Text

Annual Radiological Environmental Operating Report (PLA-8122)
	ML24149A104
Person / Time
Site:	Susquehanna
Issue date:	05/28/2024
From:	Casulli E; Susquehanna, Talen Energy
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	PLA-8122
	Download: ML24149A104 (1)
	v • d • e

Edward Casulli Site Vice President Susquehanna Nuclear, LLC 769 Salem Bouleyard Berwick, PA 18603 Tel. 570.542.3795 Fax 570.542.1504 Edward.Casulli@talenenergy.com TALEN~

May 28, 2024 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 SUSQUEHANNA STEAM ELECTRIC STATION ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT PLA-8122 ENERGY 10 CFR 50.4 Docket No. 50-387 50-388

Reference:

1) Susquehanna letter to NRC, "Susquehanna Steam Electric Station Annual Radiological Environmental Operating Report (PLA-8095)," dated April 22, 2024 (ADAMS Accession No. ML24 l l 3A284)

In Reference 1, Susquehanna Nuclear, LLC (Susquehanna), submitted the 2023 Annual Radiological Environmental Operating Report in accordance with the SSES Units 1 and 2 Technical Specification 5.6.2. That report inadvertently omitted the last three pages from Table A, Summary of Data for Susquehanna Steam Electric Station. This omission has been documented in the Susquehanna Corrective Action Program. The correctly collated report is attached. This report supersedes the report provided in Reference 1 in its entirety.

There are no new or revised regulatory commitments contained in this submittal.

Should you have any questions regarding this submittal, please contact Ms. Melisa Krick, Manager-Nuclear Regulatory Affairs, at (570) 542-1818.

E. Casulli

Attachment:

.2023 Annual Radiological Environmental Operating Report Copy:

NRC Region I Mr. H. Anagnostopoulos, NRC Region I Ms. J. England, NRC Senior Resident Inspector Ms. A. Klett, NRC Project Manager Mr. M. Shields, PA DEP/BRP

Attachment to PLA-8122 2023 Annual Radiological Environmental Operating Report

SUSQUEHANNA STEAM ELECTRIC STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 2023 Prepared by:

~-----

7=,__ ~-~-:)/-- ~

Francis. J. H(ckey, Sr. Health Physicist Reviewed by:

Kathleen M. Ervin, Sr. Environmental Scientist Approved by:

er-Plant Chemistry/ Environmental Susquehanna Nuclear, LLC 769 Salem Boulevard Berwick, Pennsylvania 18603

SUSQUEHANNA STEAM ELECTRIC STATION Units 1 & 2 2023 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT JANUARY 1 TO DECEMBER 31, 2023 Susquehanna Nuclear, LLC Berwick, PA April, 2023

-i-TABLE OF CONTENTS I. Summary.......................................................................................................................... 1 II. The Radiological Environmental Monitoring Program.............................................. 5 A. Objectives of the Operational REMP................................................................... 8 B. Implementation of the Objectives........................................................................ 9 III. Program Description.................................................................................................... 10 A. Data Interpretation............................................................................................. 10 B. Program Exceptions.......................................................................................... 12 C. Program Changes............................................................................................. 12 D. Quality Assurance Program.............................................................................. 20 E. Summary of Results - Inter-Laboratory Comparison Program......................... 20 IV. Results and Discussion............................................................................................... 24 A. Atmospheric....................................................................................................... 24

1. Air Particulates........................................................................................ 24

2. Air Iodine............................................................................................... 26 B. Direct Radiation................................................................................................. 26 C. Terrestrial.......................................................................................................... 28

1. Milk......................................................................................................... 28

2. Groundwater........................................................................................... 29

3. Drinking Water........................................................................................ 31

4. Food Products......................................................................................... 32 D. Aquatic.............................................................................................................. 33

1. Surface Water......................................................................................... 33

2. Fish......................................................................................................... 34

3. Shoreline Sediment................................................................................. 35 E. Land Use Census.............................................................................................. 37 V. Annotations to Previous AREOR.................................................................................. 38 VI. Conclusions................................................................................................................. 38 VII. References................................................................................................................. 40

-ii-TABLE OF CONTENTS (contd)

Appendix A - Program Summary.................................................................................... A-1 Appendix B - Sample Designation and Locations............................................................ B-1 Appendix C - Data Tables............................................................................................... C-1 Appendix D - Summary of Results from Analytics, Environmental Resource Associates (ERA) and Department of Energy (DOE) - Mixed Analyte Performance Evaluation Program (MAPEP)................................. D-1 Appendix E - REMP Sample Equipment Operability Trending................................. E-1

-iii-LIST OF TABLES 2023 REMP Atypical Sampling Occurrences Table.......................................................... 13 Appendix A Tables Table A Summary of Data for SSES........................................................................ A-2 Appendix B Tables Table B-1 Sampling Locations.................................................................................... B-3 Table B-2 Susquehanna Steam Electric Station Radiological Environmental Monitoring Program.................................................................................... B-8 Appendix C Tables Table C-1 Gross Beta Analyses of Air Particulate Filters Susquehanna Steam Electric Station......................................................................................... C-2 Table C-2 Gamma Spectroscopic Analyses of Composited Air Particulate Filters Susquehanna Steam Electric Station....................................................... C-4 Table C-3 Iodine-131 Analyses of Air Iodine Samples Susquehanna Steam Electric Station......................................................................................... C-5 Table C-4 Environmental Optically Stimulated Luminescence Dosimetry Results Susquehanna Steam Electric Station....................................................... C-7 Table C-5 Iodine-131 and Gamma Spectroscopic Analyses of Milk Susquehanna Steam Electric Station.............................................................................. C-10 Table C-6 Tritium and Gamma Spectroscopic Analyses of Groundwater Susquehanna Steam Electric Station....................................................... C-12

-iv-LIST OF TABLES (contd)

Table C-7 Annual Average Tritium Concentration in Precipitation, Monitoring Wells and Lake Took-a-While (LTAW) Surface Water Data Susquehanna Steam Electric Station....................................................... C-14 Table C-8 Gross Beta, Tritium and Gamma Spectroscopic Analyses of Drinking Water Susquehanna Steam Electric Station............................................ C-15 Table C-9 Gamma Spectroscopic Analyses of Food Products (Fruits, Vegetables, and Broadleaf) Susquehanna Steam Electric Station.......... C-16 Table C-10 Tritium and Gamma Spectroscopic Analyses of Surface Water Susquehanna Steam Electric Station....................................................... C-17 Table C-11 Gamma Spectroscopic Analyses of Fish Susquehanna Steam Electric Station...................................................................................................... C-19 Table C-12 Gamma Spectroscopic Analyses of Shoreline Sediment Susquehanna Steam Electric Station.............................................................................. C-20 Appendix D Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services............................................ D-2 Table D-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services............................. D-4 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services............................................ D-5 Appendix E Table Table E-1 REMP Sample Equipment Operability Trending Susquehanna Steam Electric Station......................................................................................... E-2

-v-LIST OF MAPS Map B-1 Direct Radiation Monitoring Locations Within One Mile.............................. B-10 Map B-2 Direct Radiation Monitoring Locations From One to Five Miles.................. B-11 Map B-3 Direct Radiation Monitoring Locations Greater than Five Miles.................. B-12 Map B-4 Environmental Sampling Locations Within One Mile.................................. B-13 Map B-5 Environmental Sampling Locations From One to Five Miles...................... B-14 Map B-6 Environmental Sampling Locations Greater than Five Miles...................... B-15 LIST OF FIGURES Figure 1 Radiation Pathways..........................................................................................7 Figure 2 Sources of Radiation Exposure in the U.S.......................................................8 Figure C-1 Gross Beta Activity in Air Particulates......................................................... C-21 Figure C-2 Ambient Radiation Levels Based on Environmental Dosimetry Data............................................................................................................ C-22 Figure C-3 Iodine-131 Activity in Milk........................................................................... C-23 Figure C-4 Annual Average Tritium Activity in Precipitation and Surface Water Versus Ground Water...................................................................... C-24 Figure C-5 Gross Beta Activity in Drinking Water......................................................... C-25 Figure C-6 Tritium Activity in Surface Water................................................................. C-26

I.

Summary During normal operations of a nuclear power generating station there are permitted releases of small amounts of radioactive material to the environment. To monitor and determine the effects of these releases a Radiological Environmental Monitoring Program (REMP) has been established around the Susquehanna Steam Electric Station (SSES). The results of the REMP are published annually, providing a summary and interpretation of the data collected.

Applied Ecoscience, Inc. was responsible for the collection of environmental samples during 2023. Teledyne Brown Engineering (TBE) was responsible for the analysis of environmental samples during 2023. The results are discussed in this report. Landauer provided the dosimetry services for SSES during 2023.

This Annual Radiological Environmental Operating Report (AREOR) conducted for SSES covers the period January 1, 2023 through December 31, 2023. During that time period, 1352 analyses were performed on 1163 samples.

Historically, Tritium (H-3) has been the only man-made radionuclide detected in the environment by the Susquehanna Steam Electric Station (SSES)

Radiological Environmental Monitoring Program (REMP) that is attributable to station operations.

Based on data from the 2023 Radioactive Effluent Monitoring and Control program, approximately 14 Curies of H-3 were discharged in liquid radwaste releases to the Susquehanna River and approximately 55 Curies of H-3 were discharged from the station in airborne effluent releases. H-3 was not identified in any REMP surface water samples taken from the Susquehanna River during 2023. The 2023 average dilution factor for the Susquehanna River was 613, based on the annual average river flow of 7.04E+06 gpm and the annual average cooling tower blowdown flow of 1.15E+04 gpm.

H-3 was identified above analysis detection levels in precipitation samples taken on-site during 2023. Precipitation is analyzed to assess the impact of airborne effluent H-3 on groundwater activities.

H-3 was not identified in any on-site groundwater samples during 2023.

Assuming a Member of the Public was consuming the water from the highest Minimum Detectable Concentration (MDC) of an onsite monitoring well sample, the theoretical dose to the total body and maximum organ using the H-3 concentration of 398 pCi/liter and Regulatory Guide 1.109 methodology

[Reference 9] was determined to illustrate the effect. The calculated dose would be <0.02 mrem to the child total body and <0.02 mrem to the child liver (critical age group/organ) which is well below SSES Technical Requirements Manual (TRM) limits and applicable regulatory limits.

The REMP Sample Equipment Operability and year-to-year trend comparison is located in Appendix E, Table E-1.

The REMP was conducted in accordance with the SSES Technical Requirements Manual (TRM) and the Offsite Dose Calculation Manual (ODCM) [Reference 5] which are based on the design objectives in 10CFR Part 50, Appendix I, Sections IV.B.2, IV.B.3 and IV.C. The Lower Limit of Detection (LLD) values required by the TRM and SSES ODCM were achieved for the 2023 reporting period. The REMP objectives were also met during this period. The concentration of radioactive material in the environment that could be attributable to SSES operations was only a small fraction of the concentration of naturally occurring and man-made radioactivity. Since these results were comparable to the results obtained during the preoperational phase of the program and combined with historical results collected since commercial operation, it can be concluded that the levels and fluctuations were as expected and that the operation of the SSES had no significant radiological impact on the environment. Additionally, the REMP sample results for 2023 verify the adequacy of the SSES radioactive effluent control systems.

Samples of air particulates, air iodine, milk, groundwater, drinking water, food products, surface water, fish and sediment were collected and analyzed.

External radiation dose measurements were also made in the vicinity of SSES using passive dosimeters.

Air particulate samples were analyzed for concentrations of gross beta weekly and gamma emitting nuclides quarterly. Gross beta and cosmogenically produced beryllium-7 (Be-7) were detected at levels consistent with those detected in previous years. No fission or activation products were detected.

Air charcoal cartridge samples were analyzed for iodine-131 (I-131). All results were less than the minimum detectable concentration.

Environmental gamma radiation measurements were performed quarterly using optically stimulated luminescent dosimeters (OSLD). The levels of radiation detected were consistent with those observed in previous years.

Cow milk samples were analyzed for gamma emitting nuclides. High sensitivity I-131 analyses were performed on cow milk samples. All I-131 results were below the minimum detectable concentration. Naturally occurring potassium-40 (K-40) was detected at levels consistent with those detected in previous years. No fission or activation products were detected.

Groundwater samples were analyzed for concentrations of tritium and gamma emitting nuclides. Tritium activities were not detected above minimum detectable concentration. No fission or activation products were detected.

Drinking water samples were analyzed for concentrations of tritium, gross beta and gamma emitting nuclides. Gross beta activities detected were consistent with those detected in previous years. No fission or activation products were detected.

Food product (fruits, vegetables and broadleaf vegetation) samples were analyzed for concentrations of gamma emitting nuclides. Naturally occurring Be-7 and K-40 were detected at levels consistent with those detected in previous years. No fission or activation products were detected.

Surface water samples were analyzed for concentrations of tritium and gamma emitting nuclides. Tritium activities were not detected above the minimum detectable concentration. No fission or activation products were detected.

Fish and shoreline sediment samples were analyzed for concentrations of gamma emitting nuclides. Naturally occurring K-40 was detected at levels consistent with those detected in previous years. Naturally occurring radium-226 (Ra-226), actinium-228 (Ac-228), and thorium-228 (Th-228) were detected in shoreline sediment at levels consistent with results in previous years. No fission or activation products were detected in fish or sediment samples.

II.

The Radiological Environmental Monitoring Program The Susquehanna Steam Electric Station (SSES) is a nuclear electrical generating station located approximately 5 miles northeast of Berwick, in Luzerne County, Pennsylvania. The station consists of two boiling-water reactor generating units. The SSES is located on approximately a 1,087-acre tract just west of the Susquehanna River. The station was constructed in the 1970s, with Unit 1 beginning commercial operation on June 8, 1983, and Unit 2 beginning commercial operation on February 12, 1985. Units 1 and 2 each generate a net 1,350 megawatts (MWe), for a total station output of 2,700 MWe.

In the 4th quarter of 2021, Susquehanna Nuclear, LLC land ownership was reduced due to land transfers to other Talen Energy entities. Impacts to the SSES REMP resulting from the above referenced land ownership changes are being implemented as appropriate by SSES Chemistry personnel.

In total Susquehanna Nuclear, LLC presently owns 1,152 acres of land.

Generally, this land is characterized by open deciduous woodlands interspersed with grasslands. The area around the site is primarily rural, consisting predominately of forest and agricultural lands.

Approximately 1,087 acres of land is jointly owned between Susquehanna Nuclear, LLC (90%) and Allegheny Electric Cooperative (10%). The land use includes generation and associated maintenance facilities, laydown areas, parking lots, roads, a nature preserve (the Susquehanna Riverlands), and agricultural leases to local farmers.

To the north of the station along the Susquehanna River, Susquehanna Nuclear, LLC owns 100% of the 65-acre Gould Island.

More specific information on the demography, hydrology, meteorology, and land use characteristics of the area in the vicinity of the SSES can be found in the Environmental Report [Reference 1], the Final Safety Analysis Report

[Reference 2] and the Final Environmental Statement [Reference 3] for the SSES.

The SSES has maintained a Radiological Environmental Monitoring Program (REMP) since April 1972, prior to construction of both units and ten years prior to the initial operation of Unit 1 in September 1982. The purpose of the preoperational REMP (April, 1972 to September, 1982) was to establish a baseline for radioactivity in the local environment that could be compared with the radioactivity levels observed in various environmental media throughout the operational lifetime of the SSES. This comparison facilitates assessments of the radiological impact of the SSES operation.

The REMP supplements the results of the radioactive effluent-monitoring program by verifying that the measurable concentrations of radioactive materials and levels of radiation in the environment are not higher than expected based on the effluent measurements and modeling of the environment in the vicinity of the SSES.

The pathways through which radiation or radioactive material may reach the public from nuclear power plants are direct exposure from the station, atmospheric, terrestrial, and aquatic pathways. (Figure 1 depicts these pathways)

Figure 1 - Radiation Pathways People are exposed to radiation every day of their lives and have been since the dawn of mankind. Some of this radiation is naturally occurring while some is manmade. There are many factors that will determine the amount of radiation individuals will be exposed to such as where they live, medical treatments, etc. The average person in the United States is exposed to approximately 620 mrem each year. 31 O mrem comes from natural sources and 310 from man-made sources. Figure 2 shows what the typical sources of radiation in the U.S.

Figure 2 - Sources of Radiation Exposure in the U.S.

Sources ofR.Eldlatlon Exposure in the U.S.

Terre$trial {Soil) - 3°/Q lntemal-5%

Natural Sourc:es. - 50%

~31 o millirem {0.31 rem)

Industrial and 0* CCU ti ri I

..... pa o a

<0:1%

Consumer ""'2%

Manmade Sources - 50%

,..31 o millirem {0,31 A:'lm.)

Soun;e:.N(ffl>Repon No. '160 {2009]

Ml~'is availab~ on the NCRPwe,miieat ~.NatPom~

Radioanalytical data from samples collected under the REMP were compared with results from the preoperational phase and historical results during operations. Differences between these periods were examined statistically to determine the effects of station operations. This report presents the results from January 1 through December 31, 2023, for the SSES Radiological Environmental Monitoring Program (REMP).

A.

Objectives of the Operational REMP The objectives of the Operational REMP are to:

1.

Document compliance with SSES REMP Technical Requirements and radiological environmental surveillances.

2.

Verify proper implementation of SSES radiological effluent controls.

3.

Identify, measure and evaluate trends of radionuclide concentrations in environmental pathways near SSES.

4.

Assess impact of SSES Effluents on the Environment and the public.

5.

Verify that SSES operations have no detrimental effects on the health and safety of the public or on the environment.

B.

Implementation of the Objectives

1.

In order to meet the objectives, an operational REMP was developed. Samples of various media were selected for monitoring due to the radiological dose impact to humans and other organisms. The selection of samples was based on:

(a)

Established critical pathways for the transfer of radionuclides through the environment to man, and (b)

Experience gained during the preoperational phase.

Sampling locations were determined based on local meteorology, Susquehanna River hydrology, local demography, and land uses.

2.

Sampling locations were divided into two classes, indicator and control. Indicator locations were sited where it is expected that radiation and radioactive material that might originate from the station would be detectable. Control locations were selected in areas where they would be unaffected by station operations (i.e. Susquehanna River upstream from the station, >10 miles from the station in least prevalent wind directions). Fluctuations in the levels of radionuclides and direct radiation at indicator locations were evaluated with respect to analogous fluctuations at control locations. Indicator and control location data were also evaluated relative to preoperational data.

3.

Appendix A, Program Summary, describes and summarizes the analytical results in accordance with the SSES Technical Specifications.

4.

Appendix B, Sample Designation and Locations, describes the coding system which identifies sample type and location. Table B-1 lists the location codes, locations, latitude, longitude, and the types of samples collected at each location. Table B-2 contains sample medium, analysis and sampling details.

5.

The sampling locations are indicated on the following maps:

Map B-1, Direct Radiation Monitoring Locations Within One Mile Map B-2, Direct Radiation Monitoring Locations From One to Five Miles Map B-3, Direct Radiation Monitoring Locations Greater Than Five Miles Map B-4, Environmental Sampling Locations Within One Mile Map B-5, Environmental Sampling Locations From One to Five Miles Map B-6, Environmental Sampling Locations Greater Than Five Miles III.

Program Description A.

Data Interpretation Results of analyses are grouped according to sample type and presented in Appendix C, Data Tables. All results above the Lower Limit of Detection (LLD) are at a confidence level of +/- 2 sigma. This represents the range of values into which 95% of repeated analyses of the same sample should fall. As defined in U.S. Nuclear Regulatory Commission Regulatory Guide 4.8 [Reference 6], LLD is the smallest concentration of radioactive material in a sample that will yield a net count (above system background) that will be detected with 95%

probability, with only 5% probability of falsely concluding that a blank observation represents a "real signal." LLD is normally calculated as 4.66 times the standard deviation of the background counting rate, or of the blank sample count, as appropriate, divided by counting efficiency, sample size, 2.22 (dpm per picocurie), the radiochemical yield when applicable, the radioactive decay constant and the elapsed time between sample collection and time of counting. LLD represents the capability of the measurement system.

The Minimum Detectable Concentration (MDC) is defined as the smallest concentration of radioactive material that can be detected at a given confidence level. The MDC differs from the LLD in that the MDC takes into consideration the interference caused by the presence of other nuclides while the LLD does not. MDC is an indicator of the performance of the measurement system. The MDC is set to be below the LLD.

Summaries of the radionuclide average picocurie activities and ranges are included in Table A. If a radionuclide was not detected, zero was used for that isotope in dose calculations and the activity is listed as

<MDC (less than the minimum detectable concentration) in Table A.

<MDC indicates that no activity was positively detected in any sample when samples were analyzed with techniques which achieved the required Lower Limits of Detection (LLD). The following are typical measurement laboratory MDCs for airborne and waterborne REMP samples.

Airborne REMP Typical MDCs Radionuclide MDC (pCi/cu.m.)

Mn-54 1.1 E-03 Fe-59 6.6 E-03 Co-58 1.8 E-03 Co-60 1.1 E-03 Zn-65 2.8 E-03 Cs-134 1.0 E-03 Cs-137 9.7 E-04 I-131 3.2 E-01 Waterborne REMP Typical MDCs Radionuclide MDC (pCi/L.)

H-3 (DIST) 2.5 E+02 Mn-54 3.7 E+00 Fe-59 1.1 E+01 Co-58 3.8 E+00 Co-60 4.1 E+00 Zn-65 7.7 E+00 Cs-134 3.7 E+00 Cs-137 4.0 E+00 I-131 9.5 E+00 H-3 2.5 E+02 Gross Beta 1.9 E+00 The grouped data were averaged and standard deviations calculated.

Thus, the +/- 2 sigma of the averaged data represent sample and not analytical variability. For reporting and calculation of averages, any result occurring at or below the LLD is considered to be at the LLD level.

B.

Program Exceptions See Exceptions Table 2023 REMP Atypical Sampling Occurrences C.

Program Changes In 2023, Direct Radiation Monitoring locations 9S3 and 9S4 and surface water grab sample locations 4S7 and LTAW were added to the REMP in 2023.

2023 REMP Atypical Sampling Occurrences Date Sample Location Sample Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Air 10S3 01/11/23 to 01/18/23 CA#23-02 CR 2023-01221 Power outage-date and time unknown.

01/18/23: No action required. Air monitor Loss of 0.4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months , as determined by timer box resumed normal operation when power was during weekly collection.

restored.

01/18/23: Operability verified@ 0947 hours0.011 days 0.263 hours 0.00157 weeks 3.603335e-4 months .

Non-continuous sampler operation.

Ideal sample collected for sample period:

23,200 cf.

z

<(

Surface 6S6 01/23/23 to 01/31/23 (week 5 January composite)

CA #23-03 CR 2023-01684 Water While l&C was performing monthly preventative 01/26/23: l&C restored sampler to service@

maintenance on 01/26/23, sampler flow lines were 1358 hours0.0157 days 0.377 hours 0.00225 weeks 5.16719e-4 months .

found to be clogged. Composite sampler 01/27/23: Operability verified@ 1335 hours0.0155 days 0.371 hours 0.00221 weeks 5.079675e-4 months .

continued to collect samples from water in flow line.

Ideal sample collected for week 5 sample period.

Week 5 composite sample was used in January composite.

Air 12S1 02/01/23 to 02/08/23 CA #23-04 CR 2023-02351 Pump malfunction during sampling period. Surge 02/08/23: Pump would not restart and was protector was tripped upon arrival and pump replaced.

m would not restart. Sampler ran for 46.9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months for 02/08/23: Operability verified @ 1340 hours0.0155 days 0.372 hours 0.00222 weeks 5.0987e-4 months .

w sampling period, according to the timer box.

u.

Less than ideal sample collected for sample Non-continuous sampling during sample period.

period: 6,200 cf.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sample Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Surface 6S6 03/07/23 to 03/13/23 (weeks 2 & 3 March CA #23-05 CR 2023-03946 & CR 2023-03961 Water composite) 03/13/23: l&C replaced flow indicator and While l&C was performing monthly preventative restored sampler to service @ 1307 hours0.0151 days 0.363 hours 0.00216 weeks 4.973135e-4 months 0:::

maintenance on 03/13/23, sampler flow indicator (week 3 March start).

was found cracked and leaking. March week 2 03/13/23: Operability verified @ 1413 hours0.0164 days 0.393 hours 0.00234 weeks 5.376465e-4 months .

stop on 03/13/23 @ 0955 hours0.0111 days 0.265 hours 0.00158 weeks 3.633775e-4 months .

Ideal samples collected for weeks 2 & 3 sample Weeks 2 & 3 composite samples were used in periods.

March composite.

Air 3S2 04/19/23 to 04/26/23 CA #23-06 CR 2023-07890 Power outage began on 04/25/23 @ 0650 hours0.00752 days 0.181 hours 0.00107 weeks 2.47325e-4 months .

04/26/23: Operations reset breaker@ 1336 Breaker was tripped in back-up Met Tower upon hours. Air monitor resumed normal operation arrival. Pump malfunction during sampling when power was restored, and pump was 0:::

period. Metal shavings found in AP/C cabinet.

replaced.

a. <

Loss of 30.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months , as determined by timer box.

04/26/23: Operability verified @ 1337 hours0.0155 days 0.371 hours 0.00221 weeks 5.087285e-4 months .

Non-continuous sampler operation.

Ideal sample collected for sample period:

17,500 cf.

Surface 6S6 04/25/23 to 05/02/23 (week 1 May composite)

CA #23-07 CR 2023-07950 Water Operations reported ACS overflow at river intake 04/28/23: Sample container emptied and new on 04/27/23. Invalid sample due to unknown start time of 1613 hours0.0187 days 0.448 hours 0.00267 weeks 6.137465e-4 months for week 1 May time frame of overflow. No visible leaks in composite. Operability verified@ 1613 hours0.0187 days 0.448 hours 0.00267 weeks 6.137465e-4 months .

sample lines inside ACS.

04/28/23: Grab sample collected @ 5S9 @

1651 hours0.0191 days 0.459 hours 0.00273 weeks 6.282055e-4 months .

Week 1 delayed start composite sample used in May composite. 5S9 grab sample sent for Ideal sample volume collected for week 1 May comparative analysis.

composite.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sample Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Surface 6S6 04/28/23 to 05/02/23 (week 1 May composite)

CA #23-08 CR 2023-08265 Water Diminished flow (<2 gpm) at ACS during week 1 05/02/23: Generated CR requesting FIN/l&C May collection.

perform maintenance ASAP.

05/18/23: l&C began maintenance on ACS lines.

Week 1 delayed start composite sample used in 05/24/23: Sampler restored to service and May composite.

operability verified @ 0929 hours0.0108 days 0.258 hours 0.00154 weeks 3.534845e-4 months .

Ideal sample volume collected for week 1 May

+l composite.

s::::

0 0

Surface 6S6 05/15/23 to 05/29/23 (weeks 4 & 5 May CA #23-09 CR 2023-09467 Water composite) 05/18/23: Week 4 May composite early stop @

<(

~

Plastic pipe broke while l&C performed 1227 hours0.0142 days 0.341 hours 0.00203 weeks 4.668735e-4 months . Grab sample @ 5S9 collected @

maintenance on sampler.

1618 hours0.0187 days 0.449 hours 0.00268 weeks 6.15649e-4 months .

05/24/23: Sampler returned to service and Weeks 4 & 5 composite samples with known stop operability verified @ 0929 hours0.0108 days 0.258 hours 0.00154 weeks 3.534845e-4 months . (Week 5 May and start times were used in May composite.

composite start time.)

Grab sample @ 5S9 collected 05/18/23 was sent for comparative analysis.

Ideal sample volumes collected for weeks 4 & 5 May composite.

Surface 6S6 05/29/23 to 06/05/23 (week 1 June composite)

CA #23-10 CR 2023-10316 Water Continuous water flow while l&C was performing 06/05/23: Week 1 sample stopped @ 1353 monthly preventative maintenance on 06/05/23.

hours.

06/07/23: l&C restored sampler to service@

Week 1 composite sample with known stop date 1124 hours0.013 days 0.312 hours 0.00186 weeks 4.27682e-4 months (week 2 June delayed start time).

z and time was used in June composite. Grab Operability verified @ 1140 hours0.0132 days 0.317 hours 0.00188 weeks 4.3377e-4 months .

)

sample collected 06/07/23 was sent for 06/07/23: Grab sample@ 5S9 collected@ 1227 comparative analysis.

hours.

Ideal sample collected for week 1 June composite.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sam pie Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Surface 6S6 06/07/23 to 06/12/23 (week 2 June composite)

CA #23-11 CR 2023-10557 Water Greater than normal sample volume for week 2 06/12/23: Request FIN/l&C perform maintenance June sampling period. Sample was contained in ASAP to avoid future overflow conditions.

collection container.

06/27/23: l&C performed maintenance.

Operability verified @ 1318 hours0.0153 days 0.366 hours 0.00218 weeks 5.01499e-4 months .

Week 2 June composite sample used in June composite.

Ideal sample collected for week 2 June composite.

Air

3S2, 06/06/23 to 06/12/23 CA #23-12 CR 2023-10564 C:

13S6, Excessive filter loading due to smoke from 06/12/23: Samplers resumed normal operation 0

0

12S1, Canadian wildfires. Less than ideal sample when filters were exchanged for next sampling

-z

10S3, volumes and less than procedural flow rates for period.

12E1, all locations for sampling period.

06/12/23: Operability verified@ 1147 hours0.0133 days 0.319 hours 0.0019 weeks 4.364335e-4 months

8G1, (3S2), 1158 hours0.0134 days 0.322 hours 0.00191 weeks 4.40619e-4 months (13S6), 1204 hours0.0139 days 0.334 hours 0.00199 weeks 4.58122e-4 months (12S1),

981 Continuous sampler operation.

1212 hours0.014 days 0.337 hours 0.002 weeks 4.61166e-4 months (10S3), 1238 hours0.0143 days 0.344 hours 0.00205 weeks 4.71059e-4 months (12E1), 1329 hours0.0154 days 0.369 hours 0.0022 weeks 5.056845e-4 months (8G1), and 1221 hours0.0141 days 0.339 hours 0.00202 weeks 4.645905e-4 months (981).

Less than ideal samples collected for sample period: 7,700 cf (3S2), 7,800 cf (13S6), 7,500 cf (12S1), 8,100 cf (10S3), 6,900 cf (12E1), 10,200 cf (BG1), and 6,600 cf (981).

Air 981 07/26/23 to 08/02/23 CA #23-13 CR 2023-12773 Timer box malfunction. Timer box failed to 08/02/23: Timer box reset and monitored.

advance past 0.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months for the week.

Equipment restored to service @ 1003 hours0.0116 days 0.279 hours 0.00166 weeks 3.816415e-4 months .

(!)

No effect on monitoring.

08/02/23: Operability verified @ 1015 hours0.0117 days 0.282 hours 0.00168 weeks 3.862075e-4 months .

<(

Continuous sampler operation.

Ideal sample collected for sample period:

23,100 cf.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sample Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Air 12S1 08/16/23 to 08/23/23 (Loss of 12kV power)

CA #23-14 CR 2023-13780 No power at air monitor upon arrival or departure.

08/24/23: Air monitor resumed normal operation Loss of power on 08/23/23 @ 0005 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months . Loss of when power was restored @ 1415 hours0.0164 days 0.393 hours 0.00234 weeks 5.384075e-4 months . Late C

0 9.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months of sampling as determined by timer box.

start for sampling period 08/23/23 to 08/30/23.

0 08/24/23: Operability verified @ 1932 hours0.0224 days 0.537 hours 0.00319 weeks 7.35126e-4 months .

(!)

Non-continuous sampler operation.

=>

Ideal sample collected for sample period:

<(

21,200 cf.

Air 12S1 09/06/23 to 09/12/23 (Loss of 12kV power)

CA #23-15 CR 2023-14670 Loss of power on 09/08/23 @ 1020 hours0.0118 days 0.283 hours 0.00169 weeks 3.8811e-4 months .

09/08/23: Air monitor resumed normal operation Loss of 2.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months , as determined by timer box for when power was restored.

sampling period.

09/11 /23: Operability verified @ 1915 hours0.0222 days 0.532 hours 0.00317 weeks 7.286575e-4 months .

Non-continuous sampler operation.

Ideal sample collected for sample period:

18,000 cf.

a..

w Air 9B1 09/06/23 to 09/12/23 CA #23-16 CR 2023-14817 en Timer box malfunction. Timer box failed to 09/12/23: Timer box #9 replaced with timer box advance past 48.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months for sampling period.

7. Equipment restored to service@ 0744 No effect on monitoring.

hours.

09/12/23: Operability verified @ 0750 hours0.00868 days 0.208 hours 0.00124 weeks 2.85375e-4 months .

Continuous sampler operation.

Ideal sample collected for sample period:

19,200 cf.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sample Period Corrective Action Type Code(s)

Reason for Occurrence(s)

Air 9B1 10/03/23 to 10/11 /23 CA #23-17 CR 2023-16326 Power outage-date and time unknown.

10/11/23: No action required. Air monitor Loss of 12.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months , as determined by timer box resumed normal operation when power was I-during weekly collection.

restored.

u 10/11/23: Operability verified @ 1007 hours0.0117 days 0.28 hours 0.00167 weeks 3.831635e-4 months .

0 Non-continuous sampler operation.

Ideal sample collected for sample period:

25,000 cf.

Surface 6S6 11/06/23 to 11/20/23 (weeks 2 & 3 November CA #23-18 CR 2023-17829 Water composite) 11/14/23: Request l&C perform maintenance No sample flow at ACS upon arrival for week 2 ASAP.

November composite collection.

11/14/23: 5S9 grab sample collected@ 1212 hours0.014 days 0.337 hours 0.002 weeks 4.61166e-4 months .

Inadequate sample volumes for weeks 2 & 3 11/20/23: 5S9 grab sample collected@ 1120 November composite. 5S9 grab samples hours.

collected for weeks 2 & 3 November.

11/20/23: l&C performed maintenance and restored operability of sampler. Operability verified@ 1512 hours0.0175 days 0.42 hours 0.0025 weeks 5.75316e-4 months (week 4 November start).

Inadequate sample volumes collected for weeks 0 z 2 & 3 November composite. 5S9 grab composite sent for analysis for weeks 2 & 3.

Air 9B1 11 /15/23 to 11 /21 /23 CA #23-19 CR 2023-18110 Timer box malfunction. Timer box failed to 11/21/23: Timer box #7 replaced with timer box advance past 53.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months for sampling period.

2.

No effect on monitoring.

11/21/23: Operability verified@ 1018 hours0.0118 days 0.283 hours 0.00168 weeks 3.87349e-4 months .

Continuous sampler operation.

Ideal sample collected for sample period:

19,200 cf.

2023 REMP Atypical Sampling Occurrences (continued)

Date Sample Location Sample Period Corrective Action Tvoe Code(s)

Reason for Occurrence(s)

Direct 12S7 1st Quarter 2023 CR 2023-07549 Radiation Environmental dosimeters were missing at REMP 04/22/23: Searched immediate area for missing o

location 12S7 during the 1st quarter exchange.

dosimeters. New dosimeter receptacle was Telephone pole dosimeters were attached to secured to pole, and 2nd quarter dosimeters II)

T""

appeared to have been struck by a vehicle.

were installed.

Direct 9D4 4th Quarter 2023 CR 2024-02103 Radiation One of the two required environmental dosimeters The analytical vendor confirmed that they could at REMP location 9D4 were not analyzed for the not locate the dosimeter at their processing o

4th quarter of 2023, as it was possibly lost in facility and their receiving department did not

.s::::

transit or at the analytical vendor's facility. Both have a record of receipt of the missing

-.::t' dosimeters for location 9D4 were placed, dosimeter. CR for tracking and trending of retrieved, and shipped to the analytical vendor by occurrence.

SSES personnel.

D.

Quality Assurance Program Teledyne Brown Engineering The quality of the results obtained by TBE is ensured by the implementation of the Quality Assurance Program as described in the Teledyne Brown Engineering Quality Assurance Manual and the Teledyne Brown Engineering Procedure Manual.

E.

Summary of Results - Inter-Laboratory Comparison Program The TBE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation, and water matrices for various analytes. The PE samples supplied by Analytics Inc.,

Environmental Resource Associates (ERA) and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP),

were evaluated against the following pre-set acceptance criteria:

1. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of TBEs result and Analytics known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

2. ERA Evaluation Criteria ERAs evaluation report provides an acceptance range for control and warning limits with associated flag values. ERAs acceptance limits are established per the USEPA, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (PT) program requirements or ERAs SOP for the Generation of Performance Acceptance Limits, as applicable.

The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3. DOE Evaluation Criteria MAPEPs evaluation report provides an acceptance range with associated flag values. MAPEP defines three levels of performance:

Acceptable (flag = A) - result within +/- 20% of the reference value Acceptable with Warning (flag = W) - result falls in the

+/- 20% to +/- 30% of the reference value Not Acceptable (flag = N) - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

Teledyne Brown Engineering For the TBE laboratory, 124 out of 131 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:

1.

The MAPEP February 2023 Soil Ni-63 result was evaluated as Not Acceptable. TBEs reported value was 294 Bq/kg and the known result was 1130 Bq/kg (range 791 - 1469). The sample was reprepped by a different (senior) lab technician with results of 1120 & 1250 Bq. It was determined that there was a difference between the two techs during the sample prep (technique) and the procedure was revised to reflect these differences including using a specific aliquot amount. (NCR 23-08) 2.

The MAPEP February 2023 vegetation Sr-90 result was evaluated as Not Acceptable. The reported value was 0.05 Bq (not detected) and the known result was a false positive. This was considered to be a statistical failure because TBEs reported result with 3 times the uncertainty resulted in a slightly positive net result (0.03194 Bq/kg). The reported result was significantly below TBEs average detection limit for vegetation samples. (NCR 23-09) 3.

The ERA RAD February 2023 water Ba-133 result was evaluated as Not Acceptable. The reported value was 26.0 pCi/L and the known was 22.3 (acceptance range 17.1 - 25.8 pCi) or 117% of the known (acceptable for TBE QC). The sample was used as the workgroup duplicate with a result of 25.4 (114%). The sample had also been counted on a different detector with a result of 21.9 (98%). The was TBEs first failure for Ba-133. (NCR 23-10) 4.

The MAPEP August 2023 soil Fe-55 result was evaluated as Not Acceptable. The reported value was 346 Bq/kg and the known result was 1280 (acceptance range of 896-1664 Bq/kg).

This was TBEs initial evaluation for Fe-55 in soils. The result was received at the end of December and the root cause in under investigation. No client samples were associated with this cross-check. (CAR 23-31) 5.

The Analytics September 2023 milk Sr-90 result was evaluated as Not Acceptable. The reported result was 7.28 pCi/L and the known result was 12.8 (57% of known). This sample was used as the workgroup duplicate and the carrier yields for both samples were 107% and 75%. The LCS recovery for the workgroup was at 106%. The ERA drinking water Sr-90 cross check that was analyzed around the same time was acceptable at 108%. There was no explanation for the failure. This is the first low biased failure for Sr-90 milk. The last failure (high) was in 2016. (NCR 23-24) 6.

The ERA RAD October 2023 water Gross Alpha result was evaluated as Not Acceptable. The reported result was 53.2 pCi/L and the known result was 70.6 (acceptable range of 54.0

- 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75% of the known value (within TBE QC range).

The original result was 63.3 pCi/L (90% of the known).

Because the LCS result was biased slightly high, the decision was made to report the lower value. (NCR 23-20) 7.

The ERA RAD October 2023 water I-131 result was evaluated as Not Acceptable. The reported value was 23.5 pCi/L and the known result was 29.7 (acceptable range of 25.8 - 33.6) The reported result was 79% of the known, which is within the acceptable TBE QC range. The workgroup was reviewed with no anomalies found. The LCS/LCSD results were 109% and 86.1%. The sample was not processed in a timely manner as per the ERA instructions which stated to analyze shortly after receipt due to the short half-life. Going forward, the QA &/or Lab Mgr. will ensure that this analysis is started sooner. (NCR 23-21)

The Inter-Laboratory Comparison Program provides evidence of in control counting systems and methods, and that the laboratories are producing accurate and reliable data.

IV.

Results and Discussion The analytical results of the 2023 REMP samples are divided into categories based on exposure pathways: atmospheric, direct radiation, terrestrial, and aquatic. The analytical results for the 2023 REMP are summarized in Appendix A, Program Summary. The data for individual samples are presented in Appendix C, Data Tables. The data are compared to the formal preoperational environmental monitoring program data (April 1972 to September 1982) and to data during operations. The data collected demonstrates that the SSES REMP was conducted in compliance with the TRM and the SSES ODCM.

A.

Atmospheric Atmospheric REMP sampling included the collection of air particulates, air iodine and direct radiation samples.

1.

Air Particulates Air particulate samples were collected weekly at six indicator locations (3S2, 9B1, 10S3, 12E1, 12S1 and 13S6) and one control locations (8G1). Each of the samples collected for the year were analyzed for gross beta. Quarterly composites of the weekly samples from each location were analyzed for specific gamma emitters.

Gross Beta Gross beta activity was detected in 318 of 318 of the indicator location samples at concentrations ranging from 6 to 27 E-3 pCi/m3 with an average concentration of 15 E-3 pCi/m3, and in 53 of 53 of the control location samples at concentrations ranging from 5 to 23 E-3 pCi/m3 with an average of 13 E-3 pCi/m3. The maximum preoperational level detected was 102 E-3 pCi/m3 with an average concentration of 62 E-3 pCi/m3.

(Table C-1, Appendix C); Historical levels of gross beta are shown in Figure C-1. Results for gross beta analysis from 1974 to current year are plotted.

Gamma Spectrometry Gamma spectrometry was performed on each of the 28 quarterly composite samples. Beryllium-7, attributed to cosmic ray activity in the atmosphere, was detected in all 24 indicator location composites at concentrations ranging from 56 E-3 to 126 E-3 pCi/m3 with an average concentration of 89 E-3 pCi/m3, and in the four control location composites ranging in concentration from 63 to 102 E-3 pCi/m3 with an average concentration of 82 E-3 pCi/m3.

The maximum preoperational level detected was 85 E-3 pCi/m3 with an average concentration of 74 E-3 pCi/m3. (Table C-2, Appendix C)

All other gamma emitters were less than the LLD.

2.

Air Iodine Filtered air iodine samples were collected weekly at six indicator locations (3S2, 9B1, 10S3, 12E1, 12S1, and 13S6) and one control locations (8G1). Each of the samples collected for the year were analyzed for I-131.

Iodine-131 Iodine-131 was not detected in any indicator location samples or control location samples. Preoperational data is not available for comparison. (Table C-3, Appendix C)

B.

Direct Radiation Ambient radiation levels in the environs were measured at each monitoring location with a pair of optically stimulated luminescent dosimeters (OSLD) composed of aluminum oxide crystals supplied and processed by Landauer. The Landauer OSLD is designed to meet the ANSI N545 Standard and ANSI/HPS Standard N13.37-2014.

Packets containing OSLDs for quarterly exposure were placed in the owner-controlled area and around the site at various distances and in each land-based meteorological sector. Emphasis was placed on special interest areas such as population centers, nearby residences, and schools.

A total of 59 locations were monitored for direct radiation during 2023, including 34 site boundary locations, 14 outer distant locations, six special interest locations and five control locations.

Environmental monitoring of ambient radiation levels began prior to the commencement of SSES operation. The preoperational monitoring period data used in the calculation of dose attributable the SSES operation is from 1980-1981. The availability of preoperational direct radiation monitoring data and data for control direct radiation monitoring locations provides a basis for distinguishing between the portions of dose received from exposure to sources of natural radiation and that which might have been from man-made sources of radiation.

Pre-operational and operational data are compared for the purpose of determining if dosimeter data may indicate a dose contribution from SSES operation. Ratios of doses for specific indicator locations to the average of the doses for control locations from operational periods are compared to their counterparts from the preoperational period.

Comparison of these ratios is performed in lieu of comparing the actual operational and preoperational doses. All indicator-to-control-average dose ratios for operational periods are compared to expected ranges from 1980-81 data for indicator-to-control-average dose ratios from the same locations. If preoperational data does not exist for the location of interest, indicator-to-control-average dose ratios for operational periods are compared to data for control locations monitored during 1980-81. The purpose for these comparisons is to flag possible SSES direct radiation dose contributions and to provide input, if appropriate, for the calculation of SSES direct radiation dose contributions.

Additional details on the statistical method used for determination of direct radiation dose to a member of the public due to SSES operation (based on environmental dosimeter data) can be found in Engineering Calculation EC-ENVR-1012, Interpretation of Environmental Direct Radiation Monitoring Results - Estimation of Direct Radiation Dose to Members of the Public Attributable to SSES Fuel Cycle Operations Rev. 2 [Reference 8].

The indicator locations annual average dose rate was 16.5 milliroentgen per standard quarter. The annual average dose rate for the control locations was 14.4 milliroentgen per standard quarter. The preoperational average for the quarterly direct radiation readings was 17.6 milliroentgen per standard quarter.

In 2023, the maximum direct radiation dose to a member of the public calculated using the methodology in EC-ENVR-1012 [Reference 8]

was 0.763 mrem.

The results of the direct radiation measurements for 2023 confirmed that the radiation levels in the vicinity of the SSES were similar to previous years. (Table C-4, Appendix C); Figure C Ambient Radiation Levels Based on Environmental Dosimetry Data from 1973 to current year are plotted as quarterly averages.

C.

Terrestrial Terrestrial REMP sampling included the collection of milk, groundwater, drinking water, and food products.

1.

Milk Milk samples were collected biweekly when cows were on pasture and monthly when cows were not grazing on pasture.

Animals are considered on pasture from April to October of each year. Samples were collected in new polyethylene containers and transported in ice chests with preservatives added to the milk.

Milk samples were collected at local dairy farms from 2 indicator locations (5E2 and 13E3) and one control location (10G1). Each sample was analyzed for I-131 and gamma emitters.

Iodine-131 Iodine-131 was not detected above minimum detectable concentration in any of the 60 samples analyzed.

Preoperational data is not available for comparison. (Table C-5, Appendix C); Figure C Iodine-131 Activity in Milk results from 1976 to 2023 are plotted.

Gamma Spectrometry Naturally occurring K-40 was detected in all 60 samples with concentrations for the 40 indicator location samples ranging from 1,056 to 1,595 pCi/L with an average concentration of 1,257 pCi/L, and the 20 control location sample concentrations ranging from 1,028 to 2,009 pCi/L with an average concentration of 1,302 pCi/L. The maximum preoperational level detected was 1,500 pCi/L with an average concentration of 1,358 pCi/L. (Table C-5, Appendix C).

All other gamma emitters were less than the LLD.

2. Groundwater An expanded groundwater monitoring network was initiated in 2006 for the SSES as part of a site-wide hydrogeological investigation in accordance with the Nuclear Energy Institute (NEI) Groundwater Protection Initiative (GPI). The additional groundwater monitoring wells are sampled as part of the Radiological Environmental Monitoring Program (REMP) to regularly assess groundwater quality and provide early detection of any inadvertent leaks or spills of radioactive materials that could reach groundwater. Groundwater is sampled quarterly and analyzed for H-3 and gamma activity.

Additionally, precipitation sampling was initiated in 2007 and analyzed for H-3 activity to assess the influence of station airborne H-3 emissions on groundwater H-3 activities.

Precipitation washout monitoring data is not used in dose calculations; however, the data does give a gross indication of H-3 which makes its way into surface water and soil where it eventually seeps into shallow groundwater. The annual average H-3 concentrations in precipitation, groundwater monitoring wells and surface water are summarized in Table C-7 and graphically depicted in Figure C Annual Average Tritium Activity (pCi/L) in Precipitation and Surface Water Versus Groundwater.

Groundwater samples were collected quarterly at 10 indicator locations (1S3, 1S4, 4S8, 4S9, 8S4, 7S10, 2S8, 6S11A, 6S12 and 7S11) and one control station (13S7). Each sample was analyzed for H-3 and gamma emitters.

Tritium Tritium activity was not detected above the minimum detectable concentration in any of the indicator or control samples. The maximum preoperational level detected was 119 pCi/L. (Table C-6, Appendix C); Figure C Annual Average Tritium Activity (pCi/L) in Precipitation and Surface Water Versus Groundwater results from 2007 to 2023 are plotted.

Gamma Spectrometry Naturally occurring K-40 was detected in one of the control samples with a concentration of 96 pCi/L. The Preoperational data is not available for comparison. (Table C-6, Appendix C)

All other gamma emitters were less than the LLD.

3.

Drinking Water Drinking water samples were collected monthly from one location (12H2). Each sample was analyzed for gross beta, H-3 and gamma emitters. Drinking Water control samples have not been obtained/analyzed because there are no upstream locations available in reasonable proximity to SSES. As an alternative to an upstream control location, Surface Water pathway control samples are obtained from the Susquehanna River via an auto-composite sampler at the SSES Intake Structure. Surface Water control samples serve as control samples for the Drinking Water pathway since the Surface Water control samples are from the Susquehanna River.

Gross Beta Gross beta activity was detected in two of the 12 drinking water samples. Sample concentrations ranged from 2.7 to 3.0 pCi/L with an average concentration of 2.8 pCi/L. The maximum preoperational level detected was 2.8 pCi/L with an average concentration of 1.8 pCi/L. (Table C-8, Appendix C); Figure C Gross Beta Activity in Drinking Water results from 1977 to 2023 are plotted.

Tritium Tritium activity was not detected in any of the samples. The maximum preoperational level detected was 194 pCi/L with an average of 132 pCi/L. (Table C-8, Appendix C)

Gamma Spectrometry Naturally occurring K-40 was not detected in any of the samples. Preoperational data is not available for comparison.

(Table C-8, Appendix C)

All other gamma emitters were less than the LLD.

4. Food Products Food products from three indicator locations (11D1, 11S6, and 12F7) were collected throughout the growing season. All samples (fruit, vegetable, and broadleaf) were analyzed for gamma emitters and included soybeans, corn, Swiss chard, pumpkin, potatoes, string beans, and collards.

Gamma Spectrometry Naturally occurring Be-7, attributed to cosmic ray activity in the atmosphere, was detected in five of the 17 indicator location samples with concentrations ranging from 497 to 1,037 pCi/kg wet with an average concentration of 692 pCi/kg wet.

Preoperational data is not available for comparison.

Naturally occurring K-40 was detected in all 17 indicator location samples with concentrations ranging from 1,764 to 17,550 pCi/kg wet with an average concentration of 4,332 pCi/kg wet. The maximum preoperational level detected was 4,800 pCi/kg wet with an average concentration of 2,140 pCi/kg wet.

Naturally occurring Ac-228 was not detected in any of the indicator or control locations. Preoperational data is not available for comparison.

Naturally occurring Th-228 was not detected in any of the indicator or control locations. Preoperational data is not available for comparison. (Table C-9, Appendix C)

All other gamma emitters were less than the LLD.

D.

Aquatic Aquatic samples include surface water, fish, and sediment samples.

1.

Surface Water Surface water samples were collected routinely at three indicator locations (6S5, 4S7, and LTAW) and two control locations (6S6 and 5S9). Each sample was analyzed for H-3 and gamma emitters.

Tritium Tritium activity was detected in none of the 18 indicator location samples. Tritium was not detected in any of the 15 control location samples. The maximum preoperational level detected was 319 pCi/L, with an average concentration of 140 pCi/L.

(Table C-10, Appendix C) Figure C Tritium Activity in Surface Water, results from 1972 to 2023 are plotted.

Gamma Spectrometry Naturally occurring K-40 was not detected in any of the indicator location samples. Two control locator samples had K-40 detected with an average concentration 24.6 pCi/L and ranging from of 24.1 to 25.2 pCi/L. Preoperational data is not available for comparison. Iodine-131 was not detected in any of the indicator or control samples. Naturally occurring Th-228 was detected in one of 21 indicator samples with a concentration of 4.8 pCi/L. The maximum preoperational level detected was 0.43 pCi/L, with an average concentration of 0.33 pCi/L. (Table C-10, Appendix C)

All other gamma emitters were less than the LLD.

2.

Fish Edible species of fish were collected in the spring and fall of 2023 at two indicator locations (IND [Susquehanna River] and LTAW (only collected in the fall)) and one control location (2H

[Susquehanna River]). Each sample was analyzed for gamma emitters.

Gamma Spectrometry Naturally occurring K-40 was detected in all indicator location samples at concentrations ranging from 2,358 to 4,937 pCi/kg wet with an average concentration of 3,729 pCi/kg wet, and in all control location samples at concentrations ranging from 2,466 to 3,629 pCi/kg wet with an average concentration of 3,156 pCi/kg wet. The maximum preoperational level detected was 3,600 pCi/kg dry with an average concentration of 3,871 pCi/kg dry. (Table C-11, Appendix C)

All other gamma emitters were less than the LLD.

3.

Shoreline Sediment Sediment samples were collected from the Susquehanna River in the spring and fall at two indicator locations (7B and 12F) and one control location (2B). Each sample was analyzed for gamma emitters.

Gamma Spectroscopy Naturally occurring K-40 was detected in all four of the indicator location samples at concentrations ranging from 8,672 to 14,420 pCi/kg dry with an average concentration of 11,370 pCi/kg dry, and in all of the control location samples with concentrations ranging from 15,470 to 17,170 pCi/kg dry with an average concentration of 16,320 pCi/kg dry. The maximum preoperational level detected was 11,000 pCi/kg dry with an average concentration of 8,500 pCi/kg dry.

Cesium-137 was not detected in any of the indicator or control location samples. The maximum preoperational level detected was 210 pCi/kg dry with an average concentration of 110 pCi/kg dry.

Naturally occurring Ra-226 was detected in one of the control location samples with a concentration of 2,678 pCi/kg dry and none of the indicator location samples. The maximum preoperational level detected was 1,900 pCi/kg dry with an average concentration of 700 pCi/kg dry.

Naturally occurring Ac-228 was detected in all four indicator location samples at concentrations ranging from 1,029 to 1,525 pCi/kg dry with an average concentration of 1,273 pCi/kg dry, and in both of the control location samples at concentrations ranging from 1,045 to 1,986 pCi/kg dry with an average concentration of 1,516 pCi/kg dry. Preoperational data is not available for comparison.

Naturally occurring Th-228 was detected in all of the four indicator location samples at concentrations ranging from 832 to 1,616 pCi/kg dry with an average concentration of 1,053 pCi/kg dry, and in both of the control location samples at concentrations ranging from 1,254 and 1,562 pCi/kg dry with an average concentration of 1,408 pCi/kg dry. The maximum preoperational level detected was 3,200 pCi/kg dry with an average concentration of 1,300 pCi/kg dry. (Table C 12, Appendix C)

All other gamma emitters were less than the LLD.

E.

Land Use Census SYNOPSIS OF 2023 LAND USE CENSUS Applied Ecoscience, Inc. conducted a Land Use Census during the 2023 growing season around SSES to comply with the ODCM. The purpose of the survey was to document the nearest milk animal, residence and garden greater than 50 m2 (approximately 500 ft2) producing broad leaf vegetation within a distance of 8 km (approximately 5 miles) in each of the 16 meteorological sectors surrounding the SSES.

Distance in Miles from the SUSQUEHANNA NUCLEAR Reactor Buildings Meteorological Sector Nearest Residence July-Sept, 2023 miles Nearest Garden June-Oct, 2023 miles Nearest Dairy Farm July-Nov, 2023 miles 1

N 1.3 4.0

>5.0 2

NNE 1.0 2.3 a,c,e

>5.0 3

NE 0.9 2.7

>5.0 4

ENE 2.1 2.4 a,c

>5.0 5

E 1.6 4.9 4.5 d 6

ESE 0.5 3.1

>5.0 7

SE 0.6 0.6

>5.0 8

SSE 0.7 2.9

>5.0 9

S 1.1 3.5

>5.0 10 SSW 0.9 1.3 a,c

>5.0 d 11 SW 1.5 4.2

>5.0 12 WSW 1.3 1.3 1.7 13 W

1.4 3.2 5.0 14 WNW 1.1 3.6

>5.0 15 NW 0.8 2.3

>5.0 16 NNW 0.7 4.0

>5.0 a Chickens raised for consumption at this location b Ducks raised for consumption at this location c Eggs consumed from chickens at this location d Fruits/vegetables raised for consumption at this location e Beef cattle raised for consumption at this location f Rabbits raised for consumption at this location.

The 2023 Land Use Census results are summarized in the above table.

V.

Annotations to Previous AREOR In the 2015 Radiological Environmental Operating Report on Table C-4, the quarterly average values for direct radiation Indicator and Control locations were incorrect. The values in the above referenced report were incorrectly reported as the same values listed for direct radiation Indicator and Control locations from the 2014 Radiological Environmental Operating Report.

Below are the updated 2015 quarterly average values for direct radiation Indicator and Control locations.

2015 Table C-4 Updated Quarterly Averages Location Indicator First Quarter Second Quarter Third Quarter Fourth Quarter Average 19.7 +/- 9.9 19.8 +/-

9.2 18.2 +/- 10.2 23.3 +/- 7.9 Control Average 18.1 +/- 3.2 17.1 +/-

2.7 15.3 +/- 2.7 13.9 +/- 2.0 VI.

Conclusions The Radiological Environmental Monitoring Program for SSES was conducted during 2023 in accordance with the SSES TRM and ODCM. The LLD values required by the TRM and ODCM were achieved for this reporting period (See Appendix A and Appendix C). The objectives of the program were also met during this period. The data collected assists in demonstrating that SSES was operated in compliance with TRM and ODCM requirements.

The concentration of radioactive material in the environment that could be attributable to SSES operations was only a small fraction of the concentration of naturally occurring and man-made radioactivity. Since these results were comparable to the results obtained during the preoperational phase of the program, which ran from 1972 to 1982, and with results collected since commercial operation, it is concluded that operation of the SSES had no significant radiological impact on the health and safety of the public or the environment.

From the results obtained, it can be concluded that the levels and fluctuations of radioactivity in environmental samples were as expected for the environment surrounding the SSES.

VII.

References

[1]

Annual Radiological Environmental Operating Report, January 1 to December 31, 2023, prepared by Teledyne Brown Engineering, Knoxville TN.

[2]

Final Safety Analysis Report

[3]

Final Environmental Statement

[4]

Susquehanna Steam Electric Station, 2023 Land Use Census. Prepared for Susquehanna Nuclear, LLC, Berwick, PA. December 2023. Applied Ecoscience, Inc. Berwick, PA.

[5]

Susquehanna Nuclear, LLC. Radiological Environmental Monitoring Program, ODCM-QA-008, Rev. 21.

[6]

United States Nuclear Regulatory Commission. An Acceptable Radiological Environmental Monitoring Program. Radiological Assessment Branch Technical Position. November 1979, Revision 1. USNRC, Washington, DC.

[7]

NCRP Report No. 160, Ionizing Radiation Exposure of the Population of the United States, (2009).

[8]

Engineering Calculation EC-ENVR-1012, Interpretation of Environmental Direct Radiation Monitoring Results - Estimation of Direct Radiation Dose to Members of the Public Attributable to SSES Fuel Cycle Operations, Rev. 2.

May 2013

[9]

Regulatory Guide 1.109, Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Evaluating Compliance with 10 CFR Part 50, Appendix I, Rev. 1 October 1977 APPENDIX A PROGRAM

SUMMARY

A-1

ANALYSIS AND MEDIUM OR PATHWAY TOTAL NUMBER SAMPLED OF ANALYSIS (UNIT OF MEASUREMENT) PERFORMED (1)

Air Particulates GR-B 371 (E-3 pCi/m3)

GAMMA 28 BE-7 28 K-40 28 CS-134 28 CS-137 28 Charcoal GAMMA 371 (E-3 pCi/m 3) 1-131 371 Ambient Radiation OSLO 235 (mR/std. qtr.)

Milk 1-131 60 (pCi/Liter)

GAMMA 60 K-40 60 CS-134 60 TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 LOWER LIMIT OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN DETECTION MEAN (3)

NAME MEAN (3)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE 10 1.482E+01 (318/318) 10S3 1.566E+01 (5.520E+00 - 2.670E+01) 0.6 MILES SSW (6.360E+00 - 2.350E+01)

N/A 8.890E+01 (24/24) 13S6 9.466E+01 (5.621 E+01 - 1.258E+02) 0.4 MILES W (7.892E+01 - 1.102E+02)

N/A

<MDC (0/24)

<MDC 50

<MDC (0/24)

<MDC 60

<MDC (0/24)

<MDC 70

<MDC (0/318)

<MDC N/A 1.648E+01 (215/215) 9S2 3.843E+01 (8.790E+00 - 3.999E+01) 0.2 MILES S (3.646E+01 - 3.999E+01)

<MDC (0/40)

<MDC N/A 1.257E+03 (40/40) 10G1 C 1.302E+03 (1.056E+03 - 1.595E+03) 14 MILES SSW (1.02BE+03 - 2.009E+03) 15

<MDC (0/40)

<MDC A-2 NUMBER OF CONTROL LOCATION NONROUTINE MEAN (3)

REPORTED RANGE MEASURMENTS (4)

(53/53) 1.348E+01 (53/53) 0 (4.840E+00 - 2.330E+01)

(4/4) 8.185E+01 (4/4) 0 (6.321E+01 - 1.017E+02)

<MDC (0/4) 0

<MDC (0/53) 0 (4/4) 1.438E+01 (20/20) 0 (1.092E+01 - 1.914E+01)

<MDC (0/20) 0 (20/20) 1.302E+03 (20/20) 0 (1.028E+03 - 2.009E+03)

<MDC (0/20) 0

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 ANALYSIS AND LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY TOTAL NUMBER OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSIS DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT) PERFORMED (1)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Milk (cont'd)

CS-137 60 18

<MDC (0/40)

<MDC

<MDC (0/20) 0 (pCi/Liter)

BA-140 60 60

<MDC (0/40)

<MDC

<MDC (0/20) 0 LA-140 60 15

<MDC (0/40)

<MDC

<MDC (0/20) 0 TH-228 60 N/A

<MDC (0/40)

<MDC

<MDC (0/20) 0 Ground Water H-3 44 2000

<MDC (0/40)

<MDC

<MDC (0/4) 0 (pCi/Liter)

GAMMA 44 K-40 44 N/A

<MDC (0/40) 13S7 C 9.605E+01 (1/4) 9.605E+01 (1/4) 0 0.2 MILES W (9.605E+01)

(9.605E+01)

MN-54 44 15

<MDC (0/40)

<MDC

<MDC (0/4) 0 CO-58 44 15

<MDC (0/40)

<MDC

<MDC (0/4) 0 FE-59 44 30

<MDC (0/40)

<MDC

<MDC (0/4) 0 CO-60 44 15

<MDC (0/40)

<MDC

<MDC (0/4) 0 A-3

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 ANALYSIS AND LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY TOTAL NUMBER OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSIS DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT) PERFORMED (1)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Ground Water (cont'd)

ZN-65 44 30

<MDC (0140)

<MDC

<MDC (014) 0 (pCilliter)

NB-95 44 15

<MDC (0/40)

<MDC

<MDC (014) 0 ZR-95 44 30

<MDC (0140)

<MDC

<MDC (014) 0 1-131 44 15

<MDC (0140)

<MDC

<MDC (014) 0 CS-134 44 15

<MDC (0/40)

<MDC

<MDC (014) 0 CS-137 44 18

<MDC (0/40)

<MDC

<MDC (014) 0 BA-140 44 60

<MDC (0140)

<MDC

<MDC (014) 0 LA-140 44 15

<MDC (0/40)

<MDC

<MDC (014) 0 TH-228 44 NIA

<MDC (0140)

<MDC

<MDC (014) 0 Drinking Water GR-B 12 4

2.815E+OO (2112) 12H2 2.815E+OO (2112)

NIA 0

(pCilliter)

(2.670E+OO - 2.960E+OO) 26 MILES WSW (2.670E+OO - 2.960E+OO)

H-3 12 2000

<MDC (0112)

<MDC NIA 0

A-4

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 ANALYSIS AND LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY TOTAL NUMBER OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSIS DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT) PERFORMED (1)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Drinking Water (cont'd)

GAMMA 12 (pCilliter)

K-40 12 NIA

<MDC (0112)

<MDC NIA 0

MN-54 12 15

<MDC (0112)

<MDC NIA 0

CO-58 12 15

<MDC (0112)

<MDC NIA 0

FE-59 12 30

<MDC (0112)

<MDC NIA 0

CO-60 12 15

<MDC (0112)

<MDC NIA 0

ZN-65 12 30

<MDC (0112)

<MDC NIA 0

NB-95 12 15

<MDC (0112)

<MDC NIA 0

ZR-95 12 30

<MDC (0112)

<MDC NIA 0

1-131 12 15

<MDC (0112)

<MDC NIA 0

CS-134 12 15

<MDC (0112)

<MDC NIA 0

A-5

ANALYSIS AND MEDIUM OR PATHWAY TOTAL NUMBER SAMPLED OF ANALYSIS (UNIT OF MEASUREMENT) PERFORMED (1)

Drinking Water (cont'd)

CS-137 12 (pCi/Liter)

BA-140 12 LA-140 12 Food/Garden Crops GAMMA 17 (pCi/kg wet)

BE-7 17 K-40 17 MN-54 17 CO-58 17 FE-59 17 CO-60 17 ZN-65 17 TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 LOWER LIMIT OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN DETECTION MEAN (3)

NAME MEAN (3)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE 18

<MDC (0/12)

<MDC 60

<MDC (0/12)

<MDC 15

<MDC (0/12)

<MDC N/A 6.924E+02 (5/17) 11S6 6.924E+02 (4.970E+02 - 1.037E+03) 0.5 MILES SW (4.970E+02 - 1.037E+03)

NIA 4.332E+03 (17/17) 12F7 6.244E+03 (1.764E+03 - 1.755E+04) 8.3 MILES WSW (1.854E+03 - 1.755E+04)

N/A

<MDC (0/17)

<MDC NIA

<MDC (0/17)

<MDC N/A

<MDC (0/17)

<MDC N/A

<MDC (0/17)

<MDC N/A

<MDC (0/17)

<MDC A-6 NUMBER OF CONTROL LOCATION NONROUTINE MEAN (3)

REPORTED RANGE MEASURMENTS (4)

NIA 0

N/A 0

(5/10)

NIA 0

(4/4)

NIA 0

N/A 0

NIA 0

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 ANALYSIS AND LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY TOTAL NUMBER OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSIS DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT) PERFORMED (1)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Food/Garden Crops (cont'd) NB-95 17 N/A

<MDC (0/17)

<MDC N/A 0

(pCi/kg wet)

ZR-95 17 N/A

<MDC (0/17)

<MDC N/A 0

1-131 17 60

<MDC (0/17)

<MDC N/A 0

CS-134 17 60

<MDC (0/17)

<MDC N/A 0

CS-137 17 80

<MDC (0/17)

<MDC NIA 0

BA-140 17 N/A

<MDC (0/17)

<MDC N/A 0

LA-140 17 N/A

<MDC (0/17)

<MDC N/A 0

AC-228 17 N/A

<MDC (0/17)

<MDC N/A 0

TH-228 17 N/A

<MDC (0/17)

<MDC N/A 0

A-7

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 ANALYSIS AND LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY TOTAL NUMBER OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSIS DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMEND PERFORMED (1)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Surface Water H-3 33 2000

<MDC (0/18)

<MDC

<MDC (0/15) 0 (pCi/Liter)

GAMMA 33 K-40 33 N/A

<MDC (0/18) 6S6 C 2.46E+01 (2/12) 2.46E+01 (2/15) 0 0.8 MILES ESE (2.408E+01 - 2.519E+01)

(2.408E+01 - 2.519E+01)

MN-54 33 15

<MDC (0/18)

<MDC

<MDC (0/15) 0 CO-58 33 15

<MDC (0/18)

<MDC

<MDC (0/15) 0 FE-59 33 30

<MDC (0/18)

<MDC

<MDC (0/15) 0 CO-60 33 15

<MDC (0/18)

<MDC

<MDC (0/15) 0 ZN-65 33 30

<MDC (0/18)

<MDC

<MDC (0/15) 0 NB-95 33 15

<MDC (0/18)

<MDC

<MDC (0/15)

D ZR-95 33 30

<MDC (0/18)

<MDC

<MDC (0/15) 0 1-131 33 15

<MDC (0/18)

<MDC

<MDC (0/15)

D A-8

ANALYSIS AND MEDIUM OR PATHWAY TOTAL NUMBER SAMPLED OF ANALYSIS (UNIT OF MEASUREMEND PERFORMED (1)

Surface Water (cont'd)

CS-134 33 (pCi/Liter)

CS-137 33 BA-140 33 LA-140 33 TH-228 33 Fish GAMMA 14 (pCi/kg wet)

K-40 14 MN-54 14 CO-58 14 FE-59 14 CO-60 14 TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 LOWER LIMIT OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN DETECTION MEAN (3)

NAME MEAN (3)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE 15

<MDC (0/18)

<MDC 18

<MDC (0/18)

<MDC 60

<MDC (0/18)

<MDC 15

<MDC (0/18)

<MDC NIA 4.808E+00 (1/18) 6S5 4.808E+00 (4.808E+00) 0.9 MILES ESE (4.808E+00)

N/A 3.729E+03 (8/8)

LTAW 4.447E+03 (2.358E+03 - 4.937E+03) 0.7 MILES NE-ESE (3.957E+03 - 4.937E+03) 130

<MDC (0/8)

<MDC 130

<MDC (0/8)

<MDC 260

<MDC (0/8)

<MDC 130

<MDC (0/8)

<MDC A-9 NUMBER OF CONTROL LOCATION NONROUTINE MEAN (3)

REPORTED RANGE MEASURMENTS (4)

<MDC (0/15) 0

<MDC (0/15) 0 (1/12)

<MDC (0/15) 0 (2/2) 3.156E+03 (6/6) 0 (2.466E+03 - 3.629E+03)

<MDC (0/6) 0

<MDC (0/6)

D

<MDC (0/6) 0

ANALYSIS AND MEDIUM OR PATHWAY TOTAL NUMBER SAMPLED OF ANALYSIS (UNIT OF MEASUREMENT) PERFORMED (1)

Fish (cont'd)

ZN-65 14 (pCi/kg wet)

CS-134 14 CS-137 14 Sediment GAMMA 6

(pCi/kg dry)

K-40 6

CS-134 6

CS-137 6

RA-226 6

AC-228 6

TH-228 6

TABLE A

SUMMARY

OF DATA FOR SSES OPERATIONAL RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM NAME OF FACILITY: SUSQUEHANNA STEAM ELECTRIC STATION LOCATION OF FACILITY: LUZERNE COUNTY, PENNSYLVANIA Reporting Period: December 28, 2022 to January 3, 2024 LOWER LIMIT OF ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN DETECTION MEAN (3)

NAME MEAN (3)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE 260

<MDC (0/8)

<MDC 130

<MDC (0/8)

<MDC 150

<MDC (0/8)

<MDC N/A 1.137E+04 (4/4) 2B 1.632E+04 (8.672E+03 - 1.442E+04) 1.6 MILES NNE (1.547E+04 - 1.717E+04) 150

<MDC (0/4)

<MDC 180

<MDC (0/4)

<MDC N/A

<MDC (0/4) 28 2.678E+03 1.6 MILES NNE (2.678E+03)

N/A 1.273E+03 (4/4) 2B 1.516E+03 (1.029E+03 - 1.525E+03) 1.6 MILES NNE (1.045E+03 - 1.986E+03)

N/A 1.053E+03 (4/4) 2B 1.408E+03 (8.320E+02 - 1.616E+03) 1.6 MILES NNE (1.254E+03 - 1.562E+03)

1. The total number of analyses does not include duplicates, splits or repeated analyses.

2. The Technical Requirement LLDs are shown when applicable.

CONTROL LOCATION MEAN (3)

RANGE

<MDC (0/6)

(2/2) 1.632E+04 (2/2)

(1.547E+04 - 1.717E+04)

<MDC (0/2)

(1/2) 2.678E+03 (1/2)

(2.678E+03)

(2/2) 1.516E+03 (2/2)

(1.045E+03 - 1.986E+03)

(2/2) 1.408E+03 (2/2)

(1.254E+03 - 1.562E+03)

3. The mean and range are based on all results above MDC. The ratio indicated in parentheses is the total number of results used to calculate the mean to the total number of samples.

4. USNRC Reporting Levels are specified in the Technical Requirements (i.e., when Reporting Levels in Technical Requirements are exceeded).

A-10 NUMBER OF NON ROUTINE REPORTED MEASURMENTS (4) 0 0

0 0

0

APPENDIX B SAMPLE DESIGNATION AND LOCATIONS B-1

SAMPLE DESIGNATION All distances from the SSES to monitoring locations are measured from the standby gas treatment vent at 44200/N34117 (Pa. Grid System). The location codes are based on both distance and direction from the SSES. The letters in the location codes indicate if the monitoring locations are on site (within the site boundary) or, if they are not on site, the approximate distances of the location from the SSES as described below:

S

= On site E

= 4 - 5 miles A

= < 1 mile F

= 5 - 10 miles B

= 1 - 2 miles G

= 10 - 20 miles C

= 2 - 3 miles H

= > 20 miles D

= 3 - 4 miles The numbers preceding the letters in the location codes provide the direction of the monitoring locations from the SSES by indicating the sectors in which they are located. A total number of 16 sectors (numbered one through 16) equally divide an imaginary circle on a map of the SSES and its vicinity, with the SSES at the center of the circle. The middle of sector one is directed due North (N). Moving clockwise from sector one, the sector immediately adjacent to sector one is sector two, the middle of which is directed due north, north east (NNE). Continuing to move clockwise the sector number increases to 16, which is the north northwest sector (NNW).

B-2

TABLE B-1 SAMPLING LOCATIONS Specific information about the individual sampling locations are given in Table B-1. Maps B-1 through B-6 show the locations of sampling stations with respect to the Site. A Portable Global Positioning System (GPS) was used to provide the coordinates of sampling locations.

STATION CODE STATION LOCATION LATITUDINAL LONGITUDINAL SAMPLE TYPE LESS THAN ONE MILE FROM THE SSES DEG.

DEG.

6S5 0.9 mi.ESE; 41.084639

-76.130642 Surface water 6S6 **

0.8 mi.ESE; 41.088115

-76.131637 Surface water 5S9**

0.8 mi. E 41.093292

-76.130472 Surface water LTAW 0.7 mi.NE-ESE; 41.098356

-76.135401 Fish. Surface water 4S7 0.4 mi. ENE 41.094418

-76.138236 Surface water 10S3 0.6 mi. SSW; 41.085264

-76.152128 Air 12S1 0.4 mi.WSW; 41.088436

-76.154314 Air 13S6 0.4 mi.W; 41.091771

-76.153869 Air 3S2 0.5 mi NE; 41.095716

-76.140207 Air 1S4 0.1 mi N; 41.093302

-76.145853 Ground water 2S8 0.1 mi.NNE; 41.094991

-76..044207 Ground water 6S11A 0.4 mi.ESE; 41.083448

-76.133412 Ground water 6S12 0.8 mi.ESE; 41.083411

-76.116935 Ground water 7S11 0.3 mi.SE; 41.083527

-76.133513 Ground water 1S3 0.1 mi N; 41.093640

-76.146076 Ground water 4S8 0.1 mi.ENE; 41.092306

-76.144283 Ground water 4S9 0.3 mi.E; 41.093369

-76.141644 Ground water 8S4 0.1 mi.SSE; 41.091424

-76.145531 Ground water 7S10 0.3 mi.SE; 41.089736

-76.142783 Ground water 13S7**

0.2 mi.W; 41.091236

-76.149647 Ground water 11S6 0.5 mi.SW; 41.085305

-76.152022 Broadleaf Site 1 0.1 mi.ESE; 41.092275

-76.145022 Precipitation Site 2 0.1 mi.SSE; 41.091309

-76.145708 Precipitation Site 3 0.1 mi.WSW; 41.091243

-76.147345 Precipitation Site 4 0.1 mi.NW; 41.093321

-76.147316 Precipitation

- Control Location B-3

TABLE B-1 (contd)

SAMPLING LOCATIONS STATION CODE STATION LOCATION LATITUDINAL LONGITUDINAL SAMPLE TYPE FROM ONE to FIVE MILES FROM THE SSES DEG.

DEG.

IND 0.9 mi.ESE; 41.085141

-76.130174 Fish IND 1.4 mi.ESE; 41.075618

-76.132682 Fish 2B **

1.6 mi.NNE; 41.112441

-76.134758 Sediment 7B 1.2 mi.SE; 41.078924

-76.131548 Sediment 9B1 1.3 mi. SSW; 41.085264

-76.152128 Air 12E1 4.7 mi.WSW; 41.072418

-76.230554 Air 5E2 4.5 mi.E; 41.085184

-76.061099 Milk 13E3 5.0 mi.W; 41.100259

-76.241102 Milk 11D1 3.3 mi.SW; 41.055212

-76.186797 Food Products

- Control Location GREATER THAN FIVE MILES FROM THE SSES 12H2 26 mi.WSW; 40.947192

-76.604524 Drinking water 2H **

30 mi.NNE; 41.459508

-75.853096 Fish 12F 6.9 mi.WSW; 41.041323

-76.255396 Sediment 12F7 8.3 mi.WSW 41.036689

-76.286776 Food Products 8G1 **

12 mi.SSE; 40.928886

-76.055092 Air 10G1 **

14 mi.SSW; 40.934847

-76.284449 Milk B-4

TABLE B-1 (contd)

SAMPLING LOCATIONS STATION CODE STATION LOCATION LATITUDINAL LONGITUDINAL SAMPLE TYPE OSLD LOCATIONS LESS THAN ONE MILE FROM THE SSES DEG.

DEG.

1S2 0.2 mi.N; 41.09566

-76.146121 OSLD 2S2 0.9 mi.NNE; 41.10207

-76.141192 OSLD 2S3 0.2 mi.NNE; 41.09486

-76.144101 OSLD 3S2 0.5 mi.NE; 41.09574

-76.140086 OSLD 3S3 0.9 mi.NE; 41.10183

-76.133127 OSLD 4S3 0.2 mi.ENE; 41.09322

-76.141934 OSLD 4S6 0.7 mi.ENE; 41.09687

-76.133807 OSLD 5S4 0.8 mi.E; 41.09286

-76.131604 OSLD 5S7 0.3 mi.E; 41.09199

-76.141165 OSLD 6S4 0.2 mi.ESE; 41.09132

-76.142616 OSLD 6S9 0.2 mi.ESE; 41.09067

-76.142966 OSLD 7S6 0.2 mi.SE; 41.08972

-76.14359 OSLD 7S7 0.4 mi.SE; 41.08745

-76.142033 OSLD 8S2 0.2 mi.SSE; 41.08907

-76.14437 OSLD 9S2 0.2 mi.S; 41.08952

-76.14322 OSLD 9S3 0.3 mi. S 41.087544

-76.145369 OSLD 9S4 0.4 mi. S 41.086672

-76.146280 OSLD 10S1 0.4 mi.SSW; 41.08663

-76.150082 OSLD 10S2 0.2 mi.SSW; 41.08894

-76.147881 OSLD 11S7 0.4 mi.SWN; 41.08832

-76.15297 OSLD 12S1 0.4 mi.WSW; 41.0887

-76.154112 OSLD 12S3 0.4 mi.WSW; 41.08968

-76.153192 OSLD 13S2 0.4 mi.W; 41.09198

-76.153166 OSLD 13S5 0.4 mi.W; 41.09179

-76.153167 OSLD 13S6 0.4 mi.W; 41.09177

-76.154073 OSLD 14S5 0.5 mi.WNW; 41.09503

-76.153787 OSLD 15S5 0.4 mi.NW; 41.09576

-76.15103 OSLD 16S1 0.3 mi.NNW; 41.09611

-76.147388 OSLD 16S2 0.3 mi.NNW; 41.09599

-76.148922 OSLD 6A4

0.6 mi.ESE; 41.08791

-76.136795 OSLD B-5

TABLE B-1 (contd)

SAMPLING LOCATIONS STATION CODE STATION LOCATION LATITUDINAL LONGITUDINAL SAMPLE TYPE LESS THAN ONE MILE FROM THE SSES DEG.

DEG.

8A3 0.9 mi.SSE; 41.07982

-76.1139078 OSLD 15A3

0.9 mi.NW; 41.10003

-76.1585 OSLD 16A2

0.8 mi.NNW; 41.1025

-76.151595 OSLD FROM ONE to FIVE MILES FROM THE SSES 12S7 1.1 mi.WSW; 41.08621

-76.165914 OSLD 8B2

1.4 mi.SSE; 41.07483

-76.130724 OSLD 9B1 1.3 mi.S; 41.07356

-76.147874 OSLD 10B3

1.7 mi.SSW; 41.07064

-76.156646 OSLD 1D5 4.0 mi.N; 41.14936

-76.144346 OSLD 8D3 4.0 mi.SSE; 41.03824

-76.121683 OSLD 9D4 3.6 mi.S; 41.04015

-76.144529 OSLD 10D1 3.0 mi.SSW; 41.05446

-76.175026 OSLD 12D2 3.7 mi.WSW; 41.07363

-76.213306 OSLD 14D1 3.6 mi.WNW; 41.10706

-76.211891 OSLD 3E1 4.7 mi NE; 41.13953

-76.082398 OSLD 4E2 4.7 mi.ENE; 41.12157

-76.064115 OSLD 5E2 4.5 mi. E; 41.08539

-76.060486 OSLD 6E1 4.7 mi.ESE; 41.07275

-76.059529 OSLD 7E1 4.2 mi.SE; 41.04891

-76.090309 OSLD 11E1 4.7 mi. SW; 41.05188

-76.218713 OSLD 12E1

4.7 mi.WSW; 41.0725

-76.230331 OSLD 13E4 4.1 mi.W; 41.08962

-76.223726 OSLD

Special Interest Area (other than controls)

B-6

TABLE B-1 (contd)

SAMPLING LOCATIONS STATION CODE STATION LOCATION LATITUDINAL LONGITUDINAL SAMPLE TYPE GREATER THAN FIVE MILES FROM THE SSES DEG.

DEG.

2F1 5.9 mi.NNE; 41.16796

-76.09146 OSLD 15F1 5.4 mi.NW; 41.15595

-76.202506 OSLD 16F1 7.8 mi.NNW; 41.18985

-76.229283 OSLD 3G4 **

17 mi.NE; 41.23431

-76.869061 OSLD 4G1 **

14 mi.ENE; 41.13898

-75.885121 OSLD 7G1 **

14 mi.SE; 40.94636

-76.974184 OSLD 12G1 **

15 mi.WSW; 41.0262

-76.411566 OSLD 12G4 **

10 mi. WSW; 40.03868

-76.327731 OSLD

Special Interest Area (other than controls)

- Control Location B-7

TABLE B-2 SUSQUEHANNA STEAM ELECTRIC STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM Sample Medium Analysis Sampling Method Collection Procedure Number Analytical Procedure Number Ambient Radiation Dosimeter Quarterly SSES, HP-TP-205 Landauer Procedure L313, Inlight Dosimeter Analysis Air Gross Beta Weekly Applied Ecoscience, Appendix 2 TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices.

Air I-131 Weekly Applied Ecoscience, Appendix 2 TBE-2012 Radioiodine in Various Matrices Air Gamma Quarterly Applied Ecoscience, Appendix 2 TBE-2007 Gamma Emitting Radioisotope Analysis Drinking Water Gross Beta Monthly Applied Ecoscience, Appendix 4 TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices.

Surface & Drinking Water Tritium Monthly / Quarterly (Grab)

Applied Ecoscience, Appendix 3, 4, 5, 13 TBE-2010 Tritium and Carbon-14 Analysis by Liquid Scintillation.

Surface & Drinking Water Gamma Monthly / Quarterly (Grab)

Applied Ecoscience, Appendix 3, 4, 5, 13 TBE-2007 Gamma Emitting Radioisotope Analysis.

Ground Water Tritium Quarterly Applied Ecoscience, Appendix 6 TBE-2010 Tritium and Carbon-14 Analysis by Liquid Scintillation Ground Water Gamma Quarterly Applied Ecoscience, Appendix 6 TBE-2007 Gamma Emitting Radioisotope Analysis B-8

TABLE B-2 (cont'd)

SUSQUEHANNA STEAM ELECTRIC STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM Sample Medium Analysis Sampling Method Collection Procedure Number Analytical Procedure Number Precipitation Tritium (Apr - Nov) / Quarterly Applied Ecoscience, Appendix 8 TBE-2010 Tritium and Carbon-14 Analysis by Liquid Scintillation Milk Gamma Monthly / Bi-Weekly Applied Ecoscience, Appendix 7 TBE-2007 Gamma Emitting Radioisotope Analysis Milk I-131 Monthly / Bi-Weekly Applied Ecoscience, Appendix 7 TBE-2012 Radioiodine in Various Matrices Fish Gamma Semi-Annually (Spring/Fall)

Applied Ecoscience, Appendix 9 TBE-2007 Gamma Emitting Radioisotope Analysis Sediment Gamma Semi-Annually (Spring/Fall)

Applied Ecoscience, Appendix 10 TBE-2007 Gamma Emitting Radioisotope Analysis Fruits &

Vegetables Gamma In Season (When available)

Applied Ecoscience, Appendix 11 Applied Ecoscience, Appendix 12 TBE-2007 Gamma Emitting Radioisotope Analysis B-9

MAP 8-1 Direct Radiation Monitoring Locations Within One Mile B-10

MAP 8-2 Direct Radiation Monitoring Locations From One to Five Miles 1

Mlff'rfVa!e p

B-11

MAP 8-3 Direct Radiation Monitoring Locations Greater Than Five Miles B-12

IVIAp B.. 4 Environmental Sampling Locations Within One /V/iie

'i>f,t~~il.*~

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MAP 8-5 Environmental Sampling Locations From One to Five Miles B-14

MAP 8-6 Environmental Sampling Locations Greater Than Five Miles

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APPENDIXC DATA TABLES C-1

TABLE C-1 GROSS BETA ANALYSES OF AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 3S2 8G1 12E1 12S1 13S6 981 12/28/22 - 01 /04/23 18 +/- 3 12 +/- 2 21 +/- 3 22 +/- 3 22 +/- 3 20 +/- 3 01/04/23 - 01/11/23 14 +/- 2 12 +/- 2 14 +/- 2 16 +/- 2 17 +/- 2 16 +/- 2 01/11/23 - 01/18/23 11 +/- 2 11 +/- 2 14 +/- 2 12 +/- 2 11 +/- 2 12 +/- 2 01/18/23 - 01/24/23 6 +/- 2 7 +/- 2 7 +/- 2 6 +/- 2 6 +/- 2 6 +/- 2 01/24/23 - 02/01/23 14 +/- 2 10 +/- 2 14 +/- 2 15 +/- 2 14 +/- 2 13 +/- 2 02/01 /23 - 02/08/23 12 +/- 2 13 +/- 2 17 +/- 2 20 +/- 6 16 +/- 2 15 +/- 2 02/08/23 - 02/15/23 17 +/- 2 16 +/- 2 16 +/- 2 17 +/- 2 19 +/- 2 16 +/- 2 02/15/23 - 02/22/23 13 +/- 2 15 +/- 2 16 +/- 2 17 +/- 2 16 +/- 2 14 +/- 2 02/22/23 - 02/28/23 11 +/- 2 12 +/- 2 15 +/- 2 13 +/- 2 13 +/- 2 12 +/- 2 02/28/23 - 03/08/23 9 +/- 2 8 +/- 2 11 +/- 2 9 +/- 2 9 +/- 2 9 +/- 2 03/08/23 - 03/15/23 8 +/- 2 7 +/- 2 8 +/- 2 8 +/- 2 9 +/- 2 9 +/- 2 03/15/23 - 03/22/23 16 +/- 2 15 +/- 2 17 +/- 2 17 +/- 2 17 +/- 2 18 +/- 2 03/22/23 - 03/29/23 15 +/- 2 13 +/- 2 15 +/- 2 15 +/- 2 16 +/- 2 13 +/- 2 03/29/23 - 04/05/23 18 +/- 2 16 +/- 2 16 +/- 2 15 +/- 2 20 +/- 3 19 +/- 2 04/05/23 - 04/12/23 16 +/- 2 17 +/- 2 21 +/- 3 19 +/- 3 19 +/- 3 19 +/- 3 04/12/23 - 04/19/23 14 +/- 2 11 +/- 2 15 +/- 2 14 +/- 2 15 +/- 2 13 +/- 2 04/19/23 - 04/26/23 12 +/- 2 9 +/- 2 14 +/- 2 12 +/- 2 11 +/- 2 13 +/- 2 04/26/23 - 05/03/23 6 +/- 2 5 +/- 2 6 +/- 2 8 +/- 2 8 +/- 2 8 +/- 2 05/03/23 - 05/10/23 7 +/- 2 8 +/- 2 10 +/- 2 8 +/- 2 7 +/- 2 8 +/- 2 05/10/23 - 05/17/23 13 +/- 2 14 +/- 2 16 +/- 2 14 +/- 2 14 +/- 2 15 +/- 2 05/17/23 - 05/24/23 11 +/- 2 13 +/- 2 13 +/- 2 12 +/- 2 13 +/- 2 14 +/- 2 05/24/23 - 05/30/23 10 +/- 2 9 +/- 2 9 +/- 2 11 +/- 2 12 +/- 2 12 +/- 2 05/30/23 - 06/06/23 13 +/- 2 11 +/- 2 17 +/- 2 14 +/- 2 16 +/- 2 15 +/- 2 06/06/23 - 06/12/23 18 +/- 5 16 +/- 4 25 +/- 6 19 +/- 5 22 +/- 5 27 +/- 6 06/12/23 - 06/20/23 10 +/- 2 10 +/- 2 12 +/- 2 11 +/- 2 11 +/- 2 12 +/- 2 06/20/23 - 06/28/23 7 +/- 2 9 +/- 2 9 +/- 2 9 +/- 2 9 +/- 2 8 +/- 2 06/28/23 - 07/05/23 16 +/- 2 18 +/- 2 20 +/- 2 18 +/- 2 20 +/- 2 16 +/- 2 07/05/23 - 07/11/23 14 +/- 2 15 +/- 2 17 +/- 2 16 +/- 3 18 +/- 3 16 +/- 2 07/11/23 - 07/18/23 17 +/- 2 20 +/- 3 19 +/- 3 17 +/- 2 20 +/- 3 18 +/- 2 07/18/23 - 07/26/23 14 +/- 2 16 +/- 2 15 +/- 2 14 +/- 2 16 +/- 2 16 +/- 2 07/26/23 - 08/02/23 14 +/- 2 16 +/- 2 15 +/- 2 16 +/- 2 18 +/- 3 14 +/- 2 08/02/23 - 08/09/23 14 +/- 2 15 +/- 2 16 +/- 2 13 +/- 2 14 +/- 2 14 +/- 2 08/09/23 - 08/16/23 15 +/- 2 16 +/- 2 18 +/- 2 18 +/- 2 16 +/- 2 15 +/- 2 08/16/23 - 08/23/23 13 +/- 2 14 +/- 2 14 +/- 2 15 +/- 2 15 +/- 2 13 +/- 2 08/23/23 - 08/30/23 12 +/- 2 13 +/- 2 13 +/- 2 14 +/- 2 13 +/- 2 13 +/- 2 08/30/23 - 09/06/23 20 +/- 3 20 +/- 3 22 +/- 3 17 +/- 2 22 +/- 3 20 +/- 2 09/06/23 - 09/12/23 20 +/- 3 18 +/- 3 19 +/- 3 21 +/- 3 22 +/- 3 21 +/- 3 09/12/23 - 09/20/23 13 +/- 2 14 +/- 2 14 +/- 2 13 +/- 2 16 +/- 2 15 +/- 2 09/20/23 - 09/27/23 11 +/- 2 9 +/- 2 11 +/- 2 11 +/- 2 12 +/- 2 12 +/- 2 09/27/23 - 10/03/23 15 +/- 3 15 +/- 3 14 +/- 2 12 +/- 2 14 +/- 3 15 +/- 3 10/03/23 - 10/11/23 19 +/- 2 17 +/- 2 18 +/- 2 17 +/- 2 18 +/- 2 18 +/- 2 10/11 /23 - 10/18/23 8 +/- 2 10 +/- 2 10 +/- 2 10 +/- 2 8 +/- 2 11 +/- 2 10/18/23 - 10/25/23 10 +/- 2 12 +/- 2 13 +/- 2 13 +/- 2 13 +/- 2 11 +/- 2 10/25/23 - 11/01/23 17 +/- 2 16 +/- 2 19 +/- 2 16 +/- 2 16 +/- 2 16 +/- 2 11/01/23 - 11/08/23 24 +/- 3 23 +/- 3 23 +/- 3 24 +/- 3 24 +/- 3 22 +/- 3 11/08/23 - 11 /15/23 14 +/- 2 15 +/- 2 15 +/- 2 15 +/- 2 16 +/- 2 16 +/- 2 11/15/23 - 11/21/23 16 +/- 3 16 +/- 3 18 +/- 3 19 +/- 3 19 +/- 3 23 +/- 3 11/21/23 - 11/29/23 13 +/- 2 13 +/- 2 13 +/- 2 12 +/- 2 13 +/- 2 12 +/- 2 11 /29/23 - 12/06/23 21 +/- 3 19 +/- 2 20 +/- 2 19 +/- 2 18 +/- 2 20 +/- 2 12/06/23 - 12/13/23 16 +/- 2 16 +/- 2 13 +/- 2 14 +/- 2 16 +/- 2 14 +/- 2 12/13/23 - 12/20/23 14 +/- 2 15 +/- 2 17 +/- 2 16 +/- 2 16 +/- 2 15 +/- 2 12/20/23 - 12/27/23 17 +/- 2 15 +/- 2 17 +/- 2 14 +/- 2 17 +/- 2 17 +/- 2 12/27/23 - 01/03/24 11 +/- 2 11 +/- 2 12 +/- 2 13 +/- 2 12 +/- 2 14 +/- 2 AVERAGE 14 +/- 8 13 +/- 7 15 +/- 8 14 +/- 7 15 +/- 8 15 +/- 8 C-2

TABLE C-1 COLLECTION PERIOD 12/28/22 - 01 /04/23 01/04/23 - 01/11/23 01/11/23 - 01/18/23 01/18/23 - 01 /24/23 01/24/23 - 02/01/23 02/01/23 - 02/08/23 02/08/23 - 02/15/23 02/15/23 - 02/22/23 02/22/23 - 02/28/23 02/28/23 - 03/08/23 03/08/23 - 03/15/23 03/ 15/23 - 03/22/23 03/22/23 - 03/29/23 03/29/23 - 04/05/23 04/05/23 - 04/12/23 04/ 12/23 - 04/19/23 04/19/23 - 04/26/23 04/26/23 - 05/03/23 05/03/23 - 05/10/23 05/10/23 - 05/17/23 05/17/23 - 05/24/23 05/24/23 - 05/30/23 05/30/23 - 06/06/23 06/06/23 - 06/12/23 06/12/23 - 06/20/23 06/20/23 - 06/28/23 06/28/23 - 07105/23 07/05/23 - 07/11/23 07/11/23 - 07/18/23 07/18/23 - 07/26/23 07 /26/23 - 08/02/23 08/02/23 - 08/09/23 08/09/23 - 08/16/23 08/16/23 - 08/23/23 08/23/23 - 08/30/23 08/30/23 - 09/06/23 09/06/23 - 09/12/23 09/12/23 - 09/20/23 09/20/23 - 09/27/23 09/27/23 - 10/03/23 10/03/23 - 10/11 /23 10/11/23 - 10/18/23 10/18/23 - 10/25/23 10/25/23 - 11/01/23 11/01/23 - 11/08/23 11 /08/23 - 11 /15/23 11/15/23 - 11/21/23 11/21/23 - 11/29/23 11 /29/23 - 12/06/23 12/06/23 - 12/13/23 12/13/23 - 12/20/23 12/20/23 - 12/27/23 12/27/23 - 01/03/24 AVERAGE GROSS BETA ANALYSES OF AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in units of E-03 pCi/cu.m. +/- 2 sigma 10S3 21 +/- 3 15 +/- 2 12 +/- 2 6 +/- 2 12 +/- 2 15 +/- 2 18 +/- 2 15 +/- 2 15 +/- 3 11 +/- 2 8 +/- 2 18 +/- 2 18 +/- 2 18 +/- 2 21 +/- 3 13 +/- 2 11 +/- 2 9 +/- 2 8 +/- 2 17 +/- 2 12 +/- 2 13 +/- 2 17 +/- 2 21 +/- 5 13 +/- 2 11 +/- 2 19 +/- 2 19 +/- 3 21 +/- 3 18 +/- 2 16 +/- 2 16 +/- 2 18 +/- 2 16 +/- 2 17 +/- 2 21 +/- 3 21 +/- 3 17 +/- 2 11 +/- 2 16 +/- 3 18 +/- 2 10 +/- 2 12 +/- 2 17 +/- 2 24 +/- 3 17 +/- 2 23 +/- 3 13 +/- 2 20 +/- 3 16 +/- 2 18 +/- 2 18 +/- 2 12 +/- 2 16 +/- 8 C-3

TABLE C-2 GAMMA SPECTROSCOPIC ANALYSES OF COMPOSITED AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION SITE PERIOD Be-7 K-40 Cs-134 Cs-137 8G1 12/28/22 - 03/29/23 76 +/- 16

< 16

< 1

< 1 03/29/23 - 06/28/23 87 +/- 23

< 23

< 2

< 1 06/28/23 - 10/03/23 102 +/- 19

< 20

< 1

< 1 10/03/23 - 01/03/24 63 +/- 13

< 20

< 1

< 1 AVERAGE 82 +/- 33 3S2 12/28/22 - 03/29/23 56 +/- 19

< 19

< 1

< 1 03/29/23 - 06/28/23 95 +/- 25

< 15

< 1

< 1 06/28/23 - 10/03/23 102 +/- 19

< 17

< 1

< 1 10/03/23 - 01/03/24 78 +/- 24

< 20

< 1

< 1 AVERAGE 83 +/- 41 12E1 12/28/22 - 03/29/23 83 +/- 21

< 23

< 1

< 1 03/29/23 - 06/28/23 121 +/- 23

< 23

< 1

< 1 06/28/23 - 10/03/23 92 +/- 19

< 17

< 1

< 1 10/03/23 - 01/03/24 73 +/- 19

< 19

< 1

< 1 AVERAGE 92 +/- 41 12S1 12/28/22 - 03/29/23 85 +/- 24

< 21

< 2

< 1 03/29/23 - 06/28/23 113 +/- 24

< 22

< 1

< 1 06/28/23 - 10/03/23 87 +/- 15

< 14

< 1

< 1 10/03/23 - 01/03/24 62 +/- 14

< 10

< 1

< 1 AVERAGE 87 +/- 41 13S6 12/28/22 - 03/29/23 79 +/- 18

< 16

< 1

< 1 03/29/23 - 06/28/23 110 +/- 25

< 20

< 1

< 1 06/28/23 - 10/03/23 95 +/- 18

< 16

< 1

< 1 10/03/23 - 01/03/24 95 +/- 16

< 12

< 1

< 1 AVERAGE 95 +/- 26 981 12/28/22 - 03/29/23 69 +/- 18

< 14

< 1

< 1 03/29/23 - 06/28/23 92 +/- 21

< 16

< 1

< 1 06/28/23 - 10/03/23 126 +/- 20

< 18

< 1

< 1 10/03/23 - 01 /03/24 64 +/- 18

< 19

< 1

< 1 AVERAGE 88 +/- 57 10S3 12/28/22 - 03/29/23 84 +/- 21

< 21

< 1

< 1 03/29/23 - 06/28/23 107 +/- 23

< 18

< 1

< 1 06/28/23 - 1 0/03/23 92 +/- 19

< 9

< 1

< 1 10/03/23 - 01 /03/24 75 +/- 16

< 13

< 1

< 1 AVERAGE 89 +/- 27 C-4

TABLE C-3 IODINE-131 ANALYSES OF AIR IODINE SAMPLES SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 3S2 8G1 12E1 12S1 13S6 9B1 12/28/22 - 01/04/23

< 9

< 15

< 9

< 8 01/04/23 - 01/11/23

< 15

< 26

< 15

< 7

< 16

< 28 01/11/23 - 01/18/23

< 21

< 20

< 21

< 9

< 22

< 21 01/18/23 - 01/24/23

< 19

< 21

< 20

< 21

< 19

< 20 01/24/23 - 02/01/23

< 11

< 20

< 19

< 20

< 19 02/01/23 - 02/08/23

< 30

< 20

< 28

< 55

< 29

< 19 02/08/23 - 02/15/23

< 31

< 35

< 34

< 31

< 33 02/15/23 - 02/22/23

< 23

< 9

< 21

< 17 02/22/23 - 02/28/23

< 23

< 22

< 21

< 16

< 11 02/28/23 - 03/08/23

< 20

< 19

< 18

< 19

< 18 03/08/23 - 03/15/23

< 15

< 24

< 33

< 34

< 23 03/15/23 - 03/22/23

< 21

< 22

< 21

< 9 03/22/23 - 03/29/23

< 28

< 26

< 27

< 12

< 26 03/29/23 - 04/05/23

< 17

< 18

< 16

< 8

< 17

< 17 04/05/23 - 04/12/23

< 23

< 20

< 22

< 14 04/12/23 - 04/19/23

< 23

< 31

< 22

< 9

< 17 04/19/23 - 04/26/23

< 11

< 17

< 20

< 19

< 11 04/26/23 - 05/03/23

< 30

< 21

< 20

< 21

< 29

< 9 05/03/23 - 05/10/23

< 33

< 32

< 31

< 32

< 31 05/10/23 - 05/17/23

< 26

< 21

< 20

< 26

< 9 05/17/23 - 05/24/23

< 8

< 17

< 16

< 17 05/24/23 - 05/30/23

< 31

< 12

< 31

< 31 05/30/23 - 06/06/23

< 10

< 14

< 35

< 34

< 13

< 34 06/06/23 - 06/12/23

< 49

< 41

< 28

< 50

< 48

< 30 06/12/23 - 06/20/23

< 17

< 7

< 17

< 17 06/20/23 - 06/28/23

< 19

< 13

< 32

< 34

< 23

< 33 06/28/23 - 07/05/23

< 35

< 8

< 18

< 19

< 36

< 19 07/05/23 - 07/11/23

< 19

< 12

< 8

< 20

< 19

< 6 07/11/23 - 07/18/23

< 7

< 17

< 13

< 18

< 10

< 17 07/18/23 - 07/26/23

< 26

< 23

< 22

< 23

< 11

< 9 07/26/23 - 08/02/23

< 11

< 27

< 28

< 13

< 11 08/02/23 - 08/09/23

< 18

< 25

< 8

< 10 08/09/23 - 08/16/23

< 20

< 25

< 20

< 21

< 24 08/16/23 - 08/23/23

< 22

< 23

< 24

< 23

< 10 08/23/23 - 08/30/23

< 29

< 30

< 29

< 14

< 31

< 29 08/30/23 - 09/06/23

< 22

< 34

< 35

< 23

< 14 09/06/23 - 09/12/23

< 30

< 31

< 29

< 31

< 13

< 31 09/12/23 - 09/20/23

< 21

< 17

< 21

< 12 09/20/23 - 09/27/23

< 24

< 8

< 22

< 22 09/27 /23 - 10/03/23

< 25

< 16

< 17

< 27

< 9 1 0/03/23 - 1 0/11 /23

< 21

< 9

< 21

< 22

< 9

< 9 10/11/23 - 10/18/23

< 10

< 30

< 25

< 31 10/18/23 - 10/25/23

< 33

< 21

< 35

< 16 10/25/23 - 11/01/23

< 11

< 38

< 22

< 23

< 41 11/01/23 - 11/08/23

< 12

< 21

< 10

< 15

< 22 11 /08/23 - 11 /15/23

< 11

< 19

< 13

< 19 11/15/23 - 11/21/23

< 27

< 31

< 30

< 20

< 30 11/21/23 - 11/29/23

< 28

< 38

< 28

< 27

< 11

< 38 11 /29/23 - 12/06/23

< 28

< 14

< 27

< 26

< 29

< 13 12/06/23 - 12/13/23

< 36

< 30

< 38

< 12 12/13/23 - 12/20/23

< 19

< 15

< 19

< 10

< 14 12/20/23 - 12/27/23

< 12

< 16

< 15

< 14

< 7 12/27/23 - 01/03/24

< 16

< 25

< 26

< 10

< 9

< 27 AVERAGE C-5

TABLE C-3 IODINE-131 ANALYSES OF AIR IODINE SAMPLES SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 12/28/22 - 01/04/23 01/04/23 - 01/11/23 01/11/23 - 01/18/23 01/18/23 - 01/24/23 01 /24/23 - 02/01 /23 02/01/23 - 02/08/23 02/08/23 - 02/15/23 02/15/23 - 02/22/23 02/22/23 - 02/28/23 02/28/23 - 03/08/23 03/08/23 - 03/15/23 03/15/23 - 03/22/23 03/22/23 - 03/29/23 03/29/23 - 04/05/23 04/05/23 - 04/12/23 04/12/23 - 04/19/23 04/19/23 - 04/26/23 04/26/23 - 05/03/23 05/03/23 - 05/10/23 05/10/23 - 05/17/23 05/17/23 - 05/24/23 05/24/23 - 05/30/23 05/30/23 - 06/06/23 06/06/23 - 06/12/23 06/12/23 - 06/20/23 06/20/23 - 06/28/23 06/28/23 - 07 /05/23 07/05/23 - 07/11/23 07/11/23 - 07/18/23 07/18/23 - 07/26/23 07 /26/23 - 08/02/23 08/02/23 - 08/09/23 08/09/23 - 08/16/23 08/16/23 - 08/23/23 08/23/23 - 08/30/23 08/30/23 - 09/06/23 09/06/23 - 09/12/23 09/12/23 - 09/20/23 09/20/23 - 09/27/23 09/27/23 - 10/03/23 10S3

< 4

< 15

< 21

< 13

< 19

< 29

< 15

< 10

< 23

< 20

< 34

< 22

< 28

< 16

< 21

< 22

< 20

< 22

< 14

< 22

< 17

< 31

< 34

< 47

< 17

< 34

< 20

< 18

< 24

< 29

< 26

< 10

< 24

< 31

< 34

< 30

< 17

< 22

< 16 10/03/23 - 10/11/23

< 21 10/11/23 - 10/18/23

< 25 10/18/23 - 10/25/23

< 21 10/25/23 - 11/01/23

< 22 11/01/23 - 11/08/23

< 23 11/08/23 - 11/15/23

< 23 11/15/23 - 11/21/23

< 32 11/21/23 - 11/29/23

< 30 11 /29/23 - 12/06/23

< 12 12/06/23 - 12/13/23

< 32 12/13/23 - 12/20/23

< 20 12/20/23 - 12/27/23

< 17 12/27/23 - 01/03/24

< 27 AVERAGE C-6

TABLE C-4 LOCATION ONSITE 1S2 2S2 2S3 3S2 3S3 4S3 4S6 5S4 5S7 6S4 6S9 7S6 7S7 8S2 9S2 9S3 9S4 10S1 10S2 11S7 12S1 12S3 12S7 13S2 13S5 13S6 14S5 15S5 16S1 16S2 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

First Quarter 1/6/2023 to 4/21/2023 28.0 +/- 2.0 14.3 +/- 0.7 21.6 +/- 0.3 12.3 +/- 0.9 12.9 +/- 0.9 19.6 +/- 0.7 14.7 +/- 1.0 11.2 +/- 1.7 16.7 +/- 0.7 23.3 +/- 1.0 20.5 +/- 1.4 18.9 +/- 0.9 13.0 +/- 0.1 21.6 +/- 0.2 36.5 +/- 6.8 19.2 +/- 0.9 14.7 +/- 0.2 13.5 +/- 1.0 21.9 +/- 0.1 14.6 +/- 0.1 15.9 +/- 0.9 18.6 +/- 0.2 (4)

(4) 21.3 +/- 1.0 20.3 +/- 1.0 18.3 +/- 1.8 16.1 +/- 1.3 17.3 +/- 0.3 23.4 +/- 0.7 19.0 +/- 0,7 Second Quarter 4/21/2023 to 7/27/2023 28.5 +/- 3.7 15.2 +/- 0.2 23.6 +/- 4.3 11.1 +/- 3.2 14.6 +/- 0.1 19.8 +/- 1.9 14.3 +/- 0.9 13.9 +/- 0.5 15.5 +/- 3.4 22.4 +/- 3.1 24.5 +/- 1.3 22.5 +/- 0.9 11.1 +/- 0.5 24.1 +/- 4.3 38.9 +/- 0.9 20.0 +/- 1.0 16.6 +/- 1.0 10.3 +/- 2.1 25.0 +/- 1.1 15.5 +/- 1.1 16.1 +/- 1.8 20.3 +/- 2.4 11.9 +/- 1.4 25.3 +/- 2.5 20.7 +/- 3.3 21.5 +/- 0.6 20.7 +/- 0.3 18.2 +/- 3.0 19.4 +/- 0.3 21.0 +/- 3.3 Third Quarter 7/27/2023 to 10/3/2023 22.8 +/- 0.6 13.2 +/- 2.2 20.8 +/- 3.4 14.0 +/- 1.7 13.2 +/- 0.3 19.7 +/- 1.6 9.6 +/- 0.5 13.1 +/- 1.0 16.8 +/- 1.0 20.9 +/- 2.8 19.8 +/- 2.2 19.1 +/- 3.4 10.6 +/- 0.8 17.1 +/- 1.4 40.0 +/- 0.6 18.2 +/- 0.1 17.8 +/- 0.7 12.5 +/- 0.9 23.1 +/- 0.6 14.1 +/- 1.3 18.0 +/- 1.1 19.7 +/- 4.0 12.8 +/- 0.1 19.5 +/- 2.3 16.8 +/- 0.9 18.6 +/- 2.6 16.3 +/- 0.7 15.1 +/- 2.4 23.1 +/- 2.2 18.7 +/- 3.2 See the comments at the end of this table.

C-7 Fourth Quarter 10/3/2023 to 1/5/2024 23.8 +/- 3.8 11.9 +/- 0.1 20.2 +/- 1.7 12.2 +/- 1.3 13.3 +/- 1.5 18.5 +/- 1.2 13.0 +/- 1.8 11.2 +/- 1.4 14.8 +/- 0.1 21.7 +/- 2.0 20.9 +/- 0.8 20.3 +/- 3.6 12.4 +/- 0.1 20.5 +/- 0.8 38.4 +/- 6.0 18.7 +/- 2.6 15.0 +/- 0.5 12.3 +/- 0.5 23.7 +/- 2.1 14.0 +/- 1.6 15.5 +/-0.3 16.4 +/- 0.7 12.3 +/- 0.4 18.2 +/- 0.2 20.4 +/- 0.5 18.8 +/- 3.6 14.5 +/- 1.9 15.6 +/- 1.3 22.0 +/- 3.0 18.8 +/- 2.3

TABLE C-4 LOCATION 0-1 MILE OFFSITE 6A4 8A3 15A3 16A2 1-2 MILES OFFSITE 8B2 9B1 10B3 3-4 MILES OFFSITE 1D5 8D3 9D4 10D1 12D2 14D1 4-5 MILES OFFSITE 3E1 4E2 5E2 6E1 7E1 11E1 12E1 13E4 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

First Quarter 1/6/2023 to 4/21/2023 14.7 +/- 0.5 16.3 +/- 1.1 12.5 +/- 0.1 12.3 +/- 0.1 12.1 +/- 1.9 10.2 +/- 0.8 13.4 +/- 0.7 14.0 +/- 0.9 12.7 +/- 0.6 14.5 +/- 0.4 14.4 +/- 0.1 19.2 +/- 0.7 13.9 +/- 0.9 10.5 +/- 0.4 15.0 +/- 0.6 15.5 +/- 0.9 15.6 +/- 1.6 14.2 +/- 0.4 11.7 +/- 0.5 13.9 +/- 0.5 17.9 +/- 0.6 Second Quarter 4/21/2023 to7/27/2023 17.4 +/- 2.9 14.3 +/- 1.5 13.9 +/- 1.7 12.7 +/- 3.9 15.6 +/- 3.1 9.9 +/- 1.9 11.9 +/- 0.7 17.7 +/- 3.3 16.7 +/- 2.6 18.0 +/- 0.1 17.5 +/- 1.1 17.8 +/- 5.6 15.9 +/- 1.3 15.1 +/- 3.5 17.7 +/- 1.6 16.2 +/- 1.9 17.1 +/- 0.7 16.7 +/- 1.3 12.6 +/- 1.2 14.1 +/- 1.6 17.0 +/- 5.3 Third Quarter 7/27/2023 to 10/3/2023 14.6 +/- 0.9 14.0 +/- 1.2 12.1 +/- 1.7 12.1 +/- 3.0 10.8 +/- 2.2 8.8 +/- 1.6 12.3 +/- 0.8 12.6 +/- 0.8 14.2 +/- 0.1 12.0 +/- 2.0 15.2 +/- 1.5 17.5 +/- 1.2 13.2 +/- 3.1 9.7 +/- 0.6 16.8 +/- 0.3 12.5 +/- 0.9 15.5 +/- 2.0 13.6 +/- 0.9 9.1 +/- 2.2 11.2 +/- 0.1 15.8 +/- 4.5 See the comments at the end of this table.

C-8 Fourth Quarter 10/3/2023 to 1/5/2024 16.7 +/- 1.7 12.2 +/- 2.0 10.5 +/- 0.7 11.4 +/- 1.4 10.7 +/- 2.4 9.8 +/- 0.8 11.3 +/- 1.2 14.1 +/- 1.5 12.1 +/- 2.4 14.0 +/- 0.0 14.4 +/- 0.9 20.0 +/- 0.7 11.5 +/- 0.5 11.6 +/- 0.7 14.1 +/- 0.5 13.3 +/- 2.5 14.1 +/- 1.8 14.9 +/- 0.3 10.7 +/- 0.2 12.0 +/- 0.2 15.0 +/- 0.5

TABLE C-4 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

LOCATION 5-10 MILES OFFSITE 2F1 15F1 16F1 10-20 MILES OFFSITE 3G4 4G1 7G1 12G1 12G4 First Quarter 1/6/2023 to 4/21/2023 12.5 +/- 0.7 15.9 +/- 1.4 17.2 +/- 0.1 16.4 +/- 1.2 14.0 +/- 1.7 12.9 +/- 1.8 13.7 +/- 1.2 12.5 +/- 1.2 See the comments at the end of this table.

LOCATION INDICATOR Average (5)

CONTROL Average (5)

COMMENTS 16.6 +/- 10.1 13.9 +/- 3.2 Second Quarter 4/21/2023 to 7/27/2023 16.9 +/- 3.2 16.4 +/- 0.3 16.6 +/- 1.3 19.1 +/- 0.3 18.4 +/- 2.0 16.1 +/- 0.3 14.1 +/- 0.1 17.3 +/- 0,3 17.7 +/- 17.0 17.0 +/- 2.1 (1) Individual monitor location results are normally the average of the elemental doses of four elements from the two dosimeters assigned to each monitoring location.

(2) A standard (std.) quarter (qtr.) is considered to be 91.25 days. Results obtained for monitoring periods of other durations are normalized by multiplying them by 91.25/x, where xis the actual duration in days of the period.

(3) Uncertainties for individual monitoring location results are two standard deviations of the elemental doses of four elements from the two dosimeters assigned to each monitoring location, representing the variability between the elemental doses of each of the four dosimeter elements.

Third Quarter 7/27/2023 to 10/3/2023 12.7 +/- 0.7 16.4 +/- 2.0 15.4 +/- 4.6 14.4 +/- 0.6 13.8 +/- 1.8 11.5 +/- 2,1 11.7 +/- 1,7 11.9 +/- 0.3 15.8 +/- 14.1 12.6 +/- 3.3 (4)

No measurement could be made at this location because the dosimeters were lost, stolen, or damaged. Refer to Appendix A of the Annual Radiological Environmental Operating Report for an explanation of program exceptions to REMP.

(5) Uncertainties associated with quarterly indicator and control averages are two standard deviations, representing the variability between the results of the individual monitoring locations.

C-9 Fourth Quarter 10/3/2023 to 1/5/2024 14.4 +/- 1.2 15.5 +/- 2.9 18.1 +/- 1.1 17.7 +/- 0.4 17.9 +/- 1.2 11.3 +/- 2,7 12.0 +/- 1.4 10.9 +/- 0.6 15.8 +/- 12.8 13.9 +/- 3.4

TABLE C-5 IODINE-131 AND GAMMA SPECTROSCOPIC ANALYSES OF MILK SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION

<----------GAMMA EMITTERS---------->

SITE DATE 1-131 K-40 Cs-134 Cs-137 Ba-140 La-140 Th-228 10G1 01/09/23

< 0.8 1089 +/- 196

< 7

< 10

< 29

< 10

< 14 02/06/23

< 0.9 1216 +/- 195

< 7

< 8

< 42

< 15

< 15 03/06/23

< 0.5 1419 +/- 186

< 7

< 26

< 6

< 14 04/10/23

< 0.9 1626 +/- 142

< 5

< 20

<7

< 10 04/24/23

< 0.7 1028 +/- 167

< 7

< 9

< 32

< 10

< 16 05/07/23

< 0.6 1304 +/- 156

< 7

< 9

< 41

< 14

< 15 05/22/23

< 0.7 1269 +/- 197

< 7

< 8

< 25

< 8

< 13 06/04/23

< 0.9 1308 +/- 190

< 5

< 7

< 37

< 15

< 12 06/19/23

< 0.7 2009 +/- 212

< 8

< 27

< 7

< 14 07/03/23

< 0.9 1284 +/- 134

< 5

< 6

< 21

< 5

< 8.3 07/16/23

< 0.9 1281 +/- 156

< 6

< 7

< 28

< 5

< 11 07/31/23

< 0.9 1280 +/- 173

< 7

< 8

< 28

< 11

< 15 08/13/23

< 0.9 1152 +/- 169

< 7

< 8

< 31

< 11

< 13 08/28/23

< 0.8 1155 +/- 167

< 6

< 9

< 24

< 8

< 14 09/10/23

< 0.7 1146 +/- 177

< 7

< 30

< 7

< 12 09/25/23

< 0.9 1298 +/- 159

< 7

< 8

< 26

< 10

< 13 10/09/23

< 0.8 1346 +/- 180

<7

< 8

< 32

< 8

< 18 10/22/23

< 0.8 1264 +/- 164

< 6

< 9

< 27

< 9

< 13 11/06/23

< 0.5 1335 +/- 163

< 8

< 7

< 24

< 9

< 13 12/04/23

< 0.8 1238 +/- 156

< 6

< 19

<6

< 11 AVERAGE 1302 +/- 417 13E3 01/09/23

< 0.9 1279 +/- 150

< 8

< 7

< 27

< 9

< 16 02/06/23

< 0.7 1112 +/- 186

< 6

< 7

< 44

< 11

< 14 03/06/23

< 0.8 1081 +/- 186

< 6

< 9

< 31

< 10

< 12 04/10/23

< 0.8 1595 +/- 130

< 6

< 23

< 7

< 12 04/24/23

< 0.6 1289 +/- 180

< 6

< 9

< 30

< 7

< 16 05/07/23

< 0.6 1295 +/- 185

<7

< 9

< 31

< 12

< 15 05/22/23

< 0.8 1134 +/- 179

< 6

< 8

< 26

< 7

< 13 06/04/23

< 0.8 1264 +/- 193

< 7

< 9

< 37

< 8

< 15 06/19/23

< 0.7 1116 +/- 169

< 7

< 9

< 25

< 7

< 12 07/03/23

< 0.7 1430 +/- 111

< 5

< 22

<6

< 11 07/16/23

< 0.7 1192 +/- 170

< 6

< 7

< 24

< 10

< 12 07/31/23

< 0.8 1328 +/- 152

<5

< 6

< 21

< 8

< 12 08/13/23

< 0.8 1166 +/- 186

< 8

< 29

< 9

< 12 08/28/23

< 0.7 1424 +/- 207

< 8

< 9

< 27

< 9

< 13 09/10/23

< 0.8 1217 +/- 188

< 7

< 6

< 33

< 13

< 15 09/25/23

< 0.9 1183 +/- 196

< 8

< 25

< 8

< 14 10/09/23

< 0.9 1260 +/- 188

< 5

< 7

< 27

< 7

< 15 10/22/23

< 0.7 1413 +/- 145

< 8

< 28

< 10

< 16 11/06/23

< 0.6 1478 +/- 150

< 6

< 7

< 25

< 9

< 12 12/04/23

< 0.9 1339 +/- 172

< 7

< 8

< 25

< 6

< 13 AVERAGE 1280 +/- 274 C-10

TABLE C-5 IODINE-131 AND GAMMA SPECTROSCOPIC ANALYSES OF MILK SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION

<----------GAMMA EMITTERS---------->

SITE DATE 1-131 K-40 Cs-134 Cs-137 Ba-140 La-140 Th-228 5E2 01/09/23

< 0.8 1366 +/- 187

< 5

< 7

< 33

< 9

< 13 02/06/23

< 0.8 1198 +/- 171

< 7

< 8

< 33

< 11

< 15 03/06/23

< 0.5 1056 +/- 153

< 8

< 9

< 28

< 9

< 14 04/10/23

< 0.9 1203 +/- 117

< 4

< 5

< 18

< 4

< 9 04/24/23

< 0.7 1269 +/- 176

< 7

< 8

< 31

< 6

< 16 05/07/23

< 0.9 1153+/-214

< 8

< 38

< 10

< 13 05/22/23

< 0.9 1163 +/- 171

< 5

< 7

< 29

< 8

< 15 06/04/23

< 0.7 1288 +/- 185

< 8

< 29

< 7

< 13 06/19/23

< 0.8 1148 +/- 172

< 6

< 19

< 4

< 12 07/03/23

< 0.7 1405 +/- 145

< 5

< 7

< 25

< 5

< 11 07/16/23

< 0.9 1135 +/- 145

< 5

< 6

< 25

< 5

< 12 07/31/23

< 0.6 1076 +/- 144

< 6

< 8

< 28

< 7

< 12 08/13/23

< 0.8 1397 +/- 170

< 7

< 8

< 32

< 13

< 12 08/28/23

< 0.8 1169 +/- 207

< 7

< 9

< 28

< 7

< 13 09/10/23

< 0.8 1258 +/- 152

< 6

< 8

< 29

< 10

< 14 09/25/23

< 0.9 1251 +/- 161

< 7

< 26

< 7

< 16 10/09/23

< 0.9 1175 +/- 194

< 8

< 7

< 38

< 10

< 14 10/22/23

< 0.8 1315 +/- 199

< 7

< 6

< 30

< 11

< 14 11/06/23

< 0.9 1389 +/- 123

< 4

< 5

< 20

< 6

< 8.5 12/04/23

< 0.8 1267 +/- 154

< 7

< 9

< 31

< 7

< 16 AVERAGE 1234 +/- 208 C-11

TABLE C-6 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF GROUNDWATER SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION

<----------GAMMA EMITTERS---------->

SITE DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Th-228 2S8 01/20/23

< 242

< 64

< 6

< 9

< 16

< 9

< 13

< 9

< 14

< 10

< 7

< 9

< 29

< 10

< 14 04/27/23

< 347

< 80

< 4

< 5

< 10

< 7

< 8

< 6

< 9

< 5

< 26

< 7

< 10 07/19/23

< 386

< 111

< 6

< 16

< 6

< 11

< 8

< 11

< 12

< 6

< 7

< 30

< 8

< 13 10/26/23

< 398

< 77

< 4

< 10

<5

< 11

< 5

< 7

< 8

< 5

< 4

< 20

< 7

< 10 AVERAGE 13S7 01/17/23

< 377

< 122

< 7

< 18

< 6

< 15

< 6

< 12

< 9

< 6

< 25

< 8

< 14 04/25/23

< 386

< 85

< 6

< 7

< 19

< 6

< 11

< 7

< 12

< 7

< 6

< 22

< 10

< 13 07/25/23

< 377

< 16

< 2

< 5

< 2

< 4

< 2

< 3

< 1

< 2

< 7

< 3

< 3 10/24/23

< 361 96 +/- 56

< 7

< 21

<8

< 18

< 8

< 13

< 12

< 7

< 29

< 8

< 13 AVERAGE 96 +/- 0 1S3 01/17/23

< 377

< 101

< 5

< 7

< 13

< 5

< 14

< 6

< 7

< 11

< 6

< 31

< 8

< 11 04/25/23

< 386

< 136

< 5

< 6

< 20

< 7

< 14

< 7

< 12

< 8

< 7

< 28

< 11

< 14 07/26/23

< 368

< 112

< 6

< 18

< 7

< 10

< 6

< 12

< 9

< 6

< 5

< 30

< 11

< 13 10/24/23

< 382

< 128

< 7

< 16

<8

< 13

< 6

< 13

< 10

< 6

< 25

< 10

< 11 AVERAGE 4S8 01/17/23

< 376

< 132

< 8

< 7

< 15

< 7

< 19

< 9

< 13

< 10

< 8

< 37

< 9

< 17 04/25/23

< 390

< 124

< 7

< 8

< 18

< 10

< 12

< 5

< 13

< 10

< 5

< 9

< 28

< 9

< 14 07/25/23

< 373

< 106

< 8

< 6

< 15

< 7

< 15

< 6

< 12

< 11

< 6

< 7

< 34

< 10

< 11 10/24/23

< 377

< 128

< 7

< 20

<9

< 15

< 8

< 11

< 8

< 36

< 9

< 16 AVERAGE 4S9 01/20/23

< 240

< 137

< 6

< 21

< 7

< 12

< 7

< 13

< 9

< 6

< 7

< 29

< 11

< 12 04/27/23

< 360

< 110

< 5

< 17

< 6

< 11

< 6

< 10

< 5

< 26

< 10

< 11 07/19/23

< 384

< 108

< 5

< 14

< 7

< 10

< 6

< 9

< 11

< 5

< 27

< 7

< 12 10/30/23

< 375

< 52

< 7

< 6

< 17

<9

< 15

< 8

< 13

< 8

< 7

< 38

< 12

< 15 AVERAGE 6S11A 01/17/23

< 381

< 115

< 7

< 6

< 19

< 8

< 14

< 7

< 9

< 7

< 25

< 10

< 11 04/25/23

< 395

< 146

< 6

< 7

< 17

< 9

< 12

< 6

< 11

< 8

< 6

< 8

< 25

< 8

< 12 07/20/23

< 388

< 135

< 4

< 7

< 13

<6

< 14

< 7

< 9

< 7

< 6

< 30

< 14

< 12 10/30/23

< 369

< 104

< 5

< 6

< 18

< 8

< 15

< 6

< 13

< 14

< 6

< 32

< 13

< 14 AVERAGE C-12

TABLE C-6 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF GROUNDWATER SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION

<----------GAMMA EMITTERS---------->

SITE DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Th-228 6S12 01/20/23

< 244

< 90

< 6

< 5

< 15

< 6

< 15

< 7

< 10

< 6

< 5

< 23

< 9

< 13 04/27/23

< 342

< 101

< 5

< 7

< 15

<7

< 12

< 7

< 10

< 8

< 5

< 6

< 26

< 8

< 9 07/20/23

< 381

< 83

< 5

< 13

< 4

< 11

< 6

< 8

< 9

< 4

< 5

< 29

< 7

< 9 10/30/23

< 377

< 88

< 5

< 6

< 17

< 5

< 11

< 7

< 12

< 9

< 5

< 7

< 29

< 12

< 11 AVERAGE 7S10 01/16/23

< 373

< 129

< 6

< 8

< 21

< 5

< 13

< 8

< 11

< 9

< 7

< 6

< 25

< 10

< 15 04/27/23

< 358

< 87

< 5

< 4

< 13

<6

< 10

< 7

< 9

< 8

< 5

< 24

< 8

< 10 07/20/23

< 386

< 97

< 6

< 14

< 7

< 12

< 7

< 8

< 10

< 6

< 31

< 12

< 10 10/26/23

< 368

< 96

< 5

< 14

< 5

< 11

< 6

< 9

< 8

< 4

< 5

< 20

< 8

< 10 AVERAGE 7S11 01/16/23

< 379

< 119

< 7

< 6

< 15

< 6

< 15

< 6

< 10

< 11

< 6

< 7

< 31

< 8

< 13 04/27/23

< 361

< 108

< 5

< 6

< 16

< 6

< 9

< 5

< 9

< 8

< 5

< 6

< 24

< 7

< 12 07/20/23

< 385

< 115

< 6

< 5

< 14

< 7

< 12

< 6

< 12

< 11

< 5

< 6

< 31

< 10

< 10 10/26/23

< 397

< 77

< 5

< 12

< 6

< 9

< 5

< 8

< 7

< 4

< 5

< 22

< 7

< 8 AVERAGE 8S4 01/17/23

< 394

< 132

< 6

< 4

< 19

< 7

< 13

< 5

< 10

< 8

< 5

< 6

< 28

< 9

< 12 04/25/23

< 386

< 127

< 8

< 10

< 14

< 8

< 23

< 12

< 14

< 11

< 8

< 30

< 12

< 17 07/26/23

< 369

< 139

< 6

< 7

< 20

< 7

< 15

< 7

< 10

< 11

< 6

< 32

< 11

< 12 10/24/23

< 396

< 108

< 7

< 8

< 23

< 5

< 17

< 8

< 13

< 10

< 8

< 7

< 34

< 11

< 12 AVERAGE 1S4 01/17/23

< 370

< 156

< 7

< 18

< 7

< 12

< 6

< 15

< 8

< 9

< 28

< 9

< 17 04/25/23

< 386

< 130

< 6

< 17

< 8

< 10

< 8

< 13

< 9

< 5

< 7

< 29

< 9

< 12 07/25/23

< 371

< 90

< 5

< 15

< 4

< 11

< 5

< 10

< 9

< 5

< 24

< 6

< 10 10/24/23

< 376

< 98

< 8

< 7

< 15

< 6

< 11

< 7

< 13

< 10

< 8

< 7

< 30

< 8

< 12 AVERAGE C-13

TABLE C-7 SITE Precip Sites 3S2**, 12S1,.,., BG1** (offsite, controls)

Precip Sites 1 and 2 (onsite, East of Station Reactor Bldgs)

Precipitation Sites 3 and 4 (onsite, West of Station Reactor Bldgs) 1S3-MW-1 (43')

1 S4 - Tap Water Sample 4S8 - MW-2 ( 45')

4S9 - MW-3 (94')

8S4-MW-4 (111')

7S10 - MW-5 (36')

13S7 - MW-6 (16')

2S8 - MW-7 (85')

6S11A-MW-BA (14')

6S11B-MW-BB (19')

6S 12 - MW-9 (28')

7S11 - MW-10 (132')

"12F3 - Groundwater Control "LTAW-Surface Water

Revised values to reflect full scope of precipitation data.

- Stations were discontinued after 5/30/18.

ANNUAL AVERAGE TRITIUM CONCENTRATION IN PRECIPITATION, MONITORING WELLS AND LAKE TOOK-A-WHILE (LTAW) SURFACE WATER DATA SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 62' 49 40 38 82 63 51 39 45 32 370 230' 193 216 242 182 142 250 206 251 414 404' 350 233 169 151 231 258 197 383 248 150 252 131 164 197 115 169 175 130 Not Not Not Not Not Not Not Not Not Not sampled sampled sampled sampled sampled sampled sampled sampled sampled sampled 292 154 190 173 137 202 187 138 154 138 127 54 150 64 80 135 94 180 125 55 172 66 105 68 81 109 60 162 145 91 171 69 96

-6 74 106 68 70 73 51 142 134 143 34 80 111 71 79 111 107 Not Not Not installed installed installed 22 54 72 70 70 74 56 177 82 165 58 15 72 103 110 63 38 Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well 30

-44 45 18 6

60 21 57 70 5

3

-27

-9 1

-1 23 29 55 13 1

26

-53

-2 5

-6 45

-26 20 41 61 179 104 110 132 132 145 27 73 89 77 C-14 2018 2019 2020 2021 2022 2023 45 325 333 252 336 273 275 494 355 350 382 467 387 218 253 200 187 182 168 Not Not sampled sampled 28 44

-17 41 191 196 239 194 282 106 109 92 77 86 102 205 102 155 96 109 181 148 93 125 86 82 62 207 122 120 150 110 83 179 37 71 63 35 86 62 50 83 72 48 30 44 Dry well Dry well Dry well Dry well Dry well Dry well 27 50 47 41 9

76 33 16 3

7 23

-29 82 135 20

TABLE C-8 GROSS BETA, TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF DRINKING WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION PERIOD

<----------GAMMA EMITTERS---------->

SITE START STOP Gr-B H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 12H2 12/27/22 - 01/31/23

< 1.8

< 352

< 42

< 2

< 7

< 2

< 4

< 2

< 4

< 15

< 2

< 24

< 7 12H2 01/31/23 - 02/27/23

< 1.9

< 376

< 29

< 2

< 5

< 2

< 3

< 2

< 3

< 7

< 2

< 14

< 5 12H2 02/27/23 - 03/28/23

< 2.2

< 361

< 15

< 2

< 5

< 2

< 3

< 2

< 3

< 9

< 1

< 2

< 17

< 6 12H2 03/28/23 - 04/24/23

< 1.9

< 387

< 19

< 2

< 7

< 2

< 4

< 2

< 4

< 8

< 2

< 17

< 6 12H2 04/24/23 - 05/29/23

< 1.9

< 380

< 25

< 2

< 6

< 2

< 3

< 2

< 3

< 9

< 1

< 2

< 17

< 5 12H2 05/29/23 - 06/27/23

< 2.5

< 350

< 36

< 2

< 6

< 2

< 4

< 2

< 4

< 10

< 2

< 18

< 5 12H2 06/27/23 - 07/24/23 2.7 +/- 1.5

< 369

< 25

< 1

< 2

< 5

< 2

< 3

< 2

< 3

< 7

< 1

< 2

< 13

< 4 12H2 07/24/23 - 08/29/23

< 2.3

< 385

< 36

< 2

< 6

< 2

< 3

< 2

< 3

< 14

< 1

< 2

< 20

< 6 12H2 08/29/23 - 09/26/23

< 2.1

< 361

< 16

< 2

< 6

< 2

< 3

< 2

< 3

< 8

< 1

< 2

< 16

< 6 12H2 09/26/23 - 10/31/23 3.0 +/- 1.3

< 381

< 33

< 2

< 6

< 2

< 3

< 2

< 3

< 12

< 2

< 19

< 7 12H2 10/31/23 - 11/28/23

< 1.9

< 276

< 12

< 1

< 4

< 1

< 3

< 1

< 2

< 7

< 1

< 12

< 4 12H2 11/28/23 - 12/26/23

< 1.9

< 346

< 15

< 2

< 6

< 2

< 3

< 2

< 3

< 9

< 2

< 17

< 6 AVERAGE 2.8 +/- 0.4 C-15

TABLE C-9 GAMMA SPECTROSCOPIC ANALYSES OF FOOD PRODUCTS (FRUITS, VEGETABLES AND BROADLEAF)

SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/kg (wet) +/- 2 sigma COLLECTION SAMPLE SITE DATE TYPE Be-7 K-40 1-131 Cs-134 Cs-137 Ac-228 Th-228 1101 11/21/23 Soybeans

< 200 11580 +/- 907

< 38

< 18

< 27

< 113

< 41 11/21/23 Corn

< 213 2759 +/- 473

< 51

< 30

< 26

< 89

< 47 11/21/23 Pumpkin

< 164 1764 +/- 362

< 39

< 20

< 22

< 83

< 37 AVERAGE 5368 +/- 10806 11S6 06/19/23 Swiss Chard

< 231 2670 +/- 439

< 27

< 18

< 20

< 94

< 46 06/19/23 Collard

< 176 3566 +/- 423

< 25

< 21

< 23

< 91

< 41 07/24/23 Swiss Chard 585 +/- 219 4743 +/- 630

< 37

< 16

< 22

< 102

< 36 07/24/23 Collard 1037 +/- 231 3780 +/- 477

< 48

< 22

< 25

< 105

< 46 08/21/23 Swiss Chard

< 289 3553 +/- 583

< 24

< 23

< 20

< 100

< 39 08/21/23 Collard

< 249 2574 +/- 445

< 26

< 22

< 24

< 89

< 46 09/25/23 Swiss Chard 545 +/- 243 2074 +/- 467

< 29

< 20

< 24

< 84

< 38 09/25/23 Collard 798 +/- 347 2476 +/- 604

< 35

< 28

< 27

< 118

< 55 10/22/23 Swiss Chard 497 +/- 245 3158 +/- 544

< 26

< 21

< 88

< 45 10/22/23 Collard

< 445 3977 +/- 675

< 48

< 35

< 41

< 168

< 73 AVERAGE 692 +/- 449 3257 +/- 1635 12F7 08/08/23 String Beans

< 203 1854 +/- 435

< 32

< 20

< 23

< 99

< 40 11/15/23 Soybeans

< 268 17550 +/- 1252

< 28

< 27

< 31

< 145

< 46 11/15/23 Potatoes

< 188 3601 +/- 552

< 24

< 23

< 22

< 88

< 39 12/04/23 Corn

< 153 1972 +/- 456

< 24

< 13

< 19

< 103

< 33 AVERAGE 6244 +/- 15158 C-16

TABLE C-10 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF SURFACE WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma COLLECTION

<----------GAMMA EMIT I ERS---------->

SITE PERIOD H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 Th-228 6S6 12/27/22 - 01/31/23

< 357

< 14

< 2

< 5

< 2

< 3

< 2

< 3

< 12

<2

< 20

< 6

< 3 01/31/23 - 02/27/23

< 379

< 27

< 2

< 5

< 2

<4

< 2

< 3

< 7

< 2

<2

< 15

< 5

< 3 02/27/23 - 03/28/23

< 372

< 14

< 1

< 2

< 4

< 2

< 3

<2

< 3

< 10

< 1

< 16

< 6

< 3 03/28/23 - 04/24/23

< 398

< 29

< 2

< 5

< 2

<4

<2

< 3

< 8

< 2

<2

< 17

< 5

<4 04/28/23 - 05/29/23

< 385

< 20

<2

< 7

<2

< 4

< 2

< 4

< 10

<2

< 19

< 7

< 4 05/29/23 - 06/27/23

< 352

< 14

<2

< 2

< 5

< 2

< 3

< 2

< 3

< 9

< 2

<2

< 16

< 6

< 3 06/27/23 - 07/24/23

< 371 24 +/- 15

< 1

< 3

< 1

<2

< 1

< 2

< 5

< 1

< 10

< 3

< 2 07/24/23 - 08/29/23

< 395

< 35

< 2

< 5

< 2

< 3

< 2

< 3

< 13

<2

< 20

< 8

< 3 08/29/23 - 09/26/23

< 391

< 15

< 2

<2

< 5

< 2

< 3

< 2

< 3

< 8

< 1

<2

< 15

< 5

< 3 09/26/23 - 10/31/23

< 380 25 +/- 16

< 1

< 4

< 2

< 3

< 1

< 2

< 9

< 1

< 14

< 5

< 2 10/31/23 - 11/28/23

< 269

< 13

< 2

< 5

< 2

< 3

< 2

< 3

< 9

< 1

< 2

< 15

< 5

< 3 11/28/23 - 12/26/23

< 353

< 16

< 2

< 5

< 2

< 3

< 2

< 3

< 9

<2

< 16

< 6

< 3 AVERAGE 25 +/- 2 6S5 01/03/23 - 01/31/23

< 357

< 17

< 2

< 5

< 2

< 3

<2

< 3

< 11

< 2

< 18

< 6

< 3 02/07/23 - 02/27/23

< 373

< 35

< 2

< 6

< 2

<4

< 2

< 4

< 6

< 2

< 14

< 5

<4 03/07/23 - 03/28/23

< 375

< 21

< 2

< 6

< 2

<4

< 2

<4

< 8

<2

< 18

< 6

< 3 04/04/23 - 04/24/23

< 395

< 47

< 3

< 7

< 3

< 5

< 3

< 5

< 9

< 2

< 3

< 18

< 6

< 5 05/02/23 - 05/29/23

< 391

< 45

<2

< 2

< 7

< 3

<4

<2

< 4

< 9

<2

< 17

< 6

<4 06/06/23 - 06/27/23

< 354

< 29

< 2

< 6

< 2

<4

< 2

<4

< 13

< 2

< 23

< 7

< 3 07/03/23 - 07/24/23

< 383

< 16

< 2

< 5

< 2

< 3

< 2

< 3

< 5

< 1

< 2

< 12

<4

< 3 08/01/23 - 08/29/23

< 398

< 17

< 2

< 6

< 2

< 3

< 2

< 4

< 10

< 2

< 19

< 6

< 3 09/05/23 - 09/26/23

< 392

< 31

<2

< 6

<2

<4

< 2

< 3

< 7

< 2

< 16

< 5

< 3 10/02/23 - 10/31/23

< 370

< 32

<2

< 2

< 6

<2

<4

< 2

< 4

< 10

< 2

< 20

< 7

< 3 11/06/23 - 11/28/23

< 279

< 35

< 2

< 5

< 2

< 3

< 2

< 3

< 6

< 2

<2

< 14

< 5

< 3 12/05/23 12/26/23

< 372

< 18

< 2

< 6

< 2

< 3

< 2

< 3

< 7

< 2

<2

< 14

< 5 5 +/- 3 AVERAGE 5 +/- 0 4S7 05/01/23 - 05/01/23

< 371

< 146

< 6

< 7

< 10

< 8

< 14

< 6

< 8

< 6

< 5

< 8

< 23

< 11

< 13 07/24/23 - 07/24/23

< 376

< 36

< 2

< 5

< 2

< 4

< 2

< 3

< 2

<2

< 9

< 3

< 3 10/30/23 - 10/30/23

< 382

< 97

< 6

< 5

< 15

< 6

< 12

< 6

< 9

< 5

< 22

< 11

< 14 AVERAGE LTAW 05/01/23 - 05/01/23

< 377

< 100

< 5

< 6

< 21

< 7

< 14

< 8

< 9

< 6

< 7

< 23

< 5

< 14 07/24/23

07/24/23

< 384

< 18

< 2

< 5

< 2

< 4

< 2

< 3

<4

< 2

< 10

< 3

<4 10/30/23 - 10/30/23

< 384

< 146

< 6

< 7

< 21

< 8

< 15

< 7

< 10

< 9

< 8

< 6

< 30

< 9

< 14 AVERAGE C-17

TABLE C-10 COLLECTION SITE PERIOD 5S9 04/28/23 - 05/18/23 06/07/23 - 06/07/23 11/14/23 - 11/20/23 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF SURFACE WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/Liter +/- 2 sigma

<----------GAMMA EMITTl--'.Rs---------->

H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131

< 380

< 14

< 1

<2

< 5

<2

< 3

< 2

< 3

< 11

< 347

< 15

< 1

<2

< 5

<2

< 3

< 2

< 3

< 14

< 268

< 29

< 2

<2

< 5

<2

<4

< 2

< 3

< 7 AVERAGE C-18 Cs-134 Cs-137 Ba-140 La-140 Th-228

< 1

< 17

< 6

< 3

< 1

< 20

< 6

< 2

<2

< 14

< 5

< 3

TABLE C-11 GAMMA SPECTROSCOPIC ANALYSIS OF FISH SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/kg (wet) +/- 2 sigma COLLECTION SITE DATE K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 2H Channel Catfish 04/14/23 3198 +/- 1054

< 45

< 56

< 122

< 66

< 130

< 59

< 54 Quillback 04/14/23 3318 +/- 902

< 63

< 61

< 191

< 54

< 111

< 48

< 53 Smallmouth Bass 04/14/23 2466 +/- 1208

< 76

< 75

< 198

< 86

< 102

< 67

< 78 Channel Catfish 10/05/23 3192 +/- 1056

< 74

< 77

< 231

< 69

< 189

< 82

< 71 Smallmouth Bass 10/05/23 3629 +/- 910

< 57

< 53

< 135

< 70

< 135

< 49

< 60 Quillback 10/05/23 3132 +/- 1004

< 65

< 40

< 190

< 69

< 134

< 52

< 54 AVERAGE 3156 +/- 764 IND Channel Catfish 04/13/23 2358 +/- 913

< 59

< 52

< 143

< 69

< 130

< 42

< 55 Quillback 04/13/23 3025 +/- 766

< 58

< 53

< 116

< 50

< 110

< 45

< 53 Smallmouth Bass 04/13/23 4504 +/- 979

< 68

< 78

< 188

< 74

< 146

< 71

< 78 Channel Catfish 10/04/23 3930 +/- 1238

< 82

< 78

< 232

< 100

< 165

< 89

< 80 Quillback 10/04/23 2927 +/- 1031

< 73

< 77

< 190

< 67

< 151

< 77

< 65 Smallmouth Bass 10/04/23 4192 +/- 1153

< 50

< 75

< 195

< 55

< 149

< 60

< 66 AVERAGE 3489 +/- 1680 LTAW Gizzard Shad 10/05/23 3957 +/- 920

< 41

< 44

< 191

< 57

< 136

< 38

< 60 Largemouth Bass 10/05/23 4937 +/- 1093

< 60

< 65

< 195

< 64

< 155

< 62

< 72 AVERAGE 4447 +/- 1386 C-19

TABLE C-12 GAMMA SPECTROSCOPIC ANALYSES OF SHORELINE SEDIMENT SUSQUEHANNA STEAM ELECTRIC STATION, 2023 Results in pCi/kg (dry)+/- 2 sigma COLLECTION SITE DATE K-40 Cs-134 Cs-137 Ra-226 Ac-228 Th-228 2B 04/13/23 15470 +/- 1994

< 84

< 105 2678 +/- 1642 1045 +/- 440 1254 +/- 178 10/02/23 17170 +/- 2307

< 142

< 145

< 3146 1986 +/- 476 1562 +/- 289 AVERAGE 16320 +/- 2404 2678 +/- 0 1516 +/- 1331 1408 +/- 436 7B 04/13/23 8850 +/- 1394

< 99

< 89

< 2338 1152 +/- 268 866 +/- 215 10/02/23 13550 +/- 1985

< 102

< 123

< 2931 1385 +/- 385 1616 +/- 270 AVERAGE 11200 +/- 6647 1269 +/- 330 1241 +/- 1061 12F 04/13/23 8672 +/- 1590

< 90

< 119

< 2218 1029 +/- 346 832 +/- 192 10/02/23 14420 +/- 2219

< 89

< 103

< 2309 1525 +/- 512 897 +/- 258 AVERAGE 11546 +/- 8129 1277 +/- 701 864 +/- 91 C-20

500 450 400 350 300 250 200 150 100 50 0

E-3 pCi/m3 PRE-OP A

D

E I FIGURE C GROSS BETA ACTIVITY IN AIR PARTICULATES Unit 1 Criticality 09/10/1982 CHINESE WEAPONS TEST A- 06/17/74 B - 09/26/76 C-11/17/76 D - 09/17/77 E - 03/14/78 F -10/15/80 OPERATIONAL C-21 Indicator -- Control

Dose Rate (mrem/STD Qtr)

FIGURE C-2 -AMBIENT RADIATION LEVELS BASED ON ENVIRONMENTAL DOSIMETRY DATA 50,---------------------------------------------~

45 40 35 30 25 20 15 10 5

PRE-OP Unit 1 Criticality 09/10/1982 OPERATIONAL Unit2 Criticality Changed from TLD 05/08/1984 to OSLD system

/

01/18/12 \\

0+--~------------~---~------------,--,'-_________

1973 1975 1977 1979 19811983 1985 1987 1989 19911993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 2017 2019 2021 2023

-Indicator

-Control C-22

FIGURE C IODINE-131 ACTIVITY IN MILK pCi/L 100 A

90 PRE-OP OPERATIONAL CHINESE 80 WEAPONS TEST A- 09/12/77 B - 03/14/78 70 C - 10/15/80 60 50 40 CHERNOBYL 4/26/86 30 -

I

).

Unit 1

>(

20 Criticality y'

Unit2

>(

10 0

09/10/1982 Criticality

~(

\\

~(

05/08/1984..,

)

l j

~'-.

B r<

C

~

(

~ -

[:,{

1':'Jlndicator Control C-23

FIGURE C ANNUAL AVERAGE TRITIUM ACTIVITY IN PRECIPITATION AND SURFACE WATER VERSUS GROUND WATER 1200 ~---------------------------------~

1100 1000

_ Condition Report Threshold (surface/groundwater sample result) ___________ _

900 800 700 600 500 400 300 200 100 0

.Minimum Detectable Concentration

-100 ~---------------------------------~

pCi/L

-~~

~~

~';,

~;t:,,.

~':,

~;~

~~

~

~~

"'~

~~

. -~~

~

\\,;~

V

~

'\\,'<,

-2007

-2008

-2009

-2010

~

-2011

-2012 2013

-2014

-2015

'i,:10~\\T,!1'~ 2 0 16

-2011 2018 2019 2020

-2021 2022 2023 Investigation Level

--MDC C-24

pCi/L FIGURE C GROSS BETA ACTIVITY IN DRINKING WATER 10 -,--------.---------------------------------------,

9 8

7 6

5 4

3 2

1 PRE-OP Unit 1 Criticality 09/10/1982 OPERATIONAL Unit2

/

Criticality Ji' 05/08/1984 0--------,---__________________________

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~

~!

~ ~ ~ ~ ~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

C-25

FIGURE C TRITIUM ACTIVITY IN SURFACE WATER pCi/L 3500,-------------c,-------------------------------------,

2500 1500 500 PRE-OP Criticality 09/10/1982 OPERATIONAL Unit2 Criticality 05/08/1984

-500 +----,~~~~~~~0-,---,-----'-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~;----r A"v A~

A~

Aq,

'Eb~

'Eb"v

~ 'Eb~

'Eb%

?i~

?i"v

?i~

?iq,

~~ ~"v

~~

~~ ~%

~ ~"v

~ ~~ ~ -:,,~

-:,,"v

~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Indicator

-Control C-26

APPENDIX D

SUMMARY

OF RESULTS FROM ANALYTICS, ENVIRONMENTAL RESOURCE ASSOCIATES (ERA),

AND DEPARTMENT OF ENERGY (DOE) - MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

D-1

Table D-1 Analytics Environmental Radioactivity Cross Check Program Teled;r:ne Brown Engineering Environmental Services Identification TBE Known Ratio of TSE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation (b)

Value March 2023 E13826 Milk Sr-89 pCi/L 70.5 93.1 0.76 w

Sr-90 pCi/L 12.3 14.7 0.84 A

E13827 Milk Ce-141 pCi/L 127 139 0.91 A

Co-58 pCi/L 119 131 0.91 A

Co-60 pCi/L 250 279 0.90 A

Cr-51 pCi/L 246 302 0.82 A

Cs-134 pCi/L 172 200 0.86 A

Cs-137 pCi/L 125 140 0.89 A

Fe-59 pCi/L 122 122 1.00 A

1-131 pCi/L 70.2 82.0 0.86 A

Mn-54 pCi/L 165 180 0.92 A

Zn-65 pCi/L 306 306 1.00 A

E13828 Charcoal 1-131 pCi 79.0 89.9 0.88 A

E13829 AP Ce-141 pCi 91.9 87.8 1.05 A

Co-58 pCi 87.5 82.5 1.06 A

Co-60 pCi 199 176 1.13 A

Cr-51 pCi 218 191 1.14 A

Cs-134 pCi 119 126 0.94 A

Cs-137 pCi 92.4 88.7 1.04 A

Fe-59 pCi 95.5 76.9 1.24 w

Mn-54 pCi 120 113 1.06 A

Zn-65 pCi 179 193 0.93 A

E13830 Soil Ce-141 pCi/g 0.224 0.220 1.02 A

Co-58 pCi/g 0.193 0.207 0.93 A

Co-60 pCi/g 0.406 0.441 0.92 A

Cr-51 pCi/g 0.464 0.477 0.97 A

Cs-134 pCi/g 0.334 0.316 1 06 A

Cs-137 pCi/g 0.270 0.288 0.94 A

Fe-59 pCi/g 0.183 0.193 0.95 A

Mn-54 pCi/g 0.263 0.284 0.93 A

Zn-65 pCi/g 0.475 0.484 0.98 A

E13831 AP Sr-89 pCi 99.4 90.8 1.09 A

Sr-90 pCi 14.6 14.3 1.02 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning-reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1. 30 D-2 (Page 1 of 4)

Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledlne Brown En9ineerin9 Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation (bl Value September 2023 E13832 Milk Sr-89 pCi/L 49.8 71.4 0.70 w

Sr-90 pCi/L 7.28 12.8 0.57 N(1l E13833 Milk Ce-141 pCi/L 93.4 104 0.90 A

Co-58 pCi/L 58.2 65.8 0.88 A

Co-60 pCi/L 190 223 0.85 A

Cr-51 pCi/L 207 205 1.01 A

Cs-134 pCi/L 96.0 114 0.84 A

Cs-137 pCi/L 121 141 0.86 A

Fe-59 pCi/L 78.8 78.8 1.00 A

1-131 pCi/L 27.9 37.4 0.75 w

Mn-54 pCi/L 128 146 0.88 A

Zn-65 pCi/L 185 203 0.91 A

E13834 Charcoal 1-131 pCi 76.9 78.7 0.98 A

E13835 AP Ce-141 pCi 91.9 87.1 1.05 A

Co-58 pCi 58.7 55.2 1.06 A

Co-60 pCi 200 187 1.07 A

Cr-51 pCi 192 172 1.12 A

Cs-134 pCi 89.6 96 0.94 A

Cs-137 pCi 109 119 0.92 A

Fe-59 pCi 68.3 66.1 1.03 A

Mn-54 pCi 129 123 1.05 A

Zn-65 pCi 163 171 0.96 A

E13836 Soil Ce-141 pCi/g 0.228 0.184 1.24 w

Co-58 pCi/g 0.103 0.116 0.89 A

Co-60 pCi/g 0.364 0.394 0.92 A

Cr-51 pCi/g 0.371 0.362 1.02 A

Cs-134 pCi/g 0.176 0.202 0.87 A

Cs-137 pCi/g 0.285 0.315 0.90 A

Fe-59 pCi/g 0.140 0.139 1.00 A

Mn-54 pCi/g 0.237 0.259 0.92 A

Zn-65 pCi/g 0.349 0.359 0.97 A

E13837 AP Sr-89 pCi 74.6 80.2 0.93 A

Sr-90 pCi 13.9 14.4 0.96 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning-reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) See NCR 23-24 D-3 (Page 2 of 4)

Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineerin~ Environmental Services Identification TSE Known Acceptance Month/Year Number Matrix Nuclide Units Reported Value (a)

Range Evaluation (b)

Value February 2023 23-MaS48 Soil Ni-63 Sq/kg 294 1130 791-1469 N(3) 23-MaSU48 Urine Cs-134 Sq/L 9.92 10 6.7-12.4 A

Cs-137 Sq/L 0.0994 (1)

A Co-57 Sq/L 9.35 8.67 6.07 - 11.27 A

Co-60 Sq/L 9.03 8.13 5.69 - 10.57 A

Mn-54 Sq/L 11.80 10.0 7.0-13.0 A

U-234 Sq/L 0.01 Not spiked U-238 Sq/L 0.01 Not spiked Zn-65 Sq/L 10.60 9.29 6.50- 12.08 A

23-MaW48 Water Ni-63 Sq/L 23.1 27.3 19.1-35.5 A

23-RdV48 Vegetation Cs-134 Sq/sample 5.6 7.6 5.32 - 9.88 w

Cs-137 Sq/sample 0.03 (1)

A Co-57 Sq/sample 5.9 6.9 4.85 - 9.01 A

Co-60 Sq/sample 5.00 6.51 4.56 - 8.46 w

Mn-54 Sq/sample 6.08 8.03 5.62 - 10.44 w

Sr-90 Sq/sample 0.05 (1)

N(4J Zn-65 Sq/sample 5.49 7.43 5.20- 9.66 w

August2023 23-MaS49 Soil Fe-55 Sq/kg 346 1280 896 - 1664 N(5)

Ni-63 Sq/kg 1260 1370 959-1781 A

23-MaW49 Water Ni-63 Sq/L 1.0 (2)

A 23-RdV49 Vegetation Cs-134 Sq/sample 3.860 4.98 3.49 - 6.47 w

Cs-137 Sq/sample 0.027 (1)

A Co-57 Sq/sample 3.88 4.24 2.97 - 5.51 A

Co-60 Sq/sample 2.37 2.79 1.95 - 3.63 A

Mn-54 Sq/sample 2.04 2.56 1.79-3.33 w

Sr-90 Sq/sample 0.96 1.17 0.82 - 1.52 A

Zn-65 Sq/sample

-0.514 (1)

A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) False positive test (2) Sensitivity evaluation (3) See NCR 23-08 (4) See NCR 23-09 (5) Initial evaluation - See CAR 23-31 D-4 (Page 3 of 4)

Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Month/Year Identification Matrix TBE Reported Known Acceptance Evaluation (bl Number Nuclide Units Value Value (a)

Limits March 2023 MRAD-38 Water Am-241 pCi/L 28.1 32.1 220-41.0 A

Fe-55 pCi/L 1180 1380 811 - 2010 A

Pu-238 pCi/L 65.6 70.7 42.5 - 91.6 A

Pu-239 pCi/L 82.9 92.4 57.2 - 114 A

Soil Sr-90 pCi/kg 2630 2580 803 - 4020 A

AP GR-A pCi/filter 69.6 76.8 40.1 - 127 A

GR-B pCi/filter 36.8 32.8 19.9 - 49.6 A

April 2023 RAD-133 Water Ba-133 pCi/L 26.0 22.3 17.1 -25.8 Nc1J Cs-134 pCi/L 72.1 77.6 63.4 - 85.4 A

Cs-137 pCi/L 62.1 63.1 56.8 - 72.2 A

Co-60 pCi/L 32.6 30.3 26.7-36.1 A

Zn-65 pCi/L 253 242 218 - 283 A

GR-A pCi/L 34.2 29.2 14.9 - 38.2 A

GR-B pCi/L 64.3 60.7 41.8-67.4 A

U-Nat pCi/L 61.75 62.7 51.2 - 69.0 A

H-3 pCi/L 13,300 12700 11,100-14,000 A

Sr-89 pCi/L 67.0 61.1 49.2 - 69.0 A

Sr-90 pCi/L 36.5 36.0 26.4-41.5 A

1-131 pCi/L 24.3 28.7 23.9 - 33.6 A

September 2023 MRAD-39 Water Am-241 pCi/L 54.0 71.0 48.7 - 90.8 A

Fe-55 pCi/L 2430 2630 1550 - 3830 A

Pu-238 pCi/L 172 177 106 - 229 A

Pu-239 pCi/L 171 182 113 - 224 A

Soil Sr-90 pCi/kg 9580 6800 2120 - 10,600 A

AP GR-A pCi/filter 82.2 79.8 41.7-131 A

GR-B pCi/filter 54.3 42.6 25.8 - 64.4 A

October 2023 RAD-135 Water Ba-133 pCi/L 86.3 92.2 73.8 - 111 A

Cs-134 pCi/L 38.4 41.2 27.9-54.5 A

Cs-137 pCi/L 194 199 161-237 A

Co-60 pCi/L 49.5 47.8 33.8 - 61.8 A

Zn-65 pCi/L 59.7 57.0 23.7 - 90.3 A

GR-A pCi/L 53.2 70.6 54.0 - 87.2 Nc2J GR-B pCi/L 46.9 42.2 30.5 - 53.9 A

U-Nat pCi/L 51.26 51.7 45.9-57.5 A

H-3 pCi/L 20,100 22,900 19,700-26,100 A

Sr-89 pCi/L 51.1 38.2 25.2 - 51.2 A

Sr-90 pCi/L 31.7 35.7 30.3-41.1 A

1-131 pCi/L 23.5 29.7 25.8 - 33.6 N(3J (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 23-10 (2) See NCR 23-20 (3) See NCR 23-21 D-5 (Page 4 of 4)

APPENDIX E REMP SAMPLE EQUIPMENT OPERABILITY TRENDING E-1

TABLE E-1 REMP SAMPLING EQUIPMENT OPERABILITY TRENDING SUSQUEHANNA STEAM ELECTRIC STATION Percent(%) Operability SAMPLING MEDIA SAMPLE LOCATION DESCRIPTION 2013 2014 2015 2016 2017 2018 Air Particulate 3S2 SSES Backup Met. Tower 99.9 100 99 100 99.9 99.9

& Charcoal 12S1 West Building 99.9 100 100 100 99.1 99.7 Former Laydown Area, West of 13S6 Confers Lane 99.9 100 97 100 100 99.9 12E1 Berwick Hospital 100.0 100 98 99.1 100 100 6G1 Freeland Substation 99.9 100 90*

100 100 100 PPL System Facilities Center, 8G1 Humboldt Industrial Park 99.9 100 100 99.2 99.9 99.9 E of Confers Lane, 10S3 S of Towers Club 100 99.5 99.9 Transmission Line, 9B1 E of Route 11 100 99.9 99.9 Drinking Water 12H2 Danville Waler Company 100.0 100 100 100 100 100 Surface Water Cooling Tower Slowdown 2S7 Discharge Line 98.1 69'*

100 99.1 100 100 6S6 River Water Intake Line 93.2 93 98 99.7 99.9 99.9

Planned power outage by Electric Utilities

- Auto-Compsite sampler problems, March through June. New Auto-Compsite sampler installed in July.

- - Auto-Compsite sampler taken OOS 8/30/20. New Auto-Compsite sampler installed, placed in service 10/13/20.

E-2 2019 2020 2021 2022 2023 100.0 99.4 99.9 95.5 99.7 99.9 99.9 99.9 99.7 98.1 99.9 99.9 99.9 99.9 100.0 100 100.0 100 100 100 No longer No longer No longer No longer No longer in service in service in service in service in service 99.9 99.9 99.9 100 100 99.2 98.9 99.9 99.7 99.9 99.9 100.0 99.9 99.9 99.9 98.1 100.0 100 100.0 100.0 No longer No longer 99.9 99.9 93.0 in service in service 99.9 88.1 ***

94.0 99.4 94.0

PLA-8122, Annual Radiological Environmental Operating Report (PLA-8122)

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