ML21147A319

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Independent Spent Fuel Storage Installation (ISFSI) - Annual Radiological Environmental Operating Report 76 January 1, 2020 Through December 31, 2020
ML21147A319
Person / Time
Site: Peach Bottom  Constellation icon.png
Issue date: 05/24/2021
From: Henry D
Exelon Generation Co LLC
To:
Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
Download: ML21147A319 (133)
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Text

Exelon Generation!

May 24, 2021 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001 Peach Bottom Atomic Power Station Units 2 and 3 Independent Spent Fuel Storage Installation (ISFSI)

Facility Operation License DPR-12, DPR-44 and DPR-56 NRC Docket 50-171, 50-277 and 50-278 and ISFSI Docket 72-29

Subject:

Annual Radiological Environmental Operating Report 76 January 1, 2020 through December 31, 2020 In accordance with the requirements of Section 5.6.2 of the Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3 Technical Specifications, this letter submits the Annual Radiological Environmental Operation Report 78. This report provides the 2020 results for the Radiological Environmental Monitoring Program (REMP) as called for in the Offsite Dose Calculation Manual.

In assessing the data collected for the REMP, we have concluded that the operation of PBAPS, Units 2 and 3, had no adverse impact on the environment. There are no commitments contained in this letter.

If you have any questions or require additional information, please do not hesitate to contact Dani Brookhart at 717-456-3056.

Sincerely,

=== ~~__,../~

David A. Henry, Plant Manager Peach Bottom Atomic Power Station DAH/M R/SMO/TJH/KH/DLB Enclosure (1)

Cc: Regional Administrator - NRC Region 1 NRC Senior Resident Inspector - Peach Bottom Atomic Power Station CCN 21-34

Docket No: 50-277 50-278 PEACH BOTTOM ATOMIC POWER STATION UNITS 2 and 3 Annual Radiological Environmental Operating Report Report No. 77 January 1 through December 31, 2020 Prepared By Teledyne Brown Engineering Environmental Services Peach Bottom Atomic Power Station Delta, PA 17314 May 2021

Intentionally Left Blank TABLE OF CONTENTS I. Executive Summary ......................................................................................................... 1 II. Introduction...................................................................................................................... 3 A. Objectives ............................................................................................................ 3 B. Implementation of the Objectives ........................................................................ 3 C. Radiation and Radioactivity ................................................................................. 3 D. Sources of Radiation ........................................................................................... 4 III. Program Description....................................................................................................... 6 A. Sample Collection ................................................................................................ 6 B. Sample Analysis .................................................................................................. 8 C. Data Interpretation ............................................................................................... 8 D. Program Exceptions .......................................................................................... 10 IV. Program Changes........................................................................................................ 10 V. Results and Discussion ................................................................................................ 11 A. Aquatic Environment ......................................................................................... 11 B. Atmospheric Environment ................................................................................. 13 C. Terrestrial .......................................................................................................... 13 D. Ambient Gamma Radiation ............................................................................... 14 E. Independent Spent Fuel Storage Installation (ISFSI) ........................................ 15 F. Land Use Census .............................................................................................. 15 G. Errata Data ........................................................................................................ 16 H. Secondary Laboratory Analysis ......................................................................... 16 I. Summary of Results - Quality Control (QC) Laboratory Analysis..................... 17 VI. References .................................................................................................................. 19 i

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Peach Bottom Atomic Power Station, 2020 Appendix B Sample Designation and Locations Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2020 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Peach Bottom Atomic Power Station, 2020 Figures Figure B-1 Environmental Sampling Locations Within One Mile of Peach Bottom Atomic Power Station, 2020 Figure B-2 Environmental Sampling Locations Between One and Approximately Five Miles of Peach Bottom Atomic Power Station, 2020 Figure B-3 Environmental Sampling Locations Greater than Five Miles from Peach Bottom Atomic Power Station, 2020 Appendix C Data Tables and Figures Primary Laboratory Tables Table C-I.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-I.2 Concentrations of Low Level I-131 in Surface Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-I.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-II.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-II.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 ii

Table C-II.3 Concentrations of Low Level I-131 in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-II.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-III.1 Concentrations of Gamma Emitters in Predator and Bottom Feeder (Fish) Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-V.2 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-VI.1 Concentrations of I-131 in Air Iodine Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-VII.1 Concentrations of Low Level I-131 in Milk Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-VIII.1 Concentrations of Gamma Emitters in Food Product Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table C-IX.1 Quarterly DLR Results for Peach Bottom Atomic Power Station, 2020 Table C-IX.2 Annual DLR Results for Peach Bottom Atomic Power Station, 2020 Figures Figure C-1 Monthly Total Gross Beta Concentrations in Drinking Water Samples Collected in the Vicinity of PBAPS, 2020 Figure C-2 MDC Results for Fish Sampling Collected in the Vicinity of PBAPS, 2020 Figure C-3 Semi-Annual Cs-137 Concentrations in Sediment Samples Collected in the Vicinity of PBAPS, 2020 Figure C-4 Mean Weekly Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of PBAPS, 2020 Figure C-5 Average Monthly MDC for REMP Milk Samples Collected in the Vicinity of PBAPS, 2020 Figure C-6 Annual Normalized Gamma Radiation Results from Dosimeters Collected in the Vicinity of PBAPS, 2020 iii

Appendix D Data Tables and Figures QC Laboratories Tables Table D-I.1 Concentrations of Gross Beta in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-I.2 Concentrations of Tritium in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-I.3 Concentrations of I-131 in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-I.4 Concentrations of Gamma Emitters in Drinking Water Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-II.1 Concentrations of Gross Beta in Air Particulate and I-131 in Air Iodine Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-II.2 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Table D-III.1 Concentrations of I-131 and Gamma Emitters in Milk Samples Collected in the Vicinity of Peach Bottom Atomic Power Station, 2020 Figures Figure D-1 Comparison of Monthly Total Gross Beta Concentrations in Drinking Water Samples from Station 4L Analyzed by the Primary and QC Laboratories, 2020 Figure D-2 Comparison of Weekly Gross Beta Concentrations from Co-Located Air Particulate Locations (1Z/1A) Analyzed by the Primary and QC Laboratories, 2020 Appendix E Errata Data Appendix F Inter-Laboratory Comparison Program Acceptance Criteria and Results Tables Table F-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2020 Table F-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2020 Table F-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2020 iv

Table F-4 Analytics Environmental Radioactivity Cross Check Program Exelon Industrial Services, 2020 Table F-5 ERA Environmental Radioactivity Cross Check Program Exelon Industrial Services, 2020 Table F-6 Analytics Environmental Radioactivity Cross Check Program GEL Laboratories (Relevant Nuclides), 2020 Table F-7 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

GEL Laboratories (Relevant Nuclides), 2020 Table F-8 ERA Environmental Radioactivity Cross Check Program GEL Laboratories (Relevant Nuclides), 2020 Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) v

Intentionally Left Blank I. Executive Summary The 2020 Annual Radiological Environmental Operating Report (AREOR) describes the results of the Radiological Environmental Monitoring Program (REMP) conducted for Peach Bottom Atomic Power Station (PBAPS) by Exelon Nuclear and covers the period of 1 January 2020 through 31 December 2020. Throughout that time period, 1,267 analyses were performed on 981 samples. In assessing all the data gathered for this report and comparing the results with preoperational data, it was evident that the operation of PBAPS had no adverse radiological impact on the environment.

The various media collected in the REMP include aquatic, terrestrial, airborne, and ambient radiation. The corresponding analyses performed on the collected specimen were:

Aquatic:

  • Surface water samples were analyzed for concentrations of Iodine-131 (I-131), tritium (H-3) and gamma-emitting nuclides. All nuclides were below minimum detectable activity.
  • Drinking water samples were analyzed for concentrations of gross beta, I-131, H-3, and gamma-emitting nuclides. All nuclides were below minimum detectable activity. In some samples, gross beta activity detected was detected above the lower limit of detection (LLD) of 4 pCi/L, but not above the investigation level (15 pCi/L) and therefore, likely due to background radiation.
  • Fish and sediment samples were analyzed for concentrations of gamma-emitting nuclides. All nuclides were below minimum detectable activity.

Terrestrial:

  • Milk samples were analyzed for low level concentrations of I-131 and gamma-emitting nuclides. Food product samples were analyzed for concentrations of gamma-emitting nuclides. All power production nuclides were below minimum detectable activity.

Airborne:

  • Air particulates and air iodine samples were analyzed for gross beta, gamma-emitting nuclides, and low level I-131. All nuclides were below minimum detectable activity. The gross beta results were less than the investigation level (1.60E-01 pCi/m3) and there were no notable differences between control and indicator locations.

Ambient Radiation:

  • Ambient gamma radiation levels were measured quarterly. There was no detectable ambient gamma radiation levels to the members of the public at offsite locations, indicating no impact from plant operations. The nearest resident to the ISFSI saw no detectable ambient gamma radiation levels, therefore ISFSI operations did not have an impact to members of the public.

In 2020, the doses from both liquid and gaseous effluents were conservatively calculated for the Maximum Exposed Member of the Public due to PBAPS Operation. Doses calculated were well below all Offsite Dose Calculations Manual (ODCM) limits. The results of those calculations were as follows:

Location  % of Applicable Estimated Age Effluent Distance Direction Applicable Limit Unit Organ Dose Group (meters) (toward) Limit Gamma -

Noble Gas 1.60E-01 All 1.10E+03 SSE 8.00E-01 2.00E+01 mrad Air Dose Beta - Air Noble Gas 1.09E-01 All 1.10E+03 SSE 2.73E-01 4.00E+01 mrad Dose Total Body Noble Gas 1.55E-01 All 1.10E+03 SSE 1.55E+00 1.00E+01 mrem (gamma)

Noble Gas Skin (Beta) 2.04E-01 All 1.10E+03 SSE 6.80E-01 3.00E+01 mrem Gaseous Iodine, Particulate, Bone 1.40E-01 Child 1.50E+03 SW 4.67E-01 3.00E+01 mrem Carbon-14

& Tritium Gaseous Iodine, Thyroid 4.30E-03 Infant 1.50E+03 SW 1.43E-02 3.00E+01 mrem Particulate,

& Tritium Total Body Liquid 1.54E-04 Child 2.57E-03 6.00E+00 mrem (gamma)

Site Boundary Liquid GI-LLI 3.47E-04 Adult 1.74E-03 2.00E+01 mrem Direct Total Body 0.00E+00 All 1.19E+03 SSE 0.00E+00 2.50E+01 mrem Radiation 40 CFR Part 190 Compliance Location  % of Applicable Estimated Age Effluent Distance Direction Applicable Limit Unit Organ Dose Group (meters) (toward) Limit Total Dose Total Body 1.55E-01 All 1.19E+03 SSE 6.21E-01 2.50E+01 mrem Total Dose Thyroid 4.30E-03 All 1.19E+03 SSE 5.73E-02 7.50E+01 mrem Total Dose Bone 1.40E-01 All 1.19E+03 SSE 5.61E-01 2.50E+01 mrem Total Dose Total Body 1.55E-01 All 1.19E+03 SSE 5.17E+00 3.00E+00 mrem Total Dose Bone 1.40E-01 All 1.19E+03 SSE 4.68E+00 3.00E+00 mrem Total Dose Thyroid 1.64E-01 All 1.19+03 SSE 2.99E-01 5.50E+01 mrem II. Introduction PBAPS is located along the Susquehanna River between Holtwood and Conowingo Dams in Peach Bottom Township, York County, Pennsylvania. PBAPS Units 2 and 3 are boiling water reactors, each with a rated full-power output of approximately 4,016 MWth while Unit 1 is a decommissioned 115 MWth High Temperature, Gas-cooled Reactor (HTGR). The initial environmental monitoring program began 5 February 1966.

A summary of the Unit 1 preoperational monitoring program was presented in a previous report (1). Preoperational summary reports (2,3) for Units 2 and 3 have been previously issued and summarize the results of all analyses performed on samples collected from 5 February 1966 through 8 August 1973.

The sampling and analysis requirements are contained in the PBAPS ODCM and the ODCM Specifications (ODCMS). This AREOR covers those analyses performed by Teledyne Brown Engineering (TBE), Landauer, Exelon Industrial Services (EIS) and GEL Laboratories on samples collected during the period 01 January 2020 through 31 December 2020.

A. Objectives The objectives of the REMP are:

1. Provide data on measurable levels of radiation and radioactive materials in the publicly-used environs;
2. Evaluate the principal pathways of exposure to the public as described in the ODCM and determine the relationship between quantities of radioactive material released from the plant and resultant radiation doses to members of the public.

B. Implementation of the Objectives Implementation of the objectives is accomplished by:

1. Identifying significant exposure pathways,
2. Establishing baseline radiological data of media within those pathways,
3. Continuously monitoring those media before and during plant operation to assess station radiological effects (if any) on man and the environment.

As the REMP is established to measure the impact of power plant operations (release of radionuclides) on man and the environment; it is important to understand radiation/radioactivity, the units used to measure them, and natural sources of radiation in the environment. A brief explanation is provided to differentiate between radiation from nuclear power production and other sources, be they man-made or natural. The doses produced from the other sources of radiation can be compared to the data presented in this report.

C. Radiation and Radioactivity All matter is made of atoms. An atom is the smallest part into which matter can be broken down and still maintain all its chemical properties. Nuclear radiation is energy, in the form of waves or particles that is given off by unstable, radioactive atoms. Radioactive material exists naturally and has always been a part of our environment. The earth's crust, for example, contains radioactive uranium, radium, thorium and potassium. Some radioactivity is a result of nuclear weapons testing. Examples of radioactive fallout that is normally present in environmental samples are Cesium-137 (Cs-137) and Strontium-90 (Sr-90).

Some examples of radioactive materials released from a nuclear power plant are Cs-137, I-131, Sr-90 and Cobalt-60 (Co-60).

Radiation is measured in units of millirem (mrem); much like temperature is measured in degrees. A millirem is a measure of the biological effect of the energy deposited in tissue. The natural and man-made radiation dose received in one year by the average American is 300 to 400 mrem (References 5, 6, 7 in Table 1 below). Radioactivity is measured in curies. A curie is that amount of radioactive material needed to produce 3.70E+10 nuclear disintegrations per second. This is an extremely large amount of radioactivity in comparison to environmental radioactivity. That is why radioactivity in the environment is measured in picocuries. One picocurie is equal to 1.00E-12 (one trillionth) of a curie.

D. Sources of Radiation As mentioned previously, naturally occurring radioactivity has always been a part of our environment. Table I shows the typical doses received from natural and man-made sources.

Table 1 Radiation Sources and Corresponding Doses (4)

NATURAL MAN-MADE Radiation Dose Radiation Dose Source Source (mrem/yr) (mrem/yr)

Internal, inhalation (5) 228 Medical (6) 300 External, space 33 Consumer (7) 13 Internal, ingestion 29 Industrial(8) 0.3 External, terrestrial 21 Occupational 0.5 Weapons Fallout <1 Nuclear Power Plants <1 Approximate Total 311 Approximate Total 314 Cosmic radiation from the sun and outer space penetrates the earth's atmosphere and continuously bombards us with rays and charged particles.

Some of this cosmic radiation interacts with gases and particles in the atmosphere, making them radioactive in turn. These radioactive byproducts from cosmic ray bombardment are referred to as cosmogenic radionuclides.

Isotopes such as beryllium-7 (Be-7) and carbon-14 (C-14) are formed in this way. Exposure to cosmic and cosmogenic sources of radioactivity results in a dose of 33 mrem/yr.

Additionally, natural radioactivity is in our body, in the food we eat (about 29 mrem/yr), in the ground we walk on (about 21 mrem/yr), and in the air we breathe (about 228 mrem/yr). One percent of all potassium in nature is the radioactive potassium-40 (K-40). The majority of a person's annual dose results from exposure to radon and thoron in the air we breathe. These gases and their radioactive decay products arise from the decay of naturally occurring uranium, thorium and radium in soil and in building products such as brick, stone and concrete. Radon and thoron levels vary greatly with location, primarily due to changes in the concentration of uranium and thorium in the soil. Residents at some locations in Colorado, New York, Pennsylvania, and New Jersey have a higher annual dose as a result of higher levels of radon/thoron gases in these areas. In total, these various sources of naturally occurring radiation and radioactivity contribute to a total dose of about 311 mrem per year (mrem/yr).

In addition to natural radiation, we are normally exposed to radiation from a number of man-made sources. The single largest dose from man-made sources result from therapeutic and diagnostic applications of x-rays and radiopharmaceuticals. The annual dose to an individual in the U.S. from medical and dental exposure is about 300 mrem. Consumer products, such as televisions and smoke detectors, contribute about 13 mrem/yr. Much smaller doses result from weapons fallout and nuclear power plants (less than 1 mrem/yr). Typically, the average person in the United States receives about 314 mrem/yr from man-made sources.

Some of the natural radioactive nuclides discussed above were identified in PBAPS REMP samples. The typical power production radionuclides, described in the next sections, were not identified and thus it can be concluded that PBAPS did not impact man and the environs during the 2020 operating period.

III. Program Description A. Sample Collection Exelon Industrial Services (EIS) collected samples for the REMP for PBAPS Exelon Nuclear. This section describes the collection methods used by EIS to obtain environmental samples for the PBAPS REMP in 2020. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-3, Appendix B. The collection procedures used by EIS are listed in Table B-2, Appendix B.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, fish and sediment. Surface water is sampled from two locations as prescribed by the ODCM: one upstream (1LL) and one downstream (1MM) of the plant discharge canal. Drinking water is sampled from a control location (6I) and up to 3 locations nearest to public drinking water supplies. Two locations are identified in the ODCM as the closest drinking water supplies, the Conowingo Dam (4L) and Chester Water Authority (13B). All samples were collected weekly by automatic sampling equipment or as grab samples. Weekly samples from each location were composited into two one-gallon monthly samples for analysis. A separate quarterly composite of the monthly samples was also collected.

Fish sample collection locations required by the ODCM are in an area close to the discharge of PBAPS (4) and a control location, unaffected by plant discharge (6).

These samples were comprised of the flesh of commercially and recreationally important species specific to the environs around PBAPS. Fish samples were collected semiannually from two groups: Bottom Feeder (channel catfish, flathead catfish, carp and redhorse sucker) and Predator (smallmouth and largemouth bass), as these are the types of fish commonly collected by the public from the river around PBAPS. The total weight of fish flesh was approximately 1000 grams.

The samples were preserved on ice for shipping to the laboratory.

The ODCM requires one sediment sample to be collected downstream of the plant in an area with existing or potential recreational value. The REMP collects samples from three locations (4J, 4T and 6F; 6F is the control). Sediment samples, composed of recently deposited substrate, were collected semiannually.

Multiple grab samples of the sediment were collected to obtain an approximately homogenous, representative sample totaling 1000 grams.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on milk and food product samples. The ODCM requires milk samples at three locations with the highest dose potential, within three miles of PBAPS and one sample at a control location. The REMP meets these requirements and samples extra locations. Milk samples were collected biweekly at five locations (J, R, S, U, X and V; V is the control) from April through November, when the cows were on pasture, and monthly from December through March, when the cows were primarily on feed. Six additional locations (C, D, E, P, W and Y; C and E are the controls) were sampled quarterly. Two-gallon samples were collected directly from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.

The ODCM requires food products to be collected from the area of highest dose impact and a control location if milk sampling is unavailable in those locations.

Milk sampling occurs in most every sector, except for SSE, S and WSW, where gardens are established for sampling. Food product samples, comprised of annual broad green leaf vegetation, were collected monthly at four locations (1C, 2Q, 3Q and 55; 55 is the control) from June through September. Typically, the planting season starts late April/early May, with the plants gaining sufficient mass for collection in late June or July. Approximately 1000 g of unwashed samples were collected in plastic bags and shipped promptly to the laboratory, but sample size varied on garden production.

Airborne Environment The airborne atmospheric environment was evaluated by performing radiological analyses on air particulate and radioiodine samples. The ODCM requires sampling from five locations, including three site boundary locations with greatest dose impact, one location within a local community with the highest dose impact, and one control location. Air particulate and radioiodine samples were collected and analyzed weekly from five locations (1B, 1C, 1Z/1A, 3A and 5H2; 5H2 is the control, 1A is the duplicate QA location). Airborne iodine and particulate samples were obtained at each location using a vacuum pump to pull air through a glass fiber filter and charcoal cartridge. The pumps were run continuously and sampled air at the rate of approximately 1 cubic foot per minute to obtain a minimum total volume of 280 cubic meters. The weekly filters were composited for a quarterly sample.

Ambient Gamma Radiation The ambient gamma radiation in the areas surrounding PBAPS is measured using dosimeters, which are exposed to ambient radiation in the field and exchanged quarterly. The ODCM requires at least 40 routine monitoring stations with two or more dosimeters at each location for continuous monitoring.

The REMP contains 48 dosimeter monitoring locations.

Optically-Stimulated Luminescent Dosimeters (OSLD) replaced the Thermo-Luminescent Dosimeter (TLD) starting in 2012. However, PBAPS continued using TLD in addition to OSLD to compare the two technologies, although only the OSLD data is reported. TLD field deployment will be discontinued starting in 2020.

The OSLD locations were placed on and around the PBAPS site as follows:

Site boundary monitoring consists of 19 locations (1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 1M, 1NN, 1P, 1Q, 1R, 2, and 40), near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses).

Intermediate distance monitoring consists of 23 locations (14, 15, 17, 22, 23, 26, 27, 31A, 32, 3A, 42, 43, 44, 45, 46, 47, 48, 49, 4K, 5, 50, 51 and 6B), extending to approximately 5 miles from the site and designed to measure possible exposures to close-in population.

Six locations (16, 18, 19, 24, 2B and 1T) represent control and special interests areas such as population centers, schools, and nearest residents.

The specific dosimeter locations were determined by the following criteria:

1. The presence of relatively dense population, nearby residences, schools, and control locations;
2. Site meteorological data taking into account distance and elevation for each of the sixteen 22.5 degree sectors around the site, where estimated annual dose from PBAPS, if any, would be more significant;
3. And on hills free from local obstructions and within sight of the vents (where practical).

Each dosimetry location in the environment has 2 OSLD and 2 TLD dosimeters which were enclosed in plastic as a moisture barrier. Dosimeter housing are mesh plastic tubes, aligned horizontally and oriented such that dosimeter windows face the plant. Dosimeters themselves were placed vertically in the tubes so that no dosimeter was covered by another dosimeter and all dosimeters properly faced the plant.

B. Sample Analysis This section describes the analytical methods used by TBE, EIS and GEL Labs to analyze the environmental samples for radioactivity. The analytical procedures used by the laboratories are listed in Table B-2, Appendix B.

The required OCDM analyses include:

1. Concentrations of beta emitters in drinking water and air particulates;
2. Concentrations of gamma-emitting nuclides in surface and drinking water, air particulates, milk, fish, sediment and food products;
3. Concentrations of tritium in surface and drinking water;
4. Concentrations of I-131 in air, milk, and food products. Although not required by the ODCM, I-131 is also analyzed in drinking and surface water;
5. Ambient gamma radiation levels at various site environs.

C. Data Interpretation The radiological environmental and direct radiation data collected prior to PBAPS becoming operational was used as a baseline with which the 2020 operational data were compared. In addition, data were compared to previous years operational data for consistency and trending. Several factors are important in the interpretation of the data.

1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD is intended as a before-the-fact (a priori) estimate of a system (including instrumentation, procedure and sample type) and not as an after-the-fact (a posteriori) measurement. All analyses are designed to achieve the required detection limits for environmental samples, as described in the PBAPS ODCM.

The minimum detectable concentration or activity (MDC or MDA) is defined as the after-the-fact (a posteriori) estimate determined during the analysis of the sample.

2. Net Activity Calculation and Reporting of Results Net activity for a sample is calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations can result in sample activity being lower than the background activity causing a negative number.

MDC is reported in all cases where positive activity was not detected. In previous years, when net activity was reported, a lower baseline is seen in trending when compared to 2020 results.

Gamma spectroscopy results for each type of sample were grouped as follows:

  • For surface and drinking water, twelve nuclides, manganese-54 (Mn-54), cobalt-58 (Co-58), iron-59 (Fe-59), cobalt-60 (Co-60),

zinc-65 (Zn-65), zirconium-95 (Zr-95), niobium-95 (Nb-95), I-131, cesium-134 (Cs-134), Cs-137, barium-140 (Ba-140), and lanthanum-140 (La-140) were reported.

  • For fish, eight nuclides, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Cs-134 and Cs-137 were reported.
  • For air particulates, six nuclides, Be-7, Mn-54, Co-58, Co-60, Cs-134 and Cs-137 were reported.
  • For milk, six nuclides, K-40, I-131, Cs-134, Cs-137, Ba-140 and La-140 were reported.
  • For food products, eight nuclides, Be-7, K-40, Mn-54, Co-58, Co-60, I-131, Cs-134 and Cs-137 were reported.

Positive activity values (greater than MDC) were recorded and the mean and two standard deviation of the results were calculated. The standard deviation represents the variability of measured results for different samples of the same media rather than a single analysis uncertainty.

D. Program Exceptions For 2020, the PBAPS REMP had a sample collection recovery rate of > 99%.

The exceptions to this program are listed below:

Table 2 LIST OF SAMPLE ANOMALIES Location Sample Type Collection Date Reason Code For gardens planted in May, there All Food Products May, 2020 was insufficient volume for May Locations collection Only 2 of 3 samples could be September, Food Products 1C collected due to end of season -

2020 normal occurrence. (IR 04371560)

Composite sampler timer out of Water 6I 10/10-11/04 service- grab sample obtained.

Table 3 LIST OF MISSING SAMPLES AND EQUIPMENT ISSUES Location Sample Type Collection Date Reason Code Air sampler GFCI tripped, which led to AP/AI* 1B 05/20-06/06 a missed sample. (IR02701975 05)

  • AP/AI = Air Particulates/Air Iodine Each program exception was reviewed to understand the causes of the program exception, and to implement corrective actions as necessary. Sampling and maintenance errors were reviewed with the personnel involved to prevent a recurrence. Occasional equipment breakdowns and power outages were unavoidable.

IV. Program Changes There were no program changes in 2020.

V. Results and Discussion Appendix A contains a summary of all 2020 PBAPS REMP results which meets the requirement of Table 3 of NUREG 1302 'Branch Technical Position Paper'9. Table A-1 lists results by each sample media and analyses performed. The total number of analyses performed, required LLD, the number of positive results for each indicator and control location are also listed. From the positive results identified (greater than the MDA) the mean value, range and station locations with highest annual mean are listed.

Commonly-identified nuclides are gross beta, K-40, and Be-7.

A. Aquatic Environment

1. Surface Water A summary of the 2020 analysis results for surface water samples from stations 1LL and 1MM are listed below:

Tritium Quarterly samples were analyzed for tritium activity. No tritium activity was detected and the required LLD was met. (Table C-I.1, Appendix C)

Iodine Monthly samples were analyzed for low level I-131. All results were less than the MDC and the required LLD was met. (Table C-I.2, Appendix C)

Gamma Spectrometry Monthly samples were analyzed for gamma-emitting nuclides. All nuclides were less than the MDC and all required LLDs were met.

(Table C-I.3, Appendix C)

2. Drinking Water The results from the drinking water samples collected in 2020 from stations 13B, 4L and 6I are described below:

Gross Beta Samples from all locations were analyzed monthly for concentrations of gross beta activity (Table C-II.1 and Figure C-1 Appendix C). Gross beta activity was detected in 18 of 36 samples. The values ranged from 1.7 to 4.5 pCi/L with a mean value of 3.1 +/- 1.9 pCi/L. The mean detected gross beta activity was less than the required LLD (4 pCi/L) which indicates that the measurement technique was even more sensitive than required. The detectable gross beta activity was well below the procedural investigation level (15 pCi/L).

Concentrations detected were generally below those detected in previous years.

Tritium Monthly samples were composited quarterly and analyzed for tritium activity.

Tritium activity was not detected in any samples and the required LLD was met.

(Table C-II.2, Appendix C)

Iodine Monthly samples were analyzed for low level I-131. All results were less than the MDC and the required LLD was met. (Table C-II.3, Appendix C)

Gamma Spectrometry Samples from the three locations were analyzed monthly for gamma-emitting nuclides. All nuclides were less than the MDC and all required LLDs were met.

(Table C-II.4, Appendix C)

3. Fish Results from fish samples collected at locations 4 and 6 in 2020 are described below:

Gamma Spectrometry The edible portions of the collected fish samples were analyzed semiannually for gamma-emitting nuclides (Table C-III.1, Appendix C). Naturally-occurring K-40 was found at all stations and ranged from 3,101 to 3,631 pCi/kg (wet),

with a mean value of 3,271 +/- 382 pCi/kg (wet), consistent with levels detected in previous years. No fission or activation products, due to plant operations were found in 2020 and all required LLDs were met. Figure C-2, Appendix C, displays the various gamma radionuclide MDC results for locations 4 and 6, based on the type of fish collected. All MDC results are less than the nuclide-specific LLDs. The last 15-year average Cs-137 MDC is also shown to trend 2020 results with historical results. There have been no detectable levels of Cs-137 in fish since 1983.

4. Sediment Sediment samples were collected at locations 6F, 4J, and 4T and the results are described below:

Gamma Spectrometry Sediment samples were analyzed for gamma-emitting nuclides (Table C-IV.1, Appendix C). K-40 was found in all locations and ranged from 11,300 to 19,980 pCi/kg (dry) with a mean value of 15,647 +/- 6,744 pCi/kg (dry). No fission or activation products were found and all LLDs were met. The Cs-137 MDC results are displayed in Figure C-3, Appendix C, along with the 20-year average results.

B. Atmospheric Environment

1. Airborne Particulates Continuous air particulate samples were collected from five locations. The five locations were separated into three groups: Group I represents locations within the PBAPS site boundary (1B, 1C and 1Z/1A), Group II represents the location of the closest local community (3A) and Group III represents the control location at a remote distance from PBAPS (5H2). 1A results are discussed in Section H, Secondary Laboratory Analysis. The results from samples collected in 2020 are described below:

Gross Beta Weekly samples were analyzed for concentrations of beta- emitters (Tables C-V.1, Appendix C). Detectable gross beta activity was observed at all locations. Onsite results ranged from 6E-3 to 31E-3 pCi/m3, with a mean of 15E-3 +/- 11E-3 pCi/m3. The results from local communities ranged from 8E-3 to 30E-3 pCi/m3 with a mean of 16E-3 +/- 12E-3 pCi/m3. The control results ranged from 7E-3 to 33E-3 pCi/m3 with a mean of 16E-3 +/- 12E-3 pCi/m3.

The range of detectable results and mean value from all locations are the same within error, indicating the gross beta activity is not a result of the operation of PBAPS, as shown in Figure C-4, Appendix C. In addition, a comparison of the 2020 air particulate data with historical data indicates a decreasing trend in gross beta activity since initial operation of the plant (Figure C-4, Appendix C).

Gamma Spectrometry Quarterly samples were analyzed for gamma-emitting nuclides (Table C-V.2, Appendix C). Naturally-occurring Be-7 activity, from cosmic rays, was detected in all 20 samples. The values ranged from 54E-3 to 116E-3 pCi/m3, with a mean value of 81E-3 +/- 23E-3pCi/m3. All power production nuclides were less than the MDC and all required LLDs were met.

2. Airborne Iodine Weekly samples were also analyzed for low-level I-131. All results were less than the MDC for I-131 and the required LLD was met.

(Table C-VI.1, Appendix C)

C. Terrestrial

1. Milk During 2020, 150 milk samples were collected and analyzed from the following locations: D, J, R, P, S, U, W, X, Y (indicators) and C, E, V (controls). The results are described below:

Iodine-131 Milk samples from all locations were analyzed for concentrations of I-131 (Tables C-VII.1, Appendix C). All results were less than the MDC for I-131 and all required LLDs were met. Figure C-5 displays the 2020 milk I-131 results for both indicator and control locations. All results are less than the LLD (1 pCi/L) and much less than the reporting level (3 pCi/L).

Gamma Spectrometry Milk samples from all locations were analyzed for concentrations of gamma-emitting nuclides (Table C-VII.2, Appendix C). Naturally- occurring K-40 was found in all samples and ranged from 643 to 1,583 pCi/l, with a mean value of 1249 +/- 270 pCi/L. All other nuclides were less than the MDC and all required LLDs were met.

2020 Cs-134 and Cs-137 MDC results are plotted in Figure C-5 with the required LLDs and Reporting Levels. All results are much less than the LLDs and reporting levels. The last 15-year average MDC of Cs-137 in milk is also plotted in Figure C-5, Appendix C. There is no statistical difference between the 2020 MDC Cs-137 results and the 15-year historical MDC.

2. Food Products Throughout 2020, 47 samples of various green leafy vegetation (swiss chard, cabbage, collards, kale, broccoli, etc.) were collected and analyzed for concentrations of gamma-emitting nuclides (Table C-VIII.1, Appendix C). The results are discussed below:

Gamma Spectrometry Naturally-occurring Be-7 activity was found in 18 of 47 samples and ranged from 370 to 3,534 pCi/kg (wet), with a mean of 1,219 +/- 1,784 pCi/kg (wet).

Also, naturally-occurring K-40 activity was found in all samples and ranged from 1,380 to 7,608 pCi/kg (wet), with a mean of 4,242 +/- 2,705 pCi/kg (wet).

All power production nuclides were less than the MDC and all required LLDs were met.

D. Ambient Gamma Radiation Results of OSLD measurements are listed in Tables C-IX.1 and C-IX.2 and Figure C-6, Appendix C.

In 2019, six years of OSLD data (2012-2018) were re-evaluated with the new methodology presented in Exelon corporate procedure CY-AA-170-1001, in order to determine a background dose and baseline for each location in the REMP.

Detectable Facility Dose is any normalized net dose above the sum of the normalized mean background dose and minimum differential dose (BQ/A + MDDQ/A) and is reported both quarterly and annually for each location. Therefore, mean gross dose of 'indicator' and 'control' locations will no longer be reported. Only Quarterly and Annual Normalized Net Dose for each location is reported in Table C-IX.1 and C-IX.2.

The net dose is calculated by subtracting a control transit dosimeter and extraneous dose rather than a control or background location dose. The net dose is normalized to a standard 91-day quarter rather than previously reported monthly doses. Figure C-6 displays the BA + MDDA for each location as a dash mark, and the annual normalized net dose is shown as a column graph. Any column above the dash mark, would indicate positive facility related dose.

All locations showed no normalized net quarterly dose above the BA + MDDA, therefore, there is no detectable ambient gamma radiation to the members of the public due to PBAPS operations E. Independent Spent Fuel Storage Installation (ISFSI)

ISFSI was initiated in June 2000. Three new casks were added to the ISFSI pad in 2020, filling the original ISFSI pad design requiring construction of a second pad, which completed in 2019. Site boundary OSLDs which measure the ambient gamma radiation closest to ISFSI are locations 1A, 1D, 1M, 1P, 1Q, 1R, with 1R being the closest. Location 2B is the nearest real resident which could be impacted by ISFSI. Location 1R showed positive facility-related dose (<25 mrem/yr) yet did not impact the nearest resident location (2B) as that location had no detectable facility-related dose. Location 2B, follows closely with values from locations 1A, 1D, and controls, indicating no impact from ISFSI on nearest real resident. Data from location 2B is used to demonstrate compliance to both 40CFR190 and 10CFR72.104 limits. All radiation levels are well below regulatory limits.

In 2019, a six year data set (2012-2018) was used to determine the background dose at each location. In 2020, there was no detectable facility-related dose at any location. Detectable facility-related dose at 1R in the 3Q of 2019 (6.4 mrem/std. qtr), leading to detectable annual facility-related dose (15.5 mrem/yr).

This was the first time PB reported facility-related dose due to ISFSI, which was expected due to the increasing trends seen at 1R over the years.

Also in 2019, the ISFSI pad was filled with its last TN-68 cask. Construction began last year on a second ISFSI pad which was loaded with Holtec casks.

Facility-related dose is expected to increase due to the second ISFSI pad, but still remain below the 40CFR190 and 10CFR72.104 limits.

F. Land Use Census A Land Use Survey, conducted during the fall of 2020, was performed by Exelon Industrial Services (EIS), to comply with Section 3.8.E.2 of PBAPS's ODCM Specifications. The survey documented the nearest milk-producing and meat animal, nearest residence, and garden larger than 500 square feet in each of the sixteen meteorological sectors out to five miles.

Also, because PBAPS is an elevated release facility, an additional requirement of identifying all gardens larger than 500 square feet and every dairy operation within three (3) miles was included in the survey. The distance and direction of all locations were positioned using Global Positioning System (GPS) technology. The results of this survey are summarized below.

There was no change in nearest residents compared to the 2019 report. There were gardens identified in all sectors except the NNW sector. Eight (8) new gardens were located this year in NNE, NE, ENE, ESE, SW, WSW, WNW and NW sectors. The new gardens in the ESE and NW sectors were identified as the closest gardens for that sector. The nearest gardens in all other sectors are the same as in the 2019 report.

Animals used for meat consumption were identified in 15 of the 16 sectors (NNW sector had no animals identified this year). Seven (7) new sites were identified this year in NE, ESE, SSW, WSW, NW and NNW sectors, with the nearest meat animal in the WSW and NNW sectors. The nearest animal in all other sectors remains the same as in last years report. Dairy sites were identified in 12 of 16 sectors. There were no new dairy sites there were no changes in nearest milk-producing animal in any sector.

Location of the Nearest Residence, Garden, Milk, Meat, Animal within a Five-Mile Radius of PBASP Reactor Building Exhaust Vents Sector Residence Feet Garden Feet Milk Farm Feet Meat Animal Feet 1 N 12,362 14,003 14,183 14,183 2 NNE 11,112 11,041 10,843 10,843 3 NE 10,080 10,004 10,492 10,080 4 ENE 10,495 11,554 10,925* 10,925 5 E 10,066 14,540 14,471 13,712 6 ESE 16,085 19,109 20,154 16,085 7 SE 10,772 10,772 19,134* 19,134 8 SSE 3,912 3,912 - -

9 S 5,545 5,545 - 9,247 10 SSW 6,072 6,418 11,602 7,187 11 SW 4,755 4,865 4,860* 4,860 12 WSW 4,036 7,487 - 4,204 13 W 5,327 5,327 5,136* 5,136 14 WNW 2,928 4,192 22,124 3,926 15 NW 2,948 9,545 9,545 7,582 16 NNW 5,124 - - 5,124

  • Farm included in the REMP G. Errata Data There was no errata data for 2020.

H. Secondary Laboratory Analysis Appendix D of this report presents the results of data analyses performed by the QC laboratory, EIS and GEL. Duplicate samples were obtained from several locations and analyzed by both the primary and QC laboratories.

GEL was only used for H-3 analyses of water samples because EIS could not perform those analyses. Comparisons of the results for all media were within expected ranges. (Figures D-1 and D-2)

I. Summary of Results - Quality Control (QC) Laboratory Analysis The primary and secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, food products and water matrices (Appendix E). The PE samples, supplied by Eckert & Ziegler Analytics, Inc., Environmental Resource Associates (ERA) and DOEs Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against a pre-set acceptance criteria described in Appendix F.

For the Teledyne Brown Engineering (TBE) laboratory, 126 out of 133 analyses performed met the specified acceptance criteria. Seven analyses (AP - U-233/234, U-238; milk Sr-89; water I-131, Gross Alpha, Gross Beta; soil - Ni-63) did not meet the specified acceptance criteria and are documented in Appendix F. TBE has addressed each issue through the TBE Corrective Action Program.

The EIS laboratory analyzed the following nuclides for PBAPS: gross beta, gamma and low-level iodine For the EIS laboratory, 158 of 162 analyses met the specified acceptance criteria in 2020. Four (4) analyses did not meet the specified acceptance criteria: water matrix - gross beta; AP - Zn-65 (2 detectors); Milk - Zn-65. Failures were entered into the Corrective Action Program for tracking and to prevent future occurrence.

For the GEL laboratory, 76 of 79 analyses met the specified acceptance criteria. Tritium (water matrix) was the only nuclide analyzed for Peach Bottom REMP and all analyses met the specified acceptance criteria.

Nuclides analyzed for Peach Bottom RGPP included H-3 and Gamma (water matrix). Three water nuclides (H-3, I-131 and Co-60) did not meet the specified acceptance criteria and is documented in Appendix F. All failures were addressed through GELs Corrective Action Program.

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

VI. References

1. Preoperational Environs Radioactivity Survey Summary Report, March 1960 through January 1966. (September 1967)
2. Interex Corporation, Peach Bottom Atomic Power Station Regional Environs Radiation Monitoring Program Preoperational Summary Report, Units 2 and 3, 5 February 1966 through 8 August 1973, June 1977, Natick, Massachusetts
3. Radiation Management Corporation Publication, Peach Bottom Atomic Power Station Preoperational Radiological Monitoring Report for Unit 2 and 3, January 1974, Philadelphia, Pennsylvania
4. Information from NCRP Reports 160 and 94
5. Primarily from airborne radon and its radioactive progeny
6. Includes CT (147 mrem), nuclear medicine (77 mrem), interventional fluoroscopy (43 mrem) and conventional radiography and fluoroscopy (33 mrem)
7. Primarily from cigarette smoking (4.6 mrem), commercial air travel (3.4 mrem),

building materials (3.5 mrem), and mining and agriculture (0.8 mrem)

8. Industrial, security, medical, educational, and research
9. Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, Generic Letter 89-01, Supplement No. 1 (NUREG-1302), April 1991
10. American National Standards Institute/Health Physics Society, (ANSI/HPS)

N13.37-2014, Environmental Dosimetry - Criteria for System Design and Implementation

11. U.S. Nuclear Regulatory Commission, Regulatory Guide 4.13, Revision 2, Environmental Dosimetry - Performance, Specifications, Testing, and Data Analysis, June, 2020
12. Code of Federal Regulations 40 CFR 190, Environmental Radiation Protection Standards for Nuclear Power Operations, 1977 APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 NAME OF FACILITY: PEACH BOTTOM ATOMIC POWER STATION DOCKET NUMBER: 50-277 & 50-278 LOCATION OF FACILITY: YORK COUNTY , PA REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER H-3 8 200 <LLD <LLD - 0 (PCI/LITER)

I-131 24 1 <LLD <LLD - 0 GAMMA 24 Mn-54 15 <LLD <LLD - 0 Co-58 15 <LLD <LLD - 0 Fe-59 30 <LLD <LLD - 0 Co-60 15 <LLD <LLD - 0 Zn-65 30 <LLD <LLD - 0 Nb-95 15 <LLD <LLD - 0 Zr-95 30 <LLD <LLD - 0 Cs-134 15 <LLD <LLD - 0 Cs-137 18 <LLD <LLD - 0 Ba-140 60 <LLD <LLD - 0 La-140 15 <LLD <LLD - 0 DRINKING WATER GR-B 36 4 3.2 2.8 3.5 4L INDICATOR 0 (PCI/LITER) (13/24) (5/12) (6/12) CONOWINGO DAM EL 33' MSL 1.7 - 4.5 1.9 - 3.6 1.7 - 4.5 45900 FEET SE H-3 12 200 <LLD <LLD - 0 I-131 (LOW LVL) 36 1 <LLD <LLD - 0 GAMMA 36 MN-54 15 <LLD <LLD - 0 CO-58 15 <LLD <LLD - 0 FE-59 30 <LLD <LLD - 0 CO-60 15 <LLD <LLD - 0 ZN-65 30 <LLD <LLD - 0 NB-95 15 <LLD <LLD - 0 ZR-95 30 <LLD <LLD - 0 CS-134 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 BA-140 60 <LLD <LLD - 0 LA-140 15 <LLD <LLD - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 NAME OF FACILITY: PEACH BOTTOM ATOMIC POWER STATION DOCKET NUMBER: 50-277 & 50-278 LOCATION OF FACILITY: YORK COUNTY , PA REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS BOTTOM FEEDER GAMMA 4 (PCI/KG WET) K-40 NA 3283 3106.5 3283 4 INDICATOR 0 (2/2) (2/2) (2/2) CONOWINGO POND 3210 - 3356 3101 - 3112 3210 - 3356 600-10000 FEET SE MN-54 130 <LLD <LLD - 0 CO-58 130 <LLD <LLD - 0 FE-59 260 <LLD <LLD - 0 CO-60 130 <LLD <LLD - 0 ZN-65 260 <LLD <LLD - 0 CS-134 130 <LLD <LLD - 0 CS-137 150 <LLD <LLD - 0 PREDATOR GAMMA 4 (PCI/KG WET) K-40 NA 3537 3157.5 3537 4 INDICATOR 0 (2/2) (2/2) (2/2) CONOWINGO POND 3443 - 3631 3104 - 3211 3443 - 3631 600-10000 FEET SE MN-54 130 <LLD <LLD - 0 CO-58 130 <LLD <LLD - 0 FE-59 260 <LLD <LLD - 0 CO-60 130 <LLD <LLD - 0 ZN-65 260 <LLD <LLD - 0 CS-134 130 <LLD <LLD - 0 CS-137 150 <LLD <LLD - 0 SEDIMENT GAMMA 6 (PCI/KG DRY) K-40 NA 15623 15695 19085 4T INDICATOR 0 (4/4) (2/2) (2/2) CONOWINGO POND NEAR CONOWINGO DAM 11300 - 19980 13990 - 17400 18190 - 19980 41800 FEET SE MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 CS-134 150 <LLD <LLD - 0 CS-137 180 <LLD <LLD - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 NAME OF FACILITY: PEACH BOTTOM ATOMIC POWER STATION DOCKET NUMBER: 50-277 & 50-278 LOCATION OF FACILITY: YORK COUNTY , PA REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GR-B 259 10 15 16 17 1B INDICATOR 0 (E-3 PCI/CU.METER) (207/207) (52/52) (51/51) WEATHER STATION #2 6 - 31 7 - 33 9 - 31 2500 FEET NW GAMMA 20 BE-7 NA 77.8 91.7 91.7 5H2 CONTROL 0 (16/16) (4/4) (4/4) MANOR SUBSTATION 54 - 98 69 - 116 69 - 116 162400 FEET NE MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 CS-134 50 <LLD <LLD - 0 CS-137 60 <LLD <LLD - 0 AIR IODINE GAMMA 259 (E-3 PCI/CU.METER) I-131 70 <LLD <LLD - 0 MILK I-131 (LOW LVL) 150 1 <LLD <LLD - 0 (PCI/LITER)

GAMMA 150 K-40 NA 1214 1238 1381 D INDICATOR 0 (121/121) (29/29) (4/4) 643 - 1583 1043 - 1404 1261 - 1583 18500 FEET NE CS-134 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 BA-140 60 <LLD <LLD - 0 LA-140 15 <LLD <LLD - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 NAME OF FACILITY: PEACH BOTTOM ATOMIC POWER STATION DOCKET NUMBER: 50-277 & 50-278 LOCATION OF FACILITY: YORK COUNTY , PA REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS VEGETATION GAMMA 47 (PCI/KG WET) BE-7 NA 1320 959 1849 1C INDICATOR 0 (13/35) (5/12) (5/11) PEACH BOTTOM SOUTH SUB STATION 477 - 3534 370 - 1901 629 - 3534 4700 FEET SSE K-40 NA 4056.2 4782.4 4888 3Q INDICATOR 0 (35/35) (12/12) (12/12) 103 FLINTVILLE RD.

1380 - 6678 2728 - 7608 3478 - 6678 9500 FEET W MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 I-131 60 <LLD <LLD - 0 CS-134 60 <LLD <LLD - 0 CS-137 80 <LLD <LLD - 0 DIRECT RADIATION OSLD-QUARTERLY 192 NA ND* ND* N/A* 0 (MILLI-ROENTGEN/STD.MO.) ND* ND*

  • ND = Nondetectable; N/A = Mean no longer reported for direct radiation (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

APPENDIX B SAMPLE DESIGNATION AND LOCATIONS

Intentionally left blank TABLE B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2020 Distance & Direction Location Location Description From Site A. Surface Water 1LL Peach Bottom Units 2 and 3 Intake - Composite (Control) 1,200 feet ENE 1MM Peach Bottom Canal Discharge -Composite 5,500 feet SE B. Drinking (Potable) Water 4L Conowingo Dam EL 33' MSL - Composite 45,900 feet SE 6I Holtwood Dam Hydroelectric Station - Composite 30,500 feet NW (Control) 13B Chester Water Authority (CWA) Susquehanna Pumping 13,300 feet ESE Station- Composite C. Fish 4 Conowingo Pond 6,000 - 10,000 feet SE 6 Holtwood Pond (Control) 50,000 - 70,000 feet NNW D. Sediment 4J Conowingo Pond near Berkins Run 7,400 feet SE 4T Conowingo Pond near Conowingo Dam 41,800 feet SE 6F Holtwood Dam (Control) 31,500 feet NW E. Air Particulate - Air Iodine 1B Weather Station #2 2,500 feet NW 1Z Weather Station #1 1,500 feet SE 1A Weather Station #1 1,500 feet SE 1C Peach Bottom South Sub Station 4,700 feet SSE 3A Delta, PA - Substation 19,300 feet SW 5H2 Manor Substation (Control) 162,400 feet NE F. Milk - bi-weekly / monthly J 5,100 feet W R 4,900 feet SW S 19,100 feet SE U 11,200 feet SSW V (Control) 32,600 feet W X 9,500 feet NW G. Milk - quarterly C (Control) 50,400 feet NW D 18,500 feet NE E (Control) 46,100 feet N P 11,000 feet ENE W 89,200 feet S Y 10,500 feet NE H. Food Products 1C 4,700 feet SSE 2Q 9,200 feet SW 3Q 9,500 feet W 55 (Control) 51,900 feet NE B-1

TABLE B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2020 Distance & Direction Location Location Description From Site J. Environmental Dosimetry - OSLD Site Boundary 1A Weather Station #1 1,500 feet SE 1B Weather Station #2 2,500 feet NW 1C Peach Bottom South Substation 4,700 feet SSE 1D 140 o Sector 3,500 feet SSE 1E Peach Bottom 350o Sector Hill 3,000 feet NNW 1F Peach Bottom 200o Sector Hill 2,900 feet SSW 1G Peach Bottom North Substation 3,100 feet WNW 1H Peach Bottom 270o Sector Hill 3,200 feet W 1I Peach Bottom South Substation 2,900 feet S 1J Peach Bottom 180o Sector Hill 4,000 feet S 1K Peach Bottom Site Area 4,700 feet SW 1L Peach Bottom Unit 3 Intake 1,100 feet NE 1M Discharge 5,400 feet SE 1NN Peach Bottom Site 2,700 feet WSW 1P Tower B & C Fence 2,200 feet ESE 1Q Tower D & E Fence 3,300 feet SE 1R Transmission Line Hill/ISFSI Pad 2,800 feet SSE 2 Peach Bottom 130o Sector Hill 4,700 feet SE 2B* Burk Property 3,900 feet SSE 40 Peach Bottom Site Area 8,000 feet SW Intermediate Distance 1T* Lay Road/LLRWSF 3,100 feet WNW 3A Delta, PA Substation 19,300 feet SW 4K Conowingo Dam Power House Roof 45,900 feet SE 5 Wakefield, PA 24,400 feet E 6B Holtwood Dam Power House Roof 30,400 feet NW 14 Peters Creek 10,300 feet E 15 Silver Spring Rd 19,300 feet N 17 Riverview Rd 21,500 feet ESE 22 Eagle Road 12,500 feet NNE 23 Peach Bottom 150o Sector Hill 5,500 feet SSE 26 Slab Road 21,800 feet NW 27 N. Cooper Road 14,400 feet S 31A Eckman Rd 24,100 feet SE 32 Slate Hill Rd 14,400 feet ENE 42 Muddy Run Environ. Laboratory 21,600 feet NNW 43 Drumore Township School 26,200 feet NNE 44 Goshen Mill Rd 26,700 feet NE 45 PB-Keeney Line 18,500 feet ENE 46 Broad Creek 23,800 feet SSE 47 Broad Creek Scout Camp 22,700 feet S 48 Macton Substation 26,500 feet SSW 49 PB-Conastone Line 21,500 feet WSW 50 TRANSCO Pumping Station 26,400 feet W 51 Fin Substation 21,000 feet WNW Control 16 Nottingham, PA Substation (Control) 67,100 feet E 18 Fawn Grove, PA (Control) 52,200 feet W 19 Red Lion, PA (Control) 124,000 feet WNW 24 Harrisville, MD Substation (Control) 58,200 feet ESE

  • Nearest Residents B-2

TABLE B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Peach Bottom Atomic Power Station, 2020 Sample Sampling Sample Analysis Collection Procedure Number Analytical Procedure Number Medium Method Size CY-ES-240 Surface, Drinking, and Monthly composite Effluent Water Sample Collection for TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Surface Gamma Radiological Analysis from a continuous 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Water Spectroscopy water compositor ST-C-095-835-2 Circulating Water Intake Detector with the Genie PC Counting System and Discharge Composite Sampling CY-ES-240 Surface, Drinking, and Quarterly TBE, TBE-2011 Tritium Analysis in Drinking Water by Effluent Water Sample Collection for Surface composite from a Liquid Scintillation Tritium Radiological Analysis 500 ml Water continuous water GEL, EPA906.0 Mod, for Tritium analysis by Liquid compositor ST-C-095-835-2 Circulating Water Intake Scintillation and Discharge Composite Sampling CY-ES-240 Surface, Drinking, and Monthly composite Effluent Water Sample Collection for TBE, TBE-2012 Radioiodine in Various Matrices Surface Radiological Analysis I-131 from a continuous 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Water water compositor ST-C-095-835-2 Circulating Water Intake Detector with the Genie PC Counting System B-3 and Discharge Composite Sampling TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in Monthly composite CY-ES-240 Surface, Drinking, and Various Matrices Drinking Gross Beta from a continuous Effluent Water Sample Collection for 2 gallon Water CY-ES-206, Operation of the Tennelec S5E Proportional water compositor Radiological Analysis Counter Monthly composite CY-ES-240 Surface, Drinking, and TBE, TBE-2012 Radioiodine in Various Matrices Drinking I-131 from a continuous Effluent Water Sample Collection for 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Detector Water water compositor Radiological Analysis with the Genie PC Counting System Monthly composite CY-ES-240 Surface, Drinking, and TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Drinking Gamma from a continuous Effluent Water Sample Collection for 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Water Spectroscopy water compositor Radiological Analysis Detector with the Genie PC Counting System Quarterly TBE, TBE-2011 Tritium Analysis in Drinking Water by CY-ES-240 Surface, Drinking, and Liquid Scintillation Drinking composite from a Tritium Effluent Water Sample Collection for 500 ml Water continuous water GEL, EPA906.0 Mod, for Tritium Analysis by Liquid Radiological Analysis compositor Scintillation Semi-annual TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma samples collected NAI-ER3 Collection of fish samples for 1000 grams Fish EIS, CY-ES-205 Gamma Counting Using the HPGe Spectroscopy via electroshocking radiological analysis (PBAPS) (wet) or other techniques Detector with the Genie PC Counting System

TABLE B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Peach Bottom Atomic Power Station, 2020 Sample Sampling Sample Analysis Collection Procedure Number Analytical Procedure Number Medium Method Size TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma Semi-annual grab NAI-ER3 Collection of sediment samples 500 grams Sediment EIS, CY-ES-205, Gamma Counting Using the HPGe Spectroscopy samples for radiological analysis (PBAPS) (dry)

Detector with the Genie PC Counting System One-week composite of 1 filter TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity in CY-ES-237 Air Iodine and Air Particulate Various Matrices Air continuous air (~ 280 Gross Beta Sample Collection for Radiological Particulates sampling through cubic meters EIS, CY-ES-206, Operation of the Tennelec S5E Analysis glass fiber filter weekly) Proportional Counter paper TBE, TBE-2023 Compositing of samples 13 filters TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Quarterly Air Gamma (~ 3600 composite of each CY-ES-204 Sample Preparation for EIS, CY-ES-205 Gamma Counting Using the HPGe Particulates Spectroscopy cubic station Gamma and Beta Counting Detector with the Genie PC Counting System meters)

One-week 1 filter TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis composite of CY-ES-237 Air Iodine and Air Particulate Gamma (~ 280 Air Iodine continuous air Sample Collection for Radiological EIS, CY-ES-205 Gamma Counting Using the HPGe Spectroscopy cubic meters sampling through Analysis Detector with the Genie PC Counting System weekly) charcoal filter B-4 Bi-weekly grab sample when cows TBE, TBE-2012 Radioiodine in Various Matrices CY-ES-238 Milk Sample Collection for Milk I-131 are on pasture. 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Radiological Analysis Monthly all other Detector with the Genie PC Counting System times Bi-weekly grab sample when cows TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Gamma CY-ES-238 Milk Sample Collection for Milk are on pasture; 2 gallon EIS, CY-ES-205 Gamma Counting Using the HPGe Spectroscopy Radiological Analysis Monthly all other Detector with the Genie PC Counting System times TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Food Gamma Monthly when CY-ES-241 Vegetation Sample Collection 1000 grams EIS, CY-ES-205 Gamma Counting Using the HPGe Products Spectroscopy available for Radiological Analysis Detector with the Genie PC Counting System Quarterly OSLDs Optically comprised of two Stimulated CY-ES-239, Collection/Exchange of Field Al2O3:C Landauer 2 dosimeters Landauer Incorporated OSLD Luminescence Dosimeters for Radiological Analysis Incorporated Dosimetry elements.

Figure B-1 Environmental Sampling Locations Within One Mile of Peach Bottom Atomic Power Station, 2020 B-5

Figure B-2 Environmental Sampling Locations Between One and Approximately Five Miles of Peach Bottom Atomic Power Station, 2020 B-6

Figure B-3 Environmental Sampling Locations Greater Than Five Miles from Peach Bottom Atomic Power Station, 2020 B-7

Intentionally left blank APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

Intentionally left blank Table C-I.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION PERIOD 1LL 1MM 01/01/20 - 04/01/20 < 188 < 184 04/01/20 - 07/01/20 < 186 < 186 07/01/20 - 09/30/20 < 173 < 168 09/30/20 - 12/29/20 < 180 < 182 MEAN - -

Table C-I.2 CONCENTRATIONS OF LOW LEVEL I-131 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION PERIOD 1LL 1MM 01/01/20 - 01/29/20 < 0.9 < 0.8 01/29/20 - 02/26/20 < 1.0 < 0.8 02/26/20 - 04/01/20 < 0.6 < 0.6 04/01/20 - 04/29/20 < 0.7 < 0.6 04/29/20 - 05/27/20 < 0.8 < 0.8 05/27/20 - 07/01/20 < 0.7 < 0.8 07/01/20 - 07/29/20 < 0.6 < 0.6 07/29/20 - 09/02/20 < 0.7 < 0.7 09/02/20 - 09/30/20 < 0.7 < 0.8 09/30/20 - 10/28/20 < 0.9 < 0.6 10/28/20 - 12/02/20 < 0.9 < 0.8 12/02/20 - 12/29/20 < 0.8 < 0.9 MEAN - -

C-1

Table C-I.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 1LL 01/01/20 - 01/29/20 < 7 < 6 < 11 < 6 < 8 < 6 < 9 < 6 < 6 < 22 < 10 01/29/20 - 02/26/20 < 7 < 8 < 15 < 9 < 15 < 8 < 10 < 8 < 6 < 32 < 12 02/26/20 - 04/01/20 < 6 < 5 < 12 < 6 < 12 < 5 < 10 < 7 < 5 < 25 < 8 04/01/20 - 04/29/20 < 6 < 6 < 13 < 7 < 9 < 6 < 14 < 7 < 7 < 31 < 10 04/29/20 - 05/27/20 < 4 < 4 < 11 < 5 < 5 < 5 < 9 < 4 < 4 < 25 < 8 05/27/20 - 07/01/20 < 5 < 5 < 10 < 5 < 13 < 6 < 11 < 7 < 6 < 26 < 7 07/01/20 - 07/29/20 < 6 < 7 < 18 < 9 < 9 < 7 < 13 < 8 < 8 < 30 < 11 07/29/20 - 09/02/20 < 6 < 7 < 10 < 5 < 7 < 5 < 12 < 8 < 6 < 31 < 8 09/02/20 - 09/30/20 < 5 < 4 < 11 < 6 < 8 < 6 < 10 < 6 < 5 < 21 < 8 09/30/20 - 10/28/20 < 5 < 9 < 13 < 7 < 10 < 8 < 12 < 8 < 6 < 33 < 9 10/28/20 - 12/02/20 < 5 < 6 < 9 < 6 < 6 < 5 < 9 < 5 < 5 < 27 < 6 12/02/20 - 12/29/20 < 5 < 6 < 10 < 5 < 11 < 6 < 10 < 5 < 5 < 29 < 10 C-2 MEAN - - - - - - - - - - -

1MM 01/01/20 - 01/29/20 < 6 < 7 < 12 < 6 < 13 < 8 < 12 < 9 < 7 < 29 < 11 01/29/20 - 02/26/20 < 6 < 6 < 12 < 6 < 11 < 7 < 11 < 7 < 7 < 32 < 9 02/26/20 - 04/01/20 < 5 < 6 < 14 < 6 < 15 < 6 < 8 < 6 < 7 < 29 < 8 04/01/20 - 04/29/20 < 5 < 7 < 12 < 6 < 13 < 6 < 13 < 8 < 5 < 32 < 13 04/29/20 - 05/27/20 < 4 < 5 < 9 < 5 < 8 < 5 < 8 < 6 < 5 < 24 < 8 05/27/20 - 07/01/20 < 5 < 8 < 11 < 8 < 12 < 7 < 9 < 9 < 5 < 28 < 9 07/01/20 - 07/29/20 < 7 < 8 < 15 < 13 < 17 < 6 < 12 < 7 < 9 < 31 < 12 07/29/20 - 09/02/20 < 6 < 7 < 13 < 6 < 12 < 7 < 11 < 7 < 6 < 29 < 11 09/02/20 - 09/30/20 < 5 < 4 < 12 < 4 < 11 < 6 < 11 < 6 < 6 < 29 < 7 09/30/20 - 10/28/20 < 7 < 6 < 15 < 8 < 11 < 6 < 13 < 5 < 8 < 33 < 11 10/28/20 - 12/02/20 < 6 < 5 < 14 < 5 < 12 < 6 < 9 < 7 < 5 < 23 < 9 12/02/20 - 12/29/20 < 8 < 7 < 15 < 10 < 14 < 8 < 14 < 10 < 7 < 27 < 11 MEAN - - - - - - - - - - -

Table C-II.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 13B 4L 6I 12/30/19 - 01/30/20 < 1.8 < 1.8 2.6 +/- 1.3 01/27/20 - 02/26/20 3.7 +/- 1.4 2.0 +/- 1.3 < 1.9 02/24/20 - 04/02/20 2.4 +/- 1.2 1.7 +/- 1.2 1.9 +/- 1.2 03/30/20 - 04/30/20 < 1.7 < 1.7 < 1.7 04/27/20 - 05/27/20 < 1.9 < 1.9 < 2.0 05/26/20 - 07/01/20 2.1 +/- 1.4 < 2.0 < 2.0 06/29/20 - 07/29/20 < 2.2 < 2.2 2.7 +/- 1.6 07/27/20 - 09/02/20 < 2.4 < 2.5 < 2.6 08/31/20 - 10/01/20 2.7 +/- 1.5 4.5 +/- 1.7 3.6 +/- 1.6 09/28/20 - 10/29/20 3.9 +/- 1.7 4.0 +/- 1.7 3.0 +/- 1.6 10/26/20 - 12/02/20 3.2 +/- 1.6 4.5 +/- 1.7 < 2.2 11/30/20 - 12/29/20 2.4 +/- 1.5 4.5 +/- 1.5 < 2.0 MEAN +/- 2 STD DEV 2.9 +/- 1.4 3.5 +/- 2.6 2.8 +/- 1.3 Table C-II.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 13B 4L 6I 12/30/19 - 04/02/20 < 183 < 185 < 182 03/30/20 - 07/01/20 < 186 < 185 < 184 06/29/20 - 10/01/20 < 173 < 168 < 173 09/28/20 - 12/29/20 < 187 < 183 < 186 MEAN - - -

Table C-II.3 CONCENTRATIONS OF LOW LEVEL I-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 13B 4L 6I 12/30/19 - 01/30/20 < 0.8 < 0.8 < 0.7 01/27/20 - 02/26/20 < 0.9 < 0.7 < 0.8 02/24/20 - 04/02/20 < 0.6 < 0.5 < 0.6 03/30/20 - 04/30/20 < 0.7 < 0.7 < 0.6 04/27/20 - 05/27/20 < 0.9 < 0.7 < 0.7 05/26/20 - 07/01/20 < 0.9 < 0.7 < 0.8 06/29/20 - 07/29/20 < 0.9 < 0.5 < 0.8 07/27/20 - 09/02/20 < 0.9 < 0.9 < 0.7 08/31/20 - 10/01/20 < 0.7 < 0.8 < 0.9 09/28/20 - 10/29/20 < 0.9 < 0.9 < 0.7 10/26/20 - 12/02/20 < 0.8 < 0.9 < 0.8 11/30/20 - 12/29/20 < 0.9 < 0.8 < 0.8 MEAN - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-3

Table C-II.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 13B 12/30/19 - 01/27/20 < 6 < 7 < 12 < 5 < 13 < 6 < 10 < 6 < 7 < 33 < 9 01/27/20 - 02/24/20 < 6 < 5 < 12 < 6 < 10 < 6 < 9 < 6 < 5 < 27 < 7 02/24/20 - 03/30/20 < 6 < 5 < 12 < 8 < 10 < 5 < 9 < 5 < 6 < 24 < 6 03/30/20 - 04/27/20 < 5 < 6 < 10 < 6 < 14 < 6 < 9 < 7 < 7 < 25 < 12 04/27/20 - 05/26/20 < 6 < 7 < 12 < 8 < 9 < 7 < 12 < 7 < 7 < 36 < 10 05/26/20 - 06/29/20 < 4 < 4 < 10 < 5 < 8 < 5 < 8 < 5 < 4 < 21 < 6 06/29/20 - 07/27/20 < 6 < 5 < 10 < 6 < 10 < 7 < 12 < 5 < 6 < 25 < 8 07/27/20 - 08/31/20 < 7 < 8 < 11 < 9 < 13 < 7 < 12 < 8 < 6 < 35 < 12 08/31/20 - 09/28/20 < 5 < 6 < 10 < 5 < 10 < 6 < 11 < 6 < 5 < 31 < 9 09/28/20 - 10/26/20 < 8 < 4 < 14 < 7 < 9 < 5 < 12 < 8 < 6 < 36 < 9 10/26/20 - 11/30/20 < 4 < 5 < 10 < 6 < 10 < 6 < 8 < 6 < 5 < 24 < 7 11/30/20 - 12/28/20 < 6 < 6 < 12 < 7 < 14 < 7 < 11 < 7 < 6 < 27 < 13 MEAN - - - - - - - - - - -

4L 01/02/20 - 01/30/20 < 5 < 5 < 12 < 5 < 12 < 7 < 9 < 8 < 7 < 26 < 9 01/30/20 - 02/26/20 < 5 < 5 < 12 < 6 < 10 < 6 < 7 < 7 < 5 < 24 < 11 02/26/20 - 04/02/20 < 7 < 8 < 14 < 8 < 16 < 7 < 12 < 8 < 7 < 29 < 8 C-4 04/02/20 - 04/30/20 < 7 < 8 < 16 < 8 < 12 < 7 < 13 < 6 < 8 < 31 < 11 04/30/20 - 05/27/20 < 6 < 5 < 16 < 9 < 9 < 7 < 14 < 9 < 6 < 24 < 11 05/27/20 - 07/01/20 < 7 < 8 < 14 < 9 < 16 < 8 < 13 < 9 < 8 < 33 < 13 07/01/20 - 07/29/20 < 7 < 5 < 18 < 11 < 11 < 7 < 10 < 8 < 8 < 25 < 13 07/29/20 - 09/02/20 < 5 < 4 < 10 < 4 < 12 < 6 < 11 < 7 < 6 < 29 < 8 09/02/20 - 10/01/20 < 8 < 6 < 17 < 10 < 13 < 6 < 12 < 5 < 6 < 21 < 12 10/01/20 - 10/29/20 < 3 < 6 < 10 < 4 < 12 < 7 < 11 < 6 < 5 < 28 < 8 10/29/20 - 12/02/20 < 6 < 6 < 10 < 6 < 12 < 6 < 11 < 6 < 5 < 22 < 8 12/02/20 - 12/29/20 < 7 < 6 < 16 < 8 < 12 < 9 < 14 < 7 < 7 < 31 < 10 MEAN - - - - - - - - - - -

6I 01/02/20 - 01/30/20 < 7 < 8 < 15 < 9 < 13 < 7 < 15 < 7 < 8 < 34 < 9 01/30/20 - 02/26/20 < 6 < 6 < 13 < 7 < 15 < 8 < 12 < 6 < 6 < 27 < 13 02/26/20 - 04/01/20 < 7 < 6 < 14 < 5 < 14 < 6 < 11 < 4 < 7 < 25 < 8 04/01/20 - 04/30/20 < 7 < 6 < 16 < 8 < 14 < 7 < 15 < 6 < 9 < 36 < 9 04/30/20 - 05/27/20 < 4 < 5 < 10 < 5 < 7 < 4 < 10 < 5 < 5 < 20 < 7 05/27/20 - 07/01/20 < 5 < 8 < 16 < 9 < 13 < 8 < 13 < 8 < 7 < 36 < 11 07/01/20 - 07/29/20 < 7 < 8 < 16 < 11 < 13 < 7 < 14 < 8 < 8 < 28 < 10 07/29/20 - 09/02/20 < 6 < 6 < 12 < 8 < 11 < 6 < 11 < 6 < 5 < 24 < 7 09/02/20 - 10/01/20 < 5 < 6 < 8 < 7 < 9 < 6 < 11 < 7 < 6 < 31 < 11 10/01/20 - 10/29/20 < 6 < 6 < 12 < 7 < 11 < 6 < 8 < 5 < 6 < 27 < 8 10/29/20 - 12/02/20 < 8 < 7 < 12 < 8 < 4 < 7 < 12 < 7 < 6 < 22 < 10 12/02/20 - 12/29/20 < 6 < 7 < 15 < 8 < 16 < 7 < 13 < 8 < 6 < 29 < 9 MEAN - - - - - - - - - - -

Table C-III.1 CONCENTRATIONS OF GAMMA EMITTERS IN PREDATOR AND BOTTOM FEEDER (FISH)

SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 4 05/21/20 3443 +/- 1024 < 80 < 62 < 159 < 90 < 152 < 71 < 73 PREDATOR 10/08/20 3631 +/- 910 < 59 < 58 < 122 < 62 < 139 < 63 < 60 MEAN +/- 2 STD DEV 3537 +/- 266 - - - - - - -

4 05/21/20 3210 +/- 968 < 102 < 107 < 170 < 72 < 174 < 77 < 100 BOTTOM FEEDER 10/08/20 3356 +/- 1119 < 76 < 64 < 137 < 64 < 113 < 74 < 81 MEAN +/- 2 STD DEV 3283 +/- 206 - - - - - - -

6 06/03/20 3104 +/- 992 < 59 < 64 < 136 < 65 < 131 < 79 < 56 PREDATOR 10/22/20 3211 +/- 848 < 49 < 42 < 76 < 41 < 105 < 61 < 59 MEAN +/- 2 STD DEV 3158 +/- 151 - - - - - - -

C-5 6 06/03/20 3101 +/- 1006 < 57 < 42 < 82 < 54 < 106 < 50 < 61 BOTTOM FEEDER 10/22/20 3112 +/- 688 < 48 < 40 < 83 < 40 < 97 < 49 < 37 MEAN +/- 2 STD DEV 3107 +/- 16 - - - - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Mn-54 Co-58 Co-60 Cs-134 Cs-137 4J 06/17/20 11300 +/- 1370 < 66 < 55 < 61 < 70 < 59 12/03/20 13020 +/- 1232 < 41 < 42 < 47 < 55 < 41 MEAN +/- 2 STD DEV 12160 +/- 2432 - - - - -

4T 06/17/20 19980 +/- 2408 < 109 < 100 < 85 < 135 < 119 12/03/20 18190 +/- 2024 < 109 < 116 < 113 < 123 < 130 MEAN +/- 2 STD DEV 19085 +/- 2531 - - - - -

6F 06/17/20 17400 +/- 2125 < 118 < 110 < 132 < 137 < 130 12/03/20 13990 +/- 1752 < 84 < 71 < 76 < 81 < 98 MEAN +/- 2 STD DEV 15695 +/- 4822 - - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-6

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CUBIC METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD 1B 1C 1Z 3A 5H2 12/30/19 - 01/06/20 12 +/- 4 01/02/20 - 01/08/20 10 +/- 4 18 +/- 5 9 +/- 4 12 +/- 5 01/06/20 - 01/13/20 14 +/- 4 01/08/20 - 01/16/20 12 +/- 4 16 +/- 4 9 +/- 3 15 +/- 4 01/13/20 - 01/21/20 18 +/- 3 01/16/20 - 01/23/20 22 +/- 5 15 +/- 4 20 +/- 5 25 +/- 5 01/21/20 - 01/27/20 15 +/- 4 01/23/20 - 01/30/20 9 +/- 3 10 +/- 3 7 +/- 3 10 +/- 3 01/27/20 - 02/03/20 12 +/- 4 01/30/20 - 02/06/20 18 +/- 4 17 +/- 4 12 +/- 4 15 +/- 4 02/03/20 - 02/10/20 13 +/- 4 02/06/20 - 02/12/20 10 +/- 5 13 +/- 5 7 +/- 4 9 +/- 4 02/10/20 - 02/17/20 12 +/- 4 02/12/20 - 02/20/20 17 +/- 4 11 +/- 3 15 +/- 3 18 +/- 4 02/17/20 - 02/24/20 26 +/- 5 02/20/20 - 02/26/20 24 +/- 5 25 +/- 5 18 +/- 5 26 +/- 5 02/24/20 - 03/02/20 16 +/- 4 02/26/20 - 03/05/20 13 +/- 3 13 +/- 3 9 +/- 3 14 +/- 3 03/02/20 - 03/09/20 11 +/- 3 03/05/20 - 03/11/20 12 +/- 5 14 +/- 5 9 +/- 4 13 +/- 5 03/09/20 - 03/16/20 17 +/- 4 03/11/20 - 03/19/20 19 +/- 4 16 +/- 4 11 +/- 3 18 +/- 4 03/16/20 - 03/23/20 15 +/- 4 03/19/20 - 03/25/20 20 +/- 5 18 +/- 4 16 +/- 4 15 +/- 4 03/23/20 - 03/30/20 7 +/- 4 03/25/20 - 04/02/20 11 +/- 3 11 +/- 3 8 +/- 3 11 +/- 3 03/30/20 - 04/06/20 12 +/- 4 04/02/20 - 04/08/20 15 +/- 5 12 +/- 4 12 +/- 4 11 +/- 4 04/06/20 - 04/13/20 15 +/- 4 04/08/20 - 04/15/20 12 +/- 4 11 +/- 3 9 +/- 3 12 +/- 4 04/13/20 - 04/20/20 14 +/- 4 04/15/20 - 04/23/20 17 +/- 4 17 +/- 4 13 +/- 3 14 +/- 4 04/20/20 - 04/27/20 10 +/- 3 04/23/20 - 04/30/20 12 +/- 4 13 +/- 4 10 +/- 3 9 +/- 3 04/27/20 - 05/04/20 13 +/- 4 04/30/20 - 05/07/20 10 +/- 3 10 +/- 3 11 +/- 4 11 +/- 3 05/04/20 - 05/11/20 12 +/- 4 05/07/20 - 05/14/20 12 +/- 4 10 +/- 4 7 +/- 4 10 +/- 4 05/11/20 - 05/18/20 19 +/- 4 05/14/20 - 05/20/20 19 +/- 5 17 +/- 5 13 +/- 4 16 +/- 5 05/18/20 - 05/26/20 9 +/- 3 05/20/20 - 05/27/20 10 +/- 4 7 +/- 3 6 +/- 3 9 +/- 3 05/26/20 - 06/02/20 10 +/- 4 05/27/20 - 06/04/20 (1) 9 +/- 3 8 +/- 3 11 +/- 4 06/02/20 - 06/08/20 21 +/- 5 06/04/20 - 06/11/20 12 +/- 4 13 +/- 4 6 +/- 3 13 +/- 4 06/08/20 - 06/15/20 11 +/- 3 06/11/20 - 06/18/20 11 +/- 3 9 +/- 3 6 +/- 3 8 +/- 3 06/15/20 - 06/22/20 10 +/- 4 06/18/20 - 06/25/20 16 +/- 4 12 +/- 4 9 +/- 4 8 +/- 3 06/22/20 - 06/29/20 18 +/- 4 06/25/20 - 07/01/20 15 +/- 5 10 +/- 5 < 6 9 +/- 5 06/29/20 - 07/06/20 15 +/- 4 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-7

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CUBIC METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD 1B 1C 1Z 3A 5H2 07/01/20 - 07/09/20 12 +/- 3 12 +/- 3 9 +/- 3 12 +/- 3 07/06/20 - 07/13/20 16 +/- 4 07/09/20 - 07/16/20 14 +/- 4 13 +/- 4 7 +/- 4 10 +/- 4 07/13/20 - 07/20/20 17 +/- 4 07/16/20 - 07/23/20 20 +/- 5 17 +/- 4 11 +/- 4 16 +/- 4 07/20/20 - 07/28/20 21 +/- 4 07/23/20 - 07/29/20 18 +/- 5 25 +/- 5 12 +/- 4 13 +/- 5 07/28/20 - 08/04/20 18 +/- 4 07/29/20 - 08/06/20 19 +/- 4 17 +/- 4 12 +/- 4 17 +/- 5 08/04/20 - 08/10/20 18 +/- 5 08/06/20 - 08/13/20 25 +/- 5 23 +/- 5 20 +/- 5 19 +/- 4 08/10/20 - 08/17/20 28 +/- 5 08/13/20 - 08/20/20 19 +/- 4 16 +/- 4 14 +/- 4 19 +/- 5 08/17/20 - 08/24/20 18 +/- 4 08/20/20 - 08/27/20 29 +/- 5 26 +/- 5 18 +/- 5 26 +/- 5 08/24/20 - 08/31/20 19 +/- 5 08/27/20 - 09/02/20 14 +/- 4 14 +/- 4 11 +/- 4 16 +/- 5 08/31/20 - 09/08/20 20 +/- 4 09/02/20 - 09/10/20 17 +/- 4 13 +/- 4 14 +/- 6 17 +/- 4 09/08/20 - 09/14/20 13 +/- 4 09/10/20 - 09/16/20 10 +/- 4 9 +/- 4 8 +/- 4 13 +/- 4 09/14/20 - 09/21/20 17 +/- 4 09/16/20 - 09/24/20 31 +/- 5 21 +/- 4 18 +/- 4 25 +/- 4 09/21/20 - 09/29/20 30 +/- 4 09/24/20 - 10/01/20 24 +/- 5 26 +/- 5 18 +/- 4 25 +/- 5 09/29/20 - 10/05/20 12 +/- 4 10/01/20 - 10/08/20 27 +/- 5 17 +/- 4 16 +/- 4 22 +/- 4 10/05/20 - 10/12/20 24 +/- 4 10/08/20 - 10/14/20 17 +/- 5 14 +/- 4 10 +/- 4 12 +/- 5 10/12/20 - 10/19/20 11 +/- 4 10/14/20 - 10/21/20 19 +/- 5 22 +/- 5 14 +/- 4 17 +/- 5 10/19/20 - 10/26/20 8 +/- 4 10/21/20 - 10/29/20 12 +/- 3 11 +/- 3 10 +/- 3 11 +/- 3 10/26/20 - 11/03/20 8 +/- 3 10/29/20 - 11/05/20 16 +/- 4 18 +/- 4 17 +/- 4 21 +/- 4 11/03/20 - 11/10/20 33 +/- 5 11/05/20 - 11/12/20 21 +/- 5 21 +/- 5 25 +/- 5 25 +/- 5 11/10/20 - 11/16/20 20 +/- 5 11/12/20 - 11/18/20 20 +/- 5 18 +/- 5 19 +/- 5 28 +/- 5 11/16/20 - 11/23/20 20 +/- 4 11/18/20 - 11/25/20 17 +/- 4 21 +/- 5 19 +/- 5 23 +/- 5 11/23/20 - 12/01/20 21 +/- 4 11/25/20 - 12/02/20 20 +/- 4 27 +/- 5 24 +/- 5 26 +/- 5 12/01/20 - 12/07/20 15 +/- 5 12/02/20 - 12/09/20 10 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 12/07/20 - 12/14/20 31 +/- 5 12/09/20 - 12/15/20 25 +/- 5 24 +/- 5 28 +/- 6 30 +/- 6 12/14/20 - 12/21/20 14 +/- 4 12/15/20 - 12/22/20 15 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 12/21/20 - 12/28/20 15 +/- 4 12/22/20 - 12/29/20 15 +/- 4 19 +/- 4 19 +/- 4 16 +/- 4 MEAN +/- 2 STD DEV 17 +/- 11 16 +/- 10 13 +/- 10 16 +/- 12 16 +/- 12 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-8

Table C-V.2 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CUBIC METER +/- 2 SIGMA COLLECTION SITE PERIOD Be-7 Mn-54 Co-58 Co-60 Cs-134 Cs-137 1B 01/02/20 - 04/02/20 80 +/- 25 < 4 < 4 < 3 < 3 < 3 04/02/20 - 07/01/20 69 +/- 21 < 2 < 2 < 2 < 2 < 2 07/01/20 - 10/01/20 83 +/- 20 < 3 < 3 < 4 < 3 < 3 10/01/20 - 12/29/20 80 +/- 20 < 2 < 2 < 3 < 3 < 3 MEAN +/- 2 STD DEV 78 +/- 12 - - - - -

1C 01/02/20 - 04/02/20 80 +/- 18 < 2 < 3 < 2 < 2 < 2 04/02/20 - 07/01/20 93 +/- 20 < 1 < 2 < 2 < 1 < 1 07/01/20 - 10/01/20 85 +/- 25 < 2 < 3 < 2 < 3 < 3 10/01/20 - 12/29/20 85 +/- 18 < 2 < 2 < 3 < 2 < 2 MEAN +/- 2 STD DEV 86 +/- 11 - - - - -

1Z 01/02/20 - 04/02/20 54 +/- 16 < 2 < 2 < 3 < 3 < 2 04/02/20 - 07/01/20 68 +/- 17 < 2 < 2 < 2 < 3 < 2 07/01/20 - 10/01/20 59 +/- 17 < 2 < 2 < 2 < 2 < 2 10/01/20 - 12/29/20 74 +/- 17 < 2 < 2 < 2 < 2 < 2 MEAN +/- 2 STD DEV 64 +/- 18 - - - - -

3A 01/02/20 - 04/02/20 73 +/- 17 < 2 < 2 < 2 < 3 < 3 04/02/20 - 07/01/20 78 +/- 18 < 2 < 1 < 2 < 2 < 2 07/01/20 - 10/01/20 85 +/- 22 < 2 < 2 < 2 < 2 < 2 10/01/20 - 12/29/20 98 +/- 23 < 2 < 3 < 3 < 2 < 2 MEAN +/- 2 STD DEV 83 +/- 22 - - - - -

5H2 12/30/19 - 03/30/20 85 +/- 18 < 2 < 2 < 1 < 2 < 1 03/30/20 - 06/29/20 96 +/- 25 < 4 < 4 < 5 < 3 < 3 06/29/20 - 09/29/20 116 +/- 22 < 2 < 2 < 2 < 2 < 2 09/29/20 - 12/28/20 69 +/- 16 < 2 < 2 < 1 < 3 < 2 MEAN +/- 2 STD DEV 92 +/- 40 - - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-9

Table C-VI.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CUBIC METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD 1B 1C 1Z 3A 5H2 12/30/19 - 01/06/20 < 15 01/02/20 - 01/08/20 < 56 < 56 < 56 < 57 01/06/20 - 01/13/20 < 14 01/08/20 - 01/16/20 < 19 < 18 < 18 < 18 01/13/20 - 01/21/20 < 11 01/16/20 - 01/23/20 < 54 < 55 < 55 < 55 01/21/20 - 01/27/20 < 17 01/23/20 - 01/30/20 < 56 < 56 < 56 < 56 01/27/20 - 02/03/20 < 12 01/30/20 - 02/06/20 < 25 < 25 < 25 < 25 02/03/20 - 02/10/20 < 46 02/06/20 - 02/12/20 < 27 < 27 < 27 < 27 02/10/20 - 02/17/20 < 21 02/12/20 - 02/20/20 < 24 < 24 < 24 < 24 02/17/20 - 02/24/20 < 18 02/20/20 - 02/26/20 < 42 < 42 < 42 < 41 02/24/20 - 03/02/20 < 31 02/26/20 - 03/05/20 < 25 < 25 < 25 < 25 03/02/20 - 03/09/20 < 17 03/05/20 - 03/11/20 < 38 < 39 < 39 < 39 03/09/20 - 03/16/20 < 20 03/11/20 - 03/19/20 < 61 < 59 < 59 < 58 03/16/20 - 03/23/20 < 23 03/19/20 - 03/25/20 < 17 < 35 < 35 < 35 03/23/20 - 03/30/20 < 20 03/25/20 - 04/02/20 < 47 < 47 < 47 < 47 03/30/20 - 04/06/20 < 27 04/02/20 - 04/08/20 < 66 < 55 < 60 < 66 04/06/20 - 04/13/20 < 17 04/08/20 - 04/15/20 < 57 < 45 < 50 < 56 04/13/20 - 04/20/20 < 21 04/15/20 - 04/23/20 < 48 < 49 < 49 < 49 04/20/20 - 04/27/20 < 11 04/23/20 - 04/30/20 < 29 < 29 < 29 < 16 04/27/20 - 05/04/20 < 17 04/30/20 - 05/07/20 < 24 < 24 < 24 < 24 05/04/20 - 05/11/20 < 15 05/07/20 - 05/14/20 < 24 < 24 < 24 < 24 05/11/20 - 05/18/20 < 32 05/14/20 - 05/20/20 < 56 < 55 < 55 < 54 05/18/20 - 05/26/20 < 24 05/20/20 - 05/27/20 < 22 < 33 < 33 < 33 05/26/20 - 06/02/20 < 34 05/27/20 - 06/04/20 (1) < 28 < 28 < 28 06/02/20 - 06/08/20 < 17 06/04/20 - 06/11/20 < 35 < 35 < 35 < 35 06/08/20 - 06/15/20 < 13 06/11/20 - 06/18/20 < 52 < 52 < 52 < 52 06/15/20 - 06/22/20 < 26 06/18/20 - 06/25/20 < 18 < 32 < 32 < 32 06/22/20 - 06/29/20 < 38 06/25/20 - 07/01/20 < 24 < 14 < 24 < 24 06/29/20 - 07/06/20 < 27 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-10

Table C-VI.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CUBIC METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD 1B 1C 1Z 3A 5H2 07/01/20 - 07/09/20 < 48 < 49 < 49 < 20 07/06/20 - 07/13/20 < 14 07/09/20 - 07/16/20 < 17 < 31 < 31 < 31 07/13/20 - 07/20/20 < 10 07/16/20 - 07/23/20 < 40 < 41 < 40 < 41 07/20/20 - 07/28/20 < 32 07/23/20 - 07/29/20 < 53 < 52 < 53 < 52 07/28/20 - 08/04/20 < 17 07/29/20 - 08/06/20 < 33 < 27 < 38 < 43 08/04/20 - 08/10/20 < 22 08/06/20 - 08/13/20 < 49 < 48 < 48 < 47 08/10/20 - 08/17/20 < 17 08/13/20 - 08/20/20 < 48 < 48 < 49 < 27 08/17/20 - 08/24/20 < 19 08/20/20 - 08/27/20 < 17 < 40 < 40 < 40 08/24/20 - 08/31/20 < 17 08/27/20 - 09/02/20 < 48 < 23 < 48 < 51 08/31/20 - 09/08/20 < 20 09/02/20 - 09/10/20 < 27 < 27 < 45 < 27 09/08/20 - 09/14/20 < 20 09/10/20 - 09/16/20 < 36 < 33 < 33 < 33 09/14/20 - 09/21/20 < 16 09/16/20 - 09/24/20 < 47 < 43 < 52 < 47 09/21/20 - 09/29/20 < 13 09/24/20 - 10/01/20 < 25 < 23 < 23 < 25 09/29/20 - 10/05/20 < 18 10/01/20 - 10/08/20 < 51 < 47 < 20 < 52 10/05/20 - 10/12/20 < 37 10/08/20 - 10/14/20 < 59 < 54 < 22 < 59 10/12/20 - 10/19/20 < 45 10/14/20 - 10/21/20 < 60 < 60 < 60 < 60 10/19/20 - 10/26/20 < 13 10/21/20 - 10/29/20 < 51 < 46 < 51 < 51 10/26/20 - 11/03/20 < 13 10/29/20 - 11/05/20 < 51 < 52 < 51 < 21 11/03/20 - 11/10/20 < 15 11/05/20 - 11/12/20 < 41 < 41 < 41 < 41 11/10/20 - 11/16/20 < 14 11/12/20 - 11/18/20 < 15 < 36 < 36 < 34 11/16/20 - 11/23/20 < 64 11/18/20 - 11/25/20 < 34 < 37 < 37 < 34 11/23/20 - 12/01/20 < 22 11/25/20 - 12/02/20 < 22 < 25 < 25 < 22 12/01/20 - 12/07/20 < 38 12/02/20 - 12/09/20 < 59 < 59 < 59 < 60 12/07/20 - 12/14/20 < 23 12/09/20 - 12/15/20 < 48 < 48 < 48 < 47 12/14/20 - 12/21/20 < 53 12/15/20 - 12/22/20 < 36 < 36 < 35 < 29 12/21/20 - 12/28/20 < 23 12/22/20 - 12/29/20 < 34 < 41 < 41 < 41 MEAN - - - - -

C-11

Table C-VII.1 CONCENTRATIONS OF LOW LEVEL I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARMS INDICATOR FARMS WEEK C E V D J P R S U W X Y 01/13/20 < 0.5 < 0.6 < 0.6 < 0.8 < 0.7 < 0.5 02/13/20 < 0.9 < 0.5 < 0.8 < 0.6 < 0.7 < 0.8 < 0.7 < 0.7 < 0.8 < 0.7 < 0.9 < 0.5 03/10/20 < 0.7 < 0.7 < 0.8 < 0.6 < 0.7 < 0.8 04/07/21 < 0.6 < 0.6 < 0.8 < 0.7 < 0.6 < 0.6 04/21/20 < 0.7 < 0.7 < 0.7 < 0.7 < 0.7 < 0.7 05/05/20 < 0.7 < 0.8 < 0.7 < 0.7 < 0.7 < 0.7 < 0.7 < 0.6 < 0.6 < 0.7 < 0.7 < 0.6 05/19/20 < 0.7 < 0.7 < 0.7 < 0.7 < 0.7 < 0.6 06/02/20 < 0.7 < 0.8 < 0.7 < 0.7 < 0.7 < 0.9 06/16/20 < 0.9 < 0.8 < 0.8 < 0.8 < 0.9 < 1.0 06/30/20 < 0.9 < 0.9 < 0.8 < 0.9 < 0.7 < 0.6 07/14/20 < 0.7 < 0.8 < 0.8 < 0.6 < 0.6 < 0.9 07/28/20 < 0.7 < 0.9 < 0.9 < 0.7 < 0.8 < 0.9 08/11/20 < 0.8 < 0.9 < 0.9 < 0.8 < 0.9 < 0.8 < 0.7 < 0.8 < 0.9 < 0.7 < 0.9 < 0.7 C-12 08/25/20 < 0.8 < 0.7 < 0.8 < 0.7 < 0.9 < 0.7 09/09/20 < 0.8 < 0.9 < 0.8 < 0.9 < 0.8 < 0.8 09/22/21 < 0.7 < 0.8 < 0.8 < 0.8 < 0.8 < 0.8 10/05/20 < 0.9 < 0.8 < 0.8 < 0.9 < 1.0 < 0.8 10/21/20 < 0.8 < 0.9 < 0.9 < 0.7 < 0.8 < 0.7 11/02/20 < 0.7 < 0.8 < 0.8 < 0.8 < 0.9 < 0.5 < 0.9 < 0.9 < 0.8 < 0.9 < 0.7 < 0.8 11/17/20 < 0.9 < 0.9 < 0.8 < 0.9 < 0.8 < 0.9 12/15/20 < 0.9 < 0.9 < 0.8 < 0.9 < 0.8 < 0.9 MEAN - - - - - - - - - - - -

`

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Cs-134 Cs-137 Ba-140 La-140 C 02/13/20 1148 +/- 174 < 9 < 7 < 36 < 8 05/05/20 1270 +/- 159 < 7 < 6 < 35 < 6 08/11/20 1243 +/- 175 < 7 < 7 < 33 < 11 11/02/20 1134 +/- 187 < 9 < 8 < 41 < 13 MEAN +/- 2 STD DEV 1199 +/- 136 - - - -

E 02/14/20 1144 +/- 183 < 6 < 8 < 27 < 7 05/06/20 1391 +/- 112 < 5 < 5 < 18 < 6 08/11/20 1186 +/- 187 < 10 < 9 < 42 < 12 11/02/20 1328 +/- 180 < 8 < 7 < 32 < 9 MEAN +/- 2 STD DEV 1262 +/- 233 - - - -

V 01/13/20 1203 +/- 123 < 5 < 4 < 14 < 5 02/14/20 1195 +/- 153 < 8 < 8 < 32 < 7 03/10/20 1163 +/- 173 < 7 < 7 < 22 < 8 04/07/20 1315 +/- 181 < 9 < 7 < 37 < 9 04/21/20 1157 +/- 164 < 8 < 7 < 28 < 10 05/05/20 1266 +/- 180 < 9 < 8 < 38 < 14 05/19/20 1066 +/- 151 < 9 < 7 < 35 < 13 06/02/20 1244 +/- 180 < 8 < 7 < 27 < 8 06/16/20 1237 +/- 150 < 8 < 9 < 37 < 11 06/30/20 1166 +/- 194 < 10 < 8 < 31 < 11 07/14/20 1043 +/- 166 < 9 < 9 < 44 < 13 07/28/20 1152 +/- 204 < 11 < 8 < 31 < 8 08/11/20 1320 +/- 165 < 9 < 8 < 36 < 8 08/25/20 1299 +/- 217 < 9 < 8 < 33 < 10 09/09/20 1334 +/- 182 < 8 < 6 < 30 < 9 09/22/20 1284 +/- 184 < 7 < 7 < 28 < 8 10/05/20 1404 +/- 174 < 8 < 7 < 28 < 10 10/21/20 1360 +/- 181 < 9 < 9 < 40 < 6 11/02/20 1239 +/- 185 < 8 < 7 < 33 < 13 11/17/20 1388 +/- 224 < 8 < 10 < 28 < 10 12/15/20 1229 +/- 185 < 7 < 8 < 30 < 6 MEAN +/- 2 STD DEV 1241 +/- 194 - - - -

D 02/13/20 1415 +/- 208 < 8 < 7 < 33 < 10 05/05/20 1263 +/- 160 < 9 < 8 < 34 < 12 08/11/20 1261 +/- 185 < 8 < 8 < 31 < 7 11/02/20 1583 +/- 191 < 12 < 8 < 46 < 12 MEAN +/- 2 STD DEV 1381 +/- 306 - - - -

C-13

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Cs-134 Cs-137 Ba-140 La-140 J 01/14/20 1190 +/- 127 < 6 < 6 < 23 < 6 02/13/20 1159 +/- 162 < 8 < 7 < 28 < 9 03/10/20 1282 +/- 186 < 8 < 8 < 31 < 5 04/08/20 1231 +/- 151 < 10 < 9 < 34 < 14 04/23/20 1168 +/- 149 < 8 < 7 < 29 < 7 05/06/20 1229 +/- 184 < 9 < 8 < 37 < 10 05/20/20 1295 +/- 156 < 7 < 8 < 31 < 9 06/02/20 1179 +/- 154 < 10 < 9 < 38 < 12 06/17/20 1334 +/- 172 < 8 < 7 < 31 < 10 06/30/20 1181 +/- 178 < 9 < 7 < 48 < 8 07/14/20 1363 +/- 195 < 8 < 8 < 38 < 15 07/28/20 1123 +/- 176 < 10 < 8 < 28 < 9 08/11/20 1350 +/- 198 < 8 < 10 < 34 < 12 08/25/20 1183 +/- 172 < 8 < 9 < 36 < 8 09/09/20 1207 +/- 191 < 12 < 7 < 37 < 5 09/22/20 1190 +/- 159 < 6 < 7 < 24 < 7 10/05/20 1345 +/- 157 < 8 < 7 < 24 < 9 10/21/20 1479 +/- 181 < 9 < 8 < 36 < 9 11/02/20 1226 +/- 175 < 9 < 10 < 30 < 13 11/17/20 1334 +/- 163 < 9 < 9 < 36 < 11 12/15/20 1373 +/- 172 < 9 < 8 < 35 < 13 MEAN +/- 2 STD DEV 1258 +/- 185 - - - -

P 02/13/20 1144 +/- 148 < 7 < 6 < 26 < 9 05/05/20 1246 +/- 130 < 7 < 6 < 25 < 6 08/11/20 1272 +/- 159 < 8 < 7 < 27 < 5 11/02/20 1294 +/- 147 < 9 < 7 < 38 < 9 MEAN +/- 2 STD DEV 1239 +/- 133 - - - -

R 01/14/20 1161 +/- 128 < 7 < 5 < 16 < 5 02/13/20 1102 +/- 126 < 7 < 7 < 28 < 6 03/10/20 1265 +/- 162 < 9 < 8 < 28 < 10 04/08/20 1144 +/- 217 < 11 < 10 < 36 < 11 04/21/20 1357 +/- 140 < 7 < 6 < 26 < 8 05/05/20 1228 +/- 212 < 8 < 8 < 37 < 9 05/19/20 1254 +/- 174 < 7 < 7 < 28 < 10 06/02/20 1254 +/- 167 < 7 < 6 < 30 < 7 06/16/20 1349 +/- 180 < 8 < 8 < 37 < 14 06/30/20 1198 +/- 156 < 7 < 6 < 26 < 5 07/14/20 1385 +/- 179 < 8 < 8 < 31 < 9 07/28/20 1145 +/- 158 < 8 < 7 < 27 < 8 08/11/20 1249 +/- 207 < 9 < 6 < 30 < 13 08/25/20 1221 +/- 194 < 10 < 8 < 33 < 9 09/09/20 1292 +/- 193 < 9 < 9 < 35 < 9 09/22/20 1007 +/- 178 < 9 < 9 < 26 < 8 10/05/20 1386 +/- 163 < 5 < 6 < 25 < 6 10/21/20 1199 +/- 208 < 8 < 9 < 40 < 11 11/02/20 1159 +/- 165 < 8 < 6 < 36 < 9 11/17/20 1065 +/- 148 < 7 < 6 < 29 < 8 12/15/20 1142 +/- 145 < 7 < 6 < 31 < 9 MEAN +/- 2 STD DEV 1217 +/- 205 - - - -

C-14

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Cs-134 Cs-137 Ba-140 La-140 S 01/14/20 1225 +/- 119 < 6 < 6 < 16 < 6 02/13/20 1198 +/- 156 < 7 < 7 < 25 < 10 03/10/20 1147 +/- 149 < 7 < 6 < 26 < 7 04/07/20 1298 +/- 203 < 9 < 7 < 36 < 8 04/21/20 1168 +/- 147 < 8 < 7 < 33 < 13 05/05/20 1323 +/- 197 < 8 < 7 < 29 < 10 05/19/20 1291 +/- 147 < 7 < 6 < 31 < 11 06/02/20 1286 +/- 190 < 9 < 7 < 29 < 12 06/16/20 1169 +/- 183 < 8 < 8 < 39 < 8 06/30/20 1298 +/- 139 < 6 < 6 < 23 < 9 07/14/20 1408 +/- 196 < 11 < 9 < 40 < 13 07/28/20 1257 +/- 185 < 6 < 7 < 35 < 10 08/11/20 1113 +/- 174 < 8 < 9 < 40 < 9 08/25/20 1085 +/- 193 < 8 < 7 < 33 < 11 09/09/20 1175 +/- 152 < 9 < 9 < 35 < 11 09/22/20 1186 +/- 170 < 6 < 7 < 28 < 6 10/05/20 1198 +/- 198 < 6 < 7 < 32 < 10 10/21/20 1279 +/- 171 < 8 < 10 < 38 < 10 11/02/20 1436 +/- 208 < 10 < 9 < 41 < 10 11/17/20 1331 +/- 177 < 8 < 6 < 36 < 9 12/15/20 1272 +/- 188 < 8 < 9 < 39 < 13 MEAN +/- 2 STD DEV 1245 +/- 182 - - - -

U 01/14/20 1027 +/- 93 < 5 < 4 < 14 < 4 02/13/20 1369 +/- 165 < 8 < 7 < 33 < 9 03/10/20 1225 +/- 143 < 8 < 7 < 22 < 9 04/07/20 1130 +/- 157 < 6 < 8 < 37 < 11 04/21/20 1043 +/- 169 < 7 < 6 < 26 < 8 05/05/20 1043 +/- 161 < 8 < 8 < 29 < 8 05/19/20 885 +/- 140 < 7 < 6 < 29 < 7 06/02/20 1097 +/- 162 < 8 < 7 < 22 < 3 06/16/20 1431 +/- 182 < 8 < 8 < 36 < 10 06/30/20 955 +/- 164 < 10 < 10 < 37 < 12 07/14/20 868 +/- 151 < 10 < 8 < 39 < 11 07/28/20 1263 +/- 178 < 8 < 9 < 31 < 8 08/11/20 1014 +/- 148 < 8 < 6 < 34 < 9 08/25/20 643 +/- 146 < 8 < 8 < 37 < 13 09/09/20 1302 +/- 169 < 9 < 7 < 32 < 12 09/24/20 1101 +/- 149 < 9 < 8 < 29 < 9 10/08/20 1316 +/- 190 < 7 < 9 < 39 < 11 10/21/20 1275 +/- 199 < 9 < 8 < 33 < 11 11/02/20 1314 +/- 167 < 9 < 9 < 45 < 11 11/17/20 1165 +/- 182 < 8 < 9 < 30 < 12 12/15/20 1357 +/- 170 < 8 < 6 < 30 < 8 MEAN +/- 2 STD DEV 1134 +/- 396 - - - -

W 02/13/20 1348 +/- 171 < 8 < 7 < 32 < 8 05/05/20 1164 +/- 132 < 6 < 6 < 20 < 8 08/11/20 1371 +/- 156 < 7 < 6 < 34 < 9 11/02/20 1307 +/- 158 < 6 < 7 < 35 < 9 MEAN +/- 2 STD DEV 1298 +/- 186 - - - -

C-15

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD K-40 Cs-134 Cs-137 Ba-140 La-140 X 01/14/20 1315 +/- 103 < 4 < 4 < 13 < 3 02/13/20 1073 +/- 196 < 11 < 10 < 36 < 10 03/10/20 1093 +/- 150 < 7 < 6 < 31 < 10 04/07/20 1273 +/- 169 < 9 < 6 < 32 < 8 04/21/20 1112 +/- 139 < 7 < 7 < 28 < 10 05/05/20 1250 +/- 162 < 7 < 8 < 32 < 9 05/19/20 1180 +/- 209 < 9 < 8 < 42 < 13 06/02/20 964 +/- 138 < 6 < 7 < 24 < 10 06/16/20 1343 +/- 140 < 7 < 8 < 33 < 12 06/30/20 1134 +/- 167 < 10 < 9 < 35 < 10 07/14/20 1235 +/- 171 < 9 < 9 < 23 < 14 07/28/20 1088 +/- 175 < 8 < 7 < 29 < 6 08/11/20 1108 +/- 190 < 10 < 8 < 40 < 10 08/25/20 1174 +/- 179 < 7 < 6 < 31 < 12 09/09/20 1252 +/- 185 < 10 < 9 < 37 < 10 09/22/20 1223 +/- 152 < 7 < 8 < 27 < 7 10/05/20 1046 +/- 193 < 8 < 7 < 32 < 12 10/21/20 951 +/- 156 < 8 < 9 < 39 < 12 11/02/20 1100 +/- 157 < 9 < 7 < 38 < 11 11/17/20 1171 +/- 156 < 7 < 8 < 31 < 8 12/15/20 1127 +/- 155 < 10 < 7 < 33 < 11 MEAN +/- 2 STD DEV 1153 +/- 209 - - - -

Y 02/13/20 1337 +/- 177 < 6 < 7 < 33 < 7 05/05/20 1287 +/- 103 < 5 < 5 < 21 < 6 08/11/20 1207 +/- 154 < 7 < 7 < 25 < 9 11/03/20 1219 +/- 182 < 8 < 9 < 31 < 11 MEAN +/- 2 STD DEV 1263 +/- 122 - - - -

C-16

Table C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA COLLECTION SITE PERIOD Be-7 K-40 Mn-54 Co-58 Co-60 I-131 Cs-134 Cs-137 1C 06/17/20 Swiss Chard < 422 6117 +/- 851 < 39 < 38 < 41 < 55 < 45 < 41 06/17/20 Cabbage < 304 3829 +/- 685 < 35 < 36 < 33 < 57 < 38 < 37 06/17/20 Collards < 338 4025 +/- 657 < 31 < 37 < 36 < 55 < 35 < 35 07/23/20 Swiss Chard 629 +/- 357 4201 +/- 641 < 32 < 32 < 34 < 53 < 38 < 48 07/23/20 Cabbage < 381 3636 +/- 615 < 43 < 35 < 40 < 57 < 44 < 37 07/23/20 Corn Leaves 1625 +/- 348 2331 +/- 507 < 36 < 31 < 31 < 43 < 33 < 30 08/11/20 Swiss Chard 633 +/- 282 2331 +/- 503 < 26 < 25 < 31 < 28 < 25 < 30 08/11/20 Collards < 415 2545 +/- 595 < 32 < 37 < 35 < 54 < 32 < 44 08/11/20 Corn Leaves 2822 +/- 457 2119 +/- 541 < 32 < 28 < 21 < 37 < 34 < 38 09/16/20 Cabbage < 339 2703 +/- 626 < 33 < 32 < 36 < 36 < 31 < 39 09/16/20 Corn Leaves 3534 +/- 560 1380 +/- 601 < 42 < 27 < 36 < 54 < 50 < 37 MEAN +/- 2 STD DEV 1849 +/- 2608 3202 +/- 2642 - - - - - -

C-17 2Q 06/17/20 Broccoli Leaves 477 +/- 249 3122 +/- 530 < 20 < 22 < 25 < 43 < 28 < 25 06/17/20 Cabbage < 288 3930 +/- 628 < 28 < 26 < 30 < 43 < 28 < 31 06/17/20 Squash Leaves < 239 5008 +/- 526 < 28 < 28 < 29 < 37 < 28 < 23 07/23/20 Kale < 355 3937 +/- 675 < 32 < 33 < 31 < 39 < 38 < 32 07/23/20 Cabbage 682 +/- 221 4342 +/- 677 < 20 < 24 < 35 < 30 < 34 < 26 07/23/20 Squash Leaves 1424 +/- 350 6027 +/- 761 < 29 < 26 < 27 < 36 < 35 < 31 08/11/20 Kale 505 +/- 237 3677 +/- 545 < 32 < 30 < 31 < 36 < 36 < 33 08/11/20 Cabbage 1072 +/- 267 3469 +/- 555 < 34 < 26 < 27 < 40 < 38 < 29 08/11/20 Squash Leaves 1294 +/- 315 4038 +/- 644 < 37 < 27 < 34 < 30 < 36 < 30 09/15/20 Cauliflower < 273 3314 +/- 579 < 30 < 33 < 32 < 47 < 35 < 35 09/15/20 Broccoli < 412 3058 +/- 643 < 37 < 33 < 37 < 56 < 37 < 33 09/15/20 Brussels Sprouts < 235 4171 +/- 751 < 32 < 41 < 48 < 56 < 44 < 40 MEAN +/- 2 STD DEV 909 +/- 821 4008 +/- 1684 - - - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA COLLECTION SITE PERIOD Be-7 K-40 Mn-54 Co-58 Co-60 I-131 Cs-134 Cs-137 3Q 06/17/20 Kale < 287 5210 +/- 602 < 35 < 29 < 31 < 55 < 37 < 34 06/17/20 Cabbage < 374 3547 +/- 752 < 43 < 39 < 33 < 53 < 44 < 43 06/17/20 Collards < 290 3593 +/- 533 < 30 < 35 < 24 < 41 < 40 < 34 07/23/20 Kale < 329 6678 +/- 768 < 26 < 26 < 25 < 39 < 40 < 28 07/23/20 Broccoli Leaves < 342 4538 +/- 714 < 33 < 30 < 40 < 43 < 42 < 34 07/23/20 Collards < 500 6015 +/- 946 < 38 < 31 < 41 < 56 < 46 < 35 08/11/20 Kale < 443 4583 +/- 797 < 42 < 35 < 40 < 30 < 43 < 36 08/11/20 Collards < 359 3920 +/- 636 < 35 < 23 < 36 < 36 < 44 < 34 08/11/20 Broccoli Leaves 652 +/- 324 5267 +/- 780 < 24 < 29 < 24 < 32 < 42 < 25 09/15/20 Kale < 362 6171 +/- 720 < 38 < 35 < 39 < 54 < 42 < 39 09/15/20 Corn Leaves 1808 +/- 332 5656 +/- 621 < 30 < 30 < 37 < 52 < 30 < 31 09/15/20 Collards < 313 3478 +/- 704 < 34 < 31 < 35 < 54 < 38 < 36 MEAN +/- 2 STD DEV 1230 +/- 1635 4888 +/- 2222 - - - - - -

C-18 55 06/17/20 Collards < 299 4094 +/- 640 < 30 < 24 < 25 < 53 < 28 < 30 06/17/20 Kale < 324 4937 +/- 708 < 24 < 32 < 30 < 41 < 35 < 36 06/17/20 Swiss Chard < 285 7608 +/- 702 < 27 < 28 < 31 < 37 < 29 < 29 07/23/20 Kale < 252 2728 +/- 423 < 23 < 22 < 23 < 33 < 28 < 23 07/23/20 Cabbage 379 +/- 284 3687 +/- 553 < 22 < 23 < 26 < 33 < 33 < 24 07/23/20 Swiss Chard < 351 5183 +/- 693 < 29 < 31 < 29 < 42 < 33 < 25 08/11/20 Swiss Chard 471 +/- 255 7090 +/- 843 < 26 < 31 < 30 < 36 < 34 < 32 08/11/20 Collards 370 +/- 168 3324 +/- 556 < 25 < 22 < 28 < 26 < 31 < 24 08/11/20 Corn Leaves 1674 +/- 268 4357 +/- 572 < 27 < 22 < 21 < 26 < 27 < 25 09/16/20 Swiss Chard < 413 6095 +/- 823 < 35 < 44 < 41 < 54 < 43 < 33 09/16/20 Collards < 391 4057 +/- 835 < 35 < 45 < 28 < 51 < 39 < 35 09/16/20 Corn Leaves 1901 +/- 244 4229 +/- 430 < 17 < 19 < 19 < 28 < 23 < 22 MEAN +/- 2 STD DEV 959 +/- 1523 4782 +/- 2970 - - - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-IX.1 QUARTERLY DLR RESULTS FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 Location BQ + 2020 Normalized Net Dose, MQX Quarterly Facility Dose, FQ Monitoring Quarterly Baseline, BQ MDDQ(1) (mrem/std. qtr.) (mrem)

Location (mrem) (mrem) 1 2 3 4 1 2 3 4 P-TLD-14 23.2 28.6 24.1 24.0 25.0 22.3 ND ND ND ND P-TLD-15 23.9 29.3 24.6 24.4 25.4 23.9 ND ND ND ND P-TLD-16 23.4 28.8 21.2 22.4 23.2 22.3 ND ND ND ND P-TLD-17 27.2 32.6 29.1 27.2 28.9 28.0 ND ND ND ND P-TLD-18 23.9 29.3 24.2 24.1 26.3 22.4 ND ND ND ND P-TLD-19 20.8 26.2 20.5 19.3 20.3 18.1 ND ND ND ND P-TLD-1A 23.8 29.2 26.1 26.2 24.1 23.8 ND ND ND ND P-TLD-1B 20.2 25.6 20.3 21.0 21.4 20.5 ND ND ND ND P-TLD-1C 24.1 29.5 25.3 24.5 26.2 22.9 ND ND ND ND P-TLD-1D 23.4 28.8 24.9 21.5 23.8 20.2 ND ND ND ND P-TLD-1E 22.8 28.2 22.8 23.1 24.3 22.3 ND ND ND ND P-TLD-1F 27 32.4 26.7 28.0 27.8 26.4 ND ND ND ND P-TLD-1G 15.9 21.3 15.9 15.1 14.8 13.4 ND ND ND ND P-TLD-1H 23.6 29.0 24.1 23.8 24.6 23.5 ND ND ND ND P-TLD-1I 21.4 26.8 22.9 22.1 22.7 20.5 ND ND ND ND P-TLD-1J 27.3 32.7 29.3 27.5 27.0 24.1 ND ND ND ND P-TLD-1K 26.4 31.8 27.3 28.4 28.3 26.4 ND ND ND ND P-TLD-1L 19.4 24.8 24.4 22.9 22.7 20.9 ND ND ND ND P-TLD-1M 14 19.4 13.5 13.6 14.5 14.6 ND ND ND ND P-TLD-1NN 25.5 30.9 27.1 25.4 27.7 25.3 ND ND ND ND P-TLD-1P 16.1 21.5 18.5 16.8 17.5 14.5 ND ND ND ND P-TLD-1Q 18.7 24.1 20.6 18.3 20.3 19.1 ND ND ND ND P-TLD-1R(*) 32.9 38.3 35.6 37.6 37.9 32.6 ND ND ND ND P-TLD-1T 24.7 30.1 25.2 24.5 25.9 22.9 ND ND ND ND P-TLD-2 23 28.4 24.4 24.9 24.8 23.3 ND ND ND ND P-TLD-22 24.3 29.7 23.2 25.3 26.1 24.4 ND ND ND ND P-TLD-23 24.9 30.3 25.0 25.7 26.5 24.6 ND ND ND ND P-TLD-24 18.1 23.5 16.6 17.0 17.3 16.7 ND ND ND ND P-TLD-26 26 31.4 23.7 24.9 25.1 24.6 ND ND ND ND P-TLD-27 24.7 30.1 26.1 25.5 25.6 22.8 ND ND ND ND P-TLD-2B(**) 22.1 27.5 23.4 23.6 25.6 22.9 ND ND ND ND P-TLD-31A 19.9 25.3 19.2 20.1 20.4 19.2 ND ND ND ND P-TLD-32 25.4 30.8 25.8 25.1 26.7 25.6 ND ND ND ND P-TLD-3A 17.3 22.7 18.4 17.4 18.3 17.0 ND ND ND ND P-TLD-40 27.8 33.2 27.7 28.5 31.7 26.8 ND ND ND ND P-TLD-42 21 26.4 18.9 21.4 22.1 21.7 ND ND ND ND P-TLD-43 26.5 31.9 26.8 27.2 28.0 26.5 ND ND ND ND P-TLD-44 22.8 28.2 24.4 23.5 23.4 22.0 ND ND ND ND P-TLD-45 24.5 29.9 25.4 22.8 25.7 22.8 ND ND ND ND P-TLD-46 21 26.4 22.5 21.2 22.1 20.1 ND ND ND ND P-TLD-47 26 31.4 28.5 28.6 27.7 26.2 ND ND ND ND P-TLD-48 24.3 29.7 24.2 26.3 25 24 ND ND ND ND P-TLD-49 24 29.4 23.9 24.8 23.5 22.3 ND ND ND ND P-TLD-4K 15.1 20.5 15.4 15.3 14 15 ND ND ND ND P-TLD-5 22 27.4 22.4 22.3 23.8 21.8 ND ND ND ND P-TLD-50 28.1 33.5 28.9 28.6 27.6 26.6 ND ND ND ND P-TLD-51 23.6 29.0 25.1 24.1 25 23.8 ND ND ND ND P-TLD-6B 19.8 25.2 19.6 20.8 19.7 19.7 ND ND ND ND (1)

Minimum Differential Dose (MDDQ): The smallest amount of facility-related dose above the background dose (quarterly)

(*) 1R is the dosimeter closest to the ISFSI (**) 2B is the closest resident to the plant and ISFSI C-19

Table C-IX.2 ANNUAL DLR RESULTS FOR PEACH BOTTOM ATOMIC POWER STATION, 2020 Annual Normalized Annual Monitoring BA + MDDA(1)

Baseline, BA Annual Dose, MA Facility Dose, Location (mrem)

(mrem) (mrem/yr) FA P-TLD-14 92.8 108.9 95.4 ND P-TLD-15 95.5 111.6 98.3 ND P-TLD-16 93.7 109.8 89.1 ND P-TLD-17 108.9 125.0 113.2 ND P-TLD-18 95.5 111.6 97.0 ND P-TLD-19 83.2 99.3 78.2 ND P-TLD-1A 95 111.1 100.2 ND P-TLD-1B 80.8 96.9 83.2 ND P-TLD-1C 96.3 112.4 98.9 ND P-TLD-1D 93.8 109.9 90.4 ND P-TLD-1E 91.2 107.3 92.5 ND P-TLD-1F 108 124.1 108.9 ND P-TLD-1G 63.4 79.5 59.2 ND P-TLD-1H 94.4 110.5 96.0 ND P-TLD-1I 85.6 101.7 88.2 ND P-TLD-1J 109 125.1 107.9 ND P-TLD-1K 105.5 121.6 110.4 ND P-TLD-1L 77.6 93.7 90.9 ND P-TLD-1M 56.1 72.2 56.2 ND P-TLD-1NN 102.1 118.2 105.5 ND P-TLD-1P 64.6 80.7 67.3 ND P-TLD-1Q 74.9 91.0 78.3 ND P-TLD-1R(*) 131.7 147.8 143.7 ND P-TLD-1T 104.7 120.8 98.5 ND P-TLD-2 92.2 108.3 97.4 ND P-TLD-22 97 113.1 99.0 ND P-TLD-23 99.7 115.8 101.8 ND P-TLD-24 72.3 88.4 67.6 ND P-TLD-26 104.1 120.2 98.3 ND P-TLD-27 98.8 114.9 100.0 ND P-TLD-2B(**) 88.4 104.5 95.5 ND P-TLD-31A 79.6 95.7 78.9 ND P-TLD-32 101.7 117.8 103.2 ND P-TLD-3A 69.3 85.4 71.1 ND P-TLD-40 111.2 127.3 114.7 ND P-TLD-42 84.2 100.3 84.1 ND P-TLD-43 106.1 122.2 108.5 ND P-TLD-44 91.3 107.4 93.3 ND P-TLD-45 98.2 114.3 96.7 ND P-TLD-46 84.2 100.3 85.9 ND P-TLD-47 103.8 119.9 111 ND P-TLD-48 97.1 113.2 99.5 ND P-TLD-49 95.8 111.9 94.5 ND P-TLD-4K 60.3 76.4 59.7 ND P-TLD-5 87.8 103.9 90.3 ND P-TLD-50 112.2 128.3 111.7 ND P-TLD-51 94.5 110.6 98 ND P-TLD-6B 79.1 95.2 79.8 ND (1)

Minimum Differential Dose (MDDA): The smallest amount of facility-related dose above the background dose (annually)

(*) 1R is the dosimeter closest to the ISFSI (**) 2B is the closest resident to the plant and ISFSI C-20

FIGURE C-1 MONTHLY TOTAL GROSS BETA CONCENTRATIONS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PBAPS, 2020 16.0 CONTROL - 6I 14.0 INDICATOR - 4L INDICATOR-13B 12.0 LLD Value Investigation Level 10.0 10-yr Avg Reportable Activity C-21 10-yr Avg MDC pCi/liter 8.0 6.0 4.0 2.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MONTH Open data points are positive identification of gross beta activity

FIGURE C-2 MDC RESULTS FOR FISH SAMPLING COLLECTED IN THE VICINITY OF PBAPS, 2020 LLD for Mn-54, 15-Year Historical Average Cs-137 LLD for Cs-137 Co-58/60, Cs-134 55 and 47 pCi/kg (wet) (location 4, 6) 150 Ci/kg (wet) 130 pCi/kg (wet) 6-Bottom Feeder 6-Bottom Feeder LLD for 6-Predator Fe-59, Zn-65 260 pCi/kg (wet)

C-22 6-Predator 4-Bottom Feeder 4-Bottom Feeder 4-Predator 4-Predator 0 20 40 60 80 100 120 140 160 180 200 MDC (pCi/kg wet)

Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137

FIGURE C-3 SEMI-ANNUAL CS-137 CONCENTRATIONS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF PBAPS, 2020 No Reporting Level for Cs-137 Activity 200 Investigation Level = 1000 pCi/kg (dry) 180 160 140 120 C-23 100 pCi/kg (dry) 80 60 40 All values shown are MDC values, not reportable results 20 0

1H 2H 2020 4J (IND.) 2020 4T (IND.)

2020 6F (CON.) LLD 20-Year Historical Avg IND. 20-Year Historical Avg CON.

FIGURE C-4 MEAN WEEKLY GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF PBAPS, 2020 GROUP I (Indicator) GROUP II (Indicator)

GROUP III (Control) LLD Investigate Level 1st 10 Years of PB Operation 15 Year Average 150.0 C-24 E-3 pCi/cubic meter 5.0 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 WEEK NO.

No Required Reporting Level for Gross Beta Activities

FIGURE C-5 AVERAGE MONTHLY MDC FOR REMP MILK SAMPLES COLLECTED IN THE VICINITY OF PBAPS, 2020 Cs-134 LLD = 15 pCi/L Reporting Levels Cs-137 LLD = 18 pCi/L I-131 = 3 pCi/L Cs-134 = 60 pCi/L Cs-137 = 70 pCi/L 12 10 8

C-25 6

MDC in pCi/L 4

2 0

Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.

I-131 Control Locations I-131 Indicator Locations I-131 LLD Cs-134 Control Locations Cs-134 Indicator Locations Cs-137 Control Locations Cs-137 Indicator Locations 15-Year Avg Cs-137 MDC

C-26 mrem/year 50 70 90 110 130 150 170 P-TLD-14 P-TLD-15 P-TLD-16 P-TLD-17 P-TLD-18 P-TLD-19 P-TLD-1A P-TLD-1B P-TLD-1C P-TLD-1D P-TLD-1E P-TLD-1F P-TLD-1G P-TLD-1H P-TLD-1I FIGURE C-6 P-TLD-1J P-TLD-1K P-TLD-1L P-TLD-1M P-TLD-1NN P-TLD-1P P-TLD-1Q P-TLD-1R P-TLD-1T Normalized Annual Dose (MA)

P-TLD-2 P-TLD-22 P-TLD-23 P-TLD-24 P-TLD-26 P-TLD-27 ANNUAL NORMALIZED GAMMA RADIATION RESULTS FROM P-TLD-2B P-TLD-31A P-TLD-32 P-TLD-3A P-TLD-40 P-TLD-42 P-TLD-43 BBA+ +MDD MDDA P-TLD-44 P-TLD-45 P-TLD-46 P-TLD-47 P-TLD-48 P-TLD-49 P-TLD-4K P-TLD-5 P-TLD-50 DOSIMETERS COLLECTED IN THE VICINITY OF PBAPS, 2020 All MA data less than BA + MDDA Annual Facility Dose (FA) is reported as Non-Detectable (ND)

P-TLD-51 P-TLD-6B

APPENDIX D DATA TABLES AND FIGURES QC LABORATORIES

Intentionally left blank TABLE D-I.1 CONCENTRATIONS OF GROSS BETA IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 4L

  • Lab 12/30/19 - 01/30/20 1.6 +/- 0.7 EIS 01/27/20 - 02/26/20 0.5 +/- 0.6 EIS 02/26/20 - 04/02/20 1.2 +/- 0.6 EIS 04/02/20 - 04/30/20 2.4 +/- 0.7 EIS 04/30/20 - 05/27/20 1.9 +/- 0.7 EIS 05/27/20 - 07/01/20 1.8 +/- 0.7 EIS 07/01/20 - 07/29/20 2.4 +/- 0.7 EIS 07/29/20 - 09/02/20 3.8 +/- 0.8 EIS 09/02/20 - 10/01/20 2.8 +/- 0.7 EIS 10/01/20 - 10/29/20 2.8 +/- 0.7 EIS 10/29/20 - 12/02/20 4.0 +/- 0.8 EIS 12/02/20 - 12/29/20 2.6 +/- 0.8 EIS MEAN +/- 2 STD DEV 2.3 +/- 2.0 TABLE D-I.2 CONCENTRATIONS OF TRITIUM IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 4L Lab 12/30/19 - 04/02/20 < 151 GEL 03/30/20 - 07/01/20 < 145 GEL 06/29/20 - 10/01/20 < 184 GEL 09/28/20 - 12/29/20 < 106 GEL MEAN -

TABLE D-I.3 CONCENTRATIONS OF I-131 IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 4L Lab 12/30/19 - 01/30/20 < 0.5 EIS 01/27/20 - 02/26/20 < 0.6 EIS 02/26/20 - 04/02/20 < 0.7 EIS 04/02/20 - 04/30/20 < 0.6 EIS 04/30/20 - 05/27/20 < 0.7 EIS 05/27/20 - 07/01/20 < 0.8 EIS 07/01/20 - 07/29/20 < 0.8 EIS 07/29/20 - 09/02/20 < 0.6 EIS 09/02/20 - 10/01/20 < 0.7 EIS 10/01/20 - 10/29/20 < 0.7 EIS 10/29/20 - 12/02/20 < 0.7 EIS 12/02/20 - 12/29/20 < 0.8 EIS MEAN -

  • All detectable results were less than the required LLD THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES D-1

TABLE D-I.4 CONCENTRATIONS OF GAMMA EMITTERS IN DRINKING WATER SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA (Analysis by EIS Laboratory)

COLLECTION SITE PERIOD Mn-54 Fe-59 Co-58 Co-60 Zn-65 Zr-95 Nb-95 Cs-134 Cs-137 Ba-140 La-140 4L 01/02/20 - 01/30/20 < 4 < 9 < 4 < 5 < 9 < 7 < 4 < 5 < 4 < 16 < 7 01/30/20 - 02/26/20 < 4 < 8 < 4 < 4 < 8 < 7 < 4 < 4 < 5 < 17 < 6 02/26/20 - 04/02/20 < 6 < 14 < 5 < 6 < 9 < 8 < 6 < 5 < 6 < 25 < 9 04/02/20 - 04/30/20 < 5 < 9 < 4 < 5 < 10 < 7 < 5 < 5 < 4 < 20 < 8 04/30/20 - 05/27/20 < 4 < 8 < 4 < 4 < 8 < 7 < 5 < 4 < 4 < 20 < 7 05/27/20 - 07/01/20 < 3 < 6 < 3 < 3 < 7 < 6 < 4 < 3 < 3 < 16 < 5 07/01/20 - 07/29/20 < 4 < 7 < 4 < 3 < 8 < 7 < 4 < 4 < 4 < 16 < 6 07/29/20 - 09/02/20 < 6 < 13 < 6 < 6 < 10 < 9 < 5 < 6 < 6 < 22 < 8 09/02/20 - 10/01/20 < 4 < 8 < 4 < 4 < 8 < 7 < 4 < 4 < 4 < 18 < 6 10/01/20 - 10/29/20 < 6 < 11 < 6 < 6 < 9 < 11 < 6 < 5 < 5 < 28 < 11 10/29/21 - 12/02/20 < 6 < 14 < 6 < 5 < 14 < 7 < 6 < 6 < 7 < 27 < 9 12/02/20 - 12/29/20 < 6 < 11 < 6 < 6 < 13 < 10 < 7 < 5 < 6 < 28 < 10 D-2 MEAN - - - - - - - - - - -

TABLE D-II.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE AND I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA (Analysis by EIS Laboratory)

COLLECTION 1A 1A PERIOD GROSS BETA I-131 01/02/20 - 01/08/20 16 +/- 2 < 15 01/08/20 - 01/16/20 18 +/- 2 < 7 01/16/20 - 01/23/20 25 +/- 2 < 11 01/23/20 - 01/30/20 13 +/- 2 < 14 01/30/20 - 02/06/20 22 +/- 2 < 11 02/06/20 - 02/12/20 13 +/- 2 < 20 02/12/20 - 02/20/20 18 +/- 2 < 14 02/20/20 - 02/26/20 23 +/- 2 < 14 02/26/20 - 03/05/20 13 +/- 2 < 8 03/05/20 - 03/11/20 14 +/- 2 < 15 03/11/20 - 03/19/20 15 +/- 2 < 14 03/19/20 - 03/25/20 16 +/- 2 < 23 03/25/20 - 04/02/20 14 +/- 2 < 18 04/02/20 - 04/08/20 17 +/- 2 < 18 04/08/20 - 04/15/20 22 +/- 2 < 13 04/15/20 - 04/23/20 26 +/- 2 < 18 04/23/20 - 04/30/20 14 +/- 2 < 18 04/30/20 - 05/07/20 14 +/- 2 < 23 05/07/20 - 05/14/20 17 +/- 2 < 19 05/14/20 - 05/20/20 21 +/- 2 < 22 05/20/20 - 05/27/20 11 +/- 2 < 20 05/27/20 - 06/04/20 15 +/- 2 < 16 06/04/20 - 06/11/20 19 +/- 2 < 12 06/11/20 - 06/18/20 12 +/- 2 < 19 06/18/20 - 06/25/20 17 +/- 2 < 15 06/25/20 - 07/01/20 23 +/- 3 < 19 07/01/20 - 07/09/20 20 +/- 2 < 16 07/09/20 - 07/16/20 16 +/- 2 < 15 07/16/20 - 07/23/20 26 +/- 2 < 13 07/23/20 - 07/29/20 27 +/- 3 < 15 07/29/20 - 08/06/20 27 +/- 3 < 15 08/06/20 - 08/13/20 28 +/- 2 < 18 08/13/20 - 08/20/20 26 +/- 2 < 20 08/20/20 - 08/27/20 32 +/- 3 < 17 08/27/20 - 09/02/20 15 +/- 2 < 18 09/02/20 - 09/10/20 35 +/- 3 < 27 09/10/20 - 09/16/20 18 +/- 2 < 13 09/16/20 - 09/24/20 31 +/- 2 < 12 09/24/20 - 10/01/20 28 +/- 2 < 17 10/01/20 - 10/08/20 25 +/- 2 < 19 10/08/20 - 10/14/20 23 +/- 2 < 24 10/14/20 - 10/21/20 26 +/- 2 < 13 10/21/20 - 10/29/20 20 +/- 2 < 15 10/29/20 - 11/05/20 33 +/- 3 < 15 11/05/20 - 11/12/20 46 +/- 3 < 18 11/12/20 - 11/18/20 32 +/- 3 < 19 11/18/20 - 11/25/20 42 +/- 3 < 21 11/25/20 - 12/02/20 37 +/- 3 < 30 12/02/20 - 12/09/20 25 +/- 2 < 29 12/09/20 - 12/15/20 72 +/- 4 < 35 12/15/20 - 12/22/20 31 +/- 2 < 14 12/22/20 - 12/29/20 36 +/- 3 < 16 MEAN +/- 2 STD DEV 24 +/- 21 -

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TABLE D-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA (Analysis by EIS Laboratory)

COLLECTION SITE PERIOD Be-7 Mn-54 Co-58 Co-60 Cs-134 Cs-137 1A 01/02/20 - 04/02/20 59 +/- 12 < 2 < 2 < 1 < 1 < 1 04/02/20 - 07/01/20 74 +/- 14 < 1 < 2 < 1 < 1 < 1 07/01/20 - 10/01/20 48 +/- 13 < 2 < 2 < 2 < 2 < 2 10/01/20 - 12/29/20 67 +/- 16 < 2 < 3 < 2 < 2 < 2 MEAN +/- 2 STD DEV 62 +/- 23 - - - - -

TABLE D-III.1 CONCENTRATIONS OF I-131 AND GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA (Analysis by EIS Laboratory)

COLLECTION SITE PERIOD I-131 K-40 Cs-134 Cs-137 Ba-140 La-140 J 02/13/20 < 0.7 1380 +/- 93 < 4 < 5 < 18 < 6 05/06/20 < 0.7 1420 +/- 106 < 5 < 6 < 22 < 8 08/11/20 < 0.6 1430 +/- 107 < 4 < 5 < 18 < 5 11/02/20 < 0.6 1430 +/- 105 < 4 < 5 < 23 < 8 MEAN +/- 2 STD DEV - 1415 +/- 48 - - - -

S 02/13/20 < 0.6 1390 +/- 92 < 4 < 5 < 18 < 5 05/05/20 < 0.7 1430 +/- 107 < 4 < 5 < 25 < 9 08/11/20 < 0.6 1390 +/- 106 < 4 < 5 < 19 < 6 11/02/20 < 0.9 1500 +/- 111 < 5 < 4 < 27 < 9 MEAN +/- 2 STD DEV - 1428 +/- 104 - - - -

V 02/13/20 < 0.7 1360 +/- 93 < 5 < 5 < 17 < 7 05/05/20 < 0.6 1430 +/- 104 < 4 < 5 < 23 < 7 08/11/20 < 0.4 1430 +/- 106 < 5 < 5 < 16 < 6 11/02/20 < 0.9 1410 +/- 105 < 5 < 5 < 21 < 8 MEAN +/- 2 STD DEV - 1408 +/- 66 - - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES D-4

FIGURE D-1 COMPARISON OF MONTHLY TOTAL GROSS BETA CONCENTRATIONS IN DRINKING WATER SAMPLES FROM STATION 4L ANALYZED BY THE PRIMARY AND QC LABORATORIES, 2020 10.0 PRIMARY LAB Reporting Level 15 pCi/L QC LAB LLD 8.0 6.0 D-5 pCi/liter 4.0 2.0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MONTH Teledyne Confidential; Commercially Sensitive Business Data

FIGURE D-2 COMPARISON OF WEEKLY GROSS BETA CONCENTRATIONS FROM CO-LOCATED AIR PARTICULATE LOCATIONS (1Z/1A) ANALYZED BY THE PRIMARY AND QC LABORATORIES, 2020 QC LAB Investigation Level 160 pCi/m3 70 PRIMARY LAB LLD 60 50 D-6 40 30 E-3 pCi/cubic meter 20 10 0

1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 WEEK NO.

Teledyne Confidential; Commercially Sensitive Business Data

APPENDIX E ERRATA DATA

Intentionally left blank There was no errata data for 2020.

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Intentionally left blank APPENDIX F INTER-LABORATORY COMPARISON PROGRAM ACCEPTANCE CRITERIA AND RESULTS

Intentionally left blank A. Pre-set Acceptance Criteria

1. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of laboratory results and Analytics known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.
2. ERA Evaluation Criteria The Environmental Resource Associates evaluation report provides an acceptance range for control and warning limits with associated flag values.

The Environmental Resource Associates acceptance limits are established per the United States Environmental Protection Agency (USEPA), National Environmental Laboratory Accreditation Conference (NELAC), state-specific performance testing program requirements or ERAs standard operating procedure 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. The MAPEP defines three levels of performance: Acceptable (flag =

A), Acceptable with Warning (flag = W), and Not Acceptable (flag = N).

Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value. Performance is acceptable with warning when a mean result falls in the range from +/-20% to +/-30% of the reference value (i.e., 20% < bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

3. Laboratory-Specific Criteria Each analytical laboratory has a documentation system in place to address performance evaluation (PE) sample failures in the form of corrective actions.

The TBE Laboratory initiates a Non-Conformance Report (NCR), which details the failure, performs a root cause investigation, and proposes a corrective and/or preventative action. The GEL Laboratorys system is documented via a Corrective Action Request and Report (CARR).

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B. TBE PE Results and Discussion

1. The MAPEP February 2020 AP U-233/234 and U-238 results were evaluated as Not Acceptable. The reported value for U-233/234 was 0.0416 +/- 0.0102 Bq/sample and the known result was 0.075 Bq/sample (acceptance range 0.053 - 0.098). The reported value for U-238 was 0.0388 +/- 0.00991 Bq/sample and the known result was 0.078 Bq/sample (acceptance range 0.055 - 0.101). This sample was run as the workgroup duplicate and had RPDs of 10.4% (U-234) and 11.7% (U-238). After the known results were obtained, the sample was relogged. The filter was completely digested with tracer added originally; the R1 results were almost identical. It was concluded that the recorded tracer amount was actually double, causing the results to be skewed. Lab worksheets have been modified to verify actual tracer amount vs. LIMS data. TBE changed vendors for this cross-check to ERA MRAD during the 2nd half of 2020. Results were acceptable at 97.8% for U-234 and 106% for U-238. (NCR 20-13)
2. The Analytics September 2020 milk Sr-89 result was evaluated as Not Acceptable. The reported value was 62.8 pCi/L and the known result was 95.4 (66%). All QC data was reviewed and there were no anomalies. This was the first failure for milk Sr-89 since 2013 and there have only been 3 upper/lower boundary warnings since that time. It is believed that there may have been some Sr-89 loss during sample prep. The December 2020 result was at 92%

of the known. (NCR 20-19)

3. The ERA October 2020 water I-131 result was evaluated as Not Acceptable.

The reported value was 22.9 pCi/L and the known result was 28.2 (acceptance range 23.5 - 33.1). The reported result was 81% of the known, which passes TBE QC criteria. This was the first failure for water I-131. (NCR 20-17)

4. The ERA October 2020 water Gross Alpha and Gross Beta results were evaluated as Not Acceptable. The reported/acceptable values and ranges are as follows: Reported Known Range Gross Alpha 40.0 26.2 13.3 - 34.7 Gross Beta 47.5 69.1 48.0 - 76.0 All QC data was reviewed with no anomalies and a cause for failure could not be determined. This was the first failure for water Gross Beta. A Quick Response follow-up cross-check was analyzed as soon as possible with acceptable results at 96.8% for Gross Alpha and 102% for Gross Beta. (NCR 20-18)
5. The MAPEP August 2020 soil Ni-63 result was evaluated as Not Acceptable.

The reported value was 438 +/- 21.1 Bq/kg and the known result was 980 Bq/kg (acceptance range 686 - 1274). It is believed that some Ni-63 loss occurred during the sample prep step. (NCR 20-20)

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C. EIS Laboratory PE Results and Discussion

1. The ERA April 2020 reported Gross Beta result was 43.3 pCi/L and the known was 60.5 pCi/L (acceptance range was 41.7 - 67.2 pCi/L). Although the reported result passed the low end of the vendor acceptance criteria, but failed NRC Resolution Test Criteria. It was determined that glassware used in preparation is cleaned with nitric acid except for the volumetric pipets, which are rinsed with DI water only. The glass is potentially not as clean and could retain microdroplets of activity on the glass. Going forward, volumetric pipets are rinsed with nitric acid to remove mineral deposit and activity that might be retained on the glass during use and preventing a clean delivery of the sample.
2. The Analytics (EZA) December 2020 result for AP filter and milk Zn-65 were evaluated as failing. The reported result and known are :

Reported Known AP (Detector 2) 105 pCi 149 pCi AP (Detector 5) 111 pCi 149 pCi Milk 135 pCi/L 190 pCi/L The failure was due to an error in mapping the raw data cell to the calculated data cell in the evaluation spreadsheet. The spreadsheet was peer-reviewed and verified. The cell was mapped to the Co-60 raw data instead of the Zn-65 raw data. Had the cell been mapped correctly, the result and uncertainty would have passed NRC acceptance criteria with less than 10% difference from the true value.

D. GEL Labs PE Results and Discussion

1. Two ERA CARR 190225-1192 - ERA 1st quarter 2020 (RAD-120) water:
a. The H-3 reported value of 15,200 pCi/L were evaluated as Not Acceptable. The known result was 17,800 pCi/L with an acceptance range of 15,600 - 19,600 pCi/L. All data and lab processes were evaluated and no errors were found. It was concluded that the low bias was an isolated occurrence and that the overall process is within control.
b. Two Sr-89 results were evaluated as Not Acceptable. The reported values were 73.3 pCi/L and 70.8 pCi/L. The known result was 59.3 pCi/L, with an acceptance range of 47.6 - 67.1 pCi/L. A review of the data as well as of the preparation processes did not reveal any errors or possible contributors to the high bias. In addition, the reported values are 117% and 114% of the reference value, which is within the labs standard acceptance criteria of +/- 25% for Laboratory Control Samples.
c. The I-131 reported value of 23.7 pCi/L was evaluated as Not Acceptable. The known result was 29.9 pCi/L with an acceptance range of 24.9 - 34.9 pCi/L. The laboratory reviewed the data and F-3

found no errors. All batch QA samples including a duplicate, met acceptability criteria. The lab will continue to investigate all steps of the analytical process.

No permanent corrective actions/preventative actions or improvements were needed at this time. The lab must assume unidentified random errors caused the biases because all quality control criteria were met in the batch.

Subsequent analyses of these isotopes for drinking water were acceptable in other PT samples during the year.

2. Two ERA 2nd quarter 2020 water Sr-89 results were evaluated as Not Acceptable. The reported values were 68.8 and 71.6 pCi/L and the known result was 60.1 pCi/L (acceptance range of 48.3 - 67.9 pCi/L). No Corrective Action information was included in the 2020 QA Report.
3. CARR 200902-1287 - The ERA 3rd quarter 2020 water Co-60 result was evaluated as Not Acceptable. The reported value was 97.9 pCi/L and the known result was 86.1 pCi/L (acceptance range of 77.5 - 97.0 pCi/L). The data was reviewed and no anomalies were noted. The batch duplicate result from the original analysis met the acceptance criteria of the study and replication criteria of the lab with RPDs of <10%. Laboratory processes were evaluated and no gross errors were found. The other reported analytes for this method were within the limits of the study (except for Ba-133). A definitive contributor to the slightly high bias could not be identified, concluding that this was an isolated occurrence.

No permanent corrective actions/preventative actions or improvements were needed at this time. The lab will continue to monitor the recoveries to ensure that there are no continued process issues.

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Analytics Environmental Radioactivity Cross Check Program Table F-1 Teledyne Brown Engineering Environmental Services Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Known Result September 2020 E13247 Milk Sr-89 pCi/L 62.8 95.4 0.66 N(1)

Sr-90 pCi/L 12.0 12.8 0.94 A E13248 Milk Ce-141 pCi/L 156 150 1.04 A Co-58 pCi/L 172 180 0.96 A Co-60 pCi/L 369 379 0.97 A Cr-51 pCi/L 372 372 1.00 A Cs-134 pCi/L 171 200 0.85 A Cs-137 pCi/L 241 250 0.96 A Fe-59 pCi/L 217 200 1.08 A I-131 pCi/L 84.6 95.0 0.89 A Mn-54 pCi/L 175 180 0.97 A Zn-65 pCi/L 252 270 0.93 A E13249 Charcoal I-131 pCi 70.2 75.8 0.93 A E13250 AP Ce-141 pCi 101 101 1.00 A Co-58 pCi 111 120 0.92 A Co-60 pCi 249 254 0.98 A Cr-51 pCi 287 249 1.15 A Cs-134 pCi 114 134 0.85 A Cs-137 pCi 159 168 0.95 A Fe-59 pCi 127 134 0.95 A Mn-54 pCi 114 121 0.94 A Zn-65 pCi 168 181 0.93 A E13251 Soil Ce-141 pCi/g 0.241 0.191 1.26 W Co-58 pCi/g 0.211 0.228 0.93 A Co-60 pCi/g 0.466 0.481 0.97 A Cr-51 pCi/g 0.450 0.472 0.95 A Cs-134 pCi/g 0.273 0.254 1.07 A Cs-137 pCi/g 0.370 0.390 0.95 A Fe-59 pCi/g 0.233 0.254 0.92 A Mn-54 pCi/g 0.217 0.229 0.95 A Zn-65 pCi/g 0.368 0.343 1.07 A E13252 AP Sr-89 pCi 79.9 100.0 0.80 A Sr-90 pCi 12.1 13.4 0.90 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30 (1) See NCR 20-19 (Page 1 of 2)

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Analytics Environmental Radioactivity Cross Check Program Table F-1 Teledyne Brown Engineering Environmental Services Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Known Result December 2020 E13254 Milk Sr-89 pCi/L 82.2 89.7 0.92 A Sr-90 pCi/L 12.4 13.0 0.96 A E13255 Milk Ce-141 pCi/L 91.1 100 0.91 A Co-58 pCi/L 77.5 84.3 0.92 A Co-60 pCi/L 147 152 0.97 A Cr-51 pCi/L 259 253 1.02 A Cs-134 pCi/L 97.1 108 0.90 A Cs-137 pCi/L 117 127 0.92 A Fe-59 pCi/L 114 112 1.02 A I-131 pCi/L 84.3 91.9 0.92 A Mn-54 pCi/L 137 143 0.96 A Zn-65 pCi/L 175 190 0.92 A E13256 Charcoal I-131 pCi 70.2 78.2 0.90 A E13257A AP Ce-141 pCi 67.4 74.6 0.90 A Co-58 pCi 57.9 62.9 0.92 A Co-60 pCi 108 113 0.95 A Cr-51 pCi 162 189 0.86 A Cs-134 pCi 68.1 80.4 0.85 A Cs-137 pCi 82.4 95.0 0.87 A Fe-59 pCi 80.5 83.7 0.96 A Mn-54 pCi 102 107 0.95 A Zn-65 pCi 115 142 0.81 A E13258 Soil Ce-141 pCi/g 0.167 0.170 0.98 A Co-58 pCi/g 0.125 0.143 0.87 A Co-60 pCi/g 0.245 0.257 0.95 A Cr-51 pCi/g 0.393 0.429 0.92 A Cs-134 pCi/g 0.147 0.183 0.80 A Cs-137 pCi/g 0.260 0.288 0.90 A Fe-59 pCi/g 0.199 0.190 1.05 A Mn-54 pCi/g 0.229 0.243 0.94 A Zn-65 pCi/g 0.320 0.322 0.99 A E13259 AP Sr-89 pCi 85.0 78.6 1.08 A Sr-90 pCi 13.1 11.4 1.15 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 (Page 2 of 2)

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DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table F-2 Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Month/Year Matrix Nuclide Units Evaluation (b)

Number Value Value (a) Range February 2020 20-GrF42 AP Gross Alpha Bq/sample 0.676 1.24 0.37 - 2.11 A Gross Beta Bq/sample 2.03 2.00 1.00 - 3.00 A 20-MaS42 Soil Ni-63 Bq/kg 0.01 (1) A Sr-90 Bq/kg 348 340 238 - 442 A 20-MaW42 Water Ni-63 Bq/L 11.6 11.1 7.8 - 14.4 A Pu-238 Bq/L 0.926 0.94 0.66 - 1.22 A Pu-239/240 Bq/L 0.712 0.737 0.516 - 0.958 A 20-RdF42 AP U-234/233 Bq/sample 0.0416 0.075 0.053 - 0.098 N(3)

U-238 Bq/sample 0.0388 0.078 0.055 - 0.101 N(3) 20-RdV42 Vegetation Cs-134 Bq/sample 3.23 3.82 2.67 - 4.97 A Cs-137 Bq/sample 2.64 2.77 1.94 - 3.60 A Co-57 Bq/sample 0.0281 (1) A Co-60 Bq/sample 2.62 2.79 1.95 - 3.63 A Mn-54 Bq/sample 4.3 4.58 3.21 - 5.95 A Sr-90 Bq/sample 0.396 0.492 0.344 - 0.640 A Zn-65 Bq/sample 3.93 3.79 2.65 - 4.93 A August 2020 20-GrF43 AP Gross Alpha Bq/sample 0.267 0.528 0.158 - 0.898 A Gross Beta Bq/sample 0.939 0.915 0.458 - 1.373 A 20-MaS43 Soil Ni-63 Bq/kg 438 980 686 - 1274 N(4)

Tc-99 Bq/kg 1.11 (1) A 20-MaW43 Water Ni-63 Bq/L 0.175 (1) A Tc-99 Bq/L 8.8 9.4 6.6 - 12.2 A 20-RdV43 Vegetation Cs-134 Bq/sample 3.635 4.94 3.46 - 6.42 W Cs-137 Bq/sample 0.0341 (1) A Co-57 Bq/sample 5.855 6.67 4.67 - 8.67 W Co-60 Bq/sample 3.122 4.13 2.89 - 5.37 W Mn-54 Bq/sample 4.524 5.84 4.09 - 7.59 A Sr-90 Bq/sample 1.01 1.39 0.97 - 1.81 W Zn-65 Bq/sample 4.706 6.38 4.47 - 8.29 W (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) 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 NCR 20-13 (4) See NCR 20-20 (Page 1 of 1)

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ERA Environmental Radioactivity Cross Check Program Table F-3 Teledyne Brown Engineering Environmental Services Identification Known Acceptance Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Limits March 2020 MRAD-32 Water Am-241 pCi/L 52.5 45.3 31.1 - 57.9 A Fe-55 pCi/L 155 152 89.3 - 221 A Pu-238 pCi/L 34.0 36.4 21.9 - 47.2 A Pu-239 pCi/L 30.9 33.6 20.8 - 41.4 A April 2020 RAD-121 Water Ba-133 pCi/L 41.8 41.8 34.0- 46.7 A Cs-134 pCi/L 42.9 46.3 37.1 - 50.9 A Cs-137 pCi/L 226 234 211 - 259 A Co-60 pCi/L 52.4 50.3 45.3 - 57.9 A Zn-65 pCi/L 83.3 86.8 78.1 - 104 A GR-A pCi/L 20.1 23.6 11.9 - 31.6 A GR-B pCi/L 45.6 60.5 41.7 - 67.2 A U-Nat pCi/L 18.45 18.6 14.9 - 20.9 A H-3 pCi/L 14200 14100 12300 - 15500 A Sr-89 pCi/L 58.0 60.1 48.3 - 67.9 A Sr-90 pCi/L 34.1 44.7 33.0 - 51.2 A I-131 pCi/L 27.4 28.9 24.1 - 33.8 A September 2020 MRAD-33 Soil Sr-90 pCi/Kg 4360 4980 1550 - 7760 A AP Fe-55 pCi/Filter 189 407 149 - 649 A U-234 pCi/Filter 17.9 18.3 13.6 - 21.4 A U-238 pCi/Filter 19.1 18.1 13.7 - 21.6 A Water Am-241 pCi/L 160 176 121 - 225 A Fe-55 pCi/L 299 298 175 - 433 A Pu-238 pCi/L 200 191 115 - 247 A Pu-239 pCi/L 105 100 61.9 - 123 A October 2020 RAD-123 Water Ba-133 pCi/L 37.1 37.0 29.8 - 41.6 A Cs-134 pCi/L 50.6 52.7 42.5 - 58.0 A Cs-137 pCi/L 131 131 118 - 146 A Co-60 pCi/L 62.9 60.5 54.4 - 69.1 A Zn-65 pCi/L 167 162 146 - 191 A GR-A pCi/L 40.0 26.2 13.3 - 34.7 N(1)

GR-B pCi/L 47.5 69.1 48.0 - 76.0 N(1)

U-Nat pCi/L 17.2 20.3 16.3 - 22.7 A H-3 pCi/L 23800 23200 20,300 - 25,500 A Sr-89 pCi/L 41.1 43.3 33.4 - 50.5 A Sr-90 pCi/L 28.5 30.2 22.0 - 35.0 A I-131 pCi/L 22.9 28.2 23.5 - 33.1 N(2)

November 2020 QR111920K Water GR-A pCi/L 50.7 52.4 27.3 - 65.6 A GR-B pCi/L 24.9 24.3 15.0 - 32.3 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 20-18 (2) See NCR 20-17 (Page 1 of 1)

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TABLE F-4 Analytics Environmental Radioactivity Cross Check Program Exelon Industrial Services (2020)

EIS Identification Known Ratio of Analytics Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) to EIS Result Value June 2020 E13065 AP Ce-141 pCi/Filter 71.5 75.5 95 Pass Detector 2 Co-58 pCi/Filter 60.7 65.4 93 Pass Co-60 pCi/Filter 125 127 98 Pass Cr-51 pCi/Filter 115 167 69 Pass Cs-134 pCi/Filter 82.9 95.2 87 Pass Cs-137 pCi/Filter 64.0 67.5 95 Pass Fe-59 pCi/Filter 65.8 65.7 100 Pass Mn-54 pCi/Filter 87.3 87.0 100 Pass Zn-65 pCi/Filter 136 146 93 Pass E13065 AP Ce-141 pCi/Filter 68.0 75.5 90 Pass Detector 3 Co-58 pCi/Filter 67.3 65.4 103 Pass Co-60 pCi/Filter 125 127 99 Pass Cr-51 pCi/Filter 135 167 81 Pass Cs-134 pCi/Filter 83.9 95.2 88 Pass Cs-137 pCi/Filter 70.9 67.5 105 Pass Fe-59 pCi/Filter 72.4 65.7 110 Pass Mn-54 pCi/Filter 91.8 87.0 106 Pass Zn-65 pCi/Filter 154 146 106 Pass E13065 AP Ce-141 pCi/Filter 82.8 75.5 110 Pass Detector 4 Co-58 pCi/Filter 55.0 65.4 84 Pass Co-60 pCi/Filter 124 127 98 Pass Cr-51 pCi/Filter 159 167 95 Pass Cs-134 pCi/Filter 75.8 95.2 80 Pass Cs-137 pCi/Filter 64.2 67.5 95 Pass Fe-59 pCi/Filter 82.9 65.7 126 Pass Mn-54 pCi/Filter 88.3 87.0 102 Pass Zn-65 pCi/Filter 153 146 105 Pass E13065 AP Ce-141 pCi/Filter 79.4 75.5 105 Pass Detector 5 Co-58 pCi/Filter 62.1 65.4 95 Pass Co-60 pCi/Filter 136 127 107 Pass Cr-51 pCi/Filter 179 167 107 Pass Cs-134 pCi/Filter 81.4 95.2 86 Pass Cs-137 pCi/Filter 71.8 67.5 106 Pass Fe-59 pCi/Filter 71.7 65.7 109 Pass Mn-54 pCi/Filter 94.1 87.0 108 Pass Zn-65 pCi/Filter 152 146 104 Pass June 2020 E13062 AP I-131 pCi/Filter 82.5 91.7 90 Pass Detectors I-131 pCi/Filter 87.6 91.7 96 Pass 2,3,4,5 I-131 pCi/Filter 88.1 91.7 96 Pass I-131 pCi/Filter 86.2 91.7 94 Pass E13063 Water Gr-B pCi/L 273 272 100 Pass E13060 Milk I-131 pCi/L 80.8 81.5 99 Pass Detector 2 Ce-141 pCi/L 107 116 92 Pass Co-58 pCi/L 107 100 107 Pass Co-60 pCi/L 200 195 103 Pass Cr-51 pCi/L 223 256 87 Pass Cs-134 pCi/L 142 146 97 Pass Cs-137 pCi/L 97.9 104 94 Pass Fe-59 pCi/L 96.0 101 95 Pass Mn-54 pCi/L 154 134 115 Pass Zn-65 pCi/L 225 225 100 Pass (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 EIS internal QC limits in accordance with the NRC Resolution Test criteria F-5 (Page 1 of 3)

TABLE F-4 Analytics Environmental Radioactivity Cross Check Program Exelon Industrial Services (2020)

EIS Identification Known Ratio of Analytics Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) to EIS Result Value E13060 Milk I-131 pCi/L 81.2 81.5 100 Pass Detector 3 Ce-141 pCi/L 106 116 91 Pass Co-58 pCi/L 101 100 101 Pass Co-60 pCi/L 195 195 100 Pass Cr-51 pCi/L 250 256 98 Pass Cs-134 pCi/L 131 146 90 Pass Cs-137 pCi/L 102 104 98 Pass Fe-59 pCi/L 99.1 101 98 Pass Mn-54 pCi/L 133 134 99 Pass Zn-65 pCi/L 189 225 84 Pass E13060 Milk I-131 pCi/L 71.4 81.5 88 Pass Detector 4 Ce-141 pCi/L 114 116 98 Pass Co-58 pCi/L 99.2 100 99 Pass Co-60 pCi/L 199 195 102 Pass Cr-51 pCi/L 251 256 98 Pass Cs-134 pCi/L 125 146 86 Pass Cs-137 pCi/L 98.9 104 95 Pass Fe-59 pCi/L 104 101 103 Pass Mn-54 pCi/L 124 134 92 Pass Zn-65 pCi/L 211 225 94 Pass E13060 Milk I-131 pCi/L 87.3 81.5 107 Pass Detector 5 Ce-141 pCi/L 118 116 102 Pass Co-58 pCi/L 94.9 100 95 Pass Co-60 pCi/L 181 195 93 Pass Cr-51 pCi/L 231 256 90 Pass Cs-134 pCi/L 128 146 88 Pass Cs-137 pCi/L 101 104 97 Pass Fe-59 pCi/L 106 101 105 Pass Mn-54 pCi/L 130 134 97 Pass Zn-65 pCi/L 200 225 89 Pass E13064 Water I-131 pCi/L 63.9 80.5 79 Pass Detector 2 Ce-141 pCi/L 116 117 99 Pass Co-58 pCi/L 91.4 102 90 Pass Co-60 pCi/L 201 198 101 Pass Cr-51 pCi/L 208 259 80 Pass Cs-134 pCi/L 150 148 101 Pass Cs-137 pCi/L 109 105 104 Pass Fe-59 pCi/L 116 102 114 Pass Mn-54 pCi/L 129 135 95 Pass Zn-65 pCi/L 218 227 96 Pass E13064 Water I-131 pCi/L 67.4 80.5 84 Pass Detector 4 Ce-141 pCi/L 126 117 107 Pass Co-58 pCi/L 100 102 98 Pass Co-60 pCi/L 204 198 103 Pass Cr-51 pCi/L 216 259 83 Pass Cs-134 pCi/L 150 148 102 Pass Cs-137 pCi/L 106 105 101 Pass Fe-59 pCi/L 119 102 116 Pass Mn-54 pCi/L 159 135 117 Pass Zn-65 pCi/L 211 227 93 Pass (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 EIS internal QC limits in accordance with the NRC Resolution Test criteria F-6 (Page 2 of 3)

TABLE F-4 Analytics Environmental Radioactivity Cross Check Program Exelon Industrial Services (2020)

EIS Identification Known Ratio of Analytics Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) to EIS Result Value E13064 Water I-131 pCi/L 90.2 80.5 112 Pass Ce-141 pCi/L 119 117 102 Pass Co-58 pCi/L 110 102 108 Pass Co-60 pCi/L 188 198 95 Pass Cr-51 pCi/L 229 259 89 Pass Cs-134 pCi/L 141 148 95 Pass Cs-137 pCi/L 105 105 100 Pass Fe-59 pCi/L 106 102 104 Pass Mn-54 pCi/L 150 135 111 Pass Zn-65 pCi/L 221 227 97 Pass September 2020 E13066 AP Gr-B pCi 174 162 107 Pass Gr-B pCi 175 162 108 Pass December 2020 E13067 AP Ce-141 pCi/Filter 77.1 78.4 98.3 Pass Detector 2 Co-58 pCi/Filter 64.3 66.1 97.2 Pass Co-60 pCi/Filter 117 119 98.3 Pass Cr-51 pCi/Filter 184 199 92.3 Pass Cs-134 pCi/Filter 79.3 84.5 93.8 Pass Cs-137 pCi/Filter 92.3 99.9 92.4 Pass Fe-59 pCi/Filter 101 87.9 115 Pass Mn-54 pCi/Filter 109 112 97.5 Pass Zn-65 pCi/Filter 105 149 70.6 Fail(1)

December 2020 E13067 AP Ce-141 pCi/Filter 83.9 78.4 107 Pass Detector 5 Co-58 pCi/Filter 63.0 66.1 95.3 Pass Co-60 pCi/Filter 124 119 104 Pass Cr-51 pCi/Filter 197 199 98.9 Pass Cs-134 pCi/Filter 72.2 85 85.5 Pass Cs-137 pCi/Filter 95.0 99.9 95.1 Pass Fe-59 pCi/Filter 111 87.9 126 Pass Mn-54 pCi/Filter 125 112 112 Pass Zn-65 pCi/Filter 111 149 74.7 Fail(1)

December 2020 E13068 Water Gr-B pCi/L 300 277 108 Pass E13070 Cartridge I-131 pCi 73.4 78.3 93.7 Pass Detector 2, 5 pCi 79.4 78.3 101 Pass E13070 Milk I-131 pCi/L 83.3 91.9 90.6 Pass Ce-141 pCi/L 106 100 106 Pass Co-58 pCi/L 72.7 84.3 86.3 Pass Co-60 pCi/L 150 152 98.8 Pass Cr-51 pCi/L 231 253 91.4 Pass Cs-134 pCi/L 89.6 108 83.0 Pass Cs-137 pCi/L 120 127 94.6 Pass Fe-59 pCi/L 116 112 103 Pass Mn-54 pCi/L 146 143 102 Pass Zn-65 pCi/L 135 190 71.2 Fail(1)

(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 EIS internal QC limits in accordance with the NRC Resolution Test criteria (1) Failures caused by clerical error in calculation spreadsheet F-7 (Page 3 of 3)

TABLE F-5 ERA Environmental Radioactivity Cross Check Program Exelon Industrial Services (2020)

EIS Acceptance Known Month/Year ID Number Matrix Nuclide Units Reported Ratio of ERA Evaluation (b)

Value (a)

Value to EIS Result April 2020 RAD-121 Water Ba-133 pCi/L 40.1 41.8 96 Pass Cs-134 pCi/L 46.5 46.3 100 Pass Cs-137 pCi/L 225 234 96 Pass Co-60 pCi/L 50.7 50.3 101 Pass Zn-65 pCi/L 87.8 86.8 101 Pass I-131 pCi/L 29.7 28.9 103 Pass GR-B pCi/L 43.3 60.5 72 Fail(2)

September 2020 MRAD-33 AP Am-241 pCi/Filter 26.1 22.2 118 Pass Cs-134 pCi/Filter 270 296 91 Pass Cs-137 pCi/Filter 439 413 106 Pass Co-60 pCi/Filter 528 497 106 Pass Zn-65 pCi/Filter 528 500 106 Pass October 2020 RAD-123 Water Ba-133 pCi/L 33.3 37.0 90 Pass Detector 2 Cs-134 pCi/L 53.7 52.7 102 Pass Cs-137 pCi/L 136 131 104 Pass Co-60 pCi/L 68.8 60.6 114 Pass Zn-65 pCi/L 150 162 93 Pass I-131 pCi/L 27.5 28.2 97 Pass (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 based on EIS internal QC limits in accordance with the NRC Resolution Test criteria (2) Passed vendor acceptance criteria, but failed NRC Resolution Test criteria F-8 (Page 1 of 1)

TABLE F-6 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

GEL Laboratories (Gamma, Gross Alpha/Beta, H-3 & Sr-90)

Identification Reported Known Quarter/Year Matrix Nuclide Units Acceptance Range Evaluation (b)

Number Value Value (a) 2nd/2020 20-GrW42 Water Gr-A Bq/L 1.01 1.03 0.31 - 1.75 A Gr-B Bq/L 4.18 4.24 2.12- 6.36 A 20-MaW42 Water H-3 Bq/L 193 196 137 - 255 A Sr-90 Bq/L 0.0122 False Positive Test A Cs-134 Bq/L 17 18.5 13.0 - 24.1 A Cs-137 Bq/L 12 11.3 7.9 - 14.7 A Co-60 Bq/L 11 10.6 7.4 - 13.8 A Fe-55 Bq/L 18.2 17.8 12.5 - 23.1 A K-40 Bq/L -0.0485 False Positive Test A Mn-54 Bq/L 20.6 19.6 13.7 - 25.5 A Zn-65 Bq/L 23.9 22.2 15.5 - 28.9 A 4th/2020 20-MaW43 Water H-3 Bq/L 330 360 252 - 468 A Sr-90 Bq/L 9.97 11.6 8.1 - 15.1 A Cs-134 Bq/L 13.9 15.2 10.6 - 19.8 A Cs-137 Bq/L 15.1 14.3 10.0 - 18.6 A Co-60 Bq/L 12.9 12.2 8.5 - 15.9 A Fe-55 Bq/L 29.2 32.9 23.0 - 42.8 A K-40 Bq/L -0.763 False Positive Test A Mn-54 Bq/L -0.0032 False Positive Test A Zn-65 Bq/L 18.9 16.9 11.8 - 22 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) 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 F-9 (Page 1 of 1)

TABLE F-7 ERA Environmental Radioactivity Cross Check Program GEL Laboratories (Gamma, Gross Alpha/Beta, H-3 & Sr-89/90)

Identification Reported Known Acceptance Quarter/Year Matrix Nuclide Units Evaluation (b)

Number Value Value (a) Limits 1st/2020 RAD-120 Water Cs-134 pCi/L 21.5 22.9 17.5 - 25.6 A Cs-137 pCi/L 217 220 198 - 244 A Co-60 pCi/L 97.7 91.2 82.1 - 103 A I-131 pCi/L 23.7 29.9 24.9 - 34.9 N(1)

I-131 pCi/L 31.8 29.9 24.9 - 34.9 A Zn-65 pCi/L 332 298 268 - 348 A Gr-A pCi/L 67.1 58.9 30.8 - 73.3 A Gr-A pCi/L 55.4 58.9 30.8 - 73.3 A Gr-B pCi/L 20.0 21.0 12.6 - 29.1 A H-3 pCi/L 15,200 17,800 15,600 - 19,600 N(1)

H-3 pCi/L 17,700 17,800 15,600 - 19,600 A Sr-89 pCi/L 73.3 59.3 47.6 - 67.1 N(1)

Sr-89 pCi/L 70.8 59.3 47.6 - 67.1 N(1)

Sr-90 pCi/L 38.3 36.5 26.8 - 42.1 A Sr-90 pCi/L 30.6 36.5 26.8 - 42.1 A 2nd/2020 MRAD-32 Water Cs-134 pCi/L 1,420 1,520 1,150 - 1,670 A Cs-137 pCi/L 2,440 2,390 2,050 - 2,720 A Co-60 pCi/L 2,890 2,760 2,380 - 3,170 A Fe-55 pCi/L 140 152 89.3 - 221 A Mn-54 pCi/L <6.25 <100 <100 A Zn-65 pCi/L 1,330 1,190 1,060 - 1,500 A Sr-90 pCi/L 426 447 322 - 552 A Gr-A pCi/L 67.6 165 60.2 - 228 A Gr-B pCi/L 143 158 79.0 - 217 A H-3 pCi/L 5,990 6,280 4,730 - 7,640 A RAD-121 Water I-131 pCi/L 27.5 28.9 24.1 - 33.8 A Sr-89 pCi/L 68.8 60.1 48.3 - 67.9 N(2)

Sr-89 pCi/L 71.6 60.1 48.3 - 67.9 N(2)

H-3 pCi/L 13,100 14,100 12,300 - 15,500 A 3rd/2020 RAD-122 Water Cs-134 pCi/L 23.0 22.3 17.0 - 25.0 A Cs-137 pCi/L 76.5 73.0 65.7 - 83.0 A Co-60 pCi/L 97.9 86.1 77.5 - 97.0 N(3)

I-131 pCi/L 29.9 26.1 21.7 - 30.8 A Zn-65 pCi/L 96.3 82.9 74.6 - 99.6 A Gr-A pCi/L 54.3 52.4 27.3 - 65.6 A Gr-B pCi/L 24.7 24.3 15.0 - 32.3 A H-3 pCi/L 17,800 20,300 17,800 - 22,300 A H-3 pCi/L 20,200 20,300 17,800 - 22,300 A Sr-89 pCi/L 61.7 68.9 56.2 - 77.1 A Sr-90 pCi/L 18.2 19.5 13.9 - 23.1 A 4th/2020 MRAD-31 Water Cs-134 pCi/L 849 911 688 - 1,000 A Cs-137 pCi/L 1,540 1,510 1,290 - 1,720 A Co-60 pCi/L 1,660 1,560 1,350 - 1,790 A Fe-55 pCi/L 267 298 175 - 433 A Mn-54 pCi/L <4.61 <100 <100 A Zn-65 pCi/L 1,010 917 816 - 1,160 A Sr-90 pCi/L 917 787 567 - 973 A Gr-A pCi/L 100 111 40.5 - 153 A Gr-B pCi/L 181 194 97.0 - 267 A H-3 pCi/L 11,600 12,000 9,040 - 14,600 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) CARR200224-1274 (2) No Information (3) CARR200902-1287 F-10 (Page 1 of 1)

TABLE F-8 Analytics Environmental Radioactivity Cross Check Program GEL Laboratories (Gamma only)

Identification Reported Known Acceptance Quarter/Year Matrix Nuclide Units Evaluation (b)

Number Value Value (a) Limits 1st/2020 E13170 Water Cs-134 pCi/L 153 154 0.99 A Cs-137 pCi/L 208 185 1.12 A Co-58 pCi/L 221 196 1.13 A Co-60 pCi/L 259 236 1.10 A Fe-59 pCi/L 179 168 1.06 A I-131 pCi/L 102 93 1.10 A Mn-54 pCi/L 248 216 1.15 A Zn-65 pCi/L 305 261 1.17 A 2nd/2020 E13174 Water Cs-134 pCi/L 136 148 0.92 A Cs-137 pCi/L 104 105 0.99 A Co-58 pCi/L 105 102 1.03 A Co-60 pCi/L 205 198 1.04 A Fe-59 pCi/L 91 81 1.13 A I-131 pCi/L 105 102 1.03 A Mn-54 pCi/L 147 135 1.09 A Zn-65 pCi/L 249 227 1.10 A 3rd/2020 E13178 Water Cs-134 pCi/L 181 201 0.90 A Cs-137 pCi/L 263 251 1.05 A Co-58 pCi/L 190 180 1.05 A Co-60 pCi/L 404 380 1.06 A Fe-59 pCi/L 226 201 1.12 A I-131 pCi/L 98 98 1.00 A Mn-54 pCi/L 206 181 1.14 A Zn-65 pCi/L 302 271 1.12 A 4th/2020 E13182 Water Cs-134 pCi/L 114 114 1.00 A Cs-137 pCi/L 137 135 1.02 A Co-58 pCi/L 95.4 89.2 1.07 A Co-60 pCi/L 174 161 1.08 A Fe-59 pCi/L 137 119 1.16 A I-131 pCi/L 97 96 1.02 A Mn-54 pCi/L 165 151 1.09 A Zn-65 pCi/L 229 201 1.14 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 laboratory's internal acceptance criteria of 75% - 125%:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits F-11 (Page 1 of 1)

Intentionally left blank APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Docket No: 50-277 50-278 PEACH BOTTOM ATOMIC POWER STATION UNITS 2 and 3 Annual Radiological Groundwater Protection Program Report (ARGPPR)

January 1 through December 31, 2020 Prepared By Teledyne Brown Engineering Environmental Services Peach Bottom Atomic Power Station Delta, PA 17314 May 2021

Table of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction...................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ........................................................................ 3 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium ..................................................................................... 4 III. Program Description....................................................................................................... 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation ............................................................................................... 5 C. Background Analysis ........................................................................................... 6

1. Background Concentrations of Tritium...................................................... 6 IV. Results and Discussion ................................................................................................. 8 A. Groundwater Results ........................................................................................... 8 B. Surface Water Results ......................................................................................... 9 C. Precipitation Water Results ................................................................................. 9 D. Drinking Water Well Survey................................................................................. 9 E. Summary of Results - Inter-laboratory Comparison Program........................... 10 F. Leaks, Spills and Releases ................................................................................ 10 G. Trends ............................................................................................................... 10 H. Investigations..................................................................................................... 10 I. Actions Taken ..................................................................................................... 12 J. Deviations........................................................................................................... 12 V. References ................................................................................................................... 12 i

Appendices Appendix A Sampling Locations, Distance and Direction Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Peach Bottom Atomic Power Station, 2020 Figures Figure A-1 Well Water Locations, Peach Bottom Atomic Power Station, 2020 Figure A-2 RGPP Monitoring Locations, Peach Bottom Atomic Power Station, 2020 Figure A-3 RGPP Precipitation Monitoring Locations, Peach Bottom Atomic Power Station, 2020 Appendix B Data Tables Tables Table B-I.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater and Seep Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 Table B-I.2 Concentrations of Gamma Emitters in Groundwater and Seep Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 Table B-I.3 Concentrations of Hard-to-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 Table B-II.1 Concentrations of Tritium in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 Table B-II.2 Concentrations of Gamma Emitters in Surface Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 Table B-III.1 Concentrations of Tritium in Precipitation Water Samples Collected as Part of the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2020 ii

I. Summary and Conclusions This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Peach Bottom Atomic Power Station (PBAPS) by Exelon Nuclear covers the period 01 January 2020 through 31 December 2020. This evaluation involved numerous station personnel and contractor support personnel. At PBAPS, there are 31 permanent groundwater monitoring wells.

Installation of the wells began in 2006. Of these monitoring locations, none are assigned to the stations Radiological Environmental Monitoring Program (REMP).

This report covers groundwater, surface water, seep water, and precipitation water samples collected from the environment on station property in 2020. During that time period, 312 analyses were performed on 185 samples from 46 locations.

These 46 locations include 24 groundwater monitoring wells, 3 surface water sample points, 3 groundwater seeps, 2 yard drain sumps, and 14 precipitation water sampling points. Phase 1 of the monitoring was part of a comprehensive study initiated by Exelon to determine whether groundwater or surface water in the vicinity of PBAPS had been adversely impacted by any releases of radionuclides. Phase 1 was conducted by Conestoga Rovers and Associates (CRA) and the conclusions were made available to state and federal regulators as well as the public. Phase 2 of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater and surface water locations selected during Phase 1. All analytical results from Phase 2 monitoring are reported herein.

Samples supporting the RGPP were analyzed for tritium (H-3), strontium-89 (Sr-89), strontium-90 (Sr-90), gross alpha, gross beta, gamma-emitting radionuclides associated with licensed plant operations and isotopes known as hard to detects.

In assessing all the data gathered for this report, it was concluded that the operation of PBAPS had no adverse radiological impact on the environment and there are currently no known active releases into the groundwater at PBAPS.

Tritium was not detected in any groundwater sample greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission [NRC] Reporting Limit) of 20,000 pCi/L.

Tritium was not detected at concentrations greater than the minimum detectable concentration (MDC) in any surface water or seep water sample locations. Based on the sample data, tritium is not migrating off the station property at detectable concentrations. Tritium was detected in 2 precipitation water sample locations but below the 20,000 pCi/L limit.

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II. Introduction PBAPS is located along the Susquehanna River between Holtwood and Conowingo Dams in Peach Bottom Township, York County, Pennsylvania. The initial loading of fuel into Unit 1, a 40 MWe (net) high temperature gas-cooled reactor, began on 5 February 1966, and initial criticality was achieved on 3 March 1966. Shutdown of Peach Bottom Unit 1 for decommissioning was on 31 October 1974. For the purposes of the monitoring program, the beginning of the operational period for Unit 1 was considered to be 5 February 1966. A summary of the Unit 1 preoperational monitoring program was presented in a previous report (1). PBAPS Units 2 and 3 are boiling water reactors, each with a power output of approximately 1385 MWe.

The first fuel was loaded into Peach Bottom Unit 2 on 9 August 1973. Criticality was achieved on 16 September 1973 and full power was reached on 16 June 1974. The first fuel was loaded into Peach Bottom Unit 3 on 5 July 1974. Criticality was achieved on 7 August 1974 and full power was first reached on 21 December 1974.

Preoperational summary reports (2)(3) for Units 2 and 3 have been previously issued and summarize the results of all analyses performed on samples collected from 5 February 1966 through 8 August 1973.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2020.

A. Objective of the RGPP The objectives of the RGPP are as follows:

1. Ensure that the site characterization of geology and hydrology provides an understanding of predominant groundwater gradients based upon current site conditions.
2. Identify site risk based on plant design and work practices.
3. Establish an on-site groundwater monitoring program to ensure timely detection of inadvertent radiological releases to ground water.
4. Establish a remediation protocol to prevent migration of licensed material off-site and to minimize decommissioning impacts.
5. Ensure that records of leaks, spills, remediation efforts are retained and retrievable to meet the requirements of 10 CFR 50.75(g).
6. Conduct initial and periodic briefings of their site specific Groundwater Protection Initiative (GPI) program with the designated State/Local officials.
7. Make informal communication as soon as practicable to appropriate State/Local officials, with follow-up notifications to the NRC, as appropriate, regarding significant on-site leaks/spills into groundwater and on-site or off-site water sample results exceeding the criteria in the REMP as described in the Offsite Dose Calculation Manual (ODCM).

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8. Submit a written 30-day report to the NRC for any water sample result for on-site groundwater that is or may be used as a source of drinking water that exceeds any of the criteria in the licensees existing REMP/ODCM for 30-day reporting of off-site water sample results.
9. Document all on-site groundwater sample results and a description of any significant on-site leaks/spills into groundwater for each calendar year in the Annual Radiological Environmental Operating Report (AREOR) for REMP or the Annual Radioactive Effluent Release Report (ARERR).
10. Perform a self-assessment of the GPI program.
11. Conduct a review of the GPI program, including at a minimum the licensee's self-assessments, under the auspices of the Nuclear Energy Institute (NEI).

B. Implementation of the Objectives The objectives identified have been implemented at PBAPS via Exelon Corporate and Site specific procedures. These procedures include:

1. EN-AA-407, Response to Inadvertent Releases of Licensed Materials to Groundwater, Surface Water, Soil or Engineered Structures
2. EN-AA-408, Radiological Groundwater Protection Program
3. EN-AA-408-4000, Radiological Groundwater Protection Program Implementation
4. EN-PB-408-4160, RGPP Reference Material for Peach Bottom Atomic Power Station C. Program Description
1. Sample Collection Sample locations can be found in Table A-1 and Figures A-1, A-2 and A-3, Appendix A.

Groundwater, Surface Water and Precipitation Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management and shipment of samples, as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received.

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Analytical data results are reviewed by both station personnel and an independent hydro geologist for adverse trends or changes to hydrogeologic conditions.

D. Characteristics of Tritium Tritium is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food or absorption through skin. Once tritium enters the body it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors, where the isotopes lithium-7 (Li-7) and/or boron-10 (B-

10) are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (He-3). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium emits a low energy beta particle and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.

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III. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE, Exelon Industrial Services (EIS) and GEL Laboratories (GEL) to analyze the environmental samples for radioactivity for the PBAPS RGPP in 2020.

In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater and surface water.
2. Concentrations of strontium in groundwater.
3. Concentrations of tritium in groundwater, surface water and precipitation water.
4. Concentrations of 'hard-to-detect' isotopes, americium-241 (Am-241), cerium-242/243/244 (Cm-242, Cm-243, Cm-244),

plutonium-238/239/240 (Pu-238, Pu-239, Pu-240), uranium-233/234/235/238 (U-233, U-234, U-235, U-238), iron-55 (Fe-55), and nickel-63 (Ni-63) in groundwater. These analyses are required based on tritium results.

B. Data Interpretation The radiological data collected prior to PBAPS becoming operational were used as a baseline for operational data comparison. For the purpose of this report, PBAPS was considered operational at initial criticality. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection The lower limit of detection (LLD) is a minimum sensitivity value that must be achieved routinely by the analytical parameter.
2. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from factors such as calibration standards, sample volume or weight measurements, and sampling uncertainty. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus (+/-) the estimated sample standard deviation.

Analytical uncertainties are reported at the 95% confidence level in this 5

report for reporting consistency with the AREOR.

Gamma spectroscopy results for each type of sample were grouped as follows:

For groundwater and surface water 12 nuclides, Mn-54, Co-58, Co-60, Fe-59, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140 and La-140 were measured.

C. Background Analysis A pre-operational REMP was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life and foodstuffs. The results of the monitoring were detailed in References 2 and 3. The pre-operational REMP contained analytical results from samples collected from the surface water, discharge, well water and rainwater.

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others.

Additional detail may be found by consulting references (CRA 2006)(1).

a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, Cosmogenic tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle.

Below ground, lithogenic tritium is produced by the bombardment of natural Li present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant U and Th. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of Li in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and Sr-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

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b. Precipitation Data Precipitation monitoring was done at PBAPS until 2006. These types of samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide from 1960 to 2006. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline until 1975. A gradual decline has followed since that time. Tritium concentrations have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.
c. Surface Water Data Surface water level measurements were collected at the surface water monitoring locations during the groundwater level measurement event. The purpose of the surface water monitoring was to provide surface water elevation data to evaluate the groundwater/surface water interaction at the Station.

The USEPA RadNet surface water data typically has a reported Combined Standard Uncertainty of 35 to 50 pCi/L. According to USEPA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement. Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon-specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

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IV. Results and Discussion A. Groundwater Results Groundwater samples were collected from on-site wells throughout the year in accordance with the station RGPP. Analytical results and anomalies are discussed below:

Tritium Samples from 26 locations were analyzed for tritium activity. These locations include 24 wells and the 2 yard drains sampled during the quarterly sampling events as part of the RGPP program. Tritium was not detected in wells at or near the owner-controlled boundary. The location most representative of potential offsite user of drinking water is less than the MDC.

Low levels of tritium were detected at concentrations greater than the minimum detectable concentration (MDC) in 11 of the 26 locations (24 groundwater monitoring wells and the 2 yard drain locations). The tritium concentrations ranged from the detection limit to 12,800 pCi/L.

(Table B-I.1, Appendix B)

Strontium Sr-89 and Sr-90 were not detected in any of the samples.

(Table B-I.1, Appendix B)

Gross Alpha (dissolved and suspended)

Gross Alpha analyses in the dissolved and suspended fractions were performed on 15 groundwater samples during 2020. Fifteen (15) groundwater locations refer to the 13 wells and the 2 yard drains sampled during the quarterly sampling events as part of the RGPP program.

Gross Alpha (dissolved) was detected in 3 of 15 groundwater locations analyzed. The concentrations ranged from 1.2 to 5.8 pCi/L.

Gross Alpha (suspended) was detected in 5 of 15 groundwater locations analyzed. The concentrations ranged from 1.3 to 5.4 pCi/L.

The activity detected is consistent with historical levels. The activity detected is naturally occurring and the levels are considered to be background. (Table B-I.1, Appendix B)

Hard-To-Detect Hard-To-Detect analyses were performed on one groundwater location.

The analyses included Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, U-238, Fe-55 and Ni-63.

8

U-234 was detected in the one location at a concentration of 0.23 pCi/L.

The activity detected is naturally occurring and the levels are considered to be background. All other Hard-To-Detect analyses were less than the MDC. (Table B-I.3, Appendix B)

Gamma Emitters No power-production gamma emitters were detected in any of the samples.

(Table B-I.2, Appendix B)

B. Surface Water Results Surface Water samples were collected from six surface water locations throughout the year in accordance with the station RGPP. Analytical results are discussed below:

Tritium Samples from six locations were analyzed for tritium activity. Tritium was not detected in any surface water locations greater than the MDC.

(Table B-II.1, Appendix B)

Gamma Emitters Samples from two locations were analyzed for gamma emitters. No gamma emitters were detected in any of the samples.

(Table B-II.2, Appendix B).

C. Precipitation Water Results Samples were collected at fourteen locations (1A, 1B, 1S, 1SSE, 1Z, 4M, PB-P1, PB-P2, PB-P3, PB-P4, PB-P5, PB-P6, PB-P7, and PB-P8) in accordance with the station RGPP. The following analysis was performed:

Tritium Samples from fourteen locations were analyzed for tritium activity. Tritium activity was detected in two locations greater than the MDC. The concentrations ranged from 400 to 518 pCi/L. (Table B-III.1, Appendix B)

D. Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006)(1) around PBAPS. The water well inventory was updated in 2012(4). The updated water well database search indicated a new water well off Station property within a one mile radius of the Station. The well is described as a test well and its use is listed as unused. In summary, there were no significant changes in off Station groundwater use from 2006-2012.

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E. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and GEL are presented in the AREOR.

F. Leaks, Spills and Releases There were no inadvertent leaks, spills or releases of water containing licensed material to the environment in 2020.

G. Trends A tritium plume has been identified northeast of the Unit 3 Turbine Building.

The plume extends eastward toward well MW-PB-4. The plume is bounded on the north by wells MW-PB-12 and MW-PB-22. The plume is bounded on the south by wells MW-PB-20 and MW-PB-21.

The tritium plume is a result of licensed material entering the groundwater through degraded floor seams and penetration seals in the Unit 3 Turbine Building. The activity currently detected in the Unit 3 Turbine Building monitoring wells, MW-PB-24, 25, 26 and 27, is the result of legacy licensed material under the turbine building being transported eastward by natural hydrogeologic groundwater flow.

Tritium activity in the Unit 3 Turbine Building monitoring wells are trended.

Any adverse trend is captured in the Stations Corrective Action Program.

H. Investigations MW-PB-4 In 2006, monitoring wells MW-PB-1 through MW-PB-14 were installed.

Tritium activity was detected in MW-PB-4, located north of the Unit 3 Circulating Water Pump Structure and MW-PB-12, north of the Administration Building. Groundwater flow on site is from west to east.

Monitoring wells were installed to the west, southwest and northwest of monitoring wells MW-PB-4 and MW-PB-12. The wells with the highest tritium activity are the wells installed directly east of and adjacent to the Unit 3 Turbine Building, wells MW-PB-24, 25, 26 and 27.

Investigation of potential sources identified that the likely source of groundwater contamination was due to degraded floor seams in the Unit 3 Turbine Building Moisture Separator area 116' elevation. Leaks internal to the building entered the groundwater through the degraded floor seams.

The floor seams were repaired in August 2010. The floor in the Unit 3 Turbine Building Moisture Separator area 116' elevation was sealed and recoated in October 2011.

MW-PB-29, 30 and 31 An extent-of-condition inspection of the Unit 2 Turbine Building Moisture Separator area 116' elevation floor was performed in October 2010. Minor 10

degradation of the floor seams was identified and repaired. In May 2011, monitoring wells MW-PB-29 and 30 were installed directly east of and adjacent to the Unit 2 Turbine Building; MW-PB-31 was installed southeast of and adjacent to the Unit 2 Turbine Building. These wells were installed to determine if a condition existed east of the Unit 2 Turbine Building that is similar to the condition east of the Unit 3 Turbine Building.

Tritium activity in these wells ranged from less than the MDC to 2,720 pCi/L. Samples from these wells were also analyzed for gamma-emitting isotopes and hard-to-detect radionuclides. All results are less than the MDC for each isotope.

The Unit 2 Turbine Building Moisture Separator floor 116' elevation floor was sealed and recoated in October 2012. Groundwater intrusion into a ventilation pit on the east side of the area was identified. The groundwater was removed and degraded seams in the ventilation pit were successfully repaired.

MW-PB-24, 25, 26 and 27 Wells MW-PB-24, 25, 26 and 27 are considered the wells of primary interest. These wells were sampled on a frequency ranging from weekly to quarterly. Below are 3 tables. The first lists the highest tritium activity of the wells of primary interest and the date of the sampling. The second table lists the highest tritium activity of the wells during 2020. The third table lists the activity of the wells from the last sampling of 2020. The tritium activity is in pCi/L.

Well # Tritium Activity Date MW-PB-24 1,530 06/06/2018 MW-PB-25 161,000 03/08/2010 MW-PB-26 196,000 03/08/2010 MW-PB-27 71,800 2/22/2010 Well # Tritium Activity Date MW-PB-24 681 01/16/2020 MW-PB-25 12,800 02/28/2020 MW-PB-26 306 09/17/2020 MW-PB-27 507 09/15/2020 Well # Tritium Activity Date MW-PB-24 267 12/10/2020 MW-PB-25 7,970 12/10/2020 MW-PB-26 245 12/10/2020 MW-PB-27 357 12/10/2020 Potential sources of tritium in the groundwater are investigated via procedural processes and documented in the corrective action program.

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The most likely pathway for tritium to enter the groundwater has been determined to be leaks internal to the Unit 3 Turbine Building Moisture Separator 116', migrating through degraded floor seams or other unidentified openings in the floor.

I. Actions Taken

1. The Unit 3 Condensate storage tank moat, sump and valve pit were cleaned and recoated to eliminate a potential pathway for licensed material to enter the groundwater. These activities were completed under work order 04602739 and work request 01339203.
2. During P3R21, the Unit 3 Recombiner Jet Compressor room floor drains were found plugged. One plug was removed, and the second plug was modified to allow water to drain to the radwaste system in the event of a licensed material leak. This was completed under work request 01369404.
3. Installation of Monitoring Wells No groundwater monitoring wells were installed in 2020.
4. Actions to Recover/Reverse Plumes There were no actions to recover the plume.

J. Deviations The data tables show that duplicate samples were obtained at several wells during 2020. These duplicate samples were obtained and analyzed for quality control purposes.

An exception was made, per Exelon, due to the COVID-19 pandemic. The quarterly sampling was waived for the 2nd quarter of 2020.

V. References

1. Conestoga Rovers and Associates, Fleetwide Assessment, Peach Bottom Atomic Power Station, Delta, PA, Fleetwide Assessment, Rev. 1, September 1, 2006.
2. Peach Bottom Atomic Power Station (PBAPS), Environs Radiation Monitoring Program, Preoperational Summary Report Units 2 and 3, June 1977.
3. Peach Bottom Atomic Power Station (PBAPS), Environs Radiation Monitoring Program, Preoperational Summary Report Units 2 and 3, September 1970-August 1973, January 1974.
4. Conestoga Rovers and Associates, Hydrogeologic Investigation Report, Peach Bottom Atomic Power Station, November 2012.
5. AMO Environmental Decisions, 2020 RGPP Summary Monitoring Reports, April 2020, August 2020, October 2020 and February 2020.

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APPENDIX A SAMPLING LOCATIONS, DISTANCE AND DIRECTION

Intentionally left blank TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Peach Bottom Atomic Power Station, 2020 Site Site Type Sector Distance (ft.)

MW-PB-1 Groundwater Well SW 1,166.6 MW-PB-2 Groundwater Well WNW 309.0 MW-PB-3 Groundwater Well SSE 709.7 MW-PB-4 Groundwater Well ENE 350.2 MW-PB-5 Groundwater Well NNW 1,146.1 MW-PB-6 Groundwater Well NE 1,072.4 MW-PB-7 Groundwater Well SE 813.9 MW-PB-8 Groundwater Well SE 1,167.0 MW-PB-10 Groundwater Well SSE 1,125.1 MW-PB-12 Groundwater Well NNE 317.2 MW-PB-13 Groundwater Well NW 329.4 MW-PB-15 Groundwater Well SE 1,087.9 MW-PB-16 Groundwater Well SE 1,101.6 MW-PB-18 Groundwater Well SE 1,010.0 MW-PB-19 Groundwater Well NW 226.8 MW-PB-20 Groundwater Well E 260.5 MW-PB-22 Groundwater Well NE 315.4 MW-PB-23 Groundwater Well NW 249.6 MW-PB-24 Groundwater Well N 185.9 MW-PB-25 Groundwater Well N 159.7 MW-PB-26 Groundwater Well NNE 121.1 MW-PB-27 Groundwater Well NNE 139.1 MW-PB-28 Groundwater Well NW 249.6 MW-PB-29 Groundwater Well SE 325.0 MW-PB-30 Groundwater Well SE 379.2 MW-PB-31 Groundwater Well SE 450.1 SW-PB-1 Surface Water NNW 2,850.5 SP-PB-1 Groundwater Seep S 514.2 SP-PB-2 Groundwater Seep WNW 311.6 SP-PB-3 Groundwater Seep NNW 1,281.1 SW-PB-5 Surface Water SE 675.1 SW-PB-6 Surface Water SE 1,305.9 U/2 YARD DRAIN SUMP Groundwater SSE 498.7 U/3 YARD DRAIN SUMP Groundwater WSW 175.8 1A Precipitation Water ESE 1,271 1B Precipitation Water NW 2,587 1S Precipitation Water S 1,315 1SSE Precipitation Water SSE 1,312 1Z Precipitation Water SE 1,763 4M Precipitation Water SE 45,989 PB-P1 Precipitation Water PB-P2 Precipitation Water PB-P3 Precipitation Water PB-P4 Precipitation Water PB-P5 Precipitation Water PB-P6 Precipitation Water PB-P7 Precipitation Water PB-P8 Precipitation Water A-1

Figure A-1 Well Water Locations, Peach Bottom Atomic Power Station, 2020 A-2

Figure A-2 RGPP Monitoring Locations Peach Bottom Atomic Power Station, 2020 A-3

Figure A-3 RGPP Precipitation Monitoring Locations Peach Bottom Atomic Power Station, 2020 A-4

APPENDIX B DATA TABLES

Intentionally left blank TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-PB-1 08/06/20 < 192 MW-PB-1 08/06/20 DUP < 198 MW-PB-1 08/06/20 GEL < 151 MW-PB-2 02/18/20 < 183 MW-PB-2 08/03/20 < 181 MW-PB-3 02/18/20 < 180 MW-PB-3 02/18/20 DUP < 181 MW-PB-3 02/18/20 GEL < 189 MW-PB-3 08/05/20 < 182 MW-PB-4 02/18/20 < 182 MW-PB-4 08/03/20 < 177 MW-PB-5 08/06/20 < 195 MW-PB-5 08/06/20 DUP < 194 MW-PB-5 08/06/20 GEL < 144 MW-PB-6 08/20/20 < 173 MW-PB-7 02/19/20 < 178 MW-PB-7 08/06/20 < 192 MW-PB-7 08/06/20 DUP < 178 MW-PB-7 08/06/20 GEL < 150 MW-PB-8 02/19/20 < 181 MW-PB-8 08/06/20 < 194 < 6.7 < 0.8 < 1.1 < 0.8 MW-PB-8 12/08/20 < 189 MW-PB-8 12/08/20 DUP < 191 MW-PB-8 12/08/20 GEL < 166 MW-PB-10 02/19/20 < 180 MW-PB-10 08/06/20 < 196 < 7.8 < 0.7 < 0.6 5.4 +/- 1.5 MW-PB-10 12/08/20 < 186 MW-PB-12 02/19/20 < 186 MW-PB-12 02/19/20 DUP < 185 MW-PB-12 02/19/20 NP < 180 MW-PB-12 02/19/20 GEL < 191 MW-PB-12 08/03/20 < 181 MW-PB-13 02/19/20 < 184 MW-PB-13 08/03/20 < 180 MW-PB-15 02/19/20 < 181 MW-PB-15 08/06/20 < 177 < 8.1 < 0.7 < 1.3 < 1.1 MW-PB-15 12/08/20 < 191 MW-PB-15 12/08/20 DUP < 184 MW-PB-15 12/08/20 GEL < 169 MW-PB-16 02/19/20 < 177 MW-PB-16 08/06/20 < 193 < 5.9 < 0.6 5.8 +/- 1.2 < 1.1 MW-PB-16 12/08/20 < 190 MW-PB-19 02/18/20 < 179 MW-PB-19 08/03/20 < 179 < 5.7 < 0.7 < 0.5 < 0.7 MW-PB-19 12/10/20 < 187 MW-PB-20 02/18/20 < 180 MW-PB-20 02/18/20 NP < 177 MW-PB-20 08/03/20 < 180 < 4.7 < 0.8 < 0.9 4.1 +/- 1.7 MW-PB-20 12/10/20 < 188 MW-PB-22 02/18/20 238 +/- 120 MW-PB-22 02/18/20 NP 315 +/- 122 MW-PB-22 08/03/20 295 +/- 123 MW-PB-24 01/16/20 681 +/- 146 MW-PB-24 02/18/20 602 +/- 139 MW-PB-24 02/18/20 NP 677 +/- 137 B-1

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-PB-24 03/19/20 267 +/- 127 MW-PB-24 04/15/20 < 195 MW-PB-24 05/19/20 301 +/- 122 MW-PB-24 06/23/20 434 +/- 132 MW-PB-24 07/28/20 436 +/- 144 MW-PB-24 08/05/20 384 +/- 136 MW-PB-24 09/15/20 492 +/- 132 MW-PB-24 10/29/20 < 184 MW-PB-24 11/18/20 < 175 MW-PB-24 12/10/20 267 +/- 129 MW-PB-25 01/16/20 12400 +/- 1290 MW-PB-25 02/18/20 12800 +/- 1330 MW-PB-25 02/18/20 NP 11300 +/- 1180 MW-PB-25 03/19/20 2470 +/- 311 MW-PB-25 04/15/20 6940 +/- 757 MW-PB-25 05/19/20 12300 +/- 1280 MW-PB-25 06/23/20 10200 +/- 1070 MW-PB-25 07/28/20 12300 +/- 1290 MW-PB-25 08/05/20 839 +/- 159 < 5.3 < 0.8 < 0.7 < 1.1 MW-PB-25 09/17/20 1300 +/- 197 MW-PB-25 10/29/20 6600 +/- 718 MW-PB-25 11/18/20 7690 +/- 829 MW-PB-25 12/10/20 7970 +/- 855 MW-PB-26 01/16/20 226 +/- 129 MW-PB-26 02/18/20 < 183 MW-PB-26 02/18/20 NP < 181 MW-PB-26 03/19/20 214 +/- 122 MW-PB-26 04/15/20 < 188 MW-PB-26 05/19/20 < 176 MW-PB-26 06/23/20 < 181 MW-PB-26 07/28/20 292 +/- 135 MW-PB-26 08/05/20 < 199 < 7.1 < 0.6 1.2 +/- 0.8 < 1.1 MW-PB-26 09/17/20 306 +/- 122 MW-PB-26 10/29/20 211 +/- 122 MW-PB-26 11/18/20 < 175 MW-PB-26 12/10/20 245 +/- 127 MW-PB-27 01/16/20 391 +/- 134 MW-PB-27 02/18/20 377 +/- 129 MW-PB-27 02/18/20 NP 323 +/- 117 MW-PB-27 03/19/20 369 +/- 127 MW-PB-27 04/15/20 < 192 MW-PB-27 05/19/20 379 +/- 124 MW-PB-27 06/23/20 350 +/- 126 MW-PB-27 07/28/20 463 +/- 142 MW-PB-27 08/05/20 401 +/- 139 < 7.1 < 0.7 2.3 +/- 0.8 1.7 +/- 0.8 MW-PB-27 09/15/20 507 +/- 131 MW-PB-27 10/29/20 339 +/- 131 MW-PB-27 11/18/20 226 +/- 115 MW-PB-27 12/10/20 357 +/- 131 MW-PB-28 02/18/20 1260 +/- 196 MW-PB-28 02/18/20 NP 943 +/- 161 MW-PB-28 08/03/20 190 +/- 118 < 6.8 < 0.9 < 1.8 < 1.0 MW-PB-28 12/10/20 1540 +/- 226 MW-PB-28 12/10/20 R1 1670 +/- 235 MW-PB-29 02/18/20 350 +/- 126 B-2

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER AND SEEP SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-PB-29 02/18/20 NP 335 +/- 125 MW-PB-29 08/05/20 532 +/- 147 < 6.1 < 0.7 < 0.5 < 0.9 MW-PB-29 12/10/20 240 +/- 124 MW-PB-30 02/18/20 < 179 MW-PB-30 02/18/20 NP 175 +/- 111 MW-PB-30 08/05/20 487 +/- 143 < 6.2 < 0.7 < 0.5 1.8 +/- 0.9 MW-PB-30 12/10/20 223 +/- 123 MW-PB-31 02/18/20 < 183 MW-PB-31 08/05/20 315 +/- 134 < 7.9 < 0.8 < 0.6 1.3 +/- 0.8 MW-PB-31 12/10/20 < 186 U/2 YARD DRAIN 03/12/20 < 194 U/2 YARD DRAIN 08/19/20 237 +/- 124 < 7.3 < 0.8 < 0.4 < 0.9 U/2 YARD DRAIN 12/11/20 364 +/- 133 U/3 YARD DRAIN 03/12/20 315 +/- 131 U/3 YARD DRAIN 08/19/20 < 178 < 9.4 < 0.8 < 0.2 < 0.9 U/3 YARD DRAIN 12/09/20 1670 +/- 242 B-3

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER AND SEEP WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 MW-PB-1 08/06/20 < 2 < 2 < 5 < 2 < 5 < 3 < 4 < 4 < 2 < 2 < 11 < 3 MW-PB-1 08/06/20 DUP < 2 < 2 < 5 < 2 < 5 < 3 < 4 < 4 < 3 < 2 < 11 < 4 MW-PB-1 08/06/20 GEL < 1 < 1 < 4 < 1 < 3 < 2 < 3 < 1 < 1 < 1 < 16 < 5 MW-PB-2 08/03/20 < 2 < 2 < 3 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 8 < 3 MW-PB-3 08/05/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 8 < 3 MW-PB-4 08/03/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 3 < 2 < 2 < 10 < 3 MW-PB-5 08/06/20 < 2 < 2 < 4 < 2 < 4 < 3 < 4 < 4 < 2 < 2 < 11 < 3 MW-PB-5 08/06/20 DUP < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 4 < 2 < 2 < 10 < 3 MW-PB-5 08/06/20 GEL < 1 < 1 < 3 < 1 < 2 < 1 < 2 < 7 < 1 < 1 < 12 < 4 MW-PB-6 08/20/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 5 < 2 < 2 < 12 < 4 MW-PB-7 08/06/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 9 < 3 MW-PB-7 08/06/20 DUP < 1 < 2 < 3 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 9 < 3 MW-PB-7 08/06/20 GEL < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 9 < 2 < 1 < 15 < 4 MW-PB-8 02/19/20 < 5 < 4 < 10 < 5 < 9 < 6 < 8 < 9 < 5 < 5 < 23 < 7 MW-PB-8 08/06/20 < 2 < 2 < 5 < 2 < 5 < 3 < 4 < 4 < 2 < 2 < 12 < 4 MW-PB-10 02/19/20 < 5 < 5 < 11 < 5 < 12 < 6 < 9 < 10 < 5 < 5 < 21 < 7 MW-PB-10 08/06/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 3 < 2 < 2 < 9 < 3 MW-PB-12 08/03/20 < 2 < 2 < 4 < 2 < 4 < 3 < 4 < 4 < 2 < 2 < 11 < 4 B-4 MW-PB-13 08/03/20 < 2 < 2 < 4 < 2 < 4 < 3 < 3 < 4 < 2 < 2 < 10 < 3 MW-PB-15 02/19/20 < 6 < 6 < 13 < 6 < 15 < 8 < 11 < 9 < 7 < 6 < 33 < 11 MW-PB-15 08/06/20 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 4 < 2 < 2 < 11 < 4 MW-PB-16 02/19/20 < 6 < 6 < 12 < 6 < 13 < 7 < 10 < 11 < 7 < 6 < 30 < 11 MW-PB-16 08/06/20 < 2 < 2 < 4 < 2 < 4 < 3 < 4 < 4 < 2 < 2 < 12 < 4 MW-PB-19 08/03/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 4 < 2 < 2 < 9 < 3 MW-PB-20 08/03/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 4 < 2 < 2 < 10 < 3 MW-PB-22 08/03/20 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 4 < 2 < 2 < 11 < 3 MW-PB-24 08/05/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 8 < 2 MW-PB-25 08/05/20 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 4 < 2 < 2 < 10 < 3 MW-PB-26 08/05/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 3 < 2 < 2 < 9 < 3 MW-PB-27 08/05/20 < 2 < 2 < 4 < 2 < 5 < 3 < 4 < 4 < 2 < 2 < 12 < 4 MW-PB-28 08/03/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 4 < 2 < 2 < 10 < 3 MW-PB-29 08/05/20 < 2 < 2 < 3 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 8 < 3 MW-PB-30 08/05/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 3 < 2 < 2 < 9 < 3 MW-PB-31 08/05/20 < 2 < 2 < 5 < 3 < 5 < 3 < 4 < 5 < 3 < 2 < 13 < 5 U/2 YARD DRAIN 08/19/20 < 1 < 2 < 3 < 2 < 3 < 2 < 3 < 5 < 2 < 2 < 12 < 4 U/3 YARD DRAIN 08/19/20 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 6 < 2 < 2 < 12 < 4

TABLE B-I.3 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROECTION PROGRAM, PEACH BOTTOM ATOMIC STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 MW-PB-8 08/06/20 < 88 < 3.8 MW-PB-10 08/06/20 < 74 < 4.5 MW-PB-15 08/06/20 < 89 < 3.8 MW-PB-16 08/06/20 < 64 < 4.3 MW-PB-25 08/05/20 < 0.17 < 0.04 < 0.17 < 0.12 < 0.13 0.23 +/- 0.12 < 0.06 < 0.09 < 86 < 4.3 B-5

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SP-PB-1 02/18/20 < 180 SP-PB-1 12/08/20 < 188 SP-PB-2 02/18/20 < 181 SP-PB-2 08/05/20 < 193 SP-PB-3 02/19/20 < 176 SW-PB-1 02/19/20 < 180 SW-PB-1 DUP 02/19/20 < 184 SW-PB-1 GEL 02/19/20 < 187 SW-PB-5 02/19/20 < 183 SW-PB-6 02/19/20 < 180 B-6

TABLE B-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 SP-PB-1 12/08/20 < 3 < 3 < 6 < 3 < 6 < 3 < 4 < 5 < 3 < 3 < 14 < 5 SP-PB-2 08/05/20 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 3 < 2 < 2 < 9 < 3 B-7

TABLE B-III.1 CONCENTRATIONS OF TRITIUM IN PRECIPITATION WATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM , PEACH BOTTOM ATOMIC POWER STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 1A 01/02/20 < 175 1A 01/30/20 < 182 1A 02/26/20 < 177 1A 04/02/20 < 153 1A 04/30/20 < 180 1A 05/27/20 < 185 1A 07/01/20 < 155 1B 01/02/20 < 172 1B 01/30/20 < 176 1B 02/26/20 < 175 1B 04/02/20 < 153 1B 04/30/20 < 180 1B 05/27/20 < 184 1B 07/01/20 < 152 1S 01/02/20 < 175 1S 01/30/20 < 181 1S 02/26/20 < 185 1S 04/02/20 < 149 1S 04/30/20 < 180 1S 05/27/20 < 180 1S 07/01/20 < 150 1SSE 01/02/20 < 182 1SSE 01/30/20 < 179 1SSE 02/26/20 < 189 1SSE 04/02/20 < 151 1SSE 04/30/20 < 181 1SSE 05/27/20 < 184 1SSE 07/01/20 < 151 1Z 01/02/20 < 172 1Z 01/30/20 < 180 1Z 02/26/20 < 188 1Z 04/02/20 < 151 1Z 04/30/20 < 182 1Z 05/27/20 < 184 1Z 07/01/20 < 150 4M 01/02/20 < 174 4M 01/30/20 < 180 4M 02/26/20 < 187 4M 04/02/20 < 150 4M 04/30/20 < 180 4M 05/27/20 < 180 4M 07/01/20 < 154 PB-P1 09/17/20 < 185 PB-P1 11/25/20 < 191 PB-P2 09/17/20 < 184 PB-P2 11/25/20 < 191 PB-P3 09/17/20 < 186 PB-P3 11/25/20 < 192 PB-P4 09/17/20 < 179 PB-P4 11/25/20 < 193 PB-P5 09/17/20 < 182 PB-P5 11/25/20 < 191 PB-P6 09/17/20 400 +/- 132 PB-P6 11/25/20 < 188 PB-P7 09/17/20 518 +/- 135 PB-P7 11/25/20 < 192 PB-P8 09/17/20 < 180 PB-P8 11/25/20 < 193 B-8

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