Text

Annual Radiological Environmental Operating Report for the Peach Bottom Power Atomic Power Station, Units 1, 2, and 3, January 1 - December 31, 2023
	ML24150A273
Person / Time
Site:	Peach Bottom
Issue date:	12/31/2023
From:	; Constellation Energy Corp
To:	; Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
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ML24150A271	List: ML24150A272; ML24150A273;
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ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR THE PEACH BOTTOM ATOMIC POWER STATION UNITS 1, 2 AND 3 January 1 - December 31, 2023 Prepared by Constellation Generation Solutions CONSTELLATION ENERGY CORPORATION MAY 2024

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 i

TABLE OF CONTENTS LIST OF FIGURES...................................................................................................................... ii LIST OF TABLES....................................................................................................................... iii I. EXECUTIVE

SUMMARY

........................................................................................................1 II. PEACH BOTTOM ATOMIC POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM......................................................3 II.A. INTRODUCTION......................................................................................................................................... 3 II.B. PROGRAM.................................................................................................................................................... 6 II.B.1 Objectives............................................................................................................................................... 6 II.B.2 Sample Collection and Analysis............................................................................................................ 6 II.B.3 Data Interpretation.............................................................................................................................. 10 II.B.4 Program Exceptions............................................................................................................................. 11 II.B.5 Program Changes................................................................................................................................. 13 II.C. RESULTS AND DISCUSSIONS................................................................................................................. 14 II.C.1 Aquatic Environment........................................................................................................................... 14 II.C.2 Atmospheric Environment.................................................................................................................. 16 II.C.3 Terrestrial Environment.................................................................................................................... 17 II.C.4 Direct Radiation................................................................................................................................... 19 II.D. CONCLUSION............................................................................................................................................. 19 III. REFERENCES......................................................................................................................22 APPENDIX A Sample Locations for the REMP.....................................................................24 APPENDIX B Analysis Results for the REMP........................................................................37 APPENDIX C Quality Assurance Program..............................................................................60 APPENDIX D Land Use Survey................................................................................................83 APPENDIX E Annual Radiological Groundwater Protection Program Report...................86

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 ii LIST OF FIGURES Figure Title Page A-1 Peach Bottom Atomic Power Station Sample Locations...................................................29 A-2 Peach Bottom Atomic Power Station Sample Locations..................................................30 A-3 Peach Bottom Atomic Power Station Sample Locations..................................................31 A-4 Gross Beta in Public Water for the Last Ten Years...........................................................32 A-5 Gross Beta in Air for the Last Ten Years..........................................................................33 A-6 Annual Trending of Air Activity (Gross Beta)..................................................................34 A-7 2023 Monthly Gross Beta Concentrations in Drinking Water, (4L)................................35 A-8 2023 Weekly Gross Beta Concentrations in Air Particulate Samples from Co-Located Air samplers.......................................................................................................................36 D-1 Peach Bottom Atomic Power Station Land Use Census...................................................85 E-2 Well Water Locations Peach Bottom Atomic Power Station..........................................100 E-3 Radiological Groundwater Protection Program Monitoring Locations, Peach Bottom Atomic Power Station......................................................................................................101 E-4 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station...............................................................102

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 iii LIST OF TABLES Table Title Page 1

Synopsis of 2023. Peach Bottom Atomic Power Station Radiological Environmental Monitoring Program.................................................................................................................20 2

Annual Summary of Radioactivity in the Environs of the Peach Bottom Atomic Power Station......................................................................................................................................21 A-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023.....................25 A-2 Radiological Environmental Monitoring Program - OSLD Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023.....................27 B-1 Concentration of Tritium, Gamma Emitters and Gross Beta in Surface and Drinking Water 38 B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish...............................................40 B-3 Concentration of Gamma Emitters in Sediment......................................................................41 B-4 Concentration of Iodine-131 in Filtered Air............................................................................42 B-5 Concentration of Beta Emitters in Air Particulates..................................................................45 B-6 Concentration of Gamma Emitters in Air Particulates............................................................50 B-7 Concentration of Gamma Emitters in Vegetation Samples.....................................................51 B-8 Concentration of Gamma Emitters (including I-131) in Milk.................................................52 B-9 Typical MDA Ranges for Gamma Spectrometry....................................................................56 B-10 Typical LLDs for Gamma Spectrometry.................................................................................57 B-11 Quarterly DLR Results for Peach Bottom Atomic Power Station, 2023.................................58 B-12 Annual DLR Results for Peach Bottom Atomic Power Station, 2023....................................59 C-1 Results of Participation in Cross Check Programs..................................................................64 C-2 Results of Quality Assurance Program....................................................................................69 C-2a Results of Quality Assurance Program Co-Located Air Samplers..........................................79 C-2b Results of Quality Assurance Program Co-Located Air Samplers..........................................81 C-3 Peach Bottom Atomic Power Station ODCM Required LLDs...............................................82 D-1 Land Use Survey......................................................................................................................84 E-1 Locations of Onsite Radiological Groundwater Protection Program - Peach Bottom Atomic Power Station, 2023.................................................................................................................99 E-5 Hard to Detects in Groundwater............................................................................................103 E-6 Concentration of Radiostrontium in Groundwater.................................................................104 E-7 Alpha Isotopic and Transuranics in Groundwater.................................................................105 E-8 Gross Alpha Activity in Groundwater...................................................................................106 E-9 Concentration of Tritium in Groundwater.............................................................................107 E-10 Concentration of Tritium in Precipitation and Subsurface Drainage.....................................109 E-11 Gross Concentration of Gamma Emitters in Groundwater and Subsurface Drainage..........110

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 1

I. EXECUTIVE

SUMMARY

The 2023 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 Constellation Nuclear and covers the period of 1 January 2023 through 31 December 2023. During that time, 1,624 analyses were performed on 1,298 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. There was no tritium detected above the minimum detectable activity. Gross beta activity was detected, but not above the required LLD of 4 pCi/L and was likely due to background radiation. All other non-natural nuclides were below minimum detectable activity.

Fish and sediment samples were analyzed for concentrations of gamma emitting nuclides. All non-natural 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 non-natural 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 were 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.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 2

In 2023, 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:

A.

Radiological Impact on Man Effluent Applicable Organ Estimated Dose

% of Applicable Limit Limit Unit Noble Gas Gamma - Air Dose 2.96E-02 1.48E-01 2.00E+01 mrad Noble Gas Beta - Air Dose 2.02E-02 5.05E-02 4.00E+01 mrad Noble Gas Total Body (gamma) 2.87E-02 2.87E-01 1.00E+01 mrem Noble Gas Skin (Beta) 3.74E-02 1.25E-01 3.00E+01 mrem Gaseous Iodine, Particulate, Carbon-14 &

Tritium Bone 8.13E-02 2.71E-01 3.00E+01 mrem Gaseous Iodine, Particulate & Tritium Thyroid 2.18E-03 7.27E-03 3.00E+01 mrem Liquid Total Body (gamma) 1.93E-03 3.22E-02 6.00E+00 mrem Liquid GI-LLI 3.76E-04 1.88E-03 2.00E+01 mrem Direct Radiation Total Body 0

0.00E+00 2.50E+01 mrem B.

40 CFR 190 Doses 40 CFR 190 Applicable Organ Estimated Dose

% of Applicable Limit Limit Unit Total Body 3.06E-02 1.23E-01 2.50E+01 mrem Thyroid 2.18E-03 2.91E-03 7.50E+01 mrem Other Organ 8.17E-02 3.27E-01 2.50E+01 mrem ODCM 3.8.D.1.d and e.

Total Body 3.06E-02 1.02E+00 3.00E+00 mrem Thyroid 3.18E-02 5.78E-02 5.50E+01 mrem Other Organ 8.17E-02 2.72E+00 3.00E+00 mrem

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 3

II. PEACH BOTTOM ATOMIC POWER STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM II.A. 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 (Ref 1).

Preoperational summary reports (Ref 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, Constellation Generation Solutions (CGS) and GEL Laboratories on samples collected during the period 01 January 2023 through 31 December 2023.

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.

A. 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, as noted in table below.

Radioactivity is measured in curies. A curie is that amount of radioactive

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 4

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.

B. Sources of Radiation As mentioned previously, naturally occurring radioactivity has always been part of our environment. Table 1 shows the typical doses received from natural and man-made sources.

Radiation Sources and Corresponding Doses (1)

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

Source Radiation Dose (mrem/yr)

Internal, inhalation (2) 228 Medical (3) 300 External, space 33 Consumer (4) 13 Internal, ingestion 29 Industrial(5) 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 because 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/yr.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 5

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 results from therapeutic and diagnostic applications of x-rays and radio-pharmaceuticals. 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 2023 operating period.

(1) Information from NCRP Reports 160 and 94 (2) Primarily from airborne radon and its radioactive progeny (3) Includes CT (147 mrem), nuclear medicine (77 mrem), interventional fluoroscopy (43 mrem) and conventional radiography and fluoroscopy (33 mrem)

(4) 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)

(5) Industrial, security, medical, educational, and research

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 6

II.B. PROGRAM II.B.1 Objectives A. Objective of the REMP

1. Provide data on measurable levels of radiation and radioactive materials in the site environs;

2. Validate the radioactive effluent control program by evaluating the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.

B. Implementation of the Objectives

1. Identifying significant exposure pathways

2. Establishing baseline radiological data of media within those pathways

3. Continuously monitoring those media before and during station operation to assess station radiological effects (if any) on man and the environment.

II.B.2 Sample Collection and Analysis Samples for the PBAPS REMP were collected for Constellation Nuclear by contractors to, or personnel of, CGS according to applicable procedures (Ref 8,14,15). Control locations are sample locations that are not expected to be impacted by plant operations and are used to determine a baseline in the environment for each type of sample. This section describes the general collection methods used to obtain environmental samples for the PBAPS REMP in 2023.

The locations of the individual sampling stations are listed in Table A-1 and A-2 and shown in Figures A-1, A-2, and A-3.

Analyses are performed in accordance with applicable procedures (Ref 9,12,13,15) and results are provided in Appendix B for primary REMP Analysis. Analysis results for quality assurance are provided in Appendix C. Analysis results for PBAPS RGPP are provided in Appendix E.

All Samples were collected and analyzed as required except as noted in section II.B.4 Program exceptions.

II.B.2.a 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 the two locations nearest to

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 7

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 and carp) and Predator (smallmouth and hybrid striped 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.

II.B.2.b Atmospheric 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 one cubic foot per minute to obtain a minimum total volume of 280 cubic meters. The weekly filters were composited for a quarterly sample.

II.B.2.c 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, 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. Samples were unavailable after 6/27/23 at Farm J, thus Farm P was moved from a quarterly to a biweekly sample. Farm M-1C was then added as a new monthly sample. Six additional locations (C, D, E, P, W and Y; C and E are the controls) were sampled quarterly through June 2023. Farm C samples were discontinued as of

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 8

5/2/23 so Farm M-15G was added as a new quarterly sample starting in August 2023. 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 based on garden production.

II.B.2.d 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.

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 interest 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. On hills free from local obstructions and within sight of the vents (where practical).

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 9

Each dosimetry location in the environment has 2 OSLD type 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.

II.B.2.e Independent Spent Fuel Storage Installation (ISFSI)

ISFSI was initiated in June 2000. 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 2B follows closely with values from locations 1A, 1D and controls, indicating no impact from the ISFSI on the 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. Detectable facility-related dose at 1R in the 3Q of 2019 (6.4 mrem/std.

qtr), lead 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 was completed in 2020 on a second ISFSI pad which was loaded with Holtec HI-STORM casks. Facility-related dose is expected to increase due to the second ISFSI pad, but remain below the 40CFR190 and 10CFR72.104 limits. In 2023, seven (7) casks were generated and placed on the pad.

In 2023, an evaluation of the background data set for all dosimeters was completed to determine if any changes were required. It was determined the background for dosimeter 1R should be updated. Due to casks being on the ISFSI pad, the dose for this location is elevated and not suitable to be used for the background. Pre-operational dose studies did not use dosimeters that are comparable to OSLDs, therefore, the background of the surrounding dosimeter locations were reviewed and an average of those backgrounds was applied to the 1R calculations. Detectable facility-related dose at 1R was identified as expected following the change. No facility dose was detected at any surrounding dosimeters including 2B.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 10 II.B.3 Data Interpretation The radiological environmental and direct radiation data collected prior to PBAPS becoming operational was used as a baseline with which the 2023 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.

MDA 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 2023 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),

niobium-95 (Nb-95), zirconium-95 (Zr-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 sediment, six nuclides, K-40, Mn-54, Co-58, Co-60, 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.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 11

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 MDA) were recorded, and the mean and two standard deviations 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.

II.B.4 Program Exceptions For 2023 the PBAPS REMP had a sample recovery rate of greater than 99%. Program exceptions are listed below:

1. An exception was recorded for air sampler 5H2 on 3/20/23. Upon arrival to the air sampler, it was observed that the pump was not functioning as expected due to a blown fuse on the pump. The fuse was replaced and the sampler was returned to normal operation. The calculated volume was 60.5m3, however the analysis of the samples met the required MDA's.

2. An exception was recorded for 05/02/23 during quarterly REMP milk sampling.

Milk farm C did not have samples available due to the farmer selling his herd.

Samples will not be available going forward; thus, replacement milk farms were found.

3. An exception was recorded for 7/11/23 during routine biweekly REMP milk sampling. Milk farm J did not have samples available due to the farmer selling his herd. Samples will not be available going forward; thus, replacement milk farms were found.

4. An exception was recorded on 8/31/23, as the second quarter net normalized dose for REMP dosimeter station 1L was 6.3mrem. This dose was due to a shipment of grit drums on 5/31/23 and the transfer of the RWCU pump to LLRWSF on 5/15/23.

No dose was detected at any other dosimeter location, including any in that sector or the surrounding sectors.

5. An exception was recorded on 11/21/23 during review of the 3rd quarter environmental dosimetry. Calculations showed positive annual facility dose of 5.5 mRem at dosimeter Station 1F. This location is not used for 40 CFR190 calculations, so there is no impact on 'dose to man' calculations. If the 5.5 mRem was used in the 40 CFR 190 calculation, the station dose would be still well below (22% of) the 25mRem requirement set forth in ODCMS 3.8.d.1 (a). No dose was detected at any other dosimeter location, including any in that sector or the surrounding sectors.

Annual net normalized dose is still non detectable based on the calculations in the CY-AA-170-1001.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 12

6. An exception was recorded on 2/23/24 during review of the 4th quarter environmental dosimetry. Calculations showed positive annual facility dose of 20.3 mRem at REMP dosimeter station 1L. This location is not used for 40 CFR 190 calculations, so there is no impact on 'dose to man' calculations. If the 20.3mRem were used in the 40 CFR 190 calculation, the station dose would still be well below the total annual whole body dose and critical organ dose limit of 25mRem/year and Total annual thyroid dose limit of 75 mRem/year set forth in ODCMS 3.8.d.1 (a).

Each program exception was reviewed to understand the causes of the program exception and documented in site corrective action program. The occasional equipment breakdowns were unavoidable. The overall sample recovery rate indicates that the appropriate procedures and equipment were in place to assure reliable program implementation.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 13 II.B.5 Program Changes An ODCM revision was presented to PORC to remove milk Farm J and to add the two additional milk farms. Also, the site designations for the milk farms were changed. The new farm designations will be reflected in 2024 according to the chart below:

PBAPS Designation Milk Farm NEW Designation ODCM Farms R

M-11A S

M-7D V

M-13F X

M-15B P

M-4C M-1C Quarterly Farms W

M-9G E

M-1F D

M-3D Y

M-3B M-15G NEW Location Designation X-YZ General code for identification of locations X

Letter designation for sample type (i.e. M for Milk)

Y Angular sector of sampling location, divided into 16 sectors. Sector 1 is centered due North, others are numbered in a clockwise direction Z

Radial zone of sampling location S: on-site location E: 21,120-26,400 feet off-site A: 0-5280 feet off-site F: 26,400-52,800 feet off-site B: 5280-10,560 feet off-site G: 52,800-105,600 feet off-site C: 10,560-15,840 feet off-site H: 105,600-528,000 feet off-site D: 15,840-21,120 feet off-site

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 14 II.C. RESULTS AND DISCUSSIONS All the environmental samples collected during the year were analyzed using CGS laboratory procedures CY-ES-205 and CY-ES-206, except Tritium which was analyzed by GEL Laboratories (GL-RAD-A-002 REV# 24), in accordance with analytical method EPA 906.0 Modified, and Dosimetry analysis performed by Landauer. Table 1 is a Synopsis of the 2023 Radiological Environmental Monitoring Program samples and types of analyses performed. The analytical results for this reporting period are presented in Appendix B and radioactivity in the Environs of the PBAPS are also summarized in Table 2 as required by NUREG 1302 Branch Technical Position Paper (Ref 4) Table 3. For discussion, the analytical results are divided into four categories. The categories are Aquatic Environment, Atmospheric Environment, Terrestrial Environment, and Direct Radiation. These categories are further divided into subcategories according to sample type (e.g. Surface Water/Drinking Water and Aquatic Organisms for Aquatic Environment).

II.C.1 Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, fish, and sediment.

II.C.1.a Surface and Drinking Water

1. Surface Water A summary of the 2023 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 B-1, Appendix B)

Iodine Monthly samples were analyzed for low level I-131. I-131 is a gamma emitter that is analyzed separately to achieve a low level of detection. All results were less than the MDA and the required LLD was met. (Table B-1, Appendix B)

Gamma Spectrometry Monthly samples were analyzed for gamma emitting nuclides. All nuclides were less than the MDA and all required LLDs were met. (Table B-1, Appendix B)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 15

2. Drinking Water The results from the drinking water samples collected in 2023 from indicator locations 13B and 4L as well as control location, 6I are described below:

Gross Beta Samples from all locations were analyzed monthly for concentrations of gross beta activity (Table B-1, Appendix B and Figure A-7 Appendix A). Gross beta activity was detected in all 36 samples. The values ranged from 1.44 to 2.79 pCi/L with a mean value of 2.12 +/- 0.75 pCi/L for indicator locations. For the control location, the values ranged from 1.23-3.20 pCi/L with a mean value of 2.16 +/- 0.76 pCi/L which is less than the required LLD (4 pCi/L) and 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. No tritium activity was detected in any of the 12 samples. All samples measured less than the required MDA (200 pCi/L) and the required LLD was met. (Table B-1, Appendix B)

Iodine Monthly samples were analyzed for low level I-131. I-131 is a gamma emitter that is analyzed separately to achieve a low level of detection. All results were less than the MDA and the required LLD was met. (Table B-1, Appendix B)

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

(Table B-1, Appendix B)

A Radiological Groundwater Protection Program (RGPP) was established in 2006 as part of a Constellation Nuclear (Exelon) fleetwide assessment of potential groundwater intrusion from the operation of the Station. Results and Discussion of groundwater samples are covered in Appendix E.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 16 II.C.1.b Aquatic Organisms The edible portions of Fish (predator and bottom feeder) samples collected from locations 4 and 6 in 2023 were analyzed for concentrations of gamma-emitting nuclides.

For all samples analyzed, naturally occurring K-40 was found at all stations and ranged from 2,770 to 4,065 pCi/kg (wet), with a mean value of 3,452 pCi/kg (wet), consistent with levels detected in previous years. No fission or activation products, due to plant operations were found in 2023 and all required LLDs were met.

Table B-2, presents the non-natural gamma radionuclide results for locations 4 and 6, based on the type of fish collected. All sample results were less than the nuclide-specific MDAs and LLD requirements were met. There have been no detectable levels of Cs-137 in fish since 1983.

II.C.1.c Sediment Sediment samples were collected at locations 6F, 4J, and 4T and analyzed for concentrations of gamma-emitting nuclides. No plant related fission or activation products were found in sediment and all LLDs were met. Results are presented in Table B-3, Appendix B. Naturally occurring nuclides were found in all locations. K-40 ranged from 9410 to 24,145 pCi/kg (dry) with a mean value of 15,402 pCi/kg (dry).

II.C.2 Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate and airborne iodine. Airborne iodine and particulate samples were collected and analyzed weekly at five locations (1B, 1C, 1Z/1A, 3A, and 5H2). The control location was 5H2.

Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The filters were replaced weekly and sent to the laboratory for analysis.

II.C.2.a Air Particulate Filters 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).

Detectable gross beta activity was observed at all locations. Onsite results, Group I, ranged from 9.17E-3 to 6.43E-2 pCi/m3, with a mean of 3.13E-2 +/- 2.49E-3 pCi/m3. The results from local community, Group II, ranged from 1.29E-2 to 6.46E-2 pCi/m3 with a mean of 3.83E-2 +/-

2.69E-3 pCi/m3. The control, Group III, results ranged from 8.59E-3 to 5.59E-2 pCi/m3 with a mean of 2.94E-2 +/- 2.52E-3 pCi/m3.

The range of detectable results and mean value from all locations are generally within range of their 2 sigma errors, indicating the gross beta activity is not a result of the operation of PBAPS. As shown in Figure A-6, Appendix A, the control location data mirrors the individual

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 17 on-site locations and community trends. In Figure A-5, Appendix A, a rising trend in gross beta results has been identified over the past three years with results stabilizing in 2023. This rise has also been noted in the control location further confirming the trend is not attributed to plant operations.

Based on individual weekly comparisons, there was no statistical difference between the Control and Indicator radioactive particulate concentrations. The average for the control samples were 0.029 pCi/m3, and the average for the indicators were 0.033 pCi/m3 for the period of January to December 2023. Maximum weekly concentrations for each station were less than 0.070 pCi/m3. The community represented location, 3A, also showed an average of 0.038 pCi/m3 in 2023 with weekly measurements ranging from.013 to 0.065 pCi/m3. The results of these analyses are presented in Table B-5, Appendix B. All LLDs were met for samples successfully collected.

The particulate filters from each sampling location were saved and a 13-week composite was made. These air particulate samples were then analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected. The results of these analyses are listed in Tables B-6, Appendix B. Gross beta and cosmogenic, naturally occurring beryllium-7 (Be-7) were detected at levels consistent with those detected in previous years. All power production nuclides were less than the MDA and all required LLDs were met.

II.C.2.b Air Iodine High-sensitivity I-131 analyses were performed on weekly air samples. All results were less than the minimum detectable concentration.

Radioiodine cartridges are placed at five locations. These cartridges are changed and analyzed each week. These samples were analyzed for radioiodine species and exhibited no detectable concentrations of I-131 during the year and is consistent with historical trends. Table B-4 lists the sample collection period and if the sample successfully met MDA.

II.C.3 Terrestrial Environment II.C.3.a Vegetation Broadleaf vegetation was collected monthly, during the growing season, at four locations (1C, 2Q, 3Q and 55). The control location was 55.

Throughout the growing season of 2023, 48 samples of various green leafy vegetation (Swiss chard, cabbage, collards, kale, broccoli, etc.) were collected and analyzed for concentrations of gamma emitting nuclides (Table B-7, Appendix B). The results are discussed below:

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 18 Gamma Spectrometry Naturally occurring nuclides were found in all samples. Naturally occurring K-40 activity was found in all samples and ranged from 1202 to 7669 pCi/kg (wet), with a mean of 3455 pCi/kg (wet). All power production nuclides were less than the MDA and all required LLDs were met.

Data for Non-Natural Gamma Emitters is given in Table B-7.

II.C.3.b Milk During 2023, 144 milk samples were collected and analyzed from the following locations: D, J, P, R, S, W, X, Y, M-1C, and M-15G (indicators) and C, E, V (controls). Farm J samples were discontinued as of 7/11/23 and was replaced with a new farm M-1C. Farm C samples were discontinued as of 5/2/23 and was replaced with new farm M-15G. Also, Farm P was moved from quarterly sampling to biweekly/monthly sampling as of 8/22/23. The results are described as follows:

Iodine-131 Milk samples from all locations were analyzed for concentrations of I-131 (Tables B-8, Appendix B). All results were less than the MDA for I-131 and all required LLDs were met.

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 B-8, Appendix B). Naturally occurring K-40 was found in all samples and ranged from 1,122 to 1,644 pCi/L, with a mean value of 1374 +/-pCi/L. All other nuclides were less than the MDA and all required LLDs were met.

There was no Cs-134 or Cs-137 detected in the milk samples collected in 2023. Samples were routinely counted to MDAs that are less than half the required LLDs to be conservative.

Cow milk samples were analyzed for concentrations of I-131 and gamma-emitting nuclides.

Concentrations of naturally occurring K-40 were consistent with those detected in previous years. No fission or activation products were found. Gamma isotopic data is given in Table B-8.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 19 II.C.4 Direct Radiation Environmental ambient gamma radiation measurements were performed quarterly using Dosimeters of Legal Record (DLR). Levels detected were consistent with those observed in previous years. A review of the dosimetry data for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) indicates no direct dose was received.

Ambient Gamma Radiation Results of OSLD measurements are listed in Table B-11. In 2019, six years of OSLD data (2012-2018) were re-evaluated with the new methodology presented in Constellation Nuclear corporate procedure CY-AA-170-1001, 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. Only Quarterly and Annual Normalized Net Dose for each location is reported in Table B-11 and B-12 respectively. 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.

Detectable facility related dose was identified at the ISFSI dosimeter location, 1R, (described below) and at dosimeter location 1L. Location 1L had a positive second quarter facility dose (6.3 mrem) due to a radioactive shipment moving past the dosimeter. This led to a positive annual facility dose of 20.3 mrem. The dosimeter is located within the owner-controlled area and not used for 40 CFR 190 calculations. There is no detectable ambient gamma radiation to the members of the public due to PBAPS operations.

Independent Spent Fuel Storage Installation (ISFSI)

In 2023, an evaluation of the background data set for all dosimeters was completed to determine if any changes were required. It was determined the background for dosimeter 1R should be updated. Due to casks being on the ISFSI pad, the dose for this location is elevated and not suitable to be used for the background. Pre-operational dose studies did not use dosimeters that are comparable to OSLDs, therefore, the background of the surrounding dosimeter locations were reviewed and an average of those backgrounds was applied to the 1R calculations. Detectable facility-related dose at 1R was identified as expected following the change. No facility dose was detected at any surrounding dosimeters including 2B.

II.D. CONCLUSION In assessing the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of The Peach Bottom Atomic Power Station had no adverse radiological impact on the environment.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 20 Table 1 Synopsis of 2023 Peach Bottom Atomic Power Station Radiological Environmental Monitoring Program Sample Type Sampling Frequency1 Number of Locations Number Collected Analysis Analysis Frequency1 Number Analyzed Aquatic Environment Surface Water, Drinking Water MC 5

60 Gamma MC 60 Gross Beta MC 36 Tritium QC 20 Fish2 SA 2

8 Gamma SA 8

Shoreline Sediment SA 3

6 Gamma SA 6

Atmospheric Environment Air Iodine3 W

5 260 I-131 W

260 Air Particulates4 W

5 254 Gross Beta W

260 Gamma QC 20 Terrestrial Environment Milk5 M/BW 6

122 Gamma M/BW 122 Q

5 22 Gamma Q

22 Vegetation6 M

4 48 Gamma M

48 Dosimetry Q

48 384 Direct Radiation Q

384 1 W=Weekly, BW=BiWeekly (15 days), M=Monthly (31 days), Q=Quarterly (92 days), SA=Semiannual, A=Annual, C=Composite 2 Twice during fishing season including at least four species.

3 The collection device contains activated charcoal.

4 Beta counting is performed >= 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following filter change. Gamma spectroscopy performed on quarterly composite of weekly samples.

5 Bi-Weekly during growing season.

6 Monthly during growing season. Samples include broad leaf vegetation.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 21 Table 2 Annual Summary of Radioactivity in the Environs of the Peach Bottom Atomic Power Station Medium or Pathway Sampled (Unit of Measurement)

Type and Total Number of Analyses Performed Lower Limit of Detection (LLD)

Indicator Locations Mean (F)/Range1 Location with Highest Annual Mean Name/Distance &

Direction2 Highest Annual Mean (F) / Range1 Control Locations Mean (F)/Range Aquatic Environment Surface Water, Drinking Water (pCi/L)

Gross Beta (36) 4 2.1 (24/24)

(1.2 - 2.9)

CWA Susquehanna Pumping Sta.

13B 4.1 km ESE 2.2 (12/12)

(1.6 - 2.7) 2.2 (12/12)

(1.2-3.2)

Atmospheric Environment Air Particulates (10-2 pCi/m3)

Gross Beta (260) 1.0 3.3 (208/208)

(0.9-6.5)

Delta, PA Sub. 3A 5.88 km SW 3.8 (52/52)

(1.3-6.5) 2.9 (52/52)

(0.9-5.6)

Dosimetry (mrem/91 days)

OSLD (384)

NA 24.2(352/352)

(13.7-38.3)

Transmission Line Hill/ISFSI Pad 1R 0.85 km SSE 35.3 (8/8)

(30-38.3) 21.7 (32/32)

(16.2-26.0) 1 Mean and range based upon detectable measurements only. Fraction (F) of detectable measurements at specified location is indicated in parentheses.

2 From the centerpoint of the containment building

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 22 III. 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.

Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors, Generic Letter 89-01, Supplement No. 1 (NUREG-1302), April 1991

5. American National Standards Institute/Health Physics Society, (ANSI/HPS) N13.37-2014, Environmental Dosimetry - Criteria for System Design and Implementation

6.

U.S. Nuclear Regulatory Commission, Regulatory Guide 4.13, Revision 2, Environmental Dosimetry - Performance, Specifications, Testing, and Data Analysis, June 2020

7. Code of Federal Regulations 40 CFR 190, Environmental Radiation Protection Standards for Nuclear Power Operations, 1977

8.

Constellation Generation Solutions Sampling Procedures

a. CY-ES-214, Collection of RGPP Water Samples for Radiological Analysis

b. CY-ES-237, Air Iodine and Air Particulate Sample Collection for Radiological

c. CY-ES-239, EIS Collection Exchange of Field Dosimeters for Radiological Analysis

d. CY-ES-241, Vegetation Sample Collection for Radiological Analysis

e. CY-ES-242, Soil and Sediment Sample Collection for Radiological Analysis

f. CY-ES-247, Precipitation Sampling and Collection for Radiological Analysis

9.

Constellation Generation Solutions Analytical Procedures

a. CY-ES-204, Sample Preparation for Gamma Analysis

b. CY-ES-205, Operation of HPGE Detectors with the Genie PC Counting System

c. CY-ES-206, Operation of the Tennelec S5E Proportional Counter

d. CY-ES-246, Sample Preparation for Gross Beta Analysis

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 23 III. REFERENCES (cont.)

10.

Peach Bottom Atomic Power Station 2023 Land use Survey

11. CY-AA-170-1000, Radiological Environmental Monitoring Program (REMP) and Meteorological Program Implementation.

12. Teledyne Browne Engineering, (TBE) 2018 Analysis Procedures Current Revisions

a. TBE-2001 Alpha Isotopic and Pu-241

b. TBE-2006 Iron-55 Activity in Various Matrices

c. TBE-2007 Gamma Emitting Radioisotope Analysis

d. TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices

d. TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation

e. TBE-2013 Radionickel Activity in Various Matrices

f. TBE-2019 Radiostrontium Analysis by Ion Exchange

13. GEL Laboratory Procedures

a. GL-RAD-A-002 Tritium

b. GL-RAD-A-022 Ni-63

c. GL-RAD-A-004 Sr89/90, Liquid

d. GL-RAD-A-040 Fe-55

14. Normandeau Associates, Inc. (NAI) Sampling Procedures Current Revisions

a. Procedure No. ER2 Collection of Silt Samples for Radiological Analysis

b. Procedure No. ER3 Collection of Fish Samples for Radiological Analysis

15. Landauer Incorporated, Analysis procedure proprietary, Current Revision

16. Teledyne Browne Engineering Environmental Services, 4th Quarter 2023 Quality Assurance Report, January - December 2023

17. GEL 2023 Annual Environmental Quality Assurance Report for the Radiological Environmental Monitoring Program (REMP)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 24 APPENDIX A Sample Locations for the REMP Appendix A contains information concerning the environmental samples which were collected during this operating period.

Sample locations and specific information about individual locations for the PBAPS are given in Table A-1 and A-2. Figure A-1 shows the Environmental Sampling Locations within 1 mile of the Peach Bottom Atomic Power Station. Figures A-2 shows the Environmental Sampling Locations Between 1 and 5 miles and A-3 shows the locations greater than 5 miles from Peach Bottom Atomic Power Station.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 25 TABLE A-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023 Location Location Description Distance & Direction 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 (Control) 30,500 feet NW 13B Chester Water Authority (CWA) Susquehanna Pumping Station-Composite 13,300 feet ESE 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 J1 5,100 feet W R

4,900 feet SW S

19,100 feet SE V

(Control) 32,600 feet W M-1C2 15,000 feet N P3 10,900 feet ENE

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 26 TABLE A-1 (Cont.)

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023 Location Location Description Distance & Direction from Site G. Milk-Quarterly C4 (Control) 50,400 feet NW D

18,500 feet NE E

(Control) 46,100 feet N W

89,200 feet S Y

10,500 feet NE M-15G5 9,500 feet NW H. Food Products 1C 4,700 feet SSE 2Q 9,200 feet SW 3Q 9.500 feet W 55 (Control) 51,900 feet NE 1 Farm J was discontinued; see section II.C.3.b 2 Farm M-1C was added; see section II.C.3.b 3 Farm P was changed from quarterly to biweekly/monthly sampling; see section II.C.3.b 4 Farm C was discontinued; see section II.C.3.b 5 Farm M-15G was added; see section II.C.3.b

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 27 TABLE A-2 Radiological Environmental Monitoring Program - OSLD Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023 Location Location Description Distance & Direction from Site 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 140o 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 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

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 28 TABLE A-2 (cont.)

Radiological Environmental Monitoring Program - OSLD Locations, Distance and Direction from Reactor Buildings, Peach Bottom Atomic Power Station, 2023 Location Location Description Distance & Direction from Site 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

Nearest Residents

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 29 Figure A-1 Peach Bottom Atomic Power Station Sample Locations Environmental Sampling Locations Within 1 mile of the Peach Bottom Atomic Power Station, 2023 Map shown is updated with new milk locations and new milk designations.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 30 Figure A-2 Peach Bottom Atomic Power Station Sample Locations Environmental Sampling Locations Between 1 and 5 miles from the Peach Bottom Atomic Power Station, 2023 Map shown is updated with new milk locations and new milk designations.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 31 Figure A-3 Peach Bottom Atomic Power Station Sample Locations Environmental Sampling Locations Greater than 5 miles from the Peach Bottom Atomic Power Station, 2023 Map shown is updated with new milk locations and new milk designations.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 32 Figure A-4 Gross Beta in Public Water for the Last Ten Years

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 33 Figure A-5 Gross Beta in Air Samples for the Last Ten years

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 34 Figure A-6 Annual Trending of Air Activity (Gross Beta)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 35 Figure A-7 2023 Monthly Gross Beta Concentrations in Drinking Water, (4L) Split between CGS and TBE

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 36 Figure A-8 2023 Weekly Gross Beta Concentrations in Air Particulate Samples from Co-Located Air samplers 1Z and 1A Analyzed by CGS and TBE as 10-2pCi/m3

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 37 APPENDIX B Analysis Results for the REMP Appendix B is a presentation of the analytical results for the Peach Bottom Atomic Power Station radiological environmental monitoring programs.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 38 Table B-1 Concentration of Gamma Emitters, Tritium, and Gross Beta in Surface and Drinking Water (Results in units of pCi/L +/- 2)

Sample Code Sample Date Gamma Emitters Tritium2 Gross Beta3 2 error 1LL 1 2/1/2023 ND Units 2 and 3 Intake 3/1/2023 ND Composite 3/29/2023

<108 ND 4/26/2023 ND 5/31/2023 ND 6/28/2023

<144 ND 7/26/2023 ND 8/30/2023 ND 9/27/2023

<160 ND 11/1/2023 ND 11/29/2023 ND 12/27/2023

<167 ND 1MM 2/1/2023 ND Canal Discharge 3/1/2023 ND Composite 3/29/2023

<110 ND 4/26/2023 ND 5/31/2023 ND 6/28/2023

<144 ND 7/26/2023 ND 8/30/2023 ND 9/27/2023

<158 ND 11/1/2023 ND 11/29/2023 ND 12/27/2023

<167 ND 4L 2/2/2023 1.76 0.71 Conowingo Dam 3/2/2023 2.39 0.72 Composite 3/30/2023

<110 2.10 0.76 4/27/2023 2.40 0.75 6/1/2023 2.09 0.76 6/29/2023

<135 1.24 0.73 7/27/2023 1.46 0.70 8/30/2023 1.35 0.74 9/27/2023

<124 1.64 0.72 11/1/2023 2.61 0.76 11/29/2023 2.90 0.82 12/28/2023

<167 2.42 0.80

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 39 Table B-1 (cont.)

Concentration of Gamma Emitters, Tritium, and Gross Beta in Surface and Drinking Water Results in units of pCi/L +/- 2)

Sample Code Sample Date Gamma Emitters Tritium2 Gross Beta3 2 error 6I 1 2/2/2023 1.23 0.66 Holtwood Dam 3/2/2023 2.15 0.70 Hydroelectric Station 3/30/2023

<105 2.01 0.75 4/27/2023 2.64 0.77 6/1/2023 2.94 0.82 6/29/2023

<146 1.46 0.75 7/27/2023 1.89 0.73 8/30/2023 1.34 0.74 9/27/2023

<161 1.78 0.73 11/1/2023 3.20 0.80 11/29/2023 2.50 0.80 12/28/2023

<167 2.80 0.83 13B 1/30/2023 2.67 0.77 Chester Water 2/27/2023 2.63 0.73 Authority 3/27/2023

<111 2.48 0.79 Composite 4/24/2023 2.2 0.73 5/30/2023 2.28 0.77 6/26/2023

<151 1.78 0.77 7/24/2023 2.3 0.76 8/28/2023 1.64 0.76 9/25/2023

<122 1.81 0.73 10/30/2023 2.02 0.72 11/27/2023 2.23 0.78 12/26/2023

<167 2.42 0.80 1 Control Location 2 Tritium result for the quarterly composite 3 ND, No Data, analysis not required

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 40 Table B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Sample Type Gamma Emitters 4

6/8/2023 Predator Fish Conowingo Pond 6/8/2023 Bottom Feeder Fish 10/6/2023 Bottom Feeder Fish 10/11/2023 Predator Fish 61 6/12/2023 Bottom Feeder Fish Holtwood Pond 6/13/2023 Predator Fish 10/12/2023 Bottom Feeder Fish 10/12/2023 Predator Fish 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 41 Table B-3 Concentration of Gamma Emitters in Sediment (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Gamma Emitters 4J Conowingo Pond 6/14/2023 near Berkins Run 11/30/2023 4T Conowingo Pond 6/14/2023 near Conowingo Dam 11/30/2023 6F1 Holtwood Dam 6/14/2023 11/30/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 42 Table B-4 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

End Date GROUP I GROUP II GROUP III 1B 1C 1Z 3A 5H2 1 1/3/2023 1/5/2023 1/9/2023 1/12/2023 1/17/2023 1/19/2023 1/23/2023 1/26/2023 1/31/2023 2/2/2023 2/7/2023 2/9/2023 2/13/2023 2/16/2023 2/20/2023 2/23/2023 2/27/2023 3/2/2023 3/6/2023 3/9/2023 3/13/2023 3/16/2023 3/20/2023 3/23/2023 3/27/2023 3/30/2023 4/3/2023 4/5/2023 4/10/2023 4/13/2023 4/17/2023 4/20/2023 4/24/2023 4/27/2023 1 Control Location

<MDA (I-131)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 43 Table B-4 (cont.)

Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

End Date GROUP I GROUP II GROUP III 1B 1C 1Z 3A 5H2 1 5/1/2023 5/4/2023 5/8/2023 5/11/2023 5/15/2023 5/18/2023 5/22/2023 5/25/2023 5/30/2023 6/1/2023 6/5/2023 6/8/2023 6/12/2023 6/15/2023 6/20/2023 6/22/2023 6/26/2023 6/29/2023 7/3/2023 7/6/2023 7/10/2023 7/13/2023 7/17/2023 7/20/2023 7/24/2023 7/27/2023 7/31/2023 8/3/2023 8/7/2023 8/10/2023 8/14/2023 8/17/2023 8/21/2023 8/24/2023 1 Control Location

<MDA (I-131)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 44 Table B-4 (cont.)

Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

End Date GROUP I GROUP II GROUP III 1B 1C 1Z 3A 5H2 1 8/28/2023 8/30/2023 9/5/2023 9/7/2023 9/11/2023 9/14/2023 9/18/2023 9/20/2023 9/25/2023 9/27/2023 10/2/2023 10/4/2023 10/9/2023 10/11/2023 10/16/2023 10/18/2023 10/23/2023 10/26/2023 10/30/2023 11/1/2023 11/6/2023 11/8/2023 11/13/2023 11/15/2023 11/20/2023 11/21/2023 11/27/2023 11/29/2023 12/4/2023 12/7/2023 12/11/2023 12/13/2023 12/19/2023 12/20/2023 12/27/2023 12/28/2023 1 Control Location

<MDA (I-131)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 45 Table B-5 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Sample Group I Group II Group III Period 1B 1C 1Z 3A 5H2 (Control)

End Date Activity 2

Activity 2

1/3/2023 3.95E-02 2.71E-03 1/5/2023 3.49E-02 2.52E-03 3.60E-02 2.56E-03 4.10E-02 2.69E-03 4.90E-02 2.91E-03 1/9/2023 2.90E-02 2.57E-03 1/12/2023 3.87E-02 2.69E-03 3.33E-02 2.53E-03 4.06E-02 2.74E-03 5.21E-02 3.03E-03 1/17/2023 2.80E-02 2.16E-03 1/19/2023 2.47E-02 2.21E-03 2.13E-02 2.10E-03 2.46E-02 2.21E-03 3.24E-02 2.45E-03 1/23/2023 1.56E-02 2.12E-03 1/26/2023 1.64E-02 1.89E-03 1.66E-02 2.03E-03 1.69E-02 1.97E-03 2.23E-02 2.10E-03 1/31/2023 3.14E-02 2.25E-03 2/2/2023 3.37E-02 2.58E-03 3.21E-02 2.52E-03 3.50E-02 2.63E-03 4.42E-02 2.87E-03 2/7/2023 3.77E-02 2.65E-03 2/9/2023 4.28E-02 2.77E-03 4.05E-02 2.71E-03 4.24E-02 2.76E-03 5.60E-02 3.10E-03 2/13/2023 4.96E-02 3.20E-03 2/16/2023 3.39E-02 2.55E-03 3.21E-02 2.46E-03 3.50E-02 2.58E-03 4.39E-02 2.78E-03 2/20/2023 3.03E-02 2.43E-03 2/23/2023 2.87E-02 2.36E-03 2.57E-02 2.30E-03 3.04E-02 2.41E-03 4.00E-02 2.73E-03 2/27/2023 3.30E-02 2.49E-03 3/2/2023 2.36E-02 2.20E-03 2.19E-02 2.15E-03 2.48E-02 2.24E-03 3.31E-02 2.50E-03 3/6/2023 2.07E-02 2.21E-03 3/9/2023 2.38E-02 2.22E-03 2.26E-02 2.18E-03 2.62E-02 2.30E-03 3.13E-02 2.45E-03 3/13/2023 2.01E-02 2.06E-03

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 46 Table B-5 (cont.)

Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Sample Group I Group II Group III Period 1B 1C 1Z 3A 5H2 (Control)

End Date Activity 2

Activity 2

3/16/2023 1.81E-02 2.01E-03 1.77E-02 2.00E-03 1.82E-02 2.02E-03 2.41E-02 2.22E-03 3/20/2023 1.96E-02 6.85E-03 3/23/2023 3.49E-02 2.51E-03 3.33E-02 2.46E-03 3.48E-02 2.51E-03 4.31E-02 2.73E-03 3/27/2023 3.26E-02 2.54E-03 3/30/2023 3.41E-02 2.55E-03 3.10E-02 2.46E-03 3.42E-02 2.55E-03 4.29E-02 2.80E-03 4/3/2023 3.58E-02 2.57E-03 4/5/2023 3.19E-02 2.68E-03 3.15E-02 2.67E-03 3.40E-02 2.74E-03 4.16E-02 2.97E-03 4/10/2023 3.33E-02 2.58E-03 4/13/2023 3.90E-02 2.45E-03 3.68E-02 2.40E-03 3.72E-02 2.41E-03 4.94E-02 2.72E-03 4/17/2023 3.32E-02 2.51E-03 4/20/2023 2.57E-02 2.35E-03 2.62E-02 2.36E-03 2.85E-02 2.42E-03 4.16E-02 2.99E-03 4/24/2023 2.58E-02 2.44E-03 4/27/2023 2.64E-02 2.38E-03 2.24E-02 2.26E-03 2.53E-02 2.38E-03 3.80E-02 2.71E-03 5/1/2023 1.63E-02 2.04E-03 5/4/2023 9.77E-03 1.84E-03 9.17E-03 1.89E-03 1.07E-02 1.96E-03 1.29E-02 1.89E-03 5/8/2023 8.59E-03 1.69E-03 5/11/2023 2.16E-02 2.42E-03 2.03E-02 2.37E-03 2.42E-02 2.50E-03 2.93E-02 2.45E-03 5/15/2023 3.10E-02 2.42E-03 5/18/2023 3.68E-02 2.64E-03 3.20E-02 2.24E-03 3.40E-02 2.55E-03 4.46E-02 2.85E-03 5/22/2023 2.44E-02 2.25E-03 5/25/2023 2.30E-02 2.23E-03 2.06E-02 2.15E-03 2.28E-02 2.24E-03 2.91E-02 2.42E-03 5/30/2023 2.14E-02 1.98E-03 6/1/2023 1.84E-02 2.11E-03 1.70E-02 2.07E-03 1.95E-02 2.14E-03 2.71E-02 2.40E-03

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 47 Table B-5 (cont.)

Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Sample Group I Group II Group III Period 1B 1C 1Z 3A 5H2 (Control)

End Date Activity 2

Activity 2

6/5/2023 2.12E-02 2.52E-03 6/8/2023 2.94E-02 2.44E-03 2.45E-02 2.28E-03 3.02E-02 2.46E-03 3.68E-02 2.49E-03 6/12/2023 2.39E-02 2.24E-03 6/15/2023 2.58E-02 2.36E-03 2.31E-02 2.27E-03 2.58E-02 2.36E-03 3.36E-02 2.59E-03 6/20/2023 2.56E-02 2.14E-03 6/22/2023 2.80E-02 2.40E-03 2.08E-02 2.17E-03 2.67E-02 2.37E-03 3.47E-02 2.61E-03 6/26/2023 1.15E-02 2.06E-03 6/29/2023 2.06E-02 2.09E-03 1.69E-02 1.96E-03 1.99E-02 2.07E-03 2.55E-02 2.26E-03 7/3/2023 2.93E-02 2.50E-03 7/6/2023 3.38E-02 2.58E-03 2.65E-02 2.36E-03 3.52E-02 2.61E-03 4.17E-02 2.78E-03 7/10/2023 3.19E-02 2.54E-03 7/13/2023 3.84E-02 2.75E-03 3.19E-02 2.58E-03 3.99E-02 2.81E-03 5.02E-02 3.07E-03 7/17/2023 3.75E-02 2.68E-03 7/20/2023 4.04E-02 2.73E-03 3.43E-02 2.56E-03 3.60E-02 2.61E-03 4.97E-02 2.97E-03 7/24/2023 3.40E-02 2.59E-03 7/27/2023 3.09E-02 2.46E-03 2.64E-02 2.32E-03 3.18E-02 2.48E-03 3.81E-02 2.66E-03 7/31/2023 3.45E-02 2.54E-03 8/3/2023 3.34E-02 2.54E-03 2.73E-02 2.36E-03 3.25E-02 2.51E-03 4.26E-02 2.79E-03 8/7/2023 2.72E-02 2.36E-03 8/10/2023 3.24E-02 2.53E-03 2.54E-02 2.31E-03 3.17E-02 2.51E-03 3.91E-02 2.82E-03 8/14/2023 3.59E-02 2.64E-03 8/17/2023 3.61E-02 2.61E-03 2.96E-02 2.40E-03 3.87E-02 2.66E-03 4.47E-02 2.85E-03 8/21/2023 2.84E-02 2.41E-03

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 48 Table B-5 (cont.)

Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Sample Group I Group II Group III Period 1B 1C 1Z 3A 5H2 (Control)

End Date Activity 2

Activity 2

8/24/2023 3.54E-02 2.62E-03 2.84E-02 2.30E-03 3.36E-02 2.62E-03 4.11E-02 2.77E-03 8/28/2023 3.34E-02 2.53E-03 8/30/2023 2.98E-02 2.69E-03 2.68E-02 2.48E-03 3.04E-02 2.72E-03 3.90E-02 3.01E-03 9/5/2023 3.07E-02 2.33E-03 9/7/2023 4.55E-02 2.68E-03 4.51E-02 2.63E-03 4.53E-02 2.64E-03 5.52E-02 2.87E-03 9/11/2023 5.59E-02 3.45E-03 9/14/2023 4.16E-02 2.80E-03 3.45E-02 2.76E-03 3.72E-02 2.64E-03 4.90E-02 2.94E-03 9/18/2023 2.82E-02 2.42E-03 9/20/2023 2.99E-02 2.73E-03 2.74E-02 2.67E-03 3.06E-02 2.77E-03 3.59E-02 2.94E-03 9/25/2023 2.08E-02 2.18E-03 9/27/2023 2.06E-02 2.22E-03 1.79E-02 2.14E-03 2.01E-02 2.22E-03 2.35E-02 2.32E-03 10/2/2023 1.85E-02 2.19E-03 10/4/2023 3.79E-02 2.88E-03 2.95E-02 2.46E-03 3.34E-02 2.58E-03 3.87E-02 2.73E-03 10/9/2023 4.01E-02 2.73E-03 10/11/2023 3.70E-02 2.60E-03 3.42E-02 2.54E-03 3.26E-02 2.48E-03 3.19E-02 2.51E-03 10/16/2023 2.74E-02 2.38E-03 10/18/2023 2.04E-02 2.14E-03 2.04E-02 2.19E-03 1.88E-02 2.09E-03 1.93E-02 2.16E-03 10/23/2023 1.60E-02 2.00E-03 10/26/2023 2.73E-02 2.31E-03 2.67E-02 2.24E-03 2.49E-02 2.24E-03 2.73E-02 2.25E-03 10/30/2023 3.18E-02 2.54E-03 11/1/2023 3.77E-02 3.14E-03 3.87E-02 3.17E-03 4.04E-02 3.17E-03 3.70E-02 2.93E-03 11/6/2023 3.62E-02 2.71E-03 11/8/2023 6.40E-02 3.17E-03 6.32E-02 3.33E-03 6.43E-02 3.41E-03 6.46E-02 3.36E-03

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 49 Table B-5 (cont.)

Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Sample Group I Group II Group III Period 1B 1C 1Z 3A 5H2 (Control)

End Date Activity 2

Activity 2

11/13/2023 3.66E-02 2.71E-03 11/15/2023 3.55E-02 2.63E-03 3.33E-02 2.59E-03 3.93E-02 2.73E-03 3.47E-02 2.62E-03 11/20/2023 3.55E-02 2.59E-03 11/21/2023 4.16E-02 3.03E-03 4.07E-02 2.99E-03 4.38E-02 3.09E-03 4.28E-02 3.05E-03 11/27/2023 2.23E-02 2.32E-03 11/29/2023 2.99E-02 2.36E-03 3.04E-02 2.38E-03 3.04E-02 2.38E-03 2.91E-02 2.34E-03 12/4/2023 4.49E-02 2.94E-03 12/7/2023 5.22E-02 2.90E-03 5.36E-02 2.93E-03 5.52E-02 2.96E-03 5.18E-02 2.89E-03 12/11/2023 3.26E-02 2.55E-03 12/13/2023 3.73E-02 3.00E-03 3.59E-02 2.97E-03 4.15E-02 3.11E-03 3.55E-02 2.95E-03 12/19/2023 3.35E-02 2.40E-03 12/20/2023 4.14E-02 2.82E-03 4.05E-02 2.78E-03 4.41E-02 2.89E-03 4.09E-02 2.79E-03 12/27/2023 2.61E-02 2.11E-03 12/28/2023 2.92E-02 2.29E-03 2.92E-02 2.28E-03 3.33E-02 2.41E-03 3.07E-02 2.33E-03

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 50 Table B-6 Concentration of Gamma Emitters in Air Particulates (Results in units of 10-3 pCi/m3 +/- 2)

Group I Group II Group III Stop Date 1B 1C 1Z 3A 5H21 3/27/2023 3/30/2023 6/26/2023 6/29/2023 9/25/2023 9/27/2023 12/27/2023 12/28/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 51 Table B-7 Concentration of Gamma Emitters in Vegetation Samples (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Sample Type Gamma Emitters 1C 6/28/2023 Cabbage 6/28/2023 Kale 6/28/2023 Collards 7/26/2023 Cabbage 7/26/2023 Collards 7/26/2023 Kale 8/22/2023 Kale 8/22/2023 Cabbage 8/22/2023 Collards 9/26/2023 Kale 9/26/2023 Horseradish 9/26/2023 Collards 2Q 6/28/2023 Cabbage 6/28/2023 Squash 6/28/2023 Broccoli 7/26/2023 Cabbage 7/26/2023 Broccoli 7/26/2023 Squash 8/22/2023 Zucchini 8/22/2023 Squash Leaves 8/22/2023 Cabbage 9/26/2023 Broccoli 9/26/2023 Pumpkin Leaves 9/26/2023 Cabbage 3Q 6/28/2023 Broccoli 6/28/2023 Cabbage 6/28/2023 Zucchini 7/26/2023 Cabbage 7/26/2023 Kale 7/26/2023 Cucumber 8/22/2023 Kale 8/22/2023 Zucchini 8/22/2023 Squash Leaves 9/26/2023 Eggplant Leaves 9/26/2023 Cabbage 9/26/2023 Pumpkin Leaves 55 6/28/2023 Cabbage (Control) 6/28/2023 Collards 6/28/2023 Kale 7/26/2023 Cabbage 7/26/2023 Collards 7/26/2023 Kale 8/22/2023 Kale 8/22/2023 Collards 8/22/2023 Swiss Chard 9/26/2023 Beets 9/26/2023 Collards 9/26/2023 Swiss Chard

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 52 Table B-8 Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2)

Sample Code Sample Date Gamma Emitters Farm J 1/10/2023 Biweekly-Monthly 2/14/2023 3/7/2023 3/21/2023 4/5/2023 4/18/2023 5/2/2023 5/16/2023 5/31/2023 6/13/2023 6/27/2023 Farm R 1/10/2023 Biweekly-Monthly 2/14/2023 3/7/2023 3/21/2023 4/5/2023 4/18/2023 5/2/2023 5/16/2023 5/31/2023 6/13/2023 6/27/2023 7/11/2023 7/25/2023 8/8/2023 8/22/2023 9/6/2023 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/14/2023 11/28/2023 12/12/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 53 Table B-8 (cont.)

Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2)

Sample Code Sample Date Gamma Emitters Farm S 1/10/2023 Biweekly-Monthly 2/14/2023 3/7/2023 3/21/2023 4/5/2023 4/18/2023 5/2/2023 5/16/2023 5/31/2023 6/13/2023 6/27/2023 7/11/2023 7/25/2023 8/8/2023 8/22/2023 9/6/2023 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/14/2023 11/28/2023 12/12/2023 Farm V 1 1/9/2023 Biweekly-Monthly 2/14/2023 3/7/2023 3/21/2023 4/5/2023 4/18/2023 5/2/2023 5/16/2023 5/31/2023 6/13/2023 6/27/2023 7/11/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 54 Table B-8 (cont.)

Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2)

Sample Code Sample Date Gamma Emitters Farm V 1 7/25/2023 Biweekly-Monthly 8/8/2023 8/22/2023 9/6/2023 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/15/2023 11/27/2023 12/12/2023 Farm X 1/10/2023 Biweekly-Monthly 2/14/2023 3/7/2023 3/21/2023 4/5/2023 4/18/2023 5/2/2023 5/16/2023 5/31/2023 6/13/2023 6/27/2023 7/11/2023 7/25/2023 8/8/2023 8/22/2023 9/6/2023 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/14/2023 11/28/2023 12/12/2023 Farm P 2/14/2023 Biweekly-Monthly 5/2/2023 8/8/2023 8/22/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 55 Table B-8 (cont.)

Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2)

Sample Code Sample Date Gamma Emitters Farm P 9/6/2023 Biweekly-Monthly 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/14/2023 11/28/2023 12/12/2023 Farm M-1C 8/8/2023 Biweekly-Monthly 8/22/2023 9/6/2023 9/19/2023 10/3/2023 10/16/2023 10/31/2023 11/14/2023 11/29/2023 12/12/2023 Farm C Quarterly 1 2/14/2023 Farm W Quarterly 5/2/2023 8/8/2023 11/14/2023 Farm E Quarterly 1 2/14/2023 5/3/2023 8/8/2023 11/14/2023 Farm D Quarterly 2/14/2023 5/2/2023 8/8/2023 11/14/2023 Farm Y Quarterly 2/14/2023 5/3/2023 8/9/2023 11/14/2023 Farm M-15G Quarterly 8/8/2023 11/14/2023 1 Control Location

All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 56 Table B-9 Typical MDA Ranges for Gamma Spectrometry Selected Nuclides Air Particulates (10-3 pCi/m3)

Surface

Water, Drinking Water (pCi/L)

Fish (pCi/kg) Wet Ground water (pCi/L)

Milk (pCi/L)

Oysters (pCi/kg)

Shoreline Sediment (pCi/kg) Dry Soil (pCi/kg)

Dry Vegetation (pCi/kg) Wet K-40 5.65 - 24.6 16 - 182 2,747 - 4,505 21.5 -66.4 1,286 - 1,529 1,269 - 2,069 781 - 13,761 789 - 10,713 1980-5174 Mn-54 0.32 - 1.16 2.7 - 5.6 9.8 - 19.6 2.86 - 5.14 3.6 - 6.6 10.8 - 16.4 41.4 - 67.1 37.4 - 91.9 11.8-26.3 Fe-59 1.01 - 8.52 5.6 - 13.2 31.6 - 93.2 6.04 - 11.7 9.2 - 15.9 29.3 - 56.7 142 - 251 96.4 - 389 28.2-61.3 Co-58 0.38 - 2.07 2.7 - 5.6 10.9 - 28.3 2.86 - 5.27 3.7 - 6.3 10.5 - 19.3 53.7 - 82.9 44.6 - 133 11.6-26.3 Co-60 0.28 - 1.09 2.8 - 5.5 10.9 - 24.3 3.01 - 5.38 4.1 - 7.2 11.7 - 17.0 38.6 - 57.9 32.8 - 85.8 13.5-32.2 Zn-65 0.81 - 3.10 5.5 - 11.4 23.3 - 57.2 6.41 - 14.4 9.4 - 16.1 22.0 - 43.3 112 - 198 96.4 - 275 29.3-60.1 Ag-110m 0.33 - 1.06 2.42 - 4.96 8.2 - 18.1 2.79 - 5.06 3.26-5.64 8.7 - 16.0 36.6 - 175 40.7 - 99.4 11-23.6 Zr-95 0.72 - 3.88 4.7 - 10.2 20.0 - 47.1 5.62 - 8.75 5.8 - 11.5 19.0 - 34.0 93.5 - 151 84.6 - 261 21.5-44.2 Nb-95 0.56 - 4.91 2.9 - 6.0 13.7 - 42.7 3.3 - 5.88 3.9 - 6.5 13.9 - 24.3 82.1 - 157 61.5 - 227 13-26.9 Ru-106 3.00 - 12.1 23.8 - 48.1 77.1 - 197 25.6 - 45.3 29.3 - 51.8 88.0 - 141 327.0 - 570 314.0 - 840 105-227 I-1311 2.73 - 914 0.52 - 11.7 21.4 - 2,340 4.87 - 9.04 0.5 - 7.03 22.4 - 107 470 - 2,040 139 - 8,060 15.1-35.7 Cs-134 0.47 - 0.88 3.2 - 5.7 7.8 - 16.0 2.92 - 5.48 4.09 - 4.82 9.7 - 16.5 43.3 - 82.4 33.4 - 109 11.4-23.8 Cs-137 0.46 - 0.88 3.7 - 5.9 3.8 - 17.5 2.97 - 5.43 4.08 - 5.29 10.0 - 16.7 38.4 - 65.4 39.1 - 135 13.1-30.8 La-140 2.01 - 116 5.05 - 11.5 15.9 - 444 4.87 - 10.3 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 12.6-39 Ba-140 2.01 - 116 5.05 - 11.5 15.9 - 444 5.86 - 26.0 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 17.5-105 Ce-144 1.12 - 3.27 16.8 - 36.7 38.1 - 70.9 17.8 - 32.0 20.5 - 31.0 42.6 - 72.6 208 - 279 191 - 414 71.5-132 Cr-51 4.90 - 45.0 23.2 - 50.6 93.0 - 395 26.7 - 42.1 30.4 - 46.8 97.0 - 199 711 - 1,110 489 - 1,810 104-196 Na-22 0.34 - 1.33 2.7 - 6.0 12.1 - 28.0 2.78 - 5.94 4.9 - 8.5 13.4 - 19.5 46.4 - 77.4 36.4 - 92.4 4.4-56.6 1 This MDA range for I-131 on a charcoal cartridge is typically 5.22 x 10-3 to 1.37 x 10-2 pCi/m3

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 57 Table B-10 Typical LLDs for Gamma Spectrometry Selected Nuclides Air Particulates 10-3 pCi/m3 Surface Water, Drinking Water pCi/L Fish pCi/kg (wet)

Ground water pCi/L Oysters pCi/kg (wet)

Milk pCi/L Soil pCi/kg (dry)

Vegetation pCi/kg (wet)

Na-22 5

5.3 12 5.3 12 9.1 78 27 Cr-51 74 37 76 37 76 62 452 185 Mn-54 4.6 4.7 13 4.7 13 7.4 63 20 Co-58 6.7 4.3 12 4.3 12 8.2 78 31 Fe-59 20 11 27 11 27 18 123 73 Co-60 3.5 4.8 12 4.8 12 7.5 59 37 Zn-65 8.9 11 27 11 27 17 162 57 Nb-95 9.8 4.5 13 4.5 13 9.5 73 24 Zr-95 11 7.9 18 7.9 18 14 117 40 Ru-106 43 38 111 38 111 62 624 178 Ag-110m 4.2 4.3 11 4.3 11 6

65 24 Te-129m 101 56 118 56 118 90 833 370 I-131*

90 0.8 11 6.4 11 0.8 58 42 Cs-134 4.7 4.7 11 4.7 11 6.7 66 17 Cs-137 4.2 5.1 11 5.1 11 6.9 78 26 Ba-140 47 23 39 23 39 46 103 143 La-140 47 9.2 15 9.2 15 13 103 43 Ce-144 15 23 45 23 45 37 288 114

The LLD for I-131 measured on a Charcoal cartridge is 3.7 x10-2 pCi/m3

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 58 Table B-11 Quarterly DLR Results for Peach Bottom Atomic Power Station 2023 (Results in Units of mrem/91 days)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 59 Table B-12 Annual DLR Results for Peach Bottom Atomic Power Station 2023 (Results in Units of mrem/year)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 60 APPENDIX C Quality Assurance Program Appendix C is a summary of Constellation Generation Solutions (CGS) laboratorys quality assurance program. It consists of Table C-1 which is a compilation of the results of the CGS laboratorys participation in an interlaboratory comparison program with Environmental Resource Associates (ERA) located in Arvada, Colorado and Eckert and Ziegler Analytics, Inc. (EZA) located in Atlanta, Georgia.

It also includes Table C-2, which is a compilation of the results of the Constellation Generation Solutions (CGS) Laboratorys participation in a split sample program with Teledyne Brown Engineering located in Knoxville, Tennessee, and Table C-3, which is a list of the Site Specific LLDs required by the ODCM.

The CGS laboratory's results contained in Table C-1, interlaboratory comparison results, are in full agreement when they were evaluated using the NRC Resolution Test Criteria

[1] except as noted in the Pass/Fail column and described below. The CGS laboratory's results are provided with their analytical uncertainties of two sigma. When evaluating with the NRC Resolution Test a one sigma uncertainty is used to determine Pass or Fail and noted accordingly.

All results reported passed their respective vendor acceptance ranges and NRC Resolution Test Criteria [1] with one exception for the Water Study ERA RAD 133, reference date 4/10/2023. The CGS lab reported a result of 26.6pCi/L for Ba-133 which passed the NRC Resolution Test Criteria but failed the Vendor Acceptance Range of 17.1-25.8 pCi/L. This high result is for a low concentration of an isotope with low statistics that historically is observed at the lower end of acceptable data ranges. In this case however, the result was an outlier and should have been flagged out of trend and not passed internal QA review. This event has been entered into the Corrective Action Program for tracking and to prevent future occurrence.

The vendor laboratories used by CGS for subcontracting and interlaboratory comparison samples, GEL Laboratories and Teledyne Brown Engineering, also participate in the ERA and EZA interlaboratory comparison program. A presentation of their full data report is provided in their Annual Environmental Quality Assurance Program Reports, (Ref 16,17). In summary Gel and TBE reported results met vendor and laboratory acceptance ranges with the following exceptions discussed here:

For the TBE laboratory, 110 out of 115 analyses performed met the specified acceptance criteria. Five analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:

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

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 61

2. The ERA RAD October 2023 water Gross Alpha result was evaluated as Not Acceptable. The reported result was 53.2 pCi/L and the known result was 70.6 (acceptable range of 54.0 - 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75% of the known value (within TBE QC range). The original result was 63.3 pCi/L (90% of the known). Because the LCS result was biased slightly high, the decision was made to report the lower value. (NCR 23-20)

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

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

(NCR 23-09)

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

The last failure (high) was in 2016. (NCR 23-24)

For the GEL Laboratory, nine analyses from four performance evaluation studies did not meet the specified acceptance criteria and were addressed through the GELs internal nonconformance system. A summary is found below:

1. RAD-132 Water failed three parameters. All data and laboratory processes were evaluated and no errors were found. The investigation determined that the laboratory met all quality control criteria specified in the methods and failures were tracked through GEL's internal nonconformance system.

Zinc-65 was reported at 126pCi/L with a Reference Value of 105pCi/L and acceptance range of (94.5 - 125 pCi/l). The unacceptable error is due to an un known error.

Tritium was reported at 18,000pCi/L with a Reference Value of 21,600pCi/L and acceptance range of (18,900-23,800pCi/L). The laboratory has concluded

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 62 that this low bias was an isolated occurrence and that the overall process is within control.

Iodine-131 was reported at 16.8pCi/L with a Reference Value of 27pCi/L and acceptance range of (22.4 - 31.8 pCi/l). Having found no errors, the laboratory continues to investigate all steps of the analytical process including the standardization of the carrier reagent as a possible contributor to the low bias.

2. E13890 Milk failed Strontium-90. All data and laboratory processes were evaluated, and no errors were found. The investigation determined that the laboratory met all quality control criteria specified in the method and failures were tracked through GEL's internal nonconformance system. Strontium-90 was reported at 6.21pCi/L with a Reference Value of 12.7pCi/L and acceptance range of (7.62 - 15.88 pCi/l). The laboratory reviewed the data for this analysis and no errors were found. It was noted that both the Strontium and Yttrium carriers recovered greater than is typically seen for this method which could cause a potential low bias in the results. Due to the Sr-89 result being with acceptance limits, it is also suspected that an undetermined error occurred during the second separation resulting in a low Y-90 recovery.

3. RAD-134 Water failed three parameters. The investigation determined that the laboratory met all quality control criteria specified in the method. Additionally, all internal procedures and policies were performed as required. These failures were tracked through GELs internal non-conformance system.

Barium-133 was reported at 75.7pCi/L with a Reference Value of 66pCi/L and acceptance range of (55.4 - 73.2 pCi/l). The data was reviewed and no errors were found. The result recovered at 114% of the reference value which is within the laboratory's acceptance criteria for LCS recovery. The batch Duplicate result was within the acceptance range of the study and met batch replication criteria with the sample result. Historical performance evaluation results do not indicate a high bias for this parameter. Additionally, a contributing factor is how long the samples were counted. The laboratorys SOP indicates drinking water samples are typically counted for 4 hrs. This results in an uncertainty associated with the result that approaches the acceptable range.

Strontium 89 was reported at 61.8pCi/L and 59.6pCi/l with a Reference Value of 51.2pCi/L and acceptance range of (40.4 - 58.7pCi/l). Strontium-90 was reported at 58.2pCi/L with a Reference Value of 45.0pCi/L and acceptance range of (33.2 - 51.6pCi/L). The data for the drinking water PT analysis has been reviewed and no anomalies were noted. The Strontium-89 result recovered at 118% (905.0 Mod) and 116% (905.0) which is within the laboratorys acceptance criteria for LCS recovery. The sample was analyzed in duplicate for each method, and the duplicate results were within the acceptance range of the study. While the Stontium-90 LCS for the batch met recovery requirements, the recovery was higher than is typically recovered for these methods. The two gravimetrical yields that are determined in the drinking water method were reviewed. It was noted that the yields were closer

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 63 to the lower end of the acceptance range. It is possible that the yield recoveries contributed to bias in the results. For the failed Strontium-90, it was noted also that the first prep of the sample needed to be reanalyzed due to low yields. A smaller sample volume was used in the reanalysis, and this may have contributed to variation in the results and greater uncertainty in the measurement.

Iodine-131 was reported at 29.1pCi/L with a Reference Value of 24.4pCi/L and acceptance range of (20.2 - 28.9 pCi/l). The data for the drinking water PT analysis has been reviewed and no anomalies were noted. The laboratory has reviewed the data for this analysis and no errors were found. The result recovered at 119% of the reference value which is within the laboratorys acceptance criteria for LCS recovery. The Duplicate in the analysis batch was within the acceptance range of the study and met replication criteria with the sample result. Review of historical results for I-131 performance evaluation samples by this method does not indicate a high bias.

4. MRAD-39 Soil failed two parameters. The investigation determined that the laboratory met all quality control criteria specified in the method. Additionally, all internal procedures and policies were performed as required. These failures were tracked through GELs internal nonconformance system.

Cesium-137 was reported at 1290pCi/Kg with a Reference Value of 1780pCi/Kg and acceptance range of (1350 - 2250pCi/Kg).

Cobalt-60 was reported at 5760 pCi/Kg with a Reference Value of 7960pCi/Kg and acceptance range of (6270 - 9830 pCi/Kg).

The Interlaboratory results contained in Table C-2 are intercomparison results for routine samples split for analyses between CGS and its subcontractor, GEL, as the primary REMP Laboratory and TBE as the QA laboratory. Analysis evaluated were Tritium, Strontium 90, Beta and non-natural gamma emitters. The CGS laboratorys results are provided with their analytical uncertainties of 2 sigma. When evaluating with the NRC Resolution Test a one sigma uncertainty is used to determine Pass or Fail and noted accordingly. In the event there are no non-natural isotopes detected, the samples are reported <MDA and designated as Pass.

The results contained in Table C-2 generally agree with their respective CGS laboratory original, and Teledyne Brown Engineerings split laboratory sample according to NRC Resolution Test Criteria1. The results for separate air samplers collocated E1-2 and E1-2Q analyzed by CGS and TBE respectively for Air Iodine and the Beta particulate are generally in trend. Instances where the split data does not meet NRC Resolutions test Criteria are for Gross Beta analysis and likely because the CGS laboratory counts samples generally an order of magnitude below required MDAs thus achieving very low uncertainties which results in a very tight range of acceptance when comparing to TBEs results that are counted to meet required MDAs resulting in greater uncertainty in the data.

[1] NRC Inspection Manual, Inspection Procedure 84750, March 15, 1994

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 64 Table C-1 Results of Participation in Cross Check Programs Reference Date Standard Media Type Analysis Type Units Nuclide Reported Value Assigned Value NRC Resolution Test Pass / Fail 3/16/2023 E13841 Cartridge Gamma pCi I-131 84.0 90.1 Pass 3/16/2023 E13841 Cartridge Gamma pCi I-131 88.6 90.1 Pass 3/16/2023 E13841 Cartridge Gamma pCi I-131 86.6 90.1 Pass 3/16/2023 E13841 Cartridge Gamma pCi I-131 83.2 90.1 Pass 3/16/2023 E13840 Water Beta pCi/L Cs137 228 229 Pass 3/16/2023 E13839 Milk Gamma pCi/L I-131 69.1 82.0 Pass Cs-134 177 200 Pass Cs-137 133 140 Pass Ce-141 150 139 Pass Cr-51 307 302 Pass Mn-54 172 180 Pass Co-58 125 131 Pass Fe-59 118 122 Pass Co-60 267 279 Pass Zn-65 284 306 Pass 3/16/2023 E13839 Milk Gamma pCi/L I-131 71.7 82.0 Pass Cs-134 179 200 Pass Cs-137 138 140 Pass Ce-141 143 139 Pass Cr-51 272 302 Pass Mn-54 184 180 Pass Co-58 126 131 Pass Fe-59 116 122 Pass Co-60 258 279 Pass Zn-65 276 306 Pass 4/10/2023 Rad-133 Water Gamma pCi/L Ba-133 26.3 22.3 Fail 1 Cs-134 75.6 77.6 Pass Cs-137 61.0 61.0 Pass Co-60 31.8 30.3 Pass Zn-65 230 242 Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 65 Table C-1 (cont.)

Results of Participation in Cross Check Programs Reference Date Standard Media Type Analysis Type Units Nuclide Reported Value Assigned Value NRC Resolution Test Pass / Fail 4/10/2023 Rad-133 Water Beta pCi/L Cs-137 50.7 60.7 Pass 4/10/2023 Rad-133 Water Gamma pCi/L I-131 28.1 28.7 Pass 6/15/2023 E13771 Soil Gamma pCi/g Cs-134 0.285 0.292 Pass Cs-137 0.423 0.441 Pass 6/15/2023 E13771 Soil Gamma pCi/g Cs-134 0.320 0.292 Pass Cs-137 0.490 0.441 Pass 6/15/2023 E13842 Water Beta pCi/L Cs-137 205 205 Pass 6/15/2023 E13843 Water Gamma pCi/L Ce-141 91.0 82.5 Pass Co-58 102 94.7 Pass Co-60 237 252 Pass Cr-51 175 201 Pass Cs-134 121 126 Pass Cs-137 162 158 Pass Fe-59 127 118 Pass Mn-54 113 112 Pass Zn-65 152 170 Pass 6/15/2023 E13843 Water Gamma pCi/L Ce-141 93.8 82.5 Pass Co-58 92.9 94.7 Pass Co-60 267 252 Pass Cr-51 237 201 Pass Cs-134 118 126 Pass 6/15/2023 E13843 Water Gamma pCi/L Cs-137 160 158 Pass Fe-59 138 118 Pass Mn-54 119 112 Pass Zn-65 161 170 Pass 6/15/2023 E13844 Filter Gamma pCi Ce-141 77.0 76.7 Pass Co-58 84.8 88.1 Pass Co-60 227 235 Pass Cr-51 184 187 Pass Cs-134 97.3 117 Pass Cs-137 139 147 Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 66 Table C-1 (cont.)

Results of Participation in Cross Check Programs Reference Date Standard Media Type Analysis Type Units Nuclide Reported Value Assigned Value NRC Resolution Test Pass / Fail 6/15/2023 E13844 Filter Gamma pCi Fe-59 129 110 Pass Mn-54 111 104 Pass Zn-65 171 159 Pass 6/15/2023 E13844 Filter Gamma pCi Ce-141 80.3 76.7 Pass Co-58 83.9 88.1 Pass Co-60 237 235 Pass Cr-51 180 187 Pass Cs-134 101 117 Pass Cs-137 147 147 Pass Fe-59 131 110 Pass Mn-54 113 104 Pass Zn-65 167 159 Pass 6/15/2023 E13845 Filter Beta pCi Cs-137 201 185 Pass 9/14/2023 E13846 Filter Beta pCi Cs-137 260 237 Pass 9/14/2023 E13772 Soil Gamma pCi/g Cs-134 0.221 0.202 Pass Cs-137 0.326 0.315 Pass 9/14/2023 E13772 Soil Gamma pCi/g Cs-134 0.213 0.202 Pass Cs-137 0.268 0.315 Pass 9/18/2023 MRAD-39 Filter Gamma pCi Cs-134 1188 1350 Pass Cs-137 1010 932 Pass Co-60 113 95.5 Pass Zn-65 175 161 Pass 10/6/2023 RAD-135 Water Gamma pCi/L Cs-134 43.3 41.2 Pass Cs-137 215 199 Pass Co-60 48.1 47.8 Pass Zn-65 62.1 57.0 Pass 10/6/2023 RAD-135 Water Gamma pCi/L I-131 28.9 29.7 Pass 10/6/2023 RAD-135 Water Gamma pCi/L I-131 28.3 29.7 Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 67 Table C-1 (cont.)

Results of Participation in Cross Check Programs Reference Date Standard Media Type Analysis Type Units Nuclide Reported Value Assigned Value NRC Resolution Test Pass / Fail 11/30/2023 E13847 Filter Gamma pCi Cs-134 161 189 Pass Cs-137 156 160 Pass Ce-141 119 117 Pass Cr-51 176 201 Pass Mn-54 138 130 Pass Fe-59 163 142 Pass Co-60 123 123 Pass Zn-65 163 168 Pass 11/30/2023 E13847 Filter Gamma pCi Cs-134 163 189 Pass Cs-137 163 160 Pass Ce-141 119 117 Pass Cr-51 179 201 Pass Mn-54 134 130 Pass Fe-59 169 142 Pass Co-60 122 123 Pass 11/30/2023 E13847 Filter Gamma pCi Zn-65 174 168 Pass 11/30/2023 E13848 Water Beta pCi/L Cs-137 229 189 Pass 11/30/2023 E13849 Cartridge Gamma pCi I-131 72.9 79.9 Pass 11/30/2023 E13849 Cartridge Gamma pCi I-131 72.1 79.9 Pass 11/30/2023 E13849 Cartridge Gamma pCi I-131 73.3 79.9 Pass 11/30/2023 E13850 Milk Gamma pCi/L I-131 38.4 40.0 Pass Cs-134 129 143 Pass Cs-137 123 121 Pass Ce-141 88.5 88.7 Pass Cr-51 155 152 Pass Mn-54 99.8 98.3 Pass Fe-59 107 108 Pass Co-60 94.3 92.9 Pass Zn-65 121 127 Pass 11/30/2023 E13850 Milk Gamma pCi/L I-131 32.2 40.0 Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 68 Table C-1 (cont.)

Results of Participation in Cross Check Programs Reference Date Standard Media Type Analysis Type Units Nuclide Reported Value Assigned Value NRC Resolution Test Pass / Fail Cs-134 138 143 Pass Cs-137 116 121 Pass 11/30/2023 E13850 Milk Gamma pCi/L Ce-141 79.1 88.7 Pass Cr-51 146 152 Pass Mn-54 103 98.3 Pass Fe-59 119 108 Pass Co-60 95.5 92.9 Pass Zn-65 113 127 Pass 1 See Quality Assurance Program Discussion

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 69 Table C-2 Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Milk Farm V 2/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm V 2/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm S 2/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm S 2/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm J 2/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm J 2/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm V 05/02/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm V 05/02/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm S 05/02/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm S 05/02/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm J 05/02/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm J 05/02/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm V 08/08/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm V 08/08/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm S 08/08/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm S 08/08/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm R 08/08/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm R 08/08/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm V 11/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm V 11/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm S 11/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk Farm S 11/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk Farm R 11/14/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 70 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Milk Farm R 11/14/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 2/2/2023 Gross Beta pCi/L 1.8 +/- 0.7

<1.9 Pass Water 4L 2/2/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 2/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 3/2/2023 Gross Beta pCi/L 2.4 +/- 0.7

<2.2 Pass Water 4L 3/2/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 3/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 3/30/23 Gross Beta pCi/L 2.1 +/- 0.8

<1.9 Pass Water 4L 3/30/23 LLI pCi/L

<MDA

<MDA Pass Water 4L 3/30/23 Gamma pCi/L

<MDA

<MDA Pass Water 4L 3/30/23 Tritium pCi/L

<MDA

<MDA Pass Water 4L 4/27/2023 Gross Beta pCi/L 2.4 +/- 0.7

<1.9 Pass Water 4L 4/27/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 4/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 6/1/2023 Gross Beta pCi/L 2.1 +/- 0.8 1.9 +/- 1.2 Pass Water 4L 6/1/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 6/1/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 6/29/2023 Gross Beta pCi/L 1.2 +/- 0.7

<2.3 Pass Water 4L 6/29/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 6/29/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 6/29/2023 Tritium pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 71 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Water 4L 7/27/2023 Gross Beta pCi/L 1.5 +/- 0.7 2.8 +/- 1.6 Pass Water 4L 7/27/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 7/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 8/30/2023 Gross Beta pCi/L 1.4 +/- 0.7

<2.1 Pass Water 4L 8/30/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 8/30/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 9/27/2023 Gross Beta pCi/L 1.6 +/- 0.7

<2.3 Pass Water 4L 9/27/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 9/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 9/27/2023 Tritium pCi/L

<MDA

<MDA Pass Water 4L 11/1/2023 Gross Beta pCi/L 2.6 +/- 0.8

<2.0 Pass Water 4L 11/1/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 11/1/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 11/29/2023 Gross Beta pCi/L 2.9 +/- 0.8

<1.9 Pass Water 4L 11/29/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 11/29/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 12/28/2023 Gross Beta pCi/L 2.4 +/- 0.8 2.9 +/- 1.5 Pass Water 4L 12/28/2023 LLI pCi/L

<MDA

<MDA Pass Water 4L 12/28/2023 Gamma pCi/L

<MDA

<MDA Pass Water 4L 12/28/2023 Tritium pCi/L

<MDA

<MDA Pass Vegetation IB10 6/19/2023 Gamma pCi/kg

<MDA

<MDA Pass Vegetation 31G1 6/13/2023 Gamma pCi/kg

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 72 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Fish (Mud Flapper)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Bowfin)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Carp)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Bottom Feeder)

PB-6 6/12/2023 Gamma pCi/kg

<MDA

<MDA Pass Bottom Sediment CC-WBS4 6/28/2023 Gamma pCi/kg

<MDA

<MDA Pass Bottom Sediment CC-WBS2 6/28/2023 Gamma pCi/kg

<MDA

<MDA Pass Oysters CC-IA3 8/23/2023 Gamma pCi/kg

<MDA

<MDA Pass Oysters CC-IA6 8/23/2023 Gamma pCi/kg

<MDA

<MDA Pass Bay Water CC-WA1 8/29/2023 Gamma pCi/L

<MDA

<MDA Pass Bay Water CC-WA2 8/29/2023 Gamma pCi/L

<MDA

<MDA Pass Filter Composite CC-A3 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-A4 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-A5 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA1 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA2 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA3 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 73 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Filter Composite CC-SFA4 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Gross Beta pCi/L 1.4 +/- 0.7

<1.96 Pass Water -

Q9-1 2/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Gross Beta pCi/L 1.7 +/- 0.7

<2.09 Pass Water -

Q9-1 3/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Gross Beta pCi/L 1.2 +/- 0.7

<2.03 Pass Water -

Q9-1 3/30/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Gross Beta pCi/L 1.1 +/- 0.6

<1.89 Pass Water -

Q9-1 4/26/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/1/2023 Gross Beta pCi/L 2.8 +/- 0.7 2.3 +/- 1.4 Pass Water -

Q9-1 6/1/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/1/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/1/2023 Tritium pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 74 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Water -

Q9-1 6/29/2023 Gross Beta pCi/L 1.6 +/- 0.8

<2.39 Pass Water -

Q9-1 6/29/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/29/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/29/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Gross Beta pCi/L 2.0 +/- 0.7 2.9 +/- 1.6 Pass Water -

Q9-1 7/27/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Gross Beta pCi/L 2.0 +/- 0.7 2.8 +/-1.5 Pass Water -

Q9-1 8/31/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Gross Beta pCi/L 2.1 +/- 0.8

<2.13 Pass Water -

Q9-1 10/3/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Gross Beta pCi/L 2.1 +/- 0.7 3.1 +/- 1.3 Pass Water -

Q9-1 11/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/9/2023 Gross Beta pCi/L 1.4 +/- 0.7

<2.05 Pass Water -

Q9-1 12/9/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 75 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Water -

Q9-1 12/9/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/9/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Gross Beta pCi/L 1.6 +/- 0.8 2.2 +/- 1.5 Pass Water -

Q9-1 12/28/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Tritium pCi/L

<MDA

<MDA Pass Milk-G2-1 1/11/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 1/11/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 2/15/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 2/15/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/8/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 3/8/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 4/6/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 4/6/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 4/20/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 4/20/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 5/3/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/3/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 76 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Milk-G2-1 5/17/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/17/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 5/31/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/31/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 6/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 6/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 7/12/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 7/12/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 7/26/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 7/26/2023 LLI pCi/L

<MDA

<MDA Pass Pass Milk-G2-1 8/9/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 8/9/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 8/23/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 8/23/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 9/6/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 9/6/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 77 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Milk-G2-1 9/20/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 9/20/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 10/4/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 10/4/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 10/18/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 10/18/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 11/1/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/1/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 11/15/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/15/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 11/29/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/29/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 12/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 12/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Strontium 89 pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Strontium 89 pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Milk-G2-1 9/21/2023 Strontium 89 pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 78 Table C-2 (cont.)

Results of the CGS Quality Assurance Split Sample Program Sample Type and Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Milk-G2-1 9/21/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Filter E1-2 3/30/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 6/29/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 9/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 12/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Vegetation H1-2 6/14/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 7/12/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 9/20/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 6/14/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 7/12/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 9/20/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation B10-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Fish INDP 10/4/2023 Gamma pCi/Kg

<MDA

<MDA Pass Fish INDP 10/4/2023 Strontium 90 pCi/Kg

<MDA

<MDA Pass Filter 1Z / 1A 3/30/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 1Z / 1A 6/29/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 1Z / 1A 9/27/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 1Z / 1A 12/28/2023 Gamma pCi/m3

<MDA

<MDA Pass 1 See discussion at the beginning of the Appendix.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 79 Table C-2a Results of Quality Assurance Program Co-Located Air Samplers 1Z and 1A Concentration of Iodine-131 in Filtered Air (Results in units of pCi/m3 +/- 2)

Date Media - Analysis 1Z (CGS Lab) 1 1A (QC TBE Lab) 1 1/5/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/12/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/19/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/26/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/2/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/9/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/16/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/23/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/2/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/9/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/16/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/23/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/30/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/5/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/13/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/27/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/04/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/11/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/18/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/25/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/1/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/8/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/15/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/22/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/29/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/6/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/13/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/27/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1 See Appendix C Summary Discussion

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 80 Table C-2a (cont.)

Results of Quality Assurance Program Co-Located Air Samplers 1Z and 1A Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Date Media - Analysis 1Z (CGS Lab) 1 1A (QC TBE Lab) 1 8/3/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/10/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/17/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/24/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/30/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/7/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/14/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/27/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/4/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/11/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/18/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/26/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/1/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/8/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/15/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/21/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/29/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/7/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/13/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/28/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1 See Appendix C Summary Discussion

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 81 Stop Date Media Analysis 1Z (CGS) 1 1A (TBE) 1 Activity 2 Error Activity 2 Error 1/5/2023 Filter Beta pCi/m3 4.10 0.27 2.70 0.45 1/12/2023 Filter Beta pCi/m3 4.06 0.27 2.54 0.44 1/19/2023 Filter Beta pCi/m3 2.46 0.22 1.72 0.41 1/26/2023 Filter Beta pCi/m3 1.69 0.20 1.51 0.41 2/2/2023 Filter Beta pCi/m3 3.50 0.26 2.31 0.44 2/9/2023 Filter Beta pCi/m3 4.24 0.28 3.41 0.48 2/16/2023 Filter Beta pCi/m3 3.50 0.26 2.74 0.51 2/23/2023 Filter Beta pCi/m3 3.04 0.24 1.91 0.48 3/2/2023 Filter Beta pCi/m3 2.48 0.22 1.81 0.40 3/9/2023 Filter Beta pCi/m3 2.62 0.23 1.90 0.40 3/16/2023 Filter Beta pCi/m3 1.82 0.20 1.30 0.35 3/23/2023 Filter Beta pCi/m3 3.48 0.25 2.36 0.43 3/30/2023 Filter Beta pCi/m3 3.42 0.26 2.55 0.45 4/5/2023 Filter Beta pCi/m3 3.40 0.27 1.75 0.49 4/13/2023 Filter Beta pCi/m3 3.72 0.24 2.82 0.41 4/20/2023 Filter Beta pCi/m3 2.85 0.24 1.73 0.41 4/27/2023 Filter Beta pCi/m3 2.53 0.24 1.85 0.40 5/11/2023 Filter Beta pCi/m3 2.42 0.25 1.28 0.40 5/18/2023 Filter Beta pCi/m3 3.40 0.26 2.41 0.47 5/25/2023 Filter Beta pCi/m3 2.28 0.22 1.73 0.43 6/1/2023 Filter Beta pCi/m3 1.95 0.21 1.26 0.39 6/8/2023 Filter Beta pCi/m3 3.02 0.25 2.19 0.44 6/15/2023 Filter Beta pCi/m3 2.58 0.24 1.66 0.42 6/22/2023 Filter Beta pCi/m3 2.67 0.24 1.92 0.45 6/29/2023 Filter Beta pCi/m3 1.99 0.21 1.66 0.42 7/6/2023 Filter Beta pCi/m3 3.52 0.26 2.54 0.48 7/13/2023 Filter Beta pCi/m3 3.99 0.28 3.29 0.53 7/20/2023 Filter Beta pCi/m3 3.60 0.26 2.62 0.49 7/27/2023 Filter Beta pCi/m3 3.18 0.25 2.22 0.47 8/3/2023 Filter Beta pCi/m3 3.25 0.25 2.30 0.45 8/10/2023 Filter Beta pCi/m3 3.17 0.25 2.43 0.47 8/17/2023 Filter Beta pCi/m3 3.87 0.27 2.11 0.46 8/24/2023 Filter Beta pCi/m3 3.36 0.26 2.57 0.47 8/30/2023 Filter Beta pCi/m3 3.04 0.27 2.49 0.53 9/7/2023 Filter Beta pCi/m3 4.53 0.26 2.82 0.46 9/14/2023 Filter Beta pCi/m3 3.72 0.26 2.62 0.50 9/20/2023 Filter Beta pCi/m3 3.06 0.28 1.81 0.48 9/27/2023 Filter Beta pCi/m3 2.01 0.22 1.74 0.42 10/4/2023 Filter Beta pCi/m3 3.34 0.26 2.03 0.47 10/11/2023 Filter Beta pCi/m3 3.26 0.25 2.48 0.46 10/18/2023 Filter Beta pCi/m3 1.88 0.21 1.88 0.42 10/26/2023 Filter Beta pCi/m3 2.49 0.22 2.06 0.44 11/1/2023 Filter Beta pCi/m3 4.04 0.32 3.17 0.56 11/8/2023 Filter Beta pCi/m3 6.43 0.34 4.02 0.58 11/15/2023 Filter Beta pCi/m3 3.93 0.27 3.01 0.47 11/21/2023 Filter Beta pCi/m3 4.38 0.31 3.10 0.55 11/29/2023 Filter Beta pCi/m3 3.04 0.24 2.15 0.41 12/7/2023 Filter Beta pCi/m3 5.52 0.30 2.86 0.46 12/13/2023 Filter Beta pCi/m3 4.15 0.31 2.02 0.49 12/20/2023 Filter Beta pCi/m3 4.41 0.29 2.47 0.49 12/28/2023 Filter Beta pCi/m3 3.33 0.24 1.96 0.42 1 See Appendix C Summary Discussion Table C-2b Results of Quality Assurance Program Co-Located Air Samplers 1Z and 1A Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 82 TABLE C-3 Peach Bottom Atomic Power Station ODCM Required LLDs Selected Water Fish/Shellfish Milk Sediment Vegetation Particulates Nuclides pCi/l pCi/kg pCi/L pCi/kg pCi/kg pCi/m3 Gross Beta 4

0.01 H-3 2000 Mn-54 15 130 Co-58 15 130 Fe-59 30 260 Co-60 15 130 Zn-65 30 260 Zr-95 30 Nb-95 15 I-131 1

60 0.071 Cs-134 15 130 15 150 60 0.05 Cs-137 18 150 18 180 80 0.06 Ba-140 60 60 La-140 15 15 1 Air samples for I-131 are collected separately on a charcoal radioiodine cannister.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 83 APPENDIX D Land Use Survey Appendix D contains the results of a Land Use Survey conducted in the fall of 2023 around PBAPS performed by Constellation Generation Solutions to comply with Section 3.8.E.2 of PBAPS ODCM Specifications. The survey documented the nearest milk and meat animal producing, 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 2022 report. There were gardens identified in all sectors except the NNW sector. Seven (7) new gardens were identified this year between the N, W, E, NW sectors and three (3) in the SSW sector within three (3) miles of the PBAPS release vents. The nearest garden in the SSW sector has been updated from the 2022 report; all other nearest gardens are the same as in the 2022 report.

Animals used for meat consumption were identified in all 16 sectors. Five (5) new sites were identified this year between the NE, NNE, SSW, W, NW and two within the three (3) mile radius of PBAPS.

Four (4) new sites were identified this year in N (3), ESE (1) sectors, within five (5) miles of the PBAPS release vents. The nearest animal in all sectors remain the same as in 2022 report. Dairy sites were identified in 12 of 16 sectors. There were two (2) new dairy sites observed in the SSW and W sectors within the three (3) mile radius of the Peach Bottom vents. There were no changes in the nearest milk-producing animal in any sector.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 84 Table D-1 Land Use Survey Distance of the Nearest Residence, Garden, Dairy, Meat Animal within a Five Mile Radius of Peach Bottom Atomic Power Station (Distance in feet) 2023 Sector Residence Garden (1)

Milk Animal Meat Animal N

12,362 14,003 14,183 14,183 NNE 11,112 11,041 10,843 10,843 NE 10,080 10,004 10,492 10,080 ENE 10,495 11,554 10,925*

10,925 E

10,066 14,540 14,471 14,995 ESE 16,085 19,109 20,154 16,085 SE 10,772 10,772 19,134*

19,134 SSE 3,912 3,912 14,392 S

5,545 5,545 9,247 SSW 6,072 5,837 11,602 7,187 SW 4,755 4,865 4,860*

4,860 WSW 4,036 7,487 4,204 W

5,327 5,327 5,136*

5,136 WNW 2,928 4,192 22,124 3,926 NW 2,948 4,806 9,545 4,806 NNW 5,124 5,124 (1) Larger than 500 square feet (as can best be determined from a distance)

Denotes current REMP milk sample location Red Denotes the site/site information has been updated from the previous years Land Use Census

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 85 Figure D-1 Peach Bottom Atomic Power Station Land Use Census

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 86 APPENDIX E Annual Radiological Groundwater Protection Program Report I.

Summary and Conclusions This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Peach Bottom Atomic Power Station (PBAPS) by Constellation Nuclear covers the period 01 January 2023 through 31 December 2023. 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 2023. During that time, 186 analyses were performed on 186 samples from 36 locations. These 36 locations include 24 groundwater monitoring wells, 2 groundwater seeps, 2 yard drain sumps, and 8 precipitation water sampling points. Phase 1 of the monitoring was part of a comprehensive study initiated by Constellation 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 Constellation 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), gamma-emitting radionuclides associated with licensed plant operations and isotopes known as hard to detects.

Based on the review of the data collected during the 2023 RGPP sampling rounds, AMO Environmental Decisions concludes:

Additional monthly sampling of MW-PB-24, MW-PB-25, MW-PB-26, and MW-PB-27 was completed in 2023 to monitor tritium concentrations in the area of MW-PB-25. In 2023, the average tritium concentration in samples collected from MW-PB-25 was approximately 2690 pCi/L.

The 3rd quarter 2022 RGPP sample collected from MW-PB-30 had a reported tritium concentration of 37,300 pCi/L. A subsequent sample was collected from MW-PB-30 on October 1, 2022, and the tritium result was 563 pCi/L, which reflected historic tritium concentrations in this well. However, the tritium concentration increased to 19,100 pCi/L in a subsequent sample collected in the middle of December 2022. An additional sample was collected from MW-PB-30

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 87 in March 2023 and the concentration increased to over 37,000 pCi/L. Station personnel completed an investigation to evaluate potential tritium sources in the area of this well and identified a steam leak in the Unit 2 Moisture Separator Room. According to station personnel, during heavier rain events, the roof drain piping, which passes through the Moisture Separator Room, becomes cold and liquid condenses from the humidity generated by the steam leak. The condensate pools within the Moisture Separator Room and flows to the sump within the room. Station personnel constructed a containment around the sump to stop condensate from entering the pit. Tritium concentrations in MW-PB-30 have been decreasing since the containment was installed around the sump in the Unit 2 Moisture Separator Room. As of November 2023, the tritium concentration decreased to 7,690 pCi/L.

Gross-alpha analysis was most recently performed on Source and Long-Term Shutdown designated wells, during the 2nd quarter 2022 RGPP sampling round. All Long-Term Shutdown and Source designated wells will have gross-alpha analysis performed again in 2024.

The sample collected from MW-PB-25 was analyzed for select transuranics during the 2nd quarter 2023. No select transuranics were detected in the sample.

Gamma-radionuclides were not detected at concentrations greater than their respective LLDs in 2022. Gamma-radionuclides and gross-alpha analyses will be performed again in 2024.

Sr-89 and Sr-90 were not detected at concentrations greater than their respective LLDs in 2023.

Hard-to-detects (Fe-55 and Ni-63) were not detected at concentrations greater than their respective LLDs in 2023. Hard-to-detects (Fe-55 and Ni-63) analyses will be performed on samples collected from Long-Term Shutdown designated wells in 2024 and Source designated wells in 2026.

Tritium present in precipitation recapture was not likely to affect groundwater quality in the vicinity of the PBAPS in 2023. The maximum tritium concentration in precipitation samples collected in 2023 was 355 pCi/L.

In assessing all the data gathered for this report, it was concluded that the station conformed with its RGPP in 2023 with respect to sampling protocol and the operation of PBAPS had no adverse radiological impact on the environment offsite of PBAPS.

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

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 88 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) and GEL Laboratories (GEL) on samples collected in 2023.

A. Objective of the RGPP

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).

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).

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 89 B. Implementation of the Objectives The objectives identified have been implemented at PBAPS via Constellation 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 Samples for the ongoing ground water monitoring program were collected by Constellation Generation Solutions (CGS). This section describes the general collection methods used to obtain environmental samples for the PBAPS RGPP in 2023. Sample locations can be found in Table E-1, Appendix E.

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.

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

D. Characteristics of Tritium (H-3)

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

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 90 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 and/or boron-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 (3He). 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 is one of the least dangerous radionuclides because it emits very weak radiation 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.

III. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE and GEL to analyze the environmental samples for radioactivity for the PBAPS RGPP in 2023.

To achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater.

2. Concentrations of strontium in groundwater.

3.

Concentrations of tritium in groundwater, surface water and precipitation water.

4.

Concentrations of 'hard-to-detect' isotopes, Am-241, Cm-242, Cm-243, Cm-244, Pu-238, Pu-239, Pu-240, U-233, U-234, U-235, U-238, Fe-55, and nickel-63 Ni-63 in groundwater. These analyses are required based on historical tritium results.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 91 B. Data Interpretation The radiological data collected prior to PBAPS becoming operational were used as a baseline for operational data comparison. For 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. Constellation 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. Constellation 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 report for reporting consistency with the AREOR. Groundwater was analyzed using gamma spectroscopy for the following isotopes: 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.

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)

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 92 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 lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium 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.

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 below100 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.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 93 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 a Constellation-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.

The Constellation fleet-wide and Peach Bottom RGPP was modified at the beginning of 2020. Changes to the RGPP included sample locations, frequency, and the removal of surface water sampling.

IV. Results and Discussion A.

Groundwater Results Samples were collected from onsite 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. Tritium values ranged from non-detectable to 37,000 pCi/L. There is no drinking water pathway available from these groundwater sample locations. (Table E-9, Appendix E)

Strontium Samples from 15 locations, Monitoring Wells and Yard drains, were analyzed for Sr-89 and Sr-90. All results were below the required LLDs. (Table E-6, Appendix E)

Gross Alpha (dissolved and suspended)

Gross Alpha sampling was performed in 2022 and will be next performed in 2024.

Select Transuranics MW-PB-25 was analyzed for select transuranics in the 2nd quarter of 2023. U-233/234 and U-238 were detected in MW-PB-25 and MW-PB-27. The U-233/234 concentrations ranged from 0.6368 pCi/L (MW-PB-25) to 5.603 pCi/L (MW-PB-27). The U-238 concentrations ranged from 0.3184 pCi/L (MW-PB-25) to 2.287 pCi/L (MW-PB-27).

Additionally, to satisfy the ANI request, the well with the highest average gross-alpha (dissolved) concentration (MW-PB-16) was analyzed for select transuranics during the

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 94 2nd quarter 2022. No select transuranics were detected in the sample collected from MW-PB-16. (Table E-7, Appendix E)

Gamma Emitters No samples were analyzed for gamma-radionuclides in 2023. Per the RGPP, the next time gamma-radionuclide analysis will be performed is 2024. (Table E-11, Appendix E)

Hard-To-Detect HTD analyses were performed in 2023 on 5 groundwater locations. There were no detects and all results were below the required LLDs. (Table E-5, Appendix E)

B.

Precipitation Sample Results Tritium Tritium activity was detected in 10 of 20 samples collected from 8 precipitation water locations. The concentrations ranged from below LLD, <175 pCi/L to 355 pCi/L. These concentrations are consistent with historical values observed. (Table E-10, Appendix E)

C.

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 2022(4). The updated water well database search indicated a new water well off PBAPS property within a one mile radius. 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 2006-2022.

D. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and GEL are presented in the AREOR (Appendix C).

E. Leaks, Spills and Releases The 3rd quarter 2022 RGPP sample collected from MW-PB-30 had a reported tritium concentration of 37,300 pCi/L. A subsequent sample was collected from MW-PB-30 on October 1, 2022 and the tritium result was 563 pCi/L, which reflected historic tritium concentrations in this well. However, the tritium concentration increased to 19,100 pCi/L in a subsequent sample collected in the middle of December 2022. An additional sample was collected from MW-PB-30 in March 2023 and the concentration increased to over 37,000 pCi/L. Station personnel completed an investigation to evaluate potential tritium sources in the area of this well and identified a steam leak in the Unit 2 Moisture Separator Room. According to station personnel, during heavier rain events, the roof drain piping, which passes through the Moisture Separator Room, becomes cold and liquid condenses from the humidity generated by the steam leak. The condensate pools

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 95 within the Moisture Separator Room and flows to the sump within the room. Station personnel constructed a containment around the sump to stop condensate from entering the pit. Tritium concentrations in MW-PB-30 have been decreasing since the containment was installed around the sump in the Unit 2 Moisture Separator Room. As of November 2023, the tritium concentration decreased to 7,690 pCi/L.

F. 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. During the 4th quarter 2020, the tritium concentration unexpectedly increased in the samples collected from Unit 3 Yard Drain and bedrock aquifer well MW-PB-28, from less than 200 pCi/L to 1,670 pCi/L and 1,540 pCi/L, respectively. An additional sample was collected from both locations in the middle of January 2021. The tritium concentration in the sample collected from Unit 3 Yard Drain increased to 2,850 pCi/L and the tritium concentration in the sample collected from MW-PB-28 increased to 3,690 pCi/L. Tritium concentrations in the area of MW-PB-28 and Unit 3 Yard Drain decreased to less than 400 pCi/L by the end of 2021.

G. 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.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 96 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 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 2023.

The third table lists the activity of the wells from the last sampling of 2023.

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-24 432 6/6/2023 MW-PB-25 6290 7/18/2023 MW-PB-26 582 3/15/2023 MW-PB-27 1680 11/7/2023 Well #

Tritium Activity Date MW-PB-24

<197 11/7/2023 MW-PB-25

<198 11/7/2023 MW-PB-26 433 11/7/2023 MW-PB-27 1680 11/7/2023

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 97 Potential sources of tritium in the groundwater are investigated via procedural processes and documented in the corrective action program. 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.

Monthly sampling of MW-PB-24, MW-PB-25, MW-PB-26, and MW-PB-27 was completed in 2023 to monitor tritium concentrations in the area of MW-PB-25. In 2023, the average tritium concentration in samples collected from MW-PB-25 was approximately 7,400 pCi/L. The Station will continue to sample MW-PB-25, as well as nearby wells MW-PB-24, MW-PB-26, and MW-PB27, on a monthly basis to monitor tritium concentrations in the area of MW-PB-25 and evaluate potential sources of the fluctuating tritium concentration in the area of the well.

MW-PB-28 Increased the monitoring frequency for MW-PB-28 in January of 2021 and started an investigation to ensure there were no active leaks. Investigation of the areas of the Unit 3 Yard Drains and MW-PB-28 identified tritium in the Torus Dewater Tank Moat because of a small packing leak. It was noted that the condition of the Torus Dewatering Tank Moat could allow for the leaking water to penetrate the concrete and seep into the ground.

H.

Actions Taken

1. Installation of Monitoring Wells No new monitoring wells.

2. Actions to Recover/Reverse Plumes There were no actions to recover the plume.

3. Removed the tritiated water from the Torus Dewatering Tank Moat and repaired the packing leak. Sealed the cracks observed in the moat surface, temporarily recoated the moat and will be performing additional repairs to the moat in 2023.

Results have stabilized and the well is no longer sampled on an increased frequency. No new actions were required to recover or reverse groundwater plumes in 2023.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 98 I.

Deviations and Enhancements Table E-9 shows that duplicate and split samples were obtained at several sample locations in 2023. These duplicate samples were obtained and analyzed for quality control purposes.

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 2022.

5.

AMO Environmental Decisions, 2023 Annual RGPP Monitoring Report Summary of Results and Conclusions Peach Bottom Generating Station Delta, Pennsylvania.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 99 TABLE E-1 Locations of Onsite Radiological Groundwater Protection Program Peach Bottom Atomic Power Station, 2023 Site Site Type Sector Distance (ft)

MW-PB-1 Groundwater Well SW 1,166.6 MW-PB-2 Groundwater Well WNW 309 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-19 Groundwater Well NW 226.8 MW-PB-20 Groundwater Well E

260.5 MW-PB-22 Groundwater Well NE 315.4 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 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 U/2 YARD Groundwater SSE 498.7 U/3 YARD Groundwater WSW 175.8 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

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 100 Figure E-2 Well Water Sample Locations for the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2023

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 101 Figure E-3 Radiological Groundwater Protection Program Monitoring Locations Peach Bottom Atomic Power Station, 2023

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 102 Figure E-4 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Peach Bottom Atomic Power Station, 2023

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 103 Table E-5 Hard to Detects in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date Fe-55 Ni-63 MW-PB-10 6/6/2023

<62.41

<4.76 MW-PB-15 6/6/2023

<126.2

<4.22 MW-PB-16 6/6/2023

<60.14

<4.16 MW-PB-8 6/6/2023

<151.7

<4.28 MW-PB-25 6/6/2023

<181.5

<4.85

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 104 Table E-6 Concentration of Radiostrontium in Groundwater (Results in units of pCi/L +/- 2)

End Collection Date Location Sr-89 Sr-90 6/6/2023 MW-PB-19 5.78 0.88 6/6/2023 MW-PB-28 4.37 0.77 6/6/2023 MW-PB-10 7.69 0.85 6/6/2023 MW-PB-15 6.79 0.89 6/6/2023 MW-PB-16 7.32 0.85 6/6/2023 MW-PB-8 6.71 0.89 6/6/2023 MW-PB-31 8.83 0.70 6/6/2023 MW-PB-29 7.49 0.65 6/6/2023 MW-PB-26 4.44 0.84 6/6/2023 MW-PB-27 9.47 0.80 6/6/2023 MW-PB-25 7.27 0.88 6/6/2023 MW-PB-30 6.77 0.89 6/7/2023 Unit 3 YARD DRAIN 8.45 0.86 6/7/2023 MW-PB-20 4.39 0.67 6/15/2023 Unit 2 YARD DRAIN 8.97 0.79

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 105 Table E-7 Alpha Isotopic and Transuranics in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-233/234 U-235 U-238 MW-PB-25 6/6/2023

<0.08

<0.05

<0.11

<0.08

<0.04

<0.08

<0.11

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 106 Table E-8 Gross Alpha Activity in Groundwater (Results in units of pCi/L +/- 2)

No samples were analyzed for gross alpha in 2023. Per the RGPP, all Long-Term Shutdown and Source designated wells will have gross-alpha analysis performed in 2024.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 107 Table E-9 Concentration of Tritium in Groundwater (Results in units of pCi/L +/- 2)

LOCATION 2/16/2023 3/10/2023 3/14/2023 3/15/2023 6/6/2023 6/7/2023 6/15/2023 8/29/2023 8/31/2023 11/7/2023 Unit 2 Yard Drain ND 435+/-142 ND ND ND ND 415+/-138 ND 566+/-140 ND Unit 3 Yard Drain 180+/-113 ND ND 315+/-134 ND 349+/-133 ND 330+/-126 ND 810+/-169 MW-PB-1 ND ND ND ND

<187 ND ND ND ND ND MW-PB-1Dup ND ND ND ND

<190 ND ND ND ND ND MW-PB-1Split ND ND ND ND

<159 ND ND ND ND ND MW-PB-2 ND ND ND ND

<185 ND ND ND ND ND MW-PB-3 ND ND ND ND

<196 ND ND ND ND ND MW-PB-4 ND ND ND ND ND

<191 ND ND ND

<199 MW-PB-5 ND ND ND ND

<188 ND ND ND ND ND MW-PB-5Dup ND ND ND ND

<189 ND ND ND ND ND MW-PB-5Split ND ND ND ND

<165 ND ND ND ND ND MW-PB-6 ND ND ND ND

<184 ND ND ND ND ND MW-PB-7 ND ND ND ND

<190 ND ND ND ND ND MW-PB-7Dup ND ND ND ND

<184 ND ND ND ND ND MW-PB-7Split ND ND ND ND

<166 ND ND ND ND ND MW-PB-8 ND ND

<199 ND

<189 ND ND

<176 ND

<198 MW-PB-8Dup ND ND ND ND ND ND ND ND ND

<196 MW-PB-8Split ND ND ND ND ND ND ND ND ND

<154 MW-PB-10 ND ND

<199 ND

<189 ND ND

<174 ND

<198 MW-PB-10Dup ND ND

<198 ND ND ND ND ND ND

<196 MW-PB-10Split ND ND

<150 ND ND ND ND ND ND

<157 ND - No Data, Sample obtained as required.

(Dup) - Sample analyzed in duplicate by TBE.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 108 Table E-9 (cont.)

Concentration of Tritium in Groundwater (Results in units of pCi/L +/- 2)

LOCATION 1/6/2023 2/16/2023 2/20/2023 3/14/2023 3/15/2023 4/11/2023 5/17/2023 6/6/2023 6/7/2023 6/15/2023 7/18/2023 8/29/2023 11/7/2023 MW-PB-12 ND ND ND ND ND ND ND ND 311+/-133 ND ND ND 273+/-131 MW-PB-12 Dup ND ND ND ND ND ND ND ND ND ND ND ND 325+/-135 MW-PB-12 Split ND ND ND ND ND ND ND ND ND ND ND ND

<156 MW-PB-13 ND ND ND ND ND ND ND

<185 ND ND ND ND

<195 MW-PB-15 ND ND ND

<199 ND ND ND

<187 ND ND ND

<177

<197 MW-PB-15 Dup ND ND ND

<198 ND ND ND ND ND ND ND

<175 ND MW-PB-15 Split ND ND ND

<152 ND ND ND ND ND ND ND

<162 ND MW-PB-16 ND ND ND

<187 ND ND ND

<184 ND ND ND

<173

<198 MW-PB-16 Dup ND ND ND ND ND ND ND ND ND

<190 ND

<176 ND MW-PB-16 Split ND ND ND ND ND ND ND ND ND ND ND

<167 ND MW-PB-19 ND ND ND ND 370+/-138 ND ND 249+/-123 ND ND ND 284+/-123 257+/-131 MW-PB-20 ND ND ND

<190 ND ND ND ND

<194 ND ND

<175

<200 MW-PB-22 ND ND ND ND ND ND ND ND 280+/-129 ND ND ND 204+/-127 MW-PB-24 344+/-131 214+/-118 ND ND

<121 371+/-124 344+/-125 432+/-135 ND ND 381+/-134

<183

<197 MW-PB-25 3960+/-465 383+/-123 ND ND 1730+/-254 1910+/-255 4100+/-473 4060+/-475 ND ND 6290+/-697 1580+/-227

<198 MW-PB-26 363+/-133 530+/-131 ND ND 582+/-152 470+/-128 271+/-122 354+/-134 ND ND 321+/-132 414+/-128 433+/-138 MW-PB-27 849+/-171 1630+/-229 ND ND 751+/-156 465+/-128 389+/-129 436+/-136 ND ND 316+/-134 411+/-124 1680+/-245 MW-PB-28 ND 523+/-151 ND ND 907+/-175 ND ND

<185 ND ND ND

<178

<184 MW-PB-29 621+/-152 302+/-123 ND 528+/-147 ND 467+/-125 373+/-129 753+/-159 ND ND 378+/-136 301+/-122 324+/-137 MW-PB-30 1880+/-266 21300+/-2200 25500+/-2600 14100+/-1480 ND 6670+/-726 1630+/-232 18600+/-1920 ND ND 1440+/-224 5190+/-586 7690+/-834 MW-PB-31 358+/-137 439+/-127 ND 322+/-139 ND 177+/-115 ND 248+/-131 ND ND

<196

<174 673+/-156 ND - No Data, Sample obtained as required.

(Dup) - Sample analyzed in duplicate by TBE.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 109 Table E-10 Concentration of Tritium in Precipitation and Subsurface Drainage (Results in units of pCi/L +/- 2)

LOCATION 2/16/2023 6/6/2023 6/7/2023 8/29/2023 11/7/2023 PB-P1

<175 ND ND

<195 ND PB-P2 170+/-108 ND ND 271+/-131 ND PB-P3 270+/-117 ND ND

<196 ND PB-P4 330+/-120 ND ND 264+/-131 ND PB-P5 282+/-125 ND ND 233+/-129 ND PB-P6 259+/-122 ND ND

<196 ND PB-P7 355+/-134 ND ND

<199 ND PB-P8 302+/-124 ND ND

<197 ND SP-PB-1 ND ND

<185 ND

<199 SP-PB-2 ND ND

<189 ND

<196 ND - No Data, Sample obtained as required.

January 1 - December 31, 2023 Docket Nos. 50-171, 50-277, 50-278 110 Table E-11 Gross Concentration of Gamma Emitters in Groundwater and Subsurface Drainage (Results in units of pCi/L +/- 2)

No samples were analyzed for gamma-radionuclides in 2023. Per the RGPP, the next time gamma-radionuclide analysis will be performed is 2024.

ML24150A273

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