Text

2022 Annual Radiological Environmental Operating Report
	ML23118A332
Person / Time
Site:	Limerick
Issue date:	04/28/2023
From:	Gillin M; Constellation Energy Generation
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	LG-23-033
	Download: ML23118A332 (1)
	v • d • e

Constellation TS 6.9.1.7 LG-23-033 April 28, 2023 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Units 1 and 2 Renewed Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353

Subject:

2022 Annual Radiological Environmental Operating Report In accordance with the requirements of Section 6.9.1.7 of Limerick Generating Station (LGS)

Units 1 and 2 Technical Specifications (TS), and Section 6.1 of the LGS Units 1 and 2 Offsite Dose Calculation Manual (ODCM), this letter submits the 2022 Annual Radiological Environmental Operating Report. This report provides the 2022 results for the Radiological Environmental Monitoring Program (REMP), as called for in the ODCM.

In assessing the data collected for the REMP, it has been concluded that the operation of LGS, Units 1 and 2 had no adverse impact on the environment. No plant-produced fission or activation products were found in any pathway modeled by the REMP. The results of the groundwater protection program are also included in this report.

There are no commitments contained in this letter.

If you have any questions or require additional information, please contact Amanda Sborz at 610-718-2700.

Respectfully, Michael F. Gillin Site Vice President - Limerick Generating Station Constellation Energy Generation, LLC

Attachment:

2022 Annual Radiological Environmental Operating Report cc: Administrator, Region I, USNRC (w/attachment)

LGS USNRC Senior Resident Inspector (w/attachment)

M. Henrion, Inspector Region I, USNRC (w/attachment)

LGS Senior Project Manager-NRR, USNRC (w/attachment)

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR THE LIMERICK GENERATING STATION UNITS 1 AND 2 January 1 - December 31, 2022 Prepared by M. Aument A. M. Barnett CONSTELLATION GENERATION CONSTELLATION NUCLEAR GENERATION APRIL 2023

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE OF CONTENTS LIST OF FIGURES ...................................................................................................................... ii

LIST OF TABLES ....................................................................................................................... iii

I.

SUMMARY

.................................................................................................................................4

II. LIMERICK GENERATING STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ..........................................................................................13

II.A. INTRODUCTION ....................................................................................................................................... 13

II.B. PROGRAM .................................................................................................................................................. 14

II.B.1 Objectives ............................................................................................................................................. 14

II.B.2 Sample Collection ................................................................................................................................ 14

II.B.3 Data Interpretation .............................................................................................................................. 16

II.B.4 Program Exceptions............................................................................................................................. 17

II.C. RESULTS AND DISCUSSIONS ................................................................................................................. 19

II.C.1 Aquatic Environment ........................................................................................................................... 19

II.C.1.a Surface and Drinking Water ............................................................................................................ 20

II.C.1.b Aquatic Organisms ............................................................................................................................ 20

II.C.1.c Shoreline Sediment ............................................................................................................................ 20

II.C.2 Atmospheric Environment .................................................................................................................. 21

II.C.2.a Air Particulate Filters ....................................................................................................................... 21

II.C.2.b Air Iodine .......................................................................................................................................... 21

II.C.3 Terrestrial Environment .................................................................................................................... 22

II.C.3.a Vegetation .......................................................................................................................................... 22

II.C.3.b Milk .................................................................................................................................................... 22

II.C.4 Direct Radiation ................................................................................................................................... 23

II.D. CONCLUSION ............................................................................................................................................. 24

V. REFERENCES ........................................................................................................................28

APPENDIX A Sample Locations for the REMP .....................................................................30

APPENDIX B Analysis Results for the REMP ........................................................................42

APPENDIX C Quality Assurance Program ..............................................................................62

APPENDIX D Land Use Survey................................................................................................90

APPENDIX E Annual RGPP Report for Limerick Generating Station ................................93

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 LIST OF FIGURES Figure Title Page A-1 Limerick Generating Station Sample Locations ................................................................34

A-2 Limerick Generating Station Sample Locations ................................................................35

A-3 Limerick Generating Station Sample Locations ................................................................36

A-4 Gross Beta in Public Water for the Last Ten Years ...........................................................37

A-5 Gross Beta in Air for the Last Ten Years ..........................................................................38

A-6 Annual Trending of Air Activity (Gross Beta) ..................................................................39

A-7 2022 Monthly Gross Beta Concentrations in Drinking Water, (16C2) ............................40

A-8 2022 Weekly Gross Beta Concentrations in Air Particulate Samples from Co-Located Air samplers .......................................................................................................................41

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 LIST OF TABLES Table Title Page 1 Synopsis of 2022. Limerick Generating Station Radiological Environmental Monitoring Program ..............................................................................................................................25

2 Annual Summary of Radioactivity in the Environs of the Limerick Generating Station ..27

A-1 Locations of Environmental Sampling Stations for the Limerick Generating Station ......32

A-2 Locations of Environmental Sampling Stations for the Limerick Generating Station ......33

B-1 Concentration of Tritium, Gamma Emitters and Gross Beta in Surface and Drinking Water ..................................................................................................................................44

B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish .........................................46

B-3 Concentration of Gamma Emitters in Sediment ................................................................47

B-4 Concentration of Iodine-131 in Filtered Air ......................................................................48

B-5 Concentration of Beta Emitters in Air Particulates - Onsite Samples...............................50

B-6 Concentration of Gamma Emitters in Air Particulates ......................................................53

B-7 Concentration of Gamma Emitters in Vegetation Samples ...............................................54

B-8 Concentration of Gamma Emitters (including I-131) in Milk ...........................................55

B-9 Typical MDA Ranges for Gamma Spectrometry ...............................................................57

B-10 Typical LLDs for Gamma Spectrometry ............................................................................58

B-11 Quarterly DLR Results for Limerick Generating Station, 2022 .........................................59

C-1 Results of Participation in Cross Check Programs ............................................................66

C-2 Results of Quality Assurance Program ..............................................................................72

C-2a Results of Quality Assurance Program Co-Located Air Samplers ....................................84

C-2b Results of Quality Assurance Program Co-Located Air Samplers ....................................87

C-3 Limerick Generating Station ODCM Required LLDs .......................................................89

D-1 Land Use Survey ................................................................................................................90

E-1 Locations of Onsite Radiological Groundwater Protection Program - Limerick Generating Station, 2022 .................................................................................................107

E-2 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022 ..................................................................108

E-3 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022 ..................................................................109

E-4 Hard to Detects in Groundwater .......................................................................................110

E-5 Concentration of Radiostrontium in Groundwater ............................................................111

E-7 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage ......113

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 I.

SUMMARY

The following sections of the summary are meant to help define key concepts, provide clarity, and give context of the monitoring program and results to the readers of this report.

Annual Reports The Nuclear Regulatory Commission (NRC) is the federal agency who has the role to protect public health and safety related to nuclear energy. Nuclear Power Plants have made many commitments to the NRC to ensure the safety of the public. As part of these commitments, they provide two reports annually to specifically address how the stations operation impacts the environment of the local communities. The NRC then reviews these reports and makes them available to the public. The names of the reports are the Annual Radioactive Effluent Release Report (ARERR) and the Annual Radiological Environmental Operating Report (AREOR).

The ARERR reports the results of the analyses of samples taken from the effluent release paths at the station. An effluent is a liquid or gaseous waste, containing plant-related radioactive material emitted at the boundary of the facility.

The AREOR reports the results of the analyses of samples obtained in the environment surrounding the station. Environmental samples include air, water, vegetation, and other sample types that are identified as potential pathways radioactivity can reach humans.

Graphic 1. Examples of Gaseous and Liquid Effluent Pathways Dri nki ng S urface Water or Groundwatef" 4

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Graphic 1 demonstrates some potential exposure pathways from Limerick Generating Station.

The ARERR and AREOR together ensure Nuclear Power Plants are operating in a manner that is within established regulatory commitments meant to adequately protect the public.

Understanding Radiation Generally radiation is defined as emitted energy in the form of waves or particles. Radiation has enough energy to displace electrons from an atom it is termed ionizing, otherwise it is non-ionizing. Non-Ionizing radiation includes light, heat given off from a stove, radiowaves and microwaves. Ionizing radiation occurs in atoms, particles too small for the eye to see. So, what are atoms and how does radiation come from them?

Graphic 2. Types of Radiation, from NASA Hubblesite The El&ctromagnetic Spectrum Wavelen!,J1h I n mete-rs

.-3 -:s -Ii, .-'I ffl *t o to 11m, to 110 h10 _ 1 ili0 4 10 Albouf th* s lz* ,of:

B uildin,g1;1 Grai n~ Prolozoan s Baomria Mol ecule,s, .Atoms of eugiar An atom is the smallest part of an element that maintains the characteristics of that element.

Atoms are made up of three parts: protons, neutrons, and electrons.

Graphic 3. Structure of an Atom The number of protons in an atom determines the element. For example, a hydrogen atom will always have one proton while an oxygen atom will always have eight protons. The protons are clustered with the neutrons forming the nucleus at the center of the atom. Orbiting around the nucleus are the relatively small electrons. Isotopes are atoms that have the same number of protons but different numbers of neutrons. Different isotopes of an element will all have the same chemical properties and many isotopes are radioactive while other isotopes are not 5

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 radioactive. A radioactive isotope can emit radiation because it contains excess energy in its nucleus. Radioactive atoms and isotopes are also referred to as radionuclides and radioisotopes.

There are two basic ways that radionuclides are produced at a nuclear power plant. The first is fission, which creates radionuclides that are called fission products. Fission occurs when a very large atom, such as uranium-235 (U-235) or plutonium- 239 (Pu-239), absorbs a neutron into its nucleus making the atom unstable. The unstable atom can then split into smaller atoms. When fission occurs, there is a large amount of energy released in the form of heat. A nuclear power plant uses the heat generated to boil water that spins turbines to produce electricity.

The second way a radionuclide is produced at a nuclear power plant is through a process called activation and the radionuclides produced in this method are termed activation products. Pure water that passes over the fissioning atoms is used to cool the reactor and also produce steam to turn the turbines. Although this water is considered to be very pure, there are always some contaminants within the water from material used in the plants construction and operation.

These contaminants are exposed to the fission process and may become activation products. The atoms in the water itself can also become activated and create radionuclides.

Over time, radioactive atoms will reach a stable state and no longer be radioactive. To do this they must release their excess energy. This release of excess energy is called radioactive decay.

The time it takes for a radionuclide to become stable is measured in units called half-lives. A half-life is the amount of time it takes for half of the original radioactivity to decay. Each radionuclide has a specific half-life. Some half-lives can be very long and measured in years while others may be very short and measured in seconds.

Graphic 4. Radioactive Decay Half-Life Half-life The amount of time it takes for half of the original radioactivity to decay 600 Activity lhatf-llfe 2hal f-llves 3h.il f-llves 4ha l f-llves In the annual reports you will see both man made and naturally occurring radionuclides listed, for example potassium-40 (K-40, natural) and cobalt-60 (Co-60, man-made). We are mostly concerned about man-made radionuclides because they can be produced as by-products when generating electricity at a nuclear power plant. It is important to note that there are also other ways man-made radionuclides are produced, such as detonating nuclear weapons. Weapons testing has deposited some of the same man-made radionuclides into the environment as those generated by nuclear power, and some are still present today because of long half-lives.

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Measuring Radiation There are four different but interrelated units for measuring radioactivity, exposure, absorbed dose, and dose equivalent. Together, they are used to scientifically report the amount of radiation and its effects on humans.

x Radioactivity refers to the amount of ionizing radiation released by a material. The units of measure for radioactivity used within the AREOR and ARERR are the Curie (Ci).

Small fractions of the Ci often have a prefix, such as the microCurie (Ci), which means 1/1,000,000 of a Curie.

x Exposure describes the amount of radiation traveling through the air. The units of measure for exposure used within the AREOR and ARERR are the Roentgen (R).

Traditionally direct radiation monitors placed around the site are measured in milliRoentgen (mR), 1/1,000 of one R.

x Absorbed dose describes the amount of radiation absorbed by an object or person. The units of measure for absorbed dose used within the AREOR and ARERR are the rad.

Noble gas air doses are reported by the site are measured in millirad (mrad), 1/1,000 of one rad.

x Dose equivalent (or effective dose) combines the amount of radiation absorbed and the health effects of that type of radiation. The units used within the AREOR and ARERR are the Roentgen equivalent man (rem). Regulations require doses to the whole body, specific organ, and direct radiation to be reported in millirem (mrem), 1/1,000 of one rem.

Sources of Radiation People are exposed to radiation every day of their lives and have been since the dawn of mankind. Some of this radiation is naturally occurring while some is man- made. There are many factors that will determine the amount of radiation individuals will be exposed to such as where they live, medical treatments, etc. The average person in the United States is exposed to approximately 620 mrem each year. 310 mrem comes from natural sources and 310 from man-made sources. The Graphic 5 shows what the typical sources of radiation are for an individual over a calendar year:

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Graphic 5. Sources of Radiation Exposure in the U.S., from NCRP Report No. 160 Sources of Radiation Exposure in the U.S.

Industrial and Terrestrial (Soil) - 3% Occupational Internal - 5% <'.0.1%

Nuclear Medicine 12%

D Natural Sources - 50%

~310 millirem (0.3 1 rem)

(D Manmade Sources - 50%

~310 millirem (0.3 1 rem)

Sourc,e: NCRP Report No, 160 (2009t Full report i.savailable on the NCRP website atwww.NCRPonline.org The radiation from a nuclear power plant is included in the chart as part of the Industrial and Occupational fraction, <0.1%. The largest natural source of radiation is from radon, because radon gas travels in the air we breathe. Perhaps you know someone who had a CT scan at a hospital to check his or her bones, brain, or heart. CT scans are included in the chart as Medical Procedures, which make up the next largest fraction. Graphic 6 on the following page shows some of the common doses humans receive from radiation every year.

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Graphic 6 .Relative Doses from Radiation Sources, from EPA Radiation Doses and Sources RELATIVE DOSES FROM RADIATION SOURCES All doses from the Natfonal Councll on Radiation Protection & Measurement.s, Report No. 160 (unless: otherwise denoted}

Whole body CT 1,000 mllHrem

( single procedure)

UpSM:r G. .trolntMUBIII x-r*y exam with ftuoroscopy 600 mllllrem (single procedure)

Radon In average: U.S. home 228 mllllrem (annual) 200H-d mllllrem CT . , '

(single procedure}

Co*mlc radia tion llvlng In Denver

{high e l evation )

approxlmately 80 mllllrem (annual)

Mammogram 42 mllUrem ~

(single procedure) Co1mlc radiati on ltvlna at ..,.

From l CRP 2007 level (low e ..vatlon) approximately 30 mllllrem (annual)

Rad latIon In the body 29 mllltrem (annual)

TerNStrlal radioactivity 21 mllllrem

( annual)

Ch*tx-ray 10 millirem

( single procedure)

Uvl ng n. .,

nudNr power station

< 1 mllllrem (annual) mrem

9

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Radiation Risk Current science suggests there is some risk from any exposure to radiation. However, it is very hard to tell whether cancers or deaths can be attributed to very low doses of radiation or by something else. U.S. radiation protection standards are based on the premise that any radiation exposure carries some risk.

The following graph is an example of one study that tries to relate risk from many different factors. This graph represents risk as Days of Lost Life Expectancy. All the categories are averaged over the entire population except Male Smokers, Female Smokers, and individuals that are overweight. Those risks are only for people that fall into those categories. The category for Nuclear Power is a government estimate based on all radioactivity releases from nuclear power, including accidents and wastes.

Graphic 7. Days of Lost Life Expectancy, Adapted from the Journal of American Physicians and Surgeons Volume 8 Number 2 Summer 2003 Days of Lost Life Expectancy Smoking - Men Heart Disease Smoking - Women Cancer Every 10 lbs overweight Stroke Motor Vehicle Accident Air Pollution I Radon Chemical Residue in Foods Drowning Hurricanes and Tornadoes Lightning Nuclear Power 0 500 1000 1500 2000 2500 3000 Days of Lost Life Expectancy Hurricanes and Tornadoes Lightning Nuclear Power I 0 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 In 2022, the Limerick Generating Station released to the environment through the radioactive effluent liquid and gaseous pathways approximately 87 curies of noble gas, fission and activation products and approximately 17 curies of tritium. The dose from both liquid and 10

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 gaseous effluents was conservatively calculated for the Maximum Exposed Member of the Public. The results of those calculations and their comparison to the allowable limits were as follows:

Summary of Gaseous and Liquid Effluent Doses to Members of the Public at the Highest Dose Receptors Maximum % of Applicable Estimated Age Individual Applicable Limit Unit Noble Gas Dose Dose Group Limit Gamma Air RR Tracks W 8.008E-03 All 4.00E-02 20 mRad Dose

RR Tracks W Beta Air Dose 4.710E-03 All 1.18E-02 40 mRad RR Tracks W Total Body 7.642E-03 All 7.64E-02 10 mrem

RR Tracks W Skin 1.273E-02 All 4.24E-02 30 mrem

Iodine, Particulate,

C-14 & Tritium Vegetation Pathway Bone 4.946E-01 Child 1.65E+00 30 mrem

Liquid

LGS OUTFALL Total Body 5.327E-03 Adult 8.88E-02 6 mrem

LGS OUTFALL Liver 7.065E-03 Teen 3.53E-02 20 mrem

The calculated doses, from the radiological effluents released from Limerick, were a very small percentage of the allowable limits.

This report on the Radiological Environmental Monitoring Program conducted for the Limerick Generating Station (LGS) by Constellation covers the period of January 1, 2022 through December 31, 2022. During that time period, 1,483 analyses were performed on 1,352 samples.

Surface and drinking water samples were analyzed for concentrations of tritium (H-3), low level iodine-131 (I-131) and gamma-emitting nuclides. Drinking water samples were also analyzed for concentrations of total gross beta. Total gross beta activities detected were consistent with those detected in previous years. No other fission or activation products were detected.

Fish (predator and bottom feeder) samples were analyzed for concentrations of gamma-emitting nuclides. Concentrations of naturally occurring potassium-40 (K-40) were consistent with those detected in previous years. No fission or activation products were detected in fish.

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Sediment samples were analyzed for concentrations of gamma-emitting nuclides. No station-produced fission or activation products were found in sediment. For results, discussion, and dose to member of the public calculation see Section II.B.6.

Air particulate samples were analyzed for concentrations of gross beta and gamma- emitting nuclides. Gross beta and cosmogenic, naturally occurring beryllium-7 (Be-7) were detected at levels consistent with those detected in previous years. No fission or activation products were detected. High-sensitivity I-131 analyses were performed on weekly air samples. All results were less than the minimum detectable concentration.

The air monitoring systems employed in the nuclear industry have proven to be capable of detecting very low levels of activity in the atmosphere, as activity from both the Chernobyl and Fukushima events was detected at many of the worlds nuclear power plants, including Limerick Generating Station.

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

Concentrations of naturally occurring K-40 were consistent with those detected in previous years. No fission or activation products were found.

Broadleaf vegetation samples were analyzed for gamma-emitting nuclides. Only naturally occurring activity was detected. K-40 was detected in all samples. Be-7 was found in 25 of 36 samples. Radium-226 (Ra-226) was found in 6 of 36 samples. Thorium-232 (Th-232) was found in 15 of 36 samples. No activity due to plant operations were detected.

Review of the gamma spectroscopy results from the surface water samples located at the Limerick intake (24S1) and downstream of the 10 CFR 20.2002 permitted storage area showed no evidence of offsite radionuclide transport from the 2002 permitted storage area.

Environmental ambient gamma radiation measurements were performed quarterly using Dosimeters of Legal Record (DLR). Levels detected were consistent with those observed in previous years and no facility-related dose was detected. A review of the dosimetry data for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) indicates no direct dose was received.

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

In assessing the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of LGS had no adverse radiological impact on the environment.

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II. LIMERICK GENERATING STATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM II.A. INTRODUCTION The Limerick Generating Station (LGS), consisting of two 3,515 MW boiling water reactors owned and operated by Constellation Corporation, is located adjacent to the Schuylkill River in Montgomery County, Pennsylvania. Unit No. 1 went critical on December 22, 1984. Unit No. 2 went critical on August 11, 1989. The site is located in Piedmont countryside, transversed by numerous valleys containing small tributaries that feed into the Schuylkill River. On the eastern riverbank, elevation rises from approximately 110 to 300 feet mean sea level (MSL). On the western riverbank elevation rises to approximately 50 feet MSL to the western site boundary.

A Radiological Environmental Monitoring Program (REMP) for LGS was initiated in 1971.

Review of the 1971 through 1977 REMP data resulted in the modification of the program to comply with changes in the Environmental Report Operating License Stage (EROL) and the Branch Technical Position Paper (Rev. 1, 1979). The preoperational period for most media covers the periods January 1, 1982 through December 21, 1984 and was summarized in a separate report. This report covers those analyses performed by Constellation Generation Solutions (CGS), Mirion Technologies, and Teledyne Brown Engineering (TBE)/GEL Laboratories (GEL) on samples collected during the period January 1, 2022 through December 31, 2022.

On July 6, 1996, a 10 CFR 20.2002 permit was issued to Limerick for storage of slightly contaminated soils, sediments and sludges obtained from the holding pond, cooling tower and spray pond systems. These materials will decay to background while in storage. Final disposition will be determined at Station decommissioning.

On July 21, 2008, an ISFSI pad was put into service. The ISFSI is dry cask storage, where spent nuclear fuel is stored.

13

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II.B. PROGRAM II.B.1 Objectives A. Objective of the REMP The objectives of the REMP are to:

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

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

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

1. Identifying significant exposure pathways

2. Establishing baseline radiological data of media within those pathways

3. Continuously monitoring those media before and during station operation to assess station radiological effects (if any) on man and the environment II.B.2 Sample Collection and Analysis Samples for the LGS REMP were collected for Constellation Nuclear by contractors to, or personnel of, CGS according to applicable procedures (Ref. 6,12,13). Control locations are sample locations that are not expected to be impacted by plant operations and are used to determine a baseline in the environment for each type of sample. This section describes the general collection methods used to obtain environmental samples for the LGS REMP in 2022.

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

Analyses are performed in accordance with applicable procedures (Ref. 7,10,11,13) and results are provided in Appendix B for primary REMP Analysis. Analysis results for quality assurance are provided in Appendix C. Analysis results for LGS RGPP are provided in Appendix E.

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

II.B.2.a Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, fish, and sediment. Two-gallon water samples were collected 14

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 monthly from composite samplers located at two surface water locations (13B1 and 24S1) and four drinking water locations (15F4, 15F7, 16C2, and 28F3). Control locations were 24S1, and 28F3. All samples were collected in new unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising of the flesh of two groups, bottom feeder (Carp / Northern Hogsucker / Norther Sucker / White Sucker) and predator (American Eel

/ Black Crappie / Bluegill / Brown Trout / Channel Catfish / Flathead Catfish / Green Sunfish /

Smallmouth Bass / Yellow Perch), were collected semiannually at two locations, 16C5 and 29C1 (control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, 16B2, 16C4, and 33A2 (control).

II.B.2.b Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, and milk. Airborne iodine and particulate samples were collected and analyzed weekly at seven locations (6C1, 10S3, 11S1, 13S4, 14S1, 15D1, and 22G1). The control location was 22G1. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The filters were replaced weekly and sent to the laboratory for analysis.

II.B.2.c Terrestrial Environment Milk samples were collected biweekly at three locations (18E1, 19B1, 23F1, and 25C1) from April through November due to a farmer injury at 25C1 that made collection from that site impossible since his cows were given to another farm while he recovered, and monthly from all locations December through March since the farmer injury did not occur until late April.

Location 23F1 was the control. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.

Broadleaf vegetation was collected monthly, during the growing season, at three locations (11S3, 13S3, and 31G1). The control location was 31G1. Eight different kinds of vegetation samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

II.B.2.d Ambient Gamma Radiation Direct Radiation measurements were made using thermoluminescent dosimeters. The DLR locations were placed on and around the LGS site as follows:

A site boundary ring consisting of 16 locations (36S2, 3S1, 5S1, 7S1, 10S3, 11S1, 13S2, 14S1, 18S2, 21S2, 23S2, 25S2, 26S3, 29S1, 31S1, and 34S2) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from LGS releases.

An intermediate distance ring consisting of 16 locations (36D1, 2E1, 4E1, 7E1, 10E1, 10F3, 13E1, 16F1, 19D1, 20F1, 24D1, 25D1, 28D2, 29E1, 31D2, and 34E1) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.

15

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 The balance of eight locations (5H1, 6C1, 9C1, 13C1, 15D1, 17B1, 20D1, and 31D1) representing control and special interest areas such as population centers, schools, etc.

The specific dosimetry locations were determined by the following criteria:

1. The presence of relatively dense population,

2. Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2-degree sectors around the site, where estimated annual dose from LGS, if any, would be most significant,

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

4. And near the closest dwelling to the vents in the prevailing downwind direction.

Two dosimeters were placed at each location in a mesh basket tube located approximately three feet above ground level. The dosimeters were exchanged quarterly and sent to Mirion Technologies for analysis.

II.B.2.e 10 CFR 20.2002 Permit Storage Area In 1996, the Limerick Generating Station received NRC approval to store slightly contaminated soils, sludges, and sediments on site per the requirements of 10 CFR 20.2002. These materials will be stored until end of the site's renewed operating license. At that time the material will be evaluated along with the site for decommissioning. The area is approximately 1.5 acres in size and was evaluated to hold a maximum of 1.12E+06 cubic feet with no more than 7E+04 cubic feet added to the area in any single year. After each material placement on the storage area, the area is graded and seeded to prevent erosion. Since all groundwater movement is to the river, the use of the REMP surface water sampling program is used as a check on potential groundwater movement from the pad.

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

The results from the dosimeter location 36S2 was used to determine the direct radiation exposure to the nearest residence from the ISFSI pad.

II.B.3 Data Interpretation The radiological and direct radiation data collected prior to LGS becoming operational was used as a baseline with which these operational data were compared. For the purpose of this report, LGS was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

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

16

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353

2. Reporting of Results Gamma spectroscopy analyzes samples for the full range of nuclides. All nuclides that identified positive results for non-natural gamma emitters are reported. Each type of sample also looks for specific nuclides which must meet LLD requirements as described above. The required nuclides and their LLDs for each type of sample are provided in Table C-3.

Means and standard deviations of positive results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.

3. Minimum Detectable Activity Many results in environmental monitoring occur at or below the minimum detectable activity (MDA). In this report, all results at or below the relevant MDA are reported as being

"<MDA indicating less than the MDA value of all non-natural gamma emitters.

II.B.4 Program Exceptions For 2022, the LGS REMP had a sample recovery rate of greater than 99%. Program exceptions are listed below:

1. On 4/25/22, biweekly milk samples were unavailable at the 25C1 Kolb Farm location due to a serious farmer injury. The cows from that farm were given to another farm while the farmer recovered. A new milk location was found and beginning in 2023, a new location will replace 25C1. ODCM revision 35 is in progress and will include this location change (IR 04495527).

2. An NRC enhancement to the REMP program was recommended during the 2022 NRC REMP inspection. The inspector recommended that the program should try to comply with a recognized standard such as ASTM D5111.12. The main part of the standard to try and meet would be, "No object or structure will project onto the sampling device with an angle greater than 30 degrees from the horizontal plane measured from the sample intake. The standard states that this can also be accomplished by ensuring that the distance of any object higher than sample intake be twice the height of the object." Effort will be made to determine who owns the land around each affected air sampler to determine if tree trimming is possible. (IR 04537826).

3. Tritium was detected in the MW-LR-9 groundwater sample collected on 10/25/22.

Vendor analysis detected 5710 pCi/L. The tritium alert level is 2000 pCi/L. As this is part of on-going monitoring and is not indicative of a new release, no executive notification was required. The sample was reanalyzed and the result was confirmed.

More frequent samples continue for this groundwater sample location. (IR 04540232).

17

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Each program exception was reviewed to understand the causes of the program exception.

Occasional equipment breakdowns were unavoidable. The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

II.B.5 Program Changes Revision 34 of the ODCM was approved and implemented on 4/1/22. The major change was to revise LGS Technical Specifications definitions for CHANNEL CAILBRATION, CHANNEL FUNCTIONAL TEST, AND LOGIC SYSTEM FUNCTIONAL TEST.

Dose to Members of the Public at or Beyond Site Boundary:

Per the ODCM Control 6.2, the Annual Radioactive Effluent Release Report shall include an assessment of the radiation doses to the hypothetically highest exposed MEMBER OF THE PUBLIC from reactor releases and other nearby uranium fuel cycle sources. The ODCM does not require population doses to be calculated. For purposes of this calculation the following assumptions were made:

x Long term annual average meteorology X/Q and D/Q and x Actual gaseous effluent releases were used.

x Gamma air dose, Beta air dose, Total Body and Skin doses were attributed to noble gas releases.

x Critical organ and age group dose attributed to iodine, particulate, Carbon-14 and tritium releases.

x 100 percent occupancy factor was assumed.

x Dosimetry measurements obtained from the REMP for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) was used to determine direct radiation exposure.

x The highest doses from the critical organ and critical age group for each release pathway was summed and added to the net dosimetry measurement from nearest residence to the ISFSI for 40 CFR 190 compliance.

40 CFR 190 Compliance:

The maximum calculated dose to a real individual would not exceed 0.12 mRem (total body),

0.52 mRem (organ), or 0.10 mRem (thyroid).

All doses calculated were below all ODCM and 40 CFR Part 190 limits to a real individual.

18

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 40 CFR 190 Compliance Gaseous Effluents Particulate, Net % of Liquid Noble Iodine, C- Direct Total Applicable Limit Unit Effluents 14 Radiation Limit Gas & Tritium

Total Body Dose 1.15E-02 9.91E-02 5.33E-03 0.00E+00 1.16E-01 4.64E-01 25 mrem Organ Dose 1.91E-02 4.95E-01 7.06E-03 0.00E+00 5.21E-01 2.08E+00 25 mrem Thyroid Dose NA 1.00E-01 2.66E-03 0.00E+00 1.03E-01 1.37E-01 75 mrem II.C. RESULTS AND DISCUSSIONS All the environmental samples collected during the year were analyzed using Constellation Generation Services laboratory procedures CY-ES-205 and CY-ES-206, except Tritium which was analyzed by GEL Laboratories (GL-RAD-A-002 REV# 24), in accordance with analytical method EPA 906.0 Modified, and Dosimetry analysis by Mirion Technologies. The analytical results for this reporting period are presented in Appendix B and are also summarized in Table 2.

For discussion, the analytical results are divided into four categories. The categories are Aquatic Environment, Atmospheric Environment, Terrestrial Environment, and Direct Radiation. These categories are further divided into subcategories according to sample type (e.g. Surface Water/Drinking Water and Aquatic Organisms for Aquatic Environment).

II.C.1 Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, drinking water, fish, and sediment. Two-gallon water samples were collected monthly from composite samplers located at two surface water locations (13B1 and 24S1) and four drinking water locations (15F4, 15F7, 16C2, and 28F3). Control locations were 24S1 and 28F3. All samples were collected in new unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising of the flesh of two groups, bottom feeder (Northern Hogsucker / Quillback / White Sucker) and predator ( Channel Catfish / Red-Breast Sunfish / Smallmouth Bass ), were collected semiannually at two locations, 16C5 and 29C1 (control). Sediment samples composed of recently deposited substrate were collected at three locations semiannually, 16B2, 16C4, and 33A2 (control).

19

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II.C.1.a Surface and Drinking Water Surface and drinking water samples were analyzed for concentrations of tritium (H-3), low level iodine-131 (I-131) and gamma-emitting nuclides. Drinking water samples were also analyzed for concentrations of total gross beta. Total gross beta activities detected were consistent with those detected in previous years. No other fission or activation products were detected.

Gamma and gross beta analysis were performed on all water samples on a monthly basis Composites are made from the weekly samples. Results for all water Gamma and gross beta analyses are listed in Table B-1.

Tritium analysis was performed on all water samples on a quarterly basis. Composites are made from the weekly samples. Tritium data is given in Table B-1.

Review of the gamma spectroscopy results from the surface water samples located at the Limerick intake (24S1) and downstream of the 10 CFR 20.2002 permitted storage area showed no evidence of offsite radionuclide transport from the 2002 permitted storage area.

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

II.C.1.b Aquatic Organisms Fish (predator and bottom feeder) samples were analyzed for concentrations of gamma-emitting nuclides. Concentrations of naturally occurring potassium-40 (K-40) were consistent with those detected in previous years. No fission or activation products were detected in fish.

II.C.1.c Shoreline Sediment Sediment samples were analyzed for concentrations of gamma-emitting nuclides. No station-produced fission or activation products were found in sediment. For results, discussion, and dose to member of the public calculation see Section II.B.6.

20

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II.C.2 Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, and milk. Airborne iodine and particulate samples were collected and analyzed weekly at seven locations (6C1, 10S3, 11S1, 13S4, 14S1, 15D1, and 22G1). The control location was 22G1. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The filters were replaced weekly and sent to the laboratory for analysis.

II.C.2.a Air Particulate Filters Air particulate samples were analyzed for concentrations of gross beta and gamma- emitting nuclides. Gross beta and cosmogenic, naturally occurring beryllium-7(Be-7) were detected at levels consistent with those detected in previous years. No fission or activation products were detected.

Based on weekly comparisons, there was no statistical difference between the Control and Indicator radioactive particulate concentrations. The averages for the control samples were 0.023 pCi/m3, and the averages for the indicators were 0.022 pCi/m3 for the period of January to December, 2022. Maximum weekly concentrations for each station were less than 0.045 pCi/m3.

The particulate filters from each sampling location were saved and a 13 week composite was made. A gamma isotopic analysis was performed for each sampling location and corrected for decay. The results of these analyses are listed in Tables B-6.

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

The air monitoring systems employed in the nuclear industry have proven to be capable of detecting very low levels of activity in the atmosphere, as activity from both the Chernobyl and Fukushima events was detected at many of the worlds nuclear power plants, including Limerick Generating Station.

Radioiodine cartridges are placed at seven locations. These cartridges are changed and analyzed each week. No positive analytical results were found on any sample. A list of values for these cartridges is given in Table B-4.

21

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II.C.3 Terrestrial Environment

II.C.3.a Vegetation Broadleaf vegetation was collected monthly, during the growing season, at three locations (11S3, 13S3, and 31G1). The control location was 31G1. Ten different kinds of vegetation samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Broadleaf vegetation samples were analyzed for gamma-emitting nuclides. Only naturally occurring activity was detected. K-40 was detected in all samples. Be-7 was found in 25 of 36 samples. Radium-226 (Ra-226) was found in 6 of 36 samples. Thorium-232 (Th-232) was found in 15 of 36 samples. No activity due to plant operations were detected.

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

II.C.3.b Milk Milk samples were collected biweekly at three locations (18E1, 19B1, 23F1, and 25C1) from April through November due to a farmer injury at 25C1 that made collection from that site impossible since his cows were given to another farm while he recovered, and monthly from all locations December through March since the farmer injury did not occur until late April. All samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory.

In ODCM revision 35, location 25C1 will be removed as a sample location and replaced with location 22B1. The associated map will also be updated to include this new location. The map shown in Figure A-3 is the old map featuring the old locations. After the ODCM revision is approved, a new map will be generated and included in next year's AREOR.

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

Concentrations of naturally-occurring K-40 were consistent with those detected in previous years. No fission or activation products were found.

Gamma isotopic data is given in Table B-8.

22

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II.C.4 Direct Radiation Environmental ambient gamma radiation measurements were performed quarterly using Dosimeters of Legal Record (DLR). Levels detected were consistent with those observed in previous years and no facility-related dose was detected. A review of the dosimetry data for the nearest residence to the Independent Spent Fuel Storage Installation (ISFSI) indicates no direct dose was received.

Ambient Gamma Radiation Direct Radiation measurements were made using thermoluminescent dosimeters. The DLR locations were placed on and around the LGS site as follows:

A site boundary ring consisting of 16 locations (36S2, 3S1, 5S1, 7S1, 10S3, 11S1, 13S2, 14S1, 18S2, 21S2, 23S2, 25S2, 26S3, 29S1, 31S1, and 34S2) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from LGS releases.

An intermediate distance ring consisting of 16 locations (36D1, 2E1, 4E1, 7E1, 10E1, 10F3, 13E1, 16F1, 19D1, 20F1, 24D1, 25D1, 28D2, 29E1, 31D2, and 34E1) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population.

The balance of eight locations (5H1, 6C1, 9C1, 13C1, 15D1, 17B1, 20D1, and 31D1) representing control and special interest areas such as population centers, schools, etc.

The specific dosimetry locations were determined by the following criteria:

1. The presence of relatively dense population,

2. Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2-degree sectors around the site, where estimated annual dose from LGS, if any, would be most significant.

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

4. And near the closest dwelling to the vents in the prevailing downwind direction.

Two dosimeters were placed at each location in a mesh basket tube located approximately three feet above ground level. The dosimeters were exchanged quarterly and sent to Mirion Technologies for analysis.

10 CFR 20.2002 Permit Storage Area In 1996, the Limerick Generating Station received NRC approval to store slightly contaminated soils, sludges, and sediments on site per the requirements of 10 CFR 20.2002. These materials will be stored until end of the site's renewed operating license. At that time the material will be 23

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 evaluated along with the site for decommissioning. The area is approximately 1.5 acres in size and was evaluated to hold a maximum of 1.12E+06 cubic feet with no more than 7E+04 cubic feet added to the area in any single year. After each material placement on the storage area, the area is graded and seeded to prevent erosion. Since all groundwater movement is to the river, the use of the REMP surface water sampling program is used as a check on potential groundwater movement from the pad.

Independent Spent Fuel Storage Installation (ISFSI)

The results from the dosimeter location 36S2 was used to determine the direct radiation exposure to the nearest residence from the ISFSI pad.

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

In 2022, the Limerick Generating Station released to the environment through the radioactive effluent liquid and gaseous pathways approximately 87 curies of noble gas, fission and activation products and approximately 17 curies of tritium. The dose from both liquid and gaseous effluents was conservatively calculated for the Maximum Exposed Member of the Public. The results of those calculations and their comparison to LLD's in Table C-3 were as follows:

24

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table 1 Synopsis of 2022 Limerick Generating Station Radiological Environmental Monitoring Program Sample Type Sampling Number of Number Analysis Analysis Number Frequency1 Locations Collected Frequency1 Analyzed Aquatic Environment Surface Water, MC 6 72 Gamma MC 72 Drinking Water Gross Beta MC 48 Tritium QC 24 Fish2 SA 2 8 Gamma SA 8 Shoreline Sediment SA 3 3 Gamma SA 3 Atmospheric Environment Air Iodine3 W 7 364 I-131 W 364 Air Particulates4 W 7 364 Gross Beta W 364 Gamma QC 28 25

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table 1 Synopsis of 2022 Limerick Generating Station Radiological Environmental Monitoring Program Sample Type Sampling Number of Number Analysis Analysis Number Frequency1 Locations Collected Frequency1 Analyzed Terrestrial Environment Milk5 M/BW 4 69 Gamma W 69 Vegetation6 M 3 36 Gamma M 36 Dosimetry Q 40 320 Direct Radiation Q 320 1

W=Weekly, BW=BiWeekly (15 days), M=Monthly (31 days), Q=Quarterly (92 days), SA=Semiannual, A=Annual, C=Composite

2 Twice during fishing season including at least four species

3 The collection device contains activated charcoal

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

5 Bi-Weekly during growing season.

6 Monthly during growing season. Samples include broad leaf vegetation

26

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table 2 Annual Summary of Radioactivity in the Environs of the Limerick Generating Station Medium or Type and Total Lower Limit of Indicator Location with Highest Annual Control Locations Pathway Sampled Number of Analyses Detection (LLD) Locations Mean Highest Annual Mean (F) / Range1 Mean (F)/Range (Unit of Performed (F)/Range1 Mean Measurement) Name/Distance &

Direction2 Aquatic Environment Surface Water, Gross Beta (48) 4 2.9 (36/36) AQUA Water 3.4 (12/12) 2.9 (12/12)

Drinking Water (1.6 - 5.1) 15F4 (1.6 - 5.0) (1.7 - 5.3)

(pCi/L) 13.9 km Atmospheric Environment Air Particulates Gross Beta (364) 1.0 2.2 (312/312) Limerick Airport 2.6 (52/52) 2.3 (52/52)

(10-2 pCi/m3) (0.7-4.4) 6C1 (1.3 - 4.4) (1.0-3.8) 3.4 km NE Dosimetry Thermoluminescent NA 13.8(256/256) 500KV Substation 21.7 (8/8) 14.2 (64/64)

(mrem/Qtr) Dosimetry (320) ((0.8 - 28.2)) 13S2 (16 - 28.2) (1.4-25.5) 0.04 km SE 1

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

2 From the centerpoint of the containment building

27

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 V. REFERENCES (1) Environmental Report Operating License Stage, Limerick Generating Station, Units 1 and 2, Volumes 1-5 Philadelphia Electric Company (2) NUREG-1302 Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors (3) Branch Technical Position Paper, Regulatory Guide 4.8, Revision 1, November 1979 (4) Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation (5) CY-LG-170-301 Current Revision, Limerick Generating Station Units 1 and 2 Offsite Dose Calculation Manual (6) Constellation Generation Solutions Analytical Sampling Procedures

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

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

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

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

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

f. CY-ES-247, Precipitation Sampling and Collection for Radiological Analysis (7) Constellation Generation Solutions Analytical Procedures

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

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

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

d. CY-ES-246, Sample Preparation for Gross Beta Analysis (8) Limerick Generating Station 2022 Land use Survey (9) CY-AA-170-1000, Radiological Environmental Monitoring Program (REMP) and Meteorological Program Implementation.

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

a. TBE-2001 Alpha Isotopic and Pu-241

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

c. TBE-2007 Gamma Emitting Radioisotope Analysis

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

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

e. TBE-2012 Radioiodine in Various Matrices

f. TBE-2013 Radionickel Activity in Various Matrices 28

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 g.TBE-2018 Radiostrontium Analysis by Chemical Separation (11) GEL Laboratory Procedures

a. GL-RAD-A-002 Tritium

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

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

d. GL-RAD-A-040 Fe-55 (12) Normandeau Associates, Inc. (NAI) Sampling Procedures Current Revisions for Collection of Fish and Bottom Sediment for Radiological Analysis

a. ER6 COLLECTION OF FISH SAMPLES FOR RADIOLOGICAL ANALYSIS

b. ER7 COLLECTION OF SEDIMENT SAMPLES FOR RADIOLOGICAL ANALYSIS (13) Mirion Technologies, Proprietary procedures (14) Teledyne Browne Engineering Environmental Services, 4th Quarter 2022 Quality Assurance Report, January - December 2022 (15) GEL 2022 Annual Environmental Quality Assurance Report for the Radiological Environmental Monitoring Program (REMP)

29

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 APPENDIX A Sample Locations for the REMP Appendix A contains information concerning the environmental samples which were collected during this operating period.

Sample locations and specific information about individual locations for the Limerick Generating Station are given in Table A-1 and A-2. Figure A-1 shows the Environmental Sampling Locations within 1 mile of the Limerick Generating Station. Figures A-2 shows the "Environmental Sampling Locations between 1 and 5 miles" and A-3 shows the "Locations greater than 5 miles from Limerick Generating Station."

30

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE OF CONTENTS - SAMPLING LOCATIONS Table Title Page A-1 Locations of Environmental Sampling Stations for the Limerick Generating Station ......32

A-2 Descriptions of Environmental Sampling Stations for the Limerick Generating Station ..33

Figure Title Page A-1 Limerick Generating Station Sample Locations: Enviornmental Sampling Locations Within 1 mile of the Limerick Generating Station, 2022 ..................................................34

A-2 Limerick Generating Station Sample Locations: Environmental Sampling Locations Between 1 and 5 miles from the Limerick Generating Station, 2022 ................................35

A-3 Limerick Generating Station Sample Locations: Environmental Sampling Locations Greater than 5 miles from the Limerick Generating Station, 2022....................................36

A-4 Gross Beta in Public Water for the Last Ten Years ...........................................................37

A-5 Gross Beta in Air for the Last Ten Years ..........................................................................38

A-6 Annual Trending of Air Activity (Gross Beta) ..................................................................39

A-7 2022 Monthly Gross Beta Concentrations in Drinking Water, (16C2) .............................40

A-8 2022 Weekly Gross Beta Concentrations in Air Particulate Samples from Co-Located Air samplers .............................................................................................................................41

31

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE A-1 Locations of Environmental Sampling Stations for the Limerick Generating Station Distance and Direction from Site Station Description (KM) (Miles) (Sector) 10S3 10S3 0.8 0.5 E 11S1 11S1 0.6 0.4 ESE 11S3 Training Center 0.6 0.3 ESE 13B1 PA American 2.8 1.7 SE 13S3 500 Kv Sub 0.4 0.2 SE 13S4 13S4 0.4 0.2 SE 14S1 14S1 1.0 0.6 SSE 15D1 15D1 5.1 3.2 SE 15F4 15F4 13.9 8.6 SE 15F7 15F7 10.2 6.3 SSE 16B2 16B2 2.2 1.3 SSE 16C2 16C2 4.3 2.7 SSE 16C4 16C4 3.5 2.2 SSE 16C5 16C5 -- -- Downstream of Discharge 18E1 18E1 6.8 4.2 S 19B1 19B1 3.1 2.0 SSW 22B1 22B1 6.1 3.8 SW 22G1 22G1 (Control) 28.5 17.7 SW 23F1 23F1 (Control) 8.1 5.0 SW 24S1 24S1 (Control) 0.3 0.2 SW 25C1 1 25C1 4.3 2.7 WSW 28F3 28F3 (Control) 9.4 5.8 WNW 29C1 29C1 (Control) -- -- Upstream of Intake 31G1 31G1 (Control) 21.9 13.6 NW 33A2 33A2 (Control) 1.4 0.8 NNW 6C1 6C1 3.4 2.1 Ne 11S2 11S2 (QC collocated with 11S1) 0.6 0.4 ESE 1

25C1 Discontinued during 2022 and replaced by 22B1

32

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE A-2 Descriptions of Environmental Sampling Stations for the Limerick Generating Station Distance and Direction from Site Location Location Description (KM) (Miles) (Sector)

Inner Ring 36S2 Evergreen & Sanatoga Road 1.0 0.6 N 3S1 Sanatoga Road 0.7 0.4 NNE 5S1 Possum Hollow Road 0.7 0.4 NE 7S1 LGS Training Center 0.9 0.6 ENE 10S3 Keen Road 0.8 0.5 E 11S1 LGS Information Center 0.6 0.4 ESE 13S2 500 KV Substation 0.7 0.4 SE 14S1 Longview Road 1.0 0.6 SSE 18S2 Rail Line along Longview Road 0.4 0.3 S 21S2 Near Intake Building 0.3 0.2 SSW 23S2 Transmission Tower 0.9 0.5 SW 25S2 Sector Site Boundary 0.7 0.5 WSW 26S3 Met. Tower #2 0.6 0.4 W 29S1 Sector Site Boundary 0.9 0.5 WNW 31S1 Sector Site Boundary 0.4 0.3 NW 34S2 Met. Tower #1 0.9 0.6 NNW Outer Ring 36D1 Siren Tower No. 147 5.6 3.5 N 2E1 Laughing Waters GSC 7.7 4.8 NNE 4E1 Neiffer Road 7.7 4.8 NE 7E1 Pheasant Road 6.9 4.3 ENE 10E1 Royersford Road 6.3 4.0 E 10F3 Trappe Substation 9.0 5.6 ESE 13E1 Vaughn Substation 6.9 4.3 SE 16F1 Pikeland Substation 8.1 5.0 SSE 19D1 Snowden Substation 5.6 3.5 S 20F1 Sheeder Substation 8.4 5.2 SSW 24D1 Porters Mill Substation 6.4 4.0 SW 25D1 Hoffecker & Keim Streets 6.4 4.0 WSW 28D2 W. Cedarville Road 6.2 4.0 W 29E1 Prince Street 8.0 5.0 WNW 31D2 Popular Substation 6.2 4.0 NW 34E1 Varnell Road 7.4 4.6 NNW Control & 5H1 C Birch Substation (control) 40.0 24.8 NE Special Interest 6C1 Limerick Airport 3.4 2.1 NE 9C1 Reed Road 3.5 2.2 E 13C1 King Road 4.6 2.8 SE 15D1 Spring City Substation 5.1 3.2 SE 17B1 Linfield Substation 2.6 1.6 S 20D1 Ellis Woods Road 5.0 3.0 SSW 31D1 Lincoln Substation 4.8 3.0 WNW 33

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-1 Limerick Generating Station Sample Locations Environmental Sampling Locations Within 1 mile of the Limerick Generating Station, 2022

RIDGE PIKE N

NE ENE s

I '*500 750 1,SOO F: i 34

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-2 Limerick Generating Station Sample Locations Environmental Sampling Locations Between 1 and 5 miles from the Limerick Generating Station, 2022

Location25C1wasremovedattheendof2022andin2023wasreplacedbylocation22B1.Mapwillbe

updatedwhenODCMrevision35isapprovedwithlocationchanges

35

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-3 Limerick Generating Station Sample Locations Environmental Sampling Locations Greater than 5 miles from the Limerick Generating Station, 2022 36

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-4 Gross Beta in Public Water for the Last Ten Years 2013-2022 10

_J 0 s C.

0 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

+ 15F4 (I) + 15F7 (I) 16C2 (I) + 28F3 (C) + Control monthly mean + Indicator monthly mean 37

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-5 Gross Beta in Air for the Last Ten Years 2013-2022

7S m so E

g 2S 0

2014 2*) 1S 2016 2017 2018 2019 2020 2021 2022 2023

+ 10S3 (I) -+- 11S1 (I)

11S2 (QC) (I) -r 13S4 (I) + 14S1 (I)

+ 15D1 (I) 22G1 (C) + 6C1 (I) + Control monthly mean Indicator monthly mean 38

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-6 Annual Trending of Air Activity (Gross Beta) 2022 Weekly Gross Beta Concentrations in Air Particulate Samples collect ed for the Limerick Radiological Environmental Monitoring Program as 10*2pCi/m 3 7.50 6.50

., 5.50

~

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.!::! 4.50

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3.50 0.

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,$~

,$\

,$\~

',.:j.

,$,~

',,v.

- 6Cl - llS3 - 11s1 - 14S1 - lSDl - 22Gl Control - 13S4 39

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-7 2022 Monthly Gross Beta Concentrations in Drinking Water, (16C2)

Split between CGS and TBE 10 8

6 4

pCi/Liter 2

0 2

Calendar CGS TBE

40

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure A-8 2022 Weekly Gross Beta Concentrations in Air Particulate Samples from Co-Located Air samplers 11S1 and 11S2 analyzed by CGS and TBE as 10-2pCi/m3

7.5 6.5 5.5 4.5 E2pCi/cubicmeter 3.5 2.5 1.5 0.5 1/10/2022 2/10/2022 3/10/2022 4/10/2022 5/10/2022 6/10/2022 7/10/2022 8/10/2022 9/10/2022 10/10/2022 11/10/2022 12/10/2022 Calendar 11S1 11S2 41

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 APPENDIX B Analysis Results for the REMP Appendix B is a presentation of the analytical results for the Limerick Generating Station radiological environmental monitoring programs.

42

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page B-1 Concentration of Tritium, Gamma Emitters and Gross Beta in Surface and Drinking Water ..................................................................................................................................44

B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish .........................................46

B-3 Concentration of Gamma Emitters in Sediment ................................................................47

B-4 Concentration of Iodine-131 in Filtered Air ......................................................................48

B-5 Concentration of Beta Emitters in Air Particulates............................................................50

B-6 Concentration of Gamma Emitters in Air Particulates ......................................................53

B-7 Concentration of Gamma Emitters in Vegetation Samples ...............................................54

B-8 Concentration of Gamma Emitters (including I-131) in Milk ...........................................55

B-9 Typical MDA Ranges for Gamma Spectrometry ...............................................................57

B-10 Typical LLDs for Gamma Spectrometry ............................................................................58

B-11 Quarterly DLR Results for Limerick Generating Station ...................................................59

43

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-1 Concentration of Gamma Emitters, Tritium, and Gross Beta in Surface and Drinking Water (Results in units of pCi/L +/- 2)

Sample Code Sample Date Gamma Emitters Tritium2 Gross Beta3 13B1 Vincent Dam 1/31/2022

ND 2/28/2022

ND 3/29/2022 * <117 ND 5/2/2022

ND 5/31/2022

ND 6/27/2022 * <170 ND 8/2/2022

ND 8/29/2022

ND 10/3/2022 * <158 ND 10/31/2022

ND 11/29/2022

ND 1/3/2023 * <154 ND 15F4 AQUA Water 1/31/2022

2.85 +/- 0.85 2/28/2022

3.33 +/- 0.90 3/29/2022 * <115 2.56 +/- 0.85 5/2/2022

1.57 +/- 0.81 5/31/2022

2.42 +/- 0.80 6/27/2022 * <167 3.66 +/- 0.94 8/2/2022

4.23 +/- 0.80 8/29/2022

4.88 +/- 0.82 10/3/2022 * <163 5.00 +/- 0.98 10/31/2022

3.06 +/- 0.86 11/29/2022

3.76 +/- 0.88 1/3/2023 * <156 3.66 +/- 0.86 15F7 Phoenixville 1/31/2022

2.57 +/- 0.83 2/28/2022

2.46 +/- 0.84 3/29/2022 * <118 1.72 +/- 0.79 5/2/2022

1.56 +/- 0.81 5/31/2022

1.68 +/- 0.74 6/27/2022 * <173 2.71 +/- 0.88 8/2/2022

4.16 +/- 0.60 8/29/2022

4.44 +/- 0.86 10/3/2022 * <160 4.29 +/- 0.94 10/31/2022

2.75 +/- 0.85 11/29/2022

3.55 +/- 0.86 1/3/2023 * <156 2.36 +/- 0.77 44

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-1 Concentration of Gamma Emitters, Tritium, and Gross Beta in Surface and Drinking Water (Results in units of pCi/L +/- 2)

Sample Code Sample Date Gamma Emitters Tritium2 Gross Beta3 16C2 PA American 1/31/2022

2.57 +/- 0.84 2/28/2022

2.71 +/- 0.87 3/29/2022 * <123 2.06 +/- 0.82 5/2/2022

1.62 +/- 0.82 5/31/2022

1.82 +/- 0.77 6/27/2022 * <164 5.13 +/- 1.03 8/2/2022

2.68 +/- 1.59 8/29/2022

3.39 +/- 0.68 10/3/2022 * <163 1.82 +/- 0.78 10/31/2022

2.02 +/- 0.80 11/29/2022

1.79 +/- 0.75 1/3/2023 * <156 2.37 +/- 0.78 24S11

LGS Intake 1/31/2022

ND 2/28/2022

ND 3/29/2022 * <120 ND 5/2/2022

ND 5/31/2022

ND 6/27/2022 * <172 ND 8/2/2022

ND 8/29/2022

ND 10/3/2022 * <161 ND 10/31/2022

ND 11/29/2022

ND 1/3/2023 * <153 ND 28F31 Pottstown 1/31/2022

3.43 +/- 0.89 2/28/2022

2.06 +/- 0.81 3/29/2022 * <121 2.03 +/- 0.81 5/2/2022

1.68 +/- 0.81 5/31/2022

2.36 +/- 0.79 6/27/2022 * <164 2.63 +/- 0.88 8/2/2022

2.83 +/- 0.78 8/29/2022

4.79 +/- 0.56 10/3/2022 * <160 5.26 +/- 0.99 10/31/2022

2.81 +/- 0.85 11/29/2022

3.13 +/- 0.84 1/3/2023 * <154 2.17 +/- 0.75 1

Control Location 2

Tritium result for the quarterly composite 3

ND, No Data, analysis not required

All Non-Natural Gamma Emitters <MDA 45

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Sample Type Gamma Emitters 16C5 SE Sector 5/19/2022 Bottom Feeder Fish

5/19/2022 Predator Fish

11/01/2022 Bottom Feeder Fish

11/01/2022 Predator Fish

29C11 WNW Sector 5/18/2022 Bottom Feeder Fish

5/18/2022 Predator Fish

10/19/2022 Bottom Feeder Fish

10/19/2022 Predator Fish

1 Control Location

All Non-Natural Gamma Emitters <MDA

46

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-3 Concentration of Gamma Emitters in Sediment (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Gamma Emitters 16B2 SSE Sector 11/14/2022

16C4 SSE Sector 11/14/2022

33A21

NNW Sector 11/14/2022

1 Control Location

All Non-Natural Gamma Emitters <MDA 47

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-4 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Coll date End Coll date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 1/3/2022 1/10/2022 * * * * * *

1/10/2022 1/18/2022 * * * * * *

1/18/2022 1/24/2022 * * * * * *

1/24/2022 1/31/2022 * * * * * *

1/31/2022 2/7/2022 * * * * * *

2/7/2022 2/14/2022 * * * * * *

2/14/2022 2/21/2022 * * * * * *

2/21/2022 2/28/2022 * * * * * *

2/28/2022 3/7/2022 * * * * * *

3/7/2022 3/14/2022 * * * * * *

3/14/2022 3/21/2022 * * * * * *

3/21/2022 3/29/2022 * * * * * *

3/29/2022 4/4/2022 * * * * * *

4/4/2022 4/11/2022 * * * * * *

4/11/2022 4/18/2022 * * * * * *

4/18/2022 4/25/2022 * * * * * *

4/25/2022 5/2/2022 * * * * * *

5/2/2022 5/9/2022 * * * * * *

5/9/2022 5/16/2022 * * * * * *

5/16/2022 5/23/2022 * * * * * *

5/23/2022 5/31/2022 * * * * * *

5/31/2022 6/6/2022 2 6/6/2022 6/13/2022 * * * * * *

6/13/2022 6/20/2022 * * * * * *

6/20/2022 6/27/2022 * * * * * *

6/27/2022 7/5/2022 * * * * * *

48

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-4 Continued Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Coll date End Coll date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 7/5/2022 7/11/2022 * * * * * *

7/11/2022 7/18/2022 * * * * * *

7/18/2022 7/25/2022 * * * * * *

7/25/2022 8/2/2022 * * * * * *

8/2/2022 8/8/2022 * * * * * *

8/8/2022 8/15/2022 * * * * * *

8/15/2022 8/22/2022 * * * * * *

8/22/2022 8/29/2022 * * * * * *

8/29/2022 9/6/2022 * * * * * *

9/6/2022 9/12/2022 * * * * * *

9/12/2022 9/19/2022 * * * * * *

9/19/2022 9/26/2022 * * * * * *

9/26/2022 10/3/2022 * * * * * *

10/3/2022 10/10/2022 * * * * * *

10/10/2022 10/17/2022 * * * * * *

10/17/2022 10/24/2022 * * * * * *

10/24/2022 10/31/2022 * * * * * *

10/31/2022 11/7/2022 * * * * * *

11/7/2022 11/14/2022 * * * * * *

11/14/2022 11/22/2022 * * * * * *

11/22/2022 11/29/2022 * * * * * *

11/29/2022 12/5/2022 * * * * * *

12/5/2022 12/12/2022 * * * * * *

12/12/2022 12/19/2022 * * * * * *

12/19/2022 12/27/2022 * * * * * *

12/27/2022 1/3/2023 * * * * * *

1 Control Location

<MDA (I-131) 49

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-5 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date End Date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 1/3/2022 1/10/2022 3.56 +/- 0.26 3.01 +/- 0.24 2.62 +/- 0.22 2.56 +/- 0.22 3.21 +/- 0.24 2.87 +/- 0.23 3.95 +/- 0.26 1/10/2022 1/18/2022 3.13 +/- 0.22 2.79 +/- 0.22 2.02 +/- 0.19 2.35 +/- 0.21 2.71 +/- 0.21 2.89 +/- 0.23 3.28 +/- 0.23 1/18/2022 1/24/2022 2.77 +/- 0.26 2.82 +/- 0.26 2.78 +/- 0.26 2.17 +/- 0.25 2.65 +/- 0.26 2.05 +/- 0.22 3.19 +/- 0.27 1/24/2022 1/31/2022 3.00 +/- 0.24 2.46 +/- 0.22 2.46 +/- 0.22 2.78 +/- 0.23 2.11 +/- 0.21 2.41 +/- 0.23 2.79 +/- 0.23 1/31/2022 2/7/2022 2.20 +/- 0.21 1.93 +/- 0.20 1.88 +/- 0.20 2.24 +/- 0.21 1.66 +/- 0.19 1.65 +/- 0.21 2.06 +/- 0.21 2/7/2022 2/14/2022 2.64 +/- 0.22 2.31 +/- 0.21 2.23 +/- 0.21 2.64 +/- 0.22 1.58 +/- 0.19 2.44 +/- 0.22 2.44 +/- 0.22 2/14/2022 2/21/2022 2.53 +/- 0.23 1.98 +/- 0.21 1.93 +/- 0.21 2.12 +/- 0.21 1.49 +/- 0.19 2.34 +/- 0.22 2.23 +/- 0.22 2/21/2022 2/28/2022 2.63 +/- 0.23 2.20 +/- 0.22 2.07 +/- 0.21 2.25 +/- 0.22 1.79 +/- 0.20 2.30 +/- 0.22 2.52 +/- 0.23 2/28/2022 3/7/2022 3.17 +/- 0.25 2.39 +/- 0.23 2.37 +/- 0.23 2.86 +/- 0.24 1.94 +/- 0.21 2.70 +/- 0.24 2.79 +/- 0.24 3/7/2022 3/14/2022 1.55 +/- 0.19 1.35 +/- 0.18 1.29 +/- 0.18 1.35 +/- 0.18 1.01 +/- 0.17 1.54 +/- 0.19 1.35 +/- 0.18 3/14/2022 3/21/2022 2.35 +/- 0.22 2.14 +/- 0.21 2.22 +/- 0.21 2.41 +/- 0.22 1.75 +/- 0.20 2.39 +/- 0.22 2.20 +/- 0.21 3/21/2022 3/29/2022 1.30 +/- 0.17 1.00 +/- 0.16 0.85 +/- 0.15 1.00 +/- 0.16 0.70 +/- 0.15 1.10 +/- 0.16 1.05 +/- 0.16 3/29/2022 4/4/2022 2.17 +/- 0.23 1.84 +/- 0.22 1.47 +/- 0.21 2.01 +/- 0.23 1.30 +/- 0.20 1.79 +/- 0.22 1.64 +/- 0.21 4/4/2022 4/11/2022 1.26 +/- 0.18 1.00 +/- 0.17 0.84 +/- 0.16 0.94 +/- 0.17 0.71 +/- 0.16 0.95 +/- 0.17 1.11 +/- 0.17 4/11/2022 4/18/2022 1.89 +/- 0.21 1.43 +/- 0.20 1.28 +/- 0.19 1.39 +/- 0.19 1.03 +/- 0.18 1.67 +/- 0.20 1.70 +/- 0.20 4/18/2022 4/25/2022 2.28 +/- 0.22 1.79 +/- 0.20 1.62 +/- 0.19 1.85 +/- 0.20 1.23 +/- 0.18 1.83 +/- 0.20 1.81 +/- 0.20 4/25/2022 5/2/2022 2.69 +/- 0.23 2.24 +/- 0.21 2.00 +/- 0.20 2.27 +/- 0.21 1.69 +/- 0.19 2.21 +/- 0.21 2.30 +/- 0.21 5/2/2022 5/9/2022 1.70 +/- 0.20 1.42 +/- 0.19 1.26 +/- 0.18 1.48 +/- 0.19 0.96 +/- 0.17 1.65 +/- 0.20 1.52 +/- 0.19 5/9/2022 5/16/2022 1.40 +/- 0.18 1.14 +/- 0.17 1.14 +/- 0.17 1.34 +/- 0.18 0.94 +/- 0.16 1.44 +/- 0.18 1.31 +/- 0.18 5/16/2022 5/23/2022 2.24 +/- 0.21 1.94 +/- 0.20 1.82 +/- 0.19 1.77 +/- 0.19 1.28 +/- 0.17 2.08 +/- 0.20 1.87 +/- 0.19 5/23/2022 5/31/2022 1.52 +/- 0.17 1.21 +/- 0.16 1.07 +/- 0.16 1.28 +/- 0.16 1.09 +/- 0.16 1.34 +/- 0.16 1.24 +/- 0.16 50

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-5 -Continued Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 5/31/2022 6/6/2022 2.44 +/- 0.25 2.01 +/- 0.23 1.78 +/- 0.23 1.67 +/- 0.18 1.43 +/- 0.16 2.51 +/- 0.18 2.07 +/- 0.24 6/6/2022 6/13/2022 2.11 +/- 0.23 1.74 +/- 0.22 1.54 +/- 0.21 1.81 +/- 0.18 1.29 +/- 0.20 2.10 +/- 0.23 1.80 +/- 0.22 6/13/2022 6/20/2022 1.78 +/- 0.24 1.53 +/- 0.22 1.25 +/- 0.23 1.51 +/- 0.23 1.14 +/- 0.20 1.75 +/- 0.24 1.58 +/- 0.22 6/20/2022 6/27/2022 2.37 +/- 0.16 2.09 +/- 0.15 1.87 +/- 0.13 2.15 +/- 0.15 1.48 +/- 0.14 2.28 +/- 0.17 2.22 +/- 0.15 6/27/2022 7/5/2022 2.41 +/- 0.20 2.08 +/- 0.19 1.78 +/- 0.19 1.99 +/- 0.20 1.51 +/- 0.17 2.06 +/- 0.21 2.08 +/- 0.20 7/5/2022 7/11/2022 2.46 +/- 0.23 2.30 +/- 0.21 1.75 +/- 0.21 2.31 +/- 0.20 1.73 +/- 0.18 2.25 +/- 0.21 2.21 +/- 0.21 7/11/2022 7/18/2022 2.84 +/- 0.20 2.41 +/- 0.20 1.91 +/- 0.18 2.48 +/- 0.20 1.65 +/- 0.20 2.61 +/- 0.19 2.57 +/- 0.19 7/18/2022 7/25/2022 3.69 +/- 0.20 3.17 +/- 0.18 2.78 +/- 0.16 3.21 +/- 0.19 2.22 +/- 0.16 3.33 +/- 0.19 3.33 +/- 0.19 7/25/2022 8/2/2022 2.88 +/- 0.28 2.18 +/- 0.29 2.04 +/- 0.28 2.44 +/- 0.27 1.59 +/- 0.25 2.48 +/- 0.28 2.33 +/- 0.29 8/2/2022 8/8/2022 2.72 +/- 0.26 2.33 +/- 0.22 2.41 +/- 0.20 2.60 +/- 0.23 1.81 +/- 0.19 2.38 +/- 0.24 2.25 +/- 0.24 8/8/2022 8/15/2022 2.20 +/- 0.26 1.95 +/- 0.24 1.77 +/- 0.27 1.97 +/- 0.27 1.59 +/- 0.21 2.11 +/- 0.23 1.77 +/- 0.25 8/15/2022 8/22/2022 2.94 +/- 0.17 2.52 +/- 0.17 2.30 +/- 0.16 2.59 +/- 0.17 2.00 +/- 0.16 2.89 +/- 0.17 2.64 +/- 0.15 8/22/2022 8/29/2022 3.99 +/- 0.20 3.08 +/- 0.21 2.84 +/- 0.20 3.19 +/- 0.21 2.33 +/- 0.19 3.40 +/- 0.21 3.54 +/- 0.20 8/29/2022 9/6/2022 2.75 +/- 0.30 2.32 +/- 0.26 2.11 +/- 0.25 2.45 +/- 0.26 1.81 +/- 0.23 2.62 +/- 0.27 2.43 +/- 0.29 9/6/2022 9/12/2022 2.27 +/- 0.29 1.93 +/- 0.27 1.67 +/- 0.27 2.03 +/- 0.27 1.50 +/- 0.25 1.99 +/- 0.30 1.88 +/- 0.29 9/12/2022 9/19/2022 3.16 +/- 0.25 2.30 +/- 0.22 2.07 +/- 0.22 2.60 +/- 0.23 1.75 +/- 0.20 2.69 +/- 0.23 2.24 +/- 0.22 9/19/2022 9/26/2022 3.63 +/- 0.26 3.05 +/- 0.24 2.57 +/- 0.22 2.95 +/- 0.24 2.02 +/- 0.20 3.13 +/- 0.24 2.86 +/- 0.23 9/26/2022 10/3/2022 1.90 +/- 0.20 1.61 +/- 0.19 1.39 +/- 0.18 1.55 +/- 0.19 1.27 +/- 0.18 1.50 +/- 0.19 1.69 +/- 0.19 10/3/2022 10/10/2022 2.48 +/- 0.23 2.08 +/- 0.21 1.67 +/- 0.20 2.02 +/- 0.21 1.43 +/- 0.19 2.07 +/- 0.21 1.74 +/- 0.20 10/10/2022 10/17/2022 4.09 +/- 0.28 3.64 +/- 0.26 3.00 +/- 0.25 3.69 +/- 0.26 2.62 +/- 0.24 3.54 +/- 0.26 3.85 +/- 0.27 10/17/2022 10/24/2022 2.56 +/- 0.23 2.49 +/- 0.23 2.49 +/- 0.23 2.30 +/- 0.22 1.96 +/- 0.21 2.31 +/- 0.22 2.38 +/- 0.22 10/24/2022 10/31/2022 1.51 +/- 0.19 1.30 +/- 0.18 1.41 +/- 0.18 1.42 +/- 0.18 1.08 +/- 0.17 1.13 +/- 0.17 1.29 +/- 0.18 51

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-5 -Continued Concentration of Beta Emitters in Air Particulates)

(Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 10/31/2022 11/7/2022 2.95 +/- 0.24 2.75 +/- 0.23 2.64 +/- 0.23 2.56 +/- 0.22 2.14 +/- 0.21 2.52 +/- 0.23 2.96 +/- 0.25 11/7/2022 11/14/2022 1.96 +/- 0.21 1.78 +/- 0.20 1.95 +/- 0.21 1.82 +/- 0.20 1.57 +/- 0.19 1.67 +/- 0.19 1.65 +/- 0.20 11/14/2022 11/22/2022 2.48 +/- 0.20 2.62 +/- 0.20 2.42 +/- 0.20 2.30 +/- 0.20 1.96 +/- 0.18 2.35 +/- 0.19 2.04 +/- 0.18 11/22/2022 11/29/2022 4.44 +/- 0.27 3.85 +/- 0.26 3.92 +/- 0.26 3.84 +/- 0.26 3.07 +/- 0.23 3.77 +/- 0.26 3.66 +/- 0.25 11/29/2022 12/5/2022 3.26 +/- 0.27 2.74 +/- 0.25 2.74 +/- 0.25 2.53 +/- 0.25 2.03 +/- 0.23 2.48 +/- 0.25 2.55 +/- 0.25 12/5/2022 12/12/2022 2.88 +/- 0.23 2.51 +/- 0.22 2.58 +/- 0.22 2.41 +/- 0.21 1.90 +/- 0.19 2.47 +/- 0.22 2.48 +/- 0.22 12/12/2022 12/19/2022 2.07 +/- 0.20 1.75 +/- 0.19 1.88 +/- 0.19 1.81 +/- 0.19 1.60 +/- 0.19 2.13 +/- 0.21 1.83 +/- 0.20 12/19/2022 12/27/2022 2.71 +/- 0.21 2.31 +/- 0.19 2.56 +/- 0.20 2.24 +/- 0.19 1.84 +/- 0.18 2.64 +/- 0.20 2.42 +/- 0.21 12/27/2022 1/3/2023 3.44 +/- 0.24 2.90 +/- 0.23 3.53 +/- 0.25 3.05 +/- 0.23 2.62 +/- 0.22 3.23 +/- 0.24 2.82 +/- 0.23 1

Control Location 52

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-6 Concentration of Gamma Emitters in Air Particulates (Results in units of 10-3 pCi/m3 +/- 2)

Start Date Stop Date 6C1 10S3 11S1 14S1 15D1 22G11 13S4 1/3/2022 3/29/2022 * * * * * *

3/29/2022 6/27/2022 * * * * * *

6/27/2022 10/3/2022 * * * * * *

10/3/2022 1/3/2023 * * * * * * *

1 Control Location

All Non-Natural Gamma Emitters <MDA

53

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-7 Concentration of Gamma Emitters in Vegetation Samples (Results in units of pCi/kg (wet) +/- 2)

Sample Code Sample Date Sample Type Gamma Emitters 11S3 LGS 6/21/2022 Broccoli

Information Ctr 6/21/2022 Cauliflower

6/21/2022 Cabbage

7/14/2022 Cauliflower

7/14/2022 Swiss Chard

7/14/2022 Broccoli

8/16/2022 Swiss Chard

8/16/2022 Cauliflower

8/16/2022 Kale

9/19/2022 Swiss Chard

9/19/2022 Yellow Squash Leaves

9/19/2022 Cucumber

13S3 LGS 6/21/2022 Broccoli

500 KV Yard 6/21/2022 Cauliflower

6/21/2022 Cabbage

7/14/2022 Cauliflower

7/14/2022 Cabbage

7/14/2022 Swiss Chard

8/16/2022 Kale

8/16/2022 Cauliflower

8/16/2022 Swiss Chard

9/19/2022 Swiss Chard

9/19/2022 Kale

9/19/2022 Collards

31G11 Jollyview Farm 6/21/2022 Yellow Squash Leaves

6/21/2022 Cabbage

6/21/2022 Broccoli

7/14/2022 Yellow Squash Leaves

7/14/2022 Zucchini

7/14/2022 Broccoli

8/16/2022 Zucchini

8/16/2022 Yellow Squash Leaves

8/16/2022 Melon Leaves

9/19/2022 Yellow Squash Leaves

9/19/2022 Cucumber

9/19/2022 Pumpkin

1 Control Location

All Non-Natural Gamma Emitters <MDA

54

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-8 Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2 Sample Code Sample Date Gamma Emitters 18E1 Miller Farm 1/18/2022

2/15/2022

3/1/2022

4/11/2022

4/25/2022

5/10/2022

5/23/2022

6/7/2022

6/21/2022

7/5/2022

7/18/2022

8/2/2022

8/16/2022

8/30/2022

9/12/2022

9/27/2022

10/11/2022

10/24/2022

11/8/2022

11/22/2022

12/6/2022

19B1 Kolb Farm 1/18/2022

2/15/2022

3/1/2022

4/11/2022

4/25/2022

5/10/2022

5/23/2022

6/7/2022

6/21/2022

7/5/2022

7/18/2022

8/2/2022

8/16/2022

8/30/2022

9/12/2022

9/27/2022

10/11/2022

10/24/2022

11/8/2022

11/22/2022

12/6/2022

55

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-8 Concentration of Gamma Emitters (including I-131) in Milk (Results in units of pCi/Liter +/- 2 Sample Code Sample Date Gamma Emitters 23F11 Guest Farm 1/18/2022

2/15/2022

3/1/2022

4/11/2022

4/25/2022

5/10/2022

5/24/2022

6/7/2022

6/21/2022

7/5/2022

7/18/2022

8/2/2022

8/16/2022

8/30/2022

9/12/2022

9/27/2022

10/11/2022

10/24/2022

11/8/2022

11/22/2022

12/6/2022

25C1 Kulp Farm 1/18/2022

2/15/2022

3/1/2022

4/11/2022

2 4/25/2022 22B1 Pigeon Creek Farm Replaces 25C1 12/6/2022

1 Control Locations 2

Samples No Longer Available

All Non-Natural Gamma Emitters <MDA 56

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-9 Typical MDA Ranges for Gamma Spectrometry Surface Air Shoreline Selected Water, Fish Ground water Milk Oysters Soil (pCi/kg) Vegetation Particulates Sediment Nuclides Drinking (pCi/kg) Wet (pCi/L) (pCi/L) (pCi/kg) Dry (pCi/kg) Wet (10-3 pCi/m3) (pCi/kg)Dry Water (pCi/L)

K-40 5.65 - 24.6 16 - 182 2,747 - 4,505 21.5 -66.4 1,286 - 1,529 1,269 - 2,069 781 - 13,761 789 - 10,713 671 - 11,829 Mn-54 0.32 - 1.16 2.7 - 5.6 9.8 - 19.6 2.86 - 5.14 3.6 - 6.6 10.8 - 16.4 41.4 - 67.1 37.4 - 91.9 10.3 - 53.0 Fe-59 1.01 - 8.52 5.6 - 13.2 31.6 - 93.2 6.04 - 11.7 9.2 - 15.9 29.3 - 56.7 142 - 251 96.4 - 389 22.0 - 151 Co-58 0.38 - 2.07 2.7 - 5.6 10.9 - 28.3 2.86 - 5.27 3.7 - 6.3 10.5 - 19.3 53.7 - 82.9 44.6 - 133 10.9 - 59.8 Co-60 0.28 - 1.09 2.8 - 5.5 10.9 - 24.3 3.01 - 5.38 4.1 - 7.2 11.7 - 17.0 38.6 - 57.9 32.8 - 85.8 12.9 - 55.0 Zn-65 0.81 - 3.10 5.5 - 11.4 23.3 - 57.2 6.41 - 14.4 9.4 - 16.1 22.0 - 43.3 112 - 198 96.4 - 275 24.7 - 116 Ag-110m 0.33 - 1.06 2.42 - 4.96 8.2 - 18.1 2.79 - 5.06 3.26- 5.64 8.7 - 16.0 36.6 - 175 40.7 - 99.4 10.1 - 61.4 Zr-95 0.72 - 3.88 4.7 - 10.2 20.0 - 47.1 5.62 - 8.75 5.8 - 11.5 19.0 - 34.0 93.5 - 151 84.6 - 261 19.3 - 116 Nb-95 0.56 - 4.91 2.9 - 6.0 13.7 - 42.7 3.3 - 5.88 3.9 - 6.5 13.9 - 24.3 82.1 - 157 61.5 - 227 10.9 - 90.5 Ru-106 3.00 - 12.1 23.8 - 48.1 77.1 - 197 25.6 - 45.3 29.3 - 51.8 88.0 - 141 327.0 - 570 314.0 - 840 92.9 - 541 1

I-131 2.73 - 914 0.52 - 11.7 21.4 - 2,340 4.87 - 9.04 0.5 - 7.03 22.4 - 107 470 - 2,040 139 - 8,060 13.4 - 854 Cs-134 0.47 - 0.88 3.2 - 5.7 7.8 - 16.0 2.92 - 5.48 4.09 - 4.82 9.7 - 16.5 43.3 - 82.4 33.4 - 109 11.1 - 58.1 Cs-137 0.46 - 0.88 3.7 - 5.9 3.8 - 17.5 2.97 - 5.43 4.08 - 5.29 10.0 - 16.7 38.4 - 65.4 39.1 - 135 11.1 - 62.3 La-140 2.01 - 116 5.05 - 11.5 15.9 - 444 4.87 - 10.3 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 9.1 - 388 Ba-140 2.01 - 116 5.05 - 11.5 15.9 - 444 5.86 - 26.0 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 9.1 - 388 Ce-144 1.12 - 3.27 16.8 - 36.7 38.1 - 70.9 17.8 - 32.0 20.5 - 31.0 42.6 - 72.6 208 - 279 191 - 414 46.6 - 289 Cr-51 4.90 - 45.0 23.2 - 50.6 93.0 - 395 26.7 - 42.1 30.4 - 46.8 97.0 - 199 711 - 1,110 489 - 1,810 93.9 - 850 Na-22 0.34 - 1.33 2.7 - 6.0 12.1 - 28.0 2.78 - 5.94 4.9 - 8.5 13.4 - 19.5 46.4 - 77.4 36.4 - 92.4 8.9 - 54.1 1 -3 -2 This MDA range for I-131 on a charcoal cartridge is typically 5.22 x 10 to 1.37 x 10 pCi/m3 57

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-10 Typical LLDs for Gamma Spectrometry Surface Water, Selected Air Particulates Fish pCi/kg Ground water Oysters pCi/kg Soil pCi/kg Vegetation Drinking Water Milk pCi/L Nuclides 10-3 pCi/m3 (wet) pCi/L (wet) (dry) pCi/kg (wet) pCi/L Na-22 5 5.3 12 5.3 12 9.1 78 27 Cr-51 74 37 76 37 76 62 452 174 Mn-54 4.6 4.7 13 4.7 13 7.4 63 19 Co-58 6.7 4.3 12 4.3 12 8.2 78 23 Fe-59 20 11 27 11 27 18 123 57 Co-60 3.5 4.8 12 4.8 12 7.5 59 24 Zn-65 8.9 11 27 11 27 17 162 55 Nb-95 9.8 4.5 13 4.5 13 9.5 73 25 Zr-95 11 7.9 18 7.9 18 14 117 34 Ru-106 43 38 111 38 111 62 624 174 Ag-110m 4.2 4.3 11 4.3 11 6 65 20 Te-129m 101 56 118 56 118 90 833 263 I-131* 90 0.8 11 6.4 11 0.8 58 42 Cs-134 4.7 4.7 11 4.7 11 6.7 66 18 Cs-137 4.2 5.1 11 5.1 11 6.9 78 21 Ba-140 47 23 39 23 39 46 103 111 La-140 47 9.2 15 9.2 15 13 103 30 Ce-144 15 23 45 23 45 37 288 70

The LLD for I-131 measured on a Charcoal cartridge is 3.7 x10-2 pCi/m3 58

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-11

Quarterly DLR Results for Limerick Generating Station

(Results in Units of mR/91 days +/- 2)

Normalized Annual Quarter Quarter Quarter Quarter Annual Dose, BA + Annual Facility Facility Dose, Location 1 2 3 4 MA (mrem/yr) BA MDDA Dose, FA (mrem) FA >10 mrem 10E1 19.1 7.4 8.4 20.7 55.6 71.0 82.7 ND No 10F3 18.3 8.1 7.3 21.6 55.3 69.7 81.4 ND No 10S3 18.8 8.7 7.3 22.2 57.1 70.9 82.6 ND No 11S1 21.9 12.0 14.4 24.4 72.6 83.1 94.8 ND No 13C11 13.7 3.5 1.4 15.6 34.1 49.8 61.5 ND No 13E1 19.0 12.0 8.4 21.4 60.8 70.1 81.8 ND No 13S2 26.1 16.5 16.0 28.2 86.9 112.1 123.8 ND No 14S1 16.7 8.7 6.2 19.1 50.7 63.2 74.9 ND No 15D11 19.1 12.6 8.9 21.3 61.9 72.5 84.2 ND No 16F11 19.0 10.0 7.3 21.3 57.6 73.4 85.1 ND No 17B1 18.2 10.0 6.2 19.1 53.5 66.8 78.5 ND No 18S2 20.6 11.3 9.5 22.7 64.1 78.4 90.1 ND No 19D1 19.1 8.7 6.2 19.9 53.9 66.3 78.0 ND No 20D11 17.7 7.4 5.7 19.3 50.1 63.0 74.7 ND No 59

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-11 Direct Radiation

(Results in Units of mR/91 days +/- 2)

Normalized Annual Quarter Quarter Quarter Quarter Annual Dose, BA + Annual Facility Facility Dose, Location 1 2 3 4 MA (mrem/yr) BA MDDA Dose, FA (mrem) FA >10 mrem 20F1 18.7 8.7 6.2 20.7 54.3 67.5 79.2 ND No 21S2 18.8 9.4 6.2 20.0 54.5 64.1 75.8 ND No 23S2 16.7 8.1 5.1 18.3 48.2 63.9 75.6 ND No 24D1 16.0 8.1 4.6 17.9 46.5 59.7 71.4 ND No 25D1 14.9 8.1 3.5 17.1 43.6 56.5 68.2 ND No 25S2 16.4 7.4 8.4 17.7 49.9 58.1 69.8 ND No 26S3 16.0 8.7 4.6 18.3 47.6 60.4 72.1 ND No 28D2 17.5 8.7 8.9 19.0 54.1 63.5 75.2 ND No 29E1 17.1 6.8 7.9 19.4 51.1 62.3 74.0 ND No 29S1 16.5 6.8 5.1 17.9 46.3 61.4 73.1 ND No 2E1 18.2 10.7 7.3 21.3 57.4 71.9 83.6 ND No 31D11 21.8 12.6 13.3 23.1 70.8 83.0 94.7 ND No 31D2 19.1 15.9 8.9 20.2 64.1 71.2 82.9 ND No 31S1 19.8 12.6 7.3 21.7 61.4 71.6 83.3 ND No 34E1 17.6 12.0 5.7 19.7 55.0 67.0 78.7 ND No 60

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table B-11 Direct Radiation (Results in Units of mR/91 days +/- 2)

Normalized Annual Quarter Quarter Quarter Quarter Annual Dose, BA + Annual Facility Facility Dose, Location 1 2 3 4 MA (mrem/yr) BA MDDA Dose, FA (mrem) FA >10 mrem 34S2 18.7 16.5 5.1 20.5 60.9 71.6 83.3 ND No 36D1 14.9 8.1 4.1 17.6 44.6 62.1 73.8 ND No 36S2 19.0 9.4 6.8 20.7 55.8 73.4 85.1 ND No 3S1 18.6 8.1 7.3 20.5 54.4 70.1 81.8 ND No 4E1 14.4 2.2 0.8 15.6 32.9 51.4 63.1 ND No 5H11 22.9 15.2 10.6 25.5 74.1 86.3 98.0 ND No 5S1 20.5 9.4 10.6 23.6 64.0 80.0 91.7 ND No 6C11 18.7 6.1 13.8 20.0 58.7 69.5 81.2 ND No 7E1 19.9 8.1 7.3 21.7 57.0 74.6 86.3 ND No 7S1 19.9 9.4 5.7 21.0 55.9 73.1 84.8 ND No 9C11 18.2 3.5 6.8 19.7 48.2 68.1 79.8 ND No 1

Control & Special Interest Locations 61

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 APPENDIX C Quality Assurance Program Appendix C is a summary of Constellation Generation Solutions (CGS) laboratorys quality assurance program. It consists of Table C-1 which is a compilation of the results of the CGS Laboratorys participation in an interlaboratory comparison program with Environmental Resource Associates (ERA) located in Arvada, Colorado and Eckert and Ziegler Analytics, Inc. (EZA) located in Atlanta, Georgia.

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

The CGS Laboratory's results contained in Table C-1, intercomparison results, are in full agreement when they were evaluated using the NRC Resolution Test Criteria [1] except as noted in the Pass/Fail column and described below. The CGS Laboratory's results are provided with their analytical uncertainties of 2 sigma. When evaluating with the NRC Resolution Test a one sigma uncertainty is used to determine Pass or Fail and noted accordingly.

All results reported passed their respective vendor acceptance ranges and NRC Resolution Test Criteria [1] with one exception for the Gross Beta Study ERA RAD 129, reference date 4/4/2022. The CGS result passed the low end of vendor acceptance criteria but failed NRC Resolution Test Criteria. Low recovery of activity was likely due to an ineffective residue correction factor that undercompensates for the significant residue weight present in the study accounting for the low result reported. This low value and a low uncertainty in turn resulted in an NRC Resolution Test Criteria Failure. A set of 3rd party, NIST traceable standards has been procured to build a residue correction curve for more accurate results going forward. This event has been entered into the Corrective Action Program for tracking and to prevent future occurrence (IR 04559044).

All results reported passed their respective vendor acceptance ranges and NRC Resolution Test Criteria [1].

The vendor laboratories used by CGS for subcontracting and interlaboratory comparison samples, GEL Laboratories and TBE, also participate in the ERA and EZA interlaboratory comparison program. A presentation of their full data report is provided in their Annual Environmental Quality Assurance Program Reports, (Ref 14,15). In summary, GEL and TBE reported results met vendor and laboratory acceptance ranges with the following exceptions discussed here:

62

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353

1. TBE result for Air particulate Ce-144 submitted for a study in March 2022 failed the upper acceptance limit. The laboratory investigated and the study results were outside the acceptable range specified in TBE's QA plan, 70-130% of True Value, but would have been acceptable when taking the uncertainty into account. A duplicate study was analyzed on two other detectors and passed the upper acceptance limit. In both cases, TBE's published QA requirements of acceptable range being 70-130% of True value were met. The lab's performance is within the acceptable range specified in their QA plan. This same range is considered acceptable by Constellation Nuclear Quality Assurance Requirements as well. TBE states in their investigation that there was no impact to sample data and no further action is warranted.

2. TBE result for Air particulate Co-60 study in September 2022 failed the upper acceptance limit. The laboratory investigated and the study results were outside the acceptable range specified in TBE's QA plan, 70-130% of True Value. The study was analyzed as a duplicate on another detector and passed within 114% of True Value. Historical results for Air particulate Co-60 have ranged from 91% - 141% with a mean of 91%. The lab determined no correction action needed at this time as it is the first failure for this nuclide for Air particulate.

3. GEL results for MRAD-37 Sr-90 failed vendor acceptance criteria, exceeding the maximum range for both vegetation and water. The laboratory review did not reveal any gross errors or possible contributors to the high bias. During this same analysis time period, the laboratory successfully analyzed these same matrices in PT for MAPEP-47 which required the same preparation and analysis processes and procedures. The lab will continue to monitor the recoveries of these parameters to ensure there are no continued issues.

The Inter and Intra laboratory results contained in Table C-2 are intercomparison results for routine samples analyzed for replicate and split analyses and evaluated for beta and non-natural gamma emitters. The CGS Laboratorys results are provided with their analytical uncertainties of 2 sigma. When evaluating with the NRC Resolution Test a one sigma uncertainty is used to determine Pass or Fail and noted accordingly. In the event there are no non-natural isotopes detected, the samples are reported <MDA and designated as Pass.

All the results contained in Table C-2 agree with their respective CGS laboratory original, replicate and/or TBEs split laboratory sample according to NRC Resolution Test Criteria1. The results for separate air samplers collocated at 11S1 and 11S2 analyzed by CGS and TBE respectively are provided in Table C-2a for Air Iodine and C-2b for the Beta particulate. The results are generally in trend and a plot of the data between the two locations is found in the main body of the report, Figure A-8.

63

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 There were three of the 4 quarterly samples for soil at SFS3 that indicated low level, Non-Plant related Cs-137 just above the analyses Minimum Detectable Activity. This activity has been investigated previously and levels are in trend with historical data at this location.

1. The original analysis of soil collected on February 21, 2022, at SFS3 indicated low level, Non-Plant related Cs-137 just above the analyses Minimum Detectable Activity at 146 +/-

61.9 pCi/kg. The replicate and split samples also indicated Cs-137 above the Minimum Detectable Activity, MDA, at 212 +/-37.5 pCi/kg and 141+/-83.0 pCi/kg, respectively.

2. The original analysis of soil collected on June 6, 2022, at SFS3 indicated low level, Non-Plant related Cs-137 just above the analyses Minimum Detectable Activity at 140 +/- 56.2 pCi/kg. The replicate analysis confirmed Cs-137 above the Minimum Detectable Activity, MDA, at 98.9 +/-52.3 pCi/kg and results are in agreement when evaluated using the NRC Resolution Test Criteria1.

3. The original analysis of soil collected on November 15, 2022, at SFS3 indicated low level, Non Plant related Cs-137 just above the analyses Minimum Detectable Activity at 133 +/- 55.3 pCi/kg. The replicate analysis confirmed Cs-137 above the Minimum Detectable Activity, MDA, at 169 +/-61.3 pCi/kg and these results are in agreement when evaluated using the NRC Resolution Test Criteria1.

The original, replicate and split results pass the NRC Resolution Test Criteria1, as specified in the rule. The low-level Cs-137 observed in these soil analyses is consistent with weapons related fallout previously identified in the environs around Limerick Generating Station.

All air particulate samples contain Beta emitters and are reported with a 2 sigma uncertainty. The original and replicate analyses are evaluated for agreement using the NRC Resolution Test Criteria1. These samples must be composited for further analysis and this precludes them from being split for analysis of beta emitters. These filters and other samples whose nature generally preclude sample splitting are marked ** in the Split Analysis column.

64

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE OF CONTENTS -Appendix C ANALYTICAL RESULTS Table Title Page C-1 Results of Participation in Cross Check Programs ............................................................66

C-2 Results of Quality Assurance Program ..............................................................................72

C-2a Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2:

Concentration of Iodine-131 in Filtered Air ......................................................................84

C-2b Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2:

Concentration of Beta Emitters in Air Particulates............................................................87 C-3 Limerick Generating Station ODCM Required LLDs .......................................................89

65

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-1 Results of Participation in Cross Check Programs NRC Reported Sample Equip Isotope Cross Check Resolution Vendor Study ID Sample Type Units Laboratory's Date ID Observed Lab Results Test Results Pass / Fail 1 3/10/2022 ANA E13643 Milk Gamma pCi/L D4 Ce-141 58.6 +/- 11.5 64.6 Pass Co-58 160 +/- 15.6 164 Pass Co-60 313 +/- 15.8 302 Pass Cr-51 390 +/- 95.0 339 Pass Cs-134 168 +/- 8.98 182 Pass Cs-137 222 +/- 17.4 223 Pass Fe-59 185 +/- 20.8 185 Pass I-131 98.9 +/- 21.6 96.7 Pass Mn-54 157 +/- 14.8 164 Pass Zn-65 231 +/- 31.7 246 Pass 3/10/2022 ANA E13643 Milk Gamma pCi/L D5 Ce-141 71.6 +/- 16.3 64.6 Pass Co-58 164 +/- 15.1 164 Pass Co-60 302 +/- 14.8 302 Pass Cr-51 398 +/- 107 339 Pass Cs-134 168 +/- 9.67 182 Pass Cs-137 212 +/- 16.0 223 Pass Fe-59 207 +/- 21.3 185 Pass I-131 96.2 +/- 26.7 96.7 Pass Mn-54 166 +/- 15.0 164 Pass Zn-65 230 +/- 31.0 246 Pass 66

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 3/10/2022 ANA E13644 Water Beta pCi/L S5E Cs-137 224 +/- 4.43 222 Pass 3/10/2022 ANA E13645 Cartridge Gamma pCi D2 I-131 81.9 +/- 8.35 88.2 Pass D3 I-131 84.7 +/- 7.96 88.2 Pass D4 I-131 82.0 +/- 7.39 88.2 Pass 4/4/2022 ERA RAD129 Water Gamma pCi/L D4 Ba-133 56.6 +/- 4.24 62.9 Pass Cs-134 81.0 +/- 3.61 81.6 Pass Cs-137 37.8 +/- 4.54 36.6 Pass Co-60 97.6 +/- 5.11 97.4 Pass Zn-65 293 +/- 17.9 302 Pass 4/4/2022 ERA RAD129 Water Beta pCi/L S5E Cs-137 35.8 +/- 1.88 51.0 Fail1 4/4/2022 ERA RAD129 Water Gamma pCi/L D4 I-131 27.1 +/- 4.39 26.2 Pass 6/16/2022 ANA E13646 Water Beta pCi/L S5E Cs-137 250 +/- 4.66 260 Pass 6/16/2022 ANA E13647 Water Gamma pCi/L D3 Ce-141 141 +/- 15.5 139 Pass Co-58 126 +/- 14.9 128 Pass Co-60 244 +/- 12.6 242 Pass Cr-51 314 +/- 84.7 344 Pass Cs-134 163 +/- 9.09 172 Pass Cs-137 213 +/- 15.4 204 Pass Fe-59 170 +/- 19.0 157 Pass I-131 112 +/- 22.6 91.2 Pass Mn-54 243 +/- 16.9 229 Pass Zn-65 302 +/- 30.5 296 Pass 67

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 6/16/2022 ANA E13647 Water Gamma pCi/L D4 Ce-141 126 +/- 14.6 139 Pass Co-58 124 +/- 13.8 128 Pass Co-60 248 +/- 13.1 242 Pass Cr-51 358 +/- 92.9 344 Pass Cs-134 163 +/- 9.11 172 Pass Cs-137 217 +/- 15.8 204 Pass Fe-59 180 +/- 19.0 157 Pass I-131 86.2 +/- 24.2 91.2 Pass Mn-54 253 +/- 17.0 229 Pass Zn-65 253 +/- 30.2 296 Pass 6/16/2022 ANA E13648 Filter Gamma pCi D5 Ce-141 101 +/- 5.17 96.6 Pass Co-58 89.3 +/- 4.93 89.3 Pass Co-60 169 +/- 4.85 168 Pass Cr-51 252 +/- 34.6 239 Pass Cs-134 100 +/- 2.67 119 Pass Cs-137 142 +/- 5.25 142 Pass Fe-59 129 +/- 8.07 109 Pass Mn-54 168 +/- 5.97 159 Pass Zn-65 211 +/- 11.7 206 Pass 6/16/2022 ANA E13648 Filter Gamma pCi D4 Ce-141 96.7 +/- 7.64 97.0 Pass Co-58 89.2 +/- 7.09 89.0 Pass Co-60 171 +/- 7.27 168 Pass Cr-51 265 +/- 35.4 239 Pass Cs-134 104 +/- 4.09 119 Pass Cs-137 147 +/- 7.98 142 Pass Fe-59 136 +/- 10.6 109 Pass 68

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Mn-54 170 +/- 9.08 159 Pass Zn-65 198 +/- 16.4 206 Pass 6/16/2022 ANA E13649 Filter Beta pCi S5E Cs-137 276 +/- 3.47 242 Pass S5E Cs-137 276 +/- 3.47 242 Pass S5E Cs-137 275 +/- 3.47 242 Pass 9/15/2022 ANA E13650A Filter Beta pCi S5E Cs-137 242 +/- 3.25 224 Pass 9/19/2022 ERA MRAD037 Filter Gamma pCi D4 Cs-134 270 +/- 6.71 325 Pass Cs-137 706 +/- 19.3 795 Pass Co-60 198 +/- 8.36 191 Pass Zn-65 125 +/- 16.5 120 Pass 10/7/2022 ERA RAD131 Water Gamma pCi/L D4 Ba-133 75.0 +/- 3.79 79.4 Pass Cs-134 29.0 +/- 2.09 30.5 Pass Cs-137 212 +/- 7.45 212 Pass Co-60 50.4 +/- 3.06 51.4 Pass Zn-65 212 +/- 12.8 216 Pass I-131 25.4 +/- 6.03 24.4 Pass 12/1/2022 ANA E13651 Filter Gamma pCi D4 Ce-141 144 +/- 9.4 140 Pass Co-58 143 +/- 12.0 144 Pass Co-60 174 +/- 10.0 181 Pass Cr-51 287 +/- 54.4 290 Pass Cs-134 93.0 +/- 5.59 120 Pass Cs-137 134 +/- 10.7 137 Pass Fe-59 142 +/- 15.9 124 Pass Mn-54 162 +/- 12.1 158 Pass 69

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Zn-65 192 +/- 23.5 191 Pass 12/1/2022 ANA E13651 Filter Gamma pCi D5 Ce-141 146 +/- 8.6 140 Pass Co-58 140 +/- 10.1 144 Pass Co-60 180 +/- 8.97 181 Pass Cr-51 286 +/- 46.1 290 Pass Cs-134 94.5 +/- 48.6 120 Pass Cs-137 125 +/- 91.6 137 Pass Fe-59 148 +/- 12.8 124 Pass Mn-54 172 +/- 10.4 158 Pass Zn-65 199 +/- 20.3 191 Pass 12/1/2022 ANA E13652 Water Beta pCi/L S5E Cs-137 308 +/- 5.11 283 Pass 12/1/2022 ANA E13653 Cartridge Gamma pCi D2 I-131 88.7 +/- 9.50 91.6 Pass D3 I-131 88.5 +/- 9.40 91.6 Pass D4 I-131 93.5 +/- 8.60 91.6 Pass D5 I-131 89.8 +/- 9.10 91.6 Pass 12/1/2022 ANA E13654 Milk Gamma pCi/L D4 Ce-141 223 +/- 19.5 225 Pass Co-58 222 +/- 19.7 230 Pass Co-60 281 +/- 16.3 290 Pass Cr-51 433 +/- 111 464 Pass Cs-134 182 +/- 114 191 Pass Cs-137 214 +/- 18.6 219 Pass Fe-59 220 +/- 23.3 198 Pass I-131 104 +/- 22.1 95.1 Pass Mn-54 252 +/- 19.7 252 Pass Zn-65 274 +/- 38.0 305 Pass 70

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 12/1/2022 ANA E13654 Milk Gamma pCi/L D5 Ce-141 228 +/- 19.1 225 Pass Co-58 226 +/- 17.7 230 Pass Co-60 285 +/- 14.9 290 Pass Cr-51 494 +/- 110 464 Pass Cs-134 179 +/- 10.1 191 Pass Cs-137 231 +/- 18.0 219 Pass Fe-59 214 +/- 21.6 198 Pass I-131 102 +/- 23.0 95.1 Pass Mn-54 252 +/- 18.6 252 Pass Zn-65 282 +/- 33.4 305 Pass 1

See discussion at the beginning of the Appendix

71

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-2 Results of Quality Assurance Program Sample Type and Sample Type of Result Original Replicate Pass/Fail Pass/Fail Split Analysis (Replicate) (Split)

Location Date Analysis Units Analysis Analysis Water - Circ in 1/3/2022 Gross Beta pCi/L 2.03 +/- 0.8 2.95 +/- 0.8 ** Pass NA Water - Circ Out 1/3/2022 Gross Beta pCi/L 2.53 +/- 0.8 2.94 +/- 0.8 ** Pass NA Water - OWD 1/3/2022 Gross Beta pCi/L 2.11 +/- 0.8 2.86 +/- 0.8 ** Pass NA Water - MCWA 1/3/2022 Gross Beta pCi/L 1.64 +/- 0.8 2.11 +/- 0.8 ** Pass NA Water - Webster 1/3/2022 Gross Beta pCi/L 1.33 +/- 0.7 1.75 +/- 0.7 ** Pass NA Water - DC 1/12/2022 Gross Beta pCi/L 2.61 +/- 1.9 4.48 +/- 1.9 ** Pass NA Water - ML 1/12/2022 Gross Beta pCi/L 4.74 +/- 4.1 4.96 +/- 4.1 ** Pass NA Water - Circ in 10/10/2022 Gross Beta pCi/L 2.64 +/- 0.8 3.48 +/- 0.8 ** Pass NA Water - Circ Out 10/10/2022 Gross Beta pCi/L 2.07 +/- 0.8 2.41 +/- 0.8 ** Pass NA Water - OWD 10/10/2022 Gross Beta pCi/L 1.88 +/- 0.7 2.61 +/- 0.8 ** Pass NA Water - MCWA 10/10/2022 Gross Beta pCi/L 1.82 +/- 0.7 1.74 +/- 0.7 ** Pass NA Water - Webster 10/10/2022 Gross Beta pCi/L 2.23 +/- 0.8 2.36 +/- 0.8 ** Pass NA Water - DC 10/31/2022 Gross Beta pCi/L 5.35 +/- 2.0 8.89 +/- 2.3 ** Pass NA Water - ML 10/31/2022 Gross Beta pCi/L 8.19 +/- 2.2 8.58 +/- 2.2 ** Pass NA Water - 16C2 1/31/2022 Gross Beta pCi/L 2.6 +/- 0.8 NA <2.5 NA Pass Water - 16C2 1/31/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 1/31/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 2/28/2022 Gross Beta pCi/L 2.7 +/- 0.9 NA <3.3 NA Pass Water - 16C2 2/28/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 2/28/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 3/29/2022 Gross Beta pCi/L 2.1 +/- 0.8 NA 3.24 +/- 1.7 NA Pass Water - 16C2 3/29/2022 LLI pCi/L <MDA NA <MDA NA Pass 72

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Water - 16C2 3/29/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 3/29/2022 Tritium pCi/L <123 NA <194 NA Pass Water - 16C2 5/2/2022 Gross Beta pCi/L 1.6 +/- 0.8 NA <2.8 NA Pass Water - 16C2 5/2/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 5/2/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 5/31/2022 Gross Beta pCi/L 1.8 +/- 0.8 NA <3.3 NA Pass Water - 16C2 5/31/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 5/31/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 6/27/2022 Gross Beta pCi/L 5.1 +/- 1.0 NA <3.0 NA Pass Water - 16C2 6/27/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 6/27/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 6/27/2022 Tritium pCi/L <164 NA <182 NA Pass Water - 16C2 8/2/2022 Gross Beta pCi/L 2.7 +/- 1.6 NA <1.8 NA Pass Water - 16C2 8/2/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 8/2/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 8/29/2022 Gross Beta pCi/L 3.4 +/- 0.7 NA <3.1 NA Pass Water - 16C2 8/29/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 8/29/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 10/3/2022 Gross Beta pCi/L 1.8 +/- 0.8 NA <3.1 NA Pass Water - 16C2 10/3/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 10/3/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 10/3/2022 Tritium pCi/L <163 NA <188 NA Pass Water - 16C2 10/31/2022 Gross Beta pCi/L 2.0 +/- 0.8 NA 3.22 +/- 1.8 NA Pass Water - 16C2 10/31/2022 LLI pCi/L <MDA NA <MDA NA Pass 73

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Water - 16C2 10/31/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 11/29/2022 Gross Beta pCi/L 1.8 +/- 0.8 NA <2.7 NA Pass Water - 16C2 11/29/2022 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 11/29/2022 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 1/3/2023 Gross Beta pCi/L 2.4 +/- 0.8 NA <3.0 NA Pass Water - 16C2 1/3/2023 LLI pCi/L <MDA NA <MDA NA Pass Water - 16C2 1/3/2023 Gamma pCi/L <MDA NA <MDA NA Pass Water - 16C2 1/3/2023 Tritium pCi/L <156 NA <178 NA Pass Milk- 19B1 1/18/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 19B1 1/18/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 25C1 1/18/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 25C1 1/18/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 19B1 4/11/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 19B1 4/11/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 25C1 4/11/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 25C1 4/11/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 19B1 7/5/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 19B1 7/5/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 19B1 10/11/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 19B1 10/11/2022 Gamma pCi/L <MDA NA <MDA NA Pass Milk- 22B1 12/6/2022 LLI pCi/L <MDA NA <MDA NA Pass Milk- 22B1 12/6/2022 Gamma pCi/L <MDA NA <MDA NA Pass Composite- 11S1 3/29/2022 Gamma pCi/m3 11S1 <MDA NA 11S2 <MDA NA Pass Composite- 11S1 6/27/2022 Gamma pCi/m3 11S1 <MDA NA 11S2 <MDA NA Pass 74

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Composite- 11S1 10/3/2022 Gamma pCi/m3 11S1 <MDA NA 11S2 <MDA NA Pass Composite- 11S1 1/3/2023 Gamma pCi/m3 11S1 <MDA NA 11S2 <MDA NA Pass Air Filter - A1 1/10/2022 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.8 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - A1 4/18/2022 Gross Beta 10 pCi/m 1.6 0.1 1.6 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - A1 4/25/2022 Gross Beta 10 pCi/m 1.8 0.1 1.8 +/- 0.1 NA Air Filter - A1 5/2/2022 Gross Beta 10-2 pCi/m3 2.4 +/- 0.1 2.3 +/- 0.1 ** Pass NA Air Filter - A1 6/6/2022 Gross Beta 10-2 pCi/m3 2.3 +/- 0.1 2.2 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - A1 8/29/2022 Gross Beta 10 pCi/m 3.4 0.1 3.3 +/- 0.2 NA

-2 3 +/- ** Pass Air Filter - A1 10/31/2022 Gross Beta 10 pCi/m 1.1 0.1 1.3 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - A1 11/15/2022 Gross Beta 10 pCi/m 1.5 0.1 1.6 +/- 0.1 NA Air Filter - A2 1/10/2022 Gross Beta 10-2 pCi/m3 2.4 +/- 0.2 2.4 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - A2 4/18/2022 Gross Beta 10 pCi/m 1.4 0.1 1.3 +/- 0.1 NA

-2 3 Air Filter - A2 4/25/2022 Gross Beta 10 pCi/m 1.6 +/- 0.1 1.6 +/- 0.1 ** Pass NA

-2 3 Air Filter - A2 5/2/2022 Gross Beta 10 pCi/m 2.2 +/- 0.2 2.0 +/- 0.1 ** Pass NA

-2 3 Air Filter - A2 6/6/2022 Gross Beta 10 pCi/m 1.7 +/- 0.1 1.7 +/- 0.1 ** Pass NA Air Filter - A2 8/29/2022 Gross Beta 10-2 pCi/m3 3.0 +/- 0.1 3.0 +/- 0.2 ** Pass NA Air Filter - A2 10/31/2022 Gross Beta 10-2 pCi/m3 1.1 +/- 0.1 1.2 +/- 0.1 ** Pass NA

-2 3 Air Filter - A2 11/15/2022 Gross Beta 10 pCi/m 1.5 +/- 0.1 1.6 +/- 0.1 ** Pass NA Air Filter - A3 1/10/2022 Gross Beta 10-2 pCi/m3 3.1 +/- 0.2 2.9 +/- 0.2 ** Pass NA

-2 3 Air Filter - A3 4/18/2022 Gross Beta 10 pCi/m 1.5 +/- 0.1 1.5 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - A3 4/25/2022 Gross Beta 10 pCi/m 1.8 0.1 1.8 +/- 0.1 NA

-2 3 Air Filter - A3 5/2/2022 Gross Beta 10 pCi/m 2.6 +/- 0.1 2.1 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - A3 6/6/2022 Gross Beta 10 pCi/m 2.3 0.1 2.3 +/- 0.2 NA

-2 3 +/- ** Pass Air Filter - A3 8/29/2022 Gross Beta 10 pCi/m 3.6 0.1 3.5 +/- 0.2 NA

-2 3 Air Filter - A3 10/31/2022 Gross Beta 10 pCi/m 1.0 +/- 0.1 1.0 +/- 0.1 ** Pass NA Air Filter - A3 11/15/2022 Gross Beta 10-2 pCi/m3 1.5 +/- 0.1 1.6 +/- 0.1 ** Pass NA 75

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Filter - A4 1/10/2022 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.9 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - A4 4/18/2022 Gross Beta 10 pCi/m 1.5 0.1 1.5 +/- 0.1 NA

-2 3 Air Filter - A4 4/25/2022 Gross Beta 10 pCi/m 1.8 +/- 0.1 1.9 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - A4 5/2/2022 Gross Beta 10 pCi/m 2.4 0.1 2.2 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - A4 6/6/2022 Gross Beta 10 pCi/m 2.3 0.1 2.3 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - A4 8/29/2022 Gross Beta 10 pCi/m 3.6 0.1 3.8 +/- 0.2 NA

-2 3 +/- ** Pass Air Filter - A4 10/31/2022 Gross Beta 10 pCi/m 1.2 0.1 1.3 +/- 0.1 NA Air Filter - A4 11/15/2022 Gross Beta 10-2 pCi/m3 1.6 +/- 0.1 1.8 +/- 0.1 ** Pass NA Air Filter - A5 1/10/2022 Gross Beta 10-2 pCi/m3 2.8 +/- 0.2 2.8 +/- 0.2 ** Pass NA Air Filter - A5 4/18/2022 Gross Beta 10-2 pCi/m3 1.4 +/- 0.1 1.4 +/- 0.1 ** Pass NA Air Filter - A5 4/25/2022 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.8 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - A5 5/2/2022 Gross Beta 10 pCi/m 2.6 0.2 2.2 +/- 0.1 NA

-2 3 Air Filter - A5 6/6/2022 Gross Beta 10 pCi/m 2.2 +/- 0.1 2.3 +/- 0.2 ** Pass NA

-2 3 Air Filter - A5 8/29/2022 Gross Beta 10 pCi/m 3.9 +/- 0.1 3.9 +/- 0.2 ** Pass NA

-2 3 Air Filter - A5 10/31/2022 Gross Beta 10 pCi/m 1.2 +/- 0.1 1.3 +/- 0.1 ** Pass NA

-2 3 Air Filter - A5 11/15/2022 Gross Beta 10 pCi/m 1.7 +/- 0.1 1.8 +/- 0.1 ** Pass NA Air Filter - SFA1 1/10/2022 Gross Beta 10-2 pCi/m3 3.1 +/- 0.2 3.0 +/- 0.2 ** Pass NA

-2 3 Air Filter - SFA1 4/18/2022 Gross Beta 10 pCi/m 1.4 +/- 0.1 1.5 +/- 0.1 ** Pass NA

-2 3 Air Filter - SFA1 4/25/2022 Gross Beta 10 pCi/m 1.6 +/- 0.1 1.7 +/- 0.1 ** Pass NA Air Filter - SFA1 5/2/2022 Gross Beta 10-2 pCi/m3 2.2 +/- 0.1 2.2 +/- 0.1 ** Pass NA Air Filter - SFA1 6/6/2022 Gross Beta 10-2 pCi/m3 2.2 +/- 0.1 2.0 +/- 0.2 ** Pass NA

-2 3 Air Filter - SFA1 8/29/2022 Gross Beta 10 pCi/m 3.2 +/- 0.1 3.2 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA1 10/31/2022 Gross Beta 10 pCi/m 1.0 0.1 1.1 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - SFA1 11/15/2022 Gross Beta 10 pCi/m 1.5 0.1 1.6 +/- 0.1 NA 76

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Filter - SFA2 1/10/2022 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.8 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA2 4/18/2022 Gross Beta 10 pCi/m 1.6 0.1 1.6 +/- 0.1 NA

-2 3 +/- ** Pass Air Filter - SFA2 4/25/2022 Gross Beta 10 pCi/m 1.8 0.1 1.8 +/- 0.1 NA

-2 3 Air Filter - SFA2 5/2/2022 Gross Beta 10 pCi/m 2.2 +/- 0.1 2.4 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA2 6/6/2022 Gross Beta 10 pCi/m 2.4 0.1 2.4 +/- 0.1 NA Air Filter - SFA2 8/29/2022 Gross Beta 10-2 pCi/m3 3.3 +/- 0.1 3.4 +/- 0.2 ** Pass NA Air Filter - SFA2 10/31/2022 Gross Beta 10-2 pCi/m3 1.0 +/- 0.1 1.0 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA2 11/15/2022 Gross Beta 10 pCi/m 1.5 0.1 1.6 +/- 0.1 NA Air Filter - SFA3 1/10/2022 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 3.0 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA3 4/18/2022 Gross Beta 10 pCi/m 1.5 0.1 1.4 +/- 0.1 NA

-2 3 Air Filter - SFA3 4/25/2022 Gross Beta 10 pCi/m 1.6 +/- 0.1 1.7 +/- 0.1 ** Pass NA

-2 3 Air Filter - SFA3 5/2/2022 Gross Beta 10 pCi/m 2.3 +/- 0.1 2.1 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA3 6/6/2022 Gross Beta 10 pCi/m 2.4 0.1 2.2 +/- 0.2 NA

-2 3 Air Filter - SFA3 8/29/2022 Gross Beta 10 pCi/m 3.5 +/- 0.1 3.3 +/- 0.2 ** Pass NA

-2 3 Air Filter - SFA3 10/31/2022 Gross Beta 10 pCi/m 0.9 +/- 0.1 1.1 +/- 0.1 ** Pass NA Air Filter - SFA3 11/15/2022 Gross Beta 10-2 pCi/m3 1.2 +/- 0.1 1.5 +/- 0.1 ** Pass NA Air Filter - SFA4 1/10/2022 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.8 +/- 0.2 ** Pass NA Air Filter - SFA4 4/18/2022 Gross Beta 10-2 pCi/m3 1.4 +/- 0.1 1.4 +/- 0.1 ** Pass NA Air Filter - SFA4 4/25/2022 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.7 +/- 0.1 ** Pass NA

-2 3 Air Filter - SFA4 5/2/2022 Gross Beta 10 pCi/m 2.2 +/- 0.1 2.0 +/- 0.1 ** Pass NA

-2 3 +/- ** Pass Air Filter - SFA4 6/6/2022 Gross Beta 10 pCi/m 2.0 0.1 2.1 +/- 0.1 NA

-2 3 Air Filter - SFA4 10/31/2022 Gross Beta 10 pCi/m 0.9 +/- 0.1 1.1 +/- 0.1 ** Pass NA

-2 3 Air Filter - SFA4 11/15/2022 Gross Beta 10 pCi/m 1.3 +/- 0.1 1.5 +/- 0.1 ** Pass NA Air Filter - STATION-02 4/18/2022 Gross Beta 10-2 pCi/m3 3.0 +/- 0.1 3.1 +/- 0.1 ** Pass NA

-2 3 Air Filter - STATION-03 4/18/2022 Gross Beta 10 pCi/m 3.0 +/- 0.2 3.1 +/- 0.1 ** Pass NA

-2 3 Air Filter - STATION-04 4/18/2022 Gross Beta 10 pCi/m 3.4 +/- 0.3 3.2 +/- 0.3 ** Pass NA 77

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Filter - STATION-05 4/18/2022 Gross Beta 10-2 pCi/m3 3.4 +/- 0.2 3.4 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - STATION-06 4/18/2022 Gross Beta 10 pCi/m 3.3 0.2 3.4 +/- 0.2 NA

-2 3 +/- ** Pass Air Filter - STATION-07 4/18/2022 Gross Beta 10 pCi/m 3.6 0.2 3.6 +/- 0.2 NA

-2 3 Air Filter - STATION-08 4/19/2022 Gross Beta 10 pCi/m 3.0 +/- 0.2 3.3 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - STATION-09 4/19/2022 Gross Beta 10 pCi/m 3.4 0.2 3.2 +/- 0.2 NA Air Filter - STATION-10 4/19/2022 Gross Beta 10-2 pCi/m3 3.5 +/- 0.2 3.5 +/- 0.2 ** Pass NA Air Filter - STATION-11 4/19/2022 Gross Beta 10-2 pCi/m3 3.4 +/- 0.2 3.2 +/- 0.2 ** Pass NA

-2 3 +/- ** Pass Air Filter - STATION-12 4/19/2022 Gross Beta 10 pCi/m 3.3 0.2 3.4 +/- 0.2 NA

-2 3 +/- ** Pass Air Filter - STATION-13 4/19/2022 Gross Beta 10 pCi/m 3.4 0.2 3.4 +/- 0.2 NA Air Iodine - A1 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 1/18/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 2/15/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA 78

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Iodine - A1 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 5/9/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 8/1/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 9/6/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA 79

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Iodine - STATION-02 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-04 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-07 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-08 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-09 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-11 10/4/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 10/24/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-02 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-04 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-07 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA 80

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Air Iodine - STATION-08 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-09 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - STATION-11 12/19/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A1 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A2 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A3 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A4 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - A5 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA1 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA2 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA3 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Air Iodine - SFA4 12/27/2022 I-131 pCi/m3 <MDA <MDA ** Pass NA Soil- SFS31 2/21/2022 Gamma pCi/kg 146 +/- 61.9 212 +/- 67.5 141 +/- 83.0 Pass Pass Soil- SFS3 6/6/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Soil- SFS5 6/6/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Sediment- WBS2 6/21/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Air Filter - A1 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - A2 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - A3 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - A4 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - A5 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - SFA1 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - SFA2 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - SFA3 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Air Filter - SFA4 6/27/2022 Gamma pCi/m3 <MDA <MDA <MDA Pass Pass Cabbage- IB8 6/27/2022 Gamma pCi/kg <MDA <MDA NA Pass NA 81

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Water- WA1 7/1/2022 Gamma pCi/L <MDA <MDA NA Pass NA Water- WA2 7/1/2022 Gamma pCi/L <MDA <MDA NA Pass NA Cabbage- IB4 7/25/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Tomato- EAST 7/28/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Zucchini- SSE 7/28/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Zucchini- EAST 7/28/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Water- WA1 7/29/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Water- WA2 7/29/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Fish- IA1 8/24/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Oysters- IA3 8/24/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Collards- IB4 9/19/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Kale- IB5 9/19/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Water- WA1 9/30/2022 Gamma pCi/L <MDA <MDA NA Pass NA Water- WA2 9/30/2022 Gamma pCi/L <MDA <MDA NA Pass NA Sediment- WB1 10/3/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Milk- Farm A 10/5/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm B 10/3/2022 Gamma pCi/L <MDA <MDA NA Pass NA Oysters- IA3 10/11/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Oysters- IA6 10/11/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Vegetation- SFB1 11/15/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Vegetation- SFB5 11/15/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass 82

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Fish- NORTH 11/15/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Fish- WEST 11/15/2022 Gamma pCi/kg <MDA <MDA <MDA Pass Pass Soil- SFS31 11/15/2022 Gamma pCi/kg 133 +/- 55.3 169 +/- 61.3 NA Pass NA Soil- SFS1 11/15/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Soil- SFS2 11/15/2022 Gamma pCi/kg <MDA <MDA NA Pass NA Milk- 18E1 11/22/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- 19B1 11/22/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- G2-1Q 11/23/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm A 11/28/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm B 11/28/2022 Gamma pCi/L <MDA <MDA NA Pass NA Water- WA1 11/29/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Water- WA2 11/29/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Water- 4L 11/30/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Water- Q9-1 11/30/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm J 12/6/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm S 12/6/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- Farm V 12/7/2022 Gamma pCi/L <MDA <MDA NA Pass NA Milk- G2-1Q 12/7/2022 Gamma pCi/L <MDA <MDA NA Pass NA Water- 4L 12/29/2022 Gamma pCi/L <MDA <MDA <MDA Pass Pass Water- WA1 12/29/2022 Gamma pCi/L <MDA <MDA NA Pass NA Water- WA2 12/29/2022 Gamma pCi/L <MDA <MDA NA Pass NA 1

See discussion at the beginning of the Appendix

- The nature of these samples precluded splitting them with an independent laboratory.

83

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-2a Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Isotope 11S1 11S2 Start Date Stop Date Observed Analysis Analysis 1/3/2022 1/10/2022 I-131 <MDA <MDA 1/10/2022 1/18/2022 I-131 <MDA <MDA 1/18/2022 1/24/2022 I-131 <MDA <MDA 1/24/2022 1/31/2022 I-131 <MDA <MDA 1/31/2022 2/7/2022 I-131 <MDA <MDA 2/7/2022 2/14/2022 I-131 <MDA <MDA 2/14/2022 2/21/2022 I-131 <MDA <MDA 2/21/2022 2/28/2022 I-131 <MDA <MDA 2/28/2022 3/7/2022 I-131 <MDA <MDA 3/7/2022 3/14/2022 I-131 <MDA <MDA 3/14/2022 3/21/2022 I-131 <MDA <MDA 3/21/2022 3/29/2022 I-131 <MDA <MDA 3/29/2022 4/4/2022 I-131 <MDA <MDA 4/4/2022 4/11/2022 I-131 <MDA <MDA 4/11/2022 4/18/2022 I-131 <MDA <MDA 4/18/2022 4/25/2022 I-131 <MDA <MDA 4/25/2022 5/2/2022 I-131 <MDA <MDA 5/2/2022 5/9/2022 I-131 <MDA <MDA 84

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-2a Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Isotope 11S1 11S2 Start Date Stop Date Observed Analysis Analysis 5/9/2022 5/16/2022 I-131 <MDA <MDA 5/16/2022 5/23/2022 I-131 <MDA <MDA 5/23/2022 5/31/2022 I-131 <MDA <MDA 5/31/2022 6/6/2022 I-131 <MDA <MDA 6/6/2022 6/13/2022 I-131 <MDA <MDA 6/13/2022 6/20/2022 I-131 <MDA <MDA 6/20/2022 6/27/2022 I-131 <MDA <MDA 6/27/2022 7/5/2022 I-131 <MDA <MDA 7/5/2022 7/11/2022 I-131 <MDA <MDA 7/11/2022 7/18/2022 I-131 <MDA <MDA 7/18/2022 7/25/2022 I-131 <MDA <MDA 7/25/2022 8/2/2022 I-131 <MDA <MDA 8/2/2022 8/8/2022 I-131 <MDA <MDA 8/8/2022 8/15/2022 I-131 <MDA <MDA 8/15/2022 8/22/2022 I-131 <MDA <MDA 8/22/2022 8/29/2022 I-131 <MDA <MDA 8/29/2022 9/6/2022 I-131 <MDA <MDA 9/6/2022 9/12/2022 I-131 <MDA <MDA 85

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-2a Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Isotope 11S1 11S2 Start Date Stop Date Observed Analysis Analysis 9/12/2022 9/19/2022 I-131 <MDA <MDA 9/19/2022 9/26/2022 I-131 <MDA <MDA 9/26/2022 10/3/2022 I-131 <MDA <MDA 10/3/2022 10/10/2022 I-131 <MDA <MDA 10/10/2022 10/17/2022 I-131 <MDA <MDA 10/17/2022 10/24/2022 I-131 <MDA <MDA 10/24/2022 10/31/2022 I-131 <MDA <MDA 10/31/2022 11/7/2022 I-131 <MDA <MDA 11/7/2022 11/14/2022 I-131 <MDA <MDA 11/14/2022 11/22/2022 I-131 <MDA <MDA 11/22/2022 11/29/2022 I-131 <MDA <MDA 11/29/2022 12/5/2022 I-131 <MDA <MDA 12/5/2022 12/12/2022 I-131 <MDA <MDA 12/12/2022 12/19/2022 I-131 <MDA <MDA 12/19/2022 12/27/2022 I-131 <MDA <MDA 12/27/2022 1/3/2023 I-131 <MDA <MDA

86

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table C-2b Results of Quality Assurance Program Co-Located Air Samplers 11S1 and 11S2 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date 11S1 11S2 1/3/2022 1/10/2022 2.6 +/- 0.2 3.0 +/- 0.5 1/10/2022 1/18/2022 2.0 +/- 0.2 2.5 +/- 0.4 1/18/2022 1/24/2022 2.8 +/- 0.3 1.8 +/- 0.5 1/24/2022 1/31/2022 2.5 +/- 0.2 1.9 +/- 0.4 1/31/2022 2/7/2022 1.9 +/- 0.2 1.7 +/- 0.4 2/7/2022 2/14/2022 2.2 +/- 0.2 2.2 +/- 0.4 2/14/2022 2/21/2022 1.9 +/- 0.2 1.7 +/- 0.4 2/21/2022 2/28/2022 2.1 +/- 0.2 2.3 +/- 0.4 2/28/2022 3/7/2022 2.4 +/- 0.2 2.0 +/- 0.4 3/7/2022 3/14/2022 1.3 +/- 0.2 1.2 +/- 0.4 3/14/2022 3/21/2022 2.2 +/- 0.2 1.7 +/- 0.4 3/21/2022 3/29/2022 0.9 +/- 0.2 0.8 +/- 0.3 3/29/2022 4/4/2022 1.5 +/- 0.2 0.7 +/- 0.4 4/4/2022 4/11/2022 0.8 +/- 0.2 0.6 +/- 0.3 4/11/2022 4/18/2022 1.3 +/- 0.2 1.2 +/- 0.4 4/18/2022 4/25/2022 1.6 +/- 0.2 1.2 +/- 0.4 4/25/2022 5/2/2022 2.0 +/- 0.2 1.7 +/- 0.4 5/2/2022 5/9/2022 1.3 +/- 0.2 0.8 +/- 0.3 5/9/2022 5/16/2022 1.1 +/- 0.2 1.2 +/- 0.3 5/16/2022 5/23/2022 1.8 +/- 0.2 1.0 +/- 0.4 5/23/2022 5/31/2022 1.1 +/- 0.2 0.8 +/- 0.3 5/31/2022 6/6/2022 1.8 +/- 0.2 1.5 +/- 0.5 6/6/2022 6/13/2022 1.5 +/- 0.2 0.9 +/- 0.4 6/13/2022 6/20/2022 1.2 +/- 0.2 1.2 +/- 0.4 6/20/2022 6/27/2022 1.9 +/- 0.1 0.9 +/- 0.5

87

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Start Date Stop Date 11S1 11S2 6/27/2022 7/5/2022 1.8 +/- 0.2 1.0 +/- 0.3 7/5/2022 7/11/2022 1.8 +/- 0.2 1.6 +/- 0.4 7/11/2022 7/18/2022 1.9 +/- 0.2 1.3 +/- 0.4 7/18/2022 7/25/2022 2.8 +/- 0.2 1.9 +/- 0.5 7/25/2022 8/2/2022 2.0 +/- 0.3 1.6 +/- 0.4 8/2/2022 8/8/2022 2.4 +/- 0.2 1.5 +/- 0.4 8/8/2022 8/15/2022 1.8 +/- 0.3 1.2 +/- 0.4 8/15/2022 8/22/2022 2.3 +/- 0.2 1.9 +/- 0.4 8/22/2022 8/29/2022 2.8 +/- 0.2 2.4 +/- 0.5 8/29/2022 9/6/2022 2.1 +/- 0.2 2.1 +/- 0.4 9/6/2022 9/12/2022 1.7 +/- 0.3 1.2 +/- 0.4 9/12/2022 9/19/2022 2.1 +/- 0.2 2.0 +/- 0.4 9/19/2022 9/26/2022 2.6 +/- 0.2 2.1 +/- 0.4 9/26/2022 10/3/2022 1.4 +/- 0.2 1.3 +/- 0.4 10/3/2022 10/10/2022 1.7 +/- 0.2 1.5 +/- 0.4 10/10/2022 10/17/2022 3.0 +/- 0.3 2.7 +/- 0.5 10/17/2022 10/24/2022 2.5 +/- 0.2 2.0 +/- 0.4 10/24/2022 10/31/2022 1.4 +/- 0.2 0.9 +/- 0.4 10/31/2022 11/7/2022 2.6 +/- 0.2 2.0 +/- 0.4 11/7/2022 11/14/2022 2.0 +/- 0.2 1.4 +/- 0.4 11/14/2022 11/22/2022 2.4 +/- 0.2 1.8 +/- 0.4 11/22/2022 11/29/2022 3.9 +/- 0.3 2.2 +/- 0.4 11/29/2022 12/5/2022 2.7 +/- 0.3 2.1 +/- 0.4 12/5/2022 12/12/2022 2.6 +/- 0.2 2.0 +/- 0.4 12/12/2022 12/19/2022 1.9 +/- 0.2 1.3 +/- 0.4 12/19/2022 12/27/2022 2.6 +/- 0.2 2.0 +/- 0.4 12/27/2022 1/3/2023 3.5 +/- 0.2 2.2 +/- 0.4 1

See Appendix C Summary 88

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE C-3 Limerick Generating Station ODCM Required LLDs Selected Water Fish/Shellfish Milk Sediment Vegetation Particulates1 Nuclides pCi/l pCi/kg pCi/L pCi/kg pCi/kg pCi/m3 H-3 2000 -- -- -- -- --

Mn-54 15 130 -- -- -- --

Co-58 15 130 -- -- -- --

Fe-59 30 260 -- -- -- --

Co-60 15 130 -- -- -- --

Zn-65 30 260 -- -- -- --

Zr-95/Nb-95 15 -- -- -- -- --

I-131 15 -- 1 -- 60 0.072 Cs-134 15 130 15 150 60 0.05 Cs-137 18 150 18 180 80 0.06 Ba-140 60 -- 60 -- -- --

La-140 15 -- 15 -- -- --

1 Gross Beta activity LLD = 0.01pCi/m3 2

Air samples for I-131 are collected separately on a charcoal radioiodine cannister 89

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 APPENDIX D Land Use Survey Appendix D contains the results of a Land Use Survey conducted in the fall of 2022 around Limerick Generating Station (LGS), performed by Constellation Generation Solutions to comply with Bases 3.3.2 of the Limerick Offsite Dose Calculation Manual. The purpose of the land use survey is to look for all potential pathways of radiation to a person. This is accomplished by documenting the nearest resident, milk- producing animal and garden of greater than 500 ft2 in each of the sixteen 22 1/2 degree sectors out to five miles around the site. The distance and direction of all locations from the LGS reactor buildings were positioned using Global Positioning System (GPS) technology.

The 2022 Land Use Survey identified differences in locations for gardens and meat animals between 2021 and 2022. Twelve (12) new gardens were located this year in meteorological sectors N, NNE, NE, E, ESE, S, SW, and NW. Gardens planted in sectors ESE and SE that are maintained for the REMP program were not included in the survey because of location on LGS property.

These REMP program gardens are used as the sample locations for the REMP program. A new garden observed in the NNE sector was identified as the closest in the sector. The nearest gardens in all other sectors reported in the 2022 report are the same as last years report.

There were ten (10) new meat sites identified this year in N, NNE, NE, ENE, ESE, S, and WSW sectors. All other locations were the same as in the 2021 report. The new locations in the NNE, NE, ENE, and S were identified as the closest meat animals in that sector. There were no changes required to the LGS REMP as a result of this survey. There was no observed water usage for agricultural irrigation of root vegetables drawn directly from the Schuylkill River downriver from Limerick Generation Station. The results of this survey are summarized in Table D-1

90

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table D-1 Distance of the Nearest Residence, Garden, Dairy, Meat Animal within a Five Mile Radius of Limerick Generating Station (Distance in feet) 2022 Sector Residence Garden (1) Dairy Animal Meat Animal N 3,109 3,333 24,775* 10,077 NNE 2,706 3,792 - 3,792 NE 3,469 13,917 - 3,469 ENE 3,231 8,241 - 4,070 E 2,864 4,117 - 3,890 ESE 3,434 3,434 - 12,264 SE 3,928 6,376 - 10,903 SSE 5,403 6,912 - 8,177 S 4,347 6,103 22,114* 9,933 SSW 5,063 5,732 10,390* 7,729 SW 3,251 6,319 20,011* 23,145 WSW 3,799 4,507 14,177* 4,084 W 3,627 8,886 - 14,123 WNW 3,685 12,022 - -

NW 3,619 8,200 - -

NNW 5,050 6,473 - 12,065

Denotes current REMP Dairy sample location 91

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure D-1 Limerick Generating Station Land Use Census

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Garden ~ Limerick Generating Station Meat NORMANDEAU Land Use 2021 0 ASSOCIATES Dairy/Milk 0.5 2Miles Date: Revised: 400 Old Reading Pike Bldg A Suite 101 Stowe, PA 19464 01 /03/2022 Prepared For: RB Project: 24407.004 Prepared By: SAS Path: J:\Projecls\LGS_ REMP _205731202 1\MXD\LGS_LandUse_010322 .mxd 92

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 APPENDIX E Annual Radiological Groundwater Protection Program Report For Limerick Generating Station This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Limerick Generating Station (LGS) by Constellation Nuclear covers the period January 1, 2022 through December 31, 2022. During that time period,85 analyses were performed on 41 samples from 13 groundwater locations and 20 analyses were performed on 12 precipitation water locations collected from the environment, both on and off station property in 2022.

Groundwater samples were analyzed for tritium. Low levels of tritium were detected at 4 of the 13 groundwater monitoring locations. All other results were less than the required Constellation-specified LLD of 200 pCi/L.

Groundwater samples were analyzed for strontium-89 (Sr-89) and strontium-90 (Sr-90). All Sr-89 and Sr-90 results were less than the MDC.

Hard-To-Detect (HTD) analyses are routinely performed on a once per five year frequency for all groundwater monitoring locations. HTD analyses were performed in 2021 for 7 samples. All HTD results were less than the MDC. HTD analyses will be performed again in 2026.

Precipitation water samples were analyzed for tritium. Tritium was detected at 6 of 12 precipitation locations sampled.

In assessing all the data gathered for this report, it was concluded that the operation of Limerick Generating Station had no adverse radiological impact on the environment offsite of LGS. Additionally, there does not appear to be an active source of tritium to groundwater at the Station.

93

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 II. Introduction The Limerick Generating Station (LGS), consisting of two 3515 MW boiling water reactors owned and operated by Constellation Corporation, is located adjacent to the Schuylkill River in Montgomery County, Pennsylvania. Unit No. 1 went critical on December 22, 1984. Unit No. 2 went critical on August 11, 1989.

The site is located in Piedmont countryside, transversed by numerous valleys containing small tributaries that feed into the Schuylkill River. On the eastern riverbank elevation rises from approximately 110 to 300 feet mean sea level (MSL).

On the western riverbank elevation rises to approximately 50 feet MSL.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2022 and analysis for replicate samples performed by GEL Laboratories.

In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of Limerick Generating Station. This evaluation involved numerous station personnel and contractor support personnel.

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

1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.

2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.

3. Perform routine water sampling and radiological analysis of water from selected locations.

4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.

5. Regularly assess analytical results to identify adverse trends.

6. Take necessary corrective actions to protect groundwater resources.

94

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 B. Implementation of the Objectives The objectives identified have been implemented at Limerick Generating Station as discussed below:

1. Exelon and its consultant identified locations as described in the 2006 Phase 1 study. The Phase 1 study results and conclusions were made available to state and federal regulators in station specific reports.

2. The Limerick Generating Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3. Limerick Generating Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. Limerick Generating Station has procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5. Limerick Generating Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C. Program Description Samples for the ongoing ground water monitoring program were collected by Constellation Generation Solutions (CGS). This section describes the general collection methods used to obtain environmental samples for the LGS RGPP in 2021. Sample locations can be found in Table E-1, Appendix E.

1. Sample Collection Groundwater Samples of groundwater were collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Sample locations, sample collection frequencies and analytical frequencies were controlled in accordance with approved station procedures. Contractor and/or station personnel were trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events.

Analytical laboratories were subject to internal quality assurance programs, industry cross- check programs, as well as nuclear industry audits. Station personnel reviewed and evaluated all analytical data deliverables as data were received. Both station personnel and an independent hydrogeologist reviewed 95

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 analytical data results for adverse trends or changes to hydrogeological conditions.

Precipitation A five-gallon precipitation collection bucket fitted with a funnel was installed at four locations around the Limerick Generating Station. Three collection buckets were located on site in the highest prevalent wind sectors and one located on site in the least prevalent wind sector.

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water."

The chemical properties of tritium are essentially those of ordinary hydrogen.

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

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

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

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

96

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 III. Program Description A. Sample Analysis This section lists the analyses performed by TBE and GEL Laboratories, LLC (GEL) on environmental samples for the LGS RGPP in 2022. The analytical procedures used by the laboratories are listed in the AREOR References.

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

1. Concentrations of tritium in groundwater and precipitation water

2. Concentrations of gross alpha (dissolved and suspended) in groundwater

3. Concentrations of gamma-emitters (Be-7, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140, and La-140) in groundwater

4. Concentrations of strontium (Sr-89 and Sr-90) in groundwater B. Data Interpretation The radiological data collected prior to Limerick Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Limerick Generating Station was considered operational at initial criticality. Several factors were important in the interpretation of the data:

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

The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an after the fact estimate of the presence of activity.

97

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353

2. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95%

level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Constellation reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated.

Constellation reports the TPU by following the result with plus or minus (+/-)

the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.

C. Background Analysis A pre-operational radiological environmental monitoring program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, aquatic life, and foodstuffs. The results of the monitoring were detailed in the report entitled Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation.

The pre-operational REMP contained analytical results from samples collected from both surface water and groundwater.

Monthly surface water sampling began in 1982, and the samples were analyzed for tritium as well as other radioactive analytes. During the preoperational program tritium was detected at a maximum concentration of 420 pCi/L, indicating that these preoperational results were from nuclear weapons testing and is radioactively decaying as predicted. Gamma isotopic results from the preoperational program were all less than or at the minimum detectable concentration (MDC) level.

98

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. Additional detail may be found by consulting references.

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

Below ground, lithogenic tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium.

Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

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

b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide since 1960. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations have typically been below 100 pCi/L since approximately 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above.

99

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Water from previous years was naturally captured in groundwater. As a result, some well water sources today are affected by the surface water from the 1960s that contained elevated tritium activity.

c. Surface Water Data Tritium concentrations are routinely measured in the Schuylkill and Delaware Rivers. Pennsylvania surface water data are typically less than 100 pCi/L.

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

70 to 100 pCi/L.

The radioanalytical laboratory is counting tritium results to a Constellation specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 - 240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration. The surface water data ends in 1999 as the USEPA RadNet surface water program was terminated in March 1999.

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

100

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 IV. Results and Discussion A. Groundwater Results Samples were collected from onsite wells throughout the year in accordance with the station Radiological Groundwater Protection Program. Analytical results and anomalies are discussed below:

Tritium Samples from 13 locations were analyzed for tritium activity. (Appendix E, Table E-6) Tritium values ranged from non-detectable to 5710 pCi/L. There is no drinking water pathway available from these groundwater sample locations.

Strontium Samples were analyzed for Sr-89 and Sr-90. All results were below the required LLDs. (Appendix E, Table E-5)

Gross Alpha(dissolved and suspended)

Analyses for gross alpha were performed in 2022. Gross alpha was detected above MDA at 4 locations. (Appendix E, Table E-5b)

Gamma Emitters Analysis for gamma emitting nuclides were performed in 2022. All results were below the required LLDs. (Appendix E, Table E-4).

101

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Hard-To-Detect HTD analyses were performed in 2021 on 7 groundwater locations. There were no detects and all results were below the required LLDs. The next sampling event is scheduled to take place in 2026.

B. Precipitation Sample Results Tritium Tritium activity was detected in 7 of 12 precipitation water locations analyzed. The concentrations ranged from 203 to 1160 pCi/L. These concentrations are consistent with historical values observed.

(Appendix E, Table E-7)

C. Drinking Water Well Survey In April 2019, GHD (formerly Conestoga Rover Associates) conducted a comprehensive database search (PaGWIS) for private and public wells within one mile of the Station. The detailed results of the 2019 well search are presented in Appendix C of the 2019 Hydrogeologic Investigation Report for Limerick Generating Station. In general, the well depths range from 45 to 585 feet below ground surface (bgs), and yield between 2 and 65 gpm. All wells are completed in the Brunswick Formation. In the GHD report, Figure 2.3 presents the approximate locations of the water wells that surround the Station.

A review of the PaGWIS database table reveals the following type and associated number of off-Station wells within the on-mile radius of the Station:

x Domestic = 41 wells (68%)

x Industrial = 5 wells (8%)

x Observation = 9 wells (15%)

x Abandoned = 5 wells (8%)

x Total = 60 wells 102

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 One well was identified at the active quarry, which is approximately 2,000 feet to the northwest of the Station. The PaGWIS database search identifies the quarry well as constructed to a depth of 100 feet bgs, and reportedly yields at least 50,400 gpd (35 gpm). A well inventory included in the Stations USFAR cites the total depth of the quarry supply well as 130 feet bgs, with a yield of 100 gpm, and typical operation of 50 gpm for ten hours a day.

The Station has one potable supply well and one fire water well. The potable supply well is constructed as an open-rock borehole. Groundwater was measured at a depth 102 feet bgs during a well pump replacement in 2014. The pump was placed at a depth of approximately 294 feet bgs. The total well depth and the depth of the steel casing are approximately 310 feet bgs. The well is located approximately 175 feet east of the Reactor Building. The potable supply well is sampled as part of the RGPP and designated as DW-LR-1. In 2022, DW-LR-1 pumped 8,570,500 gallons.

The fire water well is constructed as an open-rock borehole. Groundwater was encountered at 121 feet bgs during a well pump replacement in 2004. The well pump was placed at a depth of approximately 399 feet bgs. The total well depth and the depth of the steel casing are unknown. The well is located approximately 500 feet east of the cooling towers. The well is used in an emergency fire situation and for system testing and flushing. In 2022, 1,257,658 gallons were pumped from the well.

103

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 D. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the Annual Radiological Environmental Operating Report. In addition, the results for interlaboratory comparison RGPP samples are included in the data tables in Appendix E.

E. Leaks, Spills, and Releases There were no spills to ground containing radioactive material in 2022.

F. Trends Low level tritium detections in monitoring well MW-LR-9 are being trended.

G. Investigations Intermittent, low-level tritium detections in monitoring well MW-LR-9 are currently being investigated.

H. Actions Taken

1. Compensatory Actions There have been no station events requiring compensatory actions at the Limerick Generating Station.

2. Installation of Monitoring Wells No new monitoring wells.

3. Actions to Recover/Reverse Plumes No actions were required to recover or reverse groundwater plumes.

104

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 V. References

1. GHD, Inc. Hydrogeologic Investigation Report, Limerick Generating Station, 3146 Sanatoga Road, Pottstown, Pennsylvania, Ref. No. 11189800(1),

December 2019

2. Pre-operational Radiological Environmental Monitoring Program Report, Limerick Generating Station Units 1 and 2, 1 January 1982 through 21 December 1984, Teledyne Isotopes and Radiation Management Corporation

3. 2022 Annual RGPP Monitoring Report Summary of Results and Conclusions, Limerick Generating Station, AMO Environmental Decisions, Pottstown, Pennsylvania, Feb 8, 2023 105

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page E-1 Locations of Onsite Radiological Groundwater Protection Program - Limerick Generating Station, 2022 .......................................................................................................................... 107

E-2 Routine Well Water Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022........................................................................................ 108

E-3 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022........................................................................................ 109

E-4 Gamma Emitters in Groundwater ........................................................................................... 110

E-5a Concentration of Radiostrontium in Groundwater ................................................................ 111 E-5b Concentration of Gross Alpha in Groundwater .................................................................... 111

E-6 Concentration of Tritium in Groundwater 112

E-7 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage............ 113

106

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 TABLE E-1 Locations of Onsite Radiological Groundwater Protection Program Limerick Generating Station, 2022 RGPP Description MW-LR-1 Monitoring Well MW-LR-2 Monitoring Well MW-LR-3 Monitoring Well MW-LR-4 Monitoring Well MW-LR-5 Monitoring Well MW-LR-6 Monitoring Well MW-LR-7 Monitoring Well MW-LR-8 Monitoring Well MW-LR-9 Monitoring Well MW-LR-10 Monitoring Well P3 Monitoring Well P11 Monitoring Well P14 Monitoring Well P17 Monitoring Well DW-LR-1 Monitoring Well 36S3 Precipitation Water E-5 Precipitation Water ESE-6 Precipitation Water RS-1 Precipitation Water RS-2 Precipitation Water RS-3 Precipitation Water RS-4 Precipitation Water RS-5 Precipitation Water RS-6 Precipitation Water RS-7 Precipitation Water RS-8 Precipitation Water SE-7 Precipitation Water 107

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure E-2 Routine Well Water Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022 MW-LR-1 0 400 800 Feet 108

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Figure E-3 Routine Precipitation Sample Locations for the Radiological Groundwater Protection Program, Limerick Generating Station, 2022

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January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table E-4 Gamma Emitters in Groundwater (Results in units of pCi/L +/- 2)

Non Natural Station Sample Date Gamma Emitters MW-LR-4 06/01/2022 <MDA DW-LR-1 06/03/2022 <MDA MW-LR-5 06/01/2022 <MDA MW-LR-5(Dup) 06/01/2022 <MDA MW-LR-5(QA) 06/01/2022 <MDA MW-LR-3 06/01/2022 <MDA MW-LR-2 06/01/2022 <MDA MW-LR-7 06/01/2022 <MDA P17 06/01/2022 <MDA P14 06/03/2022 <MDA MW-LR-10 06/03/2022 <MDA MW-LR-9 06/03/2022 <MDA MW-LR-9(Dup) 06/03/2022 <MDA MW-LR-8 06/03/2022 <MDA P11 06/03/2022 <MDA MW-LR-1 06/01/2022 <MDA 110

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table E-5a Concentration of Radiostrontium in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date SR-89 (pCi/L) SR-90 (pCi/L)

MW-LR-4 06/01/2022 <4.87 <.953 P14 06/03/2022 <9.44 <0.833 MW-LR-10 06/03/2022 <7.93 <.895 MW-LR-9 06/03/2022 <7.98 <.835 MW-LR-9(Dup) 06/03/2022 <7.63 <.903 MW-LR-9(QA) 06/03/2022 <1.54 <.913 MW-LR-8 06/03/2022 <4.27 <0.997 P11 06/03/2022 <6.37 <0.935 MW-LR-1 06/01/2022 <3.77 <0.659 Table E-5b Concentration of Gross Alpha in Groundwater (Results in units of pCi/L +/- 2)

Gross Alpha (pCi/L)

Station Sample Date Dissolved Suspended MW-LR-4 06/01/2022 <1.77 <0.883 MW-LR-10 06/03/2022 2.13 <0.879 P14 06/03/2022 <2.67 <0.903 MW-LR-9 06/03/2022 <2.31 15.0 MW-LR-9(Dup) 06/03/2022 3.58 15.8 MW-LR-9(QA) 06/03/2022 Total Gross Alpha = 64.2+/-14.2 MW-LR-8 06/03/2022 4.02 <0.882 P11 06/03/2022 <1.34 <0.879 MW-LR-1 06/01/2022 1.62 <0.881 111

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table E-6 Concentration of Tritium in Groundwater (Results in units of pCi/L +/- 2)

LOCATION 1/26/2022 2/28/2022 3/30/2022 4/22/2022 6/1/2022 6/3/2022 6/29/2022 7/26/2022 8/30/2022 9/27/2022 10/25/2022 11/29/2022 12/19/2022 DW-LR-1 <173 ND ND ND ND <191 ND <182 ND ND <190 ND ND MW-LR-1 ND ND ND ND <183 ND ND ND ND ND ND ND ND MW-LR-2 ND ND ND ND <189 ND ND ND ND ND ND ND ND MW-LR-3 ND ND ND ND <191 ND ND ND ND ND ND ND ND MW-LR-4 <162 ND ND ND <184 ND ND <161 ND ND 226+/-128 <196 ND MW-LR-5 ND ND ND ND <197 ND ND ND ND ND ND ND ND MW-LR-5 ND ND ND ND <184 ND ND ND ND ND ND ND ND (Dup)

MW-LR-5 ND ND ND ND <118 ND ND ND ND ND ND ND ND (QA)

MW-LR-7 ND ND ND ND <180 ND ND ND ND ND ND ND ND MW-LR-8 391+/- 126 ND ND ND ND 464+/-142 ND 416+/-123 ND ND 604+/-141 ND ND MW-LR-8 430+/-124 ND ND ND ND ND ND 441+/-129 ND ND 636+/-149 ND ND (Dup)

MW-LR-8 332+/-181 ND ND ND ND ND ND 479+/-130 ND ND 346 +/- 99 ND ND (QA)

MW-LR-9 155 +/- 216 1650+/-230 1980+/-268 2090+/-264 ND 2300+/-303 2170+/-287 2260+/-287 1970+/-258 2170+/-282 5710+/-361 2510+/-318 3250+/-390 MW-LR-ND ND ND ND ND 2590+/-327 ND ND ND ND ND ND ND 9(Dup)

MW-LR-9 ND ND ND ND ND ND ND ND ND ND 2100+/-179 ND ND (QA)

MW-LR-10 <159 ND ND ND ND <185 ND <175 ND ND 222+/-131 ND ND LR-P11 <179 ND ND ND ND <187 ND <173 ND ND ND ND ND LR-P14 <172 ND ND ND ND <191 ND <173 ND ND ND ND ND LR-P17 ND ND ND ND <186 ND ND ND ND ND ND ND ND ND - No Data, Sample obtained as required (Dup) -Sample analyzed in duplicate by TBE (QA) -Additional sample collected and analyzed for Quality Assurance by GEL Laboratories 112

January 1 - December 31, 2022 Docket Nos. 50-352, 50-353 Table E-7 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage (Results in units of pCi/L +/- 2)

LOCATION 02/02/22 12/19/22 RS-1 211 +/-122 <175 RS-2 <187 278 +/-120 RS-3 559 +/-145 <169 RS-4 703 +/-156 <174 RS-5 1160+/-204 <191 RS-6 <189 <196 RS-7 283 +/-128 203 +/-132 RS-8 252 +/-127 <186 SE-7 ND <184 ESE-6 ND <180 E-5 ND <183 36S3 ND <188 ND - No Data, Sample obtained as required 113

LG-23-033, 2022 Annual Radiological Environmental Operating Report

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