L-25-065, Annual Radiological Environmental Operating Report

Annual Radiological Environmental Operating Report

ML25119A125
Person / Time
Site:	Perry
Issue date:	04/28/2025
From:	Penfield R Vistra Operations Company
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
L-25-065
Download: ML25119A125 (1)

Text

Rod L Penfield Site Vice President, Peny Nuclear April 28th, 2025 L-25-065 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Perry Nuclear Power Plant Docket No. 5000-440 Annual Radiological Environmental Operating Report Vistra Perry Nuclear Power Plant JO Center Road Peny, Ohio 44081 440-280-5382 724-462-0816 (cell) 10CFR50.36{a)

Enclosed is the Annual Radiological Environmental Operating Report for the Perry Nuclear Power Plant (PNPP) for the period of January 1, 2024 through December 31, 2024. This document partially satisfies the requirements of the PNPP Technical Specifications (TS), the PNPP Offsite Dose Calculation Manual (ODCM), and the Environmental Protection Plan contained in Appendix B of the PNPP Operating License.

There are no regulatory commitments contained in this letter. If there are any questions or if additional information is required, please contact Mr. Eli Crosby, Senior Manager of Radiation Protection and Chemistry at (440) 280-5032.

Sincerely,

'it?d Rod Penfield

Enclosures:

A PNPP Annual Radiological Environmental Operating Report 2024 cc:

NRC Project Manager NRC Resident Inspector NRC Region 111

Enclosure A L-25-065 PNPP 2024 Annual Radiological Environmental Operating Report

Annual Radiological Environmental Operating Report YEAR: 2024 Page 1 of 82 Company: Vistra I Plant: Perry Nuclear Power Plant Annual Radiological Environmental Operating Report 2024 Document Number: L-25-065

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 2 of 82 Company: Vistra Plant: Perry Nuclear Power Plant TABLE OF CONTENTS Page 1.0 EXECUTIVE

SUMMARY

................................................................................................ 6

2.0 INTRODUCTION

............................................................................................................ 6 2.1 Radiological Environmental Monitoring Program................................................. 6 2.2 Pre-Operational REMP....................................................................................... 8 2.3 Operational REMP.............................................................................................. 8 3.0 SAMPLE LOCATIONS................................................................................................... 8 4.0 MAPS OF COLLECT ION SITES................................................................................. 10 5.0 SAMPLING ANALYSIS................................................................................................ 12 5.1 Sampling Program............................................................................................ 13 5.2 Sampling Changes............................................................................................ 14 6.0 ATMOSPHERIC MONITORING................................................................................... 15 7.0 TERRESTRIAL MONITORING..................................................................................... 16 7.1 Milk................................................................................................................... 16 7.2 Broadleaf Vegetation........................................................................................ 16 8.0 AQUATIC MONITORING............................................................................................. 16 8.1 Water................................................................................................................ 17 8.2 Sediment.......................................................................................................... 17 8.3 Fish................................................................................................................... 18 9.0 DIRECT RADIATION MONITORING............................................................................ 18

10.0 CONCLUSION

............................................................................................................. 19 11.0 INTER-LABORATORY CROSS-CHECK COMPARISON PROGRAM.......................... 19 12.0 LAND USE CENSUS EXPOSURE PATHWAY............................................................. 19 12.1 Introduction....................................................................................................... 20 12.2 Discussion and Results..................................................................................... 20 13.0 ANNUAL ENVIRONMENTAL OPERATING REPORT.................................................. 22 14.0 ODCM NON-COMPLIANCES...................................................................................... 22 14.1 Non-Compliances............................................................................................. 22 14.2 Sampling Challenges........................................................................................ 22 15.0 CORRECTIONS TO PREVIOUS REPORTS................................................................ 23 16.0 BIBLIOGRAPHY........................................................................................................... 23 : Inter-Laboratory Cross Check Comparison Program Results............................ 25 : REMP Data Summary Reports.......................................................................... 44 : 2024 REMP Detailed Data Report..................................................................... 51

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 3 of 82 Company: Vistra Plant: Perry Nuclear Power Plant TABLES Page Table 1: REMP Sampling Locations........................................................................................... 9 Table 2: REMP Sample Analyses.............................................................................................14 Table 3: Air Particulate Gross Beta Comparison of Current Year and Historic Data..................16 Table 4: Nearest Residence - By Sector...................................................................................20 Table 5: Nearest Garden - By Sector........................................................................................21 FIGURES Page Figure 1: Potential exposure pathways to members of the public from plant operations [1]........ 7 Figure 2: REMP Sample Locations within Two Miles of the Plant Site.......................................10 Figure 3: REMP Sampling Locations between Two and Eight Miles from the Plant Site............11 Figure 4: REMP Sampling Locations Greater Than Eight Miles from the Plant Site..................12 Figure 5: Air Particulate Gross Beta Comparison of Current Year and Historic Data.................15 Figure 6: Annual Average Gross Beta Activity in Water.............................................................17 Figure 7: Average Quarterly TLD Dose.....................................................................................18 Figure 8: Land Use Census Map...............................................................................................21

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 4 of 82 Company: Vistra Plant: Perry Nuclear Power Plant LIST OF ACRONYMS AND DEFINITIONS

1.

Airborne Activity Sampling: Continuous sampling of air through the collection of particulates and radionuclides on filter media. Periodic soil samples are collected for gamma isotopic analysis to provide information on deposition to the soil from airborne releases.

2.

AIP: Air, Iodine and Particulate

3.

ARERR: Annual Radioactive Effluent Release Report

4.

AREOR: Annual Radioactive Environmental Operating Report

5.

BLV: Broad Leaf Vegetation

6.

BWR: Boiling Water Reactor

7.

Composite Sample: A series of single collected portions (aliquots) analyzed as one sample. The aliquots making up the sample are collected at time intervals that are very short compared to the composite period.

8.

Control: A sampling station in a location not likely to be affected by plant effluents due to its distance and/or direction from Perry Nuclear Power Plant.

9.

Curie (Ci): A measure of radioactivity; equal to 3.7E+10 disintegrations per second or 2.22E+12 disintegrations per minute.

10.

Direct Radiation Monitoring: Measurement of radiation dose at various distances from the plant using thermoluminescent dosimeters.

11.

DW: Drinking Water

12.

Grab Sample: A single discrete sample drawn at one point in time.

13.

Indicator: A sampling location that is likely to be affected by plant effluents due to its proximity and/or direction from the plant.

14.

Ingestion Pathway: The ingestion pathway includes milk, fish, drinking water and garden produce. Also sampled (under special circumstances) are other media such as vegetation and animal products such as eggs and meat when additional information about particular radionuclides is needed.

15.

Lower Limit of Detection (LLD): The smallest concentration of radioactive material in a sample that will yield a net count (above system background) that will be detected with 95% probability with a 5% probability of a false conclusion that a blank observation represents "real" signal.

16.

MDA: Minimum Detectable Activity

17.

Mean: The average, i.e., the sum of results divided by the number of results.

18.

NA: Not Applicable

19.

NIST: National Institute of Standards and Technology.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 5 of 82 Company: Vistra Plant: Perry Nuclear Power Plant

20.

NRC: Nuclear Regulatory Commission

21.

ODCM: Offsite Dose Calculation Manual

22.

pCi: is equal to one trillionth of a Curie or 2.22 disintegrations per second.

23.

pCi/L: picoCuries / Liter

24.

PNPP: Perry Nuclear Power Plant

25.

PWR: Pressurized Water Reactor

26.

REMP: Radiological Environmental Monitoring Program

27.

SW: Surface Water

28.

TLD: Thermoluminescent Dosimeter

29.

TS: Technical Specification

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 6 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1.0 EXECUTIVE

SUMMARY

The Annual Radiological Environmental Operating Report (AREOR) details the results of Radiological Environmental Monitoring Program (REMP) conducted at the Perry Nuclear Power Plant (PNPP) from January 01 through December 31, 2024. This report, in conjunction with the ARERR, meets all requirements in PNPP Offsite Dose Calculation Manual (ODCM). Report topics include radiological environmental monitoring and the land use census. The results of the environmental and effluent programs indicate that the operations of the PNPP did not result in any adverse environmental impact.

2.0 INTRODUCTION

The Radiological Environmental Monitoring Program (REMP) was established in 1981 to monitor the radiological conditions in the environment around PNPP. The operational REMP was initiated in 1986 and has continued through this reporting period. The REMP is conducted in accordance with the PNPP ODCM. This program includes collection and analysis of environmental samples and evaluation of results at indicator as well as control locations. Indicator samples are collected at locations determined to be most influenced by operation of the PNPP. Control samples are collected at locations beyond the measurable influence of the PNPP for data comparison The REMP was established at PNPP for several reasons. First, it verifies the adequacy of plant design and operation to control radioactive materials and limit effluent releases. Second, it assesses the radiological impact, if any, that the plant has had on the surrounding environment. Third, it ensures compliance with regulatory guidelines. The REMP is conducted in accordance with Appendix B of the PNPP Operating License, Technical Specifications, the ODCM, Nuclear Regulatory Commission (NRC) Regulatory Guide 4.1, NUREG 1302 [3], and the 1979 NRC Branch Technical Position [9].

2.1 Radiological Environmental Monitoring Program A variety of samples are collected as part of the PNPP REMP. The selection of sample types, locations, and collection frequency are based on many variables. Potential pathways for the transfer of radionuclides through the environment to humans, sample availability, local meteorology, population characteristics, land use, and NRC requirements are all factors and are diagramed in Figure 1.

To ensure that the REMP data is significant and valuable, detailed sampling methods and procedures are followed to ensure that samples are collected in the same manner and from the same locations each time. All samples are packaged on site and then shipped to an independent vendor laboratory for analysis. The vendor laboratory analyzes the samples and reports results to the PNPP Chemistry Unit staff, the Lake County General Health District, and the State of Ohio Department of Health. Additionally, the Lake County General Health District obtains split samples of milk (when available),

water, fish, sediment, and vegetation to perform an independent verification of PNPPs REMP.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 7 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Deposition

• • • • • ***** Ingest" Live. tock products

• • * * : Behavior of radionuclides Figure 1: Potential exposure pathways to members of the public from plant operations [1].

The REMP provides data on measurable levels of radiation and radioactive materials in the environment. This program also evaluates the relationship between quantities of radioactive materials released from the plant and resultant doses to individuals from principal pathways of exposure. In this capacity, REMP provides a check on the effluent release program and dispersion modeling to ensure that concentrations in the environment radioactive effluents conform to the "As Low as Is Reasonably Achievable" (ALARA) design objectives of 10 CFR 50, Appendix I. REMP is designed to conform to the NRC Regulatory Guide 4.1, NUREG 1302 [3], and the 1979 NRC Branch Technical Position [9].

Quality assurance aspects of the sampling program and TLD data collection are conducted in accordance with Regulatory Guide 4.15 [7] and Regulatory Guide 4.13 [11]. REMP also adheres to the requirements of the State of Ohio, PNPP Technical Specifications, and the Offsite Dose Calculation Manual (ODCM). These documents dictate the environmental sampling, sample analysis protocols, data reporting, and quality assurance requirements for the environmental monitoring program.

The AREOR provides summaries of the environmental data from exposure pathways, interpretations of the data, and analyses of trends of the results. Routinely monitored pathways include ingestion, inhalation, and direct radiation. Routes of exposure are based on site specific information such as meteorology, receptor locations, and water usage around the plant.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 8 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 2.2 Pre-Operational REMP The REMP was established at PNPP six years before the plant became operational.

Between 1981 and 1986 environmental monitoring involved collection and analysis of environmental samples. This pre-operational program was designed to provide data on background radiation levels and radioactivity normally present in the area to establish a baseline for data comparison prior to plant operation plant. PNPP has continued monitoring the environment during plant operation by collecting and analyzing samples of air, milk, fish, vegetation, water, and sediment, and by measuring radiation directly.

The contribution of radionuclides to the environment resulting from PNPP operation is assessed by comparing results from the environmental monitoring program with pre-operational data, operational data from previous years, and control location data. The results for each sample type are compared to historical data to determine whether trends or changes in concentrations are observable.

2.3 Operational REMP Results of air samples collected to monitor the radioactivity in the atmosphere indicated normal background radionuclide concentrations.

Terrestrial monitoring included the analysis of vegetation due to the unavailability of milk samples. Results terrestrial monitoring indicated concentrations of radioactivity similar to those found in previous years. Analyses of vegetation samples detected only natural radioactivity and indicated no radioactivity attributable to operation of the PNPP.

Aquatic monitoring included the collection and analyses of water, fish, and shoreline sediments. Analysis of these samples showed normal background radionuclide concentrations.

Direct radiation measurements showed no significant changes from previous years. The indicator locations averaged 14.6 mrem/quarter and control locations averaged 14.1 mrem/quarter. Radiation dose near PNPP was similar to the radiation dose measured at locations greater than ten miles away from PNPP.

Results from indicator samples collected during this reporting period were compared to control sample results and pre-operational data. Based on the results, it can be concluded that the operation of the PNPP resulted in no significant increase in the radionuclide concentrations observed in the surrounding environment. The results of the REMP indicate adequate control of radioactivity released from PNPP. These results also demonstrate that PNPP complies with federal regulations.

3.0 SAMPLE LOCATIONS REMP samples are collected at numerous locations, both on site and up to 16.2 miles from the plant. Sampling locations are divided into two categories: indicator and control.

Indicator locations are close to the plant and monitor for any environmental impact due to plant operations. Control locations are those that are unaffected by plant operation; they are a greater distance from the plant and in the least prevalent wind directions.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 9 of 82 Company: Vistra Plant: Perry Nuclear Power Plant Data obtained from the indicator locations are compared with data from the control locations. This comparison allows naturally occurring background radiation to be considered when evaluating any radiological impact PNPP may have had on the environment. Table 1, Figure 2, Figure 3, and Figure 4 identify the PNPP REMP sampling locations. Many REMP samples are collected in addition to those required by the PNPP ODCM. The ODCM requirements for each sample type are discussed in more detail later in the report.

Table 1: REMP Sampling Locations Location #

Description Miles Direction Media (1) 1 Chapel Road 3.4 ENE TLD, AIP 3

Meteorological Tower 1.0 SE TLD, AIP 4

Site Boundary 0.7 S

TLD, AIP 5

Quincy Substation 0.6 SW TLD, AIP 6

Concord Service Center 11.0 SSW TLD, AIP 7

Site Boundary 0.6 NE TLD, AIP, Broadleaf Vegetation 8

Site Boundary 0.8 E

TLD 9

Site Boundary 0.7 ESE TLD 10 Site Boundary 0.8 SSE TLD 11 Parmly Rd. at Center Rd.

0.6 SSW TLD 12 Site Boundary 0.6 WSW TLD 13 Madison-on-the-Lake 4.7 ENE TLD 14 Hubbard Rd.

4.9 E

TLD 15 Eagle St. Substation 5.1 ESE TLD 16 Eubank Garden 0.9 S

Broadleaf Vegetation 20 Rainbow Farms 1.9 E

Broadleaf Vegetation 21 Hardy Rd. - Painesville Township Park 5.1 WSW TLD 23 High St. Substation 7.9 WSW TLD 24 St. Clair Ave. at Mentor Substation 15.1 SW TLD 25 Offshore - PNPP discharge 0.6 NNW Fish 29 River Rd.at Turney Rd.

4.3 SSE TLD 30 Lane Rd.

4.8 SSW TLD 31 Wood Rd. at River Rd.

4.8 SE TLD 32 Offshore - Mentor-on-the-Lake 15.8 WSW Fish 33 River Rd. at Blair Rd.

4.5 S

TLD 34 PNPP Intake 0.2 NW Surface Water 35 Site Boundary 0.6 E

TLD, AIP 36 Lake County Water Plant 3.9 WSW TLD, Drinking Water 37 Gerlica Farm 1.5 ENE Broadleaf Vegetation 39 Painesville Purification Plant 8.3 W

Drinking Water 53 3715 Parmly Rd.

0.5 WSW TLD 54 Hale Rd. School 4.6 SW TLD 55 Center Rd. behind soccer field 2.5 S

TLD 56 Madison High School 4.0 ESE TLD 57 Perry High School 1.7 S

TLD 58 Antioch Rd.

0.8 ENE TLD 59 Lake Shoreline at Green Rd.

4.0 ENE Surface Water 60 Lake Shoreline at Perry Park 1.0 WSW Surface Water 64 Northwest Drain Mouth 0.4 WNW Sediment 66 Lake Shore, Metropolitan Park 1.4 NE Sediment 70 H&H Farm Stand 16.2 SSW Broadleaf Vegetation (1) AIP = Air, Iodine and Particulate TLD = Thermoluminescent Dosimeter

Annual Radiological Environmental Operating Report YEAR: 2024 Page 10 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant 4.0 MAPS OF COLLECT ION SITES

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Figure 2: REMP Sample Locations within Two Miles of the Plant Site.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 11 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant w

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Annual Radiological Environmental Operating Report YEAR: 2024 Page 12 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant 20 Mill\\

Figure 4: REMP Sampling Locations Greater Than Eight Miles from the Plant Site.

5.0 SAMPLING ANALYSIS When environmental samples are analyzed for radioactivity, several types of measurements are performed to provide information about the types of radiation and radionuclides present. The major analyses that are performed are discussed below.

Gross beta activity measures the total amount of beta-emitting radioactivity present in a sample and acts as a tool to identify samples that may require further analysis. Beta radiation may be released by many different radionuclides. Since beta-decay results in a continuous energy spectrum rather than the discrete energy levels, or "peaks",

associated with gamma radiation, identification of specific beta-emitting nuclides is more difficult. Therefore, gross beta activity only indicates whether the sample contains normal or abnormal amounts of beta emitting radioactivity; it does not specifically identify the radionuclides present.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 13 of 82 Company: Vistra Plant: Perry Nuclear Power Plant Gamma spectral analysis provides more specific information than does the analysis for gross beta activity. Gamma spectral analysis identifies each radionuclide and the amount of radioactivity present in the sample that is emitting gamma radiation. Each radionuclide has a very specific "fingerprint" that allows for accurate identification and quantification.

Iodine activity analysis measures the amount of radioactive iodine present in a sample.

Some media (e.g., air sample charcoal cartridges) are analyzed directly by gamma spectral analysis. With other media (e.g., milk), the radioiodines are extracted by chemical separation before being analyzed by gamma spectral analysis.

Tritium activity analysis measures the amount of the radionuclide tritium (H-3) present in a sample. Tritium is an isotope of hydrogen that emits low-energy beta particles. Tritium occurs naturally from interactions with atmospheric cosmic rays and is also man-made from the nuclear fission process.

Gamma doses received by Thermoluminescent Dosimeters (TLD) while in the field are determined by a special laboratory procedure. Thermoluminescence is a process by which ionizing radiation interacts with the sensitive phosphor material in the TLD. Energy is trapped in the TLD material and can be stored for months or years. This capability provides a method to measure the dose received over long periods of time. The amount of energy that was stored in the TLD as a result of interaction with radiation is released by a controlled heating process and measured in a calibrated reading system. As the TLD is heated, the phosphor releases the stored energy as light. The amount of light is directly proportional to the amount of radiation to which the TLD was exposed.

The required REMP detection limits for samples are determined by sample media and the radionuclide that is being analyzed. The NRC has established LLDs for REMP sample analysis. These LLDs are listed in the PNPP ODCM. The vendor laboratory for REMP sample analysis has complied with these LLDs.

Table 2 provides a list of the analyses performed on environmental samples collected for the PNPP REMP, with the exception of terrestrial monitoring of milk samples. No milk-producing animals are located within the required distance per the ODCM, reference Section 7.1 Milk.

5.1 Sampling Program The contribution of radionuclides to the environment resulting from PNPP operation is assessed by comparing results from the environmental monitoring program with pre-operational data (i.e., data from before 1986), operational data from previous years, and control location data. The results for each sample type are discussed below and compared to historical data to determine if there are any observable trends. All results are expressed as concentrations. Refer to Appendix B, 2024 REMP Data Summary Reports for a detailed listing of these results. The NRC requires special reporting whenever sample analysis results exceed set limits. No values exceeded those limits.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 14 of 82 Company: Vistra Plant: Perry Nuclear Power Plant Table 2: REMP Sample Analyses Type Sample Frequency Analysis Atmospheric Monitoring Airborne Particulates Weekly Gross Beta Activity Quarterly Gamma Spectral Analysis Airborne Radioiodine Weekly Iodine-131 Terrestrial Monitoring Milk Monthly Gamma Spectral Analysis &

Semi-Monthly when animals are on pasture Iodine-131 Broadleaf Vegetation Monthly during growing season Gamma Spectral Analysis &

Iodine-131 Aquatic Monitoring Drinking Water Monthly Gross Beta Activity

& Gamma Spectral Analysis Quarterly Tritium Activity Surface Water Monthly Gamma Spectral Analysis Quarterly Tritium Activity Fish Annually if seasonal.

Semi-Annually if not seasonal.

Gamma Spectral Analysis Sediment Semi-annually Gamma Spectral Analysis Direct Radiation Monitoring TLD Quarterly &

Gamma Dose Annually 5.2 Sampling Changes There have been two changes made to the REMP sampling program in 2024.

A garden participant at Location #2 (previously labeled as Kanda Residence) is no longer participating in the program due to moving and selling their home. The participant notified PNPP in June of 2024 that they would be unable to continue to participate in the program any further.

This prompted the second change; a site boundary garden was established in June of 2024 - Location #7 Site Boundary NE. This is the highest X/Q available site boundary location that is not completely covered in woodland foliage. Due to the site boundary garden being established so late into the growing season, vegetation was not mature until the September sampling event.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 15 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant 6.0 ATMOSPHERIC MONITORING Air sampling is conducted to detect any increase in the concentration of airborne radionuclides. The PNPP REMP maintains an additional two air sampling locations above the five locations (four indicators and one control) required by the ODCM. Six of these locations are within four miles of the plant site; the seventh is used as a control location and is eleven miles from PNPP.

Air sampling pumps draw continuous samples at a rate of approximately two cubic feet per minute. The air is drawn through glass fiber filters to collect particulate material and a charcoal cartridge to adsorb iodine. The samples are collected on a weekly basis, 52 weeks a year, from each of the seven air sampling stations.

Air samples are analyzed weekly for gross beta activity and radioiodine activity. The air samples are also analyzed by gamma spectral analysis quarterly. A total of 364 air particulate and 364 air radioiodine samples were collected and analyzed.

Gross beta activity was detected in 364 of the 364 air samples. The average gross beta activity for the indicator locations was 0.024 pCi/m3 and the control was 0.024 pCi/m3.

Historically, the concentration of gross beta in air has been essentially identical when averaging all indicator and control locations. Figure 5 reflects the average gross beta activity for the highest indicator location vs the control location for 2024 and previous years.

Except for naturally occurring beryllium-?, no radionuclides above the LLD values were identified in the quarterly gamma spectral analysis. All radioiodine samples were less than the lower limit of detection for iodine-131.

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Year Indicator Control Figure 5: Air Particulate Gross Beta Comparison of Current Year and Historic Data Air particulate and gross beta results from 2024 were similar compared to preoperational data as shown in Figure 5 and Table 3 There were no significant changes in baseline.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 16 of 82 Company: Vistra Plant: Perry Nuclear Power Plant Table 3: Air Particulate Gross Beta Comparison of Current Year and Historic Data Pre-Operational (pCi/m3) 2024 Sample Result Average (pCi/m3) 0.023 0.027 7.0 TERRESTRIAL MONITORING Collecting and analyzing samples of milk (when available) and broadleaf vegetation provides data to assess the build-up of radionuclides that may be ingested by humans.

The historical data from soil and vegetation samples provides information on atmospheric radionuclide deposition.

7.1 Milk Since the milk sampling locations do not meet the requirements of the ODCM (no milk-producing animals are located within the required distance), broadleaf vegetation sampling (discussed below) is performed by PNPP. Milk was collected from the available locations to augment vegetation sampling until Spring 2018.

7.2 Broadleaf Vegetation Because there is not a milking animal within 5 km of the plant, PNPP samples broadleaf vegetation as required by the ODCM. These samples are collected monthly during the growing season from three resident gardens in the vicinity of PNPP, one site boundary garden in the highest available prevalent wind direction, and one control location 16.2 miles SSW from PNPP.

Seventy (70) samples were collected and analyzed by gamma spectral analysis. Four vegetation types were grown and collected: collard greens, turnip greens, kale, and Swiss chard. Beryllium-7 and potassium-40, both naturally occurring radionuclides, were found in the samples. No other radionuclides were detected.

The number of samples increased from those obtained during the 2023 growing season due to participants having better success this growing season with Swiss chard.

The garden at Location #7 was established when PNPP was notified of the residents maintaining the garden at Location #2 moving and leaving the program. Due to the late establishment and planting of the garden in June 2024, the garden yielded only two months worth of samples due to the limited growing season caused by late planting.

8.0 AQUATIC MONITORING Radionuclides may be present in Lake Erie from many sources other than the PNPP.

These sources include atmospheric deposition, run-off, soil erosion, and releases of radioactivity in liquid effluents from hospitals, universities, or other industrial facilities.

These sources provide two forms of potential radiation exposure: external and internal.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 17 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant External exposure can occur from contact with water or shoreline sediments, while internal exposure can occur from either direct ingestion of radionuclides or the transfer of radionuclides through the aquatic food chain. Direct exposure can occur through ingestion by drinking the water, while the transfer via the aquatic food chain occurs from the eventual consumption of aquatic organisms, such as fish. PNPP samples water, shoreline sediments, and fish to monitor these pathways.

8.1 Water Water is sampled from five locations along Lake Erie in the vicinity of the PNPP as required by the PNPP ODCM when available and as weather permits. Sixty (60) monthly composite samples were collected and analyzed for gross beta activity and gamma spectral analysis. Aliquots from the monthly composites are combined to form quarterly composites which are then analyzed for tritium.

Gross beta activity was detected in 37 of the 60 samples collected. The indicator with the highest annual average gross beta activity was 1.6 pCi/L and the control average gross beta activity was 1.4 pCi/L. Refer to Figure 6 for the annual average gross beta activity for both the highest indicator and control locations. No gamma activity was detected in any of the 60 samples collected. Of the 20 quarterly composite samples zero (0) samples showed detectable tritium activity. Any positive result less than 500 pCi/L is considered as background activity and not due to plant operations.

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N Sampling shoreline sediments provides an indication of the accumulation of particulate radionuclides which may lead to an external radiation source to fishermen and swimmers from shoreline exposure. Sediment was sampled from two locations, one location west of PNPP and the other east of PNPP, twice a year in the spring and the fall. A total of four sediment samples were collected and were analyzed by gamma spectroscopy. The only radionuclide detected was naturally occurring potassium-40.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 18 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant 8.3 Fish Fish are analyzed primarily to quantify the radionuclide intake by humans and secondarily to serve as indicators of radioactivity in the aquatic ecosystem. Fish are collected from two locations annually during the fishing season as required by the ODCM. Important sport or commercial species are targeted, and only the fillets are sent to the laboratory for analysis.

Eight (8) fish samples were collected and analyzed: five (5) indicator and three (3) control samples. The species analyzed included walleye, yellow perch, and white perch.

Only naturally occurring potassium-40 was detected in these samples.

The number of samples obtained in 2024 decreased from that obtained in 2023. The boat used in previous years for gill net placement for wide species net casting sank and was not available in 2024. Commercial charter fishing was used in 2024 to target sport and commercial species. Primary sport and commercial fish species per the Ohio Department of Natural Resources were still obtained and sent off for analysis.

9.0 DIRECT RADIATION MONITORING Environmental radiation is measured directly at twenty-seven (27) locations around the PNPP site and at two (2) control locations using thermoluminescent dosimeters (TLDs).

The locations are positioned in two rings around the plant as well as at the site boundary. The inner ring is within a one-mile radius of the plant site; the outer ring is four to five miles from the plant. The control locations are over ten miles from the plant in the two least prevalent wind directions. Each location has three TLDs, two of which are changed quarterly, and one that is changed annually.

A total of two hundred sixty-one (261) TLDs were collected and analyzed. This includes two hundred thirty-two (232) collected on a quarterly basis and twenty-nine (29) collected annually. Annual TLDs are not required per the ODCM and are used for supplemental data only. The annual average dose for all indicator locations was 61.5 mrem versus 56.4 mrem for the control locations. Average quarterly dose for the indicator locations was 14.4 mrem versus 14.2 mrem for the control locations (Figure 7).

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Year Indicator Control Figure 7: Average Quarterly TLD Dose

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 19 of 82 Company: Vistra Plant: Perry Nuclear Power Plant

10.0 CONCLUSION

There are no discernable trends or increases in radiological parameters when comparing current monitoring results to pre-operational studies. Non-routine analyses were not required during this reporting period. There is no detectable radiological effect on the surrounding environment due to operation of the Perry Nuclear Power Plant.

11.0 INTER-LABORATORY CROSS-CHECK COMPARISON PROGRAM The purpose of the Inter-laboratory Cross-Check Comparison Program is to provide an independent check on the vendor laboratory's analytical procedures. Samples with a known concentration of specific radionuclides are provided to the vendor laboratory. The vendor laboratory measures and reports the concentration of specified radionuclides.

The known values are then compared to the vendor results. Results consistently outside established acceptance criteria indicate a need to check instruments or procedures.

Regulatory Guide 4.15 [7] specifically requires that contractor laboratories that performed environmental measurement participate in the EPAs Environmental Radioactivity Laboratory Inter Comparison Studies Program, or an equivalent program.

The EPAs program is no longer funded or offered. The reason that the EPA program was referenced in the regulatory guide is that the EPA standards were traceable to National Bureau of Standards (now known as National Institute of Standards and Technology, NIST). In response, the vendor lab incorporated a program offered by Environmental Resource Associates (ERA), which covered the same analyses in the same matrix at the same frequency as the EPA program. ERA has received NIST accreditation as an equivalent program. In addition to comparison cross checks performed with ERA, the vendor laboratory routinely monitors the quality of their analyses by analyzing "spiked" samples (samples with a specific quantity of radioactive material present in them) and participating in the Department of Energys Mixed Analyte Performance Evaluation Program (MAPEP).

See Attachment 1 for the vendor Inter-Laboratory Cross-Check Comparison Program Results.

12.0 LAND USE CENSUS EXPOSURE PATHWAY To estimate radiation dose attributable to operation of the PNPP, the potential pathways through which public exposure can occur must be known. To identify these pathways, an Annual Land Use Census is performed as part of the REMP. During the census, PNPP personnel travel public roads within a five-mile radius of the plant to locate key radiological exposure pathways. These key pathways include the nearest resident and nearest garden in each of the ten meteorological land sectors that surround the plant.

The information obtained from the census is entered into a computer program used to assess hypothetical dose to members of the public. The predominant land use within the census area continues to be rural and/or agricultural.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 20 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 12.1 Introduction Each year a Land Use Census is conducted to identify the locations of the nearest available milking animal, garden (of greater than 500 square feet), and residence in each of the meteorological sectors that is over land. Information gathered during the Land Use Census is used for off-site dose assessment and to update sampling locations for the REMP. The census is conducted by traveling all roads within a five-mile radius of the plant site and recording and mapping the locations of the nearest resident, available milk animal, and vegetable garden.

The Land Use Census was conducted in July 2024. The census identified the garden, and residence locations identified in Table 4 and Table 5 that are depicted in Figure 8.

Note that the W, WNW, NW, NNW, N, and NNE sectors extend over Lake Erie and are not included in the survey. No location with an available milking animal was identified.

12.2 Discussion and Results In general, the predominant land use within the census area continues to be rural/

agricultural. In recent years, however, it has been noted that areas of land once used for farming are now being developed as mini-industrial parks and residential housing. This is reflected in the loss of available milking animals within a five-kilometer radius of PNPP to support the REMP.

There was one change in the 2024 Land Use Census, a site boundary garden was implemented at Location #7 in the NE direction. This became the closest garden for that sector direction and therefore changed the Land Use Census. Table 5 and Figure 8 have been updated to reflect this new garden location. Refer to Figure 2, Figure 3, and Figure 4, for the REMP sampling locations.

Table 4 identifies the nearest residences, by sector, to the PNPP. There were no changes from the 2023 Land Use Census regarding nearest residence by sector. Refer to Figure 8 for map locator numbers.

Table 4: Nearest Residence - By Sector Sector Location Address Miles from PNPP Map Locator Number NE 2348 W. Hemlock 0.9 11 ENE 2452 Antioch 1.1 12 E

2634 Antioch 1.1 10 ESE 2836 Antioch 1.1 4

SE 4671 North Ridge 1.3 15 SSE 4225 Red Mill Valley 1.1 16 S

3121 Center Rd.

0.9 7

SSW 3850 Clark 0.9 8

SW 3021 Perry Park 1.3 13 WSW 3460 Parmly 1.0 14

Annual Radiological Environmental Operating Report YEAR: 2024 Page 21 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 5 lists the nearest gardens by sector to the PNPP consisting of at least 500 square feet. Refer to Figure 8 for map locator numbers.

Table 5: Nearest Garden - By Sector Sector Location Address Miles from PNPP Map Locator Number NE Site Boundary 0.6 1

ENE 4602 Lockwood 1.1 2

E 2626 Antioch 1

3 ESE 2836 Antioch 1.1 4

SE 4495 North Ridge 1.3 5

SSE 3119 Parmly 0.9 6

s 3121 Center 0.9 7

SSW 3300 Ohio St.

2.3 17 SW 2997 Perry Park 1.2 9

WSW 3460 Parmly 1

14 13',.,

c:,

C'6 Ct,..

C:11 Cl Figure 8: Land Use Census Map

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 22 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 13.0 ANNUAL ENVIRONMENTAL OPERATING REPORT The NRC issued Amendment No. 178 to Facility Operating License No. NPF-58 on October 19, 2017. This amendment revises the PNPP Environmental Protection Plan (Non-radiological) (EPP) to clarify and enhance wording to remove duplicative or outdated program information, and to relieve the burden of submitting unnecessary or duplicative information to the NRC.

As a result of the above Amendment issued in October 2017, redundant program information is no longer required to be compiled and included in this report. This includes the sections: Clam/Mussel Monitoring, Herbicide Applications, and Special Reports which included National Pollutant Discharge Elimination System Permit exceedances, and the EPP from previous years.

14.0 ODCM NON-COMPLIANCES Sampling and analysis are performed for media types addressed in the Offsite Dose Calculation Manual. ODCM non-compliances occur when a sample required by the ODCM is not obtained and/or analyzed.

Sampling and analysis challenges may be experienced due to a multitude of reasons including environmental factors, loss of TLDs, contamination of samples, etc. To aid classification of sampling and analysis challenges experienced in 2024, the following three terms are used to describe the issues: Sample Anomalies (SA), Sample Deviation (SD), and Unavailable Samples (US).

Media that experienced downtime (i.e., air samplers or water samplers) during a surveillance period are classified a Sample Deviation (SD).

Sample Anomalies (SA) are defined as errors that were introduced to a sample once it arrived in the laboratory or errors that prevent the sample from being analyzed as it normally would or may alter the outcome of the analysis (i.e., cross contamination, human error).

Sample Unavailability (US) is defined as sample collection evolution with no available sample (i.e., food crop, TLD, frozen lake).

14.1 Non-Compliances There were no ODCM non-compliance events during the 2024 REMP year.

14.2 Sampling Challenges There was sample unavailability (US) at the site boundary garden at Location 7 for vegetation due to late planting during the growing season. Late planting was a result of late notification of an existing participant leaving the program and the resultant need to identify a new location that was not fully wooded that met ODCM requirements for prevalent sectors.

Sample Deviations (SD) occurred at several air sample collection pump stations.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 23 of 82 Company: Vistra Plant: Perry Nuclear Power Plant Sample Location #3 experienced a total pump, keypad, and turbine failure upon stopping air sample collection during the week of April 4, 2024. The pump would not restart after the filter change-out. No samples were missed; rather, there was a delay in restarting the sample collection at this location while a new pump, keypad, and turbine was installed later that day. This event was included in this report as a part of program maintenance.

For Sample Location #1 a reduction of run time spanning from the end of the week of May 14, 2024, into the beginning of the week of May 22, 2024, was due to pump failure.

This caused a reduction in sample collection time for that period. The pump was repaired and placed back in service.

Sample Locations #3 and #7 experienced a sample deviation (SD) that was identified on August 12, 2024. The pumps lost power due an area power outage. Plant maintenance personnel responded to the sample station and determined the cause be an issue with the circuit breaker. Power was restored to the sampler station. Once power was restored to the air sampler huts, the air samplers auto started without issue. Sampling run time met LLDs and is not a classified as a missed ODCM sample.

Sample Location #3 experienced power loss to the sample station during the week of Sept 12, 2024. Plant maintenance personnel responded to the sample station and determined the cause be an issue with the circuit breaker. Power was restored to the sampler station. This event resulted in a slight reduction in collection time for the continuous sampling. On the week of October 2, 2024, a lower sample volume was noted again due to loss of power from the same breaker issue, resulting in a second sample deviation in slightly reduced run time for the sample station.

15.0 CORRECTIONS TO PREVIOUS REPORTS There were no corrections identified for previous reports.

16.0 BIBLIOGRAPHY

1.

Japan Atomic Energy Agency. [Online] November 06, 2021.

https://www.jaea.go.jp/english/04/ntokai/houkan/houkan_02.html.

2.

Measurements of Radionuclides in the Environment Sampling and Analysis of Plutonium in Soil. s.l. : Nuclear Regulatory Commission, 1974. ADAMS Accession No. ML003739541.

3.

NUREG-1302, Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors,. s.l. : Nuclear Regulatory Commission, April 1991. ADAMS Accession No. ML091050059.

4.

NUREG-1301, Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors,. s.l. : Nuclear Regulatory Commission, April 1991. ADAMS Accession No. ML091050061.

5.

NRC Resource Page. [Online] [Cited: November 10, 2021.]

http://www.nrc.gov/about-nrc/radiation.html.

6.

NUREG-0133, Preparation of Effluent Technical Specifications for Nuclear Power Plants. s.l. : Nuclear Regulatory Commission, 1987. ML091050057.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 24 of 82 Company: Vistra Plant: Perry Nuclear Power Plant

7.

Regulatory Guide 4.15, Quality Assurance for Radiological Monitoring Programs (Inception through Normal Operations to License Termination) -- Effluent Streams and the Environment. s.l. : Nuclear Regulatory Commission, July, 2007.

ML071790506.

8.

ANSI 13.37, Environmental Dosimetry-Criteria for System Design and Implementation. s.l. : Health Physics Society (HPS), May, 2019.

9.

Branch Technical Position, Revision 1. s.l. : NRC000096, Submitted March 30, 2012, November 1979.

10. Regulatory Guide 4.1, "Radiological Environmental Monitoring for Nuclear Power Plants", Revision 2. s.l. : Nuclear Regulatory Commission, 2009. ADAMS Accession No. ML091310141.

11. Regulatory Guide 4.13, Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications, Revision 2. s.l. :

Nuclear Regulatory Commission, June, 2019. ML19044A595.

Annual Radiological Environmental Operating Report YEAR: 2024 Page 25 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant : Inter-Laboratory Cross Check Comparison Program Results

©)MICROBAC 700 L4'lCl.,r~r Ro,d

• Nurthbroo~. ll f,OO<;J J }1()

pf._,,,. 184 7) ~64-0100

• I (8U) 5M *~17 APPENDIX A INTERLABORATORV AND INTRALABORATORV COMPARISON PROGRAM RESULTS NOTE Appendtx A Is updated IOLW llmes a yeai. The complete appendUI 1s 1nduded to March.

June, September and December monthly progress reports only Octobet. 2023 thlough September. 2024

Annual Radiological Environmental Operating Report YEAR: 2024 Page 26 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Appendix A lnter1aboratory/ lntralaboratory Comparison Program Results Microbac Laboratories - Northbrook (previously Environmental Inc.) has participated in interlaboratory comparison (crosscheck) programs since the formulation of its quality prog.ram in December 1971.

These programs are operated by agencies and/or companies which supply en\\ltronmental sample types containing concentrations of radionuclides knoWTI to the issuir-.g entity but not to participant laboratories.

The purpose of sucfl a program is to provide an independent check on a laboratory's analytical procedures and to alert it of any possible problems.

Participant laboratories measure the concentration of specified radionuclides and report them to the issuing agency. &:veral months later, the agency reports the known values to the participant laboratories and specifies control limits. Results consistently higher or lower than the known values or outside the control limits indicate a need to check the inslruments or procedures used.

Results in Table A-1 were obtained through participation in the RAD PT Study Proficiency Testing Program administered by Environmental Resource Associates, serving as a replacement for studies conducted previously by the U.S. EPA Environmental Monitoring Systems Laboratory, Las Vegas, Nevada.

Table A-2 lists results for thennoluminescent dosimeters (TLDs), via irradialion and evalualion by the University of Wisconsin-Madison Radiation Calibration Laboratory at the University of Wisconsin Medical Radiation Research Center.

Table A-3 lists results of the analyses on intralaboratory *spiked" samples for the past twelve months. All samples are prepared using NIST traceable souroes. Data for previous years available upon request.

Table A-4 lists results of the analyses on intralaboratory "blank' samples for the past twelve months. Data for previous years available upon request Table A-5 lists analytical results from the intralaboratory "duplicate" program for the past twelve months. Acceptance is based on each result being within 25% of the mean of the two results or the two sigma uncertainties or each result overlap.

The results in Table A-6 were obtained through parlicipalion in the Mixed Analyte Performance Evaluation Program.

Results in Table A-7 were obtained through participation in the MRAD PT Study Proficiency Testing Program a!lministered by Environmental Resource Associates, serving as a replacement for studies conducted previously by the Environmental Measurement Laboratory Quality Assessment Program (EML}.

Attachment A lists the laboratory acceptance criteria for various analyses.

Out-of-limit results are explained directly below the result.

A-1

Annual Radiological Environmental Operating Report YEAR: 2024 Page 27 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Analysis Gamma Emitters Strontium-89.

Strontium-90 Potassium-40 Gross alpha Gross beta Tritium Radium-226.

Radium-228 Plutonium lo<fine-129, lo<fine-131 Nickel-63, Teclmeti um-99.

Uranium-2l8 lron-55 Other Analyses Attachment A ACCEPTANCE CRITERIA FOR INTRALABORA TORY "SPIKED' SAMPLES Ratio or lab result to known value.

0.8 to 1.2 0.8to 1.2 0.8 to 1.2 0.5 to 1.5 0.8 to 1.2 0.8to 1.2 0.7 to 1.3 0.8to 1.2 0.8to 1.2 0.7 to 1.3 0.8to 1.2 O.Sto 1.2 A-2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 28 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant T"8LE~1. **,t,;rteliora1c,ry Cc11r1p1ui,o~ C1<>!<!1el1eck pa:,grarr,. Bl orimeslital R..;oorce Mweiat.e,i ERA)*.

,RAD* !llui!y c:o11ce-t,1raoor, iecut.j Ulb Codi!'

Date Anatr,i, LaiXi<ato,y ERA Acoepli!li()i!'

Rjo!l!Sl Value lil'liit!:

Accee1a1"<;e, RAD*622724M (study dates 2/27124

• l/11124>

ERDW-323 10J7J'2022 Ba-133 67 l i 4 1 79.4 62 l

• 97.0 Pa,;s E.RD'l'i-l23 1(117/2022

~ -134 20.6.t 2.6 30 S 111.2. 42.a P.a,;s ERDW,323 1(117/2022

~-137 2:.11.t 7 212 172

• 25,2 Pa,;-s E.RO'l'r-323 1(117/2022 co-6D 48.!I.t 4 2 S.1-4 37.1.. 6S...7 P.li!>!l E.RDW,323 10,712022 Zr1~65 82 6.t 9 216 167

• 265 F '

ERDW,325 1(1171'2022 Gr. AJ~,a 15A.t 16 16 9 11.1 - 22.7 Pil!>!l ERDW-325 10!712022 G.Belii 48.2.t 1 4 530 39 1

• re.9 Pass ERD'l'r-321 10,7.1'2022 ru,,226 15.9.t0.9 19.0 16.2

• 21..B Fai<

ERDW-321 10,7/2022 R.a,22',8 381.t 1.04 2.3-l 1.04. 3.£0 Fai' E.RD\\"i.3:21 1(117/2022

Uranhin, 8.74S.t 1.070 11.S.l 7.10

• 10.0 Pas-s E.RD'i'r-327 4110/'2023

!i-3 12,740.t 366 12,700 10,500

• 14.900 Pa'11l RM>-137 51udy (sl.u!ly da'IM 4/08!'24

• 5.1'23124 )

EROW,715 4/&'"2024

!!a-133 71.2.!. S.S.

65.9 50.1 - 81.1 Pass E,ROW,715 41812024 Cs-134 70.4.i9..5 57.8 42.,8

• 7:H!

P:a!l\\S ERD'l'/*715 4l8,'2024

~ -137 11!;!!.t 11 186 149

• 233 Pass EROW,715 4l8t2024 Co-60 100.i 10 98.8 79.7 - 118 PaS!l E.RD'i'r*715 4/8.'2024 z,,,65 231.i 15 240 1M

• 29,!

Pass ERO'i'r,713 41812024 Gr. AJp',a 394 i 1.9 52 6 39 6

• 6S...8 Fai*

ERD'i'r

• 713 41812024 G.BE!lii 45 5 i 1.4 46 5

].3.9, 59.1 Pa" E.RO'i'r,711 41812024 Rs-226 14.l.tO!I 13.4 11.10 -15,.7 Pass E.RD'W-711 4/!!/2024 Rli-228 6.01.t 1.19 6.24 4.17

• B.31 Pass E.ROW,711 411!/2024 lJ:i:n'lii.ni1 63 5.t2.4 59 3 52.8

• 65.l!

PU1!

ERD'l'r-717 4/812024 li-3 20,400 i 448 21,300 18,200.* 24 400 PaS1' RAD,138 Sludy (slu(!y da'li!'s 7/08/24, 8i22124 )

ERO'l'r,1-546 71812024 Ba-1 33 41.4.i -59

]8.2 25.2

• 51.2 Pa,;s E:ROW,1546 7/812024

~ -134 16 6-.i8.0 18 9 7.81

• 30.0 P.ass E.RO'l','.1546 71812024

~-137 54 4 i 13.3 57.0 329

• 81.1 Pa,;-s E-RD'l'r

• 1546 71812024 Co-60 82.8.t 7.1 76.8 59.9

• 93 7 Pass E.RD'l'i-1546 7,'B/2024 bHlS 348 i.JO 312 25]

• 371 Pa,i,s ERO'l'r,1546 711112024 G1.AJ~1a 9.05 i 1.26 130 7.94

• 18 1 p;;,i,-s E,RD'i'r-1548 71812024 G.!!elii 17 *] i 1.0 206 132 - 280 Pass E.ROW-1552 71'<!,'2024 R!i-22,;

20.4 i 1 0 17.2 14.6

• 19.il F.ail' ERD'W-1552 71812024 Ra,228 3.72 i 0.96 4.6]

2.88

• 6.3'!!

Pass ERDW-1552 711!12.024

!lJl&i'liJnl 36.2 i 2.4 36.8 3.25, 41.1 Pas1<

E.RD'i'r-1554 71812024 1-1-3 7,&40 i 29D 7,550 5,870

• 9,230 Pass E.RD'l'i

• 1550 71&'2024 1-131 20.1 i 0.9 27.9 24.2, 31.6 Fail"

• Aesut1s. obtuN!'d b~ MJCmbix l..ioar.l'!one5 lr,c.

• Nor1t.200k iM.1 p,ou~c1po11"J. m ~he crc.v!-sct<<k pragr.:rn for p-of1aer,:y lHtlr4;1 ;n d!'inkng -..'itter cor..o.Jv'led t'j 6r.1t1raTT1cr~ f<~ource As-socti:lle-S (E:RAJ.

, An 1ncorred relerencc !l;:ate Y.il:i ~eo 1n r..,e C-.JIDJL.1'.i.lX"l til the 9.1rrrn.1 ernt.::ers.. If tl"e care:, ti.ale Wil!. used,..ti ;,r..vyt.e wo.ild ha11e p;z~ca ERA ;x:,ceptz.-.ce ar.en.1 The 2n-&!. re,ail woul:I h*** t:<,,on 2 1, ~ 30 pC*'L

Na CO'tlllllt.ii COC-4C

IU5.:tn C-DUld be delcm1Ineo fa lt.ie kM rc~l tf':s pOZ!tle th.'ll ii ~rn-'I 11:;ik from eie r,.)joo b.bbler m..., 1111\\-e alowed '"dor go* ** e,;GJpe ;,e,et,y le<>:l"'3 ID the law tCS/Jh Sub5eq.JOnl ERA.,udy RA0-131 Pil**ed it>r R.> 2ZG

~ The tJ.iJtch recG\\'er't value.ars. c~~ned b'/ tt"'° [PA m~Dd ctud h.':t"oe been tl.Ji.Sed.1r"mciaty low lt.tS"eb'f c;:usmg the reoun ID t.a"'" high bias """"'de :tie "!'PC' o.,cep1anoo tmn Sub5eq.,ont ERA.,0011,, RA0-137 t 3i! pa....:I far Ri>-22&

• Data-~ revn:-.w::d bul nn OO'l'IDU5 t~J.Je could be-delcrmned.SU!Js,equer~ l::RA 5tll'tdy AA0,..138. ~sed tnr balh Gt<><-. Alpl\\O amt Groz &ta

' Tt~ km c.a,triue5 lo uwe5hgate ':'le f;b.:z-.M perlonnance IZ~!:i The procedure h.:1$ ~

l'e"t1:-.ed tD mn~.cbsdy fo(IDWi the l:PA me:ttoc. Aeslil:-. are betng comp(ed and il s,.bsequer1 IEAA !.iiluc'y lrM.11 be cc:Sered to 'J.11.l!:1.Jte -:ic re,~eo i:r--uct!CU"e.

1 l:R.A,;,j!Jec s~.e u:dr.,e r.arrt8 to ::ie P*T !.ilmpte,.n a canc~':'.1.ban of 0.20 mg,t The c.ilo.ta"ion of tt.t!' res~I?. lt.i1 were 5Ubrnt,ed fcf ll"'i !. !.":udy did 1'1)1 t.1te ~s ilCDed K>dne into ilGCCU"f'i -..rien c.alcci.:lirrig ~e c:hemiciJI yidC or recayery.

lr,:ocporatn;1 tt,,,e ERA ao:led stlble IOC'"ne, 1r;.o lhe Cillc,ulatb:Jr.t.; reOD\\'enes cropped trom l:IB. Tl~.ind 90 !&:.!~ l:J 154 !)6~ ano &1I1'll,. TneilqlMled f64J.ts.are 29 4.! pCL\\..inal:l8 OGp'.:::1.1L PM"<<:h ilre bo'tl.,11tun tt,e ac,ccpt.:ir.cer;,nge A-3

Annual Radiological Environmental Operating Report YEAR: 2024 Page 29 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-2. Them1oluminescent Dosimetry, (TLD. CaSO4 : Dy Cards)_*

mrem Lab Code Irradiation Delivered Reportedb Performance<

Date Descrie *on Dose Dose Quotient ! P}

Environmental, Inc.

Group 1 2022-23-3 11/29/2023 Spike 1 93.0 90.0

-0.03 2022-23-3 11/29/2023 Spike 2 93.0

&.5

-0.05 2022-23-3 11/29/2023 Spike 3 93.0 89.0

-0.04 2022-23-3 11/29/2023 Spike 4 93.0 89.5

-0.04 2022-23-3 11129/2023 Spike 5 93.0

&.1

-0.05 2022-23-3 11/29/2023 Spike 6 93.0 95.1 0_02 2022-23-3 11/29/2023 Spike 7 93.0 90.8

-0.02 2022-23-3 11/29/2023 Spike 8 93.0 90.8

-0.02 2022-23-.3 11/29/2023 Spike 9 93.0 92.3

-0.01 2022-23-3 11/29/2023 Spike 10 93.0 89.0

-0.04 2022-23-3 11/29/2023 Spike 11 93.0 84.9

-0.09 2022-23-3 11/29/2023 Spike 12 93.0 90.8

-0.02 2022-23-3 11/29/2023 Spike 13 93.0 92.0

-O.o1 2022-23-3 11129/2023 Spike 14 93.0 87.7

-0.06 2022-23-3 11129/2023 Spike 15 93.0

&.8

-0.05 2022-23-.3 11/29/2023 Spike 16 93.0

&.6

-0.05 2022-23-3 11/29/2023 Spike 17 93.0 84.2

-0.09 2022-23-3 11/29t2023 Spike 18 93.0

&.6

-0.05 2022-23-3 11129/2023 Spike 19 93.0 86.4

-0.07 2022-23-3 1112912023 Spike 20 93.0

&.3

-0.05 Mean (Spike 1-20) 89.2

-0.04 Pas'!ld Srandard Oe'Jiation (Spike 1-20) 2.5 0_03 Pas-s" a TLD's we-1e irradiated by the University of Wisoonsi n-MacflSOn Radiation Calibration Laboratory following ANSI N 13.37 pro!ocol from a !mown air ke-rma rate. TLO's v.-ere read and the resulls we-re submttted by Microbac Laboratories - Northbrook to the-Urriversity of W isconsirl-Mladison Radiation Calibration Laboratory lor comparison to the delivered dose_

b Reported dose was converted from exposure (R) lo Air Ke-rma (cGy} using a conversion of 0.876. Conversion from air kerrna to ambient do54! equivalent lor Cs-137 al the reference do54! point W( lO)K. = 1.20. mrem/cGy = lO0O.

c Performance Quotient (PJ is calculated as ((reported dose - con..,entionaDy true value) ~ conventionally lfue ~*alue) \\\\here the conventionally true value is the delivered close_

d Acceptance is achieved when neither the absolute value of lhe mean of the P values. nor the standard de..,iation of the P values e1CCeed 0. 15.

A-4

Annual Radiological Environmental Operating Report YEAR: 2024 Page 30 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-2. Th.ermoluminescent Dosimetry. (TLD, CaSO4. Dy Cards).0 mrem lab Code Irradiation De'livered Reported" Performance' Date Descri~lio111 Dose Dose Quotient ~Pl Environmental, Inc.

Group 2 2022-23-4 11129/2023 Spike 21 176.0 170.1

-0.03 2022-23-4 11129/2023 Spike 22 176.0 166.8

-0.05 2022-23-4 11129/2023 Spike 23 176.0 156.J

-0.11 2022-23-4 11129/2023 Spike 24 176.0 163.1

-0.07 2022-23-4 11129/2023 Spike 25 176.0 166.8

-0.05 2022-23-4 11129/2023 Spike 26 176.0 168.0

-0.05 2022-23-4 11129/2023 Spike 27 176.0 159.8

-0.09 2022-23-4 11/29/2023 Spike 28 176.0 160.4

-0.09 2022-23-4 11129/2023 Spike 29 176.0 165.

-0.06 2022-23-4 11129/2023 Spike 30 176.0 166.2

-0.06 2022-23-4 11/29/2023 Spike 31 176.0 159.9

-0.09 2022-23-4 11/29/2023 Spike 32 176.0 161.4

-0.08 2022-23-4 11/29/2023 Spike 33 176.0 165.8

-0.06 2022-23-4 11129/2023 Spike 34 176.0 163.9

-0.07 2022-23-4 11/29/2023 Spike 35 176.0 167.9

-0.05 2022-23-4 11129/2023 Spike 36 176.0 157.-di

-0.11 2022-23-4 11129/2023 Spike 37 176.0 165.6

-0.06 2022-23-4 1112912023 Spike 38 176.0 161.J

-0.08 2022-23-4 11/2912023 Spike 39 176.0 165.9

-0.06 2022-23-4 11129l2023 Spike40 176.0 159.4

-0.09 Mean (Spike 21-40) 163.6

-0.07 Pas-sd Standard Deviation (Spike 21-40) 3.9 0.02 Pass" a TLO's were irradia1ed by the Universily of Wisconsi n-Mad'ts.0n Rad'iation Ca ibration Laboratory follo'Ning ANSI N 13.37 protocol from a.lmo'Nll air karma rate. TLO's were read and the reslJlls V.'Bre submi11.ed by Microba,c; Laboratories - Nor1Hbrook to the University of W iswnsin-t.\\adison Radiation Calibration Laboratory for comparison to the delivered dose.

b Reported dose wa-s converted from exposure (R) lo Air Kenna (cGy) using a conversion of 0.876. Conversion from air kerma to ambient dose equivalent for Cs-137 al the reference dose point W( tO)K,. = 1.20. mremlcGy = 1000.

c Performance Quotient {Pl is calculated as ({reported dose - con\\*en1ionally Crue value).,. convenlionally true value} -.mere lhe c;onven!ionally true value is the delivered dose.

d Acceptance is achieved When neither the absolute value of the mean of lhe P va ues, nor lhe standard de*~ia1ion of the P values ei;x;eed 0.15.

A-5

Annual Radiological Environmental Operating Report YEAR: 2024 Page 31 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-3. lntralaboratory 'Spiked" Samples Concentration*

Lab Code" Date Anafysis Laboratory resul1s Known Control Ratio 2s1 fF1L Activll~

Limits" Accee!!noe Lab/Known SPDW-50316 1013/2023 H-.3 21,400 +/-454 22,100 17,680 - 26,520 Pass 0.97 SPW-50330 1111712023 li-3 21,143 +/-5.43 22,100 17,680 - 26,520 Pass 0.96 LCS-S0-112823 8/112020 Cs-134 17.2 +/- 0.2 192 15.4 -23.0 Pass 0.90 LCS-S0-112823 8/112020 Zn-65 14.9 +/-3.1 14.1 11.3 - 16.9 Pass 1.06 LCS-SO-1 12823 8/112020 Co-60 26.0 +/-0.3 27.0 21.6 - l2.4 Pass 0.96 LCS-S0-112823 8/112020 Co-57 29.3 +/-0.9 30.9 24.7 - 37.1 Pass 0.95 LCS-S0-112823 8/112020 Mn-54 17.5 +/- 1.3 16.5 13.2 - 19.8 Pass 1.06 LCS-S0-112823 8/112020 K~O 18.0 +/- 0.7 16.8 13.4 -20.2 Pass 1.07 SPW-3908 1211812023 Nl-63 2,032 +/- 27 1.7811 1,430 - 2,146 Pass 1.'14 SPW-3910 1211812023 Fe-55 269 +/-24 232 186 - 278 Pass 1.16 SPDW-50378 1211912023 li-3 21,102 +/-452 22,100 11,680 - 26,520 Pass 0.95 SPDW-50388 1212812023 li-3 20,540 +/- 445 22,100 17,680 - 26,520 Pass 0.93 SPDW-50393 12119/2023 Ra-226 11.6 +/- 0.3 12.3 8.6 - 16.0 Pass 0.94 SPDW-60025 1112/2024 Gr. Alpha 4.3.3 +/- 2.4 47.9 24.0 - 57.5 Pass 0.90 SPDW-60025 1/12/2024 Gr. Beta 28.9 +/- 1.3 28.6 22.9 - 34.3 Pass 1.01 SPDW-60042 21212024 li-3 21.225 +/- 459 22,100 17,680 - 26,520 Pass 0.96 SPDW-60059 2114/2024 Gr. Alpha 37.6 +/- 2.8 322 16.1 - 38.6 Pass 1.17 SPDW-60059 2114/2024 Gr. Beta 168 +/-3 160 128.0 - 192.0 Pass 1 05 SPDW-60067 2113.12024 li-3 20,925 +/- 451 22,100 17,680 - 26,520 Pass 0.95 SPDW-60097 2128/2024 Gr. Alpha 27.7 +/- 2.1 322 16.1 - 38.6 Pass 0.86 SPDW-60100 2126/2024 li-3 21,582 +/-462 22,100 17,680 - 26,520 Pass 0.98 SPDW-60016 3.'712024 li-3 20,572 +/- 449 22,100 17,680 - 26,520 Pass 0.93 SPDW-60133 3/14/2024 Gr. Alpha 23.6 +/-2.1 322 16.1 - 38.6 Pass 0.73 SPDW-60133 3/14/2024 Gr. Beta 171 +/-3 160 128 - 192 Pass 1.07 SPDW-60150 3!22/2024 li-3 20,618 +/- 450 22,100 17,680 - 26,520 Pass 0.93 SPDW-60191 3/21/2024 Ra-226 13.2 +/- 0.4 12.3 8.6 - 16.0 Pass 1.07 SPDW-60154 3125/2024 Ra-228 12.7 z 1.6 15.4 10.8 - 20.0 Pass 0.82 LCS-W-052924 4181202'1 Ba-133 55.7+/-4.3 65.9 52.7 - 79. 1 Pass 0.85 LCS-W-052924 41812024 Cs-134

!:I0.1 +/- 3.4 57.8 46.2 -69.4 Pass 0.87 LCS-W-052924 41812024 Cs-137 172 +/-6 186 149 - 223 Pass 0.92 LCS-W-052924 41812024 Co-60 95.3 +/- 4.0 98.8 79.0-119 Pass 0.96 LCS-W-052924 41812024 Zn-65 224 +/- 12 240 192 - 288 Pass 0.93 SPDW-60184 41912024 Gr Alpha 21.0 z2.0 322

16. 1 - 38.6 Pass 0.65 SPDW-60184 419/2024 Gr. Beta 1S8 +/-3 160 128.0 - 192.0 Pass 0.99 SPDW-60198 4/ 15/2>D24 li-3 20,822 +/- 453 22,100 11.eao -26,520 Pass 0.94 SPDW-60213 4/2512::124 Ra-228 15.4 +/- 2.0 15.3 10.7 - 19.9 Pas!'>

1.01 SPDW-60215 4126/2024 li-3 20,400 +/- 447 22,100 11.eao -26,S20 Pass 0.92 SPDW-60267 4/11/2::124 Ra-22-s 10.8 +/- 0.3 12.3 8.6 - 16.0 Pass 0.88

• Liquid sample resul!s are, eported in pCill iter air fitters ( pCLim3), charcoal (pCilcherco canister), and !'>Olid i;amples (pCilkg).

" Labora.tory codes : W & SPW (Water). Ml (milk). AP (air filter), SO (soil). VE (vegelabon). CH (Charcoal canister). F (fish). U (urine).

' Results ere based on -single determinations.

• Acceptance criteria are listed in Atla.chment A of !his report A-6

Annual Radiological Environmental Operating Report YEAR: 2024 Page 32 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-3. l.ntralabOlatory "Spiked" Sam pies Concentration*

lab Code" Date Analysis labOfatary resul1S l<ncrwn Cootrol Ratio 2s. rF1 c Adi~

Limits" Accee1ance lab,'l<nov.n SPDW-60236 5/1012024 H-3 2Q41.S +/- 448 22,10:l 17,680 - 26,520 Pass 0.92 SPDW-60253 5116/2024 R.a-228 13.6 +/- 1.8 15.3 10.7 - 19.9 Pass 0.89 SPDW-60002 5129/2024 Gr. Alpha

18. 1 +/- 1.7 322 16.1 -38.6 Pass 0..56 SPDW-60002 5129/2024 Gr. Beta 163 +/-3 100 128 - 192 Pass

• 1.02 SPDW-60307 5/23/2024 R.a-226 13.0 +/-0.S 12.3 8.6 -16.0 Pass 1.05 SPDW-60294 5128/2024 H-3 20.840 +/-463 22,100 17,680 - 26,520 Pass 0.94 SPDW-60314 6161202'1.

R.a-228 11.9 +/- 1.6 15.3 10.7 - 19.9 Pass 0.78 SPDW-60331 6110/2024 H-3 20.602 +/- 459 22,100 17,680 - 26,520 Pass 0.93 SPDW-60357

.S/'30/2024 Ra-226 11.8 +/-0.4 12.3 8.6 -16.0 Pass 0.96 SPD'i\\J-60361 6127/2024 Gr. Alpha 21.7 +/-2.0 322 16.1 - 38.6 Pass 0.67 SPDW-603.G1 6127/2024 Gr. Beta 151 +/-2 100 128 - 192 Pass 0.94 SPDW-60425 6/2412024 Ra-226 12.8 +/-0.4 12.3 8.6 - 16.0 Pass 1.04 SPDW-60393 7/10/2024 H-3 20.368 +/- 454 22,100 17,680 - 26,520 Pass 0.92 SPDW-60411 7/2212024 Gr. Alpha 18.2 +/- 1.9 322 16.1 -38.6 Pass 0..57 SPDW-60411 7/2212024 Gr. Beta 15-5 +/-3 100 128 - 192 Pass 0.97 SPDW-604.52 7/31/2024 Ra-226 11.S+/-0.4 12.3 8.6 -16.0 Pass 0.93 SPDW-60530 8/1212024 Ra-226 12.3 +/- 0.4 12.3 8.6 - 16.0 Pass 1.00 LCS--OB.126!'24 7,181202-1 Ba-133 31.2 +/-4.3 382 31 -0,046 Pass 0.82 LCS-08/26/24 7,'812024 Cs-134 22.0 +/-3.0 18.9 15 -0,023 Pass 1.16 LCS-08/26!'24 71812024 Cs-137 6-!l.O +/- 6.5 57.0 46 -0,008 Pass 1.19 LCS--08./26!'24 71812024 Co-60 00.8 +/-5.0 76.8 61 -0,092 Pass 1.05 LCS--OB.126124 718/2024 Zn-65 337 +/- IS 312 250 -0,374 Pass 1.08 LCS-S-09\\'04/24 311912018 Ac-228 1, 122 +/- 120 1,240 992 -1,488 Pass 0.90 LCS-S-09,'04/24 3119/2018 Bi-212 1; 105 +/-293 1,240 992 - 1,488 Pass 0.89 LCS-S-091'04/24 311912018 Bi-214 1.563 +/-49 1,700 1,408-2,112 Pass 0.89 LCS-S-09104.124 3119/20*18 Co-60 7.251 +/- 94 8,000 6,448 - 9,672 Pass 0.90 LCS-S-09.'04/24 3119/2018 Pb-214 1.489 +/- 5,4 1,850 1,480 - 2,220 Pass 0.80 SPDW-60627 9/1012024 H-3 20.297 :1:453 22,100 17,680 - 26.520 Pass 0.92 SPDW-60546 9/1312024 S-90 15.9 +/- 1.0 15.A 12.3 - 18.5 Pass 1.03 SPDW-605-59 9125/2024 Gr. Alpha 7.5 +/- 1.1 13.0 6.S - 1S.6 Pass D..58 SPDW-605-59 912.5/2024 Gr. Beta 21.S +/- 1.3 20..G 16 -25 Pass 1.04 LCS-W-090324 41812024 Ba-133 65.S +/- 5.8 65.9 5 79 Pass D.99 LCS-W-090324 41B12024 Cs-134 S4.5 +/-5.1 S7.8 46 -69 Pass D.94 LCS-W-090324 4/B/2024 C.s-137 189 +/- 12 185 149 -223 Pass

• 1.02 LCS-W-000324 41812024 Co-60 101 +/- 9 98.8 79 - 119 Pass 1.02 LCS-W-000324 41B1202"1 Zn-65 260 +/-2S 240 192 -288 Pass

• 1.08

• liquid sample resul!s aie reported in pCi/Liter. air fillers ( pCA'm3 ), charcoal (pCilcharcoa! can1Ster).. and solid samples (pCilkg ).

" laboralorycodes : W & SPW (Waler), Ml (milk). AP (air filler), SO (soil).. VE {vegela~on).. CH (charcoal canister) F (fish), LI {urine).

L Results are based cm single determinations.

• Acceptance c.riteria are listed in Attachment A ol 1his report.

A-7

Annual Radiological Environmental Operating Report YEAR: 2024 Page 33 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A--3. Intra.laboratory 'Spiked" Samples Conoenlratian*

Lab Cade" Date Analyois Laboratory re-sulls Known Control Ratio

26. n.=1L ActiYi!;l:

Limits" Aooeetance LabJl<nown LCS-W-10/03J24 81112023 Cs-134 288 +/-5 305 24 366 Pass 0.94 LCS-W-1 Ol'03J24 81112023 Cs-137 257 +/-8 235 188 -282 Pass 1.00 LCS-W-10/03/24 81112023 Co-57 560 +/- 16 521

'417 -625 Pass 1.06 LCS-W-10/03.'24 81112023 Mn-54 364 +/- 16 343 274 -412 Pass 1.06 LCS-W-1 OW3l211 81112023 Zn-65 4S9 +/-28 516 413 - 619 Pass 0.95 LCS-W-10,'05/24 7/1212021 Ba-133 42.5 +/- 3.5 45.5 36 - 055 Pass 0.93 LCS-W-10/05J'24 7!1212021 Cs-134 88.1 +/-6.2 87.5 70 - 105 Pass 1.01 LCS-W-10/05J'24 711212021 Cs-137 219 +/-6 208 166 - 250 Pass 1.06 LCS-W-10/05J'24 711212021 Co-60 88.8 +/-5.1 87 1 70 - 105 Pass 1.02 LCS-AP-1 OfOb/'24 81112022 Cs-137 52.1 +/-2.0 47.5 38 - 057 Pass 1.10 LCS-AP-10/05/24 81*112022 Co-57 99.8 +/-6.5 94.5 76

• 113 Pass 1.06 LCS-AP-10!05i24 811/202'2 Co-60 59.9 +/- 2.1 57.0 46

• 068 Pass 1.06 LCS-AP-1 OfOb/'24 81112022 Mn-54 61.2 +/- 7.7 58.9 47

• 071 Pass 1.04 LCS-AP-10/05/'Z'1 81112022 Zn-65 43.1 +/- 13.5 49.4 40

• 059 Pass 0.87 SPDW~0584 10/9/2024 H-3 20,016 +/- 452 22,,00 17,680 - 26,520 Pass 0.91

• Liquid sample results are repooed in pCilliler. air fi ers ( pCJ/m3), dlarc-0at (pCi/charcoal canister), and sohd samples (pCi/kg).

• Laboratory codes : W & SPW (Water), Ml (milk). AP {air fi er), SO (soil), VE (vegetation), CH (charcoal canister), F (fish} U (urine).

' Results are based cm single determinations.

• Acceptance criteria are listi!d in Attad!ment A ol this report.

A-8

Annual Radiological Environmental Operating Report YEAR: 2024 Page 34 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-4. lnlralaboralory "Blank" Samples Cooo1mtra1ion LabCodeb Sample Dale Analysis" Laboral~ results !4,61kl-!

Acceptance Type LLD Ac.tivilf Crileria 14.IIB al SPDW-50218 Waler 8/1512023 Sr-8'9 0.00

-0.07 +/- 0.48 5

SPDW-50218 Waler B/15/2023 Sr-00 0.55 0.02 +/- 0.26 SPDW-50248 Waler B/'2212023 Gr. Alpha 0.57

-0.03 +/- 0.40 2

SPDW-50248 Waler 8/22/2023 Gr. Be1a 0.70 0.28 +/- 0.50 4

SPDW-50256 Waler Bi25/2023 H-3 161 75 +/- 84 200 SPDW-50258 Waler 7119/2023 Ra-226 O.OB

-0.25 +/- 0.04 2

SPDW-50270 Waler 916/2023 H-3 160 90 +/- 81 200 SPDW-50282 Waler 91'25/2023 H-3 163 53 +/- 79 200 SPDW-50290 Waler Bi281'202J Ra-226 0.05 0.00 +/- 0.04 2

SPDW-5031 1 Waler 10/16/2023 1-1 31 0.25 0.06 +/- 0. 14 SPDW-50312 Waler 10/Jl2023 Ra-226 0.04 0.06 +/- 0.09 2

SPDW-50315 Waler 101271202'3 H-3 16'9 5 +/- 79 200 SPDW-503:.29 Waler 11117/2023 H-3 170 51 +/-82 200 SPDW-50379 Waler 11117/2023 Ra-226 0.05 0.09 +/- 0.04 2

SPDW-50346 Wa!er 12/5,1'2023 H-3 0.10

-0.12 +/- 0.07 l

SPDW-50347 Waler 1215/2023 Ra-228 1.27

-0.07 +/- 0.62 2

SPW-3907 Waler 12/1812023 Ni..(l3 149 0 +/- 91 200 SPW-3909 Waler 121181202:J Fe-55 435 7 +/- 265 2000 SPDW-50377 Waler 1211912023 H-3 173

-42 +/- 78 200 SPDW-50Ja7 Waler 12i2812023 H-3 171

-21 +/- 79 200 SPDW-60024 Waler 1112/2024 Gr. Alpha 0.70 0.14 +/- 0.50 2

SPDW-60024 Waler 11121'2024 Gr. Beta 0.83

-0.60 +/- 0.56 4

SPW-3913 Waler 2/2.1202'1 Tc-99 11.8

-12.3 +/- 7.0 200 SPDW-60041 Waler 2/212024 H-3 177 68 +/- 00 200 SPDW-60058 Waler 2/141'2024 Gr. Alpha 0.51

-0.10 +/- 0.35 2

SPDW-6005B Wa!er 21141'2024 Gr. Ba1a 0.71 0.19 +/- 0.50 4

SPDW-60147 Waler 2121/2024 Ra-226 0.04 0.1B +/- 0.03 2

SPDW-60099 Waler 212612024 H-3 179

-89 +/- 84 200 SPDW-60097 Waler 2/28/2024 Gr. Alpha 0.53 0.29 +/- 0.39 2

SPDW-60097 Waler 2/28/2024 Gr. Bela 0.79

-0.42 +/- 0.54 4

SPDW-60141 Wal.er 3/1912024 1-131

0. 18

-0.10 +/- 0.10 1

SPDW-60149 Waler 3/2212024 H-3 174

-2 +/- 88 200 SPDW-60115 Waler 3/7/2024 H-3 175 20 +/- 115 200 SPDW-60129 Waler 3/11/2024 Ra-228 0.74 0.07 +/- 0.35 2

SPDW-60132 Waler 3114.12024 Gr. Alpha 0.51

-0.20 +/- 0.34 2

SPDW-60132 Waler 3114/2024 Gr. Bela 0.75

-0.07 +/- 0.52 4

SPDW-60190 Waler 3.1'21/2024 Ra-226 0.04

-0.14 +/- 0.03 2

SPDW-60155 Waler 3.12512024 Ra-228 1.46

-0.13 +/- 0.00 2

• u qu.a sample re"' s are reported III pC11uter, air tuter6 ( pC11'm3), charcoal ~charcoal caAtSl.e<J and solld samples (pCilg).

' Laboratory cod!!-s : w & SPW {Wat!!lf) Ml { nlllk), Al* (air fl!ler), so (s

), VE (vegeta11on), CH (charooal canls1er), F (fish), U iunne).

" 1-131 (G), IOOlne-131 as analyZe(I by gamma speclro~opy

• Ac1Mty ceport-M Is a net a011v,ty result.

A-9

Annual Radiological Environmental Operating Report YEAR: 2024 Page 35 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-4. lnlralaboratory "Blank" Samples LabCoct1l Sample Date Analysis" Labora!

Acc:eptanc:Et T

Et LLD Criteria 4.66 tJ SPDW-60183 Waler 4/9/2024 Gr. Alpha 0.66

-0.09 +/- 0.46 2

SPDW-60183 Waler 4,19/2024 Gr. Bela 0.76 0.1 1 +/- 0.54 4

SPDW-60266 Wahn 4/1 112024 Ra-226 0.04

-0.15 +/- 0.03 2

SPDW-60197 Waler 4/1 512024 H-3 174 53 +/- 84 200 SPDW-60212 Waler 4/2512024 Ra-228 0.90 0.03 +/- 0.42 2

SPDW-60214 Water 4/26.12024 H-3 170 27 +/- SO 200 SPDW-60235 Water 5/10/2024 H-3 174

-7 +/- 81 200 SPDW-60252 Wale-I 5/16.12024 Ra-228 0.68 0.72 +/- 0.39 2

SPDW-60294 Waler 512!112024 H-3 188

-43 +/- !18 200 SPDW-60295 Waler 512!112024 Sr-89 0.62 0.16 +/- 0.44 5

SPDW-60295 Waler 5/2!112024 Sr-90 0.66

-0.20 +/- 0.28 SPDW-60301 Waler 5/29.12024 Gr. Alpha 0.49

-0.16 +/- 0.33 2

SPDW-60301 Waler 5/29/2024 Gr. Bela 0.76 0.14 +/- 0.54 4

SPDW-60306 Wale-r 5l23l2024 Ra-228 0.17

-0.30 +/- 0.38 2

SPDW-60356 Waler 5/30/2024 Ra-226 0.04 0.12 +/- 0.03 2

SPDW-60313 Waler 6,16/2024 Ra-228 0.76

-0.0 1 +/- 0.35 2

SPDW-60l30 Waler 6/1 0/2024 H-3 183 12 +/- 116 200 SPDW-60340 Water 6/17/2024 1-1 31 0.15

-0.04 +/- 0.08 1

SPDW-60360 Waler 612712024 Gr. Alpha 0.46

-0.12 +/- 0.31 2

SPDW-60360 Waler 6127/2024 Gr. Bela 0.75 0.10 +/- 0.53 4

SPDW-60424 Wale-r 6/24/2024 Ra-226 0.04

-0.14 +/- 0.09 2

SPDW-60392 Waler 7/1012024 H-3 183

-28 +/- S3 200 SPDW-60411 Waler 7/22/2024 Gr. Alpha O.<l2

-0.06 +/- 0.29 2

SPDW-60411 Waler 7122/2024 Gr. Bela 0.71 0.40 +/- 0.51 4

SPDW-60418 Waier 7124/2024 Ra-228 0.65 0.93 +/- 0.40 2

SPDW-60451 Waler 7/3112024 Ra-226 0.07 0.02 +/- 0.06 2

SPW-1901 Waler

!116/2024 Ni-63 89

-144 +/- 51 200 SPDW-60462 Waler 8/1612024 Ra-228 0.58 0.08 +/- 0.28 2

SPDW-60529 Waler 8/1212024 Ra-226 0.04

-0.07 +/- 0.03 2

SPDW-60522 Waler 9/512024 1-131 0.11

-0.09 +/- 0.07 SPDW-60526 Waler 9/1 0/2024 H-3 183 9 +/- 88 200 SPDW-60592 Waler 9/11/2024 Ra-226 0.06

-0.11 +/- 0.05 2

SPDW-60545 Waler 9/1 3/2024 Sr-89 0.56

-0.06 +/- 0.4.3 5

SPDW-60545 Waler 9/13.r2024 Sr-90 0.52 0.06 +/- 0.25 SPDW-60560 Waler 9/26,12024 H-3 180 88 +/- 89 200 SPDW-60594 Waler 10/16/2024 Ra-228 0.73 0.43 +/- 0.39 2

SPDW-60614 Waler 11/8,1'2024 H-3 185

-29 +/- 84 200

• LiquJC! sample resu ts are reported on pC1/Llter, air tilters ( pCtlm'), cnarcoal {jl(Alma.rcoal can,sterJ and solid samples (pCto'g).

' Laboratory cocle-!l : w & SPW !Water) Ml (mil~). Al" (atr tmer), SO (s

), VE (vegetation), CH (dlarroal canister), F (fish), U Iunne).

c 1-131 (G). oodlne-t 31 as analyze<! by gamma s;,eclroscopy

• Activity recport~ 1s a net sett~ y result.

A-10

Annual Radiological Environmental Operating Report YEAR: 2024 Page 36 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-5. lnlralaboratory "Duplicate* Samples Oonoemration" Averaged Lab Code" Date Analysis First Resull Seoond Result Re-sull Acceptance SG-2660.2661 91'4.1'2023 Gr. Alpha 68.5 +/- 7.1 51.0 +/-6.3 59.8 :l: 4.7 Pass SG-2660.2661

!}14.12023 Pb-214 13.7 +/- 0.5 14.2 +/-0.5 14.0 :l: 0.4 Pass SG-2660.2661

!}14!2023 Av-228 14.4 +/- 0.8 14.3 +/- 0.9 14.4 +/- 0.6 Pass AP--090523AIB 91'5/'2023 Gr. Bela 0.023 +/- 0.003 0.023 +/-0.003 0.023 :l: 0.002 Pass AP--091223AIB

!}1 1212023 Gr. Bela 0.024 +/- 0.002 0.025 +/- 0.002 0.025 +/- 0.001 Pass W-2776,2777

!}1 1812023 G.r. Alpha 1.86 +/- 1.73 0.99 +/- 1.64 1.43 +/- 1.19 Pass W-2776,2777 W181202.3 Ra-226 0.43 +/- 0.10 0.55 +/-0.2'7 0.49 +/- 0.14 Pass W-2776,2777

!}1 1812023 Ra-228 1.71 +/- 1.07 3.33 +/- 1.12 2.52 +/- 0.77 Pass AP--092023AJB 91'2012023 Gr. Beta 0.()39 +/- 0,00,1 0.042 +/- 0.004 0.04 l +/- 0.000 Pass DW-50296,50297 91'2712023 Ra-226 0.51 +/- 0.09 0.54 +/-0.20 0.53 :l: 0. 11 Pass AP--092823AIB

!}128/2023 G.r. Bela 0.030 +/- O.Oa.t

0. 034 +/- 0.004 0.032 :l: 0.003 Pass S-3136,3137 1011 1/2023 Pb-21 4 1.93 +/- 0.06 l.84 +/-0.08 1.89 +/- 0.05 Pass S-3135,3136 1011 112023 Ac-228 4.06 +/- 0.17 3.84 +/-0.19 3.95 +/- 0.13 P*ass SG-351 1,3512 10110/2023 Gr. Alpha 59.0 +/- 6.2 68.5 +/-6.6 63.8 +/- 4.5 Pass SG-351 1.3512 10/10!2023 Gr. Beta 52.1 +/-2.9 54.6 +/-3.0 53.4 +/- 2.1 Pass SG-351 1,3512 10/10!2023 Pb-214 9.67 +/- 0.25 9.57 +/-0.29 9.62 +/- 0.19 Pass SG-351 1.3512 10/10/2023 Ac-228 8.99 +/- 0.43 8.79 +/-0.53 8.89 +/- 0.34 Pas.s SG-3521.3522 11/8/2023 Gr. Alpha 57.3 +/- 7.3 70.9 +/-7.6

64. t +/- 5.3 Pass SG-3521.3522 11/8,12023 Pb-214 11.2 +/- 0.2 11.7 +/-0.2 11.5 +/- 0.1 Pass SG-3521.3522 11/812023 Ac;-228 13.0 +/- 0.-4 13.4 +/-0.5 13.2 +/- 0.3 Pass DW-50335,50336 11l17/2023 Gr. Alpha 3.70 +/- 1.00 3.46 +/-0.00 3.58 +/- 0.67 Pass DW-50335,50336 11/17/2023 Gr. Bela 1.73 +/- 0.63 2.07 +/-0.00 1.90 :l: 0.32 Pass W-3647,3648 11/2012023 H-3 2.,815 +/- 181 2,629 +/- 182 2,822 +/- 128 Pass DW-50058,50359 121412023 Gr. Beta 2.53 +/- 0.61 1.66 +/-0.. 62 2.10 +/- 0.43 Pass DW-50349,50350 12/412023 Ra-226 0.04 +/- 0. 11 0.32 +/-0.10 0.18 +/- 0.07 Pass DW-50349,50l50 1214/2023 Ra-228 1.37 +/- DAB 1.57 +/-0.47 1.47 :I 0.34 Pass DW-50365,50366 1211112023 G.r. Alpha 1.4 +/- 0.7G 1.95 +/- 0.91 1.675 +/-0.60 Pass DW-50365,50366 12/11/2023 G.r. Bela 3.18 +/- 0.62 3.18 +/-0.66 3.18 +/- 0.45 Pass DW-50374,50375 1211312023 Gr. Alpha 0.89 +/- 0.60 0.54 +/-0.67 0.72 +/- 0.45 Pass W-4035.4036 12/3112023 H-3 157,638 +/- 1,218 159.!14B +/- 1,227 158,743 +/- 864 Pass W-4035.4036 12/3 112023 Ni-63 2,410 +/- 78 2,337 +/-78 2,373 :l: 5-5 Pass W-4035.4036 12/3112023 Sr-00 49.8 +/- 5.2 42.7 +/- 4.8 46.3 +/- 3.5 Pass OW-60000 1/5,1'2024 Gr. Alpha 2.03 +/- 0.83 1.59' +/- 0.63 1.81 +/- 0.59 Pass DW-60000 11512024 Gr. Beta 1.36 +/- 0.58 1.22 +/- 0.62 1.29 +/- 0.42 Pass W-4 1 115/'2024 Ra-226 1.67 +/- 0.35 1.03 +/-0.35 1.35 +/- 0.25 Pass W-41 11512024 Ra-226 4.19 +/- 0.85 3.45 +/-0.B3 3.82 :t 0.59 Pass W-62 1/8!2024 Ra-226 0.54 +/- 0.30 0.12 +/-0.41 0.33 :!: 0.25 Pass DW-60018 111612024 Gr. Alpha 1.75 +/- 0.74 0.98 +/-0.BO 1.37 +/- 0.54 Pass W-125.126 111612024 Ra-226 0.37 +/- 0. 1B 0.66 +/-0.27 0.52 :!: 0.16 Pass DW-60034,60035 112912024 Gr. Alpha 2.10 +/- 0.74 1.41 +/-0.. 79 1.76 :I 0.54 Pass DW-60034,60035 1129,12024 Gr. Bela 1.13 +/- 0.57 0.57 +/-0.57 0.85 +/- 0.40 Pass A-11

Annual Radiological Environmental Operating Report YEAR: 2024 Page 37 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-5. lnlralaboralory "Duplicate* Sam.pies Conoenlra!ion*

Averaged labCod1l Date Anal~is Firat Result Second Resull Re-sull Acceela.nc;e OW-60049.60050 2/5/2024 Gr. Alpha 0.61 +/- 1.02 1.20 +/-0.87 0.90 +/- 0.67 Pass OW-60049,60050 2/5/2024 Gr. Beta 0.99 +/- 0.64 1.19 +/- 0.07 1.09 +/- 0.32 Pass 0'1'1/-60054,6-0055 218/2024 Gr. Beta 0.25 +/- 0.53 0.62+/-0.61 0.44 +/- 0.40 Pass OW-60071.60072 2/1 6/2024 Ra-226 2.33 +/- 0.21 1.73 +/-0.17 2.03 +/- 0.14 Pass OW-60071,60072 2/1 612024 Ra-228 0.48 +/- 1142 0.60 +/-0.45 0.54 +/- 0.31 Pass OW-60107,60108 31212024 Gr. Alpha 1.26 +/- 0.98 1.59 +/-0.99 1.42 +/- 0.70 Pass OW-60107,60108 3/212024 Gr. Beta 0.63 +/- 0.57

0. 14 +/- 0.59 0.38 +/- 0.41 Pass SWU-666.667 3/512024 Gr. Beta 2.40 +/- 0.74 1.00 +/- 0-57 1.70 +/- 0.47 Pass OW-60120.60121 318/2024 Gr. Beta 1.15 +/- 0.56 1.04 +/-0.58 1.10 +/- 0.40 Pass LW-582,583 3/19/2024 Be-7 3.80 +/- 0.70 1.76 +/-0.60 2.78 +/- 0.46 Pass SWT-708,709 3/2612024 H-3 186 +/- 00 136 +/-87 16 1 +/- 62 Pass SW-624,625 412/2024 H-3

1. 174+/-133 1.302 +/- 138 1.238 +/- 96 Pass AP-865,866 4/3/2024 Be-7 0.04 +/- 0.01 0.05 +/- 0.01 0.05 +/- 0.01 Pass OW-60180.60181 415/2024 Ra-226 0.97 +/- 0.25 1.30 +/- 0.21 1.135 +/- 0.16 Pass OW-60180,60181 4/5/2024 Ra-228 0.85 +/- 0.48 1.34 +/-0.54 1.095 +/- 0.36 Pass WW-949.950 4/1 612024 H-3 229 +/- 94 136 +/-90 183 +/- 65 Pass S-886,887 4/1 812024 Pb-214 0.93 +/- 0.04 0.94 +/-OJJ4 0.93 +/- 0.03 Pass S-886.887 4/1 812024 Ac-228 0.82 +/- 0.08 0.83 +/-0.06 0.82 +/- 0.05 Pass OW-60206,60207 4/1 9/2024 Ra-226 2.35 +/- 0.27 3.49 +/- 0.25 2.92 +/- 0.18 Pass OW-60203,60204 4/1 912024 Gr. Alpha 2.12 +/- 0.64 1.74 +/- 0.73 1.93 +/- 0.49 Pass ow -60206,60207 4/19/2024 Ra-228 0.50 +/- 0.59

-0.21 +/- 0.63 0.15+/-0.40 Pass WW-1075,1076 4/30/2024 H-3 278 +/- 107 311 +/- 109 294 +/- 76 Pass SG-10 17.10 18 511/2024 Gr. Alpha 27.2 +/- 4.00 32.0 +/- 4.00 29.6 +/- 2.83 Pass SG-10 17.1018 511/2024 Gr. Beta 25.7 +/- 1.80 24.5 +/- 1.00 25.1 +/- 1.31 Pass SG-1017.1018 511/2024 Pb-214 3.28 +/- 0. 14 4.61 +/-0.11 3.95 +/- 0.09 Pass SG-10 17, 1018 5/1/2024 Ac-228 4.86 +/- 0. 18 4.98 +/- 0.37 4.92 +/- 0.21 Pass OW-60273,6027 4 5/2112024 Ra-228 2.12 +/- 0.63 1.33 +/- 0.45 1.73 +/- 0.39 Pass OW-60273,60724 512112024 Ra-228 0.36 +/- 0.17 0.34 +/- 0.30 0.35 +/- 0.17 Pass XW-1138,1139 5/3112024 H-3 732 +/- 124 688 +/- 122 710 +/- 87 Pass AP-060324A,B 613/2024 Gr. Beta 0.02 1 +/- 0.005 0.018 +/- 0.005 0.020 +/- 0.003 Pass AP-061224A,B 6/12/2024 Gr. Beta 0.009 +/- 0.003 0.011 +/- 0.003 0.010 +/- 0.002 Pass AP-061724A,B 6/1712024 Gr. Beta 0.03 1 +/- 0.005 0.023 +/- 0.005 0.027 +/- 0.004 Pass AP-062524A,B 6/25/2024 Gr. Beta 0.033 +/-.003 0.034 +/- 0.003 0.034 +/- 0.002 Pass SG-1432.1433 612412024 Ra-226 2.36 +/- 0.09 2.36 +/-0.08 2.36 +/- 0.06 Pass SG-1432,1433 6/'2412024 Ra-228 1.67 +/- 0. 14 1.69 +/- 0.15 1.68 +/- 0.10 Pass SG-1472.1473 711/2024 Gr. Alpha 36.0 +/- 4.5 36.8 +/- 4.5 36.4 +/- 3.2 Pass SG-1472.1473 7/1/2024 Gr. Beta 30.4 +/- 2.1 31.2 +/-2.2 30.8 +/- 1.5 Pass SG-1472.1473 7/'1/2024 Pb-214 2.64 +/- 0. 11

3. 11 +/- 0.09 2.875 +/- 0.07 Pass SG-1472.1473 7/1/2024 Ac-228 5.55 +/- 0.21 5.79 +/- 0.25 5.67 +/- 0.16 Pass A-12

Annual Radiological Environmental Operating Report YEAR: 2024 Page 38 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-5. lnlralaboralory "Duplicate* samples Concentration*

Avera.ged Lab Code" Dale Ana'lys.is First Resu'll Sooond Result Re,sull Acceptance SG-1474.1475 7/1t202<1 Gr. Alpha 43.6 +/- 5.7 37.5 +/-5.4 40.6 +/- 3.9 Pass SG-1474,1475 7!1/'2024 Gr. Beta 40.6 +/- 2.8 34.2 +/-2.7 37.4 +/- 1.9 Pass SG-1474.1475 7111'2024 P:b-214 3.58 +/- 0. 10 3.93 +/-0.10 3.76 +/- 0.07 Pass SG-1474,1475 7/11'2024 Ac.-228

'1.2 1 +/- 0.15 4.13 +/-0.16 4.17 +/- 0.11 Pass AP--070324A,B 7/'3/'2024 Gr. Bala 0.013 +/- 0.003 0.014 +/- 0.003 0.013 +/- 0.002 Pass W-1592,1593 7/9/2024 Gr. Alpha 1.23 +/- 0.67 0.36 +/-0.54 0.80 +/- 0.43 Pass W-1592,1693 7/912024 G:r. Beta 1.45 +/- 0.60 0.60 +/-0.53 1.03 +/- 0.40 Pa,s.s AP--071024A,B 7/1012024 Gr. Beta 0.024 +/- 0.000 0.025 +/- 0.003 0.024 +/- 0.002 Pass S-1613, 1614 711112024 P:b-214 197 +/- 1 200 +/- 1 199 +/- 1 Pass S-1613, 1614 7/1112024 Ao-228 134 +/- 1 143 +/- 1 139 +/- 1 Pass AP--071724A,B 7/1712024 G:r. Beta 0.038 +/- 0.001 0.032 +/- 0.003 0.035 +/- 0.001 Pass SG-1722.1723 7/2212024 Gr. Bela 16.'1 +/- 3.4 17.5+/-3.4 16.9 +/- 2.4 Pa.ss SG-1722. 1723 7/2212024 Gr. Alpha 25.5 +/- 6.9 17.5 +/-6.0 21.5 +/- 4.6 Pass SG-1722.1723 712212024 K40 6.99 +/- 1.04 5.75 +/- 0.B6 6.37 +/- 0.67 Pass SG-1722.1723 7/2212024 Pb-214 7.62 +/- 0.18 8,.10+/-0.25 7.86 +/- 0.15 Pass SG-1722.1723 7/2212024 Ac-228 4.72 +/- 0.34 4.76 +/-0.. 36 4.74 +/- 0.24 Pass OW-60413,60414 7/2212024 Gr. Alpha 1.71 +/- 0.79 0.93 +/-0.81 1.32 +/- 0.56 Pass OW-60413,60414 7/2212024 Gr. Beta 1.18 +/- 0.58 1.26.+/-0.59 1.22 +/- 0.41 Pass AP--080524A,B 8[5!2024 Gr. Beta 0.. 025 +/- 0.003 0.025 +/- 0.003 0.025 +/- 0.002 Pass AP--081324A,B B/1312024 Gr. Beta 0.030 +/- 0.004 0.028 +/- 0.004 0.029 +/- 0.003 Pass AP--082124A.B B/'2112024 Gr. Bela 0.034 +/- 0.003 0.000 +/- 0.003 0.032 +/- 0.002 Pass AP--082824A,B 8/2.812024 Gr. Beta 0.. 033 +/- 0.000 0.034 +/- 0.. 003 0.033 +/- 0.002 Pass AP--090924A,B 9!9!2024 Gr. Beta 0.025 +/- 0.005 0.026 +/- 0.005 0.026 +/- 0.003 Pass AP--091624A,B 9/16.'2024 Gr. Beta 0.044 +/- 0.004 0.043 +/- 0.004 0.044 +/- 0.002 Pass AP--092524A,B 91'2512024 Gr. Bela 0.036 +/- 0.003 0.033 +/- 0.003 0.035 +/- 0.002 Pacss SG-2362.2363 10,'4,'2024 Gr. Alpha 31.5 +/- 3.7 23.0 +/-3.3 27.3 +/- 2.5 Pa.ss SG-2362.2363 10/4,12024 Gr. Bala 24.7 +/- 1.7 19.6 +/- 1.6 22.2 +/- 1.2 Pass SG-2362.2363 10/412024 Ra-226

• 1.08 +/- 0.23 4.03 +/- 0.18 4.06 +/- 0. 15 Pass SG-2362.2363 10/412024 Ra-228 5.90 +/- 0.41 5.85 +/- 0.34 5.88 +/- 0.27 Pass S-2752.2753 10/2'112024 Pib-2 14 1.33 +/- 0.03 1.19 +/-0.03 1.26 +/- 0.02 Pass S-2752.2753 10/24/2024 Ac.-228 1.10 +/- 0.07 1.10 +/-0.04 1.10 +/- 0.04 Pass Nole; Duplicate analyses are performed on every t,,..'8n1ielh sample received. Results are not I isled for thO<Se analyses with aciivities that mea&ure below the LLD.

• Resu Its are reported in units or pCi!L. exoept lor air lil1ars (pCilFiller or pCilm3 ). food produels. vegetalion.

soil and sedimenl (pCi/g).

AP (Air Particulale}. AV (Aquatic Vegetation). BS (Bollom Sediment). Cf (CalUe Feed), CH (Charcoal Canister),

OW (Drinking Waler). E (Egg). F {Fish). G (Gracss). LW (Lake Water), MJ (Milk). P (Precipitation). Pt.I (Po'Ndered Milk}..

S {Solid}. SG (Sludge}, SO (Soil). SS (Shoreline Sediment). SW (Surface Water), SWT (Surface Waler Treated).

SWU (Surface Waler Untreated). U (Urine}. VE (Vagelation). W (Waler), WW (We'll Waler).

A-H

Annual Radiological Environmental Operating Report YEAR: 2024 Page 39 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-6. Depanment of Energy's Mixed Analyte Performance Evaluation Program (MAPEP).

Concentration" Reference Known Acceptance Lab Code b Date Analysis Laboratory re-suit Activi tv Range

• Acceptance MAAP-2761 8/1/2023 GrossAtph.a 0.16.t.0.04 0.255 0.077 - 0.-434 Pass MAAP-2761 8/112023 Gross Beta 1.16.!:0.07 0.927 0.464 - 1.391 Pass MADW-2753 8/112023 Gross Alpha 1.20.!: 0.06 1.59 0.48 - 2.70 Pass MADW-2753 8/112023 Gross Beta 14.7.t. 0.1 16.27 8.14 -24.41 Pass MAS0-2757 811/2023 Cs-134 612.!: 8 693 485 - 901 Pass MAS0-2757 81112023 Cs-137 1900.t. 20 1810 1267 -2353 Pass MAS0-2757 811/2023 Co-57 1020.!:20 1060 742 -1378 Pass MAS0-2757 8/112023 Co-6-0 901.t. 10 898 629 -1167 Pass MAS0-2757 81112023 Mn-54 6.53.t. 3.22 0

NA '

Pass MAS0-2757 8/112023 Zn-05 1270.t. 30 1160 812 -1508 Pass MAS0-2757 81112023 K-40 702.t. 54 574 402 - 746 Pass MADW-2751 8/1/2023 Cs-134 8.88.t.0.18 11.3 7.9 -14.7 Pass MADW-2751 811/2023 Cs-137 7.95.t.0.30 8.7 6.1 -11.3 Pass MADW-2751 8/112023 Co-57 16.5.t. 0.3 19.3 13.5 - 25.1 Pass MADW-2751 8/112023 Co-6-0 0.09.t.0.06 0

NA '

Pass MADW-2751 8/112023 Mn-54 11.6.t. 0.3 12.7 8.9 - 16.5 Pass MADW-2751 81112023 Zn-05 17.9.t. 0.6 19.1 13.4 - 24.8 Pass MADW-2751 81112023 K-40 1.56.t. 1.60 0

NA C Pass MAAP-2755 8/1/2023 Cs-134 1.30.t.0.10 1.60 1.12 -2.08 Pass MAAP-2755 8/1/2023 Cs-137 0.04.t.0.03 0

NA '

Pass MAAP-2755 8/112023 Co-57 1.47.t. 0.05 1.63 1.14 -2.12 Pass MAAP-2755 81112023 Co-6-0 0.04.t.0.09 0

NA C Pass MAAP-2755 811/2023 Mn-54 1.59.t.0.09 1.57 1.10 - 2.04 Pass MAAP02755 811/2023 Zn-05 1.71.t. 0.14 1.89 1.32 - 2.46 Pass MAAP-2755 8J1/2023 Sr-90 0.533.t. 0.040 0.614 0.430 - 0.796 Pass MAVE-2759 8/1/2023 Cs-134 4.25.!: 0.14 4.96 3.49 -6.47 Pass MAVE-2759 81112023 Cs-137 0.025.t. 0.050 0

NA '

Pass MAVE-2759 81112023 Co-57 4.28.!: 0.13 4.24 2.97 - 5.51 Pas-s MAVE-2759 8/112023 Co-6-0 2.49.t.0.11 2.79 1.95 - 3.63 Pass MAVE-2759 81112023 Mn-54 2.45.t. 0.16 2.6 1.8 - 3.3 Pass MAVE-2759 8/112023 Zn-05 0.058 - 0.107 0

NA '

Pass A-14

Annual Radiological Environmental Operating Report YEAR: 2024 Page 40 of 82 L-25-065 Company: Vistra J Plant: Perry Nuclear Power Plant TABLE A-6. Department of E.norgy's Mixed Analyte Performanoo Evaluation Program (MAPEP).

Cone&ntratlon

• Refornnco Kno-11m Aceoptanoo Lab Code 1>

Dam Analysis Laboratory re.suit Activity Range' Accepianco MADW-429 2/112024 Gross Alpha 0.641 :t 0.048 1.01 0.30 - 1.72 Pass MADW-429 21112024 Gross Sota 4.71 :t0.08 5.6 2.79 - 8.36, Pass MAD*W-457 2/112024 Cs.-1:34 0.09 :t0.19 0

NA t Pass MADW-457 2/112024 Cs-137 11.1 :t0.4 9.7 6.8-12.6 Pass MADW-457 211,/2024 C0-.57 26.4 :t 0.4 25.4 17.8 - 33.0 Pass MADW-457 211/2024 Co-60 112 :tO.l 10.27 7.19 - 13..3-5 Pa.ss MADW-457 2/1/2024 Mn-54 8.23 :t0.39 7.36 5.15 - 9.57 Pass MAOW-457 211/2024 Zn-65 0.10 :t0.30 0

NA '

Pass MAOW-457 2/1/2024 K-40 3.16 +/-2.49 0

NA <

Pa.ss MAOW-457 211/2024 Ra-226 0.46 :t0.07 0.310 0.217 - 0.403 Falld MAAP-459 2/112024 Cs-134 0.03 :t0.00 0

NA '

Pa.ss MAAP-459 21112024 Cs-137 1.30 :!:0.07 U8 1.04 - 1.92 Pass MAAP-459 2/112024 Co-57 0.58 :!:0.03 0..819 0.573 - 1.065 Pa.ss MAAP-459 21112024 Co-60 1.30 :t0.06 1.64 1.15-2.13 Pa.ss MAAP-459 211/2024 Mn-54 0.51 :t 0.0-5 0.555 0.389 - 0. 722 Pass MAAP-459 211/2024 Zn-65 0.27 :t0.07 0.332 NA "

Pa.ss MAS0-461 211/2024 Cs-134 345 +/-2 404 283 - 525 Pass MAS0-461 211/2024 Cs.-137 1539 :t 7 1550 1085-2015 Pass MAS0-461 21tl2024 Co-57 355 +/-4 401 281 - 521 Pass MAS0-461 211/2024 Co-60 619 :1:4 660 462 - 858 Pa.ss MAS0-461 211/2024 Mn-54 332 :1: 13 332 232 - 432 Pa.ss MAS0-461 211/2024 Zn-65 543 :1:9 703 492 - 914 Pa-ss MAS0-461 211/2024 K-40 510 :1:20 485 340 - 631 Pa.ss MAVE-464 211/2024 Cs.-134 2.97 :t0.08 3.67 2.57 -4.77 Pa,ss MAVE-464 211/2024 Cs.-137 2.36 :t0.15 2.57 1.80 - 3.34 Pass MAVE-464 211/2024 Co-57 1.78 :t0.09 2.53 1.77 - 3.29 Pass MAVE-464 211/2024 Co-60 2.61 :t 0.13 2.96 2.07 - 3.85 Pass MAVE-464 211/2024 Mn-54 0.03 :t0.o7 0

NA <

Pa-ss MAVE-464 211/2024 Zn-65 6.41 :t0.30 8.02 5.61 - 10.43 Pass

• Results are reported m units of Bq/kg (soil ), Bq/L (watet) or Bq,'l.otal sample (filters, vegetation).

• Laboratory codes as fojlows. MAW ('NBterl, t.lADW (water), MAAP {air filter), MASO (soil) and MAVE (vegetation).

' MAPEP resuhs are presented as 1he kntYMl values and Bll!J)8cied laboratory precision (1 sigma, 1 de1ermination) and oontrol limits as defined by 1he MAPEP. A known value ol *zero' indica1es an anal)*sis was inctuded in the te-sting series as a 'false positive'. MAPEP dCEs not pro*Jide an acceptance range.

• A radrum-226 study is unde:rway to de1emnne 1he reason for the radium-226 failure.

• Provided in the series for *sensitivity evaluation'. MAPEP does no1 pro-Jide control limits.

A-15

Annual Radiological Environmental Operating Report YEAR: 2024 Page 41 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant TABLE A-7. lnlertaboralory Comparison Crosscheck Program, Environmental Re'SOurce As'SOciates (ERA)*.

MRAD-40 Study Concentration

• lab Code*

Date Anal)l$is laboratory ERA Acceptance Result Value <

limits d Aoceetance ERAP-674 3118/2024 Cs-134 291 +/- 4 273 1n - 335 Pass ERAP-674 3118/2024 Cs-137 131 +/- 6 106 87 - 139 Pass ERAP-674 3.118/2024 Co-60 1240 :: 8 1120 952 - 1420 Pass ERAP-674 3118/2024 Mn-54

< 3.1

< 35.0 0.00 - 35.0 Pass ERAP-674 3118/2024 Zn-85 102 +/- 9 77.2 63.3 - 118 Pass ERAP-674 3118/2024 Sr-90 173 i 5 158 99.9 - 215 Pass ERAP-600 3118/2024 Gross Alpha 110 +/- 3 96.9 50.1 - 158 Pass ERAP-800 3118/2024 Gross Bela 3 1.7 +/- 1.6 22.2 13.5 -33.5 Pass

• Resulls oblained by Microbac laboralo.rie-s - Northbrook as a participant in the crosscheck program for proficiency testing administered by Environmenlal Resource Associates. serving as a replacement for studies oonducied previously by the Environmenlal Measwemenls laboratory Quality Assessment Program {EML).

• l aboratory code ERAP (air filler). Results are reported in units of (pCi.lFiller).

• The ERA Assigned values fo.r the air filler standards are equal lo 100% of lhe parameler present in the standard as dale rmined by the gravimetric andlor volume Irie measuremenls made during standard preparation as applicable.

d The acceptance limits are eslablished per the guidelines contained in lhe Department o4 Energy (DOE) report EML-564. Anal~is of Envircnmenlal Measurements Labora!ory (EML) Quality Assessment Program (OAP)

Data Determination ol Operaliona1 Crileria and Control Limi1s lor Performance Evaluation Purp05es or ERA's SOP for the generation of Performance Acceptance Limits.

A-16

Annual Radiological Environmental Operating Report YEAR: 2024 Page 42 of 82 L-25-065 Company: Vistra

] Plant: Perry Nuclear Power Plant

@MICROBAC AppendixB Data Reporting Conventions

Annual Radiological Environmental Operating Report YEAR: 2024 Page 43 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant APPENDIX B.

DATA REPORTING CONVENTIONS Data Reporlino Conventions 1.0. All activities. except gross alpha and gross beta. are decay corrected to cotlection lime or the end of the collection period.

2.0. Single Measuremenls Each single measurement is reported as follows:

x.!: s where:

x = vatue of the measurement; s = 2cr counting uncertainty (corresponding to lhe 95% confidence level).

In cases where the activity is less than the lower limit of detection L, it is reported as. < L, where L = the lower limit of detection based on 4.66a uncertainty for a background sample.

3.0. Duplicate analyses If duplicate analyses are reported, lhe convention is as follows. :

3.1 Individual results. For two analysis results; x1 :1: s1 and x2 :1: s, Reported result:

x :ts: where x = (1/2) (x, + x.2) and s = (112) ~

3.2.

3.3.

Individual results.

< L1 _ < L2 Individual results.

x.!: s. < L Reported result: < L, where L = lower of L1 and L2 Reported result:

x.!: s if x ~ L: < L otherwise.

4.0. Computation of Averages and Standard Deviations 4.1 Averages and standard deviations listed in the tables are computed from all of the individual measurements over the period averaged; for examp~e. an annual standard deviation would not be the average or quarterty standard deviations. The average x and standard deviation *s" of a set of n numbers x,, ~... x0 are defined as follows:

_ r (x- : 't; s -

n-1 4.2 Values below the highest lower limit of detection are not in-eluded in the average.

4.3 If all values in lhe averaging group are less than the highest LLD, the highest LLD is reported.

4.4 If all but one of the values are less than lhe highest LLD, the single value x and associated two sigma error is reported.

4.5 In rounding off. the following rules are followed:

4.5.1. If the number fo llowing lhose to be retained is less than 5. the number is dropped, and the retained numbers are kept unchanged. As an example. 11.443 is rounded off to 11.44.

4.5.2. If lhe number following those to be retained is equal to or greater than 5. the number is dropped and the last retained number is raised by 1. As an example. 11.445 is rounded off to 11.45.

B-1

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 44 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only. : REMP Data Summary Reports Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Air pCi/m3 Be-7 28 N/A 0.054 28/28 0.030 - 0.077 0.056 24/24 0.033 - 0.077 35 0.6 E

0.061 4/4 0.055 - 0.071 0.055 4/4 0.030 - 0.068 0

Air pCi/m3 Co-58 28 N/A

< LLD 0/28

< LLD 0/24

< LLD 0/4 0

Air pCi/m3 Co-60 28 N/A

< LLD 0/28

< LLD 0/24

< LLD 0/4 0

Air pCi/m3 Cs-134 28 0.005

< LLD 0/28

< LLD 0/24

< LLD 0/4 0

Air pCi/m3 Cs-137 28 0.045

< LLD 0/28

< LLD 0/24

< LLD 0/4 0

Air pCi/m3 Gross Beta 364 0.0075 0.024 364/364 0.007 - 0.054 0.024 312/312 0.007 - 0.054 1

3.4 ENE 0.027 52/52 0.009 - 0.054 0.024 52/52 0.009 - 0.043 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 45 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Air pCi/m3 I-131 364 0.050

< LLD 0/364

< LLD 0/312

<LLD 0/52 0

Broadleaf Vegetation pCi/kg wet Be-7 70 N/A 398.4 34/70 115 - 1598 424.4 32/54 115 - 1598 7

0.6 NE 782.8 4/6 278 - 1598 315.1 10/16 201 - 518 0

Broadleaf Vegetation pCi/kg wet K-40 70 N/A 5022.2 70/70 2691 - 11102 4949.8 54/54 2691 - 11102 7

0.6 NE 6381.2 6/6 3393 - 11102 5266.4 16/16 4128 - 7135 0

Broadleaf Vegetation pCi/kg wet Co-58 70 N/A

< LLD 0/70

<LLD 0/54

< LLD 0/16 0

Broadleaf Vegetation pCi/kg wet Co-60 70 N/A

< LLD 0/70

<LLD 0/54

< LLD 0/16 0

Broadleaf Vegetation pCi/kg wet I-131 70 45

< LLD 0/70

<LLD 0/54

< LLD 0/16 0

Broadleaf Vegetation pCi/kg wet Cs-134 70 45

< LLD 0/70

<LLD 0/54

< LLD 0/16 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 46 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Broadleaf Vegetation pCi/kg wet Cs-137 70 60

< LLD 0/70

<LLD 0/54

< LLD 0/16 0

Fish pCi/kg wet K-40 8

N/A 1690.3 8/8 1105 - 2611 1821.0 5/5 1105 - 2611 25 0.6 NNW 1821.0 5/5 1105 - 2611 1472.3 3/3 1246 - 1675 0

Fish pCi/kg wet Mn-54 8

94

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Fish pCi/kg wet Fe-59 8

195

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Fish pCi/kg wet Co-58 8

97

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Fish pCi/kg wet Co-60 8

97

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Fish pCi/kg wet Zn-65 8

195

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 47 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Fish pCi/kg wet Cs-134 8

97

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Fish pCi/kg wet Cs-137 8

112

< LLD 0/8

< LLD 0/5

< LLD 0/3 0

Sediment pCi/kg wet K-40 4

N/A 6883.3 4/4 6045 - 8284 6888.3 4/4 6045 - 8284 64 0.4 WNW 7164.5 2/2 6045 - 8284 N/A N/A N/A 0

Sediment pCi/kg wet Co-58 4

50

< LLD 0/4

< LLD 0/4 N/A N/A N/A 0

Sediment pCi/kg wet Co-60 4

40

< LLD 0/4

< LLD 0/4 N/A N/A N/A 0

Sediment pCi/kg wet Cs-134 4

112

< LLD 0/4

< LLD 0/4 N/A N/A N/A 0

Sediment pCi/kg wet Cs-137 4

135

< LLD 0/4

< LLD 0/4 N/A N/A N/A 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 48 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range TLD (E) mR/91 days Direct 116 1.0 14.9 116/116 8.2 - 21.6 14.9 108/108 8.2 - 21.6 29 4.3 SSE 18.6 4/4 15.3 - 21.6 14.1 8/8 12.2 - 16.4 0

TLD (Q) mR/91 days Direct 116 1.0 14.4 116/116 10.1 - 21.8 14.4 108/108 10.1 - 21.8 33 4.5 S

18.4 4/4 15.6 - 21.8 14.2 8/8 11.6 - 15.9 0

TLD mR/365 days Direct 29 1.0 61.1 29/29 48.4 - 89.1 61.5 27/27 48.4 - 89.1 33 4.5 S

89.1 1/1 89.1 - 89.1 56.4 2/2 50.3 - 62.4 0

Water pCi/L Gross Beta 60 3

1.4 37/60 0.9 - 2.8 1.4 31/48 0.9 - 2.8 36 3.9 WSW 1.6 7/12 0.9 - 2.8 1.4 6/12 1.2 - 1.7 0

Water pCi/L H-3 20 1500

<LLD 0/20

<LLD 0/16

<LLD 0/4

<LLD 0/4 0

Water pCi/L Mn-54 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Fe-59 60 22

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 49 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Water pCi/L Co-58 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Co-60 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Zn-65 60 22

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Zr-95 60 22

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Nb-95 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Cs-134 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L Cs-137 60 13

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Page 50 of 82 Company: Vistra Plant: Perry Nuclear Power Plant 1 Mean and range are based on detectable measurements only.

Pathway Sampled (Units)

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

All Locations Mean1 Detected/Collected Range1 Indicator Mean1 Detected/Collected Range1 Location with Highest Annual Mean Control Mean1 Detected/Collected Range Number of Non-routine Reported Measurements Location #

Distance Direction Mean1 Detected/Collected Range Water pCi/L Ba-140 60 45

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Water pCi/L La-140 60 11

< LLD 0/60

< LLD 0/48

< LLD 0/12 0

Annual Radiological Environmental Operating Report YEAR: 2024 Page 51 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant : 2024 REMP Detailed Data Report

©} MICROBAC MONTHLY PROGRESS REPORT to ENERGY HARBOR RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (REMP)

FOR THE Rev~and Approved Ost~

S Chapin PERRY NUCLEAR POWER PLANT Reporting Penod* January-December, 2024 Ptepere,d and Submrtttd by Microbac Laboratortes Inc A Benevat, PhO Llll>Orato,y 0.ectof Project N<llllbe<: 8033 P Hontz, OhlO Department of Hea>lfl B Mechenboer. Lake County Hea~h Department Date 2-/U /-is-I

Annual Radiological Environmental Operating Report YEAR: 2024 Page 52 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PERRY NUCLEAR POWER PLANT.

TABLE OF CONTENTS List of Tables.................................................................................... iii

1.0 INTRODUCTION

.................................................................................. iv 2.0 LISTING OF MISSED SAMPLES.......................................................... v 3.0 DATA TABLES................................

.......................................... vi Appendices A

lriter1aboratory Comparison Program Results............................................... A,1 8

Data Reporting Conventions.................................................................... B-1 ii

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PERRY NUCLEAR POWER PLANT UST Of TABLES Direct Radiabon. Quarterly and Annual...

.......................................... 1-1 2

Airborne Particulate Filters and Charcoal Canisters...................................... 2*1 3

Auborne Particulate Filters...................................................................... 3-1 4

Lake Water......................................................................................... 4-1 5

7 9

Milk......................................

Food Products......................

Fish..............

... 5-1

. 7-1

........................... **** ** *** ****................... 9-1 Page 53 of 82 11 Sediments........................................................................................... 11 -1

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PERRY NUCLEAR POWER PLANT

1.0 INTRODUCTION

The following constitutes the current 2024 report for the Radiological Environmental Monitoring Program conducted at the Perry Nuclear Power Plant in Perry, Ohio. Results of completed analyses are presented in the attached tables.

Page 54 of 82 The data obtained in the program were within ranges previously encountered and to be ex:pected in the environmental media sampled.

All coocenlrations, exce pl gross beta, are decay corrected to the time of collection. Airborne iodine is decay corrected lo the midpoint of the collection period.

Ali samples were collected within the scheduled period; unl.ess noted otherwise in Table 2.0, Listing of Missed Samples.

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Sample Type location 2.0 LISTING OF MISS.EQ.SAMPLES Expected Collection Date V

Reason Page 55 of 82

Annual Radiological Environmental Operating Report YEAR: 2024 Page 56 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant 3.0 DATA TABLES vi

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Tat>1e 1. Direct Radiation {TLDs). Ouartefly Exposure.

Units: mR/91 days Date Placed Date Removed E-1 E-3 E-4 E-5 E-6 E-7 E-8 E-9 E-10 E-11 E-12 E-13 E-14 E-15 E-21 E-23 E-24 E-29 E-30 E-31 E-33 E-35 E-36 E-53 E-54 E-55 E-56 E-57 E-58 Mean :t s.d.

E-Conttol 1 E-Control 2 1st Otr.

12-26-23 04-12-24 15.0 :t0.8 12.4 :t0.6 13.3 :t0.8 15.5 :t 0.4 15.9 +/- 0.4 15.5 :t 0.5 13.9 :t 0.6 13.7 :t 0.5 12.8 :t 0.5 13.9 :t 0.7 16.0 :t 0.5 15.3 :t 0.7 16.9 :t 0.7 14.7 :t 0.6 16.3 :t 0.5 19.0 :t 0.6 13_5 :t0.4 20.8 :t 0.7 18.2 :t 0.6 19.2 :t 0.6 18.5 +/- 0.7 14.5 +/- 0.5 18.6 :t 0.9 14.1 +/- 0.5 15.5 :t 0.4 16.0 :t 0.9 16.0 :t 0.6 14.6 :t 0.6 15.4 t 0.8 15.7 :t 2.1 11.0 t 0.5 10.7 :t. 0.4 2nd Qtr, 04-12-24 07-03-24 11.9 t 1.0 8.2 t 0.8 12.5 :t 0.8 9.2 t 0.6 12.8 t 0.9 11.1 t 0.8 13.5 10.8 11.8 :t 0.7 11.4 t 1.1 13.5 :t0.8 10.2 :t0.8 12.8 t 1.0 13.2 :t 0.6 10.0 t 0.9 12.6 :t 0.8 13.3 :t0.7 12.2 :t 0.7 15.3 :t 1.1 14.6 :t 0.7 16.2 :t 0.7 15.2 :t 0.8 12.6 :t 0.8 16.4 +/-0.8 12.8 :t 0.7 15.0 :t 0.7 11.2 :t 0.8 12.4 :t 0.8 13.9 :t 1.0 10.9 :t 0.7 12.6 :t 2 0 8.0 :t 1.0 9.4 :t 0.7 3rd Otr, 07-03-24 10-10-24 14.9t1.0 12.5 :t 0.9 13.3 t0.7 14.7 +/-0.5 16.4 :t. 0.5 16.1 +/-0.4 15.6 :t 0.6 14.7 :t0.4 13.6 :t0.6 16.8 +/-0.8 17.5 :t 0.6 15.9 :t0.5 17.7 :t 0.6 14.9 +/- 0.5 17.4 +/-0.8 20.2 :t 0.4 13.4 :t 0.4 21.6 +/-0.7 19.3 :t 0.6 19.8 :t 0.8 20.5 :t 0.8 14.9 :t 0.5 19.5 :t 0.8 15.9 :t 0.4 16.6 +/- 0.4 17.7+/-1.1 17.1 :t 0.5 15.7 :t0.7 16.7 :t 0.9 16.6 :t 2.3 11.1 :t 0.6 10.4 :t 0.4 Page 57 of 82 PNPP 4th 01.f.

10-10-24 01 25 14.0 :t 1.0 10.1 :t0.9 14.5 :t 0.8 11.0 :t.0.8 15.0.t 1.1 14.1 t0.9 15.1 t0.8 14.2 t0.7 11.1 :t 1.2 15.4 :t.0.8 12.1+/-1.0 13.4 t0.9 14.5 :t0.8 10.3 +/-0.9 17.5 t,0.9 14.2 :t0.7 13.6 :t0.8 16.6 :t 1.0 16.0 +/-0.7 17.9 +/-0.7 17.5+/-0.7 13.8 :t 0.8 18.2 +/-0.7 15.4 :t 0.8 16.2 :t 0.8 13.5 :t 0.9 13.9 :t 0.9 15.1 :t 1.2 15.8 :t 0.7 14.5+/-2.1 8.4 :t 1.0 9.5 :t0.7

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 1. Direcl Radiation (TlDs}, Quarterly Exposure.

Units: mR/91 days Date Placed Date Removed Q.1 Q-3 Q-4 Q-5 Q-6 Q-7 Q-8 0 -9 Q-10 Q-11 Q-12 Q-13 Q-14 Q-15 Q-21 Q-23 Q-24 Q-29 Q-30 Q-31 0 -33 a.35 0 -36 0-53 0-54 0-55 0-56 Q.57 Q-58 Mean+/- s.d.

Q.Contro11 O*Contro12 1st Otr, 12-26-23 04-12-24 12.9 +/- 0.7 12.1 +/- 0.6 14.3 :!: 0.5 12.1 !0.5 14.5 !0.5 12.2 t 0.3 14.6.!0.5 10.1 !0.7 12.8 :t0.4 16.2 !0.4 14.2 t0.4 15.7 !0.5 14.4 t0.7 10.8 :!: 0.4 16.5 !0.6 16.2 :t0.7 14.7!1.2 16.3 :!:0.6 17.0.t0.4 15.0 :t0.3 20.4 t 1.0 11.2 +/-0.4 15.3 t0.6 13.0 t0.5 14.9 +/-0.3 13.6 t0.6 13.2 t0,6 13.1 +/-0.7 15.2 t 1.0 14.3 +/- 2.2 9.5 t 0.3 10.3 t O 6

~

04-12-24 07-03-24 13.4 :1: 0.7 12.9 +/- 0.8 11.9 +/- 0.6 10.8 t 0.6 11.6 t 0.6 11.4 +/- 0.6 13.8 +/- 0.6 12.3 +/- 0.9 12.4 :!:0.6 12.5 +/- 0.6 15.3 +/- 0.7 12.8 :t0:9 12.2 t0.7 12.1 +/- 0.6 18.0 +/- 1.1 15.8 !0.9 15.0 ! 0.6 18.4 t0.6 15.7 !0.6 16.5 :t0.7 15.8 t0.6 12.6 :t0.9 15.9 +/-0.6 14.5+/-1.1 13.4 i0.6 16.0 t0.6 12.3+/-0.7 15.3 :!:0.8 12.8 :t 0.6 13.9 +/- 2.0 8.4 +/- 1.1 8.8 +/-0.7 1*2

~

07-03-24 10-10-24 13.6 +/- 0.7 12.5 +/- 0.6 15.3 +/- 0.7 12.0 t 0.6 15.0 t 0.5 13.2 t 0.4 15.8 :!:0.6 11.2 :!: 0.9 13.2 !0.5 17.1 !0.6 14.8 +/- 0.6 16.4 :!:0.7 15.0 :t 0.6 11.0 :t 0.6 17.2 t0.9 19.2 :t0.8 14.9!1.1 16.9 i0.7 17.6!0.5 15.6 !0.4 21.8 +/- 1.3 11.5 +/-0.5 16.0 +/-0.7 14.8 i0.5 15.3 :1: 0.4 15.4 i 0.6 14.3 +/-0.6 13.1 +/- 0.8 16.2 +/- 1.2 15.0 +/- 2.4 9.3 +/- 0.4 9.9 +/- 0.8 Page 58 of 82 PNPP

~

10-10-24 01.()6.25 13.6 +/- 1.4 13.5 +/- 1.7 14.0 +/- 1.3 12.3+/- 1.4 11.6 t 1.3 12.7 +/- 1.3 14.2.t 1.3 10.6 :!: 1.7 12.1 :t 1.3 12.7 +/- 1.3 16.4 +/- 2.0 13.4 +/- 1.4 13.3 :t 1.4 12.4 :t 1.3 19.1 t 1.7 15.9 :t 1.4 15.9 +/- 1.4 19.6 +/- 1.5 15.6 +/- 1.4 16.9 +/- 1.5 15.6_1.4 12.8 :t 1.5 16.4 +/- 1.4 15.3+/-1.6 14.4 t 1.3 15.5+/-1.4 14.3 t 1.4 14.8 +/- 1.5 12.3:t1.3 14.4 :t 2.1 7.6 t 1.7 7.8 :t 1.3

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Tal>te 1. Direct Radiation (TLDs). Annual Exposure.

Units: mR/365 days Date Placed Date Removed A-1 A-3 A-4 A-5 A-6 A*7 A-8 A-9 A-10 A-11 A-12 A-13 A*14 A-15 A-21 A*23 A*24 A-29 A-30 A-31 A-33 A-35 A-36 A-53 A-54 A-55 A-56 A-57 A-58 Meant s.d.

A-COnlJol 1 A-Conlrol 2 1-3 2024 12-26-23 01 25 57.8 +/- 2.8 49.6 +/- 1.7 57.3 +/- 2.4 50.8+/-1.7 62.4 !. 1.9 50.4 !. 1.8 48.9 t 1.5 49.9 !. 1.7 48.4 t 1.3 57.7+/-1.2 49.6 !. 1.2 62.2!.1.9 61.6 t2.7 54.6t1.9 65.6 t 3.6 58.1 t 2.3 50.3 +/-2.8 85.1 t 2.0 67.0 t 1.9 72.3 :t 2.9 89.1 t 3.0 50.6 +/- 0.9 73.4 +/- 1.4 70.1 :t 1.3 64.8 +/- 1.5 65.1 +/- 1.2 70.7 :t 3.9 73.6 +/-2.4 58.5 +/- 1.9 61.2 +/- 10.8 31.4+/- 1.2 36.5 +/- 1.7 Page 59 of 82 PNPP

Annual Radiological Environmental Operating Report YEAR: 2024 Page 60 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Alrbome partlcutates and charcoal canisters. analyses fOl gross beta and lodine-131.

Location: p.1 UnllS: pClfrrr Collection: Continuous. weekly exchange.

Date Volume Date Voltlme Col ectoo jm~}

Gross Beta 1*131 Col ected

{m~)

Gross Sera 1-131 RegulredJ.LQ 0.0075 o.oso ilJl9.Z.§ Q.Q§Q 01-10-24 531 0.021 :1: 0.003

<: 0.010 07-10.24 657 0.028 :1: 0.003

<: 0.006 01-17*24 352 0.048 :1: 0.005

<: 0.014 07-17-24 642 0.020 :1: 0.003

<:0.006 01-24-24 502 0.029 :1: 0.003

<: 0.010 07-24-24 669 0.022 :1: 0.002

< 0.005 01-31 -24 soo 0.009 :I: 0.003

<: 0.015 07-31 -24 669 0.020 :I: 0 002

<: 0.006 02-07-24 528 0.018 :1:0.003

< 0.010 08-07-24 645 0.028 :I: 0.003

<: 0.004 02-14-24 540 0.027 :t 0.003

< 0.006 08-14-24 6.24 0.014 :I: 0.002

-: 0.012 02-211-24 541 0.033 :I: 0.003

<0,013 08-21 -24 594 0.024 :I: 0.003

<:0.009 02-28-24 529 0.030 :t 0.003

< 0.014 08-28-24 596 0.040 :I: 0.003

-: 0.007 03-06-24 523 0.021 :t 0.003

< 0.009 09-04-24 577 0.022 :t 0.003

<:0.00,8 03-13-24 474 0.019 :I: 0.003

<: 0.006 09-11 -24 569 0.025 :I: 0.003

< 0.008 OJ.20-24 310 0.038.t 0.006

< 0.012 09-18-24 5711 0.045 :I: 0.004

-: 0.006, 03-27-24 521 0.015 :t 0.003

< 0.008 09-25-24 569 0.036 :t 0.003

< 0.004 04-03-24 583 0.023 :t 0.003

< 0.011 10-02-24 572 0.017 :1: 0.003

< 0.007 102024 Mean :1: s.d.

0.025 t 0.010

<: 0.015 302024 Mean :t:s.d.

0.026 :I: 0.009

<: 0.012 04-10*24 529 0.011 t 0.003 C 0.007 10-09-24 559 0 027 :t 0.003

< 0.007 04-17-24 540 0.020 :t 0.003

< 0.006 10-16-24 526 0.016 :t 0.003

< 0.011 04-24-24 541 0.017 :1: 0.003

< 0.006 t0-23-24 472 0.054 t 0.004

<: 0.006 05.01-24 390 0.030 i 0.004

<:0,017 10-30-24 533 0.033 :t 0.003

<: 0.004 05-08-24 460 0.018 i: 0.003

< 0.008 11-06-24 548 0.026 t 0.003

<: 0.010 05-14-24 299 0.019 t 0.005

< 0.012

• 11*13-24 519 0.021 :I: 0.003

< 0.005 05-22-24 202 0.050 :t 0.008

< 0.023~

11*20-24 525 0.038 :t 0.004

<: 0.007 05-29-24 693 0.018 i0.002

< 0.009 11*27-24 530 0.024 :t 0.003

< 0.010 06-05-24 556 0.029 :t 0.003

< 0.007 12-04-24 525 0.032 :t 0.003

< 0.006 06-12-24 633 0.010 :1:0.002

< 0.008 12-11-24 513 0.040.t 0.004

< 0.008 06-19-24 614 0.024 +/- 0.003

< 0.006 12-18-24 509 0.040 t 0.004

< 0.010 06-26-24 639 0.038.t 0.003

< 0.008 12-25-24 521 0.029 :t 0.003

-: 0.012 07.03-24 630 0.012 +/- 0.002

< 0.007 01-01 -25 530 0.033 :t 0.003

< 0.015 2Q 2024 Mean :I: s.d.

0.023 i: 0.011

< 0.023 4Q 2024 Mean +/-s.d.

0.032 :I: 0.010

< 0.015 Cumulative Average 0.027

~ Pump problems at the sraoon.

2*1

Annual Radiological Environmental Operating Report YEAR: 2024 Page 61 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particl.Aates and charcoal canisters, analyses for gross beta and iodine-131.

location:

p.3 Units: pCi/m3 Collection: Continuous, weekly exchange.

Date Volume Dale Volume Colleded (m")

Gross Beta 1*131 Collecte<!

(m0 )

Gross Beta 1*131 Reguired LLC 0.0075 0.050 0.0075 0.050 01-10-24 560 0.024 +/- 0.003

< 0.009 07-10-24 594 0.030 +/- 0.003

< 0.006 01 24 536 0.039 +/- 0.003

< 0.009 07-17-24 538 0.020 +/- 0.003

< 0.007 01-24-24 524 0.026 +/-0.003

< 0.010 07-24-24 571 0.021 +/- 0.003

< 0.006 01 24 560 0.011 +/- 0.002

< 0.013 07-31-24 542 0.022 :t 0.003

< 0.008 02-07-24 657 0.020 +/-0.003

< 0.008 08-07-24 473 0.032 +/- 0.004

< 0.005 02-14-24 677 0.024 +/- 0.003

< 0.005 08-15-24 636 0.017 :t0.003

< 0.011 02-21 -24 625 0.026 +/- 0.003

< 0.01 1 08-21-24 525 0.024 +/- 0.003

< 0.010 02-28-24 663 0.028 +/- 0.003

< 0.011 08-28-24 585 0.033 :I: 0.003

< 0.007 03-07-24 752 0.017 +/- 0.002

< 0.006 09-04-24 554 0.021 :I: 0.003

< 0.008 03-13-24 557 0.022 +/- 0.003

< 0.005 09-11-24 194 0.017 :t 0.007

< 0.024

• 03-20-24 662 0.0,8 +/-0.003

< 0.005 09-18-24 519 0.044 +/-0.004

< 0.007 03-27-24 704 0.017 +/- 0.002

< 0.006 09-25-24 524 0.038 +/- 0.003

< 0.005 04-03-24 682 0.023 :1: 0.002 C 0.009 10*02-24 348 0.033 +/- 0.004

<0.011

• 102024 Mean :t s.d.

0.023 :I: 0.007

< 0.013 30 2024 Mean+/- s.d.

0.027 :1: 0.009

< 0.024 04-10-24 583 0.010 +/- 0.002

< 0.006 10*09-24 580 0.029 +/- 0.003

< 0.007 04-17-24 658 0.021 :t 0.003

< 0.005 10-16-24 630 0.014 +/- 0.002

< 0.009 04-24-24 689 0.018 +/- 0.002

< 0.005 10-23-24 636 0.041 +/- 0.003

< 0.005 05-01-24 641 0.022 :t 0.003

< 0.011 10-30-24 634 0.027 +/- 0.003

< 0.003 05-08-24 646 0.019 :t 0.002

< 0.006 11-06-24 647 0.022 +/- 0.003

< 0.009 05-14-24 575 0.015 +/- 0.003

< 0.006 11-13-24 628 0.021 +/- 0.003 C 0.004 05-22-24 728 0.022 +/- 0.002

< 0.006 11-20-24 656 0.035 +/- 0.003

< 0.006 05-29-24 632 0.019 +/- 0.003

< 0.010 11-27-24 657

0. 022 +/- 0. 003

< 0.008 06-05-24 626 0.021 +/- 0.003

< 0.006 12-04-24 672 0.032 +/- 0.003

< 0.005 06-12-24 630 0.010 +/- 0.002

< 0.008 12-11 -24 621 0.032 +/- 0.003 C 0.006 06-19-24 592 0.027 +/- 0.003

< 0.007 12-18-24 643 0.035 +/- 0.003

< 0.008 06-26-24 552 0.031 +/- 0.003

< 0.009 12-25-24 645 0.030 :I: 0.003

< 0.010 07-03-24 578 0.013 +/- 0.003

< 0.008 01-01 -25 599 0.031 +/- 0.003

< 0.013 20 2024 Mean :t s.d.

0.019 :I: 0.006

< 0.011 40 2024 Mean+/- s.d.

0.029 +/- 0.007

< 0.013 Cumula live Average 0.024

• lower vo ume due to a power fa 1lure al the stalion.

2-2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 62 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particulates and charcoal canisters. analyses for gross beta and iodine-131.

Location:

P-4 Units: pCi/m 3 Col ection: Continuous, weekly e:itcflange.

Date Volume Dale Volume Collected (m,)

Gross Seta 1-131 Collected (m")

Gross Beta 1-131 Required LLD 0.0075 0.050 0.0075 0.050 01-10-24 606 0.023 t 0.003

< 0.008 07-10-24 642 0.024 ;tt 0.003

<0.006 01 24 611 0.029 t 0.003

< 0.008 07-17-24 593 0.017 1: 0.003

<0.006 01 24 587 0.021 t 0.003

< 0.009 07-24*24 624 0.019 :t 0.003

<0.006 01 24 598 0.007 t 0.002

< 0.012 07-31 -24 626 0.020 t 0,003

<0.007 02-07-24 577 0.021 :.t 0.003

< 0.009 08-07-24 605 0.023 t 0.003

<0.004 02-14-24 592 0.027 1: 0.003

< 0.005 08-14-24 621 0.011 1: 0.002

<0.012 02-21 -24 574 0.028 :t 0.003

< 0.012 08-21-24 627 0.018 :t 0.002

<0.009 02-28-24 398 0.028 :t 0.004

< 0.019 08-28-24 636 0,030 t 0.003

< 0.006 03-07-24 740 0.017 :t 0.002

< 0.006 09-04-24 600 0.018 t0.003

<0.008 03-13-24 556 0.016 t 0.003

< 0.005 09-11-24 630 0.019 :t 0.003

<0.007 03-20-24 654 0,018 :t 0,003

< 0.005 09-18-24 622 0.036 :t 0.003

< 0.006 03*27-24 628 0.015 :t 0,002

< 0.007 09-25-24 604 0.030 t 0.003

< 0.004 04--03-24 653 0.020 :t 0.002

< 0.010 10-02-24 621 0,014 :t 0.002

< 0.006 10 2024 Mean+/- s.d.

0.021 :t0.006

< 0.019 30.2024 Mean+/- s.d.

0.021 +/- 0.007

<0,012 04-10-24 655 0.010 :t 0,002

< 0.006 10--09-24 627 0.023 t 0.003

< 0.006 04.17.24 632 0.017 :t 0.003

< 0.005 10-16-24 600 0.012 t 0.002

< 0.009 04-24-24 678 0.013 t 0.002

< 0.005 10-23-24 530 0.041 :t 0.004

< 0.006 05-01-24 637 0.019 +/- 0.003

<0,011 10-30-24 614 0.027 +/- 0.003

< 0.003 05-08-24 658 0.014 t 0.002

< 0.006 11-06-24 619 0.018 :t 0.003

< 0.009 05-14-24 561 0.013 -+/- 0.003

< 0.006 11-13-24 600 0.017 :t 0.003

< 0.005 05-22-24 714 0.020 +/- 0.002

< 0.007 11-20-24 586 0, 030 :t 0.003

< 0.006 05-29-24 632 0.016 :t 0.002

< 0.010 11-27-24 600 0.016 t 0.003

< 0.009 06-05-24 643 0.016 +/- 0,002

< 0.006 12-04-24 637 0.026 t 0.003

< 0.005 06-12-24 629 0.009 :t 0.002

< 0.008 12-11-24 579 0.027 t 0.003

< 0.007 06-19-24 603 0.024 t 0,003

< 0.006 12-18-24 597 0.031 :t 0.003

< 0.009 06-26-24 633 0.031 +/- 0.003

< 0.008 12-25-24 611 0.026 :t 0.003

< 0.010 07-03-24 620 0.009 +/- 0,002

< 0.008 01 25 586 0.027 +/- 0.003

< 0.013 20 2024 Mean :t:s.d.

0.016 i 0.006

< 0.011 40 2024 Mean+/- s.d.

0.025 +/- 0.008

< 0.013 Cumulative Average 0.021

Annual Radiological Environmental Operating Report YEAR: 2024 Page 63 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particulates and charcoal canisters, analyses for gross beta and iodine-131.

Location:

p.5 Unils: pCi/m l Collection: Continuous, weekly exchange.

Date Volume Date Volume Collecled (m")

Gross Bela 1-131 Col ected (mJ)

Gross Beta 1-131 Reguired LLD 0.0075 0.050 0.0075 0.050 01 24 597 0.020 :t 0.003

< 0.009 07-10-24 516 0,025 :t 0.003

<0.007 01 24 576 0.035 :t 0.003

<0.009 07-17-24 472 0.019 :t 0.003

<0.008 01 24 576 0,025 :t 0.003

< 0.009 07-24-24 493 0.022 :t 0.003

< 0.007 01 24 515 0,006 :t 0,002

< 0,014 07-31-24 469 0.023 :t 0.003

<0.009 02-07-24 559 0.018 :t 0.003

< 0.010 08-07-24 446 0.031 :t 0,004

<0.006 02-14-24 661 0,023 +/- 0.003

<0.005 08-1 4-24 527 0.012 :t 0.003

< 0.014 02-21 -24 616 0,025 :t 0.003

< 0.011 08-21 -24 504 0.020 ::t: 0.003

< 0.011 02-28-24 639 0,030 +/- 0.003

< 0.012 08-28-24 492 0.032 ::t: 0.004

< 0.008 03,06-24 611 0,020 :t 0.003

< 0.007 09-04-24 493 0.021 ::t: 0.003

< 0.009 03-1 J.24 595 0,015 :t 0.003

< 0.005 09-11-24 516 0.021 :t 0.003

< 0.009 03-20-24 596 0.019 :t 0.003

< 0.006 09-18*24 456 0.041 +/- 0.004

< 0.008 03-27-24 576 O.D15 :t 0.003

< 0.007 09-25-24 450 0.032 +/- 0.004

<0.006 04-03-24 599 0.022 :t 0.003

< 0.01 1 10-02-24 455 0.016 +/- 0.003

< 0.009 10 2024 Mean +/- s.d.

0.021 +/- 0.007

< 0.014 30 2024 Mean :t s.d.

0.024 +/- 0.008

< 0.014 04-10-24 546 0.011 +/- 0.003

< 0.007 10-09-24 484 0.025 +/- 0.003

< 0.008 04-17-24 572 0.017 +/- 0.003

< 0,005 10-16-24 462 0.014 :t 0.003

< 0.012 04-24-24 570 0,014 :t 0.003

< 0.006 10-23-24 420 0.044 :t 0.004

< 0.007 05-01 -24 579 0.020 :t 0.003

< 0.012 10,30-24 494 0.028 :t 0,004

< 0.004 05-08-24 555 0.015 :t 0.003

< 0.007 11-06-24 480 0.022 :t 0.003

< 0.012 05-14-24 471 0.015 :t 0.003

< 0.007 11-13-24 540 0.020 :t 0,003

< 0.005 05-22-24 623 0.023 :t 0.003

< 0.007 11-20-24 513 0.029 +/- 0.003

< 0.007 05-29-24 544 0.018 :t 0.003

< 0.01 1 11-27-24 466 0,024 :t 0,004

< 0.012 06-05-24 531 0.016 :t 0.003

< 0.007 12*04*24 556 0,024 +/- 0.003

< 0.005 06-12-24 541 0.010 :t 0.003

<0,010 12-11 -24 512 0.031 :t 0.003

< 0.008 06-19-24 553 0.025 :t 0.003

< 0.007 12-18-24 526 0,028 :t 0.003

< 0.010 06-26-24 522 0.028 :t 0.003

< 0.009 12-25-24 507 0,027 :t 0,003

< 0.012 07-03-24 523 0.011 :t 0.003

< 0.009 01 25 526 0,027 +/- 0.003

< 0.0 15 20 2024 Mean+/- s.d 0.017 +/- 0.006

< 0.012 40 2024 Mean+/- s d.

0.026 +/- 0.007

< 0.015 Cumulative Average 0.022 2-4

Annual Radiological Environmental Operating Report YEAR: 2024 Page 64 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particulales and charcoal canisters. ar1alyses for gross beta aocl iodine-131.

Location:

P-6 Units: pCilm 3 Collection: Continuous. weekly exchange.

Date Volume Dale Volume Collected (m~)

Gross Beta 1-131 Collected (m")

Gross Beta 1-131 Reguired,LLO 0.0075 0.050.

0.0075 0.050 01 24 576 0.027 :t 0.003

< 0.009 07-10-24 595 0.024 +/- 0.003

< 0.006 01-17-24 567 0.037 :t 0.003

< 0.009 07-17-24 610 0.020 :t 0.003

< 0.006 01 *24*24 550 0.031 :t 0.003

<O.o10 07*24*24 616 0.025 :t 0.003

< 0.006 01 24 597 0.009 :t 0.002

<O.o12 07*31 -24 621 0.021 +/- 0.003

< 0.007 02-07-24 512 0.023 :t 0.003

< 0.010 08-07-24 581 0.023 +/- 0.003

< 0.004 02-14-24 521 0.026 :t 0.003

< 0.006 08-14-24 637 0.014 +/- 0.002

<0.012 02-21 -24 495 0.028 :t 0.003

< 0.014 08-21 -24 625 0.022 +/- 0.003

< 0.009 02-28-24 528 0.034 :t 0.003

< 0.014 08-28-24 586 0.036 +/- 0.003

< 0.007 03-06-24 519 0.022 :t 0.003

< 0.009 09-04-24 608 0.023 +/- 0.003

< 0.008 03-13-24 525 0.017 :t 0.003

< 0.006 09-11 -24 589 0.021 +/- 0.003

< 0.008 03-20*24 524 0.022 :t 0.003

< 0.007 09-18-24 558 0.039 +/- 0.003

< 0.006 03-27-24 493 0.017 :t 0.003 c 0.008 09-25-24 631 0.032 +/- 0.003 C 0.004 04-03-24 590 0.027 :t 0.003

< 0.011 10-02-24 641 0.014 +/- 0.002

< 0.006 10 2024 Mean+/- s.d.

0.025 +/- 0.008

<O.o14 30 2024 Mean :ts.d.

0.024 +/- 0.007

< 0.012 04-10-24 593 0.011 :t 0.002

< 0.006 10-09-24 582 0.025 +/- 0.003

< 0.007 04-17-24 590 0.022 t 0.003 C 0.005 10-16-24 612 0.014 +/- 0.003

< 0.009 04-24*24 572 0.016 :t 0.003

< 0.006 10-23-24 604 0.043 +/- 0.003

< 0.005 05-01 -24 581 0.023 :t 0.003

< 0.012 10-30-24 538 0.028 +/- 0.003

< 0.004 05-08-24 625 0.017 :t 0.002

< 0.006 11 24 578 0.020 +/- 0.003

< 0.010 05-14-24 515 0.015 :t 0.003

< 0.007 11-13-24 595 0,017 +/- 0.003

< 0.005 05-22-24 693 0.024 :t 0.003 C 0.007 11 24 569 0.033 +/- 0.003

< 0.007 05-29-24 671 0.021 t 0.003

<0.009 11-27-24 577 0.020 :t 0.003

< 0.009 06-05-24 650 0.017 :t 0.003

< 0.006 12*04*24 574 0.026 +/- 0.003

< 0.005 06-12-24 675 0.010 :t 0.002

< 0.008 12-11 -24 61 1 0.034 +/- 0.003

< 0.008 06-19-24 621 0.023 :t 0.003

< 0.006 12*18-24 609 0.031 :t 0.003

< 0.008 06-28-24 627 0.032 :t 0.003

< 0.008 12-25-24 560 0.028 +/- 0.003

< 0.01 1 07-03-24 634 0.012 :t 0.002

< 0.007 01 25 675 0.027 +/- 0.003

< 0.01 1 20 2024 Mean -t: s.d.

0.019 :t 0.006

< O.o12 4Q 2024 Mean :t s.d.

0.027 :t 0.008

< 0.01 1 Cumulative Average 0.024 2-5

Annual Radiological Environmental Operating Report YEAR: 2024 Page 65 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particulates and charcoal canisters. analyses for ~oss beta and iodine-131.

Location:

p.7 Units: pCi/m 3 Collection: Continuous. weekly exchallQe Date Volume Date Volume Collected (mJ)

Gross Bela 1-131 Collected

{mi Gross Beta 1-131 R~uired LLQ 0.0075 0.050 0.0075 0.050 01 24 558 0.023 :t 0.003

< 0.009 07-10-24 560 0.030 :t 0.003

< 0.006 01-17-24 533 0.038 :t 0.003

<0.009 07-1 7-24 546 0.016 +/- 0.003

< 0.007 01-24-24 502 0.028 :t 0.003

< 0.010 07-24-24 547 0.023 :t 0,003

< 0.007 01 24 528 0,009 :t 0.002

< 0.014 07-31 -24 54a 0.022 :t 0.003

< 0.008 02-07-24 561 0.020 :t 0.003

< 0.010 08-07-24 469 0.031 :t 0,004

< 0.005 02-14-24 539 0.027 :t 0.003

< 0.006 08-14-24 494 0.016 :t 0.003

<O.o15 02-21 -24 558 0.025 :t 0.003

< 0.012 08-21-24 504 0.027 :t 0.003

< 0.011 02-28-24 538 0,032 :t 0.003

< 0.014 08-28-24 509 0.040 +/- 0,004

< 0.008 03-06-24 555 0.021 :t 0.003

< 0.008 09-04-24 512 0.023 :t 0.003

< 0.009 03-13-24 528 0,017 :t 0.003

< 0.006 09-11-24 523 0.023 :t 0.003

< 0.009 03-20-24 523 0.022 :t 0.003

< 0.007 09-1 8-24 509 0.040 :t 0.004

< 0.007 03-27-24 506 0.018 :t 0.003

< 0.008 09-25-24 473 0.048 :t 0.004

< 0.005 04-03-24 6-33 0.024 :t 0.003

<0.01 0 10-02-24 483 0.020 :t 0,003

< 0.008 1Q 2024 Meant s.d.

0.023 +/- 0.007

< 0.01 4 30 2024 Mean ts.d.

0.028 +/- 0.010

< 0.015 04-10-24 608 0.012 :t 0.002

< 0.006 10-09-24 492 0.029 :t 0.003

< 0.008 04-17-24 615 0.019 :1: 0.003

< 0.005 10-16-24 565 0.018 :t 0.003

< 0.010 04-24-24 648 0.016 :t 0.003

< 0.005 10-23-24 610 0,040 t 0,003

< 0.005 05-01 -24 601 0.020 +/- 0.003

< 0.01 1 10-30-24 567 0.038 :t 0.003

< 0.003 05-08-24 613 0.017 :t 0.003

< 0.006 11-06-24 582 0.025 :t 0.003

< 0.010 05-14-24 531 0.014 +/- 0,003

< 0.007 11-13-24 569 0.022 :t 0.003

< 0.005 05-22-24 667 0.019 :t 0.003

< 0.007 11-20-24 569 0,034 :t 0.003

< 0.007 05-29-24 599 0.018 +/- 0.003

< 0.011 11-27-24 578 0.021 :t 0,003

< 0.009 06-05-24 593 0.D18 :t 0.003

< 0.007 12-04-24 577 0.034 :t 0.003

<0.005 06-12-24 586 0.010 +/- 0.002

< 0.009 12-1 1-24 561 0.043 :t 0.003

< 0.007 06-19-24 532 0.023 :t 0,003

< 0.007 12-18-24 570 0.043 :t 0.003

< 0.009 06-26-24 554 0.035 :t 0.003

< 0.009 12-25-24 571 0.029 :t 0.003

<0.01 1 07-03-24 554 0.013 +/- 0.003

< 0.008 01 25 527 0,033 :t 0.003

< 0.015 20 2024 Mean +/- s.d 0.018 +/-0.006

< 0.011 40 2024 Mean+/- s.d.

0.031 +/- 0.008

< 0.015 Cumulative Average 0.025 2-6

Annual Radiological Environmental Operating Report YEAR: 2024 Page 66 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 2.

Airborne particulates and charcoal canisters; analyses for gross beta and iocline-131.

Location:

p.35 Units: pCiJm 3 Collection: Continuous, weekly exchange Date Volume Date Volume Collected

!m"}

Gross Beta 1-1 31 Collected

!mJl Gross Bela 1-1 31 Reguired LLD 0,007i 0.050

~

Q.Q!2!l 01-10-24 605 0.022 t 0.003

< 0.006 07-10-24 554 0.029 +/- 0.003

< 0.007 01-17-24 572 0.036 +/- 0.003

< 0.005 07-17-24 514 0.018 +/- 0.003

< 0.004 0 1-24-24 557 0.026 :t 0.003

< 0.006 07-24-24 539 0.021 +/- 0.003

< 0.007 01-31-24 582 0.007 t 0.002

< 0.007 07-31-24 536 0.022 +/- 0.003

< 0.007 02-07-24 584 0.021 :t 0.003

<0.007 08-07-24 528 0.027 +/- 0.003

< 0.006 02-1 4-24 591 0.027 :t 0.003

< 0.005 08-1 4-24 526 0.013 +/- 0.003

< 0.008 02-21-24 585 0.027 :t 0.003

< 0.006 08-21-24 536 0.020 +/- 0.003

< 0.007 02-28-24 567 0.031 :t 0.003

< 0.005 08-28-24 547 0.037 +/- 0.003

< 0.006 03-06-24 585 0.020 :t 0.003

<0.005 09*04-24 519 0.021 +/- 0.003

< 0.008 03-13-24 566 0.021 :t 0.003

<0.006 09*11-24 544 0.023 +/- 0.003

< 0.008 03-20-24 57.2 0.020 :t 0.003

<0.006 09-18-24 528 0.043 :t 0.004

< 0.005 03-27-24 566 0.017 :t 0.003

<0.006 09-25-24 526 0.033 +/- 0.003

< 0.004 04-03-24 597 0.023 :t 0.003

<0007 10-02-24 534 0.024 :t 0.003

< 0.006 10 2024 Mean :ts.d.

0.023 :t: 0.007

< 0.007 302024 Mean :t s.d.

0.025 +/-0.008

< 0.008 04-10-24 565 0.010 :t 0.003

< 0.004 10-09-24 516 0.026 +/- 0.003

< 0.007 04-17-24 562 0.019 +/- 0.003

< 0.004 10-16-24 556 0.013 :t 0.003

< 0.006 04-24*24 597 0.016 :t 0.003

< 0.006 10-23-24 657 0.036 +/- 0.003

< 0.003 05-01 -24 550 0.026 +/- 0.003

< 0.012 10-30-24 590 0.030 t 0.003

< 0.004 05-08-24 567 0.016 +/- 0.003

< 0.007 11-06-24 439 0.030 +/- 0.004

< 0.009 05-14-24 492 0.015 +/- 0.003

< 0.006 11-1 J-24 550 0.027 +/- 0.003

< 0.003 05-22-24 618 0.020 +/- 0.003

< 0.006 11-20-24 532 0.048 ::1: 0.004

< 0.006 05-29-24 549 0.021 +/- 0.003

< 0.011 11-27-24 538 0.030 +/- 0.003

< 0.009 06-05-24 547 0.024 +/- 0.003

< 0.008 12-04-24 545 0.035 ::1: 0.003

< 0.010 06*12*24 547 0.012 t 0.003

< 0.007 12-11 -24 531 0.046 :t 0.004

< 0.007 06-19-24 515 0.022 +/- 0.003

< 0.007 12-18-24 528 0.051 ::1: 0.004

< 0.003 06-26-24 540 0.036 +/- 0.003

< 0.006 12*25-24 536 0.042 :t 0.004

< 0.008 07-03-24 536 0.013 :t 0.003

< 0.005 01-01-25 535 0.040 :t 0.004

< 0.011 2Q 2024 Mean +/-s.d.

0.0,9 :t 0.007

< 0.012 4Q 2024 Mean +/- s.d.

0.035 +/- 0.011

< 0.011 Cumulative Average 0.026 2*7

Annual Radiological Environmental Operating Report YEAR: 2024 Page 67 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 3.

Airborne particulates. analyses for gamma-emitting isotopes.

Collection: Quarterly Composite Units: pCi/m3 Location PE-1 Quarter 1st Otr.

2nd Otr.

3rd Ctr.

4th Otr.

R~. llD Lab Code PEAP

• 862 PEAP

• 1726 PEAP

• 2766 PEAP

• 3371 Vol. (m 3) 6434 6726 7954 6810 Be-7 0.056 :t 0.007 0.077 :t 0.010 0.062 +/- 0.010 0.033 t 0.006 Co-58

< 0.0005

< 0.0003

< 0.0004

< 0.0003 Co-60

< 0.0006

< 0.0005

< 0.0005

< 0.0001 Cs-134

< 0.0004

< 0.0006

< 0.0004

< 0.0003 0.005 Cs-137

< 0.0005

< 0.0003

< 0.0004

< 0.0005 0.045 location PE-3 lab Code PE.AP* 863 PeAP. 1727 PEAP

• 2767 PEAP

• 3372 Vol. (m 3) 8159 8130 6603 8248 Be-7 0.053 :t 0.008 0.064 :t 0.008 0.058 +/- 0.009 0.043 :t 0.007 Co-58

< 0.0003

< 0.0002

< 0.0004

< 0.0003 Co-60

< 0.0005

< 0.0004

< 0.0003

< 0.0003 Cs-134

< 0.0004

< 0.0004

< 0.0005

< 0.0004 0.005 Cs-137

< 0.0004

< 0.0004

< 0.0003

< 0.0004 0.045 location PE-4 Lab Code PEAP

• 864 PEAP

• 1728 PEAP

• 2768 PEAP

• 3373 Vol. (m 3) 7774 8295 8057 7798 Be-7 0.047 :t 0.007 0.051 +/- 0.007 0.065 t 0.008 0.033 :t 0.007 Co-58

< 0.0003

< 0.0002

< 0.0004

< 0.0004 Co.SO

< 0.0004

< 0.0004

< 0.0003

< 0.0005 Cs-134

< 0.0004

< 0.0004

< 0.0004

< 0.0002 Cs-137

< 0.0005

< 0.0004

< 0.0005

< 0.0005 Location PE-5 Lab Code P.EAP. 865 PEAP. 1729 PEAP

• 2769 PEAP. 3374 Vol. {m3) 7724 7132 6309 6508 Be-7 0.043 +/- 0.007 0.052 +/- 0.010 0.070 +/- 0.009 0.036 +/- 0.010 Co-58

< 0.0002

< 0.0005

< 0.0005

< 0.0004 Co-60

< 0.0005

< 0.0005

< 0.0004

< 0.0005 Cs-134

< 0.0005

< 0.0005

< 0.0005

< 0.0005 0.005 Cs-137

"'0.0003

"'0.0003

< 0.0005

< 0.0005 0.045 3-1

Annual Radiological Environmental Operating Report YEAR: 2024 Page 68 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 3, Airborne particulates, arialyses for gamma-emitting isotopes.

Collection: Quarterly Composite Units: pCi/m3 location PE*6 Quarter 1st Otr.

2nd Cir.

3rd Otr.

4th Cir.

R~. LLD lab Code PEAP

• 867 PEAP

• 1730 PEAP

• 2770 PEAP

• 3375 Vol. (m3) 6997 8047 7898 7684 Be-7 0,056 +/- 0,009 0.066 +/- 0.009 0.068 +/- 0,010 0.030 +/- 0.0.05 Co-58

< 0.0004

< 0.0004

< 0,0006

< 0.0003 Co-60

< 0.0005

< 0.0005

< 0.0004

< 0.0001 Cs-134

< 0.0005

< 0.0004

< 0.0005

< 0.0003 0,005 Cs-137

< 0.0.006

< 0.0003

< 0.0003

< 0.0003 0.045 Location PE-7 lab Code PEAP

• 86B PEAP

• 1731 PEAP. 2771 PEAP

• 3376 Vol. (m3) 7062 7701 6677 7338

.Be-7 0.058 +/- O.o10 0.064 +/- 0.008 0.066 :t 0.011 0.043 +/- 0.007 Co-58

< 0.0004

< 0.0002

< 0.0004

< 0.0004 Co-60

< 0.0006

< 0.0006

< 0,0005

< 0.0005 Cs-134

< 0.0005

< 0.0004

< 0.0005

< 0.0004 0.005 Cs-137

< 0,0005

< 0,0003

< 0,0005

< 0.0005 0.045 Location PE-35 Lab Code PEAP

• 869 PEAP. 1732 PE:AP

• 2772 PEAP

• 3377 Vol. (m3) 7529 7185 6935 7053 Be-7 0.058 +/- 0.009 0,059 :t 0.006 0.071 +/- 0.009 0.055 +/- 0.011 Co-58

< 0.0003

< 0.0002

< 0.0005

< 0.0006 Co-60

< 0.0005

< 0.0004

< 0.0002

< 0.0002 Cs-134

< 0.0005

< 0.0003

< 0.0005

< 0.0007 0.005 Cs-137

< 0,0005

< 0.0004

< 0.0004

< 0.0005 0.045 3*2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 69 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 4. Lake waler, analyses for gross beta and gamma emitting isotopes.

PNPP Location: p.34 Collection: Mlonthly composiles Units: pCi/l Lab Cooe PELW* 102 PELW* 372 PELW* 579 PELW-995 Stan Date 12-19-23 01 24 02-20-24 03-19-24 Req. LLD End Date 01 24 02-20-24 03-19-24 04-25-24 Gross beta 1.1.t 0.5 1.1 +/- 0.6 2.0 !: 0.6 1.6 t 0.6 3.0 Mn-54

< 1.1

< 2.0

< 1.3

< 1.0 11 Fe-59

< 1.0 C 3.3

< 3.5 C 1.5 22 Co-58

< 1.0

< 2.5

< 1.8

< 1.0 11 Co-60

< 2.2

< 3.3

< 1.9

< 1.0 11 Zn-65

< 2.0 C 3.9 C 2.9

< 2.9 22 Zr-95

< 2.1

< 2.6

< 2.1

< 1.9 22 Nb-95

< 1.1

< 3.4

< 1.9

< 1.2 11 Cs-134

< 1.3

< 2.7

< 1.3

< 1.0 11 Cs-137

< 2.1

< 3.1

< 1.7

< 1.4 13 Ba-140

< 3.9

< 15.6

< 16.1

< 5.9 45 La-140

< 0.9

< 3.4

< 4.2

< 3.1 11 Lab Code PELW-1216 PELW* 1356 PELW* 1739 PELW* 2028 Start Date 04-25-24 05-21-24 06-18-24 07-23-24 Req. LLD End Date 05-21 -24 06-18-24 07-23-24 08-26-24 Gross beta 0.9 t 0.5

< 0.8 1.1 t 0.5

< 1.6 3.0 Mn*54 C 2.7

< 1.7

< 1.2

< 2.2 11 Fe-59

< 4.4

< 4.9

< 2.2 C 5.2 22 Co-58 C 3.3

< 2.0

< 2.2

< 3.2 11 Co-60

< 3.4

< 3.6

< 1.9

< 2.7 11 Zn-65

< 3.8

< 3.1

< 2.0

< 2.1 22 Zr-95

< 5.0

< 3.5

< 3.5

< 3.8 22 Nb-95

< 2.9

< 1.9

< 2.1

< 1.9 11 Cs-134

< 2.9

< 3.2

< 1.8

< 3.3 11 Cs-137

< 3.0

< 4.0

< 1.8

< 2.9 13 Ba-140

< 10.4

< 10.2

< 10.1

< 14.4 45 La-140

< 3.5

< 1.3

< 1.6

< 1.9 11 Lab Code PELW* 2272 PELW* 2623 PELW* 3006 PELW-3169 Stan Date 08-26-24 09-24-24 10-22-24 11-26-24 Req. LLD End Date 09-24-24 10-22-24 11-26-24 12-23-24 Gross bela

< 1.7 1.1+/-0.6

< 1.0 1.1 t 0.5 3.0 Mn-54

< 2.6

< 2.5

< 1.6

< 2.7 11 Fe-59

< 6.2

< 3.2

< 5.6

< 5.4 22 Co-58

< 2.4

< 3.8

< 2.1

< 2.7 11 Co-60

< 2.8

< 3.9

< 2.5

< 2.7 11 Zn-65

< 2.8

< 3.6

< 4.1

< 3.6 22 Zr-95

< 6.0

< 6.0

< 2.9

< 3.8 22 Nb-95 C 1.5

< 3.0

< 3.4

< 3.1 11 Cs-134

< 3.1

< 3.8

< 2.2

< 3.3 11 Cs-137

< 3.6

< 3.4

< 2.7

< 3.6 13 Ba-140

< 10.8 C 10.4

< 8.9

< 16.8 45 La-140

< 1.3

< 1.5

< 1.9

< 5.7 11 4-1

Annual Radiological Environmental Operating Report YEAR: 2024 Page 70 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 4. Lake water. analyses for gross beta and gamma emittif}j) isotopes.

PNPP Location: P-36 Colleclion: Monthly composites Units: pCi/L Lab Code PELW* 103 PELW* 373 PELW-S80 PELW-996 Start Date 12-19-23 01-24-24 02-20-24 03-19*24 Req. LLD End Date 01 24 02-20-24 03-19-24 04-25-24 Gross baa

< 0.9 0.9 ! 0.6 1.6.t 0.6 2.8.t 0.7 3.0 Mn-54

< 2.7

< 6.0

< 2.9

< 2.7 11 Fe-59

< 4.8

< 10.5

< 5.7

< 3.3 22 Co-58

< 1.5

< 2.9

< 2.3

< 1.9 11 Co-60

< 4.9

< 3.8

< 2.6

< 4.1 11 Zn-65

< 2.4

< 5.6

< 2.3

< 3.4 22 Zr-95

< 2.9

< 5.4

< 3.2

< 5.1 22 Nb-9S

< 2.4

< 6.6

< 3.4

< 3.2 11 Cs-134

< 3.1

< 5.6

< 2.7

< 2.8 11 Cs-137

< 4.7

< 4.3

< 2.9

< 3.9 13 Ba-140

< 15.3

< 21.5

< 23.6

< 27.8 45 l a-140

< 2.4

"'5.7

< 3.6

< 3.0 11 Lab Code PELW* 1217 PELW* 1357 PELW* 1740 PELW* 2029 Start Date 04-2S-24 OS-21-24 06-18-24 07-23-24 Req. LLD End Date 05-21-24 06-18-24 07-23-24 08-26-24 Gross beta 1.3 +/- 0.5

< 0.9 1.2 !0.5 1.7 t 0.8 3.0 Mn-54

< 4.3

< 4.3

< 1.5

< 5.4 11 Fe-59

< S.2

< 7.3

< 3.7

< 3.5 22 Co-58

< 6.6

< 38

< 2.5

< 4.0 11 Co-60

< 2.6

< 3.0

< 1.8

< 3.7 11 Zn-6S

< 4.7

< 6.9

< 3.7

< 10.7 22 Zr-95

< S.1

< 6.4

< 3.9*

< 9.3 22 Nb-95

< 6.4

< 3.8

< 2.2

< 5.1 11 Cs-134

< 5.3

< 5.6

< 2.6

< 5.4 11 Cs-137

< 4.0

< 3.7

< 2.6

< 5.2 13 Ba-140

< 27.3

< 23.7

< 12.4

< 18.1 45 la-140

< 6.0

< 3.9

< 2.9

< 7.0 11 lab Code PELW* 2273 PELW* 2624 PELW-3007 PELW-3170 Start Date 08-26-24 09-24-24 10-22-24 11 24 Req. LLD End Date 09-24-24 10-22-24 11 24 12-23-24 Gross beta

< 1.6

< 0.9

< 0.9 1.4 i 0.6 3.0 Mn-54

< S. 1

< 5.7

< 1.7

< 5.3 11 fe-59

< 4.S

< 5.4

< 3.0

< 9.9 22 Co-58

< 2.9

< 4.5

< 1.2

< 4.5 11 Co-60

"' S.2

< 6.1

< 1.9

< 4.3 11 Zn-65

< 7.1

< 4.7

< 3.0

< 6.8 22 z,.95

< 8.6 C 8.7

< 2.S

< 6.9 22 Nb-95

< 4.9 C 7.4

< 2.0

< 5.9 11 Cs-1 l4

< 4.7

< 6.2

< 1.5

< 5.0 11 Cs-137

< 6.2

< 6.2

< 1.9

< 5.2 13 Ba-140

< 14.6

< 14.7

< 11.9

< 32.8 45 La-140

< 4.2

< 7.3

< 2.8

< 8.6 11 4-2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 71 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Tal>le 4. Lake water, analyses for gross beta and gamma emitting rsotopes.

PNPP Location : p.39 Collection: Monthly composites Units: pCi/L Lab Code PELW-104 PELW-374 PELW* 581 PELW* 997 Start Date 12-19-23 0 1-24-24 02-20-24 03,19-24 Req. LLD End Date 01 24 02-20-24 03-19-24 04-25-24 Gross beta

< 0.9 1.2 t 0.6 1.5 +/- 0.6 1.7 t 0.6 3.0 Mn,54

< 1.1

< 2.0

< 1.0

< 3.7 t1 Fe-59

< 2.4

< 4.5

< 3.1

< 6.9 22 Co-58

< 1.1

< 2.1

< 1.3

< 3.7 11 Co-60

< 0.9

< 1.9

< 1.1

< 3.1 11 Zn-65

< 2.4

< 3.7

< 2.3

< 8.0 22 Zr-95

< 1.6

< 3.7

< 2.0

< 7.4 22 Nb-95

< 1.1

< 2.1

< 1.7

< 4.4 11 Cs-134

< 1.1 C 2.5

< 1. 1

< 5.7 11 Cs-137

< 1.1

< 2.1

< 0.9

< 4.4 13 Ba-140

< 3.1

< 14.4

< 12.1

< 35.2 45 la-140

< 1.4 C 4.4

< 1.5

< 3.8 11 Lab Code PELW* 1218 PElW* 1358 PELW* 1741 PELW* 2030 Start Date 04-25-24 05,21 -24 06-18-24 07-23-24 Req. llD End Date 05-21-24 06-18-24 07-23-24 08-26-24 Gross beta 1.4 +/- 0.5

< 0.9 1.2 +/- 0.6 C 1.5 3.0 Mn-54

< 1.6

< 2.5

< 1.5

< 1.7 11 fe-59

< 5.4

< 3.8

< 4.0

< 5.4 22 Co-58

< 1.7

< 2.3

< 1.7

< 2.4 11 Co,60

< 1.5

< 2.0

< 1.5

< 2.1 11 Zn-65

< 6.7

< 4.6

< 4.4

< 5.3 22 Zr-95

< 4.0

< 2.7

< 3.1

< 3.2 22 Nb-95

< 2.8

< 2.3

< 2.2 C 3.0 11 Cs-134

< 2.5

< 2.5

< 1.8

< 2.4 11 Cs,1 37

< 2.8

< 2.6

< 1.5

< 2.3 13 Ba-140

< 14.3

< 12.9

< 10.5

< 14.1 45 la-140

< 4.5

<,.9

< 2.5

< 3.1 11 Lab Code PELW* 2274 PElW* 2625 PELW-3008 PELW-3171 Start Date 08-26-24 09-24-24 10-22-24 11 24 Req. LLD End Date 09-24-24 10-22*24 11-26-24 12-23-24 Gross beta C 1.7

< 0.9 C 0.9 1.4 t 0.6 3.0 Mn-54

< 1.7 C 2.5

< 2.7 C 2.3 11 fe-59

< 3.2 C 3.5

< 6.4

< 3.8 22 Co-58 C 2.3 C 3.1 C 1.5

< 3.0 11 Co-60 C 1.5 C 2.2 C 3.0

< 1.8 11 Zn-65

< 4.1

< 3.1

< 6.0

< 4.6 22 Zr-95

< 4.4

< 5.0

< 5.7

< 4.0 22 Nb-95

< 1.8

< 1.7

< 1.9

< 3.5 11 Cs-134

< 2.5

< 3.2

< 3.1

< 2.4 11 Cs,137

< 1.9

< 3.0

< 3.7

< 2.3 13 Sa-140

< 9.6

< 14.2

< 34.3

< 20.2 45 La-140

< 2.3

< 2.5

< 5.5

< 5.2 1\\

4.3

Annual Radiological Environmental Operating Report YEAR: 2024 Page 72 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 4_ Lake water. analyses for gross beta and gamma emitling isOlopes.

PNPP Location: p.59 Col ection: Monthly composites Unils: pCill Lab Code PELW* 106 PELW* 375 PELW* 582 PELW* 998 Start Date 12-19,.23 01-24-24 02-20-24 03-19*24 Req. LLD End Date 0 1-24-24 02-20-24 03-19-24 04-25-24 Gross beta

< 1.0 1.0.!. 0.5 1.8 t0.6 1.9 t 0_6 3.0 Mn-54

< 4.6

< 2.3

< 1.0

< 1_8 11 fe-59

< 7.1

< 5.6

< 2.5

< 6.0 22 Co-58

< 4.3

< 2.3

< 0.7

< 2_0 11 Co-60

< 5.0

< 1.9

< 1.2

< 2.1 11 Zn~65

< 6.4

< 5.5

< 2.4

< 5.4 22 Zr-95

< 9_3

< 5.2

< 2.4

< 4.9 22 Nb-95

< 6.2

< 2.4

< 1.9

< 2.6 11 Cs-134

< 4.2

< 2.2

< 1.0

< 2.4 11 Cs-137

< 4.9

< 2.5

< 1.3

< 2_7 13 Ba-140

< 10.7

< 18.6

< 1.6

< 18_3 45 La-140

< 2.4

< 6.4

< 3.9

< 1.8 11 Lab Code PElW* 1247

• PELW* 1359 PELW* 1742' PElW* 2031 Slart Date 04-25-24 05-21 -24 OM8*24 07-23-24 Req. LlD End Date 05-21 -24 06-18-24 07-23-24 08-26-24 G:ross beta 1.2 +/- 0.6 1.3 t 0.6 1.2 t0.5 1.5 +/- 0.8 3_0 Mn-54

< 1.2

< 1.9

< 1.7

< 2.1 11 fe-59

< 3.4

< 4.7

< 4.7

< 3.9 22 Co-58

< 1.4

< 1.0 C 1.1

< 2.6 11 Co-60

< 2.2

< 2.9

< 1.2

< 2.3 11 Zn-65

< 2.9

< 3.3

< 4.5

< 4.0 22 Zr-95

< 3.0

< 5.6

< 4.1

< 4.1 22 Nb-95

< 2.3

< 2.1

< 2.0

< 2.9 11 Cs-134

< 1.9

< 2.3

< 1.8

< 2.1 11 Cs-137

< 2.4

< 2.6

< 2.0

< 2.5 13 Ba-140

< 13.7

< 9.1

< 12.7

< 10.5 45 La-140

< 2.3

< 2.7

< 3.1

< 3.5 11 Lab Code PElW* 2275 PElW-2626 PELW* 3009 PElW* 3172 Start Date 08-26-24 09-24-24 10-22-24 11-26-24 Req. LLD Eod Dale 09-24-24 10-22-24 11 24 12-23-24 Gross beta

< 1.7

< 0.9 0.9 +/- 0.5 1.4 t 0.5 3.0 Mn-54

< 2.1

< 2.6

< 2.2

< 2.5 11 Fe-59

< 2.6

< 6.8

< 3.5

< 2.1 22 Co-58

< 2.1

< 2.4

< 2.2

< 2.5 11 Co-60

< 2.1

< 2.7

< 1.5

< 2.1 11 Zn-65 C 4.0

< 4.4

< 5.0

< 4.5 22 Zr-95

< 4.8

< 5.6

< 5.3 C 5.1 22 Nb-95

< 2.3

< 3.5

< 2.4

< 2.5 11 Cs-134

< 2.2

< 2.8

< 2.7 C 2.6 11 Cs-137

< 2.5

< 2.5

-= 2.7

< 3.3 13 Ba-140

< 7.8

< 9.7

< 27.0

< 21.3 45 La-140

< 2.2

< 2.8

< 7.0

< 4.9 11

• eackop sample 4-4

Annual Radiological Environmental Operating Report YEAR: 2024 Page 73 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 4. Lake water. analyses ror gross beta and gamma emitting isotopes.

PNPP Location: P-60 Collection: Monlhl~ composites Units: pCifL Lab Code PELW* 107 PELW* 376 PELW* 5S4 PELW* 999 Start Date 12-19-23 0 1-24-24 02-20-24 03-19-24 Req LLD End Date 0 1-24-24 02-20-24 03-19-24 04-25-24 Gross beta 1.7 ! 0.6 1 0 ! 0.5

< 1.0 1.8 ! 0.6 3.0 Mn-54

< 0.8

< 1.1

< 1.0

<14 11 Fe-59

< 1.3

< 2.1

< 4.8

-c. 4.3 22 Co-58

< 0.8

< 0.6

< 1.6

< 1.1 11 Co-60

< 1.3

< 1.2 C 2.2

< 1.9 11 Zfl-65

< 2.1

< 2.1

< 3.5

<: 4.0 22 Zr-95

< 1.9

< 2.2

-c. 3.6

-c. 5.0 22 Nb-95

< 1.3

< 1.6

< 2.2

< 2.7 11 Cs-134

< 0.9

< 1.1

< 2.0

< 2.0 11 Cs-137

< 1.3

< 1.3

< 2.3

-c. 2.6 13 Ba-140

< 3.8

< 8.6

< 19.1

< 18.5 45 La-140

< 1.2

< 2.1

< 2.4

< 4.3 11 Lab Code PELW* 1219 PELW* 1360 PELW* 1743 PELW* 2032 Start Date 04-25-24 05-21 -24 06-18-24 07-23-24 Req. LLD End Date 05-21 -24 06-18-24 07-23-24 08-26-24 Grossbera 1.4 t0.6

< 1.0 1.2 :t 0.6

< 1.5 3.0 Mn-54

< 1.2

< 3.1

< 1.6

< 2.6 11 Fe-59

< 4.8

< 4.6

-c. 3.9

< 4.1 22 Co-58

< 0.9

< 2.3

< 2.0

< 1.3 11 Co-60

< 1.7

< 3.7

< 2.1

< 2.5 11 Zn-65

-c 4.8

< 3,4

< 4.9

< 2.6 22 Zr-95

< 2.9

< 6.3

< 3.4

< 4.5 22 Nb-95

< 2.9

< 2.0

< 2.1

< 1.5 11 Cs-134

< 2.2

< 3.0

< 1.8

< 2.8 11 Cs-137

< 2.7

< 3.9

< 1.9

< 3.4 13 Ba-140

< 10.4

< 11.0

< 6.4

< 19.3 45 La-140

< 4.1

-c. 1.2

< 2.9

< 1.5 11 Lab Code PELW-2276 PELW* 2628 PELW* 3010 PELW-3174 Start Dale 08-26-24 09-24-24 10-22-24 11-26-24 Req. LLD End Date 09-24-24 10-22-24 11 24 12-23-24 Gross beta

< 1.8 1.0 t 0.6

< 0.9 1.2 t 0.7 3.0 Mn-54

< 2.5

< 2.6

< 1.9

< 2.0 11 Fe-59

< 3.8

< 6.0

< 7.3

< 5.3 22 Co-58

< 2.2

< 1.9

< 3.2

< 2.1 11 Co-60

< 1.3

< 4.3

< 3.7

< 2.7 11 Zn-65

< 5.6

< 5.3 C 5.9

< 4.6 22 Zr-95

< 4.2 c 72

< 4.8

< 4.6 22 Nb-95

< 2.0 c 2.6

< 4.7

< 2.5 11 Cs-134

< 2.8

< 3.7 c 3.3

< 2.2 11 Cs-137

< 3.3 c 52

< 4.0

< 3.0 13 Sa-140 C 13.0

< 12.6

< 37.4 C 19.4 45 La-140

< 1.9 c t.4

< 7.8

< 3.6 11 4.5

Annual Radiological Environmental Operating Report YEAR: 2024 Page 74 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 4. Lake Water. anatysis for tritium.

Collection; Quarterly compositss or monthly collections.

Units: pCi/L Required limit of detectioo:

150OpCi/L Location p.34 Period 1st Ctr.

2nd Cir.

3rd Otr.

41h Otr.

Lab Code PELW* 787 PELW-1417 PELW-2277 PELW* 3206 H-3

< 171

< 183

< 180

< 183 Location P-36 Period 1st Qtr.

2nd Cir.

3rd Otr.

4th Olr.

Lab Code PELW* 788 PELW, 1418 PELW* 2278 PELW* 3207 H-3

< 171

< 183

< 180

< 183 Location p.39 Period 1st Qtr.

2nd QIJ.

3rd a 1r.

4th Otr.

Lab Code PELW* 789 PELW* 1419 PELW* 2279 PELW* 3208 H-3

< 171

< 183

< 180

< 183 Location P-59 Period 1st atr.

2nd Q1r.

3fd Otr.

4th Qlr.

Lab Code PELW-790 PELW* 1420 PELW* 2280 PELW* 3209 H-3

< 171

< 183

< 160

< 163 Location P-60 Period 1st Cir.

2nd O!r.

3rd Otr.

41h Otr.

Lab Code PELW* 791 PELW* 1421 PELW* 2261 PELW* 3210 H-3

< 171

< 183

< 180

< 163 4*6

Annual Radiological Environmental Operating Report YEAR: 2024 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 7. Food Products. analyses ror gamma erritting isotopgs.

Collection: Monthly Location: p.7 (New garden)

Lab Code PEVE* 2101 Date Collected 09-10-24 Sample Type Turnip Greens Be-7 643 :t 133 K-40 3393 :t 300 Co-58

<9 Co-60

< 6 1-131

< 12 Cs-134

< 8 Cs-137

< 12 Lab Code PEVE* 2432 Date Collected 10-08-24 Sample Type Kale ee-7 612 :!: 156 K-40 7255 :t 473 Co-58

< 17 Co-60

< 13 1-131

< 23 Cs-134

< 16 Cs-137

< 19 PEVE* 2102 PEVE* 2103 09-10-24 09-10-24 Kale Swiss Chard 1598 :t 240

< 163 11102 :t 549 5762 :t 533

< 17

< 10

< 21

< 12

< 35

< 26

< 19

< 18

< 19

< 18 PEVE* 2433 10-08-24 sw;ss Chard

< 202 5401 :t 582

< 22

< 16

< 31

< 24

< 18 7-1 Units: pCi/kg wet PEVE-2431 10-08-24 Turnip Greens 278 :t 91 5374 :t 350

< 8

< 10

< 14

< 9

< 9 Page 75 of 82 PNPP Req. LLD 45 45 60 Req. LLD 45 45 60

Annual Radiological Environmental Operating Report YEAR: 2024 Page 76 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Tab.le 7. Food Products. analyses for gamma emitting isotopes.

Collection: Monlhly Units: pCilkgwet Location: P,16 lab Code PEVE-1582 PEVE-1563 PEVE-1564 PEVE* 1565 Date Collecled 07-09-24 07-09-24 07-09-24 07-09-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7 463 :I: 129 218 t. 81 oe. 95 273:t115 K-40 4542 :t 356 3565 :I: 260 2813.t 260 5256.t 38-9 Co-5<1

< 10

"' 9

,c, -g

< 13 Co-60

< 12

"'7

<9 C 17 1-131

< 18

"'7

"' 11

< 22 45 Cs-134

< 11

"'8

< 8

"' 13 45 Cs-137

< 11

< 9

< 8

< 19 60 lab Code PEVE* 1908 PEVE* 1909 PEVE-1910 PEVE* 1911 Date Collected 08-13-24 06-1 3-24 08-13-24 08-13-24 Req. LLD Sample Type Tumip Greens Collard Greens Kale Swiss Chard Be-7 188 :I: 75

< 156 291.t 166 216.!! 88 K-40 3744 :t 209 4007 :1: 363 3474 +/- 364 4947.!! 352 Co-58

< 8

< 11

< 11

<6 Co-60

< 7

< 17

< 15

,c 9 1-131

< 10

< 24

< 19

<: 17 45 Cs-134

"'1

< 14

< 15

"' 11 45 Cs-137

< 9

< 16

< 19

"' 11 60 Lab Code PEVE* 2104 PEVE* 2105 PEVE* 2106 PEVE* 2107 Date Collected 09-10-24 09-1 0-24 09-10-24 09-10-24 Req. LLD Sample Ty,pe Turnip Greens Collard Greens Kale Swiss Chard Be-7 1061 :I: 149 644 t 246 300 :1: 151 416 :1: 194 K-40 5239 +/- 377 4202 :1: 508 3600 :1: 463 4580.!! 596 Co-5<1

< 9 c 18

< 18

< 30 Co-60

<. 22

"'27

< 23

< 18 1-131

< 28

< 32

< 26

< 21 45 Cs-134

< 16

<: 23

< 21

< 24 45 Cs-137

< 20

<: 28

< 27

< 24 60 Lab Code PEVE* 2434 PEVE-2435 PEVE* 2436 PEVE* 2437 Date Collected 10-08-24 10-08-24 10-08-24 10-08-24 Req UD Sample Type Turnip Greens Colla rd Greens Kale Swiss Chard Be-7 533 +/- 153

< 123 318 :t 123 711 :1: 227 K-40 7979 :t 491 5180 t. 399 5566 +/- 392 6370 :!: 551 Co-58

"' 17

,c 7

< 8

< 18 Co-60

"' 18

< '2

< 13

< 23 1-131

< 30 C 23

< 27

< 34 45 Cs-134 C 18

< 14

< 16

< 18 45 Cs-137 C 21

< 13

< 15

< 21 60 7-2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 77 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 7. Food Products. analyses for gamma emnting isolopes.

Collection: Monthly Units: pCi/lc.gwet Location: P-20 labCO<le PEVE* 1566 PEVE* 1567 PEVE* 1568 p.eve-1569 Date Collected 07-09-24 07-09-24 07-09*24 07-09-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7 301 :t 117

< 148

< 94

< 150 K-40 5025 :t 453 5387 :t 459 4607 :t 331 5702 +/- 616 Co-58

< 13

< 13 C 10

< 17 Co-60

< 19

< 15

< 13

< 17 1-131

< 27

< 15

< 15

< 20 45 Cs-134

< 17

< 16

< 12

< 21 45 Cs-137

< 20

< 11

< 6

< 21 60 Lab Code PEVE* 1912 PEVE* 1913 PEVE* 1914 PEVE* 1915 Date Collected 08-13-24 08-13-24 08-13-24 08-13-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7 257 :t 91

< 199 117 :t 65 238 :t 126 K-40 4787 :t 322 3456 +/- 486 5167 +/- 245 4281 +/- 355 Co-58

< 11

< 10

< 7

< 12 Co-60

< 9

< 8

< 8

< 11 1-131

< 12

< 28

< 12

< 13 45 Cs-134

< 9

< 19

< 7

< 13 45 Cs-137

< 11

< 16

< 6

< 15 60 Lab Code PEVE* 2108 PEVE* 2109 PEVE* 2110 PEVE* 2111 Date Collected 09-10-24 09-10-24 09-10-24 09*10-24 Req. LLD Sample Type Tumip Greens Collard Greens Kale Swiss Chard Be-7 433 :t 46 407 +/- 237

< 82 558 :t 169 K-40 3356 +/- 106 4826 +/- 590 4967 +/- 382 4620 +/- 404 Co-58

< 3

< 20

< 11

< 14 Co-60

< 4

< 13

< 7

< 14 1-131

< 7

< 44

< 18

< 22 45 Cs-134

< 3

< 21

< 14

< 15 45 Cs-137

<4 C 24

< 15

< 15 60 Lab Code PEVE* 2439 PEVE* 2440 PEVE* 2441 PEVE* 2442 Date Collected 10-08-24 10-08-24 10-08-24 10-08-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7

< 303 221 t 80

< 102

< 179 K-40 6223 +/- 7J.6 5491 t 292 5112 +/- 400 5570 +/- 407 Co-56

< 25

< 11

< 10

< 11 Co-60

< 32

< 10

< 11

< 11 1-131

< 43

< 15

< 17

< 23 45 Cs-134

< 31

< 9

< 11

< 13 45 Cs-137

< 27

< 5

< 10

< 15 60 7-3

Annual Radiological Environmental Operating Report YEAR: 2024 Page 78 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 7. Food Products. an.alyses for gamma emitting isotopes.

Colleclion: Monlhly Units: pCilkg\\11/'et Location: p.37 Lab Code PEVE-1570 PEVE* 1571 PEVE* 1573 PEVE* 1574 Date Collecled 07-()9-24 07-09-24 07-09*24 07-09*24 Req. LLD Sample Type Turnip Greet1s Collard Greens Kale Swiss Chard Be-7

< 201

< 107

< 98 274 +/- 90 K-40 4653 +/- 580 4580 +/- 412 4670 +/- 335 5479 +/- 360 Co-58

< 15

< 9

< 11

< 11 Co-60

< 22

< 11

< 7

< 8 1-131

< 17

< 13

< 22

< 12 45 Cs-134

< 19

< 13

< 10

< 11 45 Cs-137

< 21

< 14

< 10

< 14 60 Lab Code PEVE-1916 PEVE* 1918 PEVE* 1919 PEVE-1920 Date Collected 08-13-24 08-1 3-24 08-13-24 08-1l-24 Req. LLO Sample Type Turnip Greens Collard Greet1s Kale SlMss Chard Be-7 260 :t 96

< 221

< 100

< 122 K-40 6055 :t 385 4435 +/- 540 4798 t 331 4943 t 409 Co-58 C 9

< 27

< 13

< 9 Co-60

< 9

< 16

< 13

< H 1-131 C 16

< 31

< 16

< 12 45 Cs-134

< 12

< 21

< 12

< 12 45 Cs-137

< 9

< 22

< 14

< 11 60 Lab Code PEVE* 2113 PEVE* 2114 PEVE* 2115 PEVE* 2116 Date Collected 09-10-24 09-10-24 09-10-24 09-10-24 Req. LLD Sample Type Turnip Greens Collard Greet1s Kale Swiss Chard Be-7 635 +/- 118 313 +/- 126 115 +/- 60 258 +/- 139 K-40 4618 +/- 368 3933 +/- 347 4163 t 160 4544 +/- 374 Co-58

< 12

< 9

"'6

< 8 Co-60

< 16

< 10

< 7

< 15 1-131 C 40

< 26

< 11

< 37 45 Cs-134

< 13

< 13

<6

< 14 45 Cs-137

< 15

< 10

<5

< 16 60 Lab Code PEVE* 2443 PEVE-2444 PEVE* 2445 PEVE* 2446 Date Collected 10-08-24 10-08-24 10-08-24 10*08-24 Req. LLD Sample Type Tumip Greens Collard Greens Kale Swiss Chard Be-7 430 +/- 75

< 101

< 148

< 130 K-40 5023 +/- 187 6291 +/- 291 5280 +/- 467 5118 +/- 404 Co-58

<: 7 c 9

< 16

< 13 Co,60

< 7

< 9

< 12

< 10 1-131

< 13

< 19

< 30

< 19 45 Cs-134

< 6

< 10

< 16

< 13 45 Cs-137

< 7

< 10

< 14

< 21 60 7-4

Annual Radiological Environmental Operating Report YEAR: 2024 Page 79 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 7. Food Products. analyses for gamma emitting isotopes.

Col ection: Monthly Units; pCilkgwet Location: p.70 Lab Code PEVE-1575 PEVE-1576 PEVE* 1577 PEVE-1578 Date Collected 07,09-24 07-09-24 07-09-24 07-09-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7 261 t 95

< 100

< 93 C 193 K-40 5098 :t 273 4484 t 293 4743 t 313 5530 t 506 Co-58 C 8

< 9

< 5 C B Co-60

< 12

< 10

< 8

< 18 1-131

< 18

< 19

< 15 C 22 45 Cs-134 C 8

< 9

< 9

< 15 45 Cs-137

< 11

< 11

< 10

< 13 60 Lab Code PEVE* 1921 PEVE* 1922 PEVE* 1923 PEVE* 1924 Date Collected 08-13-24 08-13-24 08-13-24 08-13-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale sv,;ss Cllard Be-7 518 t 119

< 233 C 162 388 t 158 K-40 6162 :!: 329 5441 :!: 506 4360 t 513 5087 :!: 581 Co-58

< 9

< 18

< 9

< 21 Co-60

< 9 C 15

< 21

< 16 1-131

< 14

< 36

< 27

< 19 45 Cs-134

< 10

< 21

< 18

< 20 45 Cs-137

< 7

< 21 C 17 C 18 60 Lab Code PEVE* 2117 PEVE* 2118 PEVE* 2119 PEVE* 2120 Date Co lected 09-10-24 09-10-24 09-10-24 09-10-24 Req. LLD Sample Type Turnip GreellS Collard Greens Kale sv,;ss Chard Be-7 292 +/- 102 333 +/- 143 214 t 66 375 :t 174 K-40 4513 :!: 235 4128 :t 365 4553 +/- 153 5133 :!: 666 Co-58 C 12 C 15

< 4

< 29 Co-60

< 11

< 13

< 8

< 17 1-131 C 21 C 22 C 16 C 38 45 Cs-134

< 10

< 12

< 6

< 24 45 Cs-137

< 9

< 13

< 7 C 22 Lab Code PEVE* 2447 PEVE* 2448 PEVE* 2449 PEVE* 2450 Date Collected 10-08-24 10-08-24 10-08-24 10-08-24 Req. LLD Sample Type Turnip Greens Collard Greens Kale Swiss Chard Be-7 290 +/- 92 279 t 115 201 +/- 73 C 191 K-40 7135 :!: 230 5660 t 364 6846 :!: 237 5390 t 630 Co-58

< 7

< 9

< 8

< 24 Co-60 C 8 C 7 C 9 C 17 1-131

< 17 C 20

< 17

< 28 45 Cs-134 C 8 C 12

< 9

< 25 45 Cs-137 C 10 C 15

< 9 C 15 60 7-5

Annual Radiological Environmental Operating Report YEAR: 2024 Page 80 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNPP Table 9. FJSh. analyses for gamma emitbng isotopes.

Collection: Semiannually Units: pCVkgwet Location P*25 Lab Code PEF* 1483 PEF* 1484 PEF* 14a5 Date Collecled 06-24*24 06*24*24 06-24-24 Req. LlC Sample Typo WaUeye While Perctl Yellow Pcrctl K-40 1420.t 165 2097 :t 210 1872 t 187 Mn*S4

<5

<26

< 22 94 Fe-59

< 22

< 62

< 49 195 Co-58

<9

<23

< 27 97 Co-60

< 11

<2e

<26 97 Zn-65

< 16

< 48

<49 195 Cs-134

<9

-c 21

<22 97 Cs-137

< 13

<22

<23 112 LoeabOn P-25 Lab Code PEF-2454 PEF-2455 Date Collectoo 0~20-24 10-03*24 Req.L:LC Sample Type Wa~eye Yellow Petch 1(-40 1105 t 129 2611 :t 36,6 Mn-54

<6

<42 94 Fe,59

< 25

-c 79 195 Co-58

< 10

< 44 97 Co-60

< 10 "39 97 Zn-65

< 16

< 76 195 Cs-134

.. 7

< 3?

97 Cs. 13?

<9

<44 112 9-1

Annual Radiological Environmental Operating Report YEAR: 2024 Page 81 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant PNi'P Table 9 Fish, analy-ses for g.amma em,lling isotopes CollectJon. Semiarvu1aUy lints: pC1/kg wet l.oca11on P-32 lab Code PEF-1486 PEF-2458 PEF-2457 Cate Colleclied 0&-2<1-24 09-20-24 10-03-24 Req u.c Sample Type W.r,lleye wanB)'e Yellow Perch K--40 1675 :t 343 1246 % 107 1400 ::t. 239 Mn-54

<17

<6

<13 94 Fe-59

< 30

< 11

<22 196 Co-l)8

< 21

<4

< 12 97 Co-60

<19

<7

<15 97 Zn--65

<41

< 11

<27 196 c~-13,4

< 18

<6

< 12 97 Cs-137

< 16

< 7

<15 112 9-2

Annual Radiological Environmental Operating Report YEAR: 2024 Page 82 of 82 L-25-065 Company: Vistra I Plant: Perry Nuclear Power Plant Table 11. Sediments. analyses for gamma emittin;g isotopes.

Collection: Semiannually Location Lat>Code Dale Collected K---40 Co-58 Co-60 Cs-134 Cs-137 l oca1ion Lat> Code Date Collecied K-40 Co-58 Co-BO Cs-1 34 Cs-1 37 PEBS-1341 05-2 1-24 6(1'45 +/- 235

< 6.1

< 5.8

< 7.0

< 4.7 PEBS-1342 05-21-24 6658 +/- 209

< 6.1

< 5.3

< 6 5

< 4.4 1M P-64 P-66 PEBS-2452 10-08-24 8284 +/- 154

< 8.3

< 2.6

< 4.1

< 4.6 PEBS-2453 10-08-24 6546 i 119

< 6.1

< 3.2

< 3.7

< 4.0 PNPP Units: pCiJkg dry Req. LLD 50 40 112 135 Req. LLD 50 40 112 135