.092 0.412 0.000 0.000 0.000 0.504 NE 0.000 0.000 0.000 0.000 0.000 0.137 0.000 0.000 0.000 0.137 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.046 0.366 0.000 0.000 0.000 0.000 0.000 0.412 SE 0.000 0.000 0.458 0.183 0.000 0.000 0.000 0.000 0.000 0.641 SSE 0.000 0.000 0.275 0.046 0.000 0.000 0.000 0.000 0.000 0.321 S 0.000 0.000 0.504 0.137 0.000 0.000 0.000 0.000 0.000 0.641 SSW 0.000 0.000 0.183 0.137 0.000 0.000 0.000 0.000 0.000 0.321 SW 0.000 0.000 0.183 0.137 0.000 0.000 0.000 0.000 0.000 0.321 WSW 0.000 0.000 0.092 0.183 0.000 0.000 0.000 0.000 0.000 0.275 W 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.000 0.000 0.137 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.137 0.000 0.000 0.137 NW 0.000 0.000 0.000 0.000 0.046 0.229 0.183 0.046 0.000 0.504 NNW 0.000 0.000 0.000 0.000 0.046 0.366 0.046 0.000 0.000 0.458 SUBTOTAL 0.000 0.000 1.741 1.283 0.229 1.466 0.366 0.046 0.000 5.131 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS B 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 6.17 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 50 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.046 0.092 0.229 0.000 0.000 0.000 0.366 NNE 0.000 0.000 0.000 0.000 0.275 0.275 0.000 0.000 0.000 0.550 NE 0.000 0.000 0.000 0.046 0.000 0.183 0.092 0.000 0.000 0.321 ENE 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.092 E 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.000 0.046 0.183 0.092 0.000 0.000 0.000 0.000 0.321 SE 0.000 0.000 0.596 0.000 0.000 0.000 0.000 0.000 0.000 0.596 SSE 0.000 0.000 0.321 0.046 0.000 0.000 0.000 0.000 0.000 0.366 S 0.000 0.000 0.504 0.046 0.000 0.000 0.000 0.000 0.000 0.550 SSW 0.000 0.000 0.321 0.183 0.000 0.000 0.000 0.000 0.000 0.504 SW 0.000 0.000 0.275 0.046 0.000 0.000 0.000 0.000 0.000 0.321 WSW 0.000 0.000 0.000 0.412 0.046 0.000 0.000 0.000 0.000 0.458 W 0.000 0.000 0.000 0.504 0.275 0.046 0.000 0.000 0.000 0.825 WNW 0.000 0.000 0.046 0.000 0.092 0.183 0.137 0.000 0.000 0.458 NW 0.000 0.000 0.046 0.000 0.046 0.321 0.366 0.000 0.000 0.779 NNW 0.000 0.000 0.046 0.000 0.183 0.137 0.000 0.000 0.000 0.366 SUBTOTAL 0.000 0.000 2.290 1.557 1.145 1.374 0.596 0.000 0.000 6.963 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS C 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 152 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 6.00 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 51 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.229 0.321 0.687 0.229 0.046 0.000 0.000 1.512 NNE 0.000 0.000 0.137 0.550 0.596 0.321 0.000 0.000 0.000 1.603 NE 0.000 0.000 0.183 0.229 0.412 0.412 0.000 0.000 0.000 1.237 ENE 0.000 0.000 0.366 0.229 0.092 0.046 0.000 0.000 0.000 0.733 E 0.000 0.000 0.596 0.641 0.229 0.046 0.000 0.000 0.000 1.512 ESE 0.000 0.046 1.557 1.008 0.229 0.092 0.000 0.000 0.000 2.932 SE 0.000 0.000 1.420 0.046 0.000 0.000 0.000 0.000 0.000 1.466 SSE 0.000 0.229 1.741 0.092 0.000 0.000 0.000 0.000 0.000 2.061 S 0.000 0.275 0.962 0.229 0.000 0.000 0.000 0.000 0.000 1.466 SSW 0.000 0.137 1.374 0.275 0.000 0.000 0.000 0.000 0.000 1.787 SW 0.000 0.137 0.733 0.137 0.000 0.000 0.000 0.000 0.000 1.008 WSW 0.000 0.000 0.825 0.733 0.137 0.092 0.000 0.000 0.000 1.787 W 0.000 0.000 1.099 1.970 0.962 0.870 0.046 0.000 0.000 4.947 WNW 0.000 0.000 0.092 0.641 0.687 1.328 0.916 0.000 0.000 3.665 NW 0.000 0.000 0.229 0.596 0.733 1.741 0.504 0.000 0.000 3.802 NNW 0.000 0.000 0.046 0.504 0.504 0.412 0.137 0.000 0.000 1.603 SUBTOTAL 0.000 0.825 11.590 8.200 5.268 5.589 1.649 0.000 0.000 33.120 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS D 723 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 723 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 5.34 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 52 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.046 0.916 0.550 0.137 0.046 0.000 0.000 0.000 1.695 NNE 0.000 0.000 0.412 0.550 0.092 0.046 0.000 0.000 0.000 1.099 NE 0.000 0.229 0.458 0.275 0.046 0.046 0.000 0.000 0.000 1.054 ENE 0.000 0.229 1.283 0.504 0.046 0.000 0.000 0.000 0.000 2.061 E 0.000 0.275 3.069 1.832 0.550 0.092 0.000 0.000 0.000 5.818 ESE 0.000 0.596 2.703 0.687 0.412 0.046 0.000 0.000 0.000 4.443 SE 0.000 0.366 1.099 0.092 0.000 0.000 0.000 0.000 0.000 1.557 SSE 0.000 0.458 1.328 0.046 0.000 0.000 0.000 0.000 0.000 1.832 S 0.000 0.321 1.008 0.137 0.000 0.000 0.000 0.000 0.000 1.466 SSW 0.000 0.275 0.596 0.092 0.000 0.000 0.000 0.000 0.000 0.962 SW 0.000 0.092 0.504 0.000 0.000 0.000 0.000 0.000 0.000 0.596 WSW 0.000 0.137 0.596 0.183 0.000 0.046 0.000 0.000 0.000 0.962 W 0.000 0.092 0.687 0.733 0.229 0.046 0.000 0.000 0.000 1.787 WNW 0.000 0.000 0.137 0.092 0.092 0.046 0.000 0.000 0.000 0.366 NW 0.000 0.137 0.458 0.229 0.275 0.183 0.000 0.000 0.000 1.283 NNW 0.000 0.000 0.779 0.458 0.458 0.504 0.046 0.000 0.000 2.245 SUBTOTAL 0.000 3.252 16.033 6.459 2.336 1.099 0.046 0.000 0.000 29.226 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS E 638 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 638 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 3.24 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 53 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.046 1.283 0.275 0.000 0.000 0.000 0.000 0.000 1.603 NNE 0.000 0.092 0.641 0.641 0.046 0.000 0.000 0.000 0.000 1.420 NE 0.000 0.229 0.641 0.046 0.000 0.000 0.000 0.000 0.000 0.916 ENE 0.000 0.183 0.733 0.183 0.000 0.000 0.000 0.000 0.000 1.099 E 0.000 0.412 1.466 0.183 0.046 0.000 0.000 0.000 0.000 2.107 ESE 0.000 0.321 0.779 0.137 0.046 0.000 0.000 0.000 0.000 1.283 SE 0.000 0.412 0.321 0.046 0.000 0.000 0.000 0.000 0.000 0.779 SSE 0.000 0.229 0.275 0.000 0.000 0.000 0.000 0.000 0.000 0.504 S 0.000 0.137 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.321 SSW 0.000 0.092 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.275 SW 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 WSW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 W 0.000 0.092 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.183 WNW 0.000 0.046 0.092 0.046 0.000 0.046 0.000 0.000 0.000 0.229 NW 0.000 0.000 0.229 0.000 0.000 0.000 0.000 0.000 0.000 0.229 NNW 0.000 0.046 0.550 0.366 0.000 0.000 0.000 0.000 0.000 0.962 SUBTOTAL 0.000 2.382 7.558 1.970 0.137 0.046 0.000 0.000 0.000 12.093 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS F 264 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 264 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 2.50 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 54 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.026 1.328 1.008 0.183 0.000 0.000 0.000 0.000 0.000 2.545 NNE 0.012 0.596 0.458 0.046 0.000 0.000 0.000 0.000 0.000 1.111 NE 0.009 0.229 0.596 0.000 0.000 0.000 0.000 0.000 0.000 0.834 ENE 0.009 0.412 0.366 0.046 0.000 0.000 0.000 0.000 0.000 0.833 E 0.006 0.321 0.229 0.000 0.000 0.000 0.000 0.000 0.000 0.556 ESE 0.004 0.137 0.229 0.000 0.000 0.000 0.000 0.000 0.000 0.371 SE 0.005 0.275 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.463 SSE 0.002 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.139 S 0.001 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.001 0.092 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.138 WSW 0.001 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.002 0.137 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.185 NW 0.004 0.275 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.371 NNW 0.012 0.870 0.183 0.092 0.000 0.000 0.000 0.000 0.000 1.157 SUBTOTAL 0.092 4.810 3.436 0.412 0.046 0.000 0.000 0.000 0.000 8.795 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS G 192 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 192 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2183 TOTAL HOURS CALM 2 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 1.64 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 55 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 6C 3rd Quarter JFD Ground Level Releases Joint Frequency Distribution In Percent Page 56 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.046 0.137 0.000 0.000 0.000 0.183 NNE 0.000 0.000 0.000 0.000 0.046 0.137 0.000 0.000 0.000 0.183 NE 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.091 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.091 ESE 0.000 0.000 0.365 0.457 0.046 0.000 0.000 0.000 0.000 0.868 SE 0.000 0.000 1.142 1.142 0.000 0.000 0.000 0.000 0.000 2.283 SSE 0.000 0.000 1.826 0.822 0.000 0.000 0.000 0.000 0.000 2.648 S 0.000 0.000 0.639 0.320 0.000 0.000 0.000 0.000 0.000 0.959 SSW 0.000 0.000 0.320 0.183 0.000 0.000 0.000 0.000 0.000 0.502 SW 0.000 0.000 0.274 0.091 0.000 0.000 0.000 0.000 0.000 0.365 WSW 0.000 0.000 0.091 0.274 0.137 0.000 0.000 0.000 0.000 0.502 W 0.000 0.000 0.000 0.183 0.548 0.411 0.000 0.000 0.000 1.142 WNW 0.000 0.000 0.000 0.000 0.183 0.548 0.000 0.000 0.000 0.731 NW 0.000 0.000 0.000 0.000 0.046 0.137 0.046 0.000 0.000 0.228 NNW 0.000 0.000 0.000 0.000 0.046 0.502 0.000 0.000 0.000 0.548 SUBTOTAL 0.000 0.000 4.703 3.516 1.096 1.963 0.046 0.000 0.000 11.324 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS A 248 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 248 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 4.78 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 57 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 NNE 0.000 0.000 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.137 NE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.000 0.000 0.137 ESE 0.000 0.000 0.091 0.183 0.000 0.000 0.000 0.000 0.000 0.274 SE 0.000 0.000 0.639 0.046 0.000 0.000 0.000 0.000 0.000 0.685 SSE 0.000 0.000 0.639 0.046 0.000 0.000 0.000 0.000 0.000 0.685 S 0.000 0.000 0.548 0.183 0.000 0.000 0.000 0.000 0.000 0.731 SSW 0.000 0.000 0.228 0.228 0.000 0.000 0.000 0.000 0.000 0.457 SW 0.000 0.000 0.274 0.091 0.000 0.000 0.000 0.000 0.000 0.365 WSW 0.000 0.000 0.046 0.274 0.091 0.000 0.000 0.000 0.000 0.411 W 0.000 0.000 0.091 0.274 0.457 0.091 0.000 0.000 0.000 0.913 WNW 0.000 0.000 0.000 0.046 0.274 0.046 0.000 0.000 0.000 0.365 NW 0.000 0.000 0.000 0.046 0.046 0.091 0.000 0.000 0.000 0.183 NNW 0.000 0.000 0.000 0.000 0.091 0.320 0.000 0.000 0.000 0.411 SUBTOTAL 0.000 0.000 2.603 1.507 1.050 0.685 0.000 0.000 0.000 5.845 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS B 128 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 128 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 4.51 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 58 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.091 NNE 0.000 0.000 0.000 0.091 0.183 0.365 0.000 0.000 0.000 0.639 NE 0.000 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.000 0.137 ENE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.091 0.000 0.046 0.000 0.000 0.000 0.000 0.137 ESE 0.000 0.000 0.228 0.137 0.046 0.000 0.000 0.000 0.000 0.411 SE 0.000 0.000 0.594 0.046 0.000 0.000 0.000 0.000 0.000 0.639 SSE 0.000 0.000 0.731 0.000 0.000 0.000 0.000 0.000 0.000 0.731 S 0.000 0.000 0.594 0.046 0.000 0.000 0.000 0.000 0.000 0.639 SSW 0.000 0.000 0.502 0.000 0.000 0.000 0.000 0.000 0.000 0.502 SW 0.000 0.000 0.137 0.183 0.000 0.000 0.000 0.000 0.000 0.320 WSW 0.000 0.000 0.365 0.137 0.046 0.000 0.000 0.000 0.000 0.548 W 0.000 0.000 0.091 0.457 0.320 0.137 0.000 0.000 0.000 1.005 WNW 0.000 0.000 0.000 0.137 0.046 0.183 0.046 0.000 0.000 0.411 NW 0.000 0.000 0.000 0.000 0.046 0.137 0.046 0.000 0.000 0.228 NNW 0.000 0.000 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.183 SUBTOTAL 0.000 0.000 3.379 1.324 0.913 0.959 0.091 0.000 0.000 6.667 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS C 146 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 146 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 4.61 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 59 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.274 0.320 0.274 0.091 0.000 0.000 0.000 0.959 NNE 0.000 0.000 0.411 0.411 0.274 0.274 0.000 0.000 0.000 1.370 NE 0.000 0.000 0.320 0.411 0.685 0.183 0.046 0.000 0.000 1.644 ENE 0.000 0.000 0.639 0.046 0.320 0.046 0.000 0.000 0.000 1.050 E 0.000 0.091 0.639 1.005 0.502 0.091 0.000 0.000 0.000 2.329 ESE 0.000 0.046 0.731 0.685 0.000 0.046 0.000 0.000 0.000 1.507 SE 0.000 0.000 0.685 0.091 0.000 0.000 0.000 0.000 0.000 0.776 SSE 0.000 0.091 1.416 0.183 0.000 0.000 0.000 0.000 0.000 1.689 S 0.000 0.000 2.100 0.365 0.000 0.000 0.000 0.000 0.000 2.466 SSW 0.000 0.091 2.055 0.320 0.000 0.000 0.000 0.000 0.000 2.466 SW 0.000 0.046 0.868 0.046 0.000 0.000 0.000 0.000 0.000 0.959 WSW 0.000 0.091 1.963 0.639 0.000 0.046 0.000 0.000 0.000 2.740 W 0.000 0.000 1.735 1.187 0.411 0.046 0.000 0.000 0.000 3.379 WNW 0.000 0.000 0.091 0.411 0.091 0.411 0.000 0.000 0.000 1.005 NW 0.000 0.000 0.274 0.365 0.228 0.228 0.137 0.000 0.000 1.233 NNW 0.000 0.000 0.365 0.594 0.411 0.320 0.000 0.000 0.000 1.689 SUBTOTAL 0.000 0.457 14.566 7.078 3.196 1.781 0.183 0.000 0.000 27.260 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS D 597 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 597 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 3.87 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 60 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.137 1.781 1.142 0.137 0.046 0.000 0.000 0.000 3.242 NNE 0.000 0.183 1.324 1.370 0.776 0.457 0.000 0.000 0.000 4.110 NE 0.000 0.091 0.868 0.594 0.639 0.274 0.000 0.000 0.000 2.466 ENE 0.000 0.183 2.192 0.822 0.091 0.000 0.000 0.000 0.000 3.288 E 0.000 0.274 2.831 3.196 0.548 0.000 0.000 0.000 0.000 6.849 ESE 0.000 0.365 1.416 0.320 0.000 0.000 0.000 0.000 0.000 2.100 SE 0.000 0.228 0.959 0.000 0.000 0.000 0.000 0.000 0.000 1.187 SSE 0.000 0.411 0.685 0.000 0.000 0.000 0.000 0.000 0.000 1.096 S 0.000 0.274 0.822 0.228 0.000 0.000 0.000 0.000 0.000 1.324 SSW 0.000 0.137 0.548 0.000 0.000 0.000 0.000 0.000 0.000 0.685 SW 0.000 0.228 0.228 0.000 0.000 0.000 0.000 0.000 0.000 0.457 WSW 0.000 0.091 0.731 0.274 0.000 0.000 0.000 0.000 0.000 1.096 W 0.000 0.046 1.005 0.411 0.000 0.046 0.000 0.000 0.000 1.507 WNW 0.000 0.091 0.183 0.091 0.137 0.000 0.000 0.000 0.000 0.502 NW 0.000 0.000 0.320 0.091 0.091 0.000 0.000 0.000 0.000 0.502 NNW 0.000 0.091 0.822 0.411 0.137 0.091 0.000 0.000 0.000 1.553 SUBTOTAL 0.000 2.831 16.712 8.950 2.557 0.913 0.000 0.000 0.000 31.963 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS E 700 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 700 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 3.33 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 61 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.274 1.553 0.228 0.000 0.000 0.000 0.000 0.000 2.055 NNE 0.000 0.228 1.142 0.137 0.046 0.000 0.000 0.000 0.000 1.553 NE 0.000 0.183 0.639 0.091 0.091 0.000 0.000 0.000 0.000 1.005 ENE 0.000 0.183 1.050 0.502 0.000 0.000 0.000 0.000 0.000 1.735 E 0.000 0.274 1.187 0.776 0.000 0.000 0.000 0.000 0.000 2.237 ESE 0.000 0.274 0.365 0.046 0.000 0.000 0.000 0.000 0.000 0.685 SE 0.000 0.046 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SSE 0.000 0.046 0.228 0.000 0.000 0.000 0.000 0.000 0.000 0.274 S 0.000 0.091 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.228 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.091 WSW 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.091 NW 0.000 0.091 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.137 NNW 0.000 0.320 0.685 0.000 0.046 0.000 0.000 0.000 0.000 1.050 SUBTOTAL 0.000 2.100 7.215 1.826 0.228 0.000 0.000 0.000 0.000 11.370 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 2.50 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 62 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.014 0.365 1.187 0.183 0.000 0.000 0.000 0.000 0.000 1.749 NNE 0.010 0.411 0.731 0.137 0.000 0.000 0.000 0.000 0.000 1.289 NE 0.007 0.320 0.411 0.000 0.000 0.000 0.000 0.000 0.000 0.737 ENE 0.004 0.183 0.228 0.091 0.046 0.000 0.000 0.000 0.000 0.552 E 0.002 0.000 0.228 0.000 0.000 0.000 0.000 0.000 0.000 0.230 ESE 0.002 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.184 SE 0.002 0.137 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.184 SSE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NNW 0.005 0.320 0.183 0.000 0.000 0.000 0.000 0.000 0.000 0.507 SUBTOTAL 0.046 1.918 3.151 0.411 0.046 0.000 0.000 0.000 0.000 5.571 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS G 122 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 122 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 2.08 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 63 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 6D 4th Quarter JFD Ground Level Releases Joint Frequency Distribution In Percent Page 64 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.091 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 SE 0.000 0.000 0.318 0.364 0.000 0.000 0.000 0.000 0.000 0.682 SSE 0.000 0.000 0.545 0.545 0.000 0.000 0.000 0.000 0.000 1.091 S 0.000 0.000 0.227 0.136 0.000 0.000 0.000 0.000 0.000 0.364 SSW 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 SW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.045 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.091 NNW 0.000 0.000 0.000 0.000 0.000 0.091 0.045 0.000 0.000 0.136 SUBTOTAL 0.000 0.000 1.091 1.273 0.045 0.182 0.136 0.000 0.000 2.727 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS A 60 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 60 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 4.52 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 65 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.182 0.182 0.000 0.000 0.000 0.364 NNE 0.000 0.000 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.136 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.318 0.045 0.000 0.000 0.000 0.000 0.364 SE 0.000 0.000 0.136 0.182 0.000 0.000 0.000 0.000 0.000 0.318 SSE 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.182 S 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.045 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.091 WNW 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.091 NW 0.000 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.045 NNW 0.000 0.000 0.000 0.000 0.182 0.273 0.318 0.000 0.000 0.773 SUBTOTAL 0.000 0.000 0.364 0.636 0.409 0.773 0.364 0.000 0.000 2.545 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS B 56 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 56 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 7.37 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 66 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.045 0.227 0.091 0.000 0.000 0.000 0.364 NNE 0.000 0.000 0.000 0.000 0.045 0.136 0.000 0.000 0.000 0.182 NE 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.045 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.227 0.045 0.000 0.000 0.000 0.000 0.273 SE 0.000 0.000 0.227 0.045 0.000 0.000 0.000 0.000 0.000 0.273 SSE 0.000 0.000 0.318 0.091 0.000 0.000 0.000 0.000 0.000 0.409 S 0.000 0.000 0.273 0.045 0.000 0.000 0.000 0.000 0.000 0.318 SSW 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.227 0.045 0.000 0.000 0.000 0.000 0.273 W 0.000 0.000 0.000 0.045 0.000 0.045 0.045 0.000 0.000 0.136 WNW 0.000 0.000 0.000 0.000 0.045 0.273 0.045 0.000 0.000 0.364 NW 0.000 0.000 0.000 0.000 0.045 0.273 0.136 0.000 0.000 0.455 NNW 0.000 0.000 0.000 0.045 0.045 0.091 0.045 0.000 0.000 0.227 SUBTOTAL 0.000 0.000 0.909 0.773 0.545 0.909 0.273 0.000 0.000 3.409 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS C 75 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 75 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 6.38 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 67 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.273 0.909 1.000 0.455 0.000 0.000 0.000 2.636 NNE 0.000 0.000 0.227 1.000 1.000 0.182 0.136 0.000 0.000 2.545 NE 0.000 0.000 0.091 0.545 0.409 0.227 0.000 0.000 0.000 1.273 ENE 0.000 0.045 0.273 0.227 0.318 0.091 0.000 0.000 0.000 0.955 E 0.000 0.000 0.545 0.409 0.182 0.227 0.000 0.000 0.000 1.364 ESE 0.000 0.000 0.909 1.500 0.045 0.045 0.000 0.000 0.000 2.500 SE 0.000 0.045 1.773 0.455 0.000 0.000 0.000 0.000 0.000 2.273 SSE 0.000 0.000 1.909 0.318 0.000 0.000 0.000 0.000 0.000 2.227 S 0.000 0.045 0.818 0.000 0.000 0.000 0.000 0.000 0.000 0.864 SSW 0.000 0.000 0.591 0.045 0.000 0.000 0.000 0.000 0.000 0.636 SW 0.000 0.000 0.409 0.045 0.000 0.000 0.000 0.000 0.000 0.455 WSW 0.000 0.045 0.500 0.545 0.091 0.091 0.000 0.000 0.000 1.273 W 0.000 0.000 0.727 1.000 0.727 0.727 0.045 0.000 0.000 3.227 WNW 0.000 0.000 0.273 0.591 0.455 0.591 1.000 0.045 0.000 2.955 NW 0.000 0.000 0.227 0.909 0.455 1.273 1.500 0.000 0.000 4.364 NNW 0.000 0.000 0.273 0.591 0.364 1.455 0.136 0.000 0.000 2.818 SUBTOTAL 0.000 0.182 9.818 9.091 5.045 5.364 2.818 0.045 0.000 32.364 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS D 712 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 712 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 5.92 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 68 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.003 0.000 0.955 0.545 0.455 0.045 0.000 0.000 0.000 2.003 NNE 0.003 0.091 0.818 0.591 0.182 0.091 0.000 0.000 0.000 1.775 NE 0.001 0.136 0.182 0.636 0.227 0.091 0.000 0.000 0.000 1.274 ENE 0.003 0.091 0.955 0.364 0.227 0.182 0.000 0.000 0.000 1.821 E 0.007 0.000 2.227 1.455 0.227 0.091 0.000 0.000 0.000 4.007 ESE 0.008 0.318 2.455 2.409 0.227 0.000 0.000 0.000 0.000 5.417 SE 0.006 0.318 1.636 0.364 0.000 0.000 0.000 0.000 0.000 2.324 SSE 0.005 0.091 1.409 1.409 0.455 0.045 0.000 0.000 0.000 3.414 S 0.002 0.136 0.545 0.455 0.227 0.000 0.000 0.000 0.000 1.366 SSW 0.000 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.091 SW 0.001 0.136 0.273 0.091 0.000 0.000 0.000 0.000 0.000 0.501 WSW 0.002 0.182 0.455 0.045 0.000 0.045 0.000 0.000 0.000 0.729 W 0.002 0.045 0.591 0.818 0.227 0.091 0.000 0.000 0.000 1.775 WNW 0.001 0.045 0.318 0.182 0.227 0.136 0.045 0.000 0.000 0.956 NW 0.001 0.000 0.182 0.136 0.091 0.273 0.000 0.000 0.000 0.682 NNW 0.001 0.000 0.364 0.545 0.455 0.364 0.000 0.000 0.000 1.728 SUBTOTAL 0.045 1.636 13.409 10.045 3.227 1.455 0.045 0.000 0.000 29.864 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS E 657 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 657 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 3.79 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 69 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.227 1.364 0.182 0.000 0.000 0.000 0.000 0.000 1.773 NNE 0.000 0.273 0.409 0.273 0.045 0.000 0.000 0.000 0.000 1.000 NE 0.000 0.091 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.273 ENE 0.000 0.182 0.818 0.182 0.045 0.000 0.000 0.000 0.000 1.227 E 0.000 0.091 2.136 0.545 0.000 0.000 0.000 0.000 0.000 2.773 ESE 0.000 0.273 1.318 0.318 0.000 0.000 0.000 0.000 0.000 1.909 SE 0.000 0.273 1.091 0.045 0.000 0.000 0.000 0.000 0.000 1.409 SSE 0.000 0.182 1.136 0.500 0.273 0.000 0.000 0.000 0.000 2.091 S 0.000 0.045 0.091 0.000 0.091 0.000 0.000 0.000 0.000 0.227 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.045 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.136 WSW 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.182 W 0.000 0.000 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.136 WNW 0.000 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.182 NW 0.000 0.136 0.091 0.000 0.045 0.000 0.000 0.000 0.000 0.273 NNW 0.000 0.091 0.636 0.136 0.045 0.000 0.000 0.000 0.000 0.909 SUBTOTAL 0.000 2.091 9.591 2.273 0.545 0.000 0.000 0.000 0.000 14.500 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS F 319 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 319 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 2.61 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 70 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.019 1.227 1.500 0.455 0.000 0.000 0.000 0.000 0.000 3.201 NNE 0.017 1.545 0.864 0.318 0.000 0.000 0.000 0.000 0.000 2.744 NE 0.012 0.864 0.818 0.045 0.000 0.000 0.000 0.000 0.000 1.739 ENE 0.010 0.409 0.955 0.136 0.045 0.000 0.000 0.000 0.000 1.555 E 0.008 0.364 0.818 0.000 0.000 0.000 0.000 0.000 0.000 1.190 ESE 0.008 0.318 0.818 0.000 0.000 0.000 0.000 0.000 0.000 1.144 SE 0.005 0.227 0.500 0.000 0.000 0.000 0.000 0.000 0.000 0.732 SSE 0.005 0.136 0.636 0.409 0.000 0.000 0.000 0.000 0.000 1.187 S 0.001 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.137 SSW 0.001 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.183 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.001 0.045 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.092 WNW 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NW 0.001 0.182 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.183 NNW 0.003 0.273 0.091 0.091 0.000 0.000 0.000 0.000 0.000 0.457 SUBTOTAL 0.091 5.909 7.091 1.455 0.045 0.000 0.000 0.000 0.000 14.591 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS G 321 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 321 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 2 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND SPEED AND DIRECTION MEASURED AT 10.50 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 1.95 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 71 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 7A 1st Quarter JFD Split Level Releases Joint Frequency Distribution In Percent (Ground Level Release Mode and Elevated Release Mode)

Page 72 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.005 0.006 0.000 0.000 0.000 0.011 NNE 0.000 0.000 0.000 0.000 0.000 0.050 0.000 0.000 0.000 0.050 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.004 0.075 0.015 0.000 0.000 0.000 0.000 0.094 SSE 0.000 0.000 0.022 0.059 0.009 0.000 0.000 0.000 0.000 0.090 S 0.000 0.000 0.008 0.019 0.000 0.000 0.000 0.000 0.000 0.027 SSW 0.000 0.000 0.005 0.004 0.000 0.000 0.000 0.000 0.000 0.008 SW 0.000 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.006 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.009 0.000 0.000 0.000 0.009 WNW 0.000 0.000 0.000 0.000 0.000 0.016 0.016 0.000 0.000 0.032 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.076 0.000 0.000 0.076 NNW 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.005 SUBTOTAL 0.000 0.000 0.038 0.163 0.034 0.081 0.092 0.000 0.000 0.408 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS A 12.330 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS A 8.870 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 73 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.018 0.013 0.000 0.000 0.000 0.031 NNE 0.000 0.000 0.000 0.000 0.017 0.030 0.000 0.000 0.000 0.047 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.004 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.020 0.000 0.000 0.000 0.000 0.000 0.020 SSE 0.000 0.000 0.007 0.006 0.000 0.000 0.000 0.000 0.000 0.013 S 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.000 0.003 SSW 0.000 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.006 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.005 0.000 0.020 0.000 0.000 0.000 0.025 WNW 0.000 0.000 0.000 0.000 0.000 0.039 0.026 0.000 0.000 0.065 NW 0.000 0.000 0.000 0.000 0.000 0.015 0.057 0.000 0.000 0.072 NNW 0.000 0.000 0.000 0.000 0.003 0.017 0.000 0.000 0.000 0.020 SUBTOTAL 0.000 0.000 0.010 0.039 0.042 0.134 0.083 0.000 0.000 0.308 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS B 22.340 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS B 6.690 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 74 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.004 0.029 0.006 0.000 0.000 0.000 0.039 NNE 0.000 0.000 0.000 0.000 0.004 0.007 0.000 0.000 0.000 0.011 NE 0.000 0.000 0.000 0.000 0.006 0.006 0.000 0.000 0.000 0.013 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.010 0.034 0.000 0.000 0.000 0.000 0.000 0.044 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.004 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.006 WSW 0.000 0.000 0.000 0.000 0.007 0.017 0.000 0.000 0.000 0.024 W 0.000 0.000 0.000 0.000 0.000 0.014 0.000 0.000 0.000 0.014 WNW 0.000 0.000 0.000 0.000 0.000 0.046 0.038 0.000 0.000 0.084 NW 0.000 0.000 0.000 0.000 0.000 0.045 0.056 0.000 0.000 0.101 NNW 0.000 0.000 0.000 0.000 0.011 0.000 0.018 0.000 0.000 0.029 SUBTOTAL 0.000 0.000 0.014 0.043 0.057 0.141 0.112 0.000 0.000 0.368 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS C 59.900 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS C 7.990 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 75 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.038 0.224 0.110 0.000 0.000 0.000 0.372 NNE 0.000 0.000 0.002 0.032 0.142 0.240 0.000 0.000 0.000 0.416 NE 0.000 0.000 0.000 0.024 0.063 0.116 0.000 0.000 0.000 0.203 ENE 0.000 0.000 0.000 0.005 0.002 0.000 0.000 0.000 0.000 0.007 E 0.000 0.000 0.000 0.002 0.005 0.000 0.000 0.000 0.000 0.007 ESE 0.000 0.000 0.009 0.044 0.000 0.000 0.000 0.000 0.000 0.052 SE 0.000 0.000 0.031 0.141 0.025 0.000 0.000 0.000 0.000 0.197 SSE 0.000 0.000 0.091 0.117 0.049 0.000 0.000 0.000 0.000 0.257 S 0.000 0.000 0.022 0.007 0.034 0.000 0.000 0.000 0.000 0.063 SSW 0.000 0.000 0.027 0.028 0.000 0.000 0.000 0.000 0.000 0.055 SW 0.000 0.000 0.010 0.006 0.000 0.000 0.000 0.000 0.000 0.016 WSW 0.000 0.000 0.004 0.035 0.064 0.009 0.000 0.000 0.000 0.112 W 0.000 0.000 0.009 0.049 0.136 0.097 0.000 0.000 0.000 0.290 WNW 0.000 0.000 0.000 0.005 0.040 0.207 0.156 0.074 0.000 0.482 NW 0.000 0.000 0.000 0.007 0.050 0.277 0.351 0.082 0.000 0.767 NNW 0.000 0.000 0.000 0.002 0.081 0.247 0.035 0.000 0.000 0.365 SUBTOTAL 0.000 0.000 0.204 0.543 0.916 1.302 0.543 0.155 0.000 3.663 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS D 792.060 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS D 79.640 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 76 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.017 0.040 0.105 0.027 0.000 0.000 0.000 0.189 NNE 0.000 0.000 0.014 0.068 0.081 0.052 0.000 0.000 0.000 0.216 NE 0.000 0.000 0.004 0.044 0.034 0.037 0.018 0.000 0.000 0.137 ENE 0.000 0.000 0.000 0.015 0.023 0.006 0.000 0.000 0.000 0.044 E 0.000 0.000 0.029 0.026 0.006 0.000 0.000 0.000 0.000 0.061 ESE 0.000 0.005 0.120 0.060 0.041 0.000 0.000 0.000 0.000 0.226 SE 0.000 0.016 0.236 0.089 0.013 0.000 0.000 0.000 0.000 0.354 SSE 0.000 0.017 0.325 0.420 0.196 0.000 0.000 0.000 0.000 0.957 S 0.000 0.009 0.177 0.260 0.274 0.040 0.000 0.000 0.000 0.759 SSW 0.000 0.000 0.034 0.067 0.019 0.000 0.000 0.000 0.000 0.120 SW 0.000 0.000 0.028 0.008 0.000 0.000 0.000 0.000 0.000 0.036 WSW 0.000 0.000 0.035 0.053 0.007 0.000 0.000 0.000 0.000 0.096 W 0.000 0.000 0.029 0.064 0.049 0.017 0.018 0.000 0.000 0.177 WNW 0.000 0.000 0.014 0.033 0.043 0.068 0.075 0.000 0.000 0.231 NW 0.000 0.000 0.002 0.017 0.020 0.116 0.106 0.000 0.000 0.263 NNW 0.000 0.000 0.021 0.052 0.021 0.048 0.000 0.000 0.000 0.142 SUBTOTAL 0.000 0.046 1.086 1.316 0.934 0.410 0.218 0.000 0.000 4.009 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS E 963.170 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS E 87.150 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 77 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.026 0.020 0.008 0.000 0.000 0.000 0.000 0.054 NNE 0.000 0.000 0.021 0.008 0.015 0.008 0.000 0.000 0.000 0.052 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.022 0.003 0.000 0.000 0.000 0.000 0.000 0.025 E 0.000 0.000 0.045 0.014 0.000 0.000 0.000 0.000 0.000 0.059 ESE 0.000 0.017 0.123 0.026 0.000 0.000 0.000 0.000 0.000 0.166 SE 0.000 0.025 0.070 0.058 0.000 0.000 0.000 0.000 0.000 0.153 SSE 0.001 0.015 0.508 0.310 0.090 0.138 0.000 0.000 0.000 1.062 S 0.001 0.011 0.244 0.505 0.316 0.092 0.000 0.000 0.000 1.168 SSW 0.000 0.001 0.009 0.042 0.030 0.078 0.000 0.000 0.000 0.161 SW 0.000 0.006 0.019 0.000 0.000 0.000 0.000 0.000 0.000 0.025 WSW 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.000 0.006 W 0.000 0.000 0.004 0.000 0.008 0.010 0.000 0.000 0.000 0.022 WNW 0.000 0.000 0.006 0.005 0.013 0.000 0.000 0.000 0.000 0.023 NW 0.000 0.000 0.012 0.006 0.000 0.000 0.009 0.000 0.000 0.027 NNW 0.000 0.000 0.021 0.014 0.000 0.000 0.000 0.000 0.000 0.035 SUBTOTAL 0.003 0.074 1.137 1.011 0.479 0.326 0.009 0.000 0.000 3.039 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS F 280.020 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS F 66.060 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBES Page 78 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.011 0.000 0.000 0.000 0.000 0.000 0.000 0.011 NNE 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.000 0.003 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.005 0.001 0.000 0.000 0.000 0.000 0.000 0.006 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 SE 0.000 0.043 0.072 0.000 0.000 0.000 0.000 0.000 0.000 0.115 SSE 0.000 0.025 0.479 0.272 0.091 0.000 0.000 0.000 0.000 0.867 S 0.000 0.000 0.109 0.030 0.013 0.000 0.000 0.000 0.000 0.153 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.009 0.000 0.000 0.000 0.000 0.009 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.007 0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.012 NNW 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.004 SUBTOTAL 0.000 0.082 0.687 0.304 0.113 0.000 0.000 0.000 0.000 1.186 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF GROUND LEVEL RELEASE 282.180 TOTAL HOURS OF STABILITY CLASS G 44.180 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS G 25.780 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 79 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.038 0.000 0.000 0.038 SSE 0.000 0.000 0.000 0.000 0.000 0.080 0.000 0.000 0.000 0.080 S 0.000 0.000 0.000 0.000 0.000 0.041 0.000 0.000 0.000 0.041 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.000 0.121 0.038 0.000 0.000 0.159 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS A 12.330 TOTAL HOURS OF ELEVATED STABILITY CLASS A 3.460 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER Page 80 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.040 0.000 0.000 0.000 0.040 NNE 0.000 0.000 0.000 0.000 0.000 0.080 0.037 0.000 0.000 0.117 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.040 0.000 0.000 0.000 0.040 SE 0.000 0.000 0.000 0.000 0.086 0.000 0.000 0.000 0.000 0.086 SSE 0.000 0.000 0.000 0.000 0.000 0.083 0.075 0.000 0.000 0.158 S 0.000 0.000 0.000 0.000 0.000 0.080 0.000 0.000 0.000 0.080 SSW 0.000 0.000 0.000 0.000 0.043 0.042 0.000 0.000 0.000 0.085 SW 0.000 0.000 0.000 0.000 0.043 0.000 0.000 0.000 0.000 0.043 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.037 0.000 0.000 0.037 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.034 0.000 0.034 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.172 0.365 0.149 0.034 0.000 0.720 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS B 22.340 TOTAL HOURS OF ELEVATED STABILITY CLASS B 15.650 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 81 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.043 0.448 0.000 0.000 0.000 0.491 NNE 0.000 0.000 0.000 0.000 0.043 0.163 0.075 0.000 0.000 0.281 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.091 0.080 0.000 0.000 0.000 0.171 SE 0.000 0.000 0.000 0.000 0.091 0.042 0.000 0.000 0.000 0.133 SSE 0.000 0.000 0.000 0.046 0.046 0.000 0.038 0.000 0.000 0.130 S 0.000 0.000 0.000 0.092 0.000 0.080 0.037 0.000 0.000 0.209 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.041 0.000 0.000 0.000 0.041 WSW 0.000 0.000 0.000 0.000 0.000 0.041 0.000 0.000 0.000 0.041 W 0.000 0.000 0.000 0.000 0.000 0.121 0.149 0.000 0.000 0.270 WNW 0.000 0.000 0.000 0.000 0.000 0.121 0.075 0.030 0.000 0.226 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.184 0.169 0.000 0.353 NNW 0.000 0.000 0.000 0.000 0.000 0.041 0.000 0.000 0.000 0.041 SUBTOTAL 0.000 0.000 0.000 0.138 0.313 1.178 0.559 0.199 0.000 2.388 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS C 59.900 TOTAL HOURS OF ELEVATED STABILITY CLASS C 51.910 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER Page 82 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.092 0.230 0.087 2.153 1.243 0.027 0.000 3.831 NNE 0.000 0.000 0.276 0.230 0.444 1.995 0.793 0.000 0.000 3.738 NE 0.000 0.000 0.092 0.322 0.663 1.014 0.038 0.000 0.000 2.129 ENE 0.000 0.000 0.230 0.138 0.222 0.041 0.000 0.000 0.000 0.631 E 0.000 0.000 0.092 0.230 0.092 0.083 0.000 0.000 0.000 0.497 ESE 0.000 0.000 0.092 0.460 0.352 0.366 0.076 0.000 0.000 1.345 SE 0.000 0.000 0.046 0.414 0.315 0.321 0.898 0.035 0.000 2.028 SSE 0.000 0.000 0.138 0.552 0.315 0.518 0.339 0.172 0.026 2.060 S 0.000 0.000 0.414 0.322 0.265 0.567 0.076 0.129 0.000 1.773 SSW 0.000 0.000 0.138 0.230 0.175 0.240 0.110 0.000 0.000 0.893 SW 0.000 0.000 0.184 0.276 0.000 0.448 0.000 0.000 0.000 0.908 WSW 0.000 0.000 0.184 0.276 0.310 0.845 0.189 0.000 0.000 1.803 W 0.000 0.000 0.092 0.184 0.258 1.774 0.747 0.000 0.000 3.055 WNW 0.000 0.000 0.092 0.276 0.265 1.363 1.043 0.235 0.029 3.303 NW 0.000 0.000 0.046 0.000 0.046 0.996 1.453 0.465 0.000 3.006 NNW 0.000 0.000 0.138 0.046 0.087 0.682 0.787 0.030 0.000 1.770 SUBTOTAL 0.000 0.000 2.346 4.186 3.894 13.405 7.792 1.093 0.054 32.770 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS D 792.060 TOTAL HOURS OF ELEVATED STABILITY CLASS D 712.420 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER Page 83 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.138 0.046 0.173 0.854 0.301 0.000 0.000 1.512 NNE 0.000 0.000 0.184 0.414 0.270 0.651 0.262 0.000 0.000 1.781 NE 0.000 0.000 0.184 0.322 0.798 0.564 0.038 0.000 0.000 1.907 ENE 0.000 0.000 0.092 0.276 0.315 0.285 0.037 0.000 0.000 1.005 E 0.000 0.000 0.138 0.276 0.132 0.081 0.000 0.000 0.000 0.628 ESE 0.000 0.000 0.138 0.414 0.928 0.457 0.114 0.000 0.000 2.050 SE 0.000 0.000 0.230 0.460 0.927 2.251 1.127 0.320 0.010 5.325 SSE 0.000 0.000 0.184 0.322 0.888 1.406 1.315 0.336 0.004 4.454 S 0.000 0.046 0.138 0.506 0.748 1.487 2.457 0.816 0.012 6.211 SSW 0.000 0.000 0.230 0.552 0.263 1.745 1.723 0.356 0.006 4.874 SW 0.000 0.046 0.092 0.690 0.397 0.770 0.038 0.000 0.000 2.034 WSW 0.000 0.046 0.046 0.874 0.533 0.657 0.076 0.036 0.000 2.268 W 0.000 0.000 0.000 0.460 0.793 0.860 0.186 0.028 0.000 2.327 WNW 0.000 0.000 0.184 0.138 0.221 0.606 0.300 0.000 0.000 1.449 NW 0.000 0.000 0.046 0.092 0.441 0.246 0.263 0.086 0.000 1.173 NNW 0.000 0.000 0.046 0.184 0.309 0.646 0.113 0.000 0.000 1.298 SUBTOTAL 0.000 0.138 2.070 6.026 8.136 13.567 8.350 1.977 0.032 40.295 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS E 963.170 TOTAL HOURS OF ELEVATED STABILITY CLASS E 876.020 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER Page 84 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.092 0.000 0.043 0.042 0.000 0.000 0.000 0.178 NNE 0.000 0.000 0.092 0.046 0.086 0.000 0.000 0.000 0.000 0.224 NE 0.000 0.000 0.000 0.276 0.134 0.000 0.000 0.000 0.000 0.410 ENE 0.000 0.046 0.092 0.184 0.000 0.040 0.000 0.000 0.000 0.362 E 0.000 0.000 0.000 0.092 0.089 0.042 0.000 0.000 0.000 0.223 ESE 0.000 0.000 0.000 0.046 0.224 0.370 0.000 0.000 0.000 0.640 SE 0.000 0.000 0.046 0.046 0.134 0.966 0.401 0.232 0.010 1.835 SSE 0.000 0.000 0.000 0.046 0.132 0.517 0.823 0.250 0.009 1.777 S 0.000 0.000 0.000 0.230 0.304 0.723 0.786 0.137 0.005 2.184 SSW 0.000 0.000 0.092 0.138 0.088 0.200 0.075 0.000 0.000 0.592 SW 0.000 0.000 0.092 0.000 0.000 0.000 0.037 0.000 0.000 0.129 WSW 0.000 0.000 0.046 0.138 0.000 0.000 0.000 0.000 0.000 0.184 W 0.000 0.000 0.046 0.000 0.088 0.085 0.000 0.000 0.000 0.219 WNW 0.000 0.000 0.092 0.000 0.043 0.124 0.000 0.000 0.000 0.259 NW 0.000 0.000 0.046 0.046 0.178 0.043 0.000 0.000 0.000 0.313 NNW 0.000 0.000 0.000 0.184 0.046 0.083 0.000 0.000 0.000 0.312 SUBTOTAL 0.000 0.046 0.736 1.472 1.589 3.234 2.123 0.618 0.024 9.842 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS F 280.020 TOTAL HOURS OF ELEVATED STABILITY CLASS F 213.960 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBER Page 85 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.046 0.000 0.040 0.000 0.000 0.000 0.086 NNE 0.000 0.000 0.000 0.000 0.045 0.043 0.000 0.000 0.000 0.088 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.000 0.000 0.000 0.089 0.000 0.000 0.000 0.000 0.089 SE 0.000 0.000 0.092 0.000 0.046 0.000 0.000 0.000 0.000 0.138 SSE 0.000 0.000 0.092 0.000 0.000 0.000 0.110 0.000 0.000 0.202 S 0.000 0.000 0.000 0.000 0.000 0.000 0.151 0.000 0.000 0.151 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.276 0.046 0.180 0.083 0.262 0.000 0.000 0.846 TOTAL HOURS OF VALID OBSERVATIONS 2174.000 TOTAL HOURS OF ELEVATED RELEASES 1891.820 TOTAL HOURS OF STABILITY CLASS G 44.180 TOTAL HOURS OF ELEVATED STABILITY CLASS G 18.400 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/05/05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 86 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 7B 2nd Quarter JFD Split Level Releases Joint Frequency Distribution In Percent (Ground Level Release Mode and Elevated Release Mode)

Page 87 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.071 0.000 0.000 0.000 0.071 NNE 0.000 0.000 0.000 0.000 0.000 0.008 0.000 0.000 0.000 0.008 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.000 0.005 ESE 0.000 0.000 0.022 0.027 0.000 0.000 0.000 0.000 0.000 0.049 SE 0.000 0.000 0.041 0.027 0.000 0.000 0.000 0.000 0.000 0.069 SSE 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 S 0.000 0.000 0.038 0.009 0.000 0.000 0.000 0.000 0.000 0.047 SSW 0.000 0.000 0.004 0.008 0.000 0.000 0.000 0.000 0.000 0.011 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.069 0.064 0.000 0.133 NNW 0.000 0.000 0.000 0.000 0.000 0.035 0.022 0.000 0.000 0.058 SUBTOTAL 0.000 0.000 0.152 0.077 0.000 0.115 0.092 0.064 0.000 0.498 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS A 18.190 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS A 10.880 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 88 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.038 0.000 0.000 0.000 0.038 NNE 0.000 0.000 0.000 0.000 0.007 0.066 0.000 0.000 0.000 0.073 NE 0.000 0.000 0.000 0.000 0.000 0.025 0.000 0.000 0.000 0.025 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.008 0.047 0.000 0.000 0.000 0.000 0.000 0.055 SE 0.000 0.000 0.021 0.008 0.000 0.000 0.000 0.000 0.000 0.029 SSE 0.000 0.000 0.028 0.003 0.000 0.000 0.000 0.000 0.000 0.031 S 0.000 0.000 0.017 0.009 0.000 0.000 0.000 0.000 0.000 0.026 SSW 0.000 0.000 0.010 0.008 0.000 0.000 0.000 0.000 0.000 0.017 SW 0.000 0.000 0.011 0.005 0.000 0.000 0.000 0.000 0.000 0.016 WSW 0.000 0.000 0.003 0.008 0.000 0.000 0.000 0.000 0.000 0.011 W 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.005 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.032 0.000 0.000 0.032 NW 0.000 0.000 0.000 0.000 0.002 0.036 0.048 0.036 0.000 0.122 NNW 0.000 0.000 0.000 0.000 0.005 0.055 0.011 0.000 0.000 0.071 SUBTOTAL 0.000 0.000 0.098 0.088 0.018 0.221 0.091 0.036 0.000 0.552 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS B 43.410 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS B 12.050 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 89 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.001 0.010 0.038 0.000 0.000 0.000 0.048 NNE 0.000 0.000 0.000 0.000 0.024 0.044 0.000 0.000 0.000 0.069 NE 0.000 0.000 0.000 0.000 0.000 0.027 0.019 0.000 0.000 0.045 ENE 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.005 E 0.000 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.004 ESE 0.000 0.000 0.004 0.020 0.016 0.000 0.000 0.000 0.000 0.039 SE 0.000 0.000 0.019 0.000 0.000 0.000 0.000 0.000 0.000 0.019 SSE 0.000 0.000 0.011 0.000 0.000 0.000 0.000 0.000 0.000 0.011 S 0.000 0.000 0.032 0.000 0.000 0.000 0.000 0.000 0.000 0.032 SSW 0.000 0.000 0.008 0.017 0.000 0.000 0.000 0.000 0.000 0.025 SW 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.004 WSW 0.000 0.000 0.000 0.026 0.006 0.000 0.000 0.000 0.000 0.032 W 0.000 0.000 0.000 0.017 0.028 0.009 0.000 0.000 0.000 0.055 WNW 0.000 0.000 0.000 0.000 0.005 0.030 0.027 0.000 0.000 0.062 NW 0.000 0.000 0.000 0.000 0.003 0.044 0.101 0.000 0.000 0.148 NNW 0.000 0.000 0.000 0.000 0.018 0.024 0.000 0.000 0.000 0.042 SUBTOTAL 0.000 0.000 0.077 0.085 0.116 0.215 0.146 0.000 0.000 0.639 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS C 100.100 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS C 13.960 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 90 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.013 0.069 0.052 0.024 0.000 0.000 0.158 NNE 0.000 0.000 0.000 0.021 0.064 0.052 0.000 0.000 0.000 0.137 NE 0.000 0.000 0.000 0.002 0.034 0.057 0.000 0.000 0.000 0.093 ENE 0.000 0.000 0.000 0.004 0.004 0.006 0.000 0.000 0.000 0.014 E 0.000 0.000 0.026 0.086 0.037 0.010 0.000 0.000 0.000 0.158 ESE 0.000 0.000 0.109 0.186 0.045 0.019 0.000 0.000 0.000 0.359 SE 0.000 0.000 0.056 0.025 0.000 0.000 0.000 0.000 0.000 0.081 SSE 0.000 0.004 0.129 0.020 0.000 0.000 0.000 0.000 0.000 0.153 S 0.000 0.000 0.071 0.026 0.000 0.000 0.000 0.000 0.000 0.096 SSW 0.000 0.000 0.110 0.060 0.000 0.000 0.000 0.000 0.000 0.171 SW 0.000 0.000 0.027 0.019 0.000 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.006 0.049 0.020 0.025 0.000 0.000 0.000 0.101 W 0.000 0.000 0.006 0.102 0.109 0.164 0.022 0.000 0.000 0.404 WNW 0.000 0.000 0.009 0.005 0.048 0.208 0.235 0.000 0.000 0.505 NW 0.000 0.000 0.000 0.007 0.058 0.273 0.105 0.000 0.000 0.443 NNW 0.000 0.000 0.000 0.018 0.052 0.070 0.059 0.000 0.000 0.198 SUBTOTAL 0.000 0.004 0.550 0.642 0.540 0.936 0.445 0.000 0.000 3.117 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS D 971.540 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS D 68.040 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 91 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.051 0.058 0.024 0.008 0.000 0.000 0.000 0.142 NNE 0.000 0.000 0.033 0.062 0.016 0.009 0.000 0.000 0.000 0.119 NE 0.000 0.000 0.005 0.020 0.006 0.007 0.000 0.000 0.000 0.038 ENE 0.000 0.002 0.060 0.040 0.007 0.000 0.000 0.000 0.000 0.109 E 0.000 0.011 0.226 0.257 0.094 0.018 0.000 0.000 0.000 0.605 ESE 0.000 0.015 0.279 0.131 0.081 0.023 0.000 0.000 0.000 0.529 SE 0.000 0.007 0.078 0.050 0.000 0.000 0.000 0.000 0.000 0.136 SSE 0.000 0.008 0.138 0.030 0.000 0.000 0.000 0.000 0.000 0.176 S 0.000 0.006 0.126 0.015 0.000 0.000 0.000 0.000 0.000 0.148 SSW 0.000 0.005 0.079 0.037 0.000 0.000 0.000 0.000 0.000 0.121 SW 0.000 0.000 0.025 0.000 0.000 0.000 0.000 0.000 0.000 0.025 WSW 0.000 0.000 0.011 0.022 0.000 0.016 0.000 0.000 0.000 0.049 W 0.000 0.000 0.015 0.066 0.027 0.008 0.000 0.000 0.000 0.115 WNW 0.000 0.000 0.001 0.004 0.012 0.007 0.000 0.000 0.000 0.024 NW 0.000 0.000 0.007 0.016 0.037 0.033 0.000 0.000 0.000 0.093 NNW 0.000 0.000 0.032 0.055 0.065 0.093 0.026 0.000 0.000 0.269 SUBTOTAL 0.000 0.054 1.165 0.862 0.369 0.223 0.026 0.000 0.000 2.698 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS E 717.580 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS E 58.900 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 92 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.095 0.041 0.000 0.000 0.000 0.000 0.000 0.136 NNE 0.000 0.000 0.048 0.090 0.008 0.000 0.000 0.000 0.000 0.145 NE 0.000 0.006 0.022 0.004 0.000 0.000 0.000 0.000 0.000 0.032 ENE 0.000 0.010 0.025 0.012 0.000 0.000 0.000 0.000 0.000 0.047 E 0.000 0.014 0.101 0.022 0.008 0.000 0.000 0.000 0.000 0.145 ESE 0.000 0.019 0.045 0.036 0.009 0.000 0.000 0.000 0.000 0.109 SE 0.000 0.029 0.032 0.022 0.000 0.000 0.000 0.000 0.000 0.083 SSE 0.000 0.005 0.033 0.000 0.000 0.000 0.000 0.000 0.000 0.038 S 0.000 0.007 0.033 0.000 0.000 0.000 0.000 0.000 0.000 0.041 SSW 0.000 0.010 0.019 0.000 0.000 0.000 0.000 0.000 0.000 0.029 SW 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.004 WSW 0.000 0.000 0.004 0.007 0.000 0.000 0.000 0.000 0.000 0.011 W 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.001 WNW 0.000 0.000 0.004 0.004 0.000 0.008 0.000 0.000 0.000 0.016 NW 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.000 0.003 NNW 0.000 0.000 0.047 0.049 0.000 0.000 0.000 0.000 0.000 0.096 SUBTOTAL 0.000 0.101 0.517 0.285 0.025 0.008 0.000 0.000 0.000 0.936 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS F 253.260 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS F 20.430 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 93 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.016 0.071 0.021 0.000 0.000 0.000 0.000 0.000 0.109 NNE 0.000 0.004 0.027 0.008 0.000 0.000 0.000 0.000 0.000 0.039 NE 0.000 0.004 0.037 0.000 0.000 0.000 0.000 0.000 0.000 0.040 ENE 0.000 0.016 0.020 0.002 0.000 0.000 0.000 0.000 0.000 0.038 E 0.000 0.038 0.007 0.000 0.000 0.000 0.000 0.000 0.000 0.044 ESE 0.000 0.014 0.015 0.000 0.000 0.000 0.000 0.000 0.000 0.029 SE 0.000 0.025 0.013 0.000 0.000 0.000 0.000 0.000 0.000 0.038 SSE 0.000 0.001 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.005 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.007 0.000 0.008 0.000 0.000 0.000 0.000 0.000 0.015 WSW 0.000 0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.005 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.006 NW 0.000 0.005 0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.008 NNW 0.000 0.001 0.009 0.014 0.000 0.000 0.000 0.000 0.000 0.024 SUBTOTAL 0.000 0.135 0.205 0.053 0.006 0.000 0.000 0.000 0.000 0.399 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF GROUND LEVEL RELEASE 192.980 TOTAL HOURS OF STABILITY CLASS G 78.920 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS G 8.720 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 94 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.038 0.000 0.000 0.038 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.039 0.000 0.000 0.000 0.039 SSE 0.000 0.000 0.000 0.000 0.044 0.083 0.000 0.000 0.000 0.128 S 0.000 0.000 0.000 0.000 0.045 0.039 0.000 0.000 0.000 0.084 SSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.046 0.089 0.162 0.038 0.000 0.000 0.335 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS A 18.190 TOTAL HOURS OF ELEVATED STABILITY CLASS A 7.310 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 95 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.273 0.113 0.000 0.000 0.387 NNE 0.000 0.000 0.000 0.000 0.000 0.079 0.038 0.000 0.000 0.116 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.046 0.043 0.122 0.000 0.000 0.000 0.211 SSE 0.000 0.000 0.000 0.046 0.044 0.000 0.000 0.000 0.000 0.089 S 0.000 0.000 0.000 0.092 0.134 0.043 0.000 0.000 0.000 0.268 SSW 0.000 0.000 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.137 SW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.046 0.000 0.000 0.037 0.034 0.000 0.116 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.038 0.027 0.000 0.066 SUBTOTAL 0.000 0.000 0.000 0.412 0.221 0.517 0.225 0.061 0.000 1.437 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS B 43.410 TOTAL HOURS OF ELEVATED STABILITY CLASS B 31.360 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 96 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.599 0.076 0.000 0.000 0.675 NNE 0.000 0.000 0.000 0.000 0.044 0.518 0.410 0.000 0.000 0.972 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.042 0.000 0.000 0.000 0.042 SE 0.000 0.000 0.000 0.046 0.220 0.325 0.000 0.000 0.000 0.591 SSE 0.000 0.000 0.000 0.000 0.000 0.041 0.038 0.000 0.000 0.079 S 0.000 0.000 0.000 0.092 0.131 0.125 0.000 0.000 0.000 0.348 SSW 0.000 0.000 0.000 0.137 0.000 0.082 0.038 0.000 0.000 0.258 SW 0.000 0.000 0.000 0.046 0.131 0.042 0.000 0.000 0.000 0.219 WSW 0.000 0.000 0.000 0.000 0.044 0.000 0.000 0.000 0.000 0.044 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.074 0.069 0.000 0.142 NW 0.000 0.000 0.000 0.000 0.000 0.079 0.111 0.072 0.010 0.273 NNW 0.000 0.000 0.000 0.000 0.000 0.242 0.038 0.023 0.000 0.303 SUBTOTAL 0.000 0.000 0.000 0.321 0.570 2.096 0.786 0.164 0.010 3.946 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS C 100.100 TOTAL HOURS OF ELEVATED STABILITY CLASS C 86.140 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 97 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.183 0.183 0.395 0.481 0.297 0.050 0.000 1.590 NNE 0.000 0.000 0.046 0.183 0.663 0.838 0.189 0.000 0.000 1.919 NE 0.000 0.000 0.092 0.137 0.175 0.370 0.000 0.000 0.000 0.773 ENE 0.000 0.000 0.137 0.137 0.177 0.081 0.000 0.000 0.000 0.532 E 0.000 0.000 0.183 0.183 0.044 0.082 0.000 0.000 0.000 0.493 ESE 0.000 0.000 0.092 0.412 0.396 0.765 0.150 0.036 0.000 1.851 SE 0.000 0.000 0.229 0.870 0.798 1.157 0.747 0.130 0.000 3.932 SSE 0.000 0.000 0.504 0.916 0.304 0.737 0.707 0.036 0.008 3.212 S 0.000 0.046 0.641 1.237 0.568 1.165 0.965 0.030 0.000 4.652 SSW 0.000 0.000 0.412 0.825 0.485 0.921 0.524 0.066 0.000 3.233 SW 0.000 0.046 0.641 1.420 0.397 0.656 0.076 0.000 0.000 3.237 WSW 0.000 0.000 0.229 0.916 0.624 1.268 0.075 0.055 0.000 3.167 W 0.000 0.000 0.137 0.962 0.895 1.126 0.597 0.052 0.000 3.769 WNW 0.000 0.000 0.046 0.504 0.574 1.200 1.038 0.312 0.000 3.675 NW 0.000 0.000 0.046 0.504 0.482 1.049 1.308 0.162 0.000 3.552 NNW 0.000 0.000 0.092 0.229 0.306 0.726 0.336 0.114 0.000 1.802 SUBTOTAL 0.000 0.092 3.710 9.620 7.285 12.620 7.009 1.044 0.008 41.388 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS D 971.540 TOTAL HOURS OF ELEVATED STABILITY CLASS D 903.500 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 98 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.183 0.412 0.310 0.771 0.150 0.000 0.000 1.827 NNE 0.000 0.000 0.092 0.137 0.265 1.122 0.150 0.000 0.000 1.767 NE 0.000 0.000 0.046 0.412 0.174 0.327 0.000 0.000 0.000 0.959 ENE 0.000 0.000 0.092 0.183 0.265 0.329 0.000 0.000 0.000 0.869 E 0.000 0.000 0.229 0.137 0.307 0.370 0.000 0.000 0.000 1.044 ESE 0.000 0.000 0.183 0.229 0.882 1.537 0.449 0.000 0.000 3.280 SE 0.000 0.000 0.229 0.550 1.271 2.097 0.861 0.118 0.000 5.125 SSE 0.000 0.000 0.229 0.504 0.617 1.205 0.414 0.169 0.000 3.138 S 0.000 0.000 0.275 0.733 0.311 0.917 0.520 0.053 0.000 2.808 SSW 0.000 0.000 0.275 0.275 0.351 0.933 0.189 0.000 0.000 2.023 SW 0.000 0.000 0.183 0.550 0.399 0.361 0.000 0.000 0.000 1.492 WSW 0.000 0.000 0.137 0.458 0.536 0.162 0.038 0.030 0.000 1.361 W 0.000 0.000 0.092 0.275 0.216 0.531 0.038 0.000 0.000 1.151 WNW 0.000 0.000 0.229 0.183 0.266 0.000 0.000 0.000 0.000 0.678 NW 0.000 0.000 0.046 0.092 0.307 0.563 0.038 0.000 0.000 1.044 NNW 0.000 0.000 0.046 0.183 0.267 0.719 0.373 0.020 0.000 1.607 SUBTOTAL 0.000 0.000 2.565 5.314 6.741 11.945 3.219 0.389 0.000 30.173 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS E 717.580 TOTAL HOURS OF ELEVATED STABILITY CLASS E 658.680 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 99 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.003 0.000 0.092 0.046 0.044 0.594 0.000 0.000 0.000 0.778 NNE 0.003 0.000 0.092 0.092 0.046 0.680 0.000 0.000 0.000 0.912 NE 0.000 0.000 0.000 0.092 0.131 0.326 0.000 0.000 0.000 0.549 ENE 0.002 0.000 0.046 0.183 0.399 0.368 0.000 0.000 0.000 0.998 E 0.003 0.000 0.092 0.092 0.392 0.080 0.000 0.000 0.000 0.658 ESE 0.005 0.000 0.137 0.229 0.310 0.043 0.000 0.000 0.000 0.724 SE 0.006 0.000 0.183 0.412 0.531 0.201 0.038 0.000 0.000 1.372 SSE 0.002 0.000 0.046 0.321 0.263 0.117 0.373 0.000 0.000 1.122 S 0.005 0.000 0.137 0.137 0.132 0.442 0.000 0.000 0.000 0.853 SSW 0.002 0.000 0.046 0.092 0.087 0.204 0.000 0.000 0.000 0.430 SW 0.002 0.000 0.046 0.046 0.090 0.000 0.038 0.000 0.000 0.221 WSW 0.002 0.000 0.046 0.000 0.000 0.084 0.000 0.000 0.000 0.131 W 0.005 0.046 0.092 0.092 0.045 0.000 0.000 0.000 0.000 0.279 WNW 0.002 0.000 0.046 0.183 0.088 0.082 0.038 0.000 0.000 0.438 NW 0.002 0.000 0.046 0.092 0.349 0.042 0.000 0.000 0.000 0.530 NNW 0.006 0.000 0.183 0.000 0.000 0.443 0.038 0.000 0.000 0.670 SUBTOTAL 0.046 0.046 1.328 2.107 2.907 3.706 0.525 0.000 0.000 10.666 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS F 253.260 TOTAL HOURS OF ELEVATED STABILITY CLASS F 232.830 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 100 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.137 NNE 0.000 0.000 0.000 0.137 0.133 0.158 0.152 0.000 0.000 0.581 NE 0.000 0.000 0.092 0.092 0.175 0.123 0.000 0.000 0.000 0.481 ENE 0.000 0.000 0.046 0.092 0.133 0.125 0.000 0.000 0.000 0.395 E 0.000 0.046 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.183 ESE 0.000 0.000 0.000 0.000 0.044 0.000 0.000 0.000 0.000 0.044 SE 0.000 0.000 0.046 0.000 0.000 0.124 0.000 0.000 0.000 0.169 SSE 0.000 0.000 0.000 0.046 0.133 0.000 0.000 0.000 0.000 0.179 S 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.092 SSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.137 0.000 0.000 0.000 0.000 0.000 0.000 0.137 WSW 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.137 W 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.092 WNW 0.000 0.046 0.046 0.000 0.043 0.000 0.000 0.000 0.000 0.135 NW 0.000 0.000 0.046 0.183 0.132 0.000 0.000 0.000 0.000 0.361 NNW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SUBTOTAL 0.000 0.183 0.779 0.779 0.793 0.530 0.152 0.000 0.000 3.216 TOTAL HOURS OF VALID OBSERVATIONS 2183.000 TOTAL HOURS OF ELEVATED RELEASES 1990.020 TOTAL HOURS OF STABILITY CLASS G 78.920 TOTAL HOURS OF ELEVATED STABILITY CLASS G 70.200 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/08/10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 101 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 7C 3rd Quarter JFD Split Level Releases Joint Frequency Distribution In Percent (Ground Level Release Mode And Elevated Release Mode)

Page 102 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.005 0.021 0.000 0.000 0.000 0.026 NNE 0.000 0.000 0.000 0.000 0.005 0.021 0.000 0.000 0.000 0.026 NE 0.000 0.000 0.000 0.000 0.000 0.013 0.000 0.000 0.000 0.013 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.005 0.009 0.000 0.000 0.000 0.000 0.000 0.014 ESE 0.000 0.000 0.037 0.059 0.009 0.000 0.000 0.000 0.000 0.105 SE 0.000 0.000 0.066 0.089 0.000 0.000 0.000 0.000 0.000 0.154 SSE 0.000 0.000 0.037 0.032 0.000 0.000 0.000 0.000 0.000 0.069 S 0.000 0.000 0.010 0.067 0.000 0.000 0.000 0.000 0.000 0.077 SSW 0.000 0.000 0.007 0.000 0.000 0.000 0.000 0.000 0.000 0.007 SW 0.000 0.000 0.016 0.007 0.000 0.000 0.000 0.000 0.000 0.023 WSW 0.000 0.000 0.010 0.006 0.015 0.000 0.000 0.000 0.000 0.030 W 0.000 0.000 0.000 0.011 0.051 0.055 0.000 0.000 0.000 0.116 WNW 0.000 0.000 0.000 0.000 0.017 0.072 0.000 0.000 0.000 0.089 NW 0.000 0.000 0.000 0.000 0.005 0.021 0.028 0.000 0.000 0.053 NNW 0.000 0.000 0.000 0.000 0.003 0.081 0.000 0.000 0.000 0.084 SUBTOTAL 0.000 0.000 0.187 0.279 0.109 0.284 0.028 0.000 0.000 0.887 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS A 57.220 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS A 19.430 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 103 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.003 NNE 0.000 0.000 0.000 0.000 0.005 0.015 0.000 0.000 0.000 0.020 NE 0.000 0.000 0.000 0.000 0.000 0.006 0.000 0.000 0.000 0.006 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.003 0.008 0.000 0.000 0.000 0.000 0.000 0.011 ESE 0.000 0.000 0.000 0.016 0.000 0.000 0.000 0.000 0.000 0.016 SE 0.000 0.000 0.002 0.003 0.000 0.000 0.000 0.000 0.000 0.005 SSE 0.000 0.000 0.004 0.004 0.000 0.000 0.000 0.000 0.000 0.008 S 0.000 0.000 0.004 0.020 0.000 0.000 0.000 0.000 0.000 0.023 SSW 0.000 0.000 0.000 0.023 0.000 0.000 0.000 0.000 0.000 0.023 SW 0.000 0.000 0.000 0.007 0.000 0.000 0.000 0.000 0.000 0.007 WSW 0.000 0.000 0.000 0.003 0.013 0.000 0.000 0.000 0.000 0.016 W 0.000 0.000 0.000 0.001 0.034 0.013 0.000 0.000 0.000 0.048 WNW 0.000 0.000 0.000 0.001 0.020 0.005 0.000 0.000 0.000 0.026 NW 0.000 0.000 0.000 0.000 0.002 0.015 0.000 0.000 0.000 0.018 NNW 0.000 0.000 0.000 0.000 0.006 0.048 0.000 0.000 0.000 0.054 SUBTOTAL 0.000 0.000 0.013 0.086 0.082 0.103 0.000 0.000 0.000 0.284 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS B 67.990 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS B 6.220 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 104 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.008 0.000 0.000 0.000 0.008 NNE 0.000 0.000 0.000 0.000 0.015 0.061 0.000 0.000 0.000 0.076 NE 0.000 0.000 0.000 0.000 0.007 0.000 0.000 0.000 0.000 0.007 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.009 0.000 0.000 0.000 0.000 0.009 ESE 0.000 0.000 0.010 0.010 0.008 0.000 0.000 0.000 0.000 0.027 SE 0.000 0.000 0.021 0.000 0.000 0.000 0.000 0.000 0.000 0.021 SSE 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.005 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.023 0.000 0.000 0.000 0.000 0.000 0.023 WSW 0.000 0.000 0.005 0.013 0.006 0.000 0.000 0.000 0.000 0.025 W 0.000 0.000 0.000 0.005 0.028 0.019 0.000 0.000 0.000 0.052 WNW 0.000 0.000 0.000 0.006 0.003 0.025 0.009 0.000 0.000 0.043 NW 0.000 0.000 0.000 0.000 0.003 0.022 0.009 0.000 0.000 0.035 NNW 0.000 0.000 0.000 0.000 0.006 0.016 0.000 0.000 0.000 0.021 SUBTOTAL 0.000 0.000 0.040 0.056 0.085 0.152 0.018 0.000 0.000 0.351 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS C 125.690 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS C 7.690 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 105 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.003 0.026 0.037 0.024 0.000 0.000 0.000 0.090 NNE 0.000 0.000 0.001 0.010 0.032 0.045 0.000 0.000 0.000 0.088 NE 0.000 0.000 0.000 0.005 0.053 0.023 0.010 0.000 0.000 0.091 ENE 0.000 0.000 0.005 0.002 0.024 0.005 0.000 0.000 0.000 0.037 E 0.000 0.000 0.000 0.055 0.066 0.015 0.000 0.000 0.000 0.136 ESE 0.000 0.000 0.024 0.071 0.000 0.008 0.000 0.000 0.000 0.103 SE 0.000 0.000 0.014 0.012 0.000 0.000 0.000 0.000 0.000 0.026 SSE 0.000 0.000 0.034 0.038 0.000 0.000 0.000 0.000 0.000 0.072 S 0.000 0.000 0.099 0.084 0.000 0.000 0.000 0.000 0.000 0.183 SSW 0.000 0.000 0.066 0.054 0.000 0.000 0.000 0.000 0.000 0.121 SW 0.000 0.000 0.008 0.010 0.000 0.000 0.000 0.000 0.000 0.017 WSW 0.000 0.000 0.013 0.026 0.000 0.008 0.000 0.000 0.000 0.047 W 0.000 0.000 0.011 0.035 0.053 0.008 0.000 0.000 0.000 0.107 WNW 0.000 0.000 0.000 0.004 0.010 0.063 0.000 0.000 0.000 0.076 NW 0.000 0.000 0.000 0.005 0.021 0.032 0.036 0.000 0.000 0.094 NNW 0.000 0.000 0.000 0.023 0.042 0.057 0.000 0.000 0.000 0.122 SUBTOTAL 0.000 0.000 0.279 0.457 0.338 0.289 0.045 0.000 0.000 1.409 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS D 893.680 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS D 30.850 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 106 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.100 0.116 0.021 0.008 0.000 0.000 0.000 0.245 NNE 0.000 0.000 0.035 0.126 0.112 0.078 0.000 0.000 0.000 0.351 NE 0.000 0.000 0.014 0.038 0.079 0.047 0.000 0.000 0.000 0.179 ENE 0.000 0.003 0.043 0.069 0.011 0.000 0.000 0.000 0.000 0.126 E 0.000 0.002 0.109 0.357 0.082 0.000 0.000 0.000 0.000 0.550 ESE 0.000 0.005 0.047 0.041 0.000 0.000 0.000 0.000 0.000 0.093 SE 0.000 0.000 0.035 0.000 0.000 0.000 0.000 0.000 0.000 0.035 SSE 0.000 0.017 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.067 S 0.000 0.003 0.065 0.036 0.000 0.000 0.000 0.000 0.000 0.104 SSW 0.000 0.013 0.015 0.000 0.000 0.000 0.000 0.000 0.000 0.027 SW 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.000 0.004 WSW 0.000 0.000 0.004 0.020 0.000 0.000 0.000 0.000 0.000 0.024 W 0.000 0.000 0.006 0.033 0.000 0.006 0.000 0.000 0.000 0.045 WNW 0.000 0.000 0.000 0.005 0.017 0.000 0.000 0.000 0.000 0.022 NW 0.000 0.000 0.004 0.006 0.012 0.000 0.000 0.000 0.000 0.022 NNW 0.000 0.000 0.028 0.047 0.022 0.017 0.000 0.000 0.000 0.115 SUBTOTAL 0.000 0.043 0.558 0.894 0.358 0.156 0.000 0.000 0.000 2.010 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS E 751.000 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS E 44.010 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 107 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.001 0.062 0.029 0.000 0.000 0.000 0.000 0.000 0.092 NNE 0.000 0.001 0.038 0.019 0.008 0.000 0.000 0.000 0.000 0.065 NE 0.000 0.000 0.022 0.008 0.014 0.000 0.000 0.000 0.000 0.044 ENE 0.000 0.001 0.040 0.043 0.000 0.000 0.000 0.000 0.000 0.084 E 0.000 0.000 0.044 0.085 0.000 0.000 0.000 0.000 0.000 0.129 ESE 0.000 0.013 0.008 0.009 0.000 0.000 0.000 0.000 0.000 0.030 SE 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.006 SSE 0.000 0.000 0.015 0.000 0.000 0.000 0.000 0.000 0.000 0.015 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.004 WNW 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.005 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.032 0.000 0.008 0.000 0.000 0.000 0.000 0.039 SUBTOTAL 0.000 0.022 0.259 0.197 0.034 0.000 0.000 0.000 0.000 0.513 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS F 249.450 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS F 11.230 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 108 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.002 0.093 0.027 0.000 0.000 0.000 0.000 0.000 0.122 NNE 0.000 0.003 0.021 0.011 0.000 0.000 0.000 0.000 0.000 0.035 NE 0.000 0.000 0.014 0.000 0.000 0.000 0.000 0.000 0.000 0.014 ENE 0.000 0.001 0.001 0.013 0.007 0.000 0.000 0.000 0.000 0.023 E 0.000 0.000 0.006 0.000 0.000 0.000 0.000 0.000 0.000 0.006 ESE 0.000 0.000 0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.005 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.002 0.010 0.000 0.000 0.000 0.000 0.000 0.000 0.012 SUBTOTAL 0.000 0.009 0.150 0.050 0.007 0.000 0.000 0.000 0.000 0.216 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF GROUND LEVEL RELEASE 124.170 TOTAL HOURS OF STABILITY CLASS G 44.970 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS G 4.740 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 109 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.038 0.038 0.000 0.000 0.076 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.262 0.440 0.037 0.000 0.000 0.739 SSE 0.000 0.000 0.000 0.091 0.348 0.202 0.038 0.000 0.000 0.679 S 0.000 0.000 0.000 0.000 0.043 0.038 0.000 0.033 0.000 0.115 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.040 0.000 0.000 0.000 0.040 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.039 0.000 0.000 0.000 0.039 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.037 0.000 0.000 0.037 SUBTOTAL 0.000 0.000 0.000 0.091 0.653 0.798 0.151 0.033 0.000 1.726 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS A 57.220 TOTAL HOURS OF ELEVATED STABILITY CLASS A 37.790 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 110 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.159 0.000 0.000 0.000 0.159 NNE 0.000 0.000 0.000 0.000 0.000 0.159 0.000 0.000 0.000 0.159 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.091 0.178 0.242 0.074 0.000 0.000 0.586 SSE 0.000 0.000 0.091 0.228 0.128 0.084 0.037 0.000 0.000 0.568 S 0.000 0.000 0.000 0.046 0.132 0.000 0.074 0.000 0.000 0.251 SSW 0.000 0.000 0.000 0.046 0.044 0.000 0.000 0.000 0.000 0.089 SW 0.000 0.000 0.000 0.000 0.132 0.081 0.000 0.000 0.000 0.213 WSW 0.000 0.000 0.000 0.000 0.000 0.201 0.000 0.000 0.000 0.201 W 0.000 0.000 0.000 0.000 0.000 0.285 0.038 0.000 0.000 0.323 WNW 0.000 0.000 0.000 0.000 0.000 0.077 0.000 0.000 0.000 0.077 NW 0.000 0.000 0.000 0.000 0.000 0.040 0.000 0.000 0.000 0.040 NNW 0.000 0.000 0.000 0.000 0.000 0.117 0.037 0.000 0.000 0.154 SUBTOTAL 0.000 0.000 0.091 0.411 0.613 1.445 0.260 0.000 0.000 2.821 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS B 67.990 TOTAL HOURS OF ELEVATED STABILITY CLASS B 61.770 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 111 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.122 0.037 0.000 0.000 0.159 NNE 0.000 0.000 0.000 0.000 0.000 0.120 0.037 0.000 0.000 0.157 NE 0.000 0.000 0.000 0.000 0.000 0.079 0.000 0.000 0.000 0.079 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.040 0.038 0.000 0.000 0.078 SE 0.000 0.000 0.000 0.183 0.347 0.286 0.074 0.000 0.000 0.890 SSE 0.000 0.000 0.000 0.365 0.483 0.042 0.037 0.000 0.000 0.927 S 0.000 0.000 0.046 0.320 0.045 0.083 0.000 0.000 0.000 0.493 SSW 0.000 0.000 0.046 0.137 0.175 0.077 0.000 0.000 0.000 0.435 SW 0.000 0.000 0.000 0.137 0.042 0.042 0.000 0.000 0.000 0.221 WSW 0.000 0.000 0.000 0.091 0.043 0.081 0.000 0.000 0.000 0.216 W 0.000 0.000 0.000 0.183 0.268 0.410 0.000 0.000 0.000 0.861 WNW 0.000 0.000 0.000 0.000 0.045 0.323 0.000 0.000 0.000 0.368 NW 0.000 0.000 0.000 0.000 0.043 0.000 0.037 0.028 0.000 0.109 NNW 0.000 0.000 0.000 0.000 0.085 0.237 0.075 0.000 0.000 0.396 SUBTOTAL 0.000 0.000 0.091 1.416 1.576 1.942 0.335 0.028 0.000 5.388 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS C 125.690 TOTAL HOURS OF ELEVATED STABILITY CLASS C 118.000 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 112 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.274 0.183 0.354 0.446 0.335 0.030 0.000 1.622 NNE 0.000 0.000 0.137 0.320 0.304 0.519 0.301 0.000 0.000 1.581 NE 0.000 0.000 0.137 0.274 0.346 0.368 0.036 0.000 0.000 1.161 ENE 0.000 0.000 0.091 0.137 0.263 0.207 0.000 0.000 0.000 0.699 E 0.000 0.046 0.183 0.320 0.224 0.248 0.000 0.000 0.000 1.020 ESE 0.000 0.000 0.228 0.457 0.488 0.809 0.038 0.000 0.000 2.020 SE 0.000 0.046 0.868 1.233 0.440 0.648 0.189 0.000 0.000 3.423 SSE 0.000 0.000 1.187 1.279 0.661 0.447 0.221 0.000 0.000 3.795 S 0.000 0.000 1.279 1.142 1.140 0.805 0.557 0.215 0.000 5.138 SSW 0.000 0.000 1.142 1.050 0.402 1.038 0.185 0.000 0.000 3.817 SW 0.000 0.000 1.142 1.233 0.437 0.375 0.000 0.000 0.000 3.186 WSW 0.000 0.000 0.731 2.100 0.489 0.518 0.000 0.000 0.000 3.837 W 0.000 0.000 0.183 1.689 0.922 0.608 0.075 0.000 0.000 3.478 WNW 0.000 0.000 0.183 0.274 0.351 0.915 0.150 0.000 0.000 1.872 NW 0.000 0.000 0.091 0.320 0.221 0.317 0.261 0.018 0.000 1.228 NNW 0.000 0.000 0.137 0.320 0.394 0.557 0.113 0.000 0.000 1.521 SUBTOTAL 0.000 0.091 7.991 12.329 7.436 8.828 2.461 0.263 0.000 39.399 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS D 893.680 TOTAL HOURS OF ELEVATED STABILITY CLASS D 862.830 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 113 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.183 0.411 0.836 1.486 0.188 0.000 0.000 3.104 NNE 0.000 0.000 0.228 0.502 0.480 1.575 0.416 0.000 0.000 3.202 NE 0.000 0.000 0.274 0.320 0.442 1.010 0.037 0.035 0.000 2.117 ENE 0.000 0.000 0.274 0.365 0.433 0.279 0.000 0.000 0.000 1.352 E 0.000 0.000 0.183 0.457 0.832 1.301 0.038 0.000 0.000 2.811 ESE 0.000 0.000 0.274 0.776 1.193 2.120 0.037 0.000 0.000 4.400 SE 0.000 0.000 0.274 0.685 0.394 0.777 0.113 0.000 0.000 2.243 SSE 0.000 0.046 0.365 0.959 0.837 0.162 0.074 0.000 0.000 2.443 S 0.000 0.000 0.137 1.050 0.568 0.682 0.150 0.000 0.000 2.587 SSW 0.000 0.000 0.411 0.731 0.267 0.203 0.113 0.000 0.000 1.725 SW 0.000 0.000 0.320 0.502 0.087 0.164 0.000 0.000 0.000 1.074 WSW 0.000 0.000 0.365 0.411 0.218 0.205 0.037 0.000 0.000 1.237 W 0.000 0.046 0.046 0.639 0.356 0.083 0.000 0.000 0.000 1.169 WNW 0.000 0.000 0.183 0.228 0.000 0.245 0.000 0.000 0.000 0.656 NW 0.000 0.000 0.274 0.228 0.222 0.083 0.000 0.000 0.000 0.807 NNW 0.000 0.000 0.137 0.183 0.399 0.564 0.037 0.036 0.000 1.356 SUBTOTAL 0.000 0.091 3.927 8.447 7.564 10.940 1.242 0.071 0.000 32.283 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS E 751.000 TOTAL HOURS OF ELEVATED STABILITY CLASS E 706.990 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 114 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.091 0.137 0.443 0.408 0.038 0.000 0.000 1.118 NNE 0.000 0.000 0.137 0.228 0.438 0.448 0.038 0.000 0.000 1.289 NE 0.000 0.000 0.228 0.365 0.442 0.405 0.000 0.000 0.000 1.441 ENE 0.000 0.046 0.137 0.502 0.349 0.320 0.000 0.000 0.000 1.354 E 0.000 0.046 0.228 0.228 0.221 0.206 0.000 0.000 0.000 0.930 ESE 0.000 0.046 0.091 0.137 0.179 0.777 0.000 0.000 0.000 1.229 SE 0.000 0.000 0.274 0.183 0.316 0.162 0.000 0.000 0.000 0.934 SSE 0.000 0.000 0.183 0.183 0.089 0.000 0.000 0.000 0.000 0.455 S 0.000 0.000 0.137 0.228 0.044 0.042 0.000 0.000 0.000 0.452 SSW 0.000 0.000 0.183 0.137 0.000 0.080 0.000 0.000 0.000 0.400 SW 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.000 0.091 WSW 0.000 0.000 0.091 0.046 0.045 0.000 0.000 0.000 0.000 0.182 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.091 0.000 0.041 0.000 0.000 0.000 0.132 NW 0.000 0.000 0.046 0.137 0.000 0.000 0.000 0.000 0.000 0.183 NNW 0.000 0.000 0.046 0.091 0.352 0.161 0.038 0.000 0.000 0.688 SUBTOTAL 0.000 0.137 1.963 2.694 2.920 3.050 0.114 0.000 0.000 10.878 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS F 249.450 TOTAL HOURS OF ELEVATED STABILITY CLASS F 238.220 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 115 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.046 0.000 0.200 0.000 0.000 0.000 0.246 NNE 0.000 0.000 0.000 0.137 0.044 0.317 0.000 0.000 0.000 0.498 NE 0.000 0.000 0.000 0.091 0.175 0.159 0.000 0.000 0.000 0.426 ENE 0.000 0.000 0.046 0.000 0.087 0.042 0.000 0.000 0.000 0.175 E 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.046 0.136 0.000 0.000 0.000 0.000 0.182 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.091 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.043 0.040 0.000 0.000 0.000 0.083 SUBTOTAL 0.000 0.000 0.137 0.457 0.485 0.758 0.000 0.000 0.000 1.837 TOTAL HOURS OF VALID OBSERVATIONS 2190.000 TOTAL HOURS OF ELEVATED RELEASES 2065.830 TOTAL HOURS OF STABILITY CLASS G 44.970 TOTAL HOURS OF ELEVATED STABILITY CLASS G 40.230 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2020/10/13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 116 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 7D 4th Quarter JFD Split Level Releases Joint Frequency Distribution In Percent (Ground Level Release Mode And Elevated Release Mode)

Page 117 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.007 0.007 0.000 0.000 0.000 0.014 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.014 0.000 0.000 0.000 0.000 0.000 0.014 SE 0.000 0.000 0.034 0.043 0.000 0.000 0.000 0.000 0.000 0.077 SSE 0.000 0.000 0.035 0.078 0.000 0.000 0.000 0.000 0.000 0.113 S 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.001 SSW 0.000 0.000 0.000 0.002 0.000 0.000 0.000 0.000 0.000 0.002 SW 0.000 0.000 0.000 0.004 0.000 0.000 0.000 0.000 0.000 0.004 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.009 0.000 0.000 0.000 0.009 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.020 0.000 0.000 0.020 NNW 0.000 0.000 0.000 0.000 0.000 0.015 0.009 0.000 0.000 0.024 SUBTOTAL 0.000 0.000 0.070 0.142 0.007 0.030 0.029 0.000 0.000 0.278 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS A 14.820 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS A 6.120 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 118 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.017 0.028 0.000 0.000 0.000 0.045 NNE 0.000 0.000 0.000 0.000 0.000 0.020 0.000 0.000 0.000 0.020 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.037 0.009 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.010 0.017 0.000 0.000 0.000 0.000 0.000 0.027 SSE 0.000 0.000 0.000 0.009 0.000 0.000 0.000 0.000 0.000 0.009 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.003 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.009 0.009 0.000 0.000 0.018 WNW 0.000 0.000 0.000 0.000 0.000 0.017 0.000 0.000 0.000 0.017 NW 0.000 0.000 0.000 0.000 0.000 0.005 0.000 0.000 0.000 0.005 NNW 0.000 0.000 0.000 0.000 0.019 0.042 0.080 0.000 0.000 0.141 SUBTOTAL 0.000 0.000 0.010 0.065 0.045 0.120 0.090 0.000 0.000 0.330 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS B 21.230 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS B 7.260 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 119 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.001 0.024 0.013 0.000 0.000 0.000 0.038 NNE 0.000 0.000 0.000 0.000 0.005 0.019 0.000 0.000 0.000 0.024 NE 0.000 0.000 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.003 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.018 0.009 0.000 0.000 0.000 0.000 0.026 SE 0.000 0.000 0.001 0.004 0.000 0.000 0.000 0.000 0.000 0.005 SSE 0.000 0.000 0.022 0.003 0.000 0.000 0.000 0.000 0.000 0.025 S 0.000 0.000 0.004 0.009 0.000 0.000 0.000 0.000 0.000 0.013 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.008 0.007 0.000 0.000 0.000 0.000 0.015 W 0.000 0.000 0.000 0.000 0.000 0.008 0.010 0.000 0.000 0.017 WNW 0.000 0.000 0.000 0.000 0.004 0.041 0.008 0.000 0.000 0.053 NW 0.000 0.000 0.000 0.000 0.005 0.043 0.037 0.000 0.000 0.085 NNW 0.000 0.000 0.000 0.000 0.006 0.015 0.009 0.000 0.000 0.030 SUBTOTAL 0.000 0.000 0.027 0.042 0.064 0.139 0.064 0.000 0.000 0.335 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS C 52.010 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS C 7.380 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 120 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.082 0.132 0.081 0.000 0.000 0.000 0.296 NNE 0.000 0.000 0.001 0.068 0.110 0.030 0.070 0.000 0.000 0.280 NE 0.000 0.000 0.000 0.008 0.028 0.032 0.000 0.000 0.000 0.068 ENE 0.000 0.000 0.000 0.004 0.021 0.018 0.000 0.000 0.000 0.043 E 0.000 0.000 0.001 0.020 0.036 0.043 0.000 0.000 0.000 0.100 ESE 0.000 0.000 0.031 0.172 0.032 0.045 0.000 0.000 0.000 0.281 SE 0.000 0.000 0.056 0.050 0.000 0.000 0.000 0.000 0.000 0.106 SSE 0.000 0.000 0.041 0.040 0.000 0.000 0.000 0.000 0.000 0.081 S 0.000 0.000 0.017 0.000 0.000 0.000 0.000 0.000 0.000 0.017 SSW 0.000 0.000 0.008 0.007 0.000 0.000 0.000 0.000 0.000 0.015 SW 0.000 0.000 0.002 0.002 0.000 0.000 0.000 0.000 0.000 0.004 WSW 0.000 0.000 0.004 0.041 0.014 0.016 0.000 0.000 0.000 0.075 W 0.000 0.000 0.002 0.043 0.080 0.141 0.009 0.000 0.000 0.275 WNW 0.000 0.000 0.001 0.007 0.034 0.092 0.345 0.036 0.000 0.515 NW 0.000 0.000 0.000 0.011 0.027 0.209 0.474 0.000 0.000 0.721 NNW 0.000 0.000 0.000 0.024 0.046 0.251 0.048 0.000 0.000 0.370 SUBTOTAL 0.000 0.000 0.165 0.580 0.561 0.959 0.946 0.036 0.000 3.247 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS D 849.430 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS D 71.430 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 121 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.039 0.061 0.074 0.009 0.000 0.000 0.000 0.182 NNE 0.000 0.000 0.028 0.061 0.022 0.015 0.000 0.000 0.000 0.126 NE 0.000 0.000 0.000 0.035 0.033 0.017 0.000 0.000 0.000 0.085 ENE 0.000 0.000 0.020 0.037 0.030 0.032 0.000 0.000 0.000 0.120 E 0.000 0.000 0.119 0.157 0.048 0.016 0.000 0.000 0.000 0.340 ESE 0.000 0.001 0.210 0.370 0.062 0.000 0.000 0.000 0.000 0.643 SE 0.000 0.017 0.150 0.070 0.000 0.000 0.000 0.000 0.000 0.237 SSE 0.000 0.003 0.144 0.413 0.226 0.045 0.000 0.000 0.000 0.832 S 0.000 0.000 0.029 0.098 0.118 0.000 0.000 0.000 0.000 0.245 SSW 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.000 0.003 SW 0.000 0.000 0.005 0.011 0.000 0.000 0.000 0.000 0.000 0.016 WSW 0.000 0.003 0.011 0.004 0.000 0.008 0.000 0.000 0.000 0.025 W 0.000 0.001 0.022 0.078 0.029 0.016 0.000 0.000 0.000 0.145 WNW 0.000 0.000 0.007 0.012 0.028 0.024 0.009 0.000 0.000 0.081 NW 0.000 0.000 0.000 0.009 0.012 0.049 0.000 0.000 0.000 0.070 NNW 0.000 0.000 0.010 0.056 0.072 0.065 0.000 0.000 0.000 0.203 SUBTOTAL 0.000 0.025 0.796 1.471 0.753 0.297 0.009 0.000 0.000 3.352 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS E 728.640 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS E 73.750 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 122 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.001 0.125 0.025 0.000 0.000 0.000 0.000 0.000 0.152 NNE 0.000 0.000 0.031 0.032 0.008 0.000 0.000 0.000 0.000 0.071 NE 0.000 0.000 0.007 0.006 0.000 0.000 0.000 0.000 0.000 0.014 ENE 0.000 0.011 0.040 0.018 0.008 0.000 0.000 0.000 0.000 0.078 E 0.000 0.005 0.152 0.069 0.000 0.000 0.000 0.000 0.000 0.225 ESE 0.000 0.012 0.088 0.043 0.000 0.000 0.000 0.000 0.000 0.143 SE 0.000 0.011 0.145 0.007 0.000 0.000 0.000 0.000 0.000 0.163 SSE 0.000 0.005 0.141 0.147 0.192 0.000 0.000 0.000 0.000 0.485 S 0.000 0.002 0.006 0.000 0.049 0.000 0.000 0.000 0.000 0.056 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.002 0.008 0.000 0.000 0.000 0.000 0.000 0.010 WSW 0.000 0.000 0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.002 W 0.000 0.000 0.003 0.000 0.000 0.000 0.000 0.000 0.000 0.003 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.001 0.000 0.006 0.000 0.000 0.000 0.000 0.007 NNW 0.000 0.000 0.033 0.015 0.008 0.000 0.000 0.000 0.000 0.055 SUBTOTAL 0.000 0.048 0.777 0.370 0.270 0.000 0.000 0.000 0.000 1.465 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS F 345.190 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS F 32.240 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 123 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 1 OF 2 GROUND LEVEL RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.001 0.005 0.124 0.062 0.000 0.000 0.000 0.000 0.000 0.192 NNE 0.000 0.005 0.051 0.043 0.000 0.000 0.000 0.000 0.000 0.100 NE 0.000 0.004 0.023 0.007 0.000 0.000 0.000 0.000 0.000 0.035 ENE 0.000 0.010 0.032 0.012 0.008 0.000 0.000 0.000 0.000 0.062 E 0.000 0.003 0.044 0.000 0.000 0.000 0.000 0.000 0.000 0.048 ESE 0.001 0.011 0.052 0.000 0.000 0.000 0.000 0.000 0.000 0.064 SE 0.001 0.019 0.044 0.000 0.000 0.000 0.000 0.000 0.000 0.064 SSE 0.001 0.000 0.086 0.098 0.000 0.000 0.000 0.000 0.000 0.184 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.001 0.009 0.014 0.000 0.000 0.000 0.000 0.000 0.024 SUBTOTAL 0.005 0.059 0.465 0.235 0.008 0.000 0.000 0.000 0.000 0.772 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF GROUND LEVEL RELEASE 215.160 TOTAL HOURS OF STABILITY CLASS G 188.680 TOTAL HOURS OF GROUND LEVEL STABILITY CLASS G 16.980 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 45.30 METERS WIND DIRECTION MEASURED AT 10.50 METER LEVEL WIND SPEED MEASURED AT 10.50 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 124 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.116 0.000 0.000 0.000 0.116 SSE 0.000 0.000 0.000 0.000 0.044 0.080 0.112 0.000 0.000 0.236 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.043 0.000 0.000 0.000 0.000 0.043 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.087 0.197 0.112 0.000 0.000 0.395 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS A 14.820 TOTAL HOURS OF ELEVATED STABILITY CLASS A 8.700 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 125 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.044 0.040 0.037 0.000 0.000 0.121 SSE 0.000 0.000 0.000 0.000 0.180 0.041 0.075 0.000 0.000 0.296 S 0.000 0.000 0.000 0.091 0.044 0.000 0.038 0.000 0.000 0.173 SSW 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.045 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.091 0.314 0.081 0.150 0.000 0.000 0.635 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS B 21.230 TOTAL HOURS OF ELEVATED STABILITY CLASS B 13.970 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 126 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.275 0.000 0.000 0.000 0.275 NNE 0.000 0.000 0.000 0.000 0.000 0.156 0.000 0.000 0.000 0.156 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.121 0.000 0.000 0.000 0.121 SE 0.000 0.000 0.045 0.091 0.129 0.245 0.074 0.000 0.000 0.585 SSE 0.000 0.000 0.000 0.091 0.000 0.040 0.073 0.000 0.000 0.204 S 0.000 0.000 0.000 0.091 0.000 0.039 0.074 0.000 0.000 0.204 SSW 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 SW 0.000 0.000 0.000 0.000 0.087 0.041 0.000 0.000 0.000 0.129 WSW 0.000 0.000 0.000 0.000 0.042 0.000 0.000 0.000 0.000 0.042 W 0.000 0.000 0.000 0.000 0.000 0.000 0.110 0.000 0.000 0.110 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.039 0.074 0.000 0.000 0.113 SUBTOTAL 0.000 0.000 0.045 0.364 0.259 0.956 0.405 0.000 0.000 2.029 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS C 52.010 TOTAL HOURS OF ELEVATED STABILITY CLASS C 44.630 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 127 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.091 0.364 0.303 2.508 0.481 0.000 0.000 3.747 NNE 0.000 0.000 0.091 0.227 0.736 1.527 0.148 0.067 0.000 2.795 NE 0.000 0.045 0.000 0.273 0.264 0.321 0.036 0.000 0.000 0.939 ENE 0.000 0.000 0.227 0.091 0.312 0.084 0.000 0.000 0.000 0.715 E 0.000 0.000 0.045 0.318 0.089 0.122 0.146 0.000 0.000 0.720 ESE 0.000 0.000 0.136 0.636 0.520 0.845 0.000 0.000 0.000 2.137 SE 0.000 0.000 0.727 1.136 0.529 0.918 0.445 0.115 0.000 3.872 SSE 0.000 0.000 0.455 0.682 0.305 0.398 0.408 0.077 0.000 2.325 S 0.000 0.000 0.409 0.364 0.130 0.200 0.110 0.040 0.008 1.260 SSW 0.000 0.000 0.227 0.182 0.220 0.080 0.000 0.000 0.000 0.709 SW 0.000 0.045 0.500 0.409 0.130 0.040 0.000 0.000 0.000 1.125 WSW 0.000 0.000 0.182 0.773 0.173 0.525 0.297 0.042 0.000 1.991 W 0.000 0.000 0.136 0.591 0.792 1.161 0.405 0.000 0.000 3.086 WNW 0.000 0.000 0.227 0.409 0.437 0.722 1.104 0.292 0.010 3.201 NW 0.000 0.045 0.182 0.500 0.665 0.746 1.035 0.671 0.000 3.845 NNW 0.000 0.000 0.091 0.273 0.260 0.905 1.186 0.180 0.000 2.895 SUBTOTAL 0.000 0.136 3.727 7.227 5.866 11.101 5.804 1.485 0.017 35.364 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS D 849.430 TOTAL HOURS OF ELEVATED STABILITY CLASS D 778.000 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 128 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.045 0.136 0.182 0.437 1.164 0.187 0.000 0.000 2.152 NNE 0.000 0.000 0.091 0.136 0.609 0.568 0.038 0.000 0.000 1.442 NE 0.000 0.000 0.091 0.318 0.437 0.399 0.037 0.000 0.000 1.283 ENE 0.000 0.000 0.136 0.227 0.220 0.197 0.000 0.000 0.000 0.781 E 0.000 0.000 0.136 0.318 0.705 0.361 0.260 0.000 0.000 1.780 ESE 0.000 0.000 0.091 0.455 0.827 3.004 0.075 0.000 0.000 4.452 SE 0.000 0.000 0.273 0.500 0.394 2.903 1.261 0.125 0.000 5.456 SSE 0.000 0.000 0.136 0.545 0.530 0.792 1.105 0.539 0.034 3.681 S 0.000 0.000 0.091 0.318 0.261 0.243 0.476 0.324 0.000 1.714 SSW 0.000 0.000 0.045 0.318 0.309 0.438 0.111 0.030 0.000 1.251 SW 0.000 0.045 0.091 0.182 0.305 0.040 0.000 0.000 0.000 0.664 WSW 0.000 0.000 0.136 0.318 0.310 0.040 0.000 0.000 0.000 0.805 W 0.000 0.000 0.091 0.273 0.435 0.325 0.038 0.000 0.000 1.162 WNW 0.000 0.000 0.045 0.273 0.134 0.527 0.038 0.000 0.000 1.017 NW 0.000 0.000 0.045 0.091 0.401 0.357 0.148 0.000 0.000 1.042 NNW 0.000 0.045 0.000 0.091 0.130 0.595 0.224 0.000 0.000 1.085 SUBTOTAL 0.000 0.136 1.636 4.545 6.445 11.955 3.999 1.018 0.034 29.768 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS E 728.640 TOTAL HOURS OF ELEVATED STABILITY CLASS E 654.890 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 129 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.136 0.132 0.793 0.150 0.000 0.000 1.211 NNE 0.000 0.000 0.045 0.136 0.133 0.278 0.038 0.000 0.000 0.630 NE 0.000 0.000 0.091 0.136 0.177 0.161 0.000 0.000 0.000 0.565 ENE 0.000 0.000 0.091 0.136 0.263 0.233 0.038 0.000 0.000 0.761 E 0.000 0.000 0.091 0.182 0.394 0.411 0.000 0.000 0.000 1.078 ESE 0.000 0.000 0.045 0.273 0.699 0.855 0.000 0.000 0.000 1.872 SE 0.000 0.091 0.136 0.682 0.430 0.762 0.075 0.000 0.000 2.177 SSE 0.000 0.000 0.045 0.455 0.215 0.691 0.556 0.069 0.000 2.032 S 0.000 0.000 0.045 0.182 0.043 0.357 0.184 0.060 0.000 0.870 SSW 0.000 0.091 0.045 0.045 0.088 0.080 0.000 0.000 0.000 0.350 SW 0.000 0.000 0.136 0.045 0.043 0.000 0.000 0.000 0.000 0.225 WSW 0.000 0.000 0.227 0.227 0.088 0.000 0.000 0.000 0.000 0.543 W 0.000 0.000 0.182 0.227 0.177 0.040 0.000 0.000 0.000 0.626 WNW 0.000 0.000 0.091 0.227 0.000 0.000 0.000 0.000 0.000 0.318 NW 0.000 0.000 0.136 0.000 0.043 0.241 0.000 0.000 0.000 0.421 NNW 0.000 0.000 0.045 0.091 0.128 0.281 0.000 0.000 0.000 0.546 SUBTOTAL 0.000 0.182 1.455 3.182 3.054 5.184 1.041 0.129 0.000 14.225 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS F 345.190 TOTAL HOURS OF ELEVATED STABILITY CLASS F 312.950 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 130 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data SPLIT JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT PART 2 OF 2 ELEVATED RELEASE MODE OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.045 0.091 0.091 0.000 0.278 0.000 0.000 0.000 0.505 NNE 0.000 0.000 0.136 0.227 0.042 0.240 0.000 0.000 0.000 0.645 NE 0.000 0.000 0.045 0.364 0.000 0.242 0.000 0.000 0.000 0.651 ENE 0.000 0.000 0.045 0.091 0.263 0.358 0.038 0.000 0.000 0.795 E 0.000 0.000 0.000 0.000 0.305 0.206 0.000 0.000 0.000 0.511 ESE 0.000 0.000 0.091 0.182 0.308 0.042 0.000 0.000 0.000 0.622 SE 0.000 0.000 0.045 0.455 0.177 0.123 0.000 0.000 0.000 0.800 SSE 0.000 0.000 0.273 0.409 0.305 0.165 0.038 0.000 0.000 1.190 S 0.000 0.000 0.045 0.045 0.042 0.078 0.000 0.000 0.000 0.211 SSW 0.000 0.000 0.136 0.227 0.045 0.000 0.000 0.000 0.000 0.409 SW 0.000 0.000 0.318 0.091 0.000 0.000 0.000 0.000 0.000 0.409 WSW 0.000 0.045 0.136 0.000 0.000 0.000 0.000 0.000 0.000 0.182 W 0.000 0.045 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.182 WNW 0.000 0.000 0.136 0.045 0.000 0.000 0.000 0.000 0.000 0.182 NW 0.000 0.091 0.091 0.045 0.000 0.000 0.000 0.000 0.000 0.227 NNW 0.000 0.000 0.045 0.000 0.000 0.238 0.000 0.000 0.000 0.283 SUBTOTAL 0.000 0.227 1.727 2.318 1.487 1.969 0.075 0.000 0.000 7.805 TOTAL HOURS OF VALID OBSERVATIONS 2200.000 TOTAL HOURS OF ELEVATED RELEASES 1984.840 TOTAL HOURS OF STABILITY CLASS G 188.680 TOTAL HOURS OF ELEVATED STABILITY CLASS G 171.700 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND DIRECTION MEASURED AT 45.74 METER LEVEL WIND SPEED MEASURED AT 45.74 METER LEVEL EFFLUENT VELOCITY = 12.60 M/S DATE PRINTED: 2021/01/07 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 131 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 8A 1st Quarter JFD Elevated Releases Joint Frequency Distribution In Percent Page 132 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.092 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 S 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.000 0.138 0.046 0.000 0.000 0.184 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS A 4 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 4 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 11.98 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 133 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.092 NNE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.092 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.138 0.000 0.000 0.000 0.138 SE 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.092 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.092 S 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.092 SSW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.092 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.046 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.046 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.000 0.552 0.138 0.138 0.000 0.828 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS B 18 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 18 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 12.28 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 134 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.414 0.138 0.046 0.000 0.598 NNE 0.000 0.000 0.000 0.000 0.000 0.184 0.046 0.000 0.000 0.230 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.184 0.046 0.046 0.000 0.000 0.276 SE 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.092 SSE 0.000 0.000 0.000 0.046 0.046 0.000 0.046 0.000 0.000 0.138 S 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.046 0.000 0.138 SSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.138 0.138 0.046 0.000 0.322 WNW 0.000 0.000 0.000 0.000 0.000 0.138 0.138 0.092 0.000 0.368 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.092 0.276 0.000 0.368 NNW 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.000 0.000 0.092 SUBTOTAL 0.000 0.000 0.000 0.138 0.276 1.150 0.690 0.506 0.000 2.760 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS C 60 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 60 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 12.81 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 135 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.092 0.276 0.138 1.334 2.484 0.598 0.000 4.922 NNE 0.000 0.000 0.092 0.184 0.138 1.196 2.208 0.184 0.000 4.002 NE 0.000 0.000 0.092 0.276 0.414 1.104 0.460 0.000 0.000 2.346 ENE 0.000 0.000 0.138 0.184 0.184 0.322 0.000 0.000 0.000 0.828 E 0.000 0.000 0.046 0.184 0.276 0.230 0.046 0.000 0.000 0.782 ESE 0.000 0.000 0.276 0.184 0.506 0.506 0.460 0.230 0.000 2.162 SE 0.000 0.000 0.184 0.184 0.276 0.460 0.828 0.368 0.138 2.438 SSE 0.000 0.000 0.230 0.230 0.230 0.322 0.414 0.368 0.138 1.932 S 0.000 0.000 0.138 0.184 0.184 0.414 0.138 0.092 0.000 1.150 SSW 0.000 0.000 0.092 0.184 0.138 0.230 0.138 0.092 0.000 0.874 SW 0.000 0.000 0.184 0.230 0.184 0.414 0.184 0.000 0.000 1.196 WSW 0.000 0.000 0.138 0.092 0.138 0.644 0.828 0.138 0.000 1.978 W 0.000 0.000 0.092 0.184 0.230 1.380 1.794 0.322 0.000 4.002 WNW 0.000 0.000 0.000 0.138 0.322 1.104 1.012 0.598 0.276 3.450 NW 0.000 0.000 0.184 0.000 0.092 0.828 1.150 1.472 0.092 3.818 NNW 0.000 0.000 0.046 0.000 0.046 0.552 0.920 0.230 0.000 1.794 SUBTOTAL 0.000 0.000 2.024 2.714 3.496 11.040 13.063 4.692 0.644 37.672 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS D 819 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 819 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 12.32 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 136 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.046 0.046 0.092 0.092 0.782 0.644 0.230 0.000 1.932 NNE 0.000 0.000 0.046 0.184 0.230 0.920 0.460 0.138 0.000 1.978 NE 0.000 0.000 0.046 0.092 0.138 0.828 0.598 0.000 0.000 1.702 ENE 0.000 0.046 0.046 0.092 0.092 0.828 0.230 0.046 0.000 1.380 E 0.000 0.000 0.092 0.138 0.184 0.230 0.092 0.000 0.000 0.736 ESE 0.000 0.000 0.184 0.046 0.230 0.736 0.368 0.230 0.000 1.794 SE 0.000 0.000 0.046 0.276 0.368 2.254 2.162 0.874 0.368 6.348 SSE 0.000 0.000 0.000 0.598 0.230 1.472 1.794 0.782 0.322 5.198 S 0.000 0.000 0.000 0.230 0.414 2.116 2.438 1.886 0.598 7.682 SSW 0.000 0.000 0.184 0.276 0.276 1.472 2.070 1.058 0.230 5.566 SW 0.000 0.000 0.092 0.138 0.506 1.104 0.690 0.046 0.000 2.576 WSW 0.000 0.000 0.092 0.138 0.276 1.380 0.598 0.046 0.046 2.576 W 0.000 0.046 0.000 0.184 0.184 1.334 0.552 0.184 0.046 2.530 WNW 0.000 0.000 0.046 0.092 0.276 0.460 0.552 0.184 0.000 1.610 NW 0.000 0.000 0.000 0.184 0.138 0.230 0.230 0.276 0.046 1.104 NNW 0.000 0.000 0.046 0.138 0.092 0.644 0.506 0.046 0.000 1.472 SUBTOTAL 0.000 0.138 0.966 2.898 3.726 16.789 13.983 6.026 1.656 46.182 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS E 1004 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 1004 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 12.85 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 137 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.092 0.138 0.000 0.000 0.000 0.230 NNE 0.000 0.000 0.000 0.046 0.046 0.046 0.138 0.000 0.000 0.276 NE 0.000 0.000 0.000 0.000 0.138 0.276 0.000 0.000 0.000 0.414 ENE 0.000 0.000 0.000 0.000 0.092 0.092 0.092 0.000 0.000 0.276 E 0.000 0.000 0.092 0.000 0.092 0.092 0.000 0.000 0.000 0.276 ESE 0.000 0.000 0.092 0.046 0.184 0.322 0.046 0.000 0.000 0.690 SE 0.000 0.000 0.000 0.138 0.046 0.184 0.828 0.828 0.368 2.392 SSE 0.000 0.000 0.000 0.000 0.046 0.322 1.334 0.368 0.138 2.208 S 0.000 0.000 0.000 0.000 0.046 0.506 1.104 0.598 0.046 2.300 SSW 0.000 0.000 0.000 0.000 0.046 0.736 0.276 0.092 0.000 1.150 SW 0.000 0.000 0.092 0.046 0.046 0.000 0.046 0.000 0.000 0.230 WSW 0.000 0.000 0.000 0.046 0.046 0.046 0.000 0.000 0.000 0.138 W 0.000 0.000 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.138 WNW 0.000 0.000 0.092 0.000 0.000 0.046 0.046 0.000 0.000 0.184 NW 0.000 0.000 0.046 0.138 0.000 0.092 0.046 0.000 0.000 0.322 NNW 0.000 0.000 0.000 0.000 0.000 0.138 0.092 0.000 0.000 0.230 SUBTOTAL 0.000 0.000 0.414 0.460 0.920 3.128 4.094 1.886 0.552 11.454 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 13.83 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 138 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JAN 1, 2020 - MAR 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.046 0.000 0.000 0.138 0.000 0.000 0.000 0.184 ENE 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.000 0.000 0.138 0.000 0.000 0.000 0.138 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 0.000 0.092 S 0.000 0.000 0.000 0.000 0.000 0.000 0.138 0.092 0.000 0.230 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.046 SUBTOTAL 0.000 0.092 0.138 0.046 0.000 0.276 0.184 0.184 0.000 0.920 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS G 20 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 20 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/05/05 MEAN WIND SPEED = 11.14 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 139 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 8B 2nd Quarter JFD Elevated Releases Joint Frequency Distribution In Percent Page 140 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.047 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.047 0.047 0.000 0.000 0.094 SSE 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.047 S 0.000 0.000 0.000 0.000 0.094 0.047 0.047 0.000 0.000 0.188 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.141 0.094 0.141 0.000 0.000 0.376 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS A 8 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 8 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 9.82 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 141 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.141 0.423 0.000 0.000 0.564 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.094 0.047 0.000 0.000 0.141 SE 0.000 0.000 0.000 0.000 0.047 0.047 0.000 0.000 0.000 0.094 SSE 0.000 0.000 0.000 0.000 0.047 0.047 0.000 0.000 0.000 0.094 S 0.000 0.000 0.000 0.047 0.141 0.094 0.000 0.000 0.000 0.282 SSW 0.000 0.000 0.000 0.000 0.094 0.000 0.000 0.000 0.000 0.094 SW 0.000 0.000 0.000 0.094 0.000 0.000 0.000 0.000 0.000 0.094 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.047 0.047 0.047 0.141 NNW 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.047 0.000 0.094 SUBTOTAL 0.000 0.000 0.000 0.188 0.329 0.423 0.517 0.094 0.047 1.597 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS B 36 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 34 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 11.32 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 142 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.564 0.423 0.000 0.000 0.986 NNE 0.000 0.000 0.000 0.000 0.000 0.329 0.658 0.141 0.000 1.127 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.094 0.094 0.000 0.000 0.000 0.188 SE 0.000 0.000 0.000 0.047 0.000 0.376 0.094 0.000 0.000 0.517 SSE 0.000 0.000 0.000 0.000 0.000 0.047 0.047 0.000 0.000 0.094 S 0.000 0.000 0.000 0.047 0.094 0.235 0.000 0.000 0.000 0.376 SSW 0.000 0.000 0.000 0.094 0.000 0.047 0.047 0.047 0.000 0.235 SW 0.000 0.000 0.000 0.047 0.047 0.188 0.000 0.000 0.000 0.282 WSW 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.047 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.047 0.141 0.000 0.188 NW 0.000 0.000 0.000 0.000 0.000 0.094 0.047 0.188 0.094 0.423 NNW 0.000 0.000 0.000 0.000 0.000 0.141 0.047 0.047 0.000 0.235 SUBTOTAL 0.000 0.000 0.000 0.235 0.235 2.161 1.409 0.564 0.094 4.697 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS C 100 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 100 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 12.89 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 143 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.094 0.188 0.235 0.517 0.376 0.329 0.047 1.785 NNE 0.000 0.000 0.000 0.047 0.423 0.939 0.705 0.000 0.000 2.114 NE 0.000 0.000 0.094 0.047 0.188 0.470 0.047 0.000 0.000 0.845 ENE 0.000 0.000 0.047 0.047 0.047 0.282 0.047 0.000 0.000 0.470 E 0.000 0.000 0.188 0.282 0.141 0.141 0.000 0.000 0.000 0.752 ESE 0.000 0.000 0.141 0.282 0.423 0.986 0.658 0.141 0.188 2.818 SE 0.000 0.000 0.329 0.798 0.000 0.798 0.939 0.423 0.094 3.382 SSE 0.000 0.000 0.141 0.470 0.564 0.798 0.658 0.798 0.141 3.570 S 0.000 0.000 0.517 0.658 0.470 1.268 0.939 0.611 0.000 4.462 SSW 0.000 0.000 0.376 0.564 0.376 0.845 1.080 0.470 0.141 3.852 SW 0.000 0.000 0.282 0.705 0.658 1.409 0.517 0.141 0.000 3.711 WSW 0.000 0.000 0.470 0.752 0.517 1.597 0.705 0.094 0.094 4.227 W 0.000 0.000 0.047 0.517 0.845 1.033 0.892 0.423 0.141 3.899 WNW 0.000 0.000 0.047 0.188 0.752 1.409 0.939 1.080 0.047 4.462 NW 0.000 0.000 0.047 0.376 0.282 0.986 1.221 0.470 0.000 3.382 NNW 0.000 0.000 0.188 0.141 0.282 0.752 0.423 0.188 0.094 2.067 SUBTOTAL 0.000 0.000 3.006 6.059 6.200 14.232 10.146 5.167 0.986 45.796 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS D 995 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 975 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 11.05 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 144 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.047 0.094 0.141 0.658 0.611 0.188 0.000 1.738 NNE 0.000 0.000 0.047 0.141 0.235 0.329 0.986 0.282 0.000 2.020 NE 0.000 0.000 0.047 0.047 0.094 0.329 0.329 0.047 0.000 0.892 ENE 0.000 0.000 0.047 0.188 0.094 0.470 0.094 0.000 0.000 0.892 E 0.000 0.000 0.000 0.094 0.094 0.282 0.329 0.000 0.000 0.798 ESE 0.000 0.000 0.000 0.141 0.282 1.033 1.315 0.376 0.047 3.194 SE 0.000 0.000 0.141 0.094 0.423 2.302 1.456 0.705 0.188 5.308 SSE 0.000 0.000 0.141 0.376 0.423 1.691 1.033 0.329 0.235 4.227 S 0.000 0.000 0.000 0.235 0.611 0.798 0.892 0.423 0.047 3.006 SSW 0.000 0.047 0.188 0.141 0.329 0.611 1.033 0.047 0.000 2.395 SW 0.000 0.000 0.047 0.094 0.188 0.705 0.564 0.094 0.000 1.691 WSW 0.000 0.000 0.188 0.141 0.094 0.845 0.235 0.047 0.000 1.550 W 0.000 0.000 0.000 0.282 0.329 0.798 0.094 0.047 0.000 1.550 WNW 0.000 0.000 0.000 0.141 0.188 0.470 0.000 0.000 0.000 0.798 NW 0.000 0.000 0.000 0.000 0.047 0.329 0.376 0.000 0.000 0.752 NNW 0.000 0.000 0.000 0.047 0.141 0.376 0.986 0.188 0.047 1.785 SUBTOTAL 0.000 0.047 0.892 2.255 3.711 12.024 10.333 2.771 0.564 32.597 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS E 722 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 694 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 11.80 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 145 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.047 0.000 0.000 0.658 0.188 0.000 0.892 NNE 0.000 0.000 0.000 0.000 0.047 0.047 0.564 0.094 0.000 0.752 NE 0.000 0.047 0.000 0.188 0.047 0.141 0.329 0.000 0.000 0.752 ENE 0.000 0.000 0.094 0.047 0.141 0.517 0.235 0.000 0.000 1.033 E 0.000 0.000 0.047 0.235 0.141 0.094 0.235 0.000 0.000 0.752 ESE 0.000 0.000 0.000 0.188 0.188 0.235 0.047 0.000 0.000 0.658 SE 0.000 0.000 0.000 0.094 0.188 0.752 0.141 0.000 0.000 1.174 SSE 0.000 0.000 0.000 0.094 0.470 0.376 0.235 0.282 0.000 1.456 S 0.000 0.000 0.047 0.094 0.141 0.282 0.376 0.094 0.000 1.033 SSW 0.000 0.000 0.047 0.047 0.047 0.329 0.376 0.000 0.000 0.845 SW 0.000 0.000 0.000 0.047 0.000 0.094 0.094 0.000 0.000 0.235 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.047 W 0.000 0.000 0.047 0.047 0.047 0.047 0.047 0.000 0.000 0.235 WNW 0.000 0.000 0.047 0.094 0.094 0.282 0.000 0.047 0.000 0.564 NW 0.000 0.000 0.047 0.094 0.094 0.188 0.000 0.000 0.000 0.423 NNW 0.000 0.000 0.000 0.047 0.047 0.235 0.282 0.047 0.000 0.658 SUBTOTAL 0.000 0.047 0.376 1.362 1.691 3.617 3.664 0.752 0.000 11.508 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 245 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 10.92 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 146 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT APR 1, 2020 - JUN 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.047 NNE 0.000 0.000 0.000 0.047 0.047 0.000 0.047 0.094 0.000 0.235 NE 0.000 0.000 0.047 0.047 0.047 0.094 0.094 0.188 0.000 0.517 ENE 0.000 0.000 0.000 0.094 0.094 0.235 0.235 0.000 0.000 0.658 E 0.000 0.000 0.000 0.094 0.047 0.000 0.000 0.000 0.000 0.141 ESE 0.000 0.000 0.000 0.141 0.141 0.000 0.000 0.000 0.000 0.282 SE 0.000 0.000 0.094 0.047 0.000 0.094 0.047 0.000 0.000 0.282 SSE 0.000 0.000 0.000 0.047 0.000 0.094 0.094 0.000 0.000 0.235 S 0.000 0.000 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.047 SSW 0.000 0.047 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.094 SW 0.000 0.047 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.141 WSW 0.000 0.000 0.094 0.000 0.000 0.000 0.000 0.000 0.000 0.094 W 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.000 0.047 WNW 0.000 0.000 0.000 0.047 0.000 0.000 0.000 0.000 0.000 0.047 NW 0.000 0.000 0.000 0.047 0.094 0.188 0.000 0.000 0.000 0.329 NNW 0.000 0.000 0.000 0.094 0.094 0.047 0.000 0.000 0.000 0.235 SUBTOTAL 0.000 0.141 0.423 0.705 0.564 0.798 0.517 0.282 0.000 3.429 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2183 TOTAL HOURS OF STABILITY CLASS G 73 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 73 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2129 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/08/10 MEAN WIND SPEED = 8.58 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 147 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 8C 3rd Quarter JFD Elevated Releases Joint Frequency Distribution In Percent Page 148 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.091 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.228 0.594 0.228 0.000 0.000 1.050 SSE 0.000 0.000 0.000 0.091 0.137 0.137 0.137 0.000 0.000 0.502 S 0.000 0.000 0.000 0.000 0.000 0.046 0.046 0.000 0.046 0.137 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.046 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.046 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.046 SUBTOTAL 0.000 0.000 0.000 0.091 0.365 0.776 0.639 0.000 0.046 1.918 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS A 42 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 42 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 10.83 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 149 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.137 0.046 0.000 0.000 0.183 NNE 0.000 0.000 0.000 0.000 0.000 0.137 0.046 0.000 0.000 0.183 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.091 SE 0.000 0.000 0.000 0.091 0.228 0.228 0.046 0.046 0.000 0.639 SSE 0.000 0.000 0.046 0.137 0.137 0.183 0.046 0.000 0.000 0.548 S 0.000 0.000 0.000 0.046 0.046 0.046 0.000 0.091 0.000 0.228 SSW 0.000 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.091 SW 0.000 0.000 0.000 0.000 0.000 0.091 0.137 0.000 0.000 0.228 WSW 0.000 0.000 0.000 0.000 0.000 0.091 0.137 0.000 0.000 0.228 W 0.000 0.000 0.000 0.000 0.000 0.320 0.000 0.000 0.000 0.320 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.137 0.000 0.000 0.137 NW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.000 0.000 0.091 0.091 0.000 0.000 0.183 SUBTOTAL 0.000 0.000 0.046 0.320 0.411 1.461 0.685 0.183 0.000 3.105 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS B 68 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 68 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 10.65 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 150 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.091 0.046 0.046 0.000 0.183 NNE 0.000 0.000 0.000 0.000 0.000 0.091 0.046 0.046 0.000 0.183 NE 0.000 0.000 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.091 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.046 0.091 0.046 0.000 0.000 0.183 SE 0.000 0.000 0.000 0.228 0.137 0.411 0.046 0.091 0.000 0.913 SSE 0.000 0.000 0.046 0.274 0.274 0.228 0.046 0.046 0.000 0.913 S 0.000 0.000 0.000 0.274 0.091 0.046 0.046 0.000 0.000 0.457 SSW 0.000 0.000 0.046 0.046 0.000 0.091 0.000 0.046 0.000 0.228 SW 0.000 0.000 0.000 0.228 0.046 0.183 0.091 0.000 0.000 0.548 WSW 0.000 0.000 0.000 0.137 0.000 0.046 0.000 0.000 0.000 0.183 W 0.000 0.000 0.000 0.137 0.137 0.548 0.046 0.000 0.000 0.868 WNW 0.000 0.000 0.000 0.000 0.091 0.320 0.000 0.000 0.000 0.411 NW 0.000 0.000 0.000 0.000 0.046 0.046 0.046 0.046 0.000 0.183 NNW 0.000 0.000 0.000 0.000 0.046 0.274 0.137 0.000 0.000 0.457 SUBTOTAL 0.000 0.000 0.091 1.324 0.913 2.557 0.594 0.320 0.000 5.799 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS C 127 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 127 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 9.01 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 151 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.228 0.228 0.091 0.548 0.457 0.183 0.046 1.781 NNE 0.000 0.000 0.137 0.183 0.320 0.502 0.639 0.046 0.000 1.826 NE 0.000 0.000 0.091 0.091 0.183 0.685 0.091 0.046 0.000 1.187 ENE 0.000 0.000 0.183 0.046 0.046 0.502 0.000 0.000 0.000 0.776 E 0.000 0.000 0.228 0.183 0.274 0.320 0.137 0.000 0.000 1.142 ESE 0.000 0.000 0.228 0.411 0.594 1.050 0.548 0.000 0.000 2.831 SE 0.000 0.046 0.548 1.187 0.639 0.776 0.320 0.091 0.000 3.607 SSE 0.000 0.000 0.822 0.731 0.274 0.913 0.183 0.274 0.000 3.196 S 0.000 0.000 0.822 0.776 0.548 1.279 0.685 0.548 0.137 4.795 SSW 0.000 0.000 0.913 0.776 0.411 0.502 0.868 0.274 0.000 3.744 SW 0.000 0.000 0.959 1.005 0.548 0.868 0.548 0.000 0.000 3.927 WSW 0.000 0.000 0.411 1.598 0.959 0.594 0.502 0.000 0.000 4.064 W 0.000 0.000 0.183 1.142 0.913 1.279 0.228 0.000 0.000 3.744 WNW 0.000 0.000 0.091 0.228 0.457 0.868 0.502 0.091 0.000 2.237 NW 0.000 0.000 0.046 0.137 0.274 0.274 0.274 0.046 0.046 1.096 NNW 0.000 0.000 0.000 0.228 0.320 0.594 0.457 0.000 0.000 1.598 SUBTOTAL 0.000 0.046 5.890 8.950 6.849 11.553 6.438 1.598 0.228 41.553 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS D 910 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 910 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 8.31 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 152 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.046 0.183 0.913 1.324 0.091 0.000 2.603 NNE 0.000 0.000 0.046 0.046 0.183 1.324 1.781 0.137 0.000 3.516 NE 0.000 0.000 0.137 0.137 0.411 0.685 0.868 0.091 0.046 2.374 ENE 0.000 0.000 0.137 0.091 0.137 0.776 0.320 0.046 0.000 1.507 E 0.000 0.000 0.091 0.183 0.091 0.594 0.959 0.091 0.000 2.009 ESE 0.000 0.000 0.091 0.274 0.502 1.324 1.416 0.320 0.000 3.927 SE 0.000 0.000 0.091 0.228 0.731 1.644 1.050 0.091 0.000 3.836 SSE 0.000 0.000 0.274 0.228 0.959 1.233 0.091 0.046 0.000 2.831 S 0.000 0.000 0.137 0.685 0.868 0.868 0.548 0.000 0.000 3.105 SSW 0.000 0.000 0.091 0.320 0.091 0.411 0.365 0.137 0.000 1.416 SW 0.000 0.000 0.183 0.457 0.320 0.548 0.228 0.000 0.000 1.735 WSW 0.000 0.000 0.000 0.228 0.457 0.183 0.046 0.046 0.000 0.959 W 0.000 0.000 0.137 0.274 0.594 0.274 0.137 0.000 0.000 1.416 WNW 0.000 0.000 0.091 0.228 0.183 0.365 0.046 0.000 0.000 0.913 NW 0.000 0.000 0.183 0.137 0.228 0.137 0.091 0.000 0.000 0.776 NNW 0.000 0.000 0.091 0.183 0.228 0.502 0.274 0.091 0.000 1.370 SUBTOTAL 0.000 0.000 1.826 3.744 6.164 11.781 9.543 1.187 0.046 34.292 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS E 751 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 751 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 10.12 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 153 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.091 0.046 0.548 0.411 0.000 0.000 1.142 NNE 0.000 0.046 0.137 0.137 0.091 0.457 0.183 0.046 0.000 1.096 NE 0.000 0.000 0.091 0.137 0.091 0.685 0.274 0.046 0.000 1.324 ENE 0.000 0.046 0.046 0.046 0.046 0.457 0.183 0.046 0.000 0.868 E 0.000 0.000 0.000 0.091 0.228 0.685 0.137 0.000 0.000 1.142 ESE 0.000 0.000 0.183 0.137 0.183 0.320 0.320 0.000 0.000 1.142 SE 0.000 0.000 0.137 0.091 0.274 0.457 0.365 0.000 0.000 1.324 SSE 0.000 0.000 0.183 0.137 0.137 0.411 0.000 0.000 0.000 0.868 S 0.000 0.000 0.183 0.091 0.274 0.137 0.000 0.000 0.000 0.685 SSW 0.000 0.046 0.228 0.091 0.000 0.000 0.091 0.000 0.000 0.457 SW 0.000 0.000 0.046 0.091 0.000 0.000 0.000 0.000 0.000 0.137 WSW 0.000 0.046 0.046 0.091 0.000 0.000 0.000 0.000 0.000 0.183 W 0.000 0.000 0.046 0.137 0.000 0.000 0.046 0.000 0.000 0.228 WNW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NW 0.000 0.000 0.000 0.228 0.091 0.000 0.000 0.000 0.000 0.320 NNW 0.000 0.000 0.091 0.046 0.091 0.046 0.137 0.000 0.000 0.411 SUBTOTAL 0.000 0.183 1.461 1.644 1.553 4.247 2.146 0.137 0.000 11.370 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 249 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 8.69 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 154 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT JUL 1, 2020 - SEP 30, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.000 0.000 0.046 0.046 0.000 0.000 0.137 NNE 0.000 0.000 0.000 0.046 0.000 0.137 0.411 0.000 0.000 0.594 NE 0.000 0.000 0.046 0.000 0.000 0.046 0.183 0.000 0.000 0.274 ENE 0.000 0.000 0.000 0.000 0.046 0.091 0.046 0.000 0.000 0.183 E 0.000 0.000 0.000 0.000 0.091 0.091 0.000 0.000 0.000 0.183 ESE 0.000 0.046 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.137 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.228 0.000 0.000 0.000 0.228 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.091 WSW 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 SUBTOTAL 0.000 0.046 0.137 0.228 0.183 0.685 0.685 0.000 0.000 1.963 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2190 TOTAL HOURS OF STABILITY CLASS G 43 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 43 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2190 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2020/10/13 MEAN WIND SPEED = 9.80 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 155 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data Table 8D 4th Quarter JFD Elevated Releases Joint Frequency Distribution In Percent Page 156 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.136 0.000 0.000 0.136 SSE 0.000 0.000 0.000 0.000 0.045 0.091 0.091 0.045 0.000 0.273 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.045 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.000 0.045 0.136 0.227 0.045 0.000 0.455 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS A 10 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 10 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 13.16 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 157 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.000 0.091 SE 0.000 0.000 0.000 0.045 0.000 0.000 0.045 0.000 0.000 0.091 SSE 0.000 0.000 0.000 0.091 0.136 0.045 0.091 0.000 0.000 0.364 S 0.000 0.000 0.000 0.000 0.000 0.045 0.045 0.000 0.000 0.091 SSW 0.000 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.045 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.000 0.000 0.136 0.182 0.182 0.182 0.000 0.000 0.682 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS B 15 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 15 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 9.74 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 158 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.091 0.227 0.000 0.000 0.318 NNE 0.000 0.000 0.000 0.000 0.000 0.045 0.136 0.000 0.000 0.182 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.045 0.091 0.364 0.000 0.000 0.000 0.500 SE 0.000 0.000 0.000 0.000 0.000 0.182 0.000 0.091 0.000 0.273 SSE 0.000 0.000 0.000 0.045 0.091 0.000 0.091 0.091 0.000 0.318 S 0.000 0.000 0.000 0.000 0.045 0.000 0.091 0.000 0.000 0.136 SSW 0.000 0.000 0.000 0.091 0.000 0.000 0.000 0.000 0.000 0.091 SW 0.000 0.000 0.000 0.000 0.000 0.136 0.000 0.000 0.000 0.136 WSW 0.000 0.000 0.000 0.000 0.000 0.045 0.000 0.000 0.000 0.045 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.136 0.000 0.136 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.045 0.045 0.045 0.000 0.136 SUBTOTAL 0.000 0.000 0.000 0.182 0.227 0.909 0.591 0.364 0.000 2.273 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS C 50 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 50 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 11.90 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 159 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.136 0.273 0.136 2.000 1.091 0.273 0.000 3.909 NNE 0.000 0.000 0.045 0.182 0.227 2.045 0.591 0.182 0.136 3.409 NE 0.000 0.000 0.045 0.091 0.182 0.455 0.091 0.000 0.000 0.864 ENE 0.000 0.000 0.091 0.182 0.364 0.318 0.000 0.000 0.000 0.955 E 0.000 0.000 0.045 0.136 0.136 0.091 0.091 0.136 0.045 0.682 ESE 0.000 0.000 0.136 0.636 0.500 1.273 0.955 0.091 0.000 3.591 SE 0.000 0.000 0.318 0.591 0.500 0.455 0.455 0.364 0.091 2.773 SSE 0.000 0.000 0.364 0.318 0.273 0.636 0.455 0.273 0.045 2.364 S 0.000 0.000 0.136 0.500 0.091 0.318 0.136 0.091 0.091 1.364 SSW 0.000 0.045 0.318 0.136 0.045 0.273 0.045 0.000 0.045 0.909 SW 0.000 0.045 0.273 0.500 0.045 0.273 0.045 0.000 0.000 1.182 WSW 0.000 0.000 0.318 0.364 0.500 0.591 0.455 0.182 0.136 2.545 W 0.000 0.091 0.000 0.318 0.727 1.318 0.773 0.500 0.000 3.727 WNW 0.000 0.000 0.136 0.500 0.364 0.818 0.864 1.136 0.318 4.136 NW 0.000 0.000 0.091 0.318 0.636 0.500 1.136 1.136 0.136 3.955 NNW 0.000 0.000 0.045 0.136 0.136 0.636 1.591 0.591 0.045 3.182 SUBTOTAL 0.000 0.182 2.500 5.182 4.864 12.000 8.773 4.955 1.091 39.545 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS D 870 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 870 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 11.25 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 160 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.091 0.045 0.091 0.636 0.955 0.091 0.000 1.909 NNE 0.000 0.000 0.045 0.000 0.136 0.909 0.273 0.000 0.000 1.364 NE 0.000 0.000 0.045 0.045 0.136 0.864 0.364 0.091 0.000 1.545 ENE 0.000 0.000 0.000 0.136 0.182 0.182 0.091 0.091 0.000 0.682 E 0.000 0.000 0.136 0.091 0.318 0.409 0.273 0.364 0.000 1.591 ESE 0.000 0.000 0.000 0.182 0.273 1.545 2.273 0.364 0.000 4.636 SE 0.000 0.000 0.091 0.273 0.091 1.455 3.364 0.818 0.227 6.318 SSE 0.000 0.000 0.000 0.091 0.273 1.136 1.136 1.409 0.727 4.773 S 0.000 0.000 0.045 0.182 0.091 0.955 0.364 0.818 0.182 2.636 SSW 0.000 0.000 0.045 0.182 0.091 0.500 0.364 0.091 0.045 1.318 SW 0.000 0.000 0.045 0.136 0.091 0.591 0.091 0.000 0.000 0.955 WSW 0.000 0.000 0.000 0.182 0.091 0.409 0.136 0.000 0.000 0.818 W 0.000 0.000 0.045 0.136 0.136 0.545 0.364 0.045 0.000 1.273 WNW 0.000 0.000 0.091 0.091 0.273 0.455 0.318 0.000 0.000 1.227 NW 0.000 0.000 0.091 0.227 0.318 0.182 0.727 0.091 0.000 1.636 NNW 0.000 0.000 0.136 0.000 0.045 0.227 0.455 0.045 0.000 0.909 SUBTOTAL 0.000 0.000 0.909 2.000 2.636 11.000 11.545 4.318 1.182 33.591 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS E 739 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 739 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 13.10 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 161 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.182 0.682 0.182 0.000 1.045 NNE 0.000 0.000 0.000 0.045 0.045 0.318 0.364 0.136 0.000 0.909 NE 0.000 0.000 0.000 0.000 0.000 0.364 0.136 0.000 0.000 0.500 ENE 0.000 0.000 0.000 0.000 0.045 0.182 0.409 0.045 0.000 0.682 E 0.000 0.000 0.000 0.091 0.045 0.318 0.227 0.000 0.000 0.682 ESE 0.000 0.000 0.091 0.227 0.182 0.909 0.227 0.000 0.000 1.636 SE 0.000 0.000 0.091 0.091 0.273 0.818 0.727 0.000 0.000 2.000 SSE 0.000 0.000 0.045 0.091 0.318 1.091 0.727 0.455 0.000 2.727 S 0.000 0.000 0.000 0.045 0.364 0.682 0.591 0.273 0.000 1.955 SSW 0.000 0.000 0.000 0.000 0.091 0.136 0.136 0.000 0.000 0.364 SW 0.000 0.000 0.045 0.000 0.000 0.045 0.000 0.000 0.000 0.091 WSW 0.000 0.000 0.000 0.273 0.000 0.136 0.000 0.000 0.000 0.409 W 0.000 0.000 0.045 0.227 0.045 0.182 0.136 0.000 0.000 0.636 WNW 0.000 0.045 0.182 0.182 0.136 0.091 0.000 0.000 0.000 0.636 NW 0.000 0.045 0.045 0.136 0.000 0.273 0.000 0.000 0.000 0.500 NNW 0.000 0.000 0.000 0.091 0.000 0.182 0.273 0.000 0.000 0.545 SUBTOTAL 0.000 0.091 0.545 1.500 1.545 5.909 4.636 1.091 0.000 15.318 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS F 337 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 337 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 11.11 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 162 of 163

Browns Ferry Nuclear Plant Units 1, 2 and 3 2020 Annual Radioactive Effluent Release Report Meteorological Data JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)

BROWNS FERRY NUCLEAR PLANT OCT 1, 2020 - DEC 31, 2020 WIND WIND SPEED(MPH)

DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.091 0.000 0.000 0.182 0.000 0.000 0.273 NNE 0.000 0.000 0.045 0.045 0.045 0.000 0.364 0.045 0.000 0.545 NE 0.000 0.000 0.045 0.045 0.000 0.045 0.136 0.000 0.000 0.273 ENE 0.000 0.000 0.045 0.045 0.045 0.273 0.409 0.000 0.000 0.818 E 0.000 0.000 0.000 0.091 0.091 0.227 0.136 0.000 0.000 0.545 ESE 0.000 0.000 0.136 0.136 0.182 0.409 0.000 0.000 0.000 0.864 SE 0.000 0.000 0.000 0.227 0.273 0.273 0.000 0.000 0.000 0.773 SSE 0.000 0.000 0.045 0.091 0.136 0.364 0.136 0.000 0.000 0.773 S 0.000 0.000 0.136 0.136 0.091 0.182 0.182 0.045 0.000 0.773 SSW 0.000 0.000 0.045 0.136 0.136 0.136 0.045 0.000 0.000 0.500 SW 0.000 0.000 0.045 0.182 0.045 0.182 0.000 0.000 0.000 0.455 WSW 0.000 0.000 0.000 0.182 0.091 0.045 0.000 0.000 0.000 0.318 W 0.000 0.045 0.000 0.045 0.091 0.000 0.000 0.000 0.000 0.182 WNW 0.000 0.000 0.045 0.000 0.000 0.000 0.000 0.000 0.000 0.045 NW 0.000 0.000 0.091 0.182 0.091 0.000 0.000 0.000 0.000 0.364 NNW 0.000 0.045 0.227 0.045 0.091 0.000 0.182 0.045 0.000 0.636 SUBTOTAL 0.000 0.091 0.909 1.682 1.409 2.136 1.773 0.136 0.000 8.136 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2200 TOTAL HOURS OF STABILITY CLASS G 179 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 179 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2200 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: BROWNS FERRY NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 10.03 AND 89.59 METERS WIND SPEED AND DIRECTION MEASURED AT 90.29 METER LEVEL DATE PRINTED: 2021/01/04 MEAN WIND SPEED = 8.60 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS Page 163 of 163

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