RBG-48276, 2023 Annual Radioactive Effluent Release Report

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2023 Annual Radioactive Effluent Release Report
ML24114A071
Person / Time
Site: River Bend Entergy icon.png
Issue date: 04/23/2024
From: Crawford R
Entergy Operations
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
RBG-48276
Download: ML24114A071 (1)
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Text

{{#Wiki_filter:~ entergy Randy Crawford Manager Regulatory Assurance 225-381-4177

RBG-48276

April 23, 2024

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

2023 Annual Radioactive Effluent Release Report River Bend Station - Unit 1 Renewed Operating License No. NPF-47 Docket No. 50-458

Enclosed is the River Bend Station (RBS) Annual Radioactive Effluent Release Report for the period of January 1, 2023, through December 31, 2023. This report is submitted in accordance with the RBS Technical Specifications, Section 5.6.3.

Should you have any questions regarding the enclosed, please contact Randy Crawford, at (225) 381-4177.

Sincerely,

Randy Crawford

RTC/twf

Enclosure:

2023 Annual Radioactive Effluent Release Report

cc: NRC Senior Resident Inspector - River Bend Station, Unit 1 Enclosure 2023 Annual Radioactive Effluent Release Report entergy

Plant: River Bend Nuclear Station Page 1 of 70 YEAR: 2023 Document Number: RBG-48276 Annual Radioactive Effluent Release Report

Review and Approval:

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TABLE OF CONTENTS

1.0 INTRODUCTION

..................................................................................................................                     ...... 3

2.0 SUPPLEMENTAL INFORMATION .............................................................................................. 3

3.0 GASEOUS EFFLUENTS........................................................................................................... 13

4.0 LIQUID EFFLUENTS .............................................................................................................. .. 17

5.0 SOLID WASTE

SUMMARY

......................................................................................................          22

6.0 RADIOLOGICAL IMPACT TO MAN .......................................................................................... 24

7.0 METEORLOGICAL DATA ......................................................................................................... 27

ATTACHMENTS 

 - Groundwater Monitoring Well Sampling Results                                                 ........................................................... 44 Plant: River Bend Nuclear Station                                          Year: 2023                     Page 3 of 70 Annual Radioactive Effluent Release Report

1.0 INTRODUCTION

This is the Annual Radioactive Effluent Release Report for the period of January 1, 2023, through December 31, 2023. This report is submitted in accordance with Technical Specification 5.6.3 of Appendix A to River Bend Station (RBS) License Number NPF-47.

2.0 SUPPLEMENTAL INFORMATION

2.1 Regulatory Limits

2.1.1 10CFR50, Appendix I Limits

1. Fission and activation gases:
a. In accordance with Technical Requirement (TR) 3.11.2.2, the air dose due to noble gases released in gaseous effluent to areas at and beyond the SITE BOUNDARY shall be limited to:
1) Quarterly

x Less than or equal to 5 mrads gamma x Less than or equal to 10 mrads beta

2) Yearly

x Less than or equal to 10 mrads gamma x Less than or equal to 20 mrads beta

2. Iodine, tritium, and all radionuclides in particulate form with half-lives greater than 8 days.
a. In accordance with Technical Requirement 3.11.2.3, the dose to a MEMBER OF THE PUBLIC from radioiodines (I-131 and I-133), tritium (H-3) and all radionuclides in particulate form with half-lives greater than 8 days, in gaseous effluent releases to areas at and beyond the SITE BOUNDARY shall be limited to:
1) Quarterly

x Less than or equal to 7.5 mrem to any organ

2) Yearly

x Less than or equal to 15 mrem to any organ Plant: River Bend Nuclear Station Year: 2023 Page 4 of 70 Annual Radioactive Effluent Release Report

3. Liquid Effluents Dose
a. In accordance with Technical Requirement 3.11.1.2, the dose or dose commitment to a MEMBER OF THE PUBLIC from radioactive materials in liquid effluent released to UNRESTRICTED AREAS shall be limited to:
1) Quarterly

x Less than or equal to 1.5 mrem total body x Less than or equal to 5 mrem critical organ

2) Yearly

x Less than or equal to 3 mrem total body x Less than or equal to 10 mrem critical organ

4. Total Dose (40CFR190)
a. In accordance with Technical Requirement 3.11.4, the annual (calendar year) dose or dose commitment to any MEMBER OF THE PUBLIC, due to releases of radioactivity and to radiation from uranium fuel cycle sources, shall be limited to:

x Less than or equal to 25 mrem, Total Body or any Organ except Thyroid. x Less than or equal to 75 mrem, Thyroid

2.1.2 Miscellaneous Limits

1. Technical Requirement 3.11.2.1 - Fission and Activation Gases
a. In accordance with Technical Requirement 3.11.2.1, the dose rate due to radioactive materials released in gaseous effluents from the site to areas at and beyond the SITE BOUNDARY shall be:

x Less than or equal to 500 mrem/year to the total body x Less than or equal to 3000 mrem/year to the skin

2. Technical Requirement 3.11.2.1 - Radioiodine (I-131 & I-133) and Particulate
a. In accordance with Technical Requirement 3.11.2.1, the dose rate due to radioiodines, tritium, and all radionuclides in particulate form with half-lives greater than 8 days released in gaseous effluents from the site to areas at and beyond the SITE BOUNDARY shall be limited to:

x Less than or equal to 1500 mrem/yr to any organ Plant: River Bend Nuclear Station Year: 2023 Page 5 of 70 Annual Radioactive Effluent Release Report

3. Technical Requirement 3.11.1.1 - Liquid Effluent
a. In accordance with Technical Requirement 3.11.1.1, the concentration of radioactive material released in liquid effluent to UNRESTRICTED AREAS shall be limited to ten times the concentrations specified in 10CFR20, 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 2.0E-04 microcuries/milliliter total concentration.
4. Technical Requirement 3.11.2.5 - Ventilation Exhaust Treatment
a. In accordance with Technical Requirement 3.11.2.5, the VENTILATION EXHAUST TREATMENT SYSTEM shall be used to reduce radioactive materials in gaseous waste prior to their discharge when the projected doses, due to gaseous effluent releases to areas and beyond the SITE BOUNDARY would exceed 0.3 mrem to any organ in a 31-day period.
5. Technical Requirement 3.11.1.3 - Liquid Radwaste Treatment System
a. In accordance with Technical Requirement 3.11.1.3, the liquid radwaste treatment system shall be used to reduce the radioactive materials in liquid waste prior to their discharge when the projected doses, due to the liquid effluent, to UNRESTRICTED AREAS would exceed 0.06 mrem to the total body or 0.2 mrem to any organ in a 31-day period.

2.2 Effluent Concentration Limits

1. Gaseous Releases
a. The concentrations of radioactive gaseous releases are based on the dose rate restrictions in RBS Technical Requirements, rather than the Effluent Concentration Limits (ECL) listed in 10CFR20 Appendix B, Table 2, Column 1.
2. Liquid Releases
a. The Effluent Concentration Limits of radioactive materials in liquid effluents are limited to ten times 10CFR20, Appendix B, Table 2, Column 2.

2.3 Measurements & Approximations of Total Radioactivity

1. Gaseous Effluent
a. Fission & activation gases

Periodic grab samples are obtained from the Main Plant Exhaust Duct, Fuel Building Exhaust Vent and Radwaste Building Exhaust Vent. These samples are analyzed using high purity germanium detectors coupled to computerized pulse height analyzers. The sampling and analysis frequencies are described in Table 5.

Plant: River Bend Nuclear Station Year: 2023 Page 6 of 70 Annual Radioactive Effluent Release Report

Sampling and analysis of these effluent streams provide noble gas radionuclide relative abundance that can then be applied to the noble gas gross activity and gross activity release rate to obtain nuclide specific activities and release rates. The noble gas gross activity released within a specific time period is determined by integrating the stack monitor release rate over the considered time period. If no activity was detected between the stack grab sample and a significant increase in hourly averages was recorded, the nuclide relative abundance of the last sample (or the last similar event), which indicated the presence of activity, was used to obtain nuclide specific activities. Correction factors for the monitors are derived and applied for each sampling period whenever noble gas radionuclides are detected in the effluent stream.

b. Particulate and Radioiodine (I-131 & I-133)

Particulates, Iodine-131 and Iodine-133 are continuously sampled from the three release points using a particulate filter and charcoal cartridge in line with a sample pump (stack monitor pump). These filters and charcoal cartridges are removed and analyzed in accordance with the frequencies specified in Table 5. Analysis is performed to identify and quantify radionuclides using high purity germanium detectors coupled to computerized pulse height analyzers. Given the nuclide specific activity concentrations, process flow rate, and duration of the sample, the nuclide specific activity released to the environment can be obtained. Due to the continuous sampling process, it is assumed that the radioactive material is released to the environment at a constant rate within the sampling period. Strontium-89, Strontium-90, and Gross alpha are quantitatively analyzed by counting by gas flow proportional counting.

c. Tritium

Tritium grab samples are obtained from the three gaseous release points at the specified frequencies listed in Table 5 using an ice bath condensation collection method. The collected sample is then analyzed using a liquid scintillation counter. Given the tritium concentration, process flow rate, and time period for which the sample is obtained, the tritium activity released to the environment can be determined. Due to the frequency of sampling, it is assumed that the tritium is released to the environment at a constant rate within the time period for which the sample is obtained.

Plant: River Bend Nuclear Station Year: 2023 Page 7 of 70 Annual Radioactive Effluent Release Report

d. Carbon-14

The bounding annual dose from C-14 was calculated using guidance from Regulatory Guide 1.21, Revision 2, NUREG-0016, and the methodology in Regulatory Guide 1.109. The results of this calculation are listed in Table 14. The C-14 source term of 11 curies was taken from the site calculation PR(C)-359-3A, Gaseous Releases per NUREG-0016 Revision

1. Carbon-14 does not have dose factors associated with standing on contaminated ground; therefore, no ground plane dose was calculated.

There is no milk pathway within five miles of River Bend Station, so this pathway is not evaluated. RBS does not take credit for decay in the X/Q. This calculation assumes the inhalation, meat and vegetation pathways are at the site boundary in the sector with the highest X/Q. The dose from liquid effluents is not calculated as the dose contribution from C-14 is considered to be insignificant as indicated in Regulatory Guide 1.21, Revision 2. According to EPRI 1021106, Estimation of Carbon-14 in Nuclear Power Plant Gaseous Effluents, 95% of the carbon released is in the form of carbon dioxide and this contributes the highest dose to man. The ingestion pathway, specifically vegetation, is the most likely route of intake for man. An assumption has been made for gaseous releases that plants obtain all of their C-14 from carbon dioxide.

e. Nickel-63

No Nickel-63 was quantified in 2023.

f. Gaseous Effluent Summary Information

Gaseous effluent summary information is located in Table 2, Table 3, and Table 4. It should be noted that an entry of 0.00E+00 Curie (Ci) or microcurie/second (uCi/sec) in this section indicates that the concentration of the particular radionuclide was below the Lower Limit of Detection (LLD) as listed in Table 5. Also, any nuclide not appearing in the tables was < LLD for all four quarters.

2. Liquid Effluents
a. Representative grab samples are obtained from the appropriate sample recovery tank and analyzed prior to release of the tank in accordance with the frequencies listed in Table 9. Analysis for gamma emitting nuclides (including dissolved and entrained noble gases) is performed using a high purity germanium detector coupled to a computerized pulse height analyzer. Tritium concentration is determined using a liquid scintillation counter. Strontium-89, Strontium-90, and Gross alpha analysis are performed using a gas flow proportional counter. Iron-55 is counted with a liquid scintillation counter after digestion of the iron. The activity of each nuclide released to the environment is determined from the nuclide specific concentration and total tank volume released.
b. Liquid effluent summation information is located in Table 6 and Table 7.

It should be noted that an entry of 0.00E+00 Ci or uCi/ml in this section indicates that the concentration of the particular radionuclide was below the Lower Limit of Detection (LLD) as listed in Table 9. Also, any nuclide not appearing in the tables was < LLD for all four quarters. Plant: River Bend Nuclear Station Year: 2023 Page 8 of 70 Annual Radioactive Effluent Release Report

3. Estimate of Total Error
a. Liquid

The maximum error associated with sample collection, laboratory analysis, and discharge volume is collectively estimated to be:

Fission and Activation Products + 14.2%

Tritium + 14.2%

Dissolved and Entrained Noble Gases + 14.2%

Gross Alpha Radioactivity + 14.2%

b. Gaseous

The maximum error (not including sample line loss) associated with sample flow, process flow, sample collection, monitor accuracy and laboratory analysis are collectively estimated to be:

Noble Gases + 37.0%

Iodines + 18.6%

Particulate + 18.6%

Tritium + 18.2%

c. Determination of Total Error

The total error (i.e., collective error due to sample collection, laboratory analysis, sample flow, process flow, monitor accuracy, etc.) is calculated using the following equation: 

                                        =                 [(    )              +          (     )    +.       .       .       (         )    ]

Where:

ET = total error

E1 ... E n = individual errors due to sample collection, laboratory analysis, sample flow, process flow, monitor accuracy, etc. Plant: River Bend Nuclear Station Year: 2023 Page 9 of 70 Annual Radioactive Effluent Release Report

2.4 Batch Releases:

2.4.1 Liquid

Batch releases and receiving stream flow from River Bend Station during the reporting period of January 1, 2023 , through December 31, 2023 are shown in Table 8.

The Mississippi River stream flow is obtained by averaging data from the U. S. Army Corp of Engineers website using flow gauge data at Tarbert Landing.

2.4.2 Gaseous

There were no routine batch releases of gaseous effluents from River Bend Station during the reporting period of January 1, 2023 , through December 31, 2023.

2.5 Abnormal Releases

There was one abnormal release in 2023. An unplanned release of radioactive gasses from the Turbine Building occurred from 6/18/2023 to 6/24/2023. Specifically, both west and south roll-up doors were stuck partially open in a manner that exceeded the capacity of the Turbine Building ventilation exhaust fans to maintain a negative pressure in the building. This condition is described in CR-RBS-2023-05282. The release activity was monitored locally with portable air samplers and the release flowrate was measured with handheld anemometers. No ODCM limits were exceeded during this release. A summary of the release is provided in Table 1 below. Plant: River Bend Nuclear Station Year: 2023 Page 10 of 70 Annual Radioactive Effluent Release Report

Table 1, Abnormal Release Summary

Release Duration 8640 minutes Release Volume 6.264E+07 cubic feet

Isotope Total activity (Ci)

Ag-110m 2.86E-07

I-131 1.12E-06

I-133 2.36E-05

Maximum Site Boundary Dose Rate (mRem/yr)

Age Bone Liver Total Body Thyroid Kidney Lung GI-Lli Skin Group

Child 3.653E-05 4.356E-05 1.744E-05 8.852E-03 7.239E-05 1.270E-04 1.308E-05 0.00E+00

Maximum Dose to Members of the Public (mRem)

Age Bone Liver Total Body Thyroid Kidney Lung GI-Lli Skin Group

Child 2.725E-06 2.868E-06 2.210E-06 2.724E-04 3.646E-06 3.777E-06 3.478E-06 1.976E-06

2.6 Major Changes to Radioactive Liquid, Gaseous, and Solid Waste Treatment Systems

Engineering performed a review of the Maximo database to evaluate non-administrative design changes completed or partially completed during 2023 involving the subject systems (i.e. changes classified as evaluations or nuclear changes). These design changes were then reviewed to determine if there have been any major changes to the subject systems. The review was based on a major change being defined as a modification which affected the method of processing or the effluent from the system. Also, to be a major change the change must have affected the Updated Safety Analysis Report (USAR).

No EC was identified as being completed during this time period that modified any radioactive waste system major component such that the processing method or effluent was changed. Also, no changes were identified affecting the method of processing solid, liquid or gaseous waste or the isotopic composition or the quantity of liquid, solid, or gaseous waste as described in the USAR.

In conclusion, no design changes were completed during the specified time period that constituted a major change to either the liquid, solid or gaseous radwaste treatment systems.

Plant: River Bend Nuclear Station Year: 2023 Page 11 of 70 Annual Radioactive Effluent Release Report

2.7 Land Use Census Changes

A Land Use Census was not conducted in 2023. The Land Use Census is performed every two years in accordance with procedure EN-CY-127, as required by the Technical Requirements Manual (TRM) (TR 3.12.2). The results of the Land Use Census are included in the Annual Radiological Environmental Operating Report pursuant to Technical Specification 5.6.2.

2.8 Effluent Monitor Instrument Inoperability

2.8.1 Radioactive Liquid Effluent Monitoring Instrumentation Operability

The minimum number of channels required to be OPERABLE as described in Table 3.3.11.2-1 of Technical Requirement 3.3.11.2 were, if inoperable at any time in the period January 1, 2023, through December 31, 2023, restored to operable status within the required time.

2.8.2 Radioactive Gaseous Effluent Monitoring Instrumentation Operability

The minimum number of channels required to be OPERABLE as described in Table 3.3.11.3-1 of Technical Requirement 3.3.11.3 were, if inoperable at any time in the period January 1, 2023, through December 31, 2023, restored to operable status within the required time.

2.9 Offsite Dose Calculation Manual Changes

There were no changes to the Offsite Dose Calculation Manual in 2023.

2.10 Radiological Environmental Monitoring Program Changes

There were no changes to the Radiological Environmental Monitoring Program during the reporting period January 1, 2023, through December 31, 2023. Process Control Program (PCP) Changes

2.11 Process Control Program (PCP) Changes

There were no changes to the Process Control Program (PCP) in 2023.

2.12 NON-REMP Groundwater Monitoring Results (NEI 07-07)

Ground water samples were taken in support of the Groundwater Protection Initiative (GPI). These samples are not part of the Radiological Environmental Monitoring Program. The sample results for 2023 are located in Table 19, Table 20, and Table 21.

River Bend Station made no NEI 07-07 voluntary notifications in 2023.

2.13 Outside Tanks

The maximum quantity of radioactive material, excluding tritium and dissolved or entrained noble gases, contained in any unprotected outdoor tank during the period of January 1, 2023, through December 31, 2023 was less than or equal to the 10 curie limit as required by Technical Specification 5.5.8.b. Plant: River Bend Nuclear Station Year: 2023 Page 12 of 70 Annual Radioactive Effluent Release Report

2.14 Errata/Corrections to Previous ARERRs

There were no Errata issued or corrections to previous ARERRs for the 2023 reporting period. Plant: River Bend Nuclear Station Year: 2023 Page 13 of 70 Annual Radioactive Effluent Release Report

3.0 GASEOUS EFFLUENTS

3.1 Gas Effluent and Waste Disposal Report

Table 2, Gaseous Effluents-Summation of All Releases

A. Fission & Activation Gases Unit Quarter Quarter Quarter Quarter Annual 1 2 3 4

1. Total Release Ci 3.13E+01 2.18E+02 3.63E+02 1.48E+02 7.60E+02
2. Average release rate for the period PCi/sec 4.03E+00 2.77E+01 4.56E+01 1.86E+01 2.41E+01

B. Iodine

1. Total Iodine-131 Ci 1.10E-03 2.01E-04 1.47E-02 1.03E-03 1.70E-02
2. Average release rate for the period PCi/sec1.41E-04 2.56E-05 1.85E-03 1.29E-04 5.39E-04

C. Particulates

1. Particulates with half-lives > 8 days Ci 1.26E-04 1.38E-04 8.37E-05 4.83E-05 3.96E-04
2. Average release rate for the period PCi/sec1.63E-05 1.75E-05 1.05E-05 6.08E-06 1.26E-05

D. Tritium

1. Total Release Ci 2.25E+00 2.70E-01 1.40E+00 7.79E-01 4.70E+00
2. Average release rate for the period PCi/sec 2.90E-01 3.44E-02 1.76E-01 9.80E-02 1.49E-01

E. Gross Alpha

1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00
2. Average release rate for the period PCi/sec 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

F. Carbon-14

1. Total Release Ci 9.39E-01 3.65E-01 2.76E+00 1.73E+00 5.80E+00
2. Average release rate for the period PCi/sec 1.21E-01 4.65E-02 3.47E-01 2.18E-01 1.84E-01
% of limit is located in the Radiological Impact to Man Table

Plant: River Bend Nuclear Station Year: 2023 Page 14 of 70 Annual Radioactive Effluent Release Report

Table 3, Gaseous Effluents - Ground Level Release - Continuous Mode

Radionuclide Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Released

Fission Gases

Xe-133 Ci 8.71E-01 0.00E+00 0.00E+00 0.00E+00 8.71E-01

Xe-135m Ci 1.25E+00 7.12E-01 5.64E-01 2.61E+00 5.13E+00

Xe-135 Ci 7.12E-01 4.06E-01 3.23E-01 4.45E+01 4.59E+01

Total For Period Ci 2.83E+00 1.12E+00 8.87E-01 4.71E+01 5.19E+01

Iodines

I-131 Ci 3.00E-05 5.01E-06 1.04E-04 6.24E-05 2.02E-04

I-133 Ci 0.00E+00 0.00E+00 9.13E-05 3.99E-05 1.31E-04

Total For Period Ci 3.00E-05 5.01E-06 1.96E-04 1.02E-04 3.33E-04

Particulates

Mn-54 Ci 0.00E+00 1.44E-06 0.00E+00 0.00E+00 1.44E-06

Co-58 Ci 0.00E+00 9.14E-07 0.00E+00 0.00E+00 9.14E-07

Co-60 Ci 8.21E-06 1.92E-05 0.00E+00 1.92E-06 2.93E-05

Zn-65 Ci 2.71E-06 1.88E-05 0.00E+00 0.00E+00 2.15E-05

Total For Period Ci 1.09E-05 4.04E-05 0.00E+00 1.92E-06 5.32E-05

Tritium

H-3 Ci 5.44E-01 1.61E-01 4.89E-01 3.93E-02 1.23E+00

Total For Period Ci 5.44E-01 1.61E-01 4.89E-01 3.93E-02 1.23E+00

Plant: River Bend Nuclear Station Year: 2023 Page 15 of 70 Annual Radioactive Effluent Release Report

Table 4, Gaseous Effluents - Mixed Mode Release - Continuous Mode

Radionuclide Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Released

Fission Gases

Kr-85m Ci 1.68E-01 1.56E-01 0.00E+00 9.39E-01 1.26E+00

Kr-87 Ci 2.33E-02 4.67E-01 0.00E+00 8.21E-01 1.31E+00

Kr-88 Ci 2.33E-01 5.06E-01 0.00E+00 1.75E+00 2.49E+00

Xe-133m Ci 1.80E-01 0.00E+00 0.00E+00 7.48E-01 9.29E-01

Xe-133 Ci 6.21E+00 1.74E+00 1.97E-01 2.75E+01 3.56E+01

Xe-135m Ci 4.55E+00 8.43E+00 0.00E+00 1.33E+01 2.62E+01

Xe-135 Ci 1.71E+01 1.86E+02 3.62E+02 3.11E+01 5.96E+02

Xe-137 Ci 0.00E+00 8.06E+00 0.00E+00 1.25E+01 2.05E+01

Xe-138 Ci 0.00E+00 1.13E+01 0.00E+00 1.23E+01 2.36E+01

Total For Period Ci 2.85E+01 2.17E+02 3.62E+02 1.01E+02 7.08E+02

lodines

I-131 Ci 1.07E-03 1.95E-04 1.46E-02 9.64E-04 1.68E-02

I-133 Ci 8.27E-03 2.37E-03 1.73E-02 6.51E-03 3.45E-02

Total For Period Ci 9.34E-03 2.57E-03 3.19E-02 7.47E-03 5.13E-02

Particulates

Co-60 Ci 0.00E+00 0.00E+00 0.00E+00 1.19E-06 1.19E-06

Sr-89 Ci 8.79E-05 9.01E-05 4.41E-05 4.34E-05 2.65E-04

Ba-140 Ci 2.76E-05 7.19E-06 3.96E-05 1.76E-06 7.62E-05

Total For Period Ci 1.16E-04 9.73E-05 8.37E-05 4.64E-05 3.43E-04

Tritium

H-3 Ci 1.71E+00 1.09E-01 9.07E-01 7.40E-01 3.46E+00

Total For Period Ci 1.71E+00 1.09E-01 9.07E-01 7.40E-01 3.46E+00 Plant: River Bend Nuclear Station Year: 2023 Page 16 of 70 Annual Radioactive Effluent Release Report

Table 5, Radioactive Gaseous Waste Sampling and Analysis Program

Gaseous Release Sampling Minimum Type of Activity Lower Limit of Type Frequency Analysis Analysis Detection (LLD) Frequency uC/ml

M Principle Gamma Main Plant Exhaust M Emitters 1.00E-04 Duct Grab Sample H-3 1.00E-06

Fuel Building M Principle Gamma Ventilation Exhaust M Emitters 1.00E-04 Duct Grab Sample H-3 1.00E-06

Radwaste Building M Principle Gamma Ventilation Exhaust M Emitters 1.00E-04 Duct Grab Sample H-3 1.00E-06

All Release Types I-131 1.00E-12 as listed above Continuous W Charcoal Sample I-133 1.00E-10

Principle Gamma Continuous W Particulate Sample Emitters (I-131, 1.00E-11 Others)

M Continuous Composite Gross Alpha 1.00E-11 Particulate Sample

Q Continuous Composite Sr-89, Sr-90 1.00E-11 Particulate Sample

Noble Gases Continuous Noble Gas Monitor Gross Beta or 1.00E-6 Gamma

W = At least once per 7 days

M = At least once per 31 days

Q = At least once per 92 days

Plant: River Bend Nuclear Station Year: 2023 Page 17 of 70 Annual Radioactive Effluent Release Report

4.0 LIQUID EFFLUENTS

4.1 Liquid Effluent and Waste Disposal Report

Table 6, Liquid Effluents-Summation of All Releases

A Fission & Activation Products Unit Quarter Quarter Quarter Quarter Annual 1 2 3 4

1. Total Release (not including tritium, Ci 8.08E-04 3.18E-03 2.18E-03 9.74E-04 7.13E-03 gases or alpha)
2. Average diluted concentration during Ci/mL 9.96E-10 9.08E-09 1.94E-09 7.47E-10 1.99E-09 period P

B. Tritium 

1. Total Release Ci 7.53E+00 4.36E+00 5.23E+00 1.58E+00 1.87E+01
2. Average diluted concentration during Ci/mL 9.28E-06 1.25E-05 4.66E-06 1.21E-06 5.21E-06 period. P

C. Dissolved & Entrained Gases

1. Total Release Ci 1.32E-02 5.84E-03 4.18E-02 6.96E-03 6.78E-02
2. Average diluted concentration during Ci/mL 1.62E-08 1.67E-08 3.73E-08 5.34E-09 1.89E-08 period P

D. Gross Alpha Activity

1. Total Release Ci 0.0E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

E. Volume Of Waste Released (prior Liters 3.21E+06 3.70E+06 3.83E+06 1.17E+06 1.19E+07 to dilution)

F. Volume Of Dilution Water Used During Liters 8.12E+08 3.50E+08 1.12E+0 1.30E+09 3.59E+09 Period

% oflocatedt to e

Plant: River Bend Nuclear Station Year: 2023 Page 18 of 70 Annual Radioactive Effluent Release Report

Table 7, Liquid Effluents - Batch Release

Radionuclide Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Released

Fission and Activation Products

Cr-51 Ci 1.84E-05 3.36E-06 0.00E+00 0.00E+00 2.17E-05

Mn-54 Ci 9.50E-06 1.65E-04 7.28E-05 6.95E-06 2.55E-04

Co-58 Ci 2.96E-06 1.62E-05 1.76E-05 3.21E-06 3.99E-05

Co-60 Ci 7.02E-04 2.79E-03 9.09E-04 9.33E-04 5.33E-03

Ni-65 Ci 0.00E+00 2.71E-05 2.55E-05 6.75E-06 5.94E-05

Zn-65 Ci 1.10E-05 1.47E-04 2.38E-04 1.42E-06 3.98E-04

Zn-69m Ci 3.14E-07 0.00E+00 0.00E+00 0.00E+00 3.14E-07

Sr-92 Ci 3.12E-06 0.00E+00 0.00E+00 0.00E+00 3.12E-06

Zr-97 Ci 0.00E+00 1.07E-06 0.00E+00 0.00E+00 1.07E-06

Nb-95 Ci 0.00E+00 5.81E-07 0.00E+00 0.00E+00 5.81E-07

Nb-97 Ci 1.79E-06 4.71E-06 2.71E-06 7.79E-06 1.70E-05

Mo-99 Ci 0.00E+00 0.00E+00 0.00E+00 6.05E-06 6.05E-06

Tc-99m Ci 0.00E+00 0.00E+00 0.00E+00 3.57E-07 3.57E-07

Ru-105 Ci 1.70E-06 0.00E+00 0.00E+00 0.00E+00 1.70E-06

Ag-110m Ci 2.08E-05 7.68E-06 3.58E-05 5.96E-07 6.49E-05

Rh-105 Ci 0.00E+00 1.77E-06 0.00E+00 0.00E+00 1.77E-06

Sb-124 Ci 0.00E+00 0.00E+00 3.85E-06 1.34E-06 5.19E-06

Sb-125 Ci 0.00E+00 1.86E-06 6.15E-06 0.00E+00 8.02E-06

Sb-127 Ci 0.00E+00 5.01E-06 0.00E+00 0.00E+00 5.01E-06

I-131 Ci 8.22E-06 0.00E+00 0.00E+00 0.00E+00 8.22E-06

I-132 Ci 0.00E+00 1.53E-06 7.60E-07 0.00E+00 2.29E-06

I-135 Ci 0.00E+00 0.00E+00 1.85E-05 0.00E+00 1.85E-05

Cs-134 Ci 0.00E+00 0.00E+00 5.76E-06 0.00E+00 5.76E-06

Cs-137 Ci 0.00E+00 4.88E-07 2.93E-05 0.00E+00 2.98E-05

Cs-138 Ci 0.00E+00 0.00E+00 0.00E+00 6.21E-06 6.21E-06

Ba-140 Ci 0.00E+00 0.00E+00 1.12E-06 0.00E+00 1.12E-06

Ba-142 Ci 0.00E+00 0.00E+00 7.92E-04 0.00E+00 7.92E-04

Plant: River Bend Nuclear Station Year: 2023 Page 19 of 70 Annual Radioactive Effluent Release Report

Table 7, Liquid Effluents - Batch Release

Fission and Activation Products (Continued)

La-140 Ci 2.00E-05 0.00E+00 7.18E-06 0.00E+00 2.71E-05

La-142 Ci 0.00E+00 2.43E-06 0.00E+00 0.00E+00 2.43E-06

Ce-141 Ci 7.96E-06 0.00E+00 3.24E-06 0.00E+00 1.12E-05

Np-239 Ci 0.00E+00 0.00E+00 7.58E-06 0.00E+00 7.58E-06

Total For Period Ci 2.48E-04 1.25E-03 1.56E-03 2.05E-03 5.10E-03

Tritium

H-3 Ci 7.53E+00 4.36E+00 5.23E+00 1.58E+00 1.87E+01

Total For Period Ci 7.53E+00 4.36E+00 5.23E+00 1.58E+00 1.87E+01

Radionuclide Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Released

Dissolved and Entrained Gases

Kr-85 Ci 2.32E-04 0.00E+00 6.95E-05 0.00E+00 3.01E-04

Kr-88 Ci 0.00E+00 0.00E+00 3.22E-05 1.21E-05 4.43E-05

Kr-89 Ci 0.00E+00 0.00E+00 1.83E-03 0.00E+00 1.83E-03

Xe-131m Ci 0.00E+00 0.00E+00 2.51E-04 0.00E+00 2.51E-04

Xe-133m Ci 2.75E-04 1.31E-04 9.09E-04 1.23E-04 1.44E-03

Xe-133 Ci 7.40E-03 2.42E-03 2.16E-02 3.75E-03 3.52E-02

Xe-135 Ci 5.25E-03 3.29E-03 1.71E-02 3.07E-03 2.88E-02

Xe-138 Ci 0.00E+00 0.00E+00 5.84E-06 0.00E+00 5.84E-06

Total For Period Ci 1.32E-02 5.84E-03 4.18E-02 6.96E-03 6.78E-02

Plant: River Bend Nuclear Station Year: 2023 Page 20 of 70 Annual Radioactive Effluent Release Report

Table 8, Supplemental Information for Liquid Effluents - Batch Mode

Report for 2023 Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Year

Number of releases 59 61 71 17 208

Total Release Time minutes 1.69E+04 1.89E+04 1.99E+04 5.95E+03 6.16E+04

Maximum Release Time minutes 3.47E+02 1.71E+03 3.08E+02 1.41E+03 1.71E+03

Average Release Time minutes 2.87E+02 3.10E+02 2.80E+02 3.50E+02 2.96E+02

Minimum Release Time minutes 9.80E+01 1.00E+00 1.43E+02 2.66E+02 1.00E+00

Units Quarter 1 Quarter 2 Quarter 3 Quarter 4

Average Mississippi River stream flow during periods of release into ft3/sec 650,887 539,637 237,470 171,492 a flowing stream

Plant: River Bend Nuclear Station Year: 2023 Page 21 of 70 Annual Radioactive Effluent Release Report

Table 9, Radioactive Liquid Waste Sampling and Analysis Program

Liquid Release Sampling Minimum Type of Activity Lower Limit of Type Frequency Analysis Analysis Detection (LLD) Frequency uC/ml

Batch Waste Principle Gamma 5.00E-07 Release (Liquid P P Emitters; except 5.00E-06 Radwaste Recovery Each Batch Each Batch Ce-144 Sample Tanks) I-131 1.00E-06

P Dissolved and Each Batch / M M Entrained Gases 1.00E-05 (Gamma Emitters)

P M H-3 1.00E-05 Each Batch Composite Gross Alpha 1.00E-07

P Q Sr-89, Sr-90 5.00E-8 Each Batch Composite Fe-55 1.00E-06

P = Prior to each radioactive release

M = At least once per 31 days

Q = At least once per 92 days

Plant: River Bend Nuclear Station Year: 2023 Page 22 of 70 Annual Radioactive Effluent Release Report

5.0 SOLID WASTE

SUMMARY

5.1 Solid Waste Shipped Offsite for Burial or Disposal (Not Irradiated Fuel)

5.1.1 Types of Waste

Table 10, Types of Solid Waste Summary

Types of Waste Total Quantity Total Activity Est. Total (m3 ) (Ci) Error (%)

a. Spent resins, filter sludges, evaporator bottoms, etc. 5.39E+01 7.94E+02 25
b. Dry compressible waste, contaminated equip, etc. 2.40E+03 3.88E+00 25
c. Irradiated components, control rods, etc. 0.00E+00 0.00E+00 25
d. Other (Water, EHC, Waste Oil, etc.) 0.00E+00 0.00E+00 25

5.1.2 Estimate of major nuclide composition (by waste type) only >1% [Note 1] are reported.

Table 11, Major Nuclides

Major Nuclide Composition Isotope  % Curies

Mn-54 1.01% 8.01E+00

Fe-55 28.02% 2.22E+02

a. Resins, filters, evaporator bottoms, etc. Co-60 65.01% 5.16E+02

Ni-63 1.03% 8.17E+00

Zn-65 2.51% 1.99E+01

Major Nuclide Composition Isotope % Curies

Mn-54 1.71% 6.65E-02

Fe-55 35.20% 1.37E+00

b. Dry compressible waste, contaminated Co-60 53.62% 2.08E+00 equip, etc. Ni-63 1.27% 4.92E-02

Zn-65 3.98% 1.54E-01

Sr-90 1.01% 3.91E-02

c. Irradiated components, control rods, etc. N/A N/A N/A
d. Other (Water, EHC, Waste Oil, Etc.) N/A N/A N/A Determined by Measurement & Correlation.

Packaged in Strong, Tight Liners. Plant: River Bend Nuclear Station Year: 2023 Page 23 of 70 Annual Radioactive Effluent Release Report

No Solidification Agent or Absorbent Used. [Note 1] - Major" radionuclide is equivalent to a principle radionuclide, i.e. greater than 1 percent of total activity.

5.1.3 Solid Waste Disposition

Table 12, Solid Waste Disposition (Specify Site or Unit)

Number of Mode of Transportation Destination Shipments

43 Truck Energy Solutions (Bear Creek) - Oak Ridge, TN

45 Truck Energy Solutions (Memphis) 1790 Dock Street

Table 13, Irradiated Fuel Shipments Disposition

No Irradiated Fuel Shipments for 2023

Number of Mode of Transportation Destination Shipments

N/A N/A N/A Plant: River Bend Nuclear Station Year: 2023 Page 24 of 70 Annual Radioactive Effluent Release Report

6.0 RADIOLOGICAL IMPACT TO MAN

6.1 10CFR Part50, Appendix I Evaluation

Table 14, Dose Assessment

Quarter 1 Quarter 2 Quarter 3 Quarter 4 Annual

Liquid Effluent Dose Limit, 1.5 mrem 1.5 mrem 1.5 mrem 1.5 mrem 3 mrem Total Body

Total Body Dose 2.70E-06 8.58E-05 2.45E-05 2.40E-06 1.15E-04 

                % of Limit                                                                                                                                                                                              1.80E-04 5.72E-03 1.63E-03 1.60E-04 3.84E-03

Liquid Effluent Dose Limit, 5 mrem 5 mrem 5 mrem 10 mrem Any Organ 5 mrem

Maximum Organ Dose 1.29E-05 6.21E-04 1.28E-04 2.21E-05 7.84E-04 

                % of Limit                                                                                                                                                                                              2.57E-04 1.24E-02 2.57E-03 4.42E-04 7.84E-03

Gaseous Effluent Dose 5 mrad 5 mrad 5 mrad 10 mrad Limit, Gamma Air 5 mrad

Gamma Air Dose 1.35E-02 5.81E-02 7.63E-02 1.55E-01 3.03E-01 

                % of Limit                                                                                                                                                                                              2.71E-01 1.16E+00 1.53E+00 3.10E+00 3.03E+00

Gaseous Effluent Dose 10 mrad 10 mrad 10 mrad 10 mrad 20 mrad Limit, Beta Air

Beta Air Dose 1.04E-02 6.80E-02 9.50E-02 1.85E-01 3.59E-01 

                % of Limit                                                                                                                                                                                              1.04E-01 6.80E-01 9.50E-01 1.85E+00 1.79E+00

Gaseous Effluent Organ Dose Limit (Iodine, 7.5 mrem 7.5 mrem 7.5 mrem 7.5 mrem 15 mrem Tritium, Particulates with > 8 day half-life)

Gaseous Effluent Organ Dose (Iodine, Tritium, 4.82E-02 1.06E-02 4.96E-01 4.39E-02 5.99E-01 Particulates with > 8 day half-life) 

                % of Limit                                                                                                                                                                                              6.42E-01 1.42E-01 6.61E+00 5.86E-01 3.99E+00

Plant: River Bend Nuclear Station Year: 2023 Page 25 of 70 Annual Radioactive Effluent Release Report

Table 15, Dose Assessment (continued)

Quarter 1 Quarter 2 Quarter 3 Quarter 4 Annual

Gaseous Effluent Organ Dose Limit (Carbon 7.5 mrem 7.5 mrem 7.5 mrem 7.5 mrem 15 mrem Bounding Calculation)

Gaseous Effluent Organ Dose (Carbon 4.01E-01 1.56E-01 1.18E+00 7.40E-01 2.47E+00 Bounding Calculation) 

      % of Limit         5.34E+00      2.08E+00       1.57E+01       9.86E+00       1.65E+01

6.2 Dose to Members of the Public Inside the Site Boundary

The maximally exposed member of the pubic was calculated to be member of the West Feliciana Parish Sheriff's Office (WFPSO) that opened a substation in a facility within the site boundary beginning in 2019. The office is estimated to be occupied during normal work hours for 2000 hours per year. It should be noted that the liquid effluent pathway dose was not considered since the individual would not engage in activities that would allow exposure to this pathway.

Annual Critical Annual Total Annual Skin Annual Location Organ Dose Body Dose Dose (mrem) Duration Factor (mrem) (mrem)

Alligator Bayou 2.65E-05 1.53E-06 4.72E-07 4.57E-03

Deer Hunters 1.06E-03 1.13E-04 4.40E-05 2.92E-02

Onsite RV Park 2.47E-03 2.64E-04 1.03E-04 6.82E-02

WFPSO Building 8.29E-03 8.85E-04 3.44E-04 2.28E-01 Plant: River Bend Nuclear Station Year: 2023 Page 26 of 70 Annual Radioactive Effluent Release Report

6.3 40CFR Part 190 Evaluation for an Individual in the Unrestricted Area

An assessment (see Table 16) was made of radiation doses to the likely most-exposed member of the public from River Bend and other nearby uranium fuel cycle sources (none within five miles). The annual (calendar year) dose or dose commitment to any MEMBER OF THE PUBLIC, due to releases of radioactivity and to radiation from uranium fuel cycle sources, shall be limited to less than or equal to 25 mrem to the total body or any organ, except the thyroid, which shall be limited to less than or equal to 75 mrem.

Table 16, EPA 40 CFR PART 190 Evaluation

Total Body Thyroid Any Other Organ

Dose Limit 25 mrem 75 mrem 25 mrem

Dose (Excluding C-14) 2.97E-01 6.90E-01 2.98E-01

% of Limit 1.19E+00 9.20E-01 1.19E+00

Dose (Including C-14) 7.91E-01 1.18E+00 2.77E+00

% of Limit 3.17E+00 1.58E+00 1.11E+01

Gaseous dose including a bounding calculation of C-14 dose, direct shine, ISFSI and any other nuclear power related facility within 5 miles of the station are considered when calculating dose compliance with 40 CFR 190. Plant: River Bend Nuclear Station Year: 2023 Page 27 of 70 Annual Radioactive Effluent Release Report

7.0 METEORLOGICAL DATA

Cumulative joint frequency distributions and annual average data for continuous releases are listed below. The meteorological recovery for 2023 was 96%.

7.1 Joint Frequency Distributions

All Stability Classes

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 83 61 79 134 105 155 37 0 0 0 0 0 654

NNE 93 79 74 121 116 67 2 0 0 0 0 0 552

NE 91 47 71 116 133 61 0 0 0 0 0 0 519

ENE 82 96 74 97 76 26 0 0 0 0 0 0 451

E 46 99 83 93 69 26 0 0 0 0 0 0 416

ESE 26 57 93 131 55 25 5 0 0 0 0 0 392

SE 21 53 81 184 176 162 15 0 0 0 0 0 692

SSE 29 35 66 153 113 186 146 0 0 0 0 0 728

S 28 41 76 144 112 150 47 0 0 0 0 0 598

SSW 17 47 74 116 77 105 17 0 0 0 0 0 453

SW 30 69 55 69 92 91 27 0 0 0 0 0 433

WSW 50 82 53 65 77 104 4 0 0 0 0 0 435

W 63 118 42 68 95 119 14 0 0 0 0 0 519

WNW 83 116 62 79 73 91 21 0 0 0 0 0 525

NW 65 93 53 61 77 94 39 0 0 0 0 0 482

NNW 62 70 58 75 94 132 91 0 0 0 0 0 582

TOTAL 869 1163 1094 1706 1540 1594 465 0 0 0 0 0 8431

Number of Calms: 0

Number of Invalid Hours: 329

Number of Valid Hours: 8431

Total Hours for the Period: 8760

Plant: River Bend Nuclear Station Year: 2023 Page 28 of 70 Annual Radioactive Effluent Release Report

Stability Class A

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 0 19 25 60 21 0 0 0 0 0 125

NNE 0 0 2 13 53 42 2 0 0 0 0 0 112

NE 0 0 2 12 53 41 0 0 0 0 0 0 108

ENE 0 0 1 8 41 13 0 0 0 0 0 0 63

E 0 0 1 24 41 20 0 0 0 0 0 0 86

ESE 0 0 2 28 33 21 1 0 0 0 0 0 85

SE 0 0 1 16 56 82 8 0 0 0 0 0 163

SSE 0 0 1 11 27 64 49 0 0 0 0 0 152

S 0 0 2 14 28 64 16 0 0 0 0 0 124

SSW 0 0 0 11 27 63 7 0 0 0 0 0 108

SW 0 0 2 18 54 54 14 0 0 0 0 0 142

WSW 0 0 1 28 64 92 0 0 0 0 0 0 185

W 0 0 2 33 83 104 10 0 0 0 0 0 232

WNW 0 0 1 31 49 61 12 0 0 0 0 0 154

NW 0 0 1 12 33 49 21 0 0 0 0 0 116

NNW 0 0 2 6 34 44 59 0 0 0 0 0 145

TOTAL 0 0 21 284 701 874 220 0 0 0 0 0 2100

Number of Calms: 0

Number of Invalid Hours: 0

Number of Valid Hours: 2100

Total Hours for the Period: 2100

Plant: River Bend Nuclear Station Year: 2023 Page 29 of 70 Annual Radioactive Effluent Release Report

Stability Class B

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 0 2 4 9 4 0 0 0 0 0 19

NNE 0 0 1 3 6 7 0 0 0 0 0 0 17

NE 0 0 1 3 9 1 0 0 0 0 0 0 14

ENE 0 0 0 4 3 0 0 0 0 0 0 0 7

E 0 1 2 2 3 0 0 0 0 0 0 0 8

ESE 0 1 1 4 1 0 0 0 0 0 0 0 7

SE 0 0 2 10 8 0 0 0 0 0 0 0 20

SSE 0 0 1 4 2 11 9 0 0 0 0 0 27

S 0 0 1 2 8 6 1 0 0 0 0 0 18

SSW 0 0 0 2 5 6 1 0 0 0 0 0 14

SW 0 0 1 5 3 2 3 0 0 0 0 0 14

WSW 0 0 2 6 6 4 1 0 0 0 0 0 19

W 0 0 0 2 3 5 0 0 0 0 0 0 10

WNW 0 0 0 1 3 7 1 0 0 0 0 0 12

NW 0 0 0 1 4 6 2 0 0 0 0 0 13

NNW 0 0 1 1 3 10 3 0 0 0 0 0 18

TOTAL 0 2 13 52 71 74 25 0 0 0 0 0 237

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 237

TOTAL HOURS FOR THE PERIOD: 237

Plant: River Bend Nuclear Station Year: 2023 Page 30 of 70 Annual Radioactive Effluent Release Report

Stability Class C

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 2 5 8 14 5 0 0 0 0 0 34

NNE 0 0 2 11 5 2 0 0 0 0 0 0 20

NE 0 0 0 5 10 2 0 0 0 0 0 0 17

ENE 0 0 1 6 5 2 0 0 0 0 0 0 14

E 0 0 2 3 3 0 0 0 0 0 0 0 8

ESE 0 0 3 6 1 0 0 0 0 0 0 0 10

SE 0 0 2 5 3 1 0 0 0 0 0 0 11

SSE 0 0 1 3 2 10 16 0 0 0 0 0 32

S 0 0 0 3 2 5 3 0 0 0 0 0 13

SSW 0 0 0 2 4 1 1 0 0 0 0 0 8

SW 0 0 0 3 4 5 2 0 0 0 0 0 14

WSW 0 0 1 4 3 4 0 0 0 0 0 0 12

W 0 0 0 4 2 3 1 0 0 0 0 0 10

WNW 0 0 0 2 3 4 2 0 0 0 0 0 11

NW 0 0 0 2 4 8 1 0 0 0 0 0 15

NNW 0 0 0 2 3 8 6 0 0 0 0 0 19

TOTAL 0 0 14 66 62 69 37 0 0 0 0 0 248

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 248

TOTAL HOURS FOR THE PERIOD: 248

Plant: River Bend Nuclear Station Year: 2023 Page 31 of 70 Annual Radioactive Effluent Release Report

Stability Class D

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 1 5 8 30 49 65 7 0 0 0 0 0 165

NNE 0 4 9 47 35 13 0 0 0 0 0 0 108

NE 0 5 18 45 49 12 0 0 0 0 0 0 129

ENE 0 2 19 35 17 9 0 0 0 0 0 0 82

E 0 10 15 15 9 5 0 0 0 0 0 0 54

ESE 1 6 21 29 9 3 4 0 0 0 0 0 73

SE 0 3 11 40 40 51 7 0 0 0 0 0 152

SSE 0 2 7 28 37 86 66 0 0 0 0 0 226

S 0 2 14 31 31 59 23 0 0 0 0 0 160

SSW 1 1 10 25 21 29 8 0 0 0 0 0 95

SW 0 4 8 15 23 26 8 0 0 0 0 0 84

WSW 0 1 11 15 3 4 3 0 0 0 0 0 37

W 0 7 13 19 6 6 3 0 0 0 0 0 54

WNW 0 6 12 14 13 15 5 0 0 0 0 0 65

NW 0 4 7 14 20 25 14 0 0 0 0 0 84

NNW 0 2 10 19 29 55 20 0 0 0 0 0 135

TOTAL 3 64 193 421 391 463 168 0 0 0 0 0 1703

NUMBER OF CALMS: 1

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 1703

TOTAL HOURS FOR THE PERIOD: 1703

Plant: River Bend Nuclear Station Year: 2023 Page 32 of 70 Annual Radioactive Effluent Release Report

Stability Class E

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 5 11 33 67 19 3 0 0 0 0 0 0 138

NNE 5 21 36 41 17 3 0 0 0 0 0 0 123

NE 6 19 33 43 12 5 0 0 0 0 0 0 118

ENE 5 21 30 33 9 2 0 0 0 0 0 0 100

E 4 23 27 41 13 1 0 0 0 0 0 0 109

ESE 5 21 39 53 10 1 0 0 0 0 0 0 129

SE 4 18 48 105 69 28 0 0 0 0 0 0 272

SSE 7 15 36 85 40 15 6 0 0 0 0 0 204

S 7 17 44 81 43 16 4 0 0 0 0 0 212

SSW 4 21 54 69 20 6 0 0 0 0 0 0 174

SW 4 36 27 26 8 4 0 0 0 0 0 0 105

WSW 6 28 30 11 1 0 0 0 0 0 0 0 76

W 6 32 15 9 0 0 0 0 0 0 0 0 62

WNW 4 23 28 24 5 4 1 0 0 0 0 0 89

NW 4 19 24 24 14 6 1 0 0 0 0 0 92

NNW 5 19 22 43 25 14 1 0 0 0 0 0 129

TOTAL 81 344 526 755 305 108 13 0 0 0 0 0 2132

NUMBER OF CALMS: 2

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 2132

TOTAL HOURS FOR THE PERIOD: 2132

Plant: River Bend Nuclear Station Year: 2023 Page 33 of 70 Annual Radioactive Effluent Release Report

Stability Class F

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 10 19 13 8 0 0 0 0 0 0 0 0 50

NNE 11 28 21 6 0 0 0 0 0 0 0 0 66

NE 19 11 15 7 0 0 0 0 0 0 0 0 52

ENE 8 19 15 10 1 0 0 0 0 0 0 0 53

E 8 31 24 8 0 0 0 0 0 0 0 0 71

ESE 12 19 25 11 1 0 0 0 0 0 0 0 68

SE 8 23 11 6 0 0 0 0 0 0 0 0 48

SSE 10 13 17 22 5 0 0 0 0 0 0 0 67

S 8 17 15 12 0 0 0 0 0 0 0 0 52

SSW 6 16 10 7 0 0 0 0 0 0 0 0 39

SW 16 22 12 2 0 0 0 0 0 0 0 0 52

WSW 22 31 5 1 0 0 0 0 0 0 0 0 59

W 18 37 10 1 1 0 0 0 0 0 0 0 67

WNW 23 35 10 6 0 0 0 0 0 0 0 0 74

NW 12 14 13 8 2 0 0 0 0 0 0 0 49

NNW 8 20 14 3 0 0 1 0 0 0 0 0 46

TOTAL 199 355 230 118 10 0 1 0 0 0 0 0 913

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 913

TOTAL HOURS FOR THE PERIOD: 913

Plant: River Bend Nuclear Station Year: 2023 Page 34 of 70 Annual Radioactive Effluent Release Report

Stability Class G

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 30 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 67 26 23 3 0 4 0 0 0 0 0 0 123

NNE 77 26 3 0 0 0 0 0 0 0 0 0 106

NE 66 12 2 1 0 0 0 0 0 0 0 0 81

ENE 69 54 8 1 0 0 0 0 0 0 0 0 132

E 34 34 12 0 0 0 0 0 0 0 0 0 80

ESE 8 10 2 0 0 0 0 0 0 0 0 0 20

SE 9 9 6 2 0 0 0 0 0 0 0 0 26

SSE 12 5 3 0 0 0 0 0 0 0 0 0 20

S 13 5 0 1 0 0 0 0 0 0 0 0 19

SSW 6 9 0 0 0 0 0 0 0 0 0 0 15

SW 10 7 5 0 0 0 0 0 0 0 0 0 22

WSW 22 22 3 0 0 0 0 0 0 0 0 0 47

W 39 42 2 0 0 1 0 0 0 0 0 0 84

WNW 56 52 11 1 0 0 0 0 0 0 0 0 120

NW 49 56 8 0 0 0 0 0 0 0 0 0 113

NNW 49 29 9 1 0 1 1 0 0 0 0 0 90

TOTAL 586 398 97 10 0 6 1 0 0 0 0 0 1098

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 1098

TOTAL HOURS FOR THE PERIOD: 1098

Plant: River Bend Nuclear Station Year: 2023 Page 35 of 70 Annual Radioactive Effluent Release Report

All Stability Classes

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 8 29 53 190 232 21 0 0 0 0 533

NNE 0 4 10 34 72 285 162 2 0 0 0 0 569

NE 0 2 8 25 65 274 240 5 0 0 0 0 619

ENE 0 3 7 35 53 168 214 17 1 0 0 0 498

E 0 1 11 42 85 166 126 20 0 0 0 0 451

ESE 0 1 7 27 57 225 390 58 5 0 0 0 770

SE 0 2 4 26 56 168 239 25 3 0 0 0 523

SSE 0 1 5 31 46 134 184 68 1 0 0 0 470

S 0 3 12 34 64 202 236 55 0 0 0 0 606

SSW 0 2 6 35 63 291 220 15 0 0 0 0 632

SW 0 1 8 41 96 262 119 25 1 0 0 0 553

WSW 1 3 8 33 94 250 78 9 0 0 0 0 476

W 0 0 8 54 95 241 110 7 2 0 0 0 517

WNW 0 2 4 38 53 151 91 12 1 0 0 0 352

NW 0 2 5 34 43 156 126 19 1 0 0 0 386

NNW 0 3 1 18 41 168 198 47 0 0 0 0 476

TOTAL 1 30 112 536 1036 3331 2965 405 15 0 0 0 8431

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 329

NUMBER OF VALID HOURS: 8431

TOTAL HOURS FOR THE PERIOD: 8760

Plant: River Bend Nuclear Station Year: 2023 Page 36 of 70 Annual Radioactive Effluent Release Report

Stability Class A

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 0 2 14 41 52 14 0 0 0 0 123

NNE 0 0 0 11 10 46 24 0 0 0 0 0 91

NE 0 0 0 7 9 59 43 0 0 0 0 0 118

ENE 0 0 0 4 8 28 50 0 0 0 0 0 90

E 0 0 0 1 18 42 35 4 0 0 0 0 100

ESE 0 0 0 4 8 35 40 9 0 0 0 0 96

SE 0 0 0 3 8 38 45 5 0 0 0 0 99

SSE 0 0 0 4 8 22 42 14 0 0 0 0 90

S 0 0 0 3 16 36 57 16 0 0 0 0 128

SSW 0 0 1 3 8 40 50 1 0 0 0 0 103

SW 0 0 1 10 25 49 37 8 0 0 0 0 130

WSW 0 0 1 6 25 104 48 2 0 0 0 0 186

W 0 0 1 6 34 136 77 4 1 0 0 0 259

WNW 0 0 0 9 21 51 41 6 1 0 0 0 129

NW 0 0 0 9 17 28 37 5 1 0 0 0 97

NNW 0 0 0 4 8 34 52 25 0 0 0 0 123

TOTAL 0 0 4 86 237 789 730 113 3 0 0 0 1962

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 1962

TOTAL HOURS FOR THE PERIOD: 1962

Plant: River Bend Nuclear Station Year: 2023 Page 37 of 70 Annual Radioactive Effluent Release Report

Stability Class B

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 0 0 1 3 8 2 0 0 0 0 14

NNE 0 0 0 0 3 10 11 0 0 0 0 0 24

NE 0 0 0 1 4 6 13 0 0 0 0 0 24

ENE 0 0 1 2 2 3 7 0 0 0 0 0 15

E 0 0 1 2 3 8 6 3 0 0 0 0 23

ESE 0 0 0 0 2 9 16 3 0 0 0 0 30

SE 0 0 1 1 3 6 19 1 0 0 0 0 31

SSE 0 0 0 1 3 8 15 2 0 0 0 0 29

S 0 0 0 2 2 4 7 3 0 0 0 0 18

SSW 0 0 0 0 1 6 10 0 0 0 0 0 17

SW 0 0 0 2 2 5 4 4 0 0 0 0 17

WSW 0 0 0 2 6 10 5 2 0 0 0 0 25

W 0 0 0 3 3 8 7 0 0 0 0 0 21

WNW 0 0 0 2 1 5 4 1 0 0 0 0 13

NW 0 0 1 1 1 3 7 2 0 0 0 0 15

NNW 0 0 0 0 3 3 11 3 0 0 0 0 20

TOTAL 0 0 4 19 40 97 150 26 0 0 0 0 336

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 336

TOTAL HOURS FOR THE PERIOD: 336

Plant: River Bend Nuclear Station Year: 2023 Page 38 of 70 Annual Radioactive Effluent Release Report

Stability Class C

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 2 1 1 7 20 1 0 0 0 0 32

NNE 0 0 0 1 7 9 7 0 0 0 0 0 24

NE 0 0 1 1 0 13 8 1 0 0 0 0 24

ENE 0 0 0 0 2 7 6 3 0 0 0 0 18

E 0 1 0 2 7 3 7 0 0 0 0 0 20

ESE 0 0 0 2 1 5 12 3 0 0 0 0 23

SE 0 0 0 1 2 3 2 2 0 0 0 0 10

SSE 0 0 0 1 2 1 11 7 0 0 0 0 22

S 0 0 0 0 3 2 6 9 0 0 0 0 20

SSW 0 0 0 0 2 4 5 0 0 0 0 0 11

SW 0 0 0 1 1 4 5 1 0 0 0 0 12

WSW 0 0 0 0 3 4 4 0 0 0 0 0 11

W 0 0 0 1 1 6 3 1 1 0 0 0 13

WNW 0 0 0 0 1 1 4 0 0 0 0 0 6

NW 0 0 0 1 2 4 12 2 0 0 0 0 21

NNW 0 0 0 1 1 4 8 1 0 0 0 0 15

TOTAL 0 1 3 13 36 77 120 31 1 0 0 0 282

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 282

TOTAL HOURS FOR THE PERIOD: 282

Plant: River Bend Nuclear Station Year: 2023 Page 39 of 70 Annual Radioactive Effluent Release Report

Stability Class D

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 2 5 9 40 72 4 0 0 0 0 132

NNE 0 0 1 5 19 64 51 1 0 0 0 0 141

NE 0 0 3 4 21 57 55 4 0 0 0 0 144

ENE 0 1 1 6 11 30 57 7 1 0 0 0 114

E 0 0 4 3 6 26 17 3 0 0 0 0 59

ESE 0 0 1 3 10 34 65 18 5 0 0 0 136

SE 0 0 1 2 7 24 43 9 3 0 0 0 89

SSE 0 0 0 3 8 10 81 40 1 0 0 0 143

S 0 2 3 5 8 32 78 24 0 0 0 0 152

SSW 0 1 1 2 9 40 82 12 0 0 0 0 147

SW 0 1 2 4 7 27 47 11 1 0 0 0 100

WSW 0 0 0 5 10 15 10 5 0 0 0 0 45

W 0 0 1 10 10 29 15 2 0 0 0 0 67

WNW 0 0 0 4 6 16 12 5 0 0 0 0 43

NW 0 0 0 8 4 19 29 9 0 0 0 0 69

NNW 0 2 0 7 7 31 64 16 0 0 0 0 127

TOTAL 0 7 20 76 152 494 778 170 11 0 0 0 1708

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 1708

TOTAL HOURS FOR THE PERIOD: 1708

Plant: River Bend Nuclear Station Year: 2023 Page 40 of 70 Annual Radioactive Effluent Release Report

Stability Class E

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 1 1 17 62 46 0 0 0 0 0 127

NNE 0 0 6 9 11 83 45 1 0 0 0 0 155

NE 0 1 2 7 17 62 67 0 0 0 0 0 156

ENE 0 0 2 9 21 54 49 4 0 0 0 0 139

E 0 0 5 12 23 41 41 10 0 0 0 0 132

ESE 0 1 2 8 10 63 175 21 0 0 0 0 280

SE 0 0 0 8 13 45 82 8 0 0 0 0 156

SSE 0 0 1 1 7 41 26 5 0 0 0 0 81

S 0 1 3 8 10 74 77 3 0 0 0 0 176

SSW 0 1 1 9 8 135 69 2 0 0 0 0 225

SW 0 0 1 10 19 89 21 1 0 0 0 0 141

WSW 0 0 0 6 16 59 9 0 0 0 0 0 90

W 0 0 1 14 12 18 4 0 0 0 0 0 49

WNW 0 0 1 11 10 20 14 0 0 0 0 0 56

NW 0 1 1 5 6 22 22 1 0 0 0 0 58

NNW 0 1 0 1 12 55 41 1 0 0 0 0 111

TOTAL 0 6 27 119 212 923 788 57 0 0 0 0 2132

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 2132

TOTAL HOURS FOR THE PERIOD: 2132

Plant: River Bend Nuclear Station Year: 2023 Page 41 of 70 Annual Radioactive Effluent Release Report

Stability Class F

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 1 6 3 19 14 0 0 0 0 0 43

NNE 0 0 1 3 12 33 14 0 0 0 0 0 63

NE 0 0 1 2 9 36 39 0 0 0 0 0 87

ENE 0 0 0 6 3 23 26 3 0 0 0 0 61

E 0 0 0 12 8 15 14 0 0 0 0 0 49

ESE 0 0 2 5 14 33 69 4 0 0 0 0 127

SE 0 0 1 6 11 35 31 0 0 0 0 0 84

SSE 0 0 2 7 6 17 6 0 0 0 0 0 38

S 0 0 2 6 11 25 8 0 0 0 0 0 52

SSW 0 0 1 5 12 30 3 0 0 0 0 0 51

SW 0 0 1 5 27 42 1 0 0 0 0 0 76

WSW 0 0 2 3 17 31 1 0 0 0 0 0 54

W 0 0 0 8 18 13 1 0 0 0 0 0 40

WNW 0 1 0 3 5 14 7 0 0 0 0 0 30

NW 0 1 2 1 4 18 9 0 0 0 0 0 35

NNW 0 0 0 0 2 16 4 1 0 0 0 0 23

TOTAL 0 2 16 78 162 400 247 8 0 0 0 0 913

NUMBER OF CALMS: 9

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 913

TOTAL HOURS FOR THE PERIOD: 913

Plant: River Bend Nuclear Station Year: 2023 Page 42 of 70 Annual Radioactive Effluent Release Report

Stability Class G

Period of Record: 01/01/2023 - 12/31/2023

Elevation: Primary Sensors - 150 Foot

Wind Speed (meters/second)

Wind 0.22- 0.51- 0.76- 1.1- 1.6- 2.1- 3.1- 5.1- 7.1- 10.1- 13.1- >18.0 Total Direction 0.50 0.75 1.0 1.5 2.0 3.0 5.0 7.0 10.0 13.0 18.0

N 0 0 2 14 8 18 20 0 0 0 0 0 62

NNE 0 4 2 5 10 40 10 0 0 0 0 0 71

NE 0 1 1 3 5 41 15 0 0 0 0 0 66

ENE 0 2 3 8 6 23 19 0 0 0 0 0 61

E 0 0 1 10 20 31 6 0 0 0 0 0 68

ESE 0 0 2 5 12 46 13 0 0 0 0 0 78

SE 0 2 1 5 12 17 17 0 0 0 0 0 54

SSE 0 1 2 14 12 35 3 0 0 0 0 0 67

S 0 0 4 10 14 29 3 0 0 0 0 0 60

SSW 0 0 2 16 23 36 1 0 0 0 0 0 78

SW 0 0 3 9 15 46 4 0 0 0 0 0 77

WSW 1 3 5 11 17 27 1 0 0 0 0 0 65

W 0 0 5 12 17 31 3 0 0 0 0 0 68

WNW 0 1 3 9 9 44 9 0 0 0 0 0 75

NW 0 0 1 9 9 62 10 0 0 0 0 0 91

NNW 0 0 1 5 8 25 18 0 0 0 0 0 57

TOTAL 1 14 38 145 197 551 152 0 0 0 0 0 1098

NUMBER OF CALMS: 0

NUMBER OF INVALID HOURS: 0

NUMBER OF VALID HOURS: 1098

TOTAL HOURS FOR THE PERIOD: 1098

Plant: River Bend Nuclear Station Year: 2023 Page 43 of 70 Annual Radioactive Effluent Release Report

7.2 Stability Class

Table 17, Classification of Atmospheric Stability

Stability Condition Pasquill Categories Hours (Percentage)

Extremely Unstable A 24

Moderately Stable B 3

Slightly Unstable C 3

Neutral D 20

Slightly Stable E 25

Moderately Stable F 11

Extremely Stable G 13

Table 18, Atmospheric Dispersion and Deposition Rates for the Maximum Individual Dose Calculations Analysis Location Ground Level Mixed Mode (meters) Releases Releases Gamma air dose (3) 994 m WNW (Containment) CHI/Q - 421.0 CHI/Q - 33.1 and Beta Air Dose Maximum Receptor (4) 994 m WNW CHI/Q - 421.0 CHI/Q - 33.1 Resident D/Q - 50.3 D/Q - 18.0 Garden Meat animal Immersion Milk animal (5) 7,000 m WNW CHI/Q - 3.58 CHI/Q - .870 D/Q - 0.38 D/Q - .223 Other on-site 115 m ENE CHI/Q - 5977.0 CHI/Q - 407.5 Receptors D/Q - 529.7 D/Q - 46.9

275 m N CHI/Q - 1644.0 CHI/Q - 169.1 D/Q - 345.6 D/Q - 68.4 2500 SW CHI/Q - 34.45 CHI/Q - 4.65 D/Q - 3.35 D/Q - 1.40

Notes: (1) All CHI/Q = 10-7 sec/m3 (2) All D/Q = 10-9 m-2 (3) Maximum offsite location (property boundary) with highest CHI/Q (unoccupied). (4) Maximum hypothetical occupied offsite location with highest CHI/Q and D/Q. (5) No milk animal within 5 miles radius, hypothetical location in worst sector. (6) Other onsite receptors (7) Revisions to X/Q and D/Q can be performed us ing NUREG/CR-2919, XOQDOQ, Computer Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations}}

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