Text

Annual Radiological Environmental Operating Report (PLA-8174)
	ML25112A088
Person / Time
Site:	Susquehanna
Issue date:	04/22/2025
From:	Casulli E; Susquehanna, Talen Energy
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	PLA-8174
	Download: ML25112A088 (1)
	v • d • e

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

April 22, 2025 Attn: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 SUSQUEHANNA STEAM ELECTRIC STATION ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT PLA-8174 ENERGY 10 CFR 50.4 Docket No. 50-387 50-388 In accordance with the Susquehanna Steam Electric Station (SSES) Units 1 and 2 Technical Specification 5.6.2, the SSES Annual Radiological Environmental Operating Report is hereby submitted for the 2024 calendar year.

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:

2024 Annual Radiological Environmental Operating Repmi Copy:

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-8174 2024 Annual Radiological Environmental Operating Report

SUSQUEHANNA STEAM ELECTRIC STATION UNITS 1 and 2 Annual Radiological Enviromnental Operating Report 2024 Prepared by:

Francis. J. Hfckey, Sr. Rea.Ith Physicist 7 Reviewed by:

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

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4/10/25 Beth Ann Sooy, Manager - Plant Chemistry/ Environmental Susquehanna Nuclear, LLC 769 Salem Boulevard Berwick, Pennsylvania 18603

SUSQUEHANNA STEAM ELECTRIC STATION Units 1 & 2 2024 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT JANUARY 1 TO DECEMBER 31, 2024 Susquehanna Nuclear, LLC Berwick, PA April, 2024

-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............................................................................................... 26 A. Atmospheric....................................................................................................... 26

1. Air Particulates........................................................................................ 26

2. Air Iodine............................................................................................... 28 B. Direct Radiation................................................................................................. 28 C. Terrestrial.......................................................................................................... 30

1. Milk......................................................................................................... 30

2. Groundwater........................................................................................... 31

3. Drinking Water........................................................................................ 33

4. Food Products......................................................................................... 34 D. Aquatic.............................................................................................................. 35

1. Surface Water......................................................................................... 35

2. Fish......................................................................................................... 36

3. Shoreline Sediment................................................................................. 37 E. Land Use Census.............................................................................................. 39 V. Annotations to Previous AREOR.................................................................................. 40 VI. Conclusions................................................................................................................. 40 VII. References................................................................................................................. 41

-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 2024 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 Gross Beta, 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-6 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 2024. Teledyne Brown Engineering (TBE) was responsible for the analysis of environmental samples during 2024. The results are discussed in this report. Landauer provided the dosimetry services for SSES during 2024.

This Annual Radiological Environmental Operating Report (AREOR) conducted for SSES covers the period January 1, 2024 through December 31, 2024. During that time period,1344 analyses were performed on 1144 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 2024 Radioactive Effluent Monitoring and Control program, approximately 18 Curies of H-3 were discharged in liquid radwaste releases to the Susquehanna River and approximately 142 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 2024. The 2024 average dilution factor for the Susquehanna River was 646, based on the annual average river flow of 7.50E+06 gpm and the annual average cooling tower blowdown flow of 1.16E+04 gpm.

H-3 was identified above analysis detection levels in precipitation samples taken on-site during 2024. Precipitation is analyzed to assess the impact of airborne effluent H-3 on groundwater activities.

Low levels of H-3 were identified in on-site groundwater samples during 2024. Assuming a Member of the Public was consuming water with the highest detected concentration of H-3 of an onsite monitoring well sample, the theoretical dose to the total body and maximum organ using the H-3 concentration of 372 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 2024 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 2024 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 detected were consistent with those detected in previous years. Naturally occurring K-40 and thorium-228 (Th-228) were detected at levels consistent with those detected in previous years. No fission or activation products were detected.

Drinking water samples were analyzed for concentrations of tritium, gross beta and gamma emitting nuclides. Tritium activities were not detected above the minimum detectable concentration. Gross beta activities detected were consistent with those detected in previous years. Naturally occurring K-40 was detected at levels 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, gross beta and gamma emitting nuclides. Tritium activities were not detected above the minimum detectable concentration. Low level gross beta activities detected were as expected for environmental surface water samples.

Naturally occurring K-40 was detected at levels consistent with those detected in previous years. 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 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. 310 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.

Sq\\lrces c;,f ~adia_t,<:>p.E_xposure in the U.S.

Cosmic (Space) - 5%

Terrestrial (Soil) - 3%

lntemal - 5%

D Natural Sources - 50%

~310 millirern {9:31 rem)

Source: NCRP Report No. 160 (2009)

Industrial and Occupational

<0.1%

Consurrier - 2%

Manmade Sources - 50%

-~310 millirem (0.31 *rem)

Full report is available on the NCRP websiteatwww,NCRPonline,org 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, 2024, 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 1.2 E-03 Fe-59 7.9 E-03 Co-58 1.9 E-03 Co-60 1.2 E-03 Zn-65 2.9 E-03 Cs-134 1.1 E-03 Cs-137 1.0 E-03 I-131 4.2 E-01 Waterborne REMP Typical MDCs Radionuclide MDC (pCi/L.)

H-3 (DIST) 3.6 E+02 Mn-54 4.0 E+00 Fe-59 1.1 E+01 Co-58 4.1 E+00 Co-60 4.4 E+00 Zn-65 8.5 E+00 Cs-134 3.9 E+00 Cs-137 4.1 E+00 I-131 9.9 E+00 H-3 3.5 E+02 Gross Beta 2.1 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 2024 REMP Atypical Sampling Occurrences C.

Program Changes In 2024, Direct Radiation Monitoring location 11A1 was added to the REMP. Gross beta analysis of Surface water control samples was initiated in the 2nd quarter of 2024 to coincide with an update to the SSES Technical Requirements Manual (TRM).

2024 REMP Atypical Sampling Occurrences Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action JAN Air 8G1 01/23/24 to 01/31/24, 01/31/24 to 02/07/24, and 02/07/24 to 02/14/24 Power outage began on 01/27/24 @ 0437 hours0.00506 days 0.121 hours 7.225529e-4 weeks 1.662785e-4 months .

Outage due to electrical work performed in the area. PPL unable to access source of power loss problem underground due to freezing temps. Loss of 103.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , as determined by timer box.

No sample for sampling period 01/31/24 to 02/07/24 due to lack of power to sampling unit.

Non-continuous sampler operation.

CA #24-02 CR 2024-01776 02/09/24: PPL installed heavy duty power cord and restored power to sampler @ 1204 hours0.0139 days 0.334 hours 0.00199 weeks 4.58122e-4 months .

02/09/24: Operability verified @ 1456 hours0.0169 days 0.404 hours 0.00241 weeks 5.54008e-4 months .

07/03/24: Permanent power restored to sampler

@ 1217 hours0.0141 days 0.338 hours 0.00201 weeks 4.630685e-4 months .

Less than ideal sample collected for sample period 01/23/24 to 01/31/24: 12,300 cf.

Ideal sample collected for sample period 02/09/24 to 02/14/24: 16,200 cf.

FEB Air 10S3 02/07/24 to 02/14/24 Power outage-date and time unknown.

Loss of 6.0 hours0 days 0 hours 0 weeks 0 months , as determined by timer box during weekly collection.

Non-continuous sampler operation.

CA #24-03 CR 2024-02500 02/14/24: No action required. Air monitor resumed normal operation when power was restored.

02/14/24: Operability verified @ 1003 hours0.0116 days 0.279 hours 0.00166 weeks 3.816415e-4 months .

Ideal sample collected for sample period:

20,300 cf.

Air 9B1 02/07/24 to 02/14/24 Diminished flow rate upon arrival (1.9 cfm), below the procedural range of 2.0-2.4 cfm.

Continuous sampling during sample period.

CA #24-04 CR 2024-02501 02/14/24: Flow rate adjusted to within procedural range (2.2 cfm).

02/14/24: Operability verified @ 1046 hours0.0121 days 0.291 hours 0.00173 weeks 3.98003e-4 months .

Ideal sample collected for sample period:

21,000 cf.

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action FEB (cont.)

Drinking Water 12H2 02/20/24 to 02/27/24 (week 4 February composite)

Composite sampler at Danville Water Company turned off on 02/27/24 @ 0953 hours0.011 days 0.265 hours 0.00158 weeks 3.626165e-4 months for maintenance on wells.

Week 4 composite sample was used in February composite with known stop date and time.

CA #24-05 CR 2024-03059 02/27/24: Sampler returned to service @ 1317 hours0.0152 days 0.366 hours 0.00218 weeks 5.011185e-4 months (week 1 March start).

02/27/24: Operability verified @ 1345 hours0.0156 days 0.374 hours 0.00222 weeks 5.117725e-4 months .

Ideal sample collected for week 4 sample period.

MAR Air 12E1 03/20/24 to 03/27/24 Power outage-date and time unknown.

Loss of 1.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months , as determined by timer box during weekly collection.

Non-continuous sampler operation.

CA #24-06 CR 2024-04625 03/27/24: No action required. Air monitor resumed normal operation when power was restored.

03/27/24: Operability verified @ 1016 hours0.0118 days 0.282 hours 0.00168 weeks 3.86588e-4 months .

Ideal sample collected for sample period:

22,200 cf.

JUN Air 12S1 05/29/24 to 06/05/24 (Loss of 12kV power)

Loss of power on 06/01/24.

Loss of 15.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , as determined by timer box.

Non-continuous sampler operation.

CA #24-07 CR 2024-08883 06/02/24: Air monitor resumed normal operation when power was restored.

06/02/24: Operability verified @ 1647 hours0.0191 days 0.458 hours 0.00272 weeks 6.266835e-4 months .

Ideal sample collected for sample period:

19,500 cf.

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action JUN (cont.)

Surface Water 6S6 06/04/24 to 06/11/24 (week 2 June composite)

ACS plastic dosing chamber found disconnected from dosing chamber flange during week 2 June collection.

Week 2 composite sample with unknown stop date and time was used in June composite.

CA #24-08 CR 2024-09354 06/11/24: Reattached dosing chamber flange.

06/11/24: Sampler restored to service @ 1200 hours0.0139 days 0.333 hours 0.00198 weeks 4.566e-4 months .

06/11/24: Grab sample collected @ 5S9 @ 1230 hours0.0142 days 0.342 hours 0.00203 weeks 4.68015e-4 months for comparative analysis.

Ideal sample volume collected for week 2 June composite.

Air 12S1 06/18/24 to 06/26/24 (momentary loss of 12kV power)

Momentary loss of power on 06/22/24 @ 1730 hours0.02 days 0.481 hours 0.00286 weeks 6.58265e-4 months . No loss of sampling time as determined by timer box.

Non-continuous sampler operation.

CA #24-09 CR 2024-09738 06/22/24: No action required. Air monitor resumed normal operation when power was restored.

06/23/24: Operability verified @ 0927 hours0.0107 days 0.258 hours 0.00153 weeks 3.527235e-4 months .

Ideal sample collected for sample period:

23,800 cf.

Air 12S1 06/26/24 to 07/03/24 (loss of 12kV power)

Power outage on 06/26/24 @ 1800 hours0.0208 days 0.5 hours 0.00298 weeks 6.849e-4 months .

Loss of 120.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months for sampling period, as determined by timer box.

Non-continuous sampler operation.

CA #24-10 CR 2024-09959 07/01/24: Air monitor resumed normal operation when power was restored at approximately 0911 hours0.0105 days 0.253 hours 0.00151 weeks 3.466355e-4 months .

07/01/24: Operability verified @ 1035 hours0.012 days 0.288 hours 0.00171 weeks 3.938175e-4 months .

Less than ideal sample collected for sample period: 7,700 cf.

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action JUN (cont.)

Air

13S6, 10S3, 12E1 06/26/24 to 07/03/24 Power outages from storm began at approx.

1800 hours0.0208 days 0.5 hours 0.00298 weeks 6.849e-4 months on 06/26/24 at 13S6 and 10S3.

Loss of 28.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months at 13S6, loss of 120.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months at 10S3, and 8.0 hours0 days 0 hours 0 weeks 0 months at 12E1, as determined by timer boxes during weekly collection.

Non-continuous sampler operation.

CA #24-11 CR 2024-09997 06/27/24: Air monitor 12E1 resumed normal operation when power was restored. Operability verified @ 1016 hours0.0118 days 0.282 hours 0.00168 weeks 3.86588e-4 months for 12E1.

07/01/24: Air monitor 13S6 resumed normal operation when power was restored. Operability verified @ 1031 hours0.0119 days 0.286 hours 0.0017 weeks 3.922955e-4 months for 13S6.

07/03/24: Air monitor 10S3 resumed normal operation when power was restored. Operability verified @ 1011 hours0.0117 days 0.281 hours 0.00167 weeks 3.846855e-4 months for 10S3.

Ideal samples collected for sample period:

20,200 cf (12E1), and 18,300 cf (13S6)

Less than ideal sample collected for sample period: 6,000 cf (10S3).

JUL Air

3S2, 9B1 06/26/24 to 07/03/24 Power outages-dates and times unknown.

Loss of 0.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months , as determined by timer boxes during weekly collection.

Non-continuous sampler operation.

CA #24-12 CR 2024-10275 07/03/24: No action required. Air monitors resumed normal operation when power was restored.

07/03/24: Operability verified @ 0950 hours0.011 days 0.264 hours 0.00157 weeks 3.61475e-4 months for 3S2, and 1024 hours0.0119 days 0.284 hours 0.00169 weeks 3.89632e-4 months for 9B1.

Ideal samples collected for sample period:

21,500 cf (3S2) and 21,400 cf (9B1).

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action JUL (cont.)

Surface Water 6S6 07/02/24 to 07/09/24 (week 2 July composite)

Less than normal sample volume and diminished flow rate at ACS during week 2 July collection.

Continuous sampler operation.

CA #24-13 CR 2024-10468 07/09/24: Request I&C/FIN perform maintenance ASAP.

07/09/24: Grab sample collected @ 5S9 @

1255 hours0.0145 days 0.349 hours 0.00208 weeks 4.775275e-4 months .

07/11/24: I&C performed maintenance and restored sampler to service @ 1055 hours0.0122 days 0.293 hours 0.00174 weeks 4.014275e-4 months .

07/11/24: Operability verified @ 1300 hours0.015 days 0.361 hours 0.00215 weeks 4.9465e-4 months .

Ideal sample volume collected for week 2 July.

AUG Air 12S1 08/07/24 to 08/14/24 (momentary loss of 12kV power)

Momentary loss of power on 08/07/24 @ 2251 hours0.0261 days 0.625 hours 0.00372 weeks 8.565055e-4 months . No loss of sampling time as determined by timer box.

Non-continuous sampler operation.

CA #24-14 CR 2024-11840 08/07/24: No action required. Air monitor resumed normal operation when power was restored.

08/08/24: Operability verified @ 0831 hours0.00962 days 0.231 hours 0.00137 weeks 3.161955e-4 months .

Ideal sample collected for sample period:

22,900 cf.

Air 10S3 08/14/24 to 08/20/24 Pump providing inadequate flow rate upon arrival

(<0.1 cfm), below the procedural range of 2.0-2.4 cfm. Adequate flow could not be achieved with maximum flow settings.

Continuous sampling during sample period.

CA #24-15 CR 2024-12303 08/20/24: Pump was replaced, and air flow restored to within procedural range.

08/20/24: Operability verified @ 1034 hours0.012 days 0.287 hours 0.00171 weeks 3.93437e-4 months .

Ideal sample collected for sample period:

17,400 cf.

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action SEP Air 3S2 08/28/24 to 09/04/24 Blank/unused charcoal cartridge shipped to analytical vendor on 09/04/24 instead of cartridge that was in the field for sampling period 08/28/24 to 09/04/24. Incorrect exchange was discovered while performing a verification of cartridges before field deployment on 09/11/24.

No effect on analysis of sample.

CA #24-16 CR 2024-13405 09/11/24: Chemistry support notified. Analytical vendor verified incorrect 3S2 charcoal cartridge was shipped on 09/04/24.

09/12/24: 3S2 charcoal cartridge filter that was in the field for sampling period 08/28/24 to 09/04/24 was shipped to analytical vendor to be analyzed. LLD for I-131 was met within this timeframe.

Sample collected for sample period:

20,900 cf.

Air 12S1 09/17/24 to 09/24/24 (loss of 12kV power)

Power outage beginning on 09/21/24.

Loss of 33.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months for sampling period, as determined by timer box.

Non-continuous sampler operation.

CA #24-17 CR 2024-13773 09/22/24: Air monitor resumed normal operation when power was restored at approximately 1440 hours0.0167 days 0.4 hours 0.00238 weeks 5.4792e-4 months .

09/22/24: Operability verified @ 1738 hours0.0201 days 0.483 hours 0.00287 weeks 6.61309e-4 months .

Ideal sample collected for sample period:

19,200 cf.

OCT Surface Water 6S6 09/24/24 to 09/30/24 (week 1 October composite)

ACS plastic dosing chamber found disconnected from dosing chamber flange during week 1 October collection.

Week 1 composite sample with unknown stop date and time was used in October composite.

CA #24-18 CR 2024-14097 09/30/24: Reattached dosing chamber flange.

09/30/24: Sampler restored to service @ 1130 hours0.0131 days 0.314 hours 0.00187 weeks 4.29965e-4 months .

09/30/24: Grab sample collected @ 5S9 @

1200 hours0.0139 days 0.333 hours 0.00198 weeks 4.566e-4 months for comparative analysis.

Ideal sample volume collected for week 1 October composite.

2024 REMP Atypical Sampling Occurrences (continued)

Date Sample Type Location Code(s)

Sample Period Reason for Occurrence(s)

Corrective Action 4th Q Direct Radiation 6E1 4th Quarter 2024 Environmental dosimeters were missing at REMP location 6E1 during the 4th quarter exchange.

CR 2025-00656 01/09/25: 1st quarter 2025 dosimeters installed at sampling location.

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 Teledyne Brown Engineering Environmental Services (TBE-ES) laboratory analyzed Performance Evaluation (PE) samples of air particulate (AP), milk, soil, vegetation, and water matrices that represent test and matrix combinations available for REMP programs.

The PE samples supplied by Eckert & Ziegler (E&Z) 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. E&Z Analytics Evaluation Criteria Analytics evaluation report provides a ratio of TBEs result and E&Z Analytics known value. Since flag values are not assigned by E&Z 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 US EPA, 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 always resemble typical environmental samples obtained at commercial nuclear power facilities.

Teledyne Brown Engineering For the TBE laboratory, 152 out of 167 analyses performed met the specified acceptance criteria. Fifteen analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:

1. NCR 24-02: ERA March MRAD-40 study with Air Particulate AM-241 evaluated as Not Acceptable. TBE reported 38.8 pCi/filter and the known value returned at 55.0 pCi/filter (range 39.3-73.3). The root cause investigation determined that the sample was not logged into the system correctly and therefore not prepared with the required tracer. To correct and prevent recurrence, personnel involved are to utilize a template to ensure all analyses are logged as required and the QA Manager will perform sample log review as a back up to ensure accuracy. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.

2. NCR 24-03: ERA March MRAD-40 air particulate study GR-B evaluated as Not Acceptable. TBE reported 42.1 pCi/filter and the known value returned at 22.2 pCi/filter (range 13.5-33.5). The root cause investigation determined that alpha-to-beta crosstalk was more significant than normal which caused the beta activity to report falsely high data. To correct and prevent recurrence, personnel involved are to adjust the alpha-to-beta crosstalk via correction calculation measures when high alpha activities are observed. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.

3. NCR 24-05: ERA April RAD-137 water study GR-A evaluated as Not Acceptable. TBE reported 35.2 pCi/L and the known value returned at 52.6 pCi/L (range 39.6-65.6). The root cause investigation determined that the provided samples contained a solids content that was significantly higher than the typical client samples tested by the laboratory. A set aliquot volume for prior ERA samples was used and not adjusted to account for the sudden increase in solid content. To correct and prevent recurrence, new sample types were ordered from ERA that used Am-231 to better reflect client sample testing and acceptable results were achieved. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.

4. NCR 24-06: E&Z Analytics March E14092 air particulate study Co-60 evaluated as Not Acceptable. TBE reported 168 pCi and the known value returned at 126 pCi. Additionally, March E14093 soil Ce-141 evaluated as Not Acceptable. TBE reported 0.106 pCi/g and the known value returned at 0.071pCi/g. The root cause investigation was unable to determine any anomaly thus no proposed corrective action. No recurrence has occurred.

5. CAR 24-02 (CAR 23-31): MAPEP February 24-MaS50 soil study Fe-55 evaluated as Not Acceptable. TBE reported 297 Bq/Kg and the known value returned at 650 Bq/Kg (range 455-845). The root cause investigation suspects that the current analytical procedure is not sufficient to add the interferences added to the sample by MAPEP. This investigation is still ongoing (See NCR 24-16) as the suggested corrective action did not provide desired results.

6. NCR 24-08: MAPEP February 24-MaS50 soil study Ni-63 evaluated as Not Acceptable. TBE reported 1070 Bq/Kg and the known value returned at 1530 Bq/Kg (range 1071-1989). The root cause investigation suspected that the sample contained added interferences that are not typically seen in client samples. All QC efforts associated with the sample were acceptable and no anomalies found, even after reanalysis. To correct and prevent recurrence, samples suspected of additional interferences will include the addition of Ni-59 tracer to determine yield results when calculating results. TBE analytical procedure TBE-2013 was updated to include this change.

7. NCR 24-09: MAPEP February 24-MaSU50 urine study Zn-65 evaluated as Not Acceptable. The root cause investigation determined that the sample was spiked lower than TBEs typical detection limit and client requirements. The report was revised by MAPEP indicating Not Evaluated, resulting in this nuclide to not be considered a failure.

8. NCR 24-10: MAPEP February 24-MaW50 water study Tc-99 evaluated as Not Acceptable. TBE reported 9.95 Bq/L and the known value returned 7.47 Bq/L (range 5.23-9.71). The root cause investigation suspects Thorium interference that was not removed during the column separation process of the analytical procedure; however, it cannot be confirmed as all QC efforts associated with the sample were acceptable and with no anomalies found. To potentially correct and prevent recurrence, an additional rinse step was added to the procedure. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.

9. NCR 24-11: MAPEP February 24-RdV50 vegetation study Sr-90 evaluated as Not Acceptable. TBE reported 0.276 Bq/sample and the known value returned 0.529 Bq/sample (range 0.370-0.688). The root cause investigation determined a laboratory accident resulting in a spilled (loss) of sample. No corrective action was performed as the cause was an unintentional sample spill.

10. NCR 24-14: ERA September MRAD-41 air particulate study U-234/238 evaluated as Not Acceptable. TBE reported 14.0/14.2 pCi/filter and the known value returned at 31.1/30.9 pCi/filter (range 23.1-36.9). The root cause investigation determined that the laboratory technician placed double the amount of tracer in the sample by error. To correct and prevent recurrence, samples that have been digested/leached with carrier/tracer added will have a label placed over the cap indicating it has already been added. Additionally, the beaker that aliquot is put in should have markings to indicate carrier/tracer has already been added to the sample.

11. NCR 24-15: ERA September MRAD-41 water study Fe-55 evaluated as Not Acceptable. TBE reported 615 pCi/L and the known value returned at 1230 pCi/L (range 723-1790). The root cause is still under investigation.

12. NCR 24-16: MAPEP August 24-MaS51 soil study Fe-55 evaluated as Not Acceptable. TBE did not report a value and the known value returned 780 Bq/Kg (range 546-1014). The root cause is still under investigation.

13. NCR 24-17: MAPEP August 24-RdV51 vegetation study Sr-90 evaluated as Not Acceptable. TBE reported 0.95 Bq/sample and the known value returned 2.39 Bq/sample (range 1.67-3.11). The root cause is still under investigation.

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 2024 REMP samples are divided into categories based on exposure pathways: atmospheric, direct radiation, terrestrial, and aquatic. The analytical results for the 2024 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 312 of 312 of the indicator location samples at concentrations ranging from 6 to 25 E-3 pCi/m3 with an average concentration of 14 E-3 pCi/m3, and in 51 of 51 of the control location samples at concentrations ranging from 6 to 21 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 48 E-3 to 133 E-3 pCi/m3 with an average concentration of 82 E-3 pCi/m3, and in the four control location composites ranging in concentration from 54 to 89 E-3 pCi/m3 with an average concentration of 74 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 60 locations were monitored for direct radiation during 2024, including 35 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 16.9 milliroentgen per standard quarter. The annual average dose rate for the control locations was 13.7 milliroentgen per standard quarter. The preoperational average for the quarterly direct radiation readings was 17.6 milliroentgen per standard quarter.

In 2024, the maximum direct radiation dose to a member of the public calculated using the methodology in EC-ENVR-1012 [Reference 8]

was 0.801 mrem.

The results of the direct radiation measurements for 2024 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 2024 are plotted.

Gamma Spectrometry Naturally occurring K-40 was detected in all 60 samples with concentrations for the 40 indicator location samples ranging from 942 to 1,524 pCi/L with an average concentration of 1,244 pCi/L, and the 20 control location sample concentrations ranging from 1,221 to 1,521 pCi/L with an average concentration of 1,343 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 detected in three of the 40 indicator location samples with concentrations ranging from 251 pCi/L to 372 pCi/L with an average concentration of 292 pCi/L. Tritium was not detected in any of the four control location 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 2024 are plotted.

Gamma Spectrometry Naturally occurring K-40 was detected in one of the indicator samples with a concentration of 354 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 five of the 12 drinking water samples. Sample concentrations ranged from 2.1 to 3.4 pCi/L with an average concentration of 2.6 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 2024 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 detected in one of the 12 indicator samples with a concentration of 41 pCi/L. 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 one indicator location (11S6) were collected throughout the growing season. All samples were analyzed for gamma emitters and included Swiss chard and collards.

Gamma Spectrometry Naturally occurring Be-7, attributed to cosmic ray activity in the atmosphere, was detected in three of the eight indicator location samples with concentrations ranging from 323 to 878 pCi/kg wet with an average concentration of 527 pCi/kg wet.

Preoperational data is not available for comparison.

Naturally occurring K-40 was detected in all eight indicator location samples with concentrations ranging from 2,590 to 3,996 pCi/kg wet with an average concentration of 3,211 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 and nine samples were analyzed for gross beta.

Gross Beta Gross beta analysis of Surface water control samples was initiated in the 2nd quarter of 2024 to coincide with an update to the SSES Technical Requirements Manual (TRM). Gross beta activity was detected in four of the nine surface water samples.

Sample concentrations ranged from 2.7 to 4.4 pCi/L with an average concentration of 3.3 pCi/L.

Tritium Tritium activity was not detected in any of the 20 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 2024 are plotted.

Gamma Spectrometry Naturally occurring K-40 was not detected in any of the indicator location samples. One control locator sample had K-40 detected with a concentration 36.5 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 not detected in any of the indicator or control samples. 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 2024 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 2,849 to 4,335 pCi/kg wet with an average concentration of 3,706 pCi/kg wet, and in all control location samples at concentrations ranging from 2,122 to 3,456 pCi/kg wet with an average concentration of 2,978 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 6,594 to 7,370 pCi/kg dry with an average concentration of 6,856 pCi/kg dry, and in all of the control location samples with concentrations ranging from 10,370 to 10,450 pCi/kg dry with an average concentration of 10,410 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 4,211 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 575 to 871 pCi/kg dry with an average concentration of 732 pCi/kg dry, and in both of the control location samples at concentrations ranging from 881 to 1,225 pCi/kg dry with an average concentration of 1,053 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 478 to 873 pCi/kg dry with an average concentration of 649 pCi/kg dry, and in both of the control location samples at concentrations ranging from 738 and 982 pCi/kg dry with an average concentration of 860 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 2024 LAND USE CENSUS Applied Ecoscience, Inc. conducted a Land Use Census during the 2024 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 Jul-Oct, 2024 miles Nearest Garden Jul-Oct, 2024 miles Nearest Dairy Farm July-Nov, 2024 miles 1 N 1.3 4.6

>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

>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 2024 Land Use Census results are summarized in the above table.

V.

Annotations to Previous AREOR There are no annotations to the previous AREOR.

VI.

Conclusions The Radiological Environmental Monitoring Program for SSES was conducted during 2024 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, 2024, prepared by Teledyne Brown Engineering, Knoxville TN.

[2]

Final Safety Analysis Report

[3]

Final Environmental Statement

[4]

Susquehanna Steam Electric Station, 2024 Land Use Census. Prepared for Susquehanna Nuclear, LLC, Berwick, PA. December 2024. 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

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (4)

Air Particulates GR-B 363 10 1.395E+01 (312/312) 10S3 1.462E+01 (52/52) 1.287E+01 (51/51) 0 (E-3 pCi/m3) 0.6 MILES SSW (6.880E+00 - 2.390E+01)

GAMMA 28 BE-7 28 N/A 8.187E+01 (24/24) 10S3 9.491E+01 (4/4) 7.359E+01 (4/4) 0 0.6 MILES SSW (5.692E+01 - 1.334E+02)

K-40 28 N/A

<MDC (0/24)

<MDC (0/4) 0 CS-134 28 50

<MDC (0/24)

<MDC (0/4) 0 CS-137 28 60

<MDC (0/24)

<MDC (0/4) 0 Charcoal GAMMA 363 (E-3 pCi/m3)

I-131 363 70

<MDC (0/312)

<MDC (0/51) 0 Ambient Radiation OSLD 239 N/A 1.689E+01 (219/219) 9S2 3.867E+01 (4/4) 1.370E+01 (20/20) 0 (mR/std. qtr.)

0.2 MILES S (3.589E+01 - 4.111E+01)

Milk I-131 60 1

<MDC (0/40)

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

GAMMA 60 K-40 60 N/A 1.244E+03 (40/40) 10G1 C 1.343E+03 (20/20) 1.343E+03 (20/20) 0 14 MILES SSW (1.221E+03 - 1.521E+03)

CS-134 60 15

<MDC (0/40)

<MDC (0/20) 0 (6.388E+00 - 4.111E+01)

(5.354E+01 - 8.926E+01)

<MDC

<MDC 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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 (5.690E+00 - 2.460E+01)

(6.380E+00 - 2.120E+01)

(4.773E+01 - 1.334E+02)

<MDC

<MDC (8.386E+00 - 1.775E+01)

(9.424E+02 - 1.524E+03)

(1.221E+03 - 1.521E+03)

A-2

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Milk (cont'd)

CS-137 60 18

<MDC (0/40)

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

BA-140 60 60

<MDC (0/40)

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

<MDC (0/40)

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

<MDC (0/40)

<MDC (0/20) 0 Ground Water H-3 44 2000 2.923E+02 (3/40) 8S4 3.720E+02 (1/4)

<MDC (0/4) 0 (pCi/Liter) 0.1 MILES SSE (3.720E+02)

GAMMA 44 K-40 44 N/A 3.542E+02 (1/40) 4S9 3.542E+02 (1/4)

<MDC (0/4) 0 0.3 MILES E (3.542E+02)

MN-54 44 15

<MDC (0/40)

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

<MDC (0/40)

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

<MDC (0/40)

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

<MDC (0/40)

<MDC (0/4) 0

<MDC

<MDC (3.542E+02)

(2.510E+02 - 3.720E+02)

<MDC

<MDC A-3

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Ground Water (cont'd)

ZN-65 44 30

<MDC (0/40)

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

NB-95 44 15

<MDC (0/40)

<MDC (0/4) 0 ZR-95 44 30

<MDC (0/40)

<MDC (0/4) 0 I-131 44 15

<MDC (0/40)

<MDC (0/4) 0 CS-134 44 15

<MDC (0/40)

<MDC (0/4) 0 CS-137 44 18

<MDC (0/40)

<MDC (0/4) 0 BA-140 44 60

<MDC (0/40)

<MDC (0/4) 0 LA-140 44 15

<MDC (0/40)

<MDC (0/4) 0 TH-228 44 N/A 4.657E+01 (1/40) 4S9 4.657E+01 (1/4)

<MDC (0/4) 0 0.3 MILES E (4.657E+01)

Drinking Water GR-B 12 4

2.564E+00 (5/12) 12H2 2.564E+00 (5/12) 0 (pCi/Liter) 26 MILES WSW H-3 12 2000

<MDC (0/12) 0 (4.657E+01)

<MDC

<MDC (2.120E+00 - 3.370E+00)

<MDC

<MDC N/A N/A (2.120E+00 - 3.370E+00)

A-4

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Drinking Water (cont'd)

GAMMA 12 (pCi/Liter)

K-40 12 N/A 4.111E+01 (1/12) 12H2 4.111E+01 (1/12) 0 26 MILES WSW (4.111E+01)

MN-54 12 15

<MDC (0/12) 0 CO-58 12 15

<MDC (0/12) 0 FE-59 12 30

<MDC (0/12) 0 CO-60 12 15

<MDC (0/12) 0 ZN-65 12 30

<MDC (0/12) 0 NB-95 12 15

<MDC (0/12) 0 ZR-95 12 30

<MDC (0/12) 0 I-131 12 15

<MDC (0/12) 0 CS-134 12 15

<MDC (0/12) 0 (4.111E+01)

<MDC

<MDC N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

<MDC A-5

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Drinking Water (cont'd)

CS-137 12 18

<MDC (0/12) 0 (pCi/Liter)

BA-140 12 60

<MDC (0/12) 0 LA-140 12 15

<MDC (0/12) 0 Food/Garden Crops GAMMA 8

(pCi/kg wet)

BE-7 8

N/A 5.274E+02 (3/8) 11S6 5.274E+02 (3/8) 0 0.5 MILES SW K-40 8

N/A 3.211E+03 (8/8) 11S6 3.211E+03 (8/8) 0 0.5 MILES SW MN-54 8

N/A

<MDC (0/8) 0 CO-58 8

N/A

<MDC (0/8) 0 FE-59 8

N/A

<MDC (0/8) 0 CO-60 8

N/A

<MDC (0/8) 0 ZN-65 8

N/A

<MDC (0/8) 0 (2.590E+03 - 3.996E+03)

N/A N/A N/A N/A N/A

<MDC

<MDC N/A (3.231E+02 - 8.781E+02)

N/A N/A N/A N/A

<MDC (3.231E+02 - 8.781E+02)

(2.590E+03 - 3.996E+03)

<MDC A-6

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Food/Garden Crops (cont'd) NB-95 8

N/A

<MDC (0/8) 0 (pCi/kg wet)

ZR-95 8

N/A

<MDC (0/8) 0 I-131 8

60

<MDC (0/8) 0 CS-134 8

60

<MDC (0/8) 0 CS-137 8

80

<MDC (0/8) 0 BA-140 8

N/A

<MDC (0/8) 0 LA-140 8

N/A

<MDC (0/8) 0 AC-228 8

N/A

<MDC (0/8) 0 TH-228 8

N/A

<MDC (0/8) 0 N/A N/A N/A N/A N/A N/A N/A N/A N/A

<MDC

<MDC A-7

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Surface Water GR-B 9

4 N/A 6S6 C 3.308E+00 (4/9) 3.308E+00 (4/9) 0 (pCi/Liter) 0.8 MILES ESE (2.710E+00 - 4.370E+00)

H-3 35 2000

<MDC (0/20)

<MDC (0/15) 0 GAMMA 35 K-40 35 N/A

<MDC (0/20) 6S6 C 3.647E+01 (1/12) 3.647E+01 (1/15) 0 0.8 MILES ESE (3.647E+01)

MN-54 35 15

<MDC (0/20)

<MDC (0/15) 0 CO-58 35 15

<MDC (0/20)

<MDC (0/15) 0 FE-59 35 30

<MDC (0/20)

<MDC (0/15) 0 CO-60 35 15

<MDC (0/20)

<MDC (0/15) 0 ZN-65 35 30

<MDC (0/20)

<MDC (0/15) 0 NB-95 35 15

<MDC (0/20)

<MDC (0/15) 0 ZR-95 35 30

<MDC (0/20)

<MDC (0/15) 0 I-131 35 15

<MDC (0/20)

<MDC (0/15) 0

<MDC

<MDC (3.647E+01)

<MDC (2.710E+00 - 4.370E+00)

A-8

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Surface Water (cont'd)

CS-134 35 15

<MDC (0/20)

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

CS-137 35 18

<MDC (0/20)

<MDC (0/15) 0 BA-140 35 60

<MDC (0/20)

<MDC (0/15) 0 LA-140 35 15

<MDC (0/20)

<MDC (0/15) 0 TH-228 35 N/A

<MDC (0/20)

<MDC (0/15) 0 Fish GAMMA 14 (pCi/kg wet)

K-40 14 N/A 3.706E+03 (8/8)

IND 3.730E+03 (6/6) 2.978E+03 (6/6) 0 0.9-1.4 MILES ESE (2.849E+03 - 4.335E+03)

MN-54 14 130

<MDC (0/8)

<MDC (0/6) 0 CO-58 14 130

<MDC (0/8)

<MDC (0/6) 0 FE-59 14 260

<MDC (0/8)

<MDC (0/6) 0 CO-60 14 130

<MDC (0/8)

<MDC (0/6) 0

<MDC

<MDC (2.849E+03 - 4.335E+03)

<MDC

<MDC (2.122E+03 - 3.456E+03)

A-9

LOWER LIMIT NUMBER OF MEDIUM OR PATHWAY OF CONTROL LOCATION NONROUTINE SAMPLED DETECTION MEAN (3)

NAME MEAN (3)

MEAN (3)

REPORTED (UNIT OF MEASUREMENT)

(LLD) (2)

RANGE DISTANCE AND DIRECTION RANGE RANGE MEASURMENTS (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 ANALYSIS AND TOTAL NUMBER OF ANALYSIS PERFORMED (1)

LOCATION WITH HIGHEST MEAN ALL INDICATOR LOCATIONS Reporting Period: December 26, 2023 to December 31, 2024 Fish (cont'd)

ZN-65 14 260

<MDC (0/8)

<MDC (0/6) 0 (pCi/kg wet)

CS-134 14 130

<MDC (0/8)

<MDC (0/6) 0 CS-137 14 150

<MDC (0/8)

<MDC (0/6) 0 Sediment GAMMA 6

(pCi/kg dry)

K-40 6

N/A 6.856E+03 (4/4) 2B 1.041E+04 (2/2) 1.041E+04 (2/2) 0 1.6 MILES NNE (1.037E+04 - 1.045E+04)

CS-134 6

150

<MDC (0/4)

<MDC (0/2) 0 CS-137 6

180

<MDC (0/4)

<MDC (0/2) 0 RA-226 6

N/A

<MDC (0/4) 2B C 4.211E+03 (1/2) 4.211E+03 (1/2) 0 1.6 MILES NNE (4.211E+03)

AC-228 6

N/A 7.315E+02 (4/4) 2B C 1.053E+03 (2/2) 1.053E+03 (2/2) 0 1.6 MILES NNE (8.808E+02 - 1.225E+03)

(8.808E+02 - 1.225E+03)

TH-228 6

N/A 6.494E+02 (4/4) 2B C 8.598E+02 (2/2) 8.598E+02 (2/2) 0 1.6 MILES NNE (7.380E+02 - 9.815E+02)

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

2. The Technical Requirement LLDs are shown when applicable.

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).

<MDC

<MDC (6.594E+03 - 7.370E+03)

(1.037E+04 - 1.045E+04)

(5.747E+02 - 8.707E+02)

(4.784E+02 - 8.733E+02)

(7.380E+02 - 9.815E+02)

<MDC A-10

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.SW; 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 11A1 0.6 mi.SW 41.08536

-76.15326 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 & 5 TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices.

Surface &

Drinking Water Tritium Monthly Applied Ecoscience, Appendix 3, 4, 5, 13 TBE-2010 Beta Activity by Liquid Scintillation (Direct Prep & Simple Distillation)

Surface &

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

Ground Water Tritium Quarterly Applied Ecoscience, Appendix 6 TBE-2010 Beta Activity by Liquid Scintillation (Direct Prep & Simple Distillation)

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 Monthly (Apr - Nov) /

Quarterly Applied Ecoscience, Appendix 8 TBE-2010 Beta Activity by Liquid Scintillation (Direct Prep & Simple Distillation)

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

l L

MAP 8-2 Direct Radiation Monitoring Locations From One to Five Miles B-11

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

MAP 8-4 Environmental Sampling Locations Within One Mile B-13

Hun11ngton MIiia I

)

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

/ ~;;r e::

~,....

. *> {~;.

ii";-

'*::. /fi,/,J;i~{

J---1

)

Conynuham

MAP 8-6 Environmental Sampling Locations Greater Than Five Miles B-15

---=--

c.!9,!( ~=;

APPENDIX C DATA TABLES C-1

TABLE C-1 GROSS BETA ANALYSES OF AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 3S2 8G1 12E1 12S1 13S6 9B1 01/03/24 - 01/10/24 11 +/- 2 8 +/- 2 10 +/- 2 9 +/- 2 12 +/- 2 10 +/- 2 01/10/24 - 01/17/24 16 +/- 2 15 +/- 2 15 +/- 2 17 +/- 2 17 +/- 2 17 +/- 2 01/17/24 - 01/23/24 14 +/- 2 15 +/- 2 16 +/- 3 13 +/- 2 18 +/- 3 15 +/- 3 01/23/24 - 01/31/24 8 +/- 2 12 +/- 3 9 +/- 2 9 +/- 2 9 +/- 2 9 +/- 2 01/31/24 - 02/07/24 8 +/- 2 (a) 13 +/- 2 10 +/- 2 10 +/- 2 14 +/- 2 02/07/24 - 02/14/24 13 +/- 2 11 +/- 3 12 +/- 2 11 +/- 2 13 +/- 2 12 +/- 2 02/14/24 - 02/21/24 11 +/- 2 10 +/- 2 12 +/- 2 10 +/- 2 12 +/- 2 13 +/- 2 02/21/24 - 02/28/24 14 +/- 2 11 +/- 2 13 +/- 2 14 +/- 2 13 +/- 2 12 +/- 2 02/28/24 - 03/06/24 9 +/- 2 7 +/- 2 6 +/- 2 7 +/- 2 9 +/- 2 9 +/- 2 03/06/24 - 03/13/24 10 +/- 2 9 +/- 2 10 +/- 2 9 +/- 2 9 +/- 2 9 +/- 2 03/13/24 - 03/20/24 14 +/- 2 15 +/- 2 14 +/- 2 14 +/- 2 15 +/- 2 13 +/- 2 03/20/24 - 03/27/24 9 +/- 2 8 +/- 2 9 +/- 2 10 +/- 2 10 +/- 2 9 +/- 2 03/27/24 - 04/02/24 13 +/- 2 10 +/- 2 11 +/- 2 12 +/- 2 13 +/- 2 11 +/- 2 04/02/24 - 04/10/24 6 +/- 1 7 +/- 2 6 +/- 1 6 +/- 1 6 +/- 1 6 +/- 2 04/10/24 - 04/16/24 13 +/- 2 11 +/- 2 11 +/- 2 12 +/- 2 13 +/- 2 12 +/- 2 04/16/24 - 04/24/24 10 +/- 2 10 +/- 2 12 +/- 2 8 +/- 2 11 +/- 2 10 +/- 2 04/24/24 - 05/01/24 17 +/- 2 15 +/- 2 14 +/- 2 12 +/- 2 16 +/- 2 15 +/- 2 05/01/24 - 05/08/24 11 +/- 2 10 +/- 2 11 +/- 2 10 +/- 2 10 +/- 2 10 +/- 2 05/08/24 - 05/15/24 8 +/- 2 6 +/- 2 7 +/- 2 6 +/- 2 6 +/- 2 7 +/- 2 05/15/24 - 05/22/24 14 +/- 2 9 +/- 2 10 +/- 2 12 +/- 2 12 +/- 2 9 +/- 2 05/22/24 - 05/29/24 14 +/- 2 15 +/- 2 16 +/- 2 13 +/- 2 15 +/- 2 15 +/- 2 05/29/24 - 06/05/24 16 +/- 2 17 +/- 2 15 +/- 2 15 +/- 2 16 +/- 2 15 +/- 2 06/05/24 - 06/12/24 7 +/- 2 8 +/- 2 9 +/- 2 8 +/- 2 10 +/- 2 9 +/- 2 06/12/24 - 06/18/24 14 +/- 3 15 +/- 3 17 +/- 3 15 +/- 3 15 +/- 3 14 +/- 3 06/18/24 - 06/26/24 19 +/- 2 17 +/- 2 20 +/- 2 19 +/- 2 19 +/- 2 19 +/- 2 06/26/24 - 07/03/24 10 +/- 2 9 +/- 2 12 +/- 2 14 +/- 4 12 +/- 2 11 +/- 2 07/03/24 - 07/10/24 19 +/- 3 17 +/- 2 20 +/- 3 18 +/- 2 18 +/- 3 19 +/- 3 07/10/24 - 07/17/24 13 +/- 2 13 +/- 2 15 +/- 2 13 +/- 2 15 +/- 2 15 +/- 2 07/17/24 - 07/24/24 12 +/- 2 12 +/- 2 16 +/- 2 13 +/- 2 13 +/- 2 16 +/- 2 07/24/24 - 07/31/24 16 +/- 2 15 +/- 2 16 +/- 2 24 +/- 3 18 +/- 2 16 +/- 2 07/31/24 - 08/07/24 17 +/- 2 18 +/- 2 19 +/- 2 17 +/- 2 19 +/- 3 19 +/- 3 08/07/24 - 08/14/24 10 +/- 2 10 +/- 2 12 +/- 2 8 +/- 2 10 +/- 2 11 +/- 2 08/14/24 - 08/20/24 16 +/- 3 15 +/- 2 16 +/- 2 15 +/- 2 16 +/- 2 19 +/- 3 08/20/24 - 08/28/24 23 +/- 3 21 +/- 2 22 +/- 2 20 +/- 2 20 +/- 2 21 +/- 2 08/28/24 - 09/04/24 15 +/- 2 11 +/- 2 13 +/- 2 13 +/- 2 14 +/- 2 14 +/- 2 09/04/24 - 09/11/24 12 +/- 2 13 +/- 2 13 +/- 2 13 +/- 2 11 +/- 2 13 +/- 2 09/11/24 - 09/17/24 23 +/- 3 21 +/- 3 24 +/- 3 22 +/- 3 24 +/- 3 25 +/- 3 09/17/24 - 09/24/24 22 +/- 3 18 +/- 2 23 +/- 3 20 +/- 3 21 +/- 3 21 +/- 3 09/24/24 - 10/02/24 8 +/- 2 10 +/- 2 10 +/- 2 10 +/- 2 9 +/- 2 9 +/- 2 10/02/24 - 10/09/24 19 +/- 2 18 +/- 2 17 +/- 2 16 +/- 2 20 +/- 2 19 +/- 2 10/09/24 - 10/15/24 11 +/- 2 13 +/- 2 12 +/- 2 12 +/- 2 12 +/- 2 14 +/- 2 10/15/24 - 10/23/24 20 +/- 2 19 +/- 2 21 +/- 2 24 +/- 2 23 +/- 3 20 +/- 2 10/23/24 - 10/30/24 17 +/- 2 14 +/- 2 18 +/- 2 19 +/- 2 14 +/- 2 16 +/- 2 10/30/24 - 11/06/24 20 +/- 2 14 +/- 2 19 +/- 2 18 +/- 2 17 +/- 2 19 +/- 2 11/06/24 - 11/13/24 13 +/- 2 11 +/- 2 13 +/- 2 14 +/- 2 12 +/- 2 13 +/- 2 11/13/24 - 11/20/24 18 +/- 3 16 +/- 2 18 +/- 2 17 +/- 2 17 +/- 2 16 +/- 2 11/20/24 - 11/26/24 12 +/- 2 12 +/- 2 12 +/- 2 12 +/- 2 13 +/- 2 12 +/- 2 11/26/24 - 12/04/24 16 +/- 2 14 +/- 2 14 +/- 2 15 +/- 2 16 +/- 2 16 +/- 2 12/04/24 - 12/11/24 19 +/- 2 18 +/- 2 15 +/- 2 17 +/- 2 18 +/- 2 18 +/- 2 12/11/24 - 12/17/24 13 +/- 2 10 +/- 2 13 +/- 2 12 +/- 2 17 +/- 2 11 +/- 2 12/17/24 - 12/23/24 12 +/- 2 10 +/- 2 13 +/- 2 13 +/- 2 12 +/- 2 15 +/- 3 12/23/24 - 12/31/24 12 +/- 2 11 +/- 2 14 +/- 2 11 +/- 2 12 +/- 2 12 +/- 2 14 + 8 13 + 7 14 + 8 13 + 9 14 + 8 13.9 + 8 (a) Sample unable to be obtained due to no power at the station.

AVERAGE C-2

TABLE C-1 GROSS BETA ANALYSES OF AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 10S3 01/03/24 - 01/10/24 11 +/- 2 01/10/24 - 01/17/24 17 +/- 2 01/17/24 - 01/23/24 19 +/- 3 01/23/24 - 01/31/24 8 +/- 2 01/31/24 - 02/07/24 12 +/- 2 02/07/24 - 02/14/24 13 +/- 2 02/14/24 - 02/21/24 12 +/- 2 02/21/24 - 02/28/24 15 +/- 2 02/28/24 - 03/06/24 7 +/- 2 03/06/24 - 03/13/24 10 +/- 2 03/13/24 - 03/20/24 14 +/- 2 03/20/24 - 03/27/24 8 +/- 2 03/27/24 - 04/02/24 14 +/- 2 04/02/24 - 04/10/24 7 +/- 2 04/10/24 - 04/16/24 12 +/- 2 04/16/24 - 04/24/24 11 +/- 2 04/24/24 - 05/01/24 15 +/- 2 05/01/24 - 05/08/24 14 +/- 2 05/08/24 - 05/15/24 8 +/- 2 05/15/24 - 05/22/24 14 +/- 2 05/22/24 - 05/29/24 15 +/- 2 05/29/24 - 06/05/24 16 +/- 2 06/05/24 - 06/12/24 11 +/- 2 06/12/24 - 06/18/24 17 +/- 3 06/18/24 - 06/26/24 21 +/- 2 06/26/24 - 07/03/24 17 +/- 5 07/03/24 - 07/10/24 20 +/- 3 07/10/24 - 07/17/24 15 +/- 2 07/17/24 - 07/24/24 14 +/- 2 07/24/24 - 07/31/24 16 +/- 2 07/31/24 - 08/07/24 21 +/- 3 08/07/24 - 08/14/24 12 +/- 2 08/14/24 - 08/20/24 17 +/- 3 08/20/24 - 08/28/24 23 +/- 3 08/28/24 - 09/04/24 15 +/- 2 09/04/24 - 09/11/24 13 +/- 2 09/11/24 - 09/17/24 24 +/- 3 09/17/24 - 09/24/24 21 +/- 2 09/24/24 - 10/02/24 9 +/- 2 10/02/24 - 10/09/24 16 +/- 2 10/09/24 - 10/15/24 12 +/- 2 10/15/24 - 10/23/24 22 +/- 2 10/23/24 - 10/30/24 18 +/- 2 10/30/24 - 11/06/24 21 +/- 3 11/06/24 - 11/13/24 13 +/- 2 11/13/24 - 11/20/24 18 +/- 2 11/20/24 - 11/26/24 13 +/- 2 11/26/24 - 12/04/24 16 +/- 2 12/04/24 - 12/11/24 16 +/- 2 12/11/24 - 12/17/24 13 +/- 2 12/17/24 - 12/23/24 9 +/- 2 12/23/24 - 12/31/24 15 +/- 2 15 + 8 AVERAGE C-3

TABLE C-2 GAMMA SPECTROSCOPIC ANALYSES OF COMPOSITED AIR PARTICULATE FILTERS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION SITE PERIOD Be-7 K-40 Cs-134 Cs-137 8G1 01/03/24 - 04/02/24 69 +/- 16

< 17

< 1

< 1 04/02/24 - 07/03/24 83 +/- 20

< 16

< 1

< 1 07/03/24 - 10/02/24 89 +/- 21

< 20

< 1

< 1 10/02/24 - 12/31/24 54 +/- 14

< 11

< 1

< 1 AVERAGE 74 + 32 3S2 01/03/24 - 04/02/24 61 +/- 18

< 20

< 1

< 1 04/02/24 - 07/03/24 95 +/- 22

< 22

< 2

< 1 07/03/24 - 10/02/24 112 +/- 33

< 24

< 2

< 2 10/02/24 - 12/31/24 65 +/- 15

< 19

< 1

< 1 AVERAGE 83 + 49 12E1 01/03/24 - 04/02/24 61 +/- 18

< 24

< 1

< 1 04/02/24 - 07/03/24 91 +/- 19

< 16

< 1

< 1 07/03/24 - 10/02/24 74 +/- 18

< 16

< 1

< 1 10/02/24 - 12/31/24 64 +/- 18

< 20

< 1

< 1 AVERAGE 73 + 27 12S1 01/03/24 - 04/02/24 49 +/- 15

< 14

< 1

< 1 04/02/24 - 07/03/24 88 +/- 15

< 17

< 1

< 1 07/03/24 - 10/02/24 95 +/- 17

< 13

< 1

< 1 10/02/24 - 12/31/24 63 +/- 15

< 15

< 1

< 1 AVERAGE 74 + 43 13S6 01/03/24 - 04/02/24 79 +/- 20

< 13

< 1

< 1 04/02/24 - 07/03/24 119 +/- 23

< 14

< 1

< 1 07/03/24 - 10/02/24 88 +/- 23

< 18

< 1

< 1 10/02/24 - 12/31/24 48 +/- 13

< 16

< 1

< 1 AVERAGE 84 + 59 9B1 01/03/24 - 04/02/24 68 +/- 14

< 14

< 1

< 1 04/02/24 - 07/03/24 97 +/- 21

< 20

< 1

< 1 07/03/24 - 10/02/24 102 +/- 26

< 16

< 1

< 1 10/02/24 - 12/31/24 65 +/- 16

< 16

< 1

< 1 AVERAGE 83 + 38 10S3 01/03/24 - 04/02/24 85 +/- 20

< 22

< 1

< 1 04/02/24 - 07/03/24 104 +/- 31

< 35

< 2

< 2 07/03/24 - 10/02/24 133 +/- 29

< 42

< 2

< 2 10/02/24 - 12/31/24 57 +/- 14

< 20

< 1

< 1 AVERAGE 95 + 64 C-4

TABLE C-3 IODINE-131 ANALYSES OF AIR IODINE SAMPLES SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 3S2 8G1 12E1 12S1 13S6 9B1 01/03/24 - 01/10/24

< 18

< 19

< 8

< 18

< 20 01/10/24 - 01/17/24

< 24

< 9

< 20

< 21

< 24

< 21 01/17/24 - 01/23/24

< 29

< 31

< 30

< 30 01/23/24 - 01/31/24

< 14

< 16

< 17

< 14

< 17 01/31/24 - 02/07/24

< 16

< 33

< 34

< 33

< 34 02/07/24 - 02/14/24

< 19

< 15

< 9

< 19

< 17 02/14/24 - 02/21/24

< 14

< 21

< 18

< 22 02/21/24 - 02/28/24

< 13

< 18

< 28

< 27

< 31

< 27 02/28/24 - 03/06/24

< 17

< 13

< 20

< 17

< 20 03/06/24 - 03/13/24

< 12

< 25

< 19

< 12

< 25 03/13/24 - 03/20/24

< 24

< 33

< 34

< 33

< 25

< 34 03/20/24 - 03/27/24

< 15

< 23

< 16

< 23 03/27/24 - 04/02/24

< 10

< 15

< 16

< 15

< 23 04/02/24 - 04/10/24

< 26

< 10

< 26

< 7 04/10/24 - 04/16/24

< 7

< 18

< 17

< 18

< 11

< 11 04/16/24 - 04/24/24

< 30

< 20

< 19

< 20

< 31

< 9 04/24/24 - 05/01/24

< 8

< 15

< 7

< 10 05/01/24 - 05/08/24

< 12

< 10

< 9

< 10

< 13

< 6 05/08/24 - 05/15/24

< 26

< 34

< 25

< 26

< 11

< 33 05/15/24 - 05/22/24

< 22

< 23

< 22

< 23

< 21

< 17 05/22/24 - 05/29/24

< 23

< 32

< 30

< 31

< 23

< 13 05/29/24 - 06/05/24

< 21

< 28

< 21

< 24

< 9

< 27 06/05/24 - 06/12/24

< 28

< 22

< 21

< 22

< 27

< 16 06/12/24 - 06/18/24

< 18

< 13

< 18 06/18/24 - 06/26/24

< 59

< 60

< 61

< 58

< 25 06/26/24 - 07/03/24

< 26

< 29

< 32

< 56

< 31

< 30 07/03/24 - 07/10/24

< 17

< 18

< 12

< 17

< 19 07/10/24 - 07/17/24

< 24

< 25

< 11

< 22

< 23

< 28 07/17/24 - 07/24/24

< 34

< 25

< 23

< 33

< 34

< 25 07/24/24 - 07/31/24

< 22

< 13

< 14

< 21

< 22

< 9 07/31/24 - 08/07/24

< 26

< 27

< 17

< 26

< 12

< 28 08/07/24 - 08/14/24

< 12

< 20

< 21

< 22

< 11 08/14/24 - 08/20/24

< 19

< 12

< 18

< 19

< 22 08/20/24 - 08/28/24

< 12

< 21

< 15

< 20

< 10

< 22 08/28/24 - 09/04/24

< 23

< 32

< 17

< 23

< 24

< 31 09/04/24 - 09/11/24

< 21

< 20

< 18

< 19

< 22

< 19 09/11/24 - 09/17/24

< 14

< 27

< 17

< 18

< 18 09/17/24 - 09/24/24

< 11

< 22

< 20

< 18

< 12

< 20 09/24/24 - 10/02/24

< 20

< 17

< 12

< 18

< 19

< 18 10/02/24 - 10/09/24

< 28

< 29

< 13

< 25

< 26

< 28 10/09/24 - 10/15/24

< 8

< 23

< 10

< 23

< 9

< 23 10/15/24 - 10/23/24

< 21

< 17

< 20

< 14

< 21

< 16 10/23/24 - 10/30/24

< 11

< 23

< 25

< 23 10/30/24 - 11/06/24

< 12

< 8

< 17

< 16

< 12

< 17 11/06/24 - 11/13/24

< 30

< 22

< 23

< 29

< 17 11/13/24 - 11/20/24

< 31

< 18

< 24

< 25

< 29

< 24 11/20/24 - 11/26/24

< 21

< 13

< 18

< 18 11/26/24 - 12/04/24

< 27

< 12

< 24

< 24 12/04/24 - 12/11/24

< 22

< 14

< 19

< 20

< 22

< 20 12/11/24 - 12/17/24

< 11

< 10

< 19

< 20

< 21

< 9 12/17/24 - 12/23/24

< 15

< 12

< 21

< 22

< 13 12/23/24 - 12/31/24

< 26

< 18

< 17

< 26

< 11 (a) Sample unable to be obtained due to no power at the station.

AVERAGE (a)

C-5

TABLE C-3 IODINE-131 ANALYSES OF AIR IODINE SAMPLES SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in units of E-03 pCi/cu.m. +/- 2 sigma COLLECTION PERIOD 10S3 01/03/24 - 01/10/24

< 20 01/10/24 - 01/17/24

< 21 01/17/24 - 01/23/24

< 13 01/23/24 - 01/31/24

< 17 01/31/24 - 02/07/24

< 14 02/07/24 - 02/14/24

< 21 02/14/24 - 02/21/24

< 20 02/21/24 - 02/28/24

< 29 02/28/24 - 03/06/24

< 21 03/06/24 - 03/13/24

< 26 03/13/24 - 03/20/24

< 15 03/20/24 - 03/27/24

< 10 03/27/24 - 04/02/24

< 16 04/02/24 - 04/10/24

< 12 04/10/24 - 04/16/24

< 18 04/16/24 - 04/24/24

< 21 04/24/24 - 05/01/24

< 16 05/01/24 - 05/08/24

< 10 05/08/24 - 05/15/24

< 27 05/15/24 - 05/22/24

< 23 05/22/24 - 05/29/24

< 32 05/29/24 - 06/05/24

< 22 06/05/24 - 06/12/24

< 23 06/12/24 - 06/18/24

< 18 06/18/24 - 06/26/24

< 60 06/26/24 - 07/03/24

< 45 07/03/24 - 07/10/24

< 18 07/10/24 - 07/17/24

< 23 07/17/24 - 07/24/24

< 33 07/24/24 - 07/31/24

< 21 07/31/24 - 08/07/24

< 27 08/07/24 - 08/14/24

< 22 08/14/24 - 08/20/24

< 20 08/20/24 - 08/28/24

< 22 08/28/24 - 09/04/24

< 23 09/04/24 - 09/11/24

< 14 09/11/24 - 09/17/24

< 17 09/17/24 - 09/24/24

< 20 09/24/24 - 10/02/24

< 18 10/02/24 - 10/09/24

< 25 10/09/24 - 10/15/24

< 22 10/15/24 - 10/23/24

< 20 10/23/24 - 10/30/24

< 26 10/30/24 - 11/06/24

< 17 11/06/24 - 11/13/24

< 23 11/13/24 - 11/20/24

< 25 11/20/24 - 11/26/24

< 18 11/26/24 - 12/04/24

< 24 12/04/24 - 12/11/24

< 20 12/11/24 - 12/17/24

< 20 12/17/24 - 12/23/24

< 21 12/23/24 - 12/31/24

< 17 AVERAGE C-6

TABLE C-4 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

First Quarter Second Quarter Third Quarter Fourth Quarter 1/5/2024 to 4/19/2024 4/19/2024 to 7/3/2024 7/3/2024 to 10/2/2024 10/2/2024 to 1/15/2025 LOCATION ONSITE 1S2 21.8 +/- 1.5 28.1 +/- 0.2 28.0 +/- 1.0 26.7 +/- 3.6 2S2 9.9 +/- 2.0 11.6 +/- 0.3 14.6 +/- 0.1 14.3 +/- 1.6 2S3 19.6 +/- 1.5 25.4 +/- 3.3 24.4 +/- 3.1 23.7 +/- 2.4 3S2 13.8 +/- 1.7 11.3 +/- 0.1 14.1 +/- 1.4 15.2 +/- 1.0 3S3 11.6 +/- 2.6 14.1 +/- 1.1 14.3 +/- 0.0 15.1 +/- 0.3 4S3 15.1 +/- 0.8 19.5 +/- 5.2 21.1 +/- 0.8 22.3 +/- 0.9 4S6 12.6 +/- 0.1 15.9 +/- 1.3 14.8 +/- 0.2 16.2 +/- 0.3 5S4 9.4 +/- 0.5 10.3 +/- 0.6 13.8 +/- 0.4 13.8 +/- 0.1 5S7 15.1 +/- 0.9 16.1 +/- 1.0 17.5 +/- 0.4 16.9 +/- 1.4 6S4 23.1 +/- 0.9 20.8 +/- 3.8 25.3 +/- 1.1 23.6 +/- 1.2 6S9 22.5 +/- 0.7 22.3 +/- 5.5 24.6 +/- 1.9 25.2 +/- 0.4 7S6 19.6 +/- 0.2 21.8 +/- 0.2 23.5 +/- 1.3 21.5 +/- 0.9 7S7 11.9 +/- 0.6 10.6 +/- 1.8 13.3 +/- 0.1 14.6 +/- 0.1 8S2 21.6 +/- 0.3 21.6 +/- 1.6 25.5 +/- 4.2 22.6 +/- 3.3 9S2 35.9 +/- 0.1 37.1 +/- 2.9 40.6 +/- 1.1 41.1 +/- 2.5 9S3 16.6 +/- 0.3 16.4 +/- 2.2 23.5 +/- 0.4 22.5 +/- 0.7 9S4 18.2 +/- 0.1 15.2 +/- 0.5 17.2 +/- 1.5 17.9 +/- 0.3 10S1 11.0 +/- 1.1 11.5 +/- 0.8 13.1 +/- 0.4 14.3 +/- 2.8 10S2 21.7 +/- 0.6 23.4 +/- 2.8 23.2 +/- 2.8 24.7 +/- 0.2 11S7 10.5 +/- 0.5 13.0 +/- 2.1 14.4 +/- 0.7 16.1 +/- 1.7 12S1 14.4 +/- 1.9 13.2 +/- 4.6 16.8 +/- 0.3 17.4 +/- 0.3 12S3 17.9 +/- 2.2 16.7 +/- 3.2 21.5 +/- 0.1 22.2 +/- 3.2 12S7 12.7 +/- 0.7 10.5 +/- 0.3 14.7 +/- 1.6 15.4 +/- 0.2 13S2 15.5 +/- 2.3 18.4 +/- 3.4 22.7 +/- 2.1 23.2 +/- 1.5 13S5 18.5 +/- 0.4 19.2 +/- 0.7 21.8 +/- 1.9 23.5 +/- 0.7 13S6 16.5 +/- 2.5 18.3 +/- 1.7 21.4 +/- 0.4 19.2 +/- 2.2 14S5 15.9 +/- 0.9 18.3 +/- 0.1 18.1 +/- 1.1 19.9 +/- 0.6 15S5 17.0 +/- 0.9 16.3 +/- 1.7 19.1 +/- 2.1 17.1 +/- 1.5 16S1 21.5 +/- 0.9 26.8 +/- 0.1 27.0 +/- 0.9 25.9 +/- 2.1 16S2 18.8 +/- 0.9 15.5 +/- 0.8 18.1 +/- 0.7 21.5 +/- 3.0 See the comments at the end of this table.

C-7

TABLE C-4 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

First Quarter Second Quarter Third Quarter Fourth Quarter 1/5/2024 to 4/19/2024 4/19/2024 to 7/3/2024 7/3/2024 to 10/2/2024 10/2/2024 to 1/15/2025 LOCATION 0-1 MILE OFFSITE 6A4 16.4 +/- 1.4 20.1 +/- 0.0 16.2 +/- 1.8 16.5 +/- 2.6 8A3 13.6 +/- 0.6 13.6 +/- 1.8 17.8 +/- 1.0 16.2 +/- 0.3 11A1 14.4 +/- 2.3 14.8 +/- 0.9 17.3 +/- 0.4 17.3 +/- 0.2 15A3 11.3 +/- 0.4 11.1 +/- 0.5 14.3 +/- 0.4 14.9 +/- 1.2 16A2 9.3 +/- 1.5 11.0 +/- 1.3 15.4 +/- 1.5 13.1 +/- 0.9 1-2 MILES OFFSITE 8B2 11.8 +/- 1.5 11.1 +/- 0.8 13.8 +/- 1.1 15.4 +/- 1.6 9B1 11.9 +/- 1.0 11.0 +/- 0.1 12.7 +/- 0.0 14.1 +/- 0.1 10B3 10.7 +/- 1.4 14.0 +/- 1.9 14.3 +/- 0.1 14.6 +/- 0.9 3-4 MILES OFFSITE 1D5 13.3 +/- 3.3 17.8 +/- 1.7 16.5 +/- 3.2 14.7 +/- 0.7 8D3 11.0 +/- 0.7 14.8 +/- 5.0 14.7 +/- 0.6 14.4 +/- 1.8 9D4 12.3 +/- 1.5 12.0 +/- 1.5 17.1 +/- 0.3 17.6 +/- 0.4 10D1 11.3 +/- 0.5 9.7 +/- 1.0 14.8 +/- 1.8 16.3 +/- 1.0 12D2 15.9 +/- 1.0 20.3 +/- 2.3 21.8 +/- 1.2 20.2 +/- 2.6 14D1 12.4 +/- 0.9 12.8 +/- 1.6 15.3 +/- 2.0 17.8 +/- 0.6 4-5 MILES OFFSITE 3E1 10.2 +/- 1.4 11.4 +/- 2.0 12.2 +/- 0.6 13.3 +/- 0.8 4E2 15.6 +/- 0.9 13.0 +/- 2.8 15.4 +/- 0.7 16.7 +/- 1.2 5E2 12.9 +/- 2.3 16.0 +/- 1.5 15.0 +/- 1.9 15.3 +/- 2.4 6E1 13.7 +/- 1.9 12.8 +/- 6.0 16.8 +/- 0.7 (4)

(4) 7E1 14.4 +/- 0.0 13.3 +/- 1.5 15.2 +/- 1.3 14.4 +/- 0.3 11E1 9.5 +/- 1.4 6.4 +/- 3.4 13.3 +/- 0.4 11.0 +/- 0.1 12E1 10.8 +/- 2.9 11.1 +/- 0.0 13.8 +/- 0.3 14.0 +/- 0.8 13E4 12.5 +/- 1.4 14.4 +/- 1.2 17.9 +/- 1.8 20.2 +/- 0.7 See the comments at the end of this table.

C-8

TABLE C-4 ENVIRONMENTAL OPTICALLY STIMULATED LUMINESCENCE DOSIMETRY RESULTS SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results (1) are in mR/std. qtr (2) +/- 2 sigma (3)

First Quarter Second Quarter Third Quarter Fourth Quarter 1/5/2024 to 4/19/2024 4/19/2024 to 7/3/2024 7/3/2024 to 10/2/2024 10/2/2024 to 1/15/2025 LOCATION 5-10 MILES OFFSITE 2F1 12.0 +/- 2.2 12.0 +/- 0.3 14.3 +/- 1.6 15.0 +/- 0.1 15F1 15.6 +/- 2.5 16.2 +/- 4.0 19.1 +/- 2.8 18.6 +/- 0.1 16F1 16.4 +/- 0.3 16.3 +/- 1.5 17.1 +/- 0.6 18.7 +/- 0.4 10-20 MILES OFFSITE 3G4 15.9 +/- 2.9 14.0 +/- 2.2 17.7 +/- 0.9 15.5 +/- 0.7 4G1 16.3 +/- 0.5 14.1 +/- 2.8 16.5 +/- 1.1 14.9 +/- 0.7 7G1 8.4 +/- 0.6 11.4 +/- 0.9 12.7 +/- 0.2 11.7 +/- 1.0 12G1 10.1 +/- 1.1 10.4 +/- 0.8 13.8 +/- 0.1 13.6 +/- 0.9 12G4 12.6 +/- 0.4 13.7 +/- 0.7 14.5 +/- 0.6 16.1 +/- 0.2 See the comments at the end of this table.

LOCATION INDICATOR Average (5) 15.1 +/- 10.3 15.9 +/- 17.1 18.2 +/- 10.4 18.4 +/- 11.4 CONTROL Average (5) 12.7 +/- 3.2 12.7 +/- 3.8 15.1 +/- 1.6 14.4 +/- 1.7 COMMENTS 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 x is 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.

(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.

(1) Individual monitor location results are normally the average of the elemental doses of four elements from C-9

TABLE C-5 IODINE-131 AND GAMMA SPECTROSCOPIC ANALYSES OF MILK SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma COLLECTION SITE DATE I-131 K-40 Cs-134 Cs-137 Ba-140 La-140 Th-228 10G1 01/08/24

< 0.9 1351 +/- 175

< 8

< 9

< 32

< 11

< 17 02/05/24

< 0.8 1521 +/- 165

< 7

< 8

< 29

< 9

< 16 03/04/24

< 0.8 1520 +/- 166

< 8

< 25

< 11

< 13 04/08/24

< 0.8 1248 +/- 148

< 6

< 22

< 6

< 12 04/22/24

< 0.9 1415 +/- 135

< 5

< 21

< 7

< 9 05/06/24

< 0.9 1343 +/- 172

< 6

< 8

< 25

< 6

< 11 05/20/24

< 0.6 1380 +/- 166

< 6

< 7

< 31

< 8

< 14 06/03/24

< 0.8 1458 +/- 167

< 6

< 22

< 9

< 12 06/17/24

< 0.8 1336 +/- 164

< 6

< 7

< 25

< 10

< 14 07/01/24

< 0.8 1323 +/- 174

< 6

< 8

< 29

< 11

< 14 07/15/24

< 0.8 1279 +/- 176

< 6

< 7

< 29

< 9

< 13 07/29/24

< 0.8 1374 +/- 158

< 5

< 21

< 8

< 11 08/12/24

< 0.9 1250 +/- 168

< 5

< 8

< 26

< 10

< 14 08/25/24

< 0.9 1221 +/- 186

< 10

< 40

< 13

< 15 09/09/24

< 0.7 1235 +/- 154

< 6

< 7

< 27

< 7

< 15 09/22/24

< 0.9 1416 +/- 160

< 7

< 8

< 35

< 10

< 13 10/07/24

< 0.7 1308 +/- 190

< 6

< 8

< 34

< 12

< 17 10/20/24

< 0.9 1314 +/- 181

< 8

< 9

< 32

< 14

< 17 11/04/24

< 0.9 1338 +/- 174

< 7

< 25

< 7

< 13 12/09/24

< 0.8 1231 +/- 167

< 7

< 29

< 8

< 14 AVERAGE 1343 + 179 13E3 01/08/24

< 0.9 1239 +/- 150

< 10

< 8

< 32

< 10

< 16 02/05/24

< 0.7 1148 +/- 186

< 6

< 8

< 33

< 7

< 12 03/04/24

< 0.8 1524 +/- 168

< 6

< 8

< 24

< 9

< 13 04/08/24

< 0.9 942 +/- 212

< 8

< 7

< 26

< 9

< 12 04/22/24

< 0.8 1316 +/- 142

< 5

< 7

< 25

< 8

< 13 05/06/24

< 0.9 1087 +/- 142

< 6

< 7

< 26

< 8

< 11 05/20/24

< 0.7 1399 +/- 195

< 8

< 10

< 37

< 5

< 14 06/03/24

< 0.8 1335 +/- 173

< 8

< 7

< 26

< 10

< 12 06/17/24

< 0.9 1379 +/- 157

< 7

< 29

< 6

< 14 07/01/24

< 0.8 1216 +/- 191

< 6

< 8

< 35

< 14

< 14 07/15/24

< 0.7 1297 +/- 195

< 7

< 8

< 27

< 8

< 13 07/29/24

< 0.8 1211 +/- 200

< 6

< 28

< 10

< 13 08/12/24

< 0.9 1287 +/- 186

< 6

< 7

< 22

< 8

< 12 08/25/24

< 0.8 1274 +/- 169

< 7

< 9

< 31

< 9

< 13 09/09/24

< 0.9 1144 +/- 157

< 6

< 9

< 32

< 12

< 16 09/22/24

< 0.6 1101 +/- 164

< 8

< 35

< 9

< 14 10/07/24

< 0.7 1516 +/- 196

< 8

< 11

< 37

< 13

< 17 10/20/24

< 0.9 1337 +/- 164

< 6

< 8

< 31

< 7

< 13 11/04/24

< 0.9 1227 +/- 192

< 10

< 11

< 35

< 13

< 18 12/09/24

< 0.9 1229 +/- 173

< 5

< 7

< 26

< 7

< 13 AVERAGE 1260 + 281

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

C-10

TABLE C-5 IODINE-131 AND GAMMA SPECTROSCOPIC ANALYSES OF MILK SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma COLLECTION SITE DATE I-131 K-40 Cs-134 Cs-137 Ba-140 La-140 Th-228

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

5E2 01/08/24

< 0.9 1030 +/- 180

< 7

< 30

< 12

< 12 02/05/24

< 0.7 1269 +/- 191

< 7

< 9

< 34

< 9

< 14 03/04/24

< 0.8 1094 +/- 202

< 7

< 8

< 28

< 6

< 12 04/08/24

< 0.8 1271 +/- 159

< 6

< 7

< 21

< 9

< 11 04/22/24

< 0.8 1197 +/- 157

< 6

< 7

< 25

< 9

< 12 05/06/24

< 0.8 1110 +/- 122

< 5

< 6

< 22

< 7

< 11 05/20/24

< 0.8 1329 +/- 147

< 7

< 6

< 24

< 7

< 11 06/03/24

< 0.7 1362 +/- 173

< 7

< 8

< 31

< 8

< 15 06/17/24

< 0.9 1325 +/- 156

< 6

< 7

< 27

< 11

< 13 07/01/24

< 0.6 1110 +/- 179

< 6

< 7

< 31

< 7

< 13 07/15/24

< 0.8 1236 +/- 160

< 6

< 8

< 26

< 7

< 12 07/29/24

< 0.9 1251 +/- 180

< 7

< 8

< 28

< 11

< 12 08/12/24

< 0.9 1313 +/- 151

< 6

< 7

< 26

< 8

< 14 08/25/24

< 0.8 1214 +/- 165

< 8

< 7

< 30

< 11

< 13 09/09/24

< 0.6 1255 +/- 140

< 6

< 25

< 9

< 12 09/22/24

< 0.7 1157 +/- 181

< 6

< 11

< 41

< 11

< 17 10/07/24

< 0.7 1277 +/- 197

< 11

< 10

< 41

< 11

< 18 10/20/24

< 0.8 1069 +/- 146

< 7

< 27

< 11

< 14 11/04/24

< 0.8 1413 +/- 174

< 7

< 32

< 9

< 16 12/09/24

< 0.9 1279 +/- 129

< 4

< 5

< 17

< 7

< 10 AVERAGE 1228 + 208 C-11

TABLE C-6 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF GROUNDWATER Results in pCi/Liter +/- 2 sigma COLLECTION SITE DATE H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Th-228 2S8 01/26/24

< 353

< 105

< 9

< 24

< 8

< 16

< 11

< 14

< 12

< 9

< 8

< 40

< 11

< 15 04/12/24

< 363

< 151

< 6

< 8

< 17

< 8

< 19

< 9

< 15

< 14

< 7

< 8

< 35

< 12

< 16 07/09/24

< 372

< 138

< 7

< 21

< 8

< 16

< 8

< 13

< 12

< 6

< 7

< 35

< 12

< 16 10/16/24

< 269

< 124

< 7

< 6

< 13

< 9

< 13

< 7

< 10

< 14

< 5

< 7

< 34

< 11

< 14 AVERAGE 13S7 01/24/24

< 380

< 86

< 6

< 5

< 14

< 6

< 11

< 7

< 10

< 12

< 4

< 5

< 28

< 12

< 11 04/17/24

< 389

< 100

< 5

< 6

< 12

< 5

< 11

< 7

< 10

< 9

< 7

< 6

< 32

< 10

< 12 07/16/24

< 374

< 85

< 6

< 5

< 11

< 9

< 14

< 6

< 10

< 5

< 7

< 33

< 8

< 12 10/14/24

< 305

< 139

< 7

< 8

< 14

< 7

< 15

< 8

< 12

< 11

< 7

< 8

< 33

< 12

< 13 AVERAGE 1S3 01/24/24

< 352

< 119

< 7

< 5

< 18

< 7

< 16

< 8

< 11

< 13

< 8

< 34

< 9

< 16 04/17/24

< 370

< 101

< 7

< 6

< 18

< 6

< 15

< 7

< 11

< 9

< 6

< 5

< 31

< 10

< 11 07/16/24

< 376

< 112

< 8

< 5

< 16

< 8

< 11

< 7

< 13

< 11

< 6

< 7

< 31

< 13

< 12 10/11/24 251 +/- 167

< 78

< 6

< 5

< 13

< 6

< 16

< 7

< 10

< 14

< 5

< 6

< 33

< 14

< 10 AVERAGE 251 +/- 0 4S8 01/24/24

< 355

< 109

< 7

< 18

< 8

< 15

< 7

< 11

< 10

< 7

< 29

< 10

< 12 04/17/24

< 384

< 79

< 5

< 16

< 6

< 12

< 5

< 8

< 10

< 5

< 26

< 12

< 13 07/16/24

< 383

< 132

< 6

< 4

< 20

< 8

< 14

< 6

< 12

< 11

< 7

< 8

< 33

< 14

< 13 10/14/24 254 +/- 165

< 127

< 7

< 4

< 17

< 8

< 20

< 8

< 11

< 13

< 7

< 6

< 31

< 9

< 15 AVERAGE 254 +/- 0 4S9 01/26/24

< 355

< 127

< 7

< 20

< 6

< 15

< 6

< 10

< 9

< 7

< 23

< 10

< 13 04/12/24

< 372

< 105

< 5

< 11

< 5

< 9

< 5

< 8

< 9

< 5

< 23

< 8

< 11 07/09/24

< 374

< 113

< 7

< 15

< 7

< 15

< 7

< 15

< 11

< 6

< 7

< 27

< 10

< 12 10/16/24

< 270 354 +/- 96

< 8

< 6

< 20

< 6

< 18

< 9

< 13

< 7

< 8

< 33

< 14 47 +/- 10 AVERAGE 354 +/- 0 6S11A 01/26/24

< 359

< 109

< 8

< 6

< 19

< 6

< 13

< 9

< 15

< 11

< 7

< 33

< 8

< 13 04/11/24

< 374

< 119

< 9

< 7

< 15

< 4

< 14

< 10

< 15

< 13

< 7

< 9

< 35

< 13

< 14 07/08/24

< 379

< 90

< 5

< 7

< 20

< 6

< 8

< 6

< 10

< 9

< 5

< 26

< 11

< 12 10/16/24

< 267

< 132

< 6

< 8

< 21

< 9

< 17

< 8

< 13

< 14

< 6

< 8

< 38

< 15

< 16 AVERAGE

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

K-40 SUSQUEHANNA STEAM ELECTRIC STATION, 2024 C-12

TABLE C-6 TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF GROUNDWATER Results in pCi/Liter +/- 2 sigma COLLECTION SITE DATE H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Th-228

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

K-40 SUSQUEHANNA STEAM ELECTRIC STATION, 2024 6S12 01/25/24

< 395

< 72

< 5

< 7

< 15

< 6

< 12

< 6

< 9

< 6

< 25

< 9

< 13 04/11/24

< 372

< 123

< 7

< 6

< 18

< 6

< 16

< 7

< 13

< 11

< 6

< 7

< 30

< 13

< 14 07/08/24

< 384

< 132

< 8

< 15

< 8

< 10

< 7

< 12

< 10

< 5

< 6

< 25

< 9

< 12 10/14/24

< 250

< 106

< 8

< 7

< 20

< 8

< 17

< 8

< 13

< 7

< 9

< 38

< 12

< 14 AVERAGE 7S10 01/25/24

< 356

< 84

< 5

< 14

< 7

< 10

< 7

< 11

< 6

< 5

< 25

< 11

< 13 04/11/24

< 365

< 88

< 6

< 19

< 6

< 11

< 6

< 10

< 12

< 6

< 29

< 13

< 10 07/08/24

< 372

< 124

< 5

< 9

< 15

< 7

< 16

< 9

< 13

< 11

< 7

< 6

< 38

< 13

< 12 10/10/24

< 248

< 30

< 3

< 9

< 3

< 7

< 3

< 6

< 8

< 3

< 19

< 6

< 5 AVERAGE 7S11 01/25/24

< 353

< 115

< 6

< 19

< 8

< 14

< 7

< 11

< 13

< 7

< 5

< 28

< 9

< 15 04/11/24

< 359

< 100

< 6

< 7

< 13

< 6

< 11

< 6

< 10

< 9

< 5

< 32

< 12

< 11 07/08/24

< 377

< 106

< 7

< 5

< 16

< 6

< 10

< 6

< 11

< 9

< 5

< 26

< 8

< 11 10/10/24

< 240

< 24

< 3

< 9

< 3

< 6

< 3

< 5

< 7

< 3

< 18

< 6

< 6 AVERAGE 8S4 01/24/24

< 354

< 126

< 5

< 17

< 8

< 11

< 7

< 13

< 6

< 39

< 12

< 14 04/17/24

< 347

< 119

< 7

< 20

< 9

< 14

< 8

< 11

< 10

< 5

< 7

< 31

< 10

< 11 07/16/24 372 +/- 196

< 145

< 7

< 6

< 20

< 10

< 17

< 9

< 11

< 14

< 7

< 8

< 27

< 15

< 12 10/11/24

< 290

< 120

< 7

< 6

< 20

< 5

< 12

< 7

< 11

< 15

< 7

< 6

< 31

< 13

< 12 AVERAGE 372 +/- 0 1S4 01/24/24

< 354

< 97

< 5

< 11

< 4

< 9

< 5

< 8

< 10

< 5

< 25

< 9

< 10 04/17/24

< 361

< 118

< 6

< 13

< 6

< 13

< 6

< 11

< 13

< 6

< 7

< 31

< 10

< 13 07/16/24

< 372

< 152

< 7

< 6

< 17

< 6

< 17

< 7

< 10

< 13

< 7

< 6

< 33

< 12

< 14 10/11/24

< 250

< 62

< 3

< 11

< 4

< 9

< 4

< 6

< 8

< 3

< 4

< 21

< 8

< 7 AVERAGE C-13

TABLE C-7 ANNUAL AVERAGE TRITIUM CONCENTRATION IN PRECIPITATION, MONITORING WELLS AND LAKE TOOK-A-WHILE (LTAW) SURFACE WATER DATA SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma SITE 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Precip Sites 3S2**, 12S1**, 8G1** (offsite, controls) 62*

49 40 38 82 63 51 39 45 32 45 Precip Sites 1 and 2 (onsite, East of Station Reactor Bldgs) 370 230*

193 216 242 182 142 250 206 251 325 333 252 336 273 275 635 Precipitation Sites 3 and 4 (onsite, West of Station Reactor Bldgs) 414 404*

350 233 169 151 231 258 197 383 494 355 350 382 467 387 416 1S3 - MW-1 (43')

248 150 252 131 164 197 115 169 175 130 218 253 200 187 182 168 197 1S4 - Tap Water Sample Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled Not sampled 28 44

-17 41 160 4S8 - MW-2 (45')

292 154 190 173 137 202 187 138 154 138 191 196 239 194 282 106 189 4S9 - MW-3 (94')

127 54 150 64 80 135 94 180 125 55 109 92 77 86 102 205 104 8S4 - MW-4 (111')

172 66 105 68 81 109 60 162 145 91 102 155 96 109 181 148 180 7S10 - MW-5 (36')

171 69 96

-6 74 106 68 70 73 51 93 125 86 82 62 207 190 13S7 - MW-6 (16')

142 134 143 34 80 111 71 79 111 107 122 120 150 110 83 179 101 2S8 - MW-7 (85')

Not installed Not installed Not installed 22 54 72 70 70 74 56 37 71 63 35 86 62 95 6S11A - MW-8A (14')

177 82 165 58 15 72 103 110 63 38 50 83 72 48 30 44 41 6S11B - MW-8B (19')

Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well Dry well 6S12 - MW-9 (28')

30

-44 45 18 6

60 21 57 70 5

27 50 47 41 9

76 81 7S11 - MW-10 (132')

3

-27

-9 1

-1 23 29 55 13 1

33 16 3

7 23

-29 34

- 12F3 - Groundwater Control 26

-53

-2 5

-6 45

-26 20 41 61 82

- LTAW-Surface Water 179 104 110 132 132 145 27 73 89 77 135 20 65

Revised values to reflect full scope of precipitation data.

- Stations were discontinued after 5/30/18.

C-14

TABLE C-8 GROSS BETA, TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF DRINKING WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma COLLECTION PERIOD

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

SITE START STOP Gr-B K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 12H2 12/26/23 01/30/24

< 1.8

< 353

< 14

< 2

< 5

< 2

< 3

< 2

< 3

< 11

< 1

< 2

< 17

< 5 12H2 01/30/24 02/27/24 2.2 +/- 1.4

< 386

< 11

< 1

< 4

< 1

< 2

< 1

< 2

< 5

< 1

< 9

< 3 12H2 02/27/24 03/26/24

< 2.0

< 390

< 17

< 2

< 5

< 2

< 3

< 2

< 3

< 6

< 1

< 2

< 13

< 5 12H2 03/26/24 04/30/24 2.1 +/- 1.4

< 379

< 14

< 2

< 5

< 2

< 3

< 2

< 3

< 11

< 1

< 2

< 18

< 7 12H2 04/30/24 05/28/24

< 2.2

< 365

< 28

< 1

< 3

< 2

< 1

< 2

< 8

< 1

< 13

< 4 12H2 05/28/24 06/25/24

< 2.2

< 367

< 20

< 2

< 6

< 2

< 4

< 2

< 4

< 10

< 2

< 19

< 6 12H2 06/25/24 07/30/24 3.4 +/- 1.4

< 263 41 +/- 19

< 1

< 4

< 1

< 3

< 1

< 2

< 10

< 1

< 13

< 5 12H2 07/30/24 08/27/24 2.2 +/- 1.3

< 363

< 14

< 2

< 5

< 2

< 3

< 2

< 3

< 9

< 1

< 2

< 17

< 5 12H2 08/27/24 09/24/24

< 2.1

< 367

< 13

< 1

< 5

< 1

< 3

< 2

< 3

< 8

< 1

< 13

< 5 12H2 09/24/24 10/29/24

< 3.3

< 250

< 16

< 2

< 6

< 2

< 3

< 2

< 3

< 11

< 1

< 2

< 19

< 6 12H2 10/29/24 11/25/24 3.0 +/- 1.7

< 282

< 21

< 2

< 6

< 2

< 4

< 2

< 4

< 11

< 2

< 21

< 7 12H2 11/25/24 12/30/24

< 1.9

< 370

< 25

< 2

< 6

< 2

< 3

< 2

< 3

< 9

< 1

< 2

< 16

< 5 AVERAGE 2.6 + 1.2 41 +/- 0 H-3 C-15

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

SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/kg (wet) +/- 2 sigma COLLECTION SAMPLE SITE DATE TYPE Be-7 K-40 I-131 Cs-134 Cs-137 Ac-228 Th-228 11S6 07/09/24 Swiss Chard

< 215 2987 +/- 413

< 35

< 19

< 22

< 80

< 38 07/09/24 Collard

< 190 3464 +/- 446

< 29

< 19

< 91

< 32 08/12/24 Swiss Chard 381 +/- 205 2636 +/- 424

< 24

< 21

< 17

< 95

< 37 08/12/24 Collard 878 +/- 341 3219 +/- 487

< 29

< 19

< 27

< 103

< 45 09/09/24 Swiss Chard

< 237 3124 +/- 444

< 18

< 14

< 19

< 63

< 34 09/09/24 Collard

< 303 3996 +/- 587

< 33

< 27

< 26

< 91

< 44 10/09/24 Swiss Chard 323 +/- 140 2590 +/- 349

< 22

< 15

< 17

< 70

< 30 10/09/24 Collard

< 251 3674 +/- 436

< 30

< 19

< 21

< 86

< 37 AVERAGE 527 + 610 3211 + 976 C-16

TABLE C-10 GROSS BETA, TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF SURFACE WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma COLLECTION SITE PERIOD H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Th-228 6S6 12/26/23 - 01/30/24

< 370

< 34

< 2

< 6

< 2

< 4

< 2

< 4

< 15

< 2

< 22

< 7

< 4 01/30/24 - 02/27/24

< 398

< 47

< 3

< 4

< 11

< 4

< 7

< 4

< 6

< 14

< 3

< 28

< 11

< 6 02/27/24 - 03/26/24

< 398

< 15

< 2

< 5

< 2

< 3

< 2

< 3

< 7

< 1

< 2

< 12

< 4

< 3 03/26/24 - 04/30/24

< 2.1

< 391

< 18

< 1

< 4

< 1

< 2

< 1

< 2

< 8

< 1

< 13

< 5

< 2 04/30/24 - 05/28/24

< 2.2

< 371

< 29

< 2

< 7

< 2

< 4

< 2

< 4

< 13

< 2

< 21

< 9

< 3 05/28/24 - 06/25/24

< 2.3

< 381

< 13

< 1

< 2

< 5

< 2

< 3

< 2

< 3

< 8

< 1

< 15

< 5

< 3 06/25/24 - 07/30/24 2.8 +/- 1.5

< 270

< 26

< 2

< 5

< 2

< 3

< 2

< 3

< 12

< 1

< 2

< 20

< 6

< 3 07/30/24 - 08/27/24 4.4 +/- 1.6

< 379 36 +/- 17

< 1

< 4

< 1

< 3

< 2

< 3

< 8

< 1

< 14

< 5

< 2 08/27/24 - 09/24/24 2.7 +/- 1.6

< 375

< 15

< 1

< 2

< 5

< 2

< 3

< 2

< 3

< 8

< 1

< 14

< 5

< 3 09/24/24 - 10/29/24

< 2.5

< 254

< 28

< 2

< 6

< 2

< 3

< 2

< 4

< 13

< 2

< 20

< 7

< 3 10/29/24 - 11/25/24 3.4 +/- 1.7

< 297

< 18

< 2

< 6

< 2

< 4

< 2

< 4

< 11

< 2

< 18

< 6

< 3 11/25/24 - 12/30/24

< 1.9

< 375

< 10

< 1

< 4

< 1

< 2

< 1

< 2

< 7

< 1

< 11

< 4

< 2 AVERAGE 3.3 + 1.5 36 + 0 6S5 01/02/24 - 01/30/24

< 365

< 33

< 2

< 6

< 2

< 4

< 2

< 4

< 9

< 2

< 18

< 6

< 3 02/06/24 - 02/27/24

< 387

< 92

< 4

< 5

< 12

< 6

< 9

< 5

< 9

< 12

< 4

< 5

< 28

< 9

< 9 03/05/24 - 03/26/24

< 398

< 18

< 2

< 5

< 2

< 4

< 2

< 4

< 6

< 2

< 13

< 4

< 3 04/01/24 - 04/30/24

< 386

< 36

< 2

< 6

< 2

< 4

< 2

< 4

< 11

< 2

< 19

< 7

< 4 05/07/24 - 05/28/24

< 372

< 29

< 2

< 6

< 2

< 4

< 2

< 3

< 10

< 2

< 17

< 7

< 3 06/04/24 - 06/25/24

< 377

< 30

< 2

< 5

< 2

< 3

< 2

< 3

< 6

< 1

< 2

< 12

< 5

< 3 07/02/24 - 07/30/24

< 271

< 34

< 2

< 7

< 2

< 5

< 2

< 4

< 11

< 2

< 19

< 7

< 4 08/06/24 - 08/27/24

< 381

< 17

< 2

< 5

< 2

< 3

< 2

< 3

< 7

< 1

< 2

< 14

< 5

< 3 09/03/24 - 09/24/24

< 367

< 16

< 2

< 5

< 2

< 3

< 2

< 3

< 6

< 2

< 13

< 5

< 3 10/01/24 - 10/29/24

< 256

< 17

< 2

< 6

< 2

< 4

< 2

< 4

< 11

< 2

< 20

< 6

< 4 11/05/24 - 11/25/24

< 292

< 87

< 4

< 6

< 8

< 6

< 11

< 5

< 6

< 14

< 4

< 5

< 33

< 8

< 11 12/03/24 - 12/30/24

< 378

< 31

< 2

< 6

< 2

< 4

< 2

< 4

< 8

< 2

< 15

< 5

< 3 AVERAGE 4S7 01/29/24 - 01/29/24

< 361

< 101

< 7

< 14

< 11

< 17

< 8

< 11

< 8

< 9

< 28

< 10

< 12 05/02/24 - 05/02/24

< 386

< 113

< 6

< 7

< 10

< 8

< 10

< 7

< 11

< 10

< 7

< 5

< 26

< 8

< 12 07/15/24 - 07/15/24

< 376

< 110

< 6

< 7

< 20

< 8

< 16

< 7

< 13

< 8

< 7

< 36

< 13

< 12 10/11/24 10/11/24

< 289

< 64 4

< 5

< 14

< 5

< 10

< 5

< 7

< 8

< 4

< 18

< 10

< 7 AVERAGE

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

K-40 Gr-B C-17

TABLE C-10 GROSS BETA, TRITIUM AND GAMMA SPECTROSCOPIC ANALYSES OF SURFACE WATER SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/Liter +/- 2 sigma COLLECTION SITE PERIOD H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Th-228

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

K-40 Gr-B LTAW 01/29/24 - 01/29/24

< 391

< 113

< 8

< 7

< 18

< 6

< 13

< 7

< 11

< 8

< 7

< 25

< 8

< 12 05/02/24 - 05/02/24

< 393

< 147

< 7

< 8

< 14

< 6

< 13

< 6

< 13

< 8

< 5

< 7

< 23

< 11

< 12 07/15/24 - 07/15/24

< 349

< 85

< 6

< 14

< 6

< 11

< 7

< 10

< 6

< 5

< 29

< 12

< 8 10/11/24 10/11/24

< 252

< 78 5

< 5

< 14

< 5

< 11

< 5

< 9

< 12

< 4

< 6

< 24

< 11

< 9 AVERAGE 5S9 06/11/24 - 06/11/24

< 385

< 32

< 2

< 6

< 2

< 3

< 2

< 3

< 8

< 2

< 16

< 5

< 3 07/09/24 - 07/09/24

< 266

< 21

< 1

< 5

< 1

< 3

< 1

< 2

< 12

< 1

< 17

< 6

< 2 09/30/24 - 09/30/24

< 257

< 9

< 1

< 4

< 1

< 2

< 1

< 2

< 20

< 1

< 22

< 8

< 2 AVERAGE C-18

TABLE C-11 GAMMA SPECTROSCOPIC ANALYSIS OF FISH SUSQUEHANNA STEAM ELECTRIC STATION, 2024 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 05/03/24 2122 +/- 997

< 70

< 78

< 187

< 74

< 139

< 68

< 68 Shorthead Redhorse 05/03/24 3251 +/- 840

< 49

< 158

< 53

< 95

< 48

< 54 Smallmouth Bass 05/03/24 3456 +/- 903

< 64

< 60

< 146

< 68

< 138

< 61

< 68 Channel Catfish 10/25/24 3436 +/- 1219

< 65

< 73

< 236

< 64

< 100

< 45

< 66 Northern Hogsucker 10/25/24 2587 +/- 800

< 36

< 66

< 187

< 72

< 102

< 62

< 53 Smallmouth Bass 10/25/24 3016 +/- 1322

< 62

< 73

< 201

< 85

< 133

< 55

< 40 AVERAGE 2978 + 1058 IND Channel Catfish 05/02/24 4335 +/- 1268

< 73

< 80

< 144

< 77

< 165

< 72

< 66 Shorthead Redhorse 05/02/24 3900 +/- 1070

< 46

< 68

< 190

< 69

< 117

< 59

< 63 Smallmouth Bass 05/02/24 3679 +/- 810

< 57

< 49

< 151

< 49

< 112

< 57

< 61 Channel Catfish 10/24/24 2849 +/- 859

< 60

< 58

< 141

< 82

< 157

< 54

< 60 Smallmouth Bass 10/24/24 3446 +/- 995

< 63

< 70

< 191

< 60

< 157

< 62

< 64 Northern Hogsucker 10/25/24 4173 +/- 980

< 82

< 85

< 228

< 95

< 190

< 84

< 85 AVERAGE 3730 + 1077 LTAW Largemouth Bass 10/28/24 3923 +/- 884

< 43

< 50

< 164

< 51

< 100

< 47

< 55 Rainbow Trout 10/28/24 3346 +/- 1349

< 98

< 90

< 247

< 90

< 174

< 97

< 88 AVERAGE 3635 + 816 C-19

TABLE C-12 GAMMA SPECTROSCOPIC ANALYSES OF SHORELINE SEDIMENT SUSQUEHANNA STEAM ELECTRIC STATION, 2024 Results in pCi/kg (dry) +/- 2 sigma COLLECTION SITE DATE K-40 Cs-134 Ac-228 Th-228 2B 04/01/24 10370 +/- 1429

< 72

< 75 4211 +/- 1715 1225 +/- 264 738 +/- 132 11/05/24 10450 +/- 2147

< 99

< 111

< 1742 881 +/- 425 982 +/- 176 AVERAGE 10410 + 113 4211 +/- 0 1053 + 487 860 + 344 7B 04/01/24 6594 +/- 1136

< 51

< 78

< 1414 768 +/- 295 548 +/- 108 11/05/24 7370 +/- 1204

< 85

< 97

< 1791 713 +/- 275 873 +/- 175 AVERAGE 6982 + 1097 740 + 78 710 + 461 12F 04/01/24 6617 +/- 1579

< 72

< 78

< 1818 871 +/- 283 699 +/- 134 11/05/24 6843 +/- 1336

< 62

< 70

< 1121 575 +/- 244 478 +/- 108 AVERAGE 6730 + 320 723 + 419 588 + 311 Cs-137 Ra-226 C-20

0 50 100 150 200 250 300 350 400 450 500 FIGURE C GROSS BETA ACTIVITY IN AIR PARTICULATES Indicator Control PRE-OP OPERATIONAL A

E B

C D

F Unit 2 Criticality 05/08/1984 CHERNOBYL 4/26/86 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 Unit 1 Criticality 09/10/1982 E-3 pCi/m3 C-21 1974 :r--==~=-iiiic=:i:iiiiiiiiiiiiii.;.;;;;;;;;;-1--.==----1-----'-7 1975 1976 1977 1978 1979 1980

+--

1981 1-==::::::==------------,

1982 t::

1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 I ~ --------------~

2025 L:

0 5

10 15 20 25 30 35 40 45 50 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 2017 2019 2021 2023 2025 Dose Rate (mrem/STD Qtr)

FIGURE C AMBIENT RADIATION LEVELS BASED ON ENVIRONMENTAL DOSIMETRY DATA Indicator Control PRE-OP OPERATIONAL Unit 2 Criticality 05/08/1984 Unit 1 Criticality 09/10/1982 Changed from TLD to OSLD system 01/18/2012 C-22

\\J

\\

0 10 20 30 40 50 60 70 80 90 100 pCi/L FIGURE C IODINE-131 ACTIVITY IN MILK Indicator Control PRE-OP OPERATIONAL A

B C

CHERNOBYL 4/26/86 Unit 2 Criticality 05/08/1984 CHINESE WEAPONS TEST A - 09/12/77 B - 03/14/78 C - 10/15/80 Unit 1 Criticality 09/10/1982 C-23 I

\\

I l !

~

I I

m

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

-100 0

100 200 300 400 500 600 700 800 900 1000 1100 1200 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Investigation Level MDC Condition Report Threshold (surface/groundwater sample result)

Minimum Detectable Concentration pCi/L C-24

~'3~ t #-~ #~ #:, #>- #-t> #~ #~

~

~

"!<..~

v"'

-~s

~

~,(,,~ -

0 1

2 3

4 5

6 7

8 9

10 pCi/L FIGURE C GROSS BETA ACTIVITY IN DRINKING WATER PRE-OP OPERATIONAL Unit 2 Criticality 05/08/1984 Unit 1 Criticality 09/10/1982 C-25 I;

(\\I\\

~ ~I\\..,,

s,'-

~

s,",

~

s,">

~

~ ~%..,,

~'\\-

~

~"'

~

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~

~"

~

~..,,..,, ~"

~~

~"'

~">

~" ~~..,, ~"

~

~~

'V

~~

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~ ~~

~~

'V

~'\\-

~~

~"'

~~

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~~

-500 500 1500 2500 3500 pCi/L FIGURE C TRITIUM ACTIVITY IN SURFACE WATER Indicator Control PRE-OP OPERATIONAL Unit 2 Criticality 05/08/1984 Unit 1 Criticality 09/10/1982 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 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Ratio of TBE to Analytics Result Evaluation (b)

March 2024 E14089 Milk Sr-89 pCi/L 79.6 78.2 1.02 A

Sr-90 pCi/L 12.6 11.9 1.06 A

E14090 Milk Ce-141 pCi/L 75.6 85.0 0.89 A

Co-58 pCi/L

-0.069 Not Measured Co-60 pCi/L 139 158 0.88 A

Cr-51 pCi/L 212 230 0.92 A

Cs-134 pCi/L 167 198 0.84 A

Cs-137 pCi/L 158 171 0.93 A

Fe-59 pCi/L 81.1 86.5 0.94 A

I-131 pCi/L 80.9 90.8 0.89 A

Mn-54 pCi/L 173 183 0.95 A

Zn-65 pCi/L 165 176 0.93 A

E14091 Charcoal I-131 pCi 90.1 90.3 1.00 A

E14092 AP Ce-141 pCi 68.1 67.5 1.01 A

Co-58 pCi 1.73 Not Measured Co-60 pCi 168 126 1.34 N(1)

Cr-51 pCi 182 183 0.99 A

Cs-134 pCi 157 157 1.00 A

Cs-137 pCi 132 136.0 0.97 A

Fe-59 pCi 70.3 68.6 1.02 A

Mn-54 pCi 144 145 0.99 A

Zn-65 pCi 125 140 0.89 A

E14093 Soil Ce-141 pCi/g 0.106 0.071 1.48 N(1)

Co-58 pCi/g

-0.005 Not Measured Co-60 pCi/g 0.121 0.133 0.91 A

Cr-51 pCi/g 0.198 0.194 1.02 A

Cs-134 pCi/g 0.206 0.166 1.24 W

Cs-137 pCi/g 0.207 0.209 0.99 A

Fe-59 pCi/g 0.063 0.073 0.87 A

Mn-54 pCi/g 0.140 0.153 0.91 A

Zn-65 pCi/g 0.149 0.148 1.01 A

E14094 AP Sr-89 pCi 83.9 90.6 0.93 A

Sr-90 pCi 11.7 13.8 0.85 A

September 2024 E14095 Milk Sr-89 pCi/L 88.0 92.3 0.95 A

Sr-90 pCi/L 12.4 15.2 0.82 A

E14096 Milk Ce-141 pCi/L 124 124 1.00 A

Co-58 pCi/L 154 150 1.03 A

Co-60 pCi/L 232 236 0.98 A

Cr-51 pCi/L 284 274 1.04 A

Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services D-2

Table D-1 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Ratio of TBE to Analytics Result Evaluation (b)

E14096 Milk (Cont'd)

Cs-134 pCi/L 180.0 187 0.96 A

Cs-137 pCi/L 126 127 0.99 A

Fe-59 pCi/L 127.0 113 1.12 A

I-131 pCi/L 85.3 89.0 0.96 A

Mn-54 pCi/L 162 162 1.00 A

Zn-65 pCi/L 294 275 1.07 A

E14097 Charcoal I-131 pCi 98.8 92.6 1.07 A

E14098 AP Ce-141 pCi 82.0 76.7 1.07 A

Co-58 pCi 91.0 92.6 0.98 A

Co-60 pCi 180 146 1.23 W

Cr-51 pCi 208 170 1.22 W

Cs-134 pCi 116 116 1.00 A

Cs-137 pCi 83.1 78.9 1.05 A

Fe-59 pCi 75.6 70.2 1.08 A

Mn-54 pCi 101 100 1.01 A

Zn-65 pCi 167 170 0.98 A

E14099 Soil Ce-141 pCi/g 0.224 0.222 1.01 A

Co-58 pCi/g 0.249 0.268 0.93 A

Co-60 pCi/g 0.420 0.423 0.99 A

Cr-51 pCi/g 0.492 0.492 1.00 A

Cs-134 pCi/g 0.278 0.336 0.83 A

Cs-137 pCi/g 0.276 0.295 0.94 A

Fe-59 pCi/g 0.233 0.204 1.14 A

Mn-54 pCi/g 0.279 0.290 0.96 A

Zn-65 pCi/g 0.538 0.494 1.09 A

E14100 AP Sr-89 pCi 79.8 82.7 0.96 A

Sr-90 pCi 12.0 13.6 0.88 A

E14197 Liquid Gr-A (Am241) pCi/L 47.6 50.1 0.95 A

Gr-B (Cs137) pCi/L 248 270 0.92 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 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services D-3

Table D-2 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Range Evaluation (b)

February 2024 24-MaS50 Soil Fe-55 Bq/kg 297 650 455 - 845 N(3)

Ni-63 Bq/kg 1070 1530 1071 - 1989 N(4)

Tc-99 Bq/kg 325 336 235 - 437 A

Th-228 Bq/kg 34.6 48.8 34.2 - 63.4 W

Th-230 Bq/kg 49.7 54.0 38.0 - 70.0 A

Th-232 Bq/kg 36.4 45.1 31.6 - 58.6 A

24-MaSU50 Urine Cs-134 Bq/L 1.12 1.36 0.95-1.77 A

Cs-137 Bq/L 2.00 2.23 1.56-2.90 A

Co-57 Bq/L 1.06 1.26 0.88 - 1.64 A

Co-60 Bq/L 2.26 2.38 1.67 - 3.09 A

K-40 Bq/L

-1.80 NR Mn-54 Bq/L 1.44 1.51 1.06 - 1.96 A

U-234 Bq/L 0.00101 (1)

A U-238 Bq/L 0.00228 (1)

A Zn-65 Bq/L

-0.42 0.84 0.59-1.09 NE(5) 24-MaW50 Water Ni-63 Bq/L 0.338 0.80 (2)

A Tc-99 Bq/L 9.95 7.47 5.23 - 9.71 N(6) 24-RdV50 Vegetation Cs-134 Bq/sample 2.80 3.67 2.57 - 4.77 W

Cs-137 Bq/sample 2.21 2.57 1.80 - 3.34 A

Co-57 Bq/sample 2.23 2.53 1.77 - 3.29 A

Co-60 Bq/sample 2.42 2.96 2.07 - 3.85 A

Mn-54 Bq/sample 0.033 (1)

A Sr-90 Bq/sample 0.276 0.529 0.370 - 0.688 N(7)

Zn-65 Bq/sample 6.83 8.02 5.61 - 10.43 A

August 2024 24-MaS51 Soil Fe-55 Bq/kg (8) 780 546-1014 N(9)

Ni-63 Bq/kg 1140.00 1450.00 1015 - 1885 W

Tc-99 Bq/kg 155.00 171.00 120 - 222 A

Th-228 Bq/kg 38.00 43.30 30.3 - 56.3 A

Th-230 Bq/kg 46.10 44.00 30.8 - 57.2 A

Th-232 Bq/kg 38.90 42.60 29.8 - 55.4 A

24-MaW51 Water Ni-63 Bq/L 0.60 (1)

A Tc-99 Bq/L 11.90 11.20 7.8 - 14.6 A

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services D-4

Table D-2 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Range Evaluation (b) 24-RdV51 Vegetation Cs-134 Bq/sample 3.12 2.89 2.02 - 3.76 A

Cs-137 Bq/sample 2.18 1.91 1.34 - 2.48 A

Co-57 Bq/sample 0.00 (1)

A Co-60 Bq/sample 2.24 2.01 1.41 - 2.61 A

Mn-54 Bq/sample 3.76 3.53 2.47 - 4.59 A

Sr-90 Bq/sample 0.95 2.39 1.67 - 3.11 N(10)

Zn-65 Bq/sample 10.30 9.13 6.39 - 11.87 A

(a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurement made during standard preparation (b) DOE/MAPEP 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 CAR 23-31 (4) See NCR 24-08 (5) Not Evaluated, re-reported as False Pos by MAPEP (6) See NCR 24-10 (7) See NCR 24-11 (8) Not Reported (9) See NCR 24-16 (10) See NCR 24-17 Teledyne Brown Engineering Environmental Services DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

D-5

Table D-3 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Limits Evaluation (b)

March 2024 MRAD-40 Water Am-241 pCi/L 101 139 95.4 - 178 A

Fe-55 pCi/L 2185 2480 1460- 3610 A

Pu-238 pCi/L 62.0 70.4 42.3 - 91.2 A

Pu-239 pCi/L 61.2 76.5 47.3 - 94.3 A

Soil Am-241 pCi/kg NR 1880 1020 - 2660 Pu-238 pCi/kg 667 512 255 - 778 A

Pu-239 pCi/kg 562 545 297 - 784 A

Sr-90 pCi/kg 4050 3630 1130 - 5650 A

U-234 pCi/kg 3040 4360 2040 - 5710 A

U-238 pCi/kg 3270 4320 2370 - 5800 A

AP Am-241 pCi/filter 38.8 55.0 39.3 - 73.3 N(1)

Fe-55 pCi/filter 387 386 141 - 616 A

Pu-238 pCi/filter 45.9 41.1 31.0 - 50.5 A

Pu-239 pCi/filter 54.9 56.1 41.9 - 67.7 A

U-234 pCi/filter 11.1 11.6 8.60 - 13.6 A

U-238 pCi/filter 12.8 11.5 8.68 - 13.7 A

GR-A pCi/filter 116 95.9 50.1 - 158 A

GR-B pCi/filter 42.1 22.2 13.5 - 33.5 N(2)

April 2024 RAD-137 Water Ba-133 pCi/L 62.8 65.9 50.1 - 81.7 A

Cs-134 pCi/L 51.0 57.8 42.8 - 72.8 A

Cs-137 pCi/L 153 186 149 - 223 A

Co-60 pCi/L 92.1 98.8 79.7 - 118 A

Zn-65 pCi/L 208 240 188 - 292 A

GR-A pCi/L 35.2 52.6 39.6 - 65.6 N(3)

GR-B pCi/L 49 46.5 33.9 - 59.1 A

U-Nat pCi/L 56.0 59.3 52.8-65.8 A

H-3 pCi/L 19,000 21,300 18,200 - 24,400 A

Sr-89 pCi/L 48.9 52.2 37.8 - 66.6 A

Sr-90 pCi/L 32.6 37.6 32.0 - 43.2 A

I-131 pCi/L 21.8 25.1 21.7 - 28.5 A

September 2024 MRAD-41 Water Am-241 pCi/L 108.0 117.0 80.3-150 A

Fe-55 pCi/L 615 1230 723-1790 N(4)

Pu-238 pCi/L 99 103 61.9-133 A

Pu-239 pCi/L 123 133 82.3-164 A

ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services D-6

Table D-3 Month/Year Identification Number Matrix Nuclide Units TBE Reported Value Known Value (a)

Acceptance Limits Evaluation (b)

September 2024 MRAD-41 Soil Am-241 pCi/kg 1320 1110 599-1570 A

Pu-238 pCi/kg 1380 1860 928-2830 A

Pu-239 pCi/kg 796 1030 561-1480 A

Sr-90 pCi/kg 3240 4730 1470-7370 A

U-234 pCi/kg 2540 2860 1340-3750 A

U-238 pCi/kg 2390 2840 1560-3810 A

AP Am-241 pCi/filter 27.0 29.1 20.8-38.8 A

Fe-55 pCi/filter 644 800 292-1280 A

Pu-238 pCi/filter 22.3 21.5 16.2-26.4 A

Pu-239 pCi/filter 30.6 32.4 24.2-39.1 A

U-234 pCi/filter 14.0 31.1 23.1-36.4 N(5)

U-238 pCi/filter 14.2 30.9 23.3-36.9 N(5)

GR-A pCi/filter 80.0 72.4 37.8-119 A

GR-B pCi/filter 57.5 47.9 29.0-72.4 A

October 2024 RAD-139 Water Ba-133 pCi/L 30.3 27.4 15.5-39.3 A

Cs-134 pCi/L 73.3 80.2 63.0-97.4 A

Cs-137 pCi/L 46.6 46.3 23.3-69.3 A

Co-60 pCi/L 44.2 45.3 31.6-59.0 A

Zn-65 pCi/L 104 114.0 75.0-153 A

GR-A pCi/L 47.6 51.7 38.9-64.5 A

GR-B pCi/L 44.2 48.1 35.2-61.0 A

U-Nat pCi/L 28.3 26.90 23.6-30.2 A

H-3 pCi/L 4,690 5,320 3870-6770 A

Sr-89 pCi/L 57.5 44.2 30.6-57.8 A

Sr-90 pCi/L 37.3 35.6 30.2-41.0 A

I-131 pCi/L 28.3 26.3 22.7-29.9 A

(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 24-02 (2) See NCR 24-03 (3) See NCR 24-05 (4) See NCR 24-15 Teledyne Brown Engineering Environmental Services ERA Environmental Radioactivity Cross Check Program D-7

APPENDIX E REMP SAMPLE EQUIPMENT OPERABILITY TRENDING E-1

SAMPLING MEDIA SAMPLE LOCATION DESCRIPTION 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Air Particulate 3S2 SSES Backup Met. Tower 100 99 100 99.9 99.9 100.0 99.4 99.9 95.5 99.7 99.9

& Charcoal 12S1 West Building 100 100 100 99.1 99.7 99.9 99.9 99.9 99.7 98.1 98.0 13S6 Former Laydown Area, West of Confers Lane 100 97 100 100 99.9 99.9 99.9 99.9 99.9 100.0 99.7 12E1 Berwick Hospital 100 98 99.1 100 100 100 100.0 100 100 100 99.9 8G1 PPL System Facilities Center, Humboldt Industrial Park 100 100 99.2 99.9 99.9 99.9 99.9 99.9 100 100 98.8 10S3 E of Confers Lane, S of Towers Club 100 99.5 99.9 99.2 98.9 99.9 99.7 99.9 98.6 9B1 Transmission Line, E of Route 11 100 99.9 99.9 99.9 100.0 99.9 99.9 99.9 99.9 Drinking Water 12H2 Danville Water Company 100 100 100 100 100 98.1 100.0 100 100.0 100.0 99.9 Surface Water 6S6 River Water Intake Line 93 98 99.7 99.9 99.9 99.9 88.1***

94.0 99.4 94.0 99.9 TABLE E-1 REMP SAMPLING EQUIPMENT OPERABILITY TRENDING SUSQUEHANNA STEAM ELECTRIC STATION Percent (%) Operability E-2

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