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Annual Radiological Environmental Operating Report
	ML23132A048
Person / Time
Site:	Braidwood
Issue date:	05/31/2023
From:	; Constellation Energy Generation, Teledyne Brown Engineering Environmental Services
To:	; Office of Nuclear Reactor Regulation
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ML23132A046	List: BW230025, Annual Radiological Environmental Operating Report; ML23132A047;
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Docket No: 50-456 50-457 BRAIDWOOD STATION UNIT 1 and UNIT 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2022 Prepared By Teledyne Brown Engineering Environmental Services Constellation Braidwood Station Braceville, IL 60407 May 2023

Intentionally left blank Table Of Contents I. Preface ............................................................................................................................. 1 II. Summary and Conclusions ............................................................................................. 8 Ill. Introduction ................................................................................................................... 10 A. Objectives of the REMP ..................................................................................... 10 B. Implementation of the Objectives ...................................................................... 10 IV. Program Description .................................................................................................... 11 A. Sample Collection .............................................................................................. 11 B. Sample Analysis ................................................................................................ 12 C. Data Interpretation ............................................................................................. 13 D. Program Exceptions .......................................................................................... 14 E. Program Changes ............................................................................................. 15 V. Results and Discussion ................................................................................................ 16 A. Aquatic Environment ......................................................................................... 16

1. Surface Water ......................................................................................... 16

2. Public Water ............................................................................................ 16

3. Ground/Well Water ................................................................................. 17

4. Fish ......................................................................................................... 18

5. Sediment. ................................................................................................ 18 B. Atmospheric Environment ................................................................................. 19 1 . Airborne .................................................................................................. 19

a. Air Particulates ............................................................................. 19

b. Airborne Iodine ............................................................................. 19 C. Terrestrial Environment ..................................................................................... 20

1. Milk .......................................................................................................... 20

2. Food Products ......................................................................................... 20 D. Ambient Gamma Radiation ............................................................................... 20 E. Land Use Survey ............................................................................................... 21 F. Errata Data ......................................................................................................... 21 G. Summary of Results - Inter-laboratory Comparison Program .......................... 21

Appendices Appendix A Radiological Environmental Monitoring Report Annual Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for Braidwood Station, 2022 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2022 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2022 Figures Figure B-1 Inner Ring and Other OSLO Locations of Braidwood Station, 2022 Figure B-2 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2022 Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2022 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-1.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-1.3 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-1.4 Concentrations of lron-55 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-1.5 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-I1.1 Concentrations of Gross Beta in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 ii

Table C-I1.2 Concentrations of Tritium in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-I1.3 Concentrations of 1-131 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-II.4 Concentrations of Nickel-63 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-I1.5 Concentrations of lron-55 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-I1.6 Concentrations of Gamma Emitters in Public Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-II1.1 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-II1.2 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-IV.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-V.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vl.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-Vlll.3 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Braidwood Station, 2022 Table C-X.1 Quarterly OSLO Results for Braidwood Station, 2022 iii

Table C-X.2 Mean Quarterly OSLO Results for the Inner Ring, Outer Ring, Other, Control, and Independent Spent Fuel Storage Installation (ISFSI)

Locations for Braidwood Station, 2022 Table C-X.3 Summary of the Ambient Dosimetry Program for Braidwood Station, 2022 Figures Figure C-1 Surface Water - Gross Beta - Stations BD-10 and BD-25 (Control (C))

Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2007 - 2022 Figure C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2022 Figure C-4 Surface Water - Tritium - Stations BD-10 and BD-25 (C) Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2022 Figure C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2022 Figure C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-12 Ground/Well Water - Tritium - Stations BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2022 Figure C-13 Ground/Well Water - Tritium - Stations BD-53 and BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2022 Figure C-14 Air Particulate - Gross Beta - Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-15 Air Particulate - Gross Beta - Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2022 iv

Figure C-16 Air Particulate - Gross Beta - Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2022 Figure C-17 Air Particulate - Gross Beta - Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2022 Figure C-18 Air Particulate - Gross Beta - Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2022 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2022 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2022 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2022 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR)

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I. Preface The following sections of the preface are meant to help define key concepts, provide clarity, and give context 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 through the development of regulations governing nuclear power reactors and ensuring their compliance. As part of the many commitments Nuclear Power Plants have to the NRC to ensure this safety, they provide two reports annually to specifically address how the station's operation impacts the environment of 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 ARE RR reports the results of the sampling from the effluent release paths at the station analyzed for radioactivity. 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 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 Graphic 1 demonstrates some potential exposure pathways from Braidwood Nuclear Power 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.

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Understanding Radiation Generally radiation is defined as emitted energy in the form of waves or particles. If 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 Hubb/esite The Electromagnetic Spectrum Wave,.ngth h1 me1ers

<-1 About the size of:

11 Buil(lingB

'f; Graim~ Prolozoans Baclf:eria of sugar Molecules Atoms Alomi-c nuclei 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 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.

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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. 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 plant's 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 1000 800 The amount of time it takes for half of the original radioactivity to decay Activity 600 400 200 0

1 half-life 2 half-lives 3 half-lives 4 half-lives In the annual reports you will see both man-made and naturally-ocurring 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.

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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.

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.

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 (µCi), which means 1/1,000,000 of a Curie.

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 milliRoentgen (mR), 1/1,000 of one R.

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.

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. Half of this exposure, 310 mrem, comes from natural sources and the other half, 310 mrem, from man-made sources. Graphic 5 shows what the typical sources of radiation are for an individual over a calendar year:

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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%

Consumer - 2%

~ Natural Sources - 50 1% dif Manmade Sources - 50%

~ ~310 millirem (0.31 rem) * - * ~310 millirem {0.31 rem)

Source:NiCRP'Rep,ortNo.160(2.009) full report is available or> the NCRP' website at www.NCRP'online.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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Graphic 6 .Relative Doses from Radiation Sources, from EPA Radiation Doses and Sources RELATIVE DOSES FROM RADIATION SOURCES All doses from the National Council on Radiation Protection & Measurements, Report No. 160 (unlus otherwise denoted}

Whole body CT 1,000 mllllrem

( sing/fl procedute) u - ~ t 1 n 1 1 1 x-ray eum with tluoroscopy 600mllllrem (single procedure)

Radon In average U.S. homa 228mllllrem (annual)

HNdCT lOOmilllrem

( singhl procedure)

Cosmic r!Mlletlon IMng In oen....

(high elavatlon) appr0xlmately 80 mllllrem (annual)

Mammogram 42 mlllirem (single procedute) Cosmic radiation living at -

From lCRP 2001 level (tow elevation) approximately 30 ml!Orem (annual)

Radiation In the body 211m11Urem (annu111/J Terrestrial radloactlvltv 21 mllllrem (annual)

Chutx*ray 10 mllllrem (sing/11 procedure)

Living near a nuclear powv station

< l mlllirem (annual}

mrem 6

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 oven,'1eight Stroke -

Motor Vehide- Accident -

Air Pollution I Radon I Chemical Residue in Foods I Drowning I Hurricanes and i ornadoes 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 7

II. Summary and Conclusions This report on the Radiological Environmental Monitoring Program (REMP) conducted for Constellation's Braidwood Station covers the period January 1, 2022, through December 31, 2022. During that time period 1,561 analyses were performed on 1,265 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of Braidwood Station had no adverse radiological impact on the environment.

Surface, public, and ground/well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Surface water and public water samples were also analyzed for concentrations of gross beta. Gross beta and tritium activities detected were consistent with those detected in previous years. No fission or activation products were detected. As part of an effort to implement industry best practices, both gaseous and liquid station effluents were evaluated for all 10CFR61 required nuclides. Nuclides exceeding 1% relative abundance in the waste stream were added to the list of nuclides that Teledyne Brown evaluates in potentially impacted REMP matrices. For Braidwood Station, nickel-63 (Ni-63) exceeds 1%

relative abundance in the radwaste resins. Occasionally, Ni-63 is observed in liquid release tank quarterly composites, therefore, beginning in the fall of 2013 the station requested that Ni-63 be evaluated in the downstream surface water, sediment, and fish analyses. Nickel-63 has not been observed in downstream surface water.

Fish (commercially and/or recreationally-important species) and sediment samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were detected in fish. Nickel-63 was not detected in any fish or sediment samples analyzed. No plant-produced fission or activation products were found in sediment.

Air particulate samples were analyzed for concentrations of gross beta and gamma-emitting nuclides. No fission or activation products were detected.

High sensitivity iodine-131 (1-131) analyses were performed on weekly air samples.

All results were less than the minimum detectable concentration for 1-131.

Cow milk samples were analyzed for concentrations of 1-131 and gamma-emitting nuclides. lodine-131 was not detected in any milk samples. Concentrations of naturally-occurring potassium-40 (K-40) were detected. No fission or activation products were found in any samples and all required LLDs (Lower Limit of Detection) were met.

Food Product samples were analyzed for concentrations of gamma-emitting nuclides. No fission or activation products were found in any samples and all required LLDs were met.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (OSLO). Beginning in 2012, Constellation (formerly Exelon) changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated 8

Luminescent Dosimetry were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation). A dose evaluation was performed by taking the highest readings at the ISFSI pad and extrapolating dose to the nearest resident. The dose to the nearest resident was estimated to be 0.25 mrem in 2022.

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Ill. Introduction The Braidwood Station, consisting of two 3,645 MWt pressurized water reactors owned and operated by Constellation is located in Will County, Illinois. Unit No. 1 went critical on May 29, 1987. Unit No. 2 went critical on March 08, 1988. The site is located in northeastern Illinois, 20 miles south-southwest of Joliet, Illinois, 60 miles southwest of Chicago and southwest of the Kankakee River.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer Technologies on samples collected during the period January 1, 2022, through December 31, 2022.

A. Objectives 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. Evaluate 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.

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IV. Program Description A. Sample Collection Samples for the Braidwood Station REMP were collected for Constellation Energy by Environmental Inc. Midwest Labs (EIML). This section describes the general collection methods used by EIML to obtain environmental samples for the Braidwood Station REMP in 2022. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-3, Appendix B. The sampling methods used by EIML are listed in Table B-2.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, public water, well water, fish, and sediment.

Two-gallon water samples were collected weekly from six surface water locations [BD-10, BD-25 (Control (C)), BD-38, BD-40, BD-55 and BD-56],

and one weekly composite sample of public drinking water at location (BD-

22) and ground/well water samples collected quarterly from eight locations (BD-13, BD-34, BD-35, BD-36, BD-37, BD-50, BD-51 and BD-54). All samples were collected in new plastic bottles, which were rinsed with source water prior to collection per procedure. Fish samples comprised of quillback, golden redhorse, flathead catfish, smallmouth bass, channel catfish, common carp and largemouth bass flesh were collected semiannually at three locations, BD-25 (C), BD-28 and BD-41. Sediment samples composed of recently deposited substrate were collected at three locations semiannually, BD-10, BD-25 (C), BD-57. Two additional samples were taken at location BO-Spoil.

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate and airborne iodine. Air particulate samples were collected and analyzed weekly at eight locations [BD-02, BD-03 (C), BD-04, BD-05, BD-06, BD-19, BD-20 and BD-21]. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters installed. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air particulate filters and air iodine cartridges were replaced weekly and sent to the laboratory for analysis.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on food product samples. Food products and broadleaf vegetation were collected at six locations (BO-Control, BO-Quad 1, BO-Quad 2, BO-Quad 3, BO-Quad 4, BWD-G1 and BWD-G2). Various types of samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in 2012, Constellation (formerly Exelon) changed the type of 11

dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimeters (OSLO) were deployed and the use of Thermoluminescent Dosimeters (TLD) was discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

Each location consisted of two OSLDs. The OSLDs were exchanged quarterly and sent to Landauer for analysis. The OSLDs were placed at locations on and around the Braidwood Station site as follows:

An inner ring consisting of sixteen locations (BD-101, BD-102, BD-103, BD-104, BD-105, BD-106, BD-107, BD-108, BD-109, BD-110, BD-111a, BD-112, BD-113a, BD-114, BD-115and BD-116)atornearthesite boundary.

An outer ring consisting of sixteen locations (BD-201, BD-202, BD-203, BD-204, BD-205, BD-206, BD-207, BD-208, BD-209, BD-210, BD-211, BD-212, BD-213, BD-214, BD-215 and BD-216) extending to approximately 5 miles from the site. ~

An additional set located at the eight fixed air sampling locations (BD-02, BD-3 (C), BD-04, BD-05, BD-06, BD-19, BD-20 and BD-21 ).

An ISFSI set consisting of six locations (BD-ISFSl-104-3, BD-ISFSl-104-4, BD-ISFSl-105-3, BD-ISFSl-105-4, BD-ISFSl-110-3 and BD-ISFSl-110-4).

The specific OSLO 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;

3. Where estimated annual dose from Braidwood Station, if any, would be most significant.

8. Sample Analysis This section describes the general analytical methodologies used by TSE to analyze the environmental samples for radioactivity for the Braidwood Station REMP in 2022. The analytical procedures used by the laboratories are listed in Table 8-2.

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

1. Concentrations of beta emitters in public and surface water and air particulates.

2. Concentrations of gamma emitters in public, ground/well and surface water, air particulates, milk, grass, fish, sediment and food products.

3. Concentrations of tritium in public, ground/well and surface water.

4. Concentrations of 1-131 in air, milk and public water.

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5. Concentrations of Ni-63 in surface water, fish and sediment.

6. Ambient gamma radiation levels at various site environs.

C. Data Interpretation The radiological and direct radiation data collected prior to Braidwood Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Braidwood Station was considered operational at initial criticality. In addition, data was 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) was 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 was 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 were designed to achieve the required Braidwood Station detection capabilities for environmental sample analysis.

The MDC is the smallest concentration of radioactive material in a sample that will yield a net count, above system background, that will be detected with 95% probability with only 5% probability of falsely concluding that a blank observation represents a "real" signal. The MDC is an a posteriori determination.

2. Net Activity Calculation and Reporting of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity resulting in a negative number. An MDC was reported in all cases where positive activity was not detected.

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

For surface water, public water, ground/well water, air particulate/

radioiodine, milk, vegetation and fish, twelve nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140 and La-140 were reported.

For sediment, eleven nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were reported.

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

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D. Program Exceptions For 2022, the Braidwood Station REMP had a sample recovery rate in excess of 98%. Sample anomalies and missed samples are listed in the tables below:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Ty12e Code Date Sample collected after 2 weeks run. Collector was unable to reach APA! BD-21 02/10/22 the sampler due to a heavy snow accumulation.

Timer broke after 13.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months . Filter appears to be similar to other AP/Al BD-20 07/21/22 samples. Run time calculated, timer exchanged.

AP/Al BD-03 10/20/22 Pump stopped working after 20.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months ; pump exchanged.

AP/Al BD-03 11/17/22 Timer indicates low value of 74.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months due to recent power failure.

Timer broke down. Filter appears similar in color to other samples.

AP/Al BD-02 12/08/22 Run time calculated.

Timer indicates lower value of 118 hours0.00137 days 0.0328 hours 1.951058e-4 weeks 4.4899e-5 months . Possible power outage.

AP/Al BD-19 12/29/22 NOTE: problem identified as a timer failure. Timer exchanged on 01/12/23.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date(s) 01/06/22 SW BD-10 No sample; river frozen

- 02/10/22 01/06/22

- 01 /13/22 SW BD-25 No sample; river frozen 01/27/22

- 02/24/22 01/06/22 SW BD-38 01/20/22 No sample; lake frozen

- 02/10/22 SW BD-55 01/06/22 No sample; lake frozen

- 02/24/22 01/06/22 SW BD-56 - 02/10/22 No sample; lake frozen 02/24/22 SW BD-25 04/07/22 No sample, area flooded, access closed AP/Al BD-03 10/06/22 Pump stopped working after 20.3 hrs; pump exchanged 10/27/22 AP/Al BD-03 No power at the sampler; station informed

- 11 /10/22 BD-25 BD-38 12/22/22 SW No sample; river/lake/pond frozen BD-55 - 12/29/22 BD-56 SW BD-10 12/29/22 No sample; river frozen 14

Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance issues were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns, power outages and weather related issues were unavoidable.

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

E. Program Changes There were no program changes in 2022.

15

V. Results and Discussion A. Aquatic Environment

1. Surface Water (SW)

Samples were taken weekly and composited monthly at six locations (BD-10, BD-25 (C), BD-38, BD-40, BD-55 and BD-56). Of these locations, only BD-10 could be affected by Braidwood Station's effluent releases as it is downstream of the NPDES-permitted outfall. The following analyses were performed:

Gross Beta Samples from all locations were analyzed for concentrations of gross beta (Table C-1.1, Appendix C). Gross beta was detected in 58 of 67 samples. The values ranged from 2.2 to 13.8 pCi/L. Concentrations detected were consistent with those detected in previous years.

(Figures C-1 through C-3, Appendix C)

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-1.2, Appendix C). Tritium activity was detected in 5 of 24 samples. Concentrations ranged from 184 +/- 875, which were consistent with those detected in previous years.

(Figures C-4 through C-6, Appendix C)

Nickel-63 Monthly samples were analyzed for Ni-63 activity. Ni-63 was not detected and the required LLD was met. (Table C-1.3, Appendix C) lron-55 Monthly samples were analyzed for Fe-55 activity. Fe-55 was not detected and the required LLD was met. (Table C-1.4, Appendix C)

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides.

No nuclides were detected and all required LLDs were met.

(Table C-I.4, Appendix C)

2. Public Water (PW)

Monthly composites of weekly samples were made at one location (BD-22). This location could be affected by Braidwood Station's effluent releases. The following analyses were performed:

Gross Beta Samples from the location were analyzed for concentrations of gross beta (Tables C-I1.1, Appendix C). Gross beta was detected in 9 of 12 samples. The values ranged from 2.9 to 5.5 pCi/L. Concentrations 16

detected were consistent with those detected in previous years.

(Figure C-7, Appendix C)

Tritium Monthly composites of weekly samples from BD-22 were analyzed for tritium activity (Table C-11.2, Appendix C). Tritium was detected in 9 of 12 samples. Concentrations ranged from 337 to 3,050 pCi/L.

Concentrations detected were consistent with those detected in previous years (Figure C-8, Appendix C).

Iodine Monthly composites of weekly samples from the location were analyzed for 1-131. Iodine was not detected in any samples and the required LLD was met. (Table C-11.3, Appendix C)

Nickel-63 Monthly samples were analyzed for Ni-63 activity. Ni-63 was detected in 1 of 12 samples with a concentration of 64 pCi/L. The required LLD was met on all samples. (Table C-11.4, Appendix C) lron-55 Monthly samples were analyzed for Fe-55 activity. Fe-55 was not detected and the required LLD was met. (Table C-11.5, Appendix C)

Gamma Spectrometry Samples from the location were analyzed for gamma emitting nuclides.

No nuclides were detected and all required LLDs were met.

(Table C-I1.6, Appendix C)

3. Ground/Well Water (WW)

Quarterly samples were collected at eight locations (BD-13, BD-34, BD-35, BD-36, BD-37, BD-50, BD-51 and BD-54). The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-II1.1, Appendix C). Tritium was detected in one sample at the detection limit with a concentration of 198 pCi/L. Concentrations were consistent with those in previous years.

(Figures C-9 through C-13, Appendix C)

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides.

No nuclides were detected and all required LLDs were met.

(Table C-11.3, Appendix C) 17

4. Fish Fish samples comprising the flesh of smallmouth bass, golden red horse, shorthead redhorse, common carp, and largemouth bass were collected at three locations (BD-25, BD-28, and BD-41) semiannually. Location BD-28 could be affected by Braidwood Station's effluent releases. The following analyses were performed:

lron-55 The edible portion of fish samples from all three locations was analyzed for Fe-55 activity. Fe-55 was not detected and the required LLD was met. (Table C-I1.3, Appendix C)

Nickel-63 The edible portion of fish samples from all three locations was analyzed for Ni-63 activity. Ni-63 was not detected and the required LLD was met.

(Table C-IV.1, Appendix C)

Gamma Spectrometry The edible portion of fish samples from all three locations was analyzed for gamma emitting nuclides. No fission or activation products were found. No nuclides were detected and all required LLDs were met.

(Table C-IV.1, Appendix C)

5. Sediment (BS)

Aquatic sediment samples were collected at three locations (BD-10, BD-25 (C), and BD-57) semiannually. The locations at the Braidwood Station outfall to the Kankakee River (BD-57) and downstream of the outfall (BD-10), could be affected by Braidwood Station's effluent releases. Sediment samples were also obtained from spoil piles resulting from river dredging in the vicinity of the station's outfall.

The following analyses were performed:

lron-55 Sediment samples from all three locations was analyzed for Fe-55 activity. Fe-55 was not detected and the required LLD was met.

(Table C-V.1, Appendix C)

Nickel-63 Sediment samples from all three locations was analyzed for Ni-63 activity. Ni-63 was not detected and the required LLD was met.

(Table C-V.1, Appendix C)

Gamma Spectrometry Sediment samples from the location were analyzed for gamma emitting nuclides. Cesium-137 (Cs-137) was detected in one sample at a concentration of 157 pCi/kg dry. No other fission or activation products were found and all required LLDs were met. (Table C-V.1, Appendix C) 18

B. Atmospheric Environment

1. Airborne (AP/Al)

a. Air Particulates Continuous air particulate samples were collected from eight locations on a weekly basis. The eight locations were separated into three groups: Near field samplers (BD-06, BD-19, BD-20 and BD-21), far field samplers within 10 km of the site (BD-02, BD-04 and BD-05) and the Control sampler between 10 and 30 km from the site (BD-03). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-Vl.1 and C-Vl.2, Appendix C). Detectable gross beta activity was observed at all locations. Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of Braidwood Station. The results from the near field (Group I) ranged from 8E-03 to 41 E-03 pCi/m 3 with a mean of 20E-03 pCi/m 3 . The results from the far field (Group II) ranged from

?E-03 to 40E-03 pCi/m 3 with a mean of 20E-03 pCi/m 3 . The results from the Control location (Group Ill) ranged from 9E-03 to 33E-03 pCi/m 3 with a mean of 20E-03 pCi/m 3 . Comparison of the 2022 air particulate data with previous years' data indicate no effects from the operation of Braidwood Station. Additionally, a comparison of the weekly values for 2022 indicate no notable differences among the three groups. (Figures C-14 through C-18, Appendix C)

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides. No nuclides were detected and all required LLDs were met. (Table C-Vl.3, Appendix C)

b. Airborne Iodine Continuous air samples were collected from eight locations (BD-02, BD-03, BD-04, BD-05, BD-06, BD-19, BD-20 and BD-21) and analyzed weekly. The following analysis was performed:

1-131 Continuous air samples were collected from eight locations for 1-131. All results were less than the minimum detectable concentration for 1-131. The required LLD was met for all analyses.

(Table C-Vll.1, Appendix C) 19

C. Terrestrial Environment

1. Milk (Ml)

One sample was collected from one location (control location BD-18) in April. The following analyses were performed:

lodine-131 The milk sample was analyzed for concentrations of 1-131. lodine-131 was not detected in any samples. All required LLDs were met.

(Table C-Vlll.1, Appendix C)

Gamma Spectrometry The milk sample was analyzed for concentrations of gamma emitting nuclides. No nuclides were detected and all required LLDs were met.

(Table C-Vlll.2 & Table C-Vlll.3, Appendix C)

2. Food Products (VE)

Food product samples were collected at eight locations: BO-Control, BO-Quad 1, BO-Quad 2, BO-Quad 3, BO-Quad 4, BWD-G1 and BWD-G2 when available. The following analysis was performed:

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides.

No nuclides were detected and all required LLDs were met.

(Table C-IX.1, Appendix C)

D. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Optically Stimulated Luminescence Dosimeter (OSLO). Forty-eight OSLO locations were established around the site, each with two OSLD's installed for measurement. The data was analyzed using methods acceptable for demonstrating compliance with the Environmental Protection Agency (EPA) 40 CFR 190, "Environmental Radiation Protection Standards for Nuclear Power Operations". It incorporates the concepts of ANSI/HPS N13.37, "Environmental Dosimetry". Results of OSLO measurements are listed in Tables C-X.1 to C-X.3, Appendix C.

All OSLO measurements had a range of 9.6 to 59.4 mrem/std. quarter. A comparison of the Inner Ring, Outer Ring and Other data to the Control Location data, indicate that the ambient gamma radiation levels from all locations were similar.

Annual Facility Dose was reported for station BD-ISFSl-105-4. The direct dose to the nearest resident was estimated to be 0.25 mrem for the year.

20

E. Land Use Survey A Land Use Survey conducted during September 7, 2022, around the Braidwood Station was performed by EIML for Constellation to comply with section 12.5.2 of the Braidwood Station's Offsite Dose Calculation Manual ODCM). The purpose of the survey was to document the nearest resident, milk-producing animal and garden of greater than 500 ft2 in each of the sixteen 22 1/2 degree sectors around the site. For dose calculation, a garden is assumed at the nearest residence. There were no notable changes to the 2022 land use census. The results of this survey are summarized below:

Distance in Miles from the Braidwood Station Reactor Buildings Residence Livestock Milk Farm Sector Miles Miles Miles A N 0.50 2.6 B NNE 0.88 C NE 0.65 D ENE 0.60 E E 1.50 2.3 F ESE 2.20 2.3 G SE 2.70 2.7 H SSE 4.50 J s 4.20 K SSW 4.00 5.3 L SW 0.40 M WSW 0.45 N w 0.35 1.6 8.7 p WNW 0.40 Q NW 0.40 R NNW 0.40 F. Errata Data There was no errata data for 2022 REMP.

G. Summary of Results - Inter-Laboratory Comparison Program The TBE Laboratory analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation, and water matrices for various analytes. The PE samples supplied by Analytics Inc., Environmental Resource Associates (ERA) and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

21

1. Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of TB E's result and Analytics' known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

2. ERA Evaluation Criteria ERA's evaluation report provides an acceptance range for control and warning limits with associated flag values. ERA's acceptance limits are established per the USEPA, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (PT) program requirements or ERA's SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

3. DOE Evaluation Criteria MAPEP's evaluation report provides an acceptance range with associated flag values. MAPEP defines three levels of performance:

Acceptable (flag = "A") - result within +/- 20% of the reference value

Acceptable with Warning (flag = "W') - result falls in the +/- 20%

to +/- 30% of the reference value

Not Acceptable (flag = "N") - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

For the TBE laboratory, 142 out of 150 analyses performed met the specified acceptance criteria. Eight analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program.

NOTE: Two analyses (soil for Tc-99 and U-238) that did not meet acceptance criteria was performed for TBE information and is not on the list of required !GP analyses. A summary is found below:

1. The Analytics March 2022 AP Ce-141 resu It was evaluated as Not Acceptable. The reported value for Ce-141 was 60.9 pCi and the known result was 42.0 pCi/L (1.45 ratio of reported result vs. known; TBE's internal acceptance range is 0.70 - 1.30). This sample was used as the workgroup duplicate with a result of 45.7 (109% of known) and was also counted on a different detector with a result of 50.9 (121 % of known).

This was TBE's first failure for AP Ce-141. (NCR 22-04) 22

2. The MAPEP February 2022 Urine U-234 & U-238 results were evaluated as Not Acceptable. TBE's reported values of 0.142 and 0.0254 were above the known upper ranges of 0.0096 and 0.0134 respectively for U-234 and U-238. These spiked values were below TBE's typical MDC for urine client samples. The samples were re-prepped using a larger sample aliquot and counted for 60 hours6.944444e-4 days 0.0167 hours 9.920635e-5 weeks 2.283e-5 months as opposed to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months . The recount results were 0.00732 for U-234 and 0.0119 for U-238 (both within acceptable range). MAPEP urine samples will be flagged to use a larger sample aliquot and counting time than typical client samples. MAPEP did not include any urine cross-check samples in August. (NCR 22-05)

3. The ERA MRAD September 2022 AP Pu-238 was evaluated as Not Acceptable. The reported value was 38.8 pCi and the known result was 29.9 (acceptance range 22.6 - 36.7). The AP filter was cut in half prior to digestion (shared with Fe-55) but should have been complete digested together and aliquotted afterwards like typical client samples. This is the first failure for AP Pu-238. (NCR 22-19)

4. The ERA October 2022 water Uranium result was evaluated as Not Acceptable. The reported value was 10.54 pCi/L and the known was 8.53 (acceptance range 6.60 - 9.88) or 124% of the known (acceptable for TBE QC). The 2-sigma error was 3.2, placing the reported result well within the acceptable range. This sample was used as the workgroup duplicate with a result of 8.2 +/- 2.9 pCi/L (also within the acceptable range). All other QA was reviewed with no anomalies. (NCR 22-20)

5. The Analytics AP Co-60 result was evaluated as Not Acceptable. The reported value was 207 pCi and the known was 147 (141% of the known). TBE's internal QC acceptance is 70 - 130%. All QA was reviewed with no anomalies. This sample was used as the workgroup duplicate and counted on a different detector with a result of 167 pCi (114% of the known). This is the first failure for AP Co average result ratio compared to the known is 109%. (NCR 22-21)

6. The MAPEP August 2022 water Tc-99 result was evaluated as Not Acceptable. The reported value was 1.86 +/- 0.414 Bq/L for this "false positive" test. The evaluation of the submitted result to the 3 times the uncertainty indicated a slight positive. This sample was used as the workgroup duplicate with a result of 0.88 +/- 0.374 Bq/L. All QC was reviewed, and no anomalies found. This is the first unacceptable since the resumption of reporting water Tc-99 for the 3 rd quarter of 2020.

TBE to known ratios have ranged from 94-109% during this time.

(NCR 22-22)

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

23

APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT ANNUAL

SUMMARY

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

SUMMARY

FOR BRAIDWOOD STATION, 2022 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN {M) STATION# NON ROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 67 4 6.6 4.6 10.4 BD-40 INDICATOR 0 (PCl!LITER) (47/56) (11/11) (12/12) BRAIDWOOD STATION COOLING LAKE 2.2 - 13.8 2.7-6.8 5.1 - 13.8 ONSITE H-3 24 200 437 <LLD 765 BD-10 INDICATOR 0 (5/20) (2/4) KANKAKEE RIVER DOWNSTREAM 184- 875 654- 875 5.4 MILES NE OF SITE Nl-63 22 30 <LLD <LLD 0 FE-55 22 200 <LLD <LLD 0

)> GAMMA 67 I

MN-54 15 <LLD <LLD 0 C0-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 CO-60 15 <LLD <LLD 0 ZN-65 30 <LLD <LLD 0 NB-95 15 <LLD <LLD 0 ZR-95 30 <LLD <LLD 0 1-131 15 <LLD <LLD 0 CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 PUBLIC WATER GR-B 12 4 3.7 NA 3.7 BD-22 INDICATOR 0 (PCIILITER) (9/12) (9/12) WILMINGTON 2.9-5.5 2.9-5.5 6.0 MILES NE OF SITE H-3 12 200 1173 NA 1173 BD-22 INDICATOR 0 (9/12) (9/12) WILMINGTON 337 - 3050 337 - 3050 6.0 MILES NE OF SITE 1-131 12 1 <LLD NA 0 Nl-63 12 30 64 <LLD 64 BD-22 INDICATOR 0 (1/12) (1/12) WILMINGTON 6.0 MILES NE OF SITE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2022 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS PUBLIC WATER FE-55 12 200 <LLD <LLD 0 (PCl!LITER) GAMMA 12 MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 CO-60 15 <LLD NA 0 ZN-65 30 <LLD NA 0 NB-95 15 <LLD NA 0 ZR-95 30 <LLD NA 0

)> CS-134 15 <LLD NA 0 I

l'J CS-137 18 <LLD NA 0 BA-140 60 <LLD NA 0 LA-140 15 <LLD NA 0 GROUND WATER H-3 32 200 198 NA 198 BD-34 INDICATOR 0 (PCl!LITER) (1132) (114) GIBSON WELL 4.7 MILES E OF SITE GAMMA 32 MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 CO-60 15 <LLD NA 0 ZN-65 30 <LLD NA 0 NB-95 15 <LLD NA 0 ZR-95 30 <LLD NA 0 1-131 15 <LLD NA 0 CS-134 15 <LLD NA 0 CS-137 18 <LLD NA 0 BA-140 60 <LLD NA 0 LA-140 15 <LLD NA 0 FISH FE-55 12 260 <LLD <LLD 0 (PCl!KG WET)

(M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2022 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH Nl-63 12 260 <LLD <LLD 0 (PCIIKG WET) GAMMA 12 MN-54 130 <LLD <LLD 0 CO-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0 CO-60 130 <LLD <LLD 0 ZN-65 260 <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0

)>

I 1-131 NA <LLD <LLD 0 Cl,)

CS-134 130 <LLD <LLD 0 CS-137 150 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 SEDIMENT FE-55 8 2000 <LLD <LLD 0 (PCIIKG DRY)

Nl-63 8 260 <LLD <LLD 0 GAMMA 8 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 150 <LLD <LLD 0 CS-137 180 157 <LLD 157 BD-10 INDICATOR 0 (1/4) (1/2) KANKAKEE RIVER DOWNSTREAM 5.4 MILES NE OF SITE BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2022 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GR-B 411 10 20 20 21 BD-20 INDICATOR 0 (E-3 PC/ICU.METER) (363/363) (47/48) (52/52) NEARSITE N 7 - 41 9-33 9-37 0.6 MILES N OF SITE GAMMA 32 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0

)>

I NB-95 NA <LLD <LLD 0

.i:,..

ZR-95 NA <LLD <LLD 0 CS-134 50 <LLD <LLD 0 CS-137 60 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 AIR IODINE GAMMA 411 (E-3 PC/ICU.METER) 1-131 70 <LLD <LLD 0 MILK 1-131 1 1 <LLD <LLD 0 (PCIILITER)

GAMMA MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0 CS-134 15 <LLD <LLD 0 CS-137 18 <LLD <LLD 0 BA-140 60 <LLD <LLD 0 LA-140 15 <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2022 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2022 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS GRASS GAMMA 0 (PC/!KG WET) MN-54 NA 0 CO-58 NA 0 FE-59 NA 0 CO-60 NA 0 ZN-65 NA 0 NB-95 NA 0 ZR-95 NA 0 CS-134 60 0 CS-137 60 0

)>

I BA-140 80 0 c.n LA-140 NA 0 0

VEGETATION GAMMA 130 (PC/!KG WET) MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 CO-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 ZR-95 NA <LLD <LLD 0

/-131 60 <LLD <LLD 0 CS-134 60 <LLD <LLD 0 CS-137 80 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 DIRECT RADIATION OSLD-QUARTERLY 184 NA 6.5 15.8 46.9 BD-ISFSl-105-4 INDICATOR 0 (MILLIREM!QTR.) (1801180) (414) (414) 9.6- 59.4 14.0- 17.8 32.07 - 59.4 0.20 MILES SE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

Intentionally left blank APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS

Intentionally left blank TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2022 Distance & Direction Location Location Description from Site A. Surface Water BD-10 Kankakee River Downstream (indicator) 5.4 miles NE BD-25 Kankakee River Upstream (control) 9.6 miles E BD-38 Main Drainage Ditch (indicator) 1.5 miles SE BD-40 Braidwood Station Cooling Lake (indicator) Onsite (1.0 mile E)

BD-55 North Pond Fatlan Site (indicator) 0.6 miles NE BD-56 South Pond Fatlan Site (indicator) 0.6 miles NE B. Drinking (Potable) Water BD-22 Wilmington (indicator) 6.0 miles NE C. Ground/Well Water BD-13 Braidwood City Hall Well (indicator) 1.7 miles NNE BD-34 Gibson Well (indicator) 4.7 miles E BD-35 Joly Well (indicator) 4.7 miles E BD-36 Hutton Well (indicator) 4.7 miles E BD-37 Nurczyk Well (indicator) 4.7 miles E BD-50 Skole Well (indicator) 4.7 miles E BD-51 Fatlan Well (indicator) 0.6 miles NE BD-54 Cash Well (indicator) 0.9 miles NE D. Milk - Bi-Weekly/ Monthly BD-18 Biros' Farm (control) 8.7 miles W E. Air Particulates / Air Iodine BD-02 Custer Park (indicator) 5.0 miles E BD-03 County Line Road (control) 6.2 miles ESE BD-04 Essex (indicator) 4.8 miles SSE BD-05 Gardner (indicator) 5.5 miles SW BD-06 Godley (indicator) 0.5 miles WSW BD-19 Nearsite NW (indicator) 0.3 miles NW BD-20 Nearsite N (indicator) 0.6 miles N BD-21 Nearsite NE (indicator) 0.5 miles NE F. Fish BD-25 Kankakee River, Upstream (control) 9.6 miles E BD-28 Kankakee River, Discharge (indicator) 5.4 miles E BD-41 Cooling Lake (indicator) Onsite (1.0 mile E)

G. Sediment BD-10 Kankakee River, Downstream (indicator) 5.4 miles NE BD-25 Kankakee River Upstream (control) 9.6 miles E BD-57 Circulating Water Slowdown Discharge (indicator) 5.4 miles E BD-Spoil-1 Circulating Water Slowdown Discharge (indicator) 5.4 miles E BD-Spoil-2 Circulating Water Slowdown Discharge (indicator) 5.4 miles E H. Food Products BWD-G1 Nearsite NE 0.54 miles NE BWD-G2 Nearsite W 0.21 miles W Quadrant 1 Clark Farm 3.8 miles ENE Quadrant 2 W.F. Soltwisch 4.5 miles SSE Quadrant 3 Terri Schultz 4.8 miles SSW Quadrant 4 Bruce Sinkular 1.9 miles NNW Control Gorman Farm 9.0 miles NE B-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2022 Distance & Direction Location Location Description from Site I. Environmental Dosimetry - OSLO Inner Ring BD-101 0.5 miles N BD-102 1.1 miles NNE BD-103 1.0 mile NE BD-104 0.7 miles ENE BD-105 2.2 miles E BD-106 2.5 miles ESE BD-107 3.2 miles SE BD-108 3.2 miles SSE BD-109 3.8 miles S BD-110 2.8 miles SSW BD-111a 1.4 miles SW BD-112 0.7 miles WSW BD-113a 0.5 miles W BD-114 0.4milesWNW BD-115 0.3 miles NW BD-116 0.4 miles NNW Outer Ring BD-201 4.2 miles N BD-202 4.8 miles NNE BD-203 4.9 miles NE BD-204 4.3 miles ENE BD-205 4.0 miles E BD-206 4.5 miles ESE BD-207 4.5 miles SE BD-208 4.5 miles SSE BD-209 4.8 miles S BD-210 5.3 miles SSW BD-211 4.8 miles SW BD-212 5.0 miles WSW BD-213 4.8 miles W BD-214 4.3 miles WNW BD-215 4.5 miles NW BD-216 4.0 miles NNW Other BD-02 Custer Park (indicator) 5.0 miles E BD-03 13000 W. Road (control) 6.2 miles ESE BD-04 Essex (indicator) 4.8 miles SSE BD-05 Gardner (indicator) 5.5 miles SW BD-06 Godley (indicator) 0.5 miles WSW BD-19 Nearsite NW (indicator) 0.3 miles NW BD-20 Nearsite N (indicator) 0.6 miles N BD-21 Nearsite NE (indicator) 0.5 miles NE ISFSI BD-ISFSl-104-3 0.11 miles E BD-ISFSl-104-4 0.13 miles E BD-ISFSl-105-3 0.23 miles SE BD-ISFSl-105-4 0.20 miles SE BD-ISFSl-110-3 0.18 miles SE BD-ISFSl-110-4 0.15 miles SE B-2

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2022 Distance in Miles from the Braidwood Station ISFSI Pad, 2022 Sector Residence Miles N WNW 0.7 p WNW 0.7 Q NW 0.7 R NNW 0.7 Distance in Miles from the Braidwood Station Reactor Buildings, 2022 Sector Residence Miles Livestock Miles Milk Farm Miles A N 0.5 2.6 B NNE 0.9 C NE 0.7 D ENE 0.8 3.3 E E 1.5 2.3 F ESE 2.2 2.3 G SE 2.7 2.7 H SSE 4.5 J s 4.2 4.8 K SSW 1.3 5.3 L SW 0.4 1.2 M WSW 0.5 N w 0.4 1.6 8.7 p WNW 0.4 Q NW 0.4 R NNW 0.4 B-3

TABLE 8-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2022 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Gamma Monthly composite from weekly grab TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Water Spectroscopy samples Surface Monthly composite from weekly grab TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity Gross Beta Water samples in Various Matrices Surface Monthly composite from weekly grab lron-55 TBE, TBE-2006 lron-55 Activity in Various Matrices Water samples Surface Monthly composite from weekly grab Nickel-63 TBE, TBE-2013 Radionickel Activity in Various Matrices Water samples Surface Quarterly composite from weekly grab TBE, TBE-2011 Tritium Analysis in Drinking Water by Tritium Water samples Liquid Scintillation Drinking Gamma Monthly composite from weekly TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Water Spectroscopy composite samples TBE. TBE-2023 Compositing of Samples TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity Drinking Monthly composite from weekly Gross Beta in Various Matrices Water composite samples TBE. TBE-2023 Compositing of Samples Drinking Monthly composite from weekly TBE, TBE-2012 Radioiodine in Various Matrices Iodine Water composite samples TBE. TBE-2023 Compositing of Samples Drinking Monthly composite from weekly grab lron-55 TBE, TBE-2006 lron-55 Activity in Various Matrices Water samoles Drinking Monthly composite from weekly grab Nickel-63 TBE, TBE-2013 Radionickel Activity in Various Matrices Water samples TBE, TBE-2011 Tritium Analysis in Drinking Water by Drinking Monthly composite from weekly Tritium Liquid Scintillation Water composite samples TBE. TBE-2023 Compositing of Samples Ground/ Gamma Quarterly grab sample TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Well Water Spectroscopy Ground/ TBE, TBE-2011 Tritium analysis in Drinking Water by Tritium Quarterly grab sample Well Water Liquid Scintillation Gamma Semi-annual samples collected via Fish TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy electro-shocking or other techniques Semi-annual samples collected via Fish lron-55 TBE, TBE-2006 lron-55 Activity in Various Matrices electro-shocking or other techniques Semi-annual samples collected via Fish Nickel-63 TBE, TBE-2013 Radionickel Activity in Various Matrices electroshocking or other techniques Gamma Sediment Semi-annual grab samples TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy Sediment lron-55 Semi-annual grab samples TBE, TBE-2006 lron-55 Activity in Various Matrices Sediment Nickel-63 Semi-annual grab samples TBE, TBE-2013 Radionickel Activity in Various Matrices Air One-week composite of continuous air TBE, TBE-2008 Gross Alpha and/or Gross Beta Activity Gross Beta Particulates sampling through glass fiber filter paper in Various Matrices Air Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Quarterly composite of each station Particulates Spectroscopy TBE. TBE-2023 Compositing of Samples Weekly composite of continuous air Air Iodine 1-131 TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis sampling through charcoal filter Gamma Bi-weekly grab sample May through Milk TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Spectroscopy October. Monthly all other times Bi-weekly grab sample May through Milk 1-131 TBE, TBE-2012 Radioiodine in Various Matrices October. Monthly all other times Food Gamma Grab samples during the growing season TBE, TBE-2007 Gamma-Emitting Radioisotope Analysis Products Spectroscopy Optically Stimulated Quarterly OSLDs comprised of two OSLO Luminescence Ai,03:C Landauer Incorporated Landauer Incorporated Dosimetry elements.

8-4

Ii 1 B'>id%0d Sl>lio,, ~

2

Inner Ring Dosimeters .!!.~

Figure B-1 lnne, Ring and Othe; 0Sto Loca,on, of Braidwood Station, 2022 8-5

1 . Braidwood Station

2. Outer Ring Dosimeters

3. ;.ir Sampling Locations Figure B-2 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2022 8-6

n. 113 Braidwood Station II ;o

:;.a *.;;

i!

"fl

~ County Linc Rd N

t OFFSITE DOSE CALCULATION :MA.NU.AL BRAIDWOOD STATION 0 1 2 3 4 5 FIGURE. 11-3 I.I wl I I I I Miles lNGE5TIOtf AND 'i'IA TEROORNE EX?CISlJRF.

PA nmh, YSAMPL.E: LOCA TtONS

Wiiter 4,. s~dl.lilen:

foh X Milk Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2022 8-7

Intentionally left blank APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank Table C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/06/22 - 01/27/22 (1) 3.2 +/- 1.9 8.9 +/- 2.7 7.1 +/- 2.7 (1) (1) 02/17/22 - 02/17/22 < 3.3 (1) < 3.9 12.8 +/- 3.0 (1) < 3.7 03/03/22 - 04/01 /22 4.5 +/- 2.0 2.7 +/- 1.9 6.1 +/- 2.5 10.9 +/- 3.4 3.4 +/- 1.7 < 2.8 04/07122 - 04/28/22 3.3 +/- 2.2 4.8 +/- 2.3 9.9 +/- 3.1 6.8 +/- 2.8 5.2 +/- 2.1 < 3.3 05/05/22 - 05/26/22 5.4 +/- 2.5 5.5 +/- 2.5 8.2 +/- 2.9 11.6 +/- 3.4 4.0 +/- 2.0 5.8 +/- 2.7 06/02/22 - 06/30/22 2.9 +/- 2.0 3.3 +/- 2.0 3.8 +/- 2.6 10.8 +/- 3.0 2.9 +/- 1.7 < 3.1 07107/22 - 07/28/22 5.8 +/- 2.0 6.8 +/- 2.1 8.6 +/- 2.6 10.3 +/- 2.6 5.0 +/- 1.8 3.3 +/- 1.9 08/04/22 - 08/24/22 4.4 +/- 2.1 4.7 +/- 2.1 6.4 +/- 2.6 12.6 +/- 2.9 3.2 +/- 1.7 < 2.7 09/01122 - 09/29/22 2.2 +/- 1.5 3.4 +/- 1.6 3.6 +/- 1.9 5.1 +/- 2.0 < 1.5 < 1.7 10/06/22 - 10/27/22 4.5 +/- 2.1 4.6 +/- 2.1 8.4 +/- 2.7 13.8 +/- 3.1 4.7 +/- 1.9 4.2 +/- 2.0 11 /03/22 - 11 /23/22 6.9 +/- 2.4 5.5 +/- 2.2 7.9 +/- 2.8 10.4 +/- 2.9 3.1 +/- 1.7 5.5 +/- 2.2 12/01/22 - 12/15/22 6.8 +/- 2.1 5.8 +/- 2.0 7.6 +/- 2.3 12.3 +/- 2.7 4.5 +/- 1.6 4.5 +/- 1.9 MEAN +/- 2 STD DEV 4.7 +/- 3.2 4.6 +/- 2.6 7.2 +/- 4.1 10.4 +/- 5.4 4.0 +/- 1.7 4.6 +/- 2.0 Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01 /06/22 - 04/01 /22 < 188 < 186 < 196 03/03/22 - 04/01 /22 < 195 < 178 < 182 04/07/22 - 06/30/22 < 163 < 180 < 171 < 161 < 170 < 199 07 /07 /22 - 09/29/22 875 +/- 163 < 182 < 189 < 188 < 197 < 173 10/06/22 - 12/15/22 654 +/- 143 < 185 184 +/- 118 202 +/- 127 270 +/- 128 < 187 MEAN+/- 2 STD DEV 765 +/- 313 184 +/- 0 202 +/- 0 270 +/- 0 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-1

Table C-1.3 CONCENTRATIONS OF NICKEL-63 IN SURFACE WATER SAMPLES COLLECTED IN THE VACINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 01 /20/22 - 01 /20/22 (1) < 26 02/17 /22 - 02/24/22 < 22 (1) 03/03/22 - 03/31 /22 < 30 < 25 04/13/22 - 04/28/22 < 18 < 20 05/05/22 - 05/26/22 < 4 < 5 06/02/22 - 06/30/22 < 21 < 21 07/07/22 - 07/28/22 < 25 < 24 08/04/22 - 08/24/22 < 26 < 16 09/01/22 - 09/29/22 < 19 < 23 10/06/22 - 10/27/22 < 17 < 18 11 /03/22 - 11 /23/22 < 17 < 19 12/01/22 - 12/15/22 < 21 < 22 MEAN Table C-1.4 CONCENTRATIONS OF IRON-55 IN SURFACE WATER SAMPLES COLLECTED IN THE VACINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 01/20/22 - 01/20/22 (1) < 48 02/17/22 - 02/24/22 < 63 (1) 03/03/22 - 03/31 /22 < 119 < 172 04/13/22 - 04/28/22 < 147 < 63 05/05/22 - 05/26/22 < 132 < 59 06/02/22 - 06/30/22 < 108 < 83 07/07/22 - 07/28/22 < 112 < 75 08/04/22 - 08/24/22 < 142 < 194 09/01/22 - 09/29/22 < 143 < 103 10/06/22 - 10/27/22 < 91 < 141 11 /03/22 - 11 /23/22 < 77 < 113 12/01/22 - 12/15/22 < 91 < 160 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-2

Table C-1.5 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-10 01/01/22 - 01/31/22 (1) 02/17/22 - 02/24/22 <4 <4 < 7 < 4 < 7 <4 < 7 < 7 < 4 < 4 < 19 < 5 03/03/22 03/31/22 < 4 < 5 < 9 < 5 < 8 < 5 < 8 < 14 < 5 < 4 < 32 < 10 04/07/22 04/28/22 < 3 < 2 < 6 < 3 < 4 < 3 < 5 < 7 < 3 < 3 < 19 < 5 05/05/22 - 05/26/22 < 3 < 4 < 8 < 5 < 11 <4 < 8 < 12 < 5 < 5 < 28 < 10 06/02/22 - 06/30/22 < 6 < 6 < 15 < 6 < 8 <6 < 12 < 11 < 8 < 8 < 23 < 10 07/07/22 - 07/28/22 < 2 < 2 < 4 < 2 < 4 <2 < 4 < 8 < 2 < 2 < 15 < 5 08/04/22 - 08/24/22 < 2 < 2 < 5 < 2 < 4 <2 < 4 < 12 < 2 < 2 < 20 < 6 09/01 /22 - 09/29/22 < 5 < 6 < 14 < 4 < 12 < 6 < 10 < 14 < 6 < 6 < 33 < 12 10/06/22 - 10/27/22 < 2 < 3 < 6 < 3 < 5 < 3 < 5 < 8 < 3 < 2 < 16 < 5 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 8 < 2 < 2 < 16 < 6 12/01 /22 - 12/22/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 17 < 6 MEAN BD-25 01/01/22 - 01/31/22 < 6 < 5 < 10 < 6 < 11 < 6 < 8 < 14 < 5 < 5 < 34 < 12 02/01/22 - 02/28/22 (1) 03/03/22 - 03/31/22 < 4 < 5 < 8 < 5 < 10 < 5 < 7 < 14 < 5 < 5 < 24 < 9 C) 04/13/22 - 04/28/22 < 3 < 3 < 7 < 3 < 7 < 3 < 5 < 10 < 3 < 3 < 23 < 7 I

c,.) < 4 < 4 < 9 05/05/22 05/26/22 <4 < 10 < 5 < 7 < 15 < 5 < 4 < 31 < 11 06/02/22 - 06/30/22 < 6 < 6 < 10 < 7 < 12 < 6 < 8 < 11 < 8 < 7 < 33 < 13 07/07/22 - 07/28/22 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 17 < 5 08/04/22 - 08/24/22 < 2 < 2 < 5 < 2 < 4 < 2 < 3 < 9 < 2 < 2 < 17 < 6 09/01 /22 - 09/29/22 < 6 < 5 < 14 < 6 < 14 < 7 < 11 < 14 < 6 < 6 < 31 < 14 10/06/22 10/27/22 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 10 < 3 < 3 < 21 < 7 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 7 < 2 < 2 < 15 < 5 12/01/22 - 12/15/22 < 1 < 2 < 5 < 2 < 3 < 2 < 3 < 14 < 2 < 2 < 21 < 7 MEAN BD-38 01/13/22 - 01/13/22 < 2 < 2 < 5 < 3 < 5 < 2 < 5 < 13 < 2 < 2 < 24 < 9 02/17/22 - 02/24/22 < 5 < 5 < 14 < 6 < 11 < 5 < 10 < 12 < 5 < 6 < 33 < 12 03/03/22 - 04/01 /22 < 5 < 5 < 10 < 6 < 10 < 5 < 8 < 12 < 5 < 4 < 28 < 8 04/07/22 - 04/28/22 < 4 < 5 < 10 < 4 < 9 < 5 < 7 < 13 < 5 < 4 < 29 < 8 05/05/22 - 05/26/22 < 5 < 5 < 11 < 5 < 11 < 6 < 8 < 14 < 5 < 4 < 31 < 11 06/02/22 - 06/30/22 < 6 < 7 < 13 < 7 < 11 < 7 < 13 < 9 < 7 < 6 < 29 < 9 07107/22 - 07/28/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 17 < 6 08/04/22 - 08/24/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 12 < 2 < 2 < 21 < 8 09/01 /22 - 09/29/22 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 4 < 2 < 2 < 9 < 3 10/06/22 - 10/27/22 < 3 < 3 < 7 < 3 < 5 < 3 < 5 < 8 < 3 < 3 < 17 < 6 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 3 < 4 < 8 < 2 < 2 < 18 < 6 12/01/22 - 12/15/22 < 1 < 2 < 4 < 2 < 3 < 2 < 3 < 15 < 2 < 2 < 21 < 7 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION

Table C-1.5 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-40 01/06/22 - 01/27/22 < 6 < 5 < 14 < 9 < 11 < 7 < 8 < 10 < 6 < 7 < 29 < 11 02/03/22 - 02/24/22 < 5 < 6 < 9 < 6 < 10 < 6 < 9 < 11 < 5 < 5 < 30 < 9 03/03/22 - 04/01 /22 < 5 < 4 < 11 < 5 < 11 < 6 < 9 < 13 < 5 < 5 < 26 < 9 04/07122 - 04/28/22 < 5 < 5 < 11 < 5 < 8 < 5 < 8 < 14 < 5 < 5 < 33 < 10 05/05/22 - 05/26/22 < 5 < 6 < 15 < 6 < 10 < 6 < 10 < 14 < 7 < 6 < 29 < 13 06/02/22 - 06/30/22 < 6 < 7 < 13 < 7 < 16 < 6 < 12 < 10 < 6 < 6 < 25 < 10 07/07/22 - 07/28/22 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 15 < 5 08/04/22 - 08/24/22 < 2 < 3 < 5 < 2 < 5 < 3 < 4 < 11 < 2 < 2 < 20 < 7 09/01 /22 - 09/29/22 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 4 < 2 < 2 < 10 < 3 10/06/22 - 10/27/22 < 3 < 2 < 6 < 3 < 5 < 3 < 5 < 9 < 3 < 3 < 21 < 6 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 8 < 2 < 2 < 17 < 5 12/01/22 - 12/29/22 < 6 < 6 < 15 < 7 < 14 < 7 < 9 < 14 < 6 < 5 < 33 < 10 MEAN BD-55 01/01/22 01/31/22 (1) 02/01 /22 - 02/28/22 (1) 03/03/22 04/01/22 < 5 < 5 < 12 < 5 < 10 < 6 < 9 < 13 < 5 < 4 < 31 < 12

(') 04/07122 - 04/28/22 < 5 < 4 < 10 < 5 < 9 < 5 < 7 < 12 < 5 < 5 < 25 < 12 I

.r:,. 05/05/22 - 05/26/22 < 5 < 5 < 10 < 5 < 14 < 6 < 9 < 14 < 5 < 5 < 31 < 9 06/02/22 - 06/30/22 < 6 < 7 < 11 < 8 < 11 < 6 < 12 < 12 < 8 < 8 < 32 < 9 07/07/22 - 07/28/22 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 7 < 2 < 2 < 14 < 5 08/04/22 - 08/24/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 12 < 2 < 2 < 22 < 7 09/01 /22 - 09/29/22 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 5 < 2 < 2 < 11 < 3 10/06/22 - 10/27/22 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 7 < 3 < 3 < 19 < 6 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 8 < 3 < 2 < 18 < 5 12/01/22 - 12/15/22 < 2 < 2 <4 < 2 < 4 < 2 < 4 < 15 < 2 < 2 < 24 < 7 MEAN BD-56 01/01/22 - 01/31/22 (1) 02/17/22 - 02/17/22 < 4 <4 < 8 < 5 < 9 < 5 < 9 < 13 < 5 < 4 < 34 < 8 03/03/22 - 04/01 /22 < 6 < 5 < 11 < 5 < 11 < 6 < 10 < 14 < 5 < 4 < 29 < 11 04/07/22 - 04/28/22 <4 < 5 < 10 < 5 < 8 < 3 < 7 < 12 < 4 < 5 < 28 < 11 05/05/22 - 05/26/22 < 5 <4 < 10 < 5 < 7 < 4 < 8 < 15 < 5 < 5 < 30 < 10 06/02/22 - 06/30/22 < 6 < 7 < 15 < 7 < 10 < 6 < 11 < 12 < 6 < 7 < 27 < 9 07107/22 - 07/28/22 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 7 < 2 < 2 < 14 < 5 08/04/22 - 08/24/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 16 < 6 09/01/22 - 09/29/22 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 4 < 2 < 2 < 11 < 4 10/06/22 - 10/27/22 < 3 < 3 < 7 < 3 < 5 < 3 < 6 < 9 < 3 < 3 < 19 < 7 11 /03/22 - 11 /23/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 7 < 2 < 2 < 15 < 5 12/01/22 - 12/15/22 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 14 < 2 < 2 < 21 < 6 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION

Table C-I1.1 CONCENTRATIONS OF GROSS BETA IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/30/21 - 01/27/22 < 2.9 01/27/22 - 02/24/22 3.5 +/- 1.7 02/24/22 - 03/31/22 3.2 +/- 1.4 03/31/22 - 04/28/22 < 2.5 04/28/22 - 05/26/22 3.9 +/- 1.6 05/26/22 - 06/30/22 2.9 +/- 1.6 06/30/22 - 07/28/22 < 2.4 07/28/22 - 08/24/22 3.7 +/- 1.9 08/24/22 - 09/29/22 3.1 +/- 1.9 09/29/22 10/27/22 3.2 +/- 1.7 10/27/22 - 11/23/22 5.5 +/- 2.0 11/23/22 - 12/29/22 4.4 +/- 1.7 MEAN +/- 2 STD DEV 3.7 +/- 1.6 Table C-I1.2 CONCENTRATIONS OF TRITIUM IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/30/21 - 01/27/22 < 186 01/27/22 - 02/24/22 < 190 02/24/22 - 03/31/22 551 +/- 141 03/31/22 - 04/28/22 545 +/- 141 04/28/22 - 05/26/22 624 +/- 143 05/26/22 - 06/30/22 < 177 06/30/22 - 07/28/22 337 +/- 127 07/28/22 - 08/24/22 794 +/- 160 08/24/22 - 09/29/22 1240 +/- 192 09/29/22 - 10/27/22 1540 +/- 234 10/27/22 - 11/23/22 3050 +/- 390 11/23/22 - 12/29/22 1880 +/- 178 MEAN +/- 2 STD DEV 1173 +/- 1745 Table C-I1.3 CONCENTRATIONS OF I-131 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/30/21 - 01/27/22 < 0.9 01/27/22 - 02/24/22 < 0.6 02/24/22 - 03/31/22 < 0.9 03/31/22 - 04/28/22 < 0.7 04/28/22 - 05/26/22 < 0.9 05/26/22 - 06/30/22 < 0.9 06/30/22 - 07/28/22 < 0.9 07/28/22 - 08/24/22 < 0.9 08/24/22 - 09/29/22 < 0.9 09/29/22 - 10/27/22 < 0.9 10/27/22 11/23/22 < 0.9 11/23/22 12/29/22 < 0.9 MEAN THE MEAN AND TWO STANDARD DEV/AT/ON ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS FOR EXPLANA T/ON C-5

Table C-11.4 CONCENTRATIONS OF NICKEL-63 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/30/21 - 01/27/22 < 29 01 /27/22 - 02/24/22 < 24 02/24/22 - 03/31 /22 < 26 03/31 /22 - 04/28/22 64 +/- 24 04/28/22 - 05/26/22 < 24 05/26/22 - 06/30/22 < 26 06/30/22 - 07 /28/22 < 17 07 /28/22 - 08/24/22 < 22 08/24/22 - 09/29/22 < 19 09/29/22 - 10/27/22 < 20 10/27/22 - 11/23/22 < 22 11 /23/22 - 12/29/22 < 26 MEAN +/- 2 STD DEV 64 +/- 0 Table C-11.5 CONCENTRATIONS OF IRON-55 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/30/21 - 01/27/22 < 81 01 /27 /22 - 02/24/22 < 121 02/24/22 - 03/31/22 < 166 03/31 /22 - 04/28/22 < 86 04/28/22 - 05/26/22 < 133 05/26/22 - 06/30/22 < 51 06/30/22 - 07/28/22 < 76 07 /28/22 - 08/24/22 < 191 08/24/22 - 09/29/22 < 96 09/29/22 - 10/27/22 < 187 10/27/22 - 11/23/22 < 68 11/23/22 - 12/29/22 < 184 MEAN THE MEAN AND TWO STANDARD DEV/A TION ARE CALCULATED USING THE POSITIVE VALUES C-6

Table C-11.6 CONCENTRATIONS OF GAMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-22 12/30/21 - 01/27/22 < 1 < 1 < 3 < 1 < 2 < 1 < 3 < 1 < 1 < 12 < 4 01/27/22 - 02/24/22 <4 < 6 < 7 <4 < 10 < 5 < 10 < 4 < 5 < 29 < 12 02/24/22 - 03/31 /22 < 1 < 1 < 3 < 1 < 2 < 1 < 2 < 1 < 1 < 11 < 3 03/31 /22 - 04/28/22 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 2 < 2 < 15 < 5 04/28/22 - 05/26/22 < 1 < 2 <4 < 2 < 3 < 2 < 3 <2 <2 < 14 < 4 05/26/22 - 06/30/22 <4 <4 < 9 < 4 < 8 < 4 < 6 <4 <4 < 26 < 7 06/30/22 - 07128/22 < 1 < 2 < 4 < 2 < 3 < 2 < 3 < 2 < 2 < 16 < 5 07128122 - 08/24/22 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 18 < 6 08/24/22 - 09/29/22 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 2 <2 < 11 < 4 09/29/22 - 10/27/22 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 2 < 2 < 15 < 5 10/27/22 - 11/23/22 < 2 <2 <4 < 1 < 3 < 2 < 3 < 2 < 2 < 18 < 6 11 /23/22 - 12/29/22 < 5 < 5 < 10 < 5 < 10 < 5 < 10 < 5 < 5 < 31 < 9

() MEAN I

--.J

Table C-111.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-13 BD-34 BD-35 BD-36 BD-37 BD-50 BD-51 BD-54 01/13/22 - 01/13/22 < 185 < 173 < 186 < 163 < 151 < 168 < 186 < 176 04/13/22 - 04/13/22 < 174 198 +/- 130 < 175 < 184 < 198 < 185 < 196 < 196 07/14/22 - 07/14/22 < 170 < 176 < 185 < 193 < 184 < 174 < 190 < 193 10/13/22 - 10/13/22 < 182 < 180 < 199 < 191 < 192 < 185 < 186 < 189 MEAN 198 +/- 0 C-8

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-13 01/13/22 - 01/13/22 < 6 < 6 < 11 < 7 < 12 < 8 < 12 < 9 < 6 < 7 < 27 < 9 04/13/22 - 04/13/22 < 5 < 5 < 10 < 5 < 10 < 6 < 11 < 10 < 6 < 5 < 24 < 8 07/14/22 - 07/14/22 < 6 < 7 < 13 < 6 < 10 < 7 < 10 < 10 < 8 < 6 < 25 < 10 10/13/22 - 10/13/22 < 8 < 8 < 17 < 8 < 16 < 8 < 12 < 12 < 7 < 7 < 35 < 9 MEAN BD-34 01/13/22 - 01/13/22 < 5 < 6 < 11 < 9 < 12 < 7 < 10 < 9 < 6 < 5 < 29 < 10 04/13/22 - 04/13/22 < 6 < 6 < 13 < 6 < 13 < 6 < 12 < 10 < 7 < 6 < 33 < 10 07/14/22 - 07/14/22 < 5 < 6 < 14 < 6 < 14 < 7 < 9 < 8 < 7 < 6 < 29 < 11 10/13/22 - 10/13/22 < 6 < 8 < 14 < 6 < 17 < 7 < 13 < 9 < 7 < 7 < 36 < 8 MEAN

(')

I tO BD-35 01/13/22 - 01/13/22 < 6 < 8 < 11 < 5 < 12 < 5 < 11 < 12 < 6 < 7 < 31 < 11 04/13/22 - 04/13/22 < 5 < 5 < 11 < 4 < 10 < 4 < 6 < 9 < 5 < 5 < 21 < 7 07/14/22 - 07/14/22 < 8 < 7 < 19 < 7 < 17 < 7 < 14 < 9 < 7 < 8 < 33 < 8 10/13/22 10/13/22 < 4 < 6 < 9 < 5 < 9 < 5 < 8 < 7 < 5 < 5 < 21 < 7 MEAN BD-36 01/13/22 - 01/13/22 < 7 < 6 < 14 < 7 < 15 < 9 < 12 < 12 < 7 < 7 < 32 < 8 04/13/22 - 04/13/22 < 7 < 6 < 17 < 6 < 15 < 8 < 12 < 11 < 6 < 7 < 30 < 12 07/14/22 - 07/14/22 < 5 < 6 < 7 < 5 < 8 < 5 < 8 < 9 < 6 < 6 < 28 < 10 10/13/22 - 10/13/22 < 9 < 8 < 18 < 11 < 15 < 8 < 14 < 14 < 9 < 8 < 37 < 9 MEAN BD-37 01/13/22 - 01/13/22 < 4 < 4 < 9 < 4 < 9 < 5 < 7 < 7 < 5 < 4 < 23 < 8 04/13/22 - 04/13/22 < 4 < 5 < 9 < 4 < 7 < 6 < 10 < 7 < 6 < 5 < 25 < 8 07/14/22 - 07/14/22 < 7 < 7 < 17 < 8 < 11 < 7 < 10 < 11 < 8 < 6 < 28 < 11 10/13/22 - 10/13/22 < 6 < 6 < 11 < 6 < 10 < 7 < 12 < 9 < 6 < 5 < 32 < 5 MEAN

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-50 01/13/22 - 01/13/22 < 5 < 5 < 11 < 4 < 9 < 6 < 8 < 8 < 7 < 6 < 23 < 5 04/13/22 - 04/13/22 < 5 < 5 < 12 < 5 < 11 < 7 < 9 < 9 < 5 < 6 < 28 < 8 07/14/22 - 07/14/22 < 6 < 6 < 10 < 7 < 8 < 6 < 11 < 9 < 7 < 6 < 28 < 7 10/13/22 - 10/13/22 < 7 < 5 < 12 < 6 < 14 < 7 < 11 < 8 < 8 < 7 < 25 < 10 MEAN BD-51 01/13/22 - 01/13/22 < 6 < 5 < 11 < 5 < 11 < 6 < 9 < 9 < 5 < 5 < 25 < 10 04/13/22 - 04/13/22 < 6 < 6 < 16 < 9 < 12 < 7 < 16 < 12 < 8 < 6 < 34 < 11 07/14/22 - 07/14/22 < 6 < 7 < 8 < 7 < 14 < 5 < 13 < 8 < 7 < 7 < 27 < 10 10/13/22 - 10/13/22 < 4 < 4 < 9 < 5 < 9 < 4 < 6 < 6 < 5 < 4 < 16 < 7 MEAN

(")

....0 I

BD-54 01/13/22 - 01/13/22 < 7 < 7 < 14 < 5 < 15 < 8 < 11 < 11 < 7 < 7 < 37 < 9 04/13/22 - 04/13/22 < 4 < 4 < 10 < 5 < 7 < 6 < 9 < 9 < 6 < 5 < 24 < 8 07/14/22 - 07/14/22 < 8 < 6 < 15 < 5 < 16 < 7 < 15 < 12 < 6 < 7 < 38 < 10 10/13/22 - 10/13/22 < 4 < 4 < 7 < 4 < 8 < 4 < 8 < 7 < 4 < 5 < 19 < 5 MEAN

Table C-IV.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Fe-55 Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-25 Smal/mouth Bass 05/04/22 < 255 < 220 < 48 < 51 < 104 < 50 < 112 < 47 < 70 < 92 < 61 < 49 < 248 < 64 Golden Redhorse 05104122 < 147 < 238 < 58 < 47 < 97 < 20 < 130 < 50 < 109 < 96 < 42 < 41 < 262 < 100 Smallmouth Bass 10112/22 < 254 < 243 < 40 < 48 < 121 < 46 < 106 < 60 < 112 < 118 < 66 < 46 < 263 < 111 Shorthead Redhorse 10112122 < 190 < 182 < 52 < 47 < 113 < 57 < 122 < 73 < 91 < 126 < 71 < 58 < 306 < 93 MEAN BD-28 Golden Redhorse 05104122 < 156 < 244 < 72 < 39 < 133 < 44 < 158 < 57 < 110 < 101 < 54 < 46 < 276 < 68 Smallmouth Bass 05104122 < 73 < 260 < 58 < 43 < 111 < 59 < 126 < 48 < 68 < 90 < 53 < 54 < 278 < 79

(') Golden Redhorse 10112/22 < 156 < 238 < 33 < 29 < 72 < 31 < 71 < 36 < 50 < 60 < 37 < 28 < 175 < 71 I

..... Smallmouth Bass 10/12/22 < 236 < 126 < 50 < 52 < 105 < 52 < 133 < 82 < 114 < 104 < 50 < 56 < 313 < 109 MEAN BD-41 Common Carp 05/04/22 < 148 < 200 < 49 < 51 < 131 < 65 < 99 < 53 < 85 < 82 < 59 < 41 < 257 < 57 Largemouth Bass 05/04/22 < 90 < 209 < 56 < 62 < 125 < 56 < 136 < 58 < 114 < 116 < 66 < 61 < 310 < 79 Common Carp 10/12/22 < 220 < 183 < 32 < 31 < 77 < 38 < 74 < 34 < 60 < 63 < 35 < 36 < 183 < 62 Largemouth Bass 10/12/22 < 252 < 117 < 35 < 42 < 98 < 43 < 91 < 40 < 69 < 87 < 44 < 41 < 244 < 67 MEAN

Table C-V.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG DRY+/- 2 SIGMA COLLECTION SITE PERIOD Fe-55 Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-10 05/17/22 < 1949 < 185 < 62 < 64 < 132 < 70 < 136 < 76 < 129 < 97 157 +/- 57 < 328 < 130 10/29/22 < 1103 < 259 < 78 < 81 < 182 < 105 < 217 < 118 < 155 < 104 < 104 < 344 < 130 MEAN 157 +/- 0 BD-25 05/17/22 < 1986 < 192 < 82 < 78 < 189 < 103 < 154 < 103 < 112 < 107 < 102 < 407 < 99 10/29/22 < 792 < 249 < 80 < 64 < 166 < 81 < 149 < 77 < 120 < 81 < 96 < 311 < 97 MEAN BD-57 05/17/22 < 1949 < 176 < 95 < 89 < 238 < 113 < 181 < 98 < 166 < 112 < 108 < 451 < 165 10/29/22 < 1376 < 211 < 71 < 56 < 136 < 71 < 125 < 67 < 117 < 76 < 89 < 274 < 99

(') MEAN I

...lo.

I\)

BD-SPOIL-1 09/22/22 < 1243 < 218 < 75 < 88 < 201 < 80 < 205 < 104 < 171 < 106 < 96 < 407 < 118 MEAN BD-SPOIL-2 10/06/22 < 965 < 169 < 86 < 81 < 163 < 83 < 153 < 89 < 158 < 104 < 90 < 454 < 92 MEAN

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP Ill-GROUP I - NEAR FIELD GROUP II - FAR FIELD COLLECTION CONTROL PERIOD BD-06 BD-19 BD-20 BD-21 BD-02 BD-04 BD-05 BD-03 12/30/21 - 01/06/22 32 +/- 5 30 +/- 5 33 +/- 5 34 +/- 5 29 +/-5 26 +/- 5 27 +/- 5 28 +/- 5 01/06/22 - 01/13/22 29 +/- 5 27 +/- 5 30 +/- 5 30 +/- 5 26 +/- 5 29 +/- 5 29 +/- 5 30 +/- 5 01/13/22 01/20/22 22 +/- 5 25 +/- 5 28 +/- 5 27 +/- 5 20 +/- 4 25 +/- 5 20 +/- 5 24 +/- 5 01/20/22 - 01/27/22 21 +/- 5 27 +/- 5 24 +/- 5 26 +/- 5 24 +/- 5 23 +/-5 19 +/- 4 24 +/- 5 01/27/22 - 02/03/22 26 +/- 5 25 +/- 5 23 +/- 5 24 +/- 3 24 +/- 5 20 +/- 5 20 +/- 5 20 +/- 5 02/03/22 - 02/10/22 25 +/- 5 26 +/- 5 30 +/- 5 (1) 31 +/- 5 31 +/- 5 28 +/- 5 31 +/- 5 02/10/22 - 02/17 /22 16 +/- 4 17 +/- 4 23 +/- 5 17 +/- 5 21 +/- 5 17 +/- 4 16 +/- 4 20 +/- 5 02/17 /22 - 02/24/22 21 +/- 4 18 +/- 4 22 +/- 5 20 +/- 4 20 +/- 4 21 +/- 4 22 +/- 5 19 +/- 4 02/24/22 - 03/03/22 24 +/- 5 22 +/- 5 20 +/- 5 22 +/- 5 25 +/- 5 24 +/- 5 22 +/- 5 23 +/- 5 03/03/22 - 03/09/22 15 +/- 5 12 +/- 5 11 +/- 5 12 +/- 5 13 +/- 5 14 +/- 5 11 +/- 5 11 +/- 5 03/09/22 - 03/17/22 19 +/- 4 25 +/- 4 22 +/- 4 23 +/- 4 20 +/- 4 19 +/-4 18 +/- 4 19 +/- 4 03/17/22 - 03/24/22 15 +/- 4 17 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 03/24/22 - 03/31 /22 10 +/- 4 8 +/- 3 12 +/-4 11 +/- 4 9 +/- 4 9 +/- 3 11 +/- 4 14 +/- 4 03/31/22 - 04/07/22 10 +/- 4 10 +/- 4 14 +/- 4 12 +/- 4 11 +/- 4 12 +/- 4 9 +/- 4 9 +/- 4 04/07122 - 04/13/22 9 +/- 4 10 +/- 5 14 +/- 5 9 +/- 4 12 +/- 5 10 +/- 5 8 +/- 5 13 +/- 5 04/13/22 - 04/21/22 12 +/- 3 14 +/- 4 9 +/- 3 14 +/- 3 10 +/- 3 13 +/- 4 12 +/- 3 11 +/- 3 04/21/22 - 04/28/22 14 +/- 4 15 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 13 +/- 4 18 +/- 4 04/28122 - 05/05/22 12 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 11 +/-4 9 +/- 4 13 +/- 4 05/05/22 - 05/12/22 15 +/- 4 14 +/- 4 19 +/- 5 18 +/- 5 12 +/- 4 18 +/- 5 16 +/- 4 18 +/- 5 05/12/22 - 05/19/22 17 +/- 4 18 +/- 4 18 +/- 4 21 +/- 5 18 +/- 4 19 +/-4 16 +/- 4 21 +/- 5 05/19/22 - 05/26/22 11 +/- 4 15 +/- 4 13 +/- 4 10 +/- 4 13 +/- 4 16 +/- 4 7 +/- 4 13 +/- 4 05/26/22 - 06/02/22 12 +/- 4 12 +/- 4 18 +/- 5 16 +/- 4 14 +/- 5 19 +/- 5 11 +/- 4 20 +/- 5 06/02/22 - 06/09/22 20 +/- 4 20 +/- 4 23 +/- 5 22 +/- 5 20 +/- 4 23 +/- 5 18 +/- 4 18 +/- 4 06/09122 - 06/16/22 24 +/- 5 22 +/- 5 25 +/- 5 21 +/- 4 23 +/- 5 24 +/- 5 20 +/- 5 25 +/- 5 06116122 - 06123122 12 +/- 4 13 +/- 4 10 +/- 4 12 +/- 4 11 +/- 4 15 +/-4 10 +/- 4 11 +/- 4 06123122 - 06130122 14 +/- 4 10 +/- 4 10 +/- 4 11 +/- 4 12 +/- 5 9 +/-4 8 +/- 4 11 +/- 4 06130122 - 07107122 18 +/- 5 22 +/- 5 23 +/- 5 18 +/- 5 20 +/- 5 22 +/- 5 18 +/- 5 22 +/- 5 07107/22 - 07114/22 17 +/- 4 18 +/- 5 19 +/- 5 17 +/- 4 16 +/- 4 14 +/- 4 12 +/- 4 16 +/- 4 07/14122 - 07121/22 21 +/- 5 21 +/- 5 24 +/- 5 22 +/- 5 25 +/- 5 25 +/- 5 19 +/- 5 27 +/- 5 07121122 - 07/28122 18 +/- 4 13 +/- 4 20 +/- 5 17 +/- 4 17 +/- 4 19 +/- 5 14 +/- 4 17 +/- 4 07128122 - 08104122 16 +/- 4 14 +/- 4 16 +/- 5 15 +/- 4 17 +/- 5 15 +/- 5 12 +/- 5 15 +/- 5 08104122 - 08111122 15 +/- 4 18 +/- 4 15 +/- 4 18 +/- 4 16 +/-4 18 +/- 4 13 +/- 3 17 +/- 4 08111122 - 08118122 17 +/- 4 24 +/- 5 17 +/- 4 22 +/- 5 19 +/-5 22 +/-5 17 +/- 4 20 +/- 5 08118122 - 08124122 21 +/- 5 20 +/- 5 21 +/- 5 21 +/- 5 19 +/- 5 23 +/- 6 16 +/- 5 25 +/- 6 08124122 - 09101122 24 +/- 4 21 +/- 4 25 +/- 4 21 +/- 4 21 +/- 4 22 +/- 4 20 +/- 4 23 +/- 4 09101122 - 09108122 17 +/- 4 23 +/- 5 19 +/- 4 18 +/- 4 18 +/- 4 20 +/- 4 18 +/- 4 19 +/- 4 09108122 - 09/15122 21 +/- 5 25 +/- 5 25 +/- 5 21 +/- 4 23 +/- 5 21 +/- 4 21 +/- 4 26 +/- 5 09115122 - 09/22122 27 +/- 5 24 +/- 5 26 +/- 5 27 +/- 5 27 +/- 5 33 +/- 5 22 +/- 5 25 +/- 5 09122122 - 09129122 12 +/- 4 11 +/- 4 17 +/- 5 11 +/- 4 12 +/- 4 10 +/- 4 10 +/- 4 14 +/- 4 09129122 - 10106122 19 +/- 4 17 +/- 4 17 +/-4 19 +/- 4 18 +/- 4 22 +/- 4 14 +/- 4 (1) 10106122 - 10113122 27 +/- 5 25 +/- 5 34 +/-6 25 +/- 5 29 +/- 5 29 +/- 5 21 +/- 5 26 +/- 5 10113122 - 10120122 11 +/- 4 13 +/- 4 12 +/-4 14 +/- 4 11 +/- 4 12 +/- 4 8 +/- 4 17 +/- 8 10/20122 - 10/27/22 30 +/- 5 31 +/- 5 33 +/- 5 31 +/- 5 28 +/- 5 33 +/- 5 32 +/- 5 (1) 10/27/22 - 11/03/22 39 +/- 6 39 +/- 6 36 +/- 6 41 +/- 6 36 +/- 6 38 +/- 6 40 +/- 6 (1) 11103122 - 11/10122 28 +/- 5 23 +/- 4 25 +/- 5 30 +/- 5 26 +/- 5 27 +/- 5 26 +/- 4 (1) 11110122 - 11117122 11 +/- 4 12 +/- 4 9 +/- 4 8 +/- 4 7 +/- 4 12 +/- 4 11 +/- 4 < 11 11117122 - 11123122 36 +/- 6 33 +/- 6 30 +/- 6 30 +/- 6 33 +/- 6 32 +/-6 30 +/- 5 31 +/- 5 11123122 - 12101122 37 +/- 5 30 +/- 5 32 +/- 5 31 +/- 5 29 +/- 5 38 +/- 5 28 +/- 5 33 +/- 5 12101122 - 12108122 38 +/- 6 35 +/- 6 37 +/-6 37 +/- 6 28 +/- 5 37 +/-6 34 +/- 5 29 +/- 5 12/08122 - 12/15122 21 +/- 4 25 +/- 5 18 +/-4 21 +/- 4 21 +/- 4 21 +/- 4 19 +/- 4 25 +/- 5 12/15122 - 12122/22 27 +/- 5 22 +/- 4 30 +/- 5 28 +/- 5 28 +/- 5 25 +/- 5 30 +/- 5 30 +/- 5 12/22122 - 12129/22 25 +/- 5 36 +/- 7 21 +/- 5 21 +/- 4 23 +/- 5 21 +/- 5 24 +/- 5 19 +/- 4 MEAN+/- 2 STD DEV 20 +/- 16 20 +/- 15 21 +/- 15 20 +/- 15 20 +/- 14 21 +/- 15 18 +/- 15 20 +/- 13 THE MEAN ANO TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-13

Table C-Vl.2 MONTHLY AND YEARLY VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP 1- NEAR FIELD LOCATIONS GROUP II - FAR FIELD LOCATIONS GROUP Ill - CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/- 2SD PERIOD +/-2SD PERIOD +/- 2SD 12/30/21 - 01/27/22 21 34 28 +/- 7 12/30/21 - 01/27/22 19 29 25 +/- 7 12/30/21 - 01/27/22 24 30 27 +/- 6 01 /27 /22 - 03/03/22 16 30 22 +/- 7 01 /27 /22 - 03/03/22 16 31 23 +/- 9 01 /27 /22 - 03/03/22 19 31 23 +/- 10 03/03/22 - 03/24/22 11 25 17 +/- 9 03/03/22 - 03/24/22 11 20 15 +/- 6 03/03/22 - 03/24/22 11 19 15 +/- 8 03/24/22 - 04/28/22 8 16 12 +/- 5 03/24/22 - 04/28/22 8 15 11 +/- 4 03/24/22 - 04/28/22 9 18 13 +/- 7 04/28/22 - 06/02/22 10 21 15 +/- 7 04/28/22 - 06/02/22 7 19 14 +/- 7 04/28/22 - 06/02/22 13 21 17 +/- 8 06/02/22 - 06/30/22 10 25 17 +/- 11 06/02/22 - 06/30/22 8 24 16 +/- 12 06/02/22 - 06/30/22 11 25 16 +/- 14 06/30/22 - 08/04/22 13 24 18 +/- 6 06/30/22 - 08/04/22 12 25 18 +/- 8 06/30/22 - 08/04/22 15 27 19 +/- 10 08/04/22 - 09/01/22 15 25 20 +/- 6 08/04/22 - 09/01 /22 13 23 19 +/- 6 08/04/22 - 09/01 /22 17 25 21 +/- 6 09/01/22 - 09/29/22 11 27 20 +/- 11 09/01 /22 - 09/29/22 10 33 20 +/- 13 09/01 /22 - 09/29/22 14 26 21 +/- 11 09/29/22 - 11 /03/22 11 41 26 +/- 20 09/29/22 - 11 /03/22 8 40 25 +/- 21 10/06/22 - 10/20/22 17 26 21 +/- 13 11 /03/22 - 12/01 /22 8 37 25 +/- 19 11 /03/22 - 12/01 /22 7 38 25 +/- 19 11/17/22 - 12/01/22 31 33 32 +/- 3

(')

I 12/01 /22 12/29/22 18 38 28 +/- 14 12/01 /22 - 12/29/22 19 37 26 +/- 11 12/01 /22 - 12/29/22 19 30 26 +/- 10

~

.i::,.

12/30/21 - 12/29/22 8 41 20 +/- 15 12/30/21 - 12/29/22 7 40 20 +/- 15 12/30/21 12/29/22 9 33 20 +/- 13 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-02 12/30/21 - 03/24/22 < 3 < 3 < 3 < 3 < 5 < 3 < 4 < 2 < 2 < 36 < 16 03/24/22 - 06/30/22 < 3 < 3 < 6 < 4 < 6 < 3 < 7 < 3 < 3 < 19 < 5 06/30/22 - 09/29/22 < 3 < 4 < 6 < 4 < 11 < 5 < 6 < 3 < 4 < 39 < 22 09/29/22 - 12/29/22 < 3 < 3 < 6 < 2 < 7 < 3 < 7 < 3 < 3 < 26 < 7 MEAN BD-03 12/30/21 - 03/24/22 < 2 < 4 < 9 < 2 < 7 < 4 < 7 < 3 < 3 < 62 < 16 03/24/22 - 06/30/22 < 3 < 4 < 8 < 4 < 7 < 3 < 6 < 2 < 3 < 21 < 9 06/30/22 - 09/29/22 < 2 < 2 < 6 < 3 < 6 < 2 < 4 < 2 < 2 < 28 < 10 10/06/22 - 12/29/22 < 2 < 3 < 8 < 3 < 7 < 3 < 5 < 2 < 2 < 32 < 11 MEAN

{")

I c.n BD-04 12/30/21 - 03/24/22 < 4 < 5 < 13 < 5 < 10 < 5 < 8 <4 < 4 < 97 < 33 03/24/22 - 06/30/22 < 2 < 2 < 4 < 2 < 5 < 2 < 4 < 2 < 2 < 11 < 3 06/30/22 - 09/29/22 < 2 < 2 < 5 < 2 < 3 < 3 < 4 <2 < 2 < 16 < 7 09/29/22 - 12/29/22 < 2 < 3 < 4 < 2 < 7 < 3 < 4 <2 < 3 < 15 < 10 MEAN BD-05 12/30/21 - 03/24/22 < 2 < 3 < 7 < 2 < 6 < 4 < 6 < 2 < 2 < 57 < 18 03/24/22 - 06/30/22 < 3 < 3 < 5 < 3 < 6 < 3 < 5 < 3 < 2 < 17 < 7 06/30/22 - 09/29/22 < 2 < 2 < 5 < 1 < 4 < 2 < 3 < 2 < 1 < 18 < 9 09/29/22 - 12/29/22 < 2 < 2 < 5 < 2 < 6 < 2 < 4 < 2 < 2 < 16 < 8 MEAN BD-06 12/30/21 - 03/24/22 < 2 < 3 < 8 < 2 < 5 < 3 < 6 < 2 < 2 < 51 < 9 03/24/22 - 06/30/22 < 1 < 1 < 2 < 2 < 3 < 1 < 2 < 1 < 1 < 7 < 2 06/30/22 - 09/29/22 < 3 < 2 < 6 < 2 < 5 < 2 < 4 < 2 < 2 < 24 < 10 09/29/22 - 12/29/22 < 2 < 2 < 6 < 2 < 5 < 3 < 4 < 2 < 2 < 19 < 8 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-19 12/30/21 - 03/24/22 < 2 <4 < 8 < 2 < 6 < 2 < 6 < 3 < 2 < 54 < 15 03/24/22 - 06/30/22 < 2 < 2 < 5 < 2 < 5 < 2 < 5 < 3 < 2 < 14 < 7 06/30/22 - 09/29/22 < 2 < 2 < 5 < 1 < 5 < 3 < 2 < 2 < 2 < 19 < 12 09/29/22 - 12/29/22 < 2 < 2 < 7 < 3 < 5 < 2 < 4 < 2 < 2 < 21 < 9 MEAN BD-20 12/30/21 - 03/24/22 < 2 < 3 < 7 < 3 < 6 < 3 < 5 < 3 < 2 < 42 < 16 03/24/22 - 06/30/22 < 2 < 1 < 4 < 1 < 6 < 2 < 4 < 2 < 1 < 9 < 5 06/30/22 - 09/29/22 < 1 < 2 < 4 < 2 < 5 < 2 < 4 < 2 < 2 < 20 < 11 09/29/22 - 12/29/22 < 2 < 4 < 8 < 4 < 6 < 3 < 5 < 3 < 3 < 23 < 4 MEAN

(')

I a,

BD-21 12/30/21 - 03/24/22 < 2 < 2 < 6 < 2 < 6 < 3 < 5 < 3 < 2 < 60 < 26 03/24/22 - 06/30/22 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 3 < 2 < 18 < 8 06/30/22 - 09/29/22 < 2 < 3 < 5 < 1 < 4 < 1 < 3 < 2 < 2 < 20 < 10 09/29/22 - 12/29/22 < 1 < 2 < 5 < 3 < 5 < 3 < 4 < 2 < 2 < 13 < 6 MEAN

Table C-Vll.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP Ill-GROUP I - NEAR FIELD GROUP II - FAR FIELD COLLECTION CONTROL PERIOD BD-06 BD-19 BD-20 BD-21 BD-02 BD-04 BD-05 BD-03 12/30/21 - 01/06/22 < 34 < 35 < 35 < 33 < 34 < 33 < 15 < 36 01/06/22 - 01/13/22 < 58 < 58 < 57 < 58 < 61 < 62 < 64 < 64 01/13/22 - 01/20/22 < 30 < 29 < 31 < 29 < 34 < 33 < 34 < 35 01/20/22 - 01/27/22 < 32 < 34 < 34 < 32 < 36 < 36 < 35 < 37 01/27/22 - 02/03122 < 25 < 26 < 23 < 24 < 30 < 25 < 25 < 30 02/03/22 - 02/10/22 < 48 < 52 < 51 (1) < 37 < 35 < 37 < 39 02/10/22 - 02/17/22 < 35 < 36 < 36 < 36 < 35 < 35 < 35 < 36 02/17/22 - 02124/22 < 32 < 34 < 34 < 32 < 45 < 44 < 45 < 45 02/24/22 - 03/03/22 < 44 < 47 < 46 < 44 < 36 < 34 < 36 < 37 03/03/22 - 03/09/22 < 41 < 42 < 43 < 41 < 40 < 40 < 40 < 41 03/09/22 - 03/17/22 < 31 < 31 < 31 < 30 < 28 < 29 < 30 < 28 03/17/22 03/24/22 < 28 < 29 < 29 < 29 < 24 < 26 < 16 < 26 03/24/22 03/31/22 < 20 < 21 < 21 < 20 < 24 < 20 < 25 < 24 03/31/22 - 04/07/22 < 61 < 62 < 63 < 62 < 34 < 39 < 35 < 29 04/07/22 - 04/13/22 < 39 < 41 < 40 < 33 < 56 < 59 < 59 < 56 04/13/22 - 04/21/22 < 29 < 29 < 29 < 28 < 29 < 29 < 29 < 28 04/21/22 - 04/28/22 < 36 < 38 < 37 < 36 < 31 < 30 < 31 < 30 04/28/22 - 05/05/22 < 46 < 46 < 46 < 45 < 29 < 28 < 30 < 29 05105/22 05/12/22 < 32 < 33 < 33 < 32 < 28 < 29 < 28 < 28 05/12/22 - 05/19/22 < 30 < 31 < 31 < 26 < 31 < 31 < 31 < 31 05/19/22 - 05/26/22 < 46 < 46 < 47 < 44 < 48 < 50 < 50 < 48 05/26/22 - 06/02/22 < 44 < 47 < 47 < 44 < 47 < 42 < 45 < 45 06/02/22 - 06/09/22 < 52 < 57 < 57 < 57 < 51 < 46 < 51 < 52 06/09/22 - 06/16/22 < 53 < 55 < 58 < 53 < 53 < 52 < 52 < 52 06/16/22 06/23/22 < 37 < 38 < 38 < 36 < 46 < 47 < 46 < 46 06/23/22 - 06/30/22 < 22 < 54 < 54 < 54 < 53 < 50 < 53 < 53 06/30/22 - 07107/22 < 40 < 41 < 41 < 40 < 24 < 24 < 24 < 24 07107/22 - 07/14/22 < 36 < 37 < 37 < 36 < 33 < 32 < 33 < 33 07/14/22 - 07/21 /22 < 43 < 45 < 44 < 43 < 43 < 44 < 43 < 43 07/21/22 07/28/22 < 47 < 47 < 49 < 19 < 27 < 27 < 27 < 27 07/28/22 08/04/22 < 16 < 39 < 39 < 38 < 60 < 58 < 62 < 62 08/04/22 - 08/11/22 < 33 < 34 < 34 < 32 < 31 < 31 < 30 < 30 08/11/22 - 08/18/22 < 49 < 50 < 51 < 50 < 53 < 52 < 53 < 52 08/18/22 - 08/24/22 < 39 < 41 < 40 < 39 < 43 < 43 < 43 < 44 08/24/22 - 09/01 /22 < 58 < 55 < 55 < 54 < 60 < 58 < 60 < 27 09/01/22 09/08/22 < 52 < 53 < 53 < 22 < 38 < 40 < 38 < 39 09/08/22 - 09/15/22 < 52 < 51 < 51 < 49 < 38 < 38 < 38 < 38 09/15/22 09/22/22 < 58 < 57 < 58 < 56 < 62 < 61 < 62 < 62 09/22/22 - 09/29/22 < 48 < 50 < 50 < 48 < 50 < 49 < 50 < 52 09/29/22 - 10/06/22 < 48 < 18 < 18 < 17 < 48 < 47 < 20 (1) 10/06/22 - 10/13/22 < 35 < 34 < 34 < 33 < 29 < 32 < 30 < 30 10/13/22 - 10/20/22 < 25 < 47 < 47 < 46 < 25 < 25 < 26 < 25 10/20/22 - 10/27/22 < 20 < 46 < 33 < 32 < 44 < 47 < 45 (1) 10/27/22 - 11/03/22 < 42 < 43 < 37 < 35 < 21 < 42 < 43 (1) 11/03/22 - 11/10/22 < 22 < 51 < 22 < 22 < 50 < 50 < 46 (1) 11/10/22 11/17/22 < 33 < 32 < 33 < 32 < 36 < 37 < 37 < 40 11/17/22 - 11/23/22 < 46 < 47 < 47 < 46 < 48 < 48 < 45 < 45 11/23/22 - 12/01/22 < 27 < 20 < 20 < 20 < 27 < 26 < 12 < 26 12/01/22 - 12/08/22 < 36 < 36 < 36 < 35 < 38 < 40 < 37 < 18 12/08/22 - 12/15/22 < 53 < 52 < 53 < 50 < 35 < 35 < 35 < 34 12/15/22 - 12/22/22 < 54 < 56 < 56 < 52 < 34 < 33 < 32 < 32 12/22/22 - 12/29/22 < 53 < 32 < 53 < 52 < 51 < 52 < 53 < 49 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANA TJON C-17

Table C-Vlll.1 CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD BD-18 04/07/22 < 0.9 MEAN Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-18 04/07/22 < 8 < 7 < 21 < 8 < 21 < 7 < 13 < 7 < 9 < 53 < 10 C')

I

~

MEAN 00 Table C-Vlll.3 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RES ULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 No Substitute Grass Samples Taken in 2022

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BO-CONTROL Radish 06/16/22 < 32 < 31 < 50 < 38 < 68 < 33 < 56 < 38 < 32 < 32 < 118 < 47 Lettuce 06/16/22 < 29 < 26 < 76 < 41 < 76 < 28 < 36 < 37 < 29 < 37 < 119 < 42 Turnip 07/13/22 < 34 < 30 < 57 < 46 < 75 < 35 < 55 < 55 < 39 < 33 < 143 < 40 Mustard Greens 07/13/22 < 37 < 28 < 97 < 42 < 120 < 45 < 68 < 53 < 44 < 40 < 163 < 39 Turnip 07/13/22 < 34 < 30 < 57 < 46 < 75 < 35 < 55 < 55 < 39 < 33 < 143 < 40 Mustard Greens 07/13/22 < 37 < 28 < 97 < 42 < 120 < 45 < 68 < 53 < 44 < 40 < 163 < 39 Lettuce 07/28/22 < 30 < 31 < 52 < 33 < 60 < 32 < 51 < 46 < 32 < 30 < 142 < 46 Radish 07/28/22 < 34 < 31 < 61 < 34 < 57 < 23 < 42 < 43 < 26 < 30 < 115 < 35 Radish 07/28/22 < 34 < 31 < 61 < 34 < 57 < 23 < 42 < 43 < 26 < 30 < 115 < 35 Lettuce 07/28/22 < 30 < 31 < 52 < 33 < 60 < 32 < 51 < 46 < 32 < 30 < 142 < 46 Lettuce 08/11/22 < 41 < 38 < 70 < 42 < 80 < 33 < 76 < 56 < 39 < 36 < 176 < 44 Radish 08/11/22 < 19 < 22 < 46 < 23 < 47 < 23 < 41 < 36 < 19 < 22 < 98 < 20 Radish 08/11/22 < 19 < 22 < 46 < 23 < 47 < 23 < 41 < 36 < 19 < 22 < 98 < 20 Lettuce 08/11/22 < 41 < 38 < 70 < 42 < 80 < 33 < 76 < 56 < 39 < 36 < 176 < 44 Lettuce 08/31/22 < 36 < 32 < 67 < 39 < 72 < 36 < 59 < 59 < 34 < 32 < 173 < 48 Turnip 08/31/22 < 20 < 22 < 42 < 21 < 44 < 21 < 34 < 31 < 25 < 19 < 92 < 38 C')

I Turnip 08/31/22 < 20 < 22 < 42 < 21 < 44 < 21 < 34 < 31 < 25 < 19 < 92 < 38

..,I.

co Lettuce 08/31/22 < 36 < 32 < 67 < 39 < 72 < 36 < 59 < 59 < 34 < 33 < 173 < 48 Lettuce 09/08/22 < 25 < 25 < 57 < 28 < 57 < 27 < 44 < 43 < 28 < 27 < 125 < 41 Radish 09/08/22 < 30 < 32 < 57 < 26 < 66 < 21 < 44 < 40 < 27 < 26 < 113 < 27 Radish 09/08/22 < 30 < 32 < 57 < 26 < 66 < 21 < 44 < 40 < 27 < 26 < 113 < 27 Lettuce 09/08/22 < 25 < 25 < 57 < 28 < 57 < 27 < 44 < 43 < 28 < 27 < 125 < 41 Lettuce 09/22/22 < 34 < 33 < 68 < 32 < 63 < 37 < 56 < 53 < 34 < 34 < 158 < 42 Radish 09/22/22 < 22 < 19 < 40 < 20 < 50 < 19 < 27 < 28 < 24 < 20 < 80 < 24 Lettuce 10/06/22 < 42 < 44 < 80 < 44 < 72 < 45 < 62 < 58 < 50 < 47 < 189 < 51 Turnip 10/06/22 < 20 < 27 < 45 < 29 < 49 < 31 < 44 < 41 < 29 < 25 < 115 < 28 MEAN BO-QUAD 1 Collard Greens 07/14/22 < 30 < 32 < 74 < 33 < 75 < 30 < 65 < 58 < 44 < 35 < 176 < 47 Mustard Greens 07/14/22 < 33 < 33 < 84 < 37 < 76 < 35 < 71 < 47 < 46 < 35 < 151 < 43 Radish 07/14/22 < 29 < 32 < 74 < 35 < 66 < 33 < 61 < 51 < 38 < 38 < 145 < 52 Collard Greens 08/04/22 < 28 < 25 < 59 < 39 < 67 < 21 < 34 < 32 < 29 < 31 < 97 < 42 Turnip 08/04/22 < 37 < 34 < 92 < 46 < 80 < 33 < 59 < 50 < 41 < 41 < 137 < 49 Radish 08/04/22 < 31 < 50 < 72 < 40 < 79 < 30 < 58 < 47 < 43 < 31 < 169 < 56 Collard Greens 09/01/22 < 23 < 25 < 58 < 36 < 61 < 21 < 39 < 33 < 22 < 29 < 112 < 30 Turnip 09/01/22 < 20 < 18 < 50 < 14 < 43 < 23 < 40 < 34 < 22 < 23 < 92 < 26 Red Beets 09/01/22 < 31 < 29 < 68 < 36 < 67 < 34 < 49 < 44 < 30 < 28 < 134 < 22 Swiss Chard 10/13/22 < 31 < 30 < 63 < 38 < 85 < 39 < 65 < 51 < 34 < 38 < 142 < 40 Radish 10/13/22 < 40 < 43 < 101 < 36 < 92 < 42 < 76 < 53 < 42 < 41 < 194 < 54 Red Beets 10/13/22 < 39 < 33 < 70 < 45 < 91 < 45 < 47 < 53 < 39 < 39 < 173 < 47 MEAN

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BO-QUAD 2 Collard Greens 07/21/22 < 33 < 32 < 77 < 33 < 78 < 28 < 48 < 37 < 38 < 32 < 144 < 41 Kale 07/21/22 < 43 < 45 < 86 < 45 < 100 < 38 < 73 < 52 < 49 < 45 < 189 < 44 Red Beets 07/21/22 < 20 < 19 < 40 < 26 < 47 < 23 < 35 < 26 < 20 < 24 < 91 < 25 Collard Greens 08/04/22 < 30 < 33 < 70 < 21 < 64 < 24 < 44 < 45 < 36 < 24 < 146 < 49 Swiss Chard 08/04/22 < 40 < 36 < 84 < 37 < 63 < 26 < 64 < 53 < 42 < 41 < 144 < 66 Kale 08/04/22 < 31 < 35 < 77 < 49 < 79 < 34 < 57 < 51 < 39 < 37 < 138 < 40 Red Beets 08/18/22 < 37 < 39 < 96 < 54 < 82 < 37 < 71 < 49 < 40 < 37 < 128 < 30 Kale 09/01/22 < 31 < 26 < 59 < 26 < 78 < 31 < 45 < 42 < 33 < 29 < 128 < 39 Swiss Chard 09/01/22 < 21 < 23 < 45 < 25 < 44 < 22 < 36 < 38 < 24 < 24 < 89 < 21 Red Beets 09/01/22 < 15 < 15 < 31 < 16 < 31 < 15 < 23 < 19 < 16 < 15 < 50 < 13 Collard Greens 10/13/22 < 37 < 30 < 70 < 24 < 97 < 33 < 62 < 52 < 37 < 34 < 130 < 35 Swiss Chard 10/13/22 < 36 < 45 < 88 < 60 < 107 < 43 < 70 < 47 < 39 < 35 < 183 < 61 Red Beets 10/13/22 < 25 < 26 < 50 < 31 < 65 < 23 < 32 < 44 < 26 < 29 < 118 < 31 Sweet Potato 10/13/22 < 24 < 24 < 58 < 25 < 68 < 29 < 45 < 35 < 20 < 28 < 118 < 41 MEAN BO-QUAD 3

(")

I Mustard Greens 07/14/22 < 31 < 34 < 86 < 30 < 80 < 30 < 53 < 47 < 38 < 42 < 129 < 40 l'v 0 Cabbage 07/14/22 < 28 < 25 < 64 < 28 < 67 < 29 < 57 < 45 < 39 < 28 < 143 < 40 Radish 07/14/22 < 38 < 41 < 64 < 45 < 72 < 38 < 76 < 53 < 42 < 33 < 133 < 42 Mustard Greens 08/04/22 < 40 < 44 < 89 < 51 < 102 < 49 < 69 < 54 < 54 < 44 < 163 < 60 Cabbage 08/04/22 < 24 < 31 < 58 < 38 < 60 < 31 < 51 < 35 < 33 < 28 < 121 < 35 Turnip 08/04/22 < 22 < 22 < 50 < 23 < 50 < 19 < 41 < 34 < 32 < 29 < 116 < 28 Collard Greens 09/01/22 < 25 < 23 < 55 < 26 < 59 < 28 < 42 < 34 < 26 < 18 < 106 < 38 Cabbage 09/01/22 < 23 < 28 < 58 < 28 < 42 < 24 < 37 < 37 < 27 < 24 < 99 < 26 Turnip 09/01/22 < 14 < 15 < 33 < 17 < 28 < 14 < 18 < 20 < 18 < 14 < 62 < 20 Carrots 10/13/22 < 32 < 29 < 81 < 30 < 93 < 37 < 65 < 44 < 47 < 44 < 158 < 33 Turnip 10/13/22 < 28 < 26 < 66 < 20 < 66 < 22 < 52 < 33 < 30 < 27 < 113 < 29 MEAN BO-QUAD 4 Red Beets 07/14/22 < 18 < 18 < 36 < 19 < 39 < 18 < 36 < 31 < 21 < 18 < 92 < 21 Mustard Greens 07/14/22 < 20 < 23 < 43 < 21 < 45 < 22 < 38 < 37 < 23 < 21 < 101 < 36 Red Beets 08/04/22 < 40 < 38 < 92 < 36 < 81 < 39 < 63 < 52 < 45 < 42 < 185 < 42 Radish 08/04/22 < 44 < 44 < 82 < 46 < 89 < 48 < 74 < 69 < 48 < 47 < 203 < 57 Swiss Chard 08/04/22 < 35 < 29 < 59 < 40 < 76 < 34 < 63 < 51 < 34 < 35 < 137 < 30 Mustard Greens 08/04/22 < 25 < 23 < 53 < 24 < 48 < 24 < 42 < 34 < 25 < 24 < 108 < 33 Red Beets 09/01/22 < 27 < 28 < 58 < 25 < 60 < 25 < 48 < 32 < 37 < 27 < 119 < 29 Swiss Chard 09/01/22 < 45 < 38 < 73 < 31 < 78 < 39 < 65 < 56 < 45 < 47 < 185 < 65 Radish 09/01/22 < 30 < 30 < 47 < 32 < 59 < 31 < 44 < 43 < 31 < 27 < 124 < 35 Red Beets 10/13/22 < 35 < 36 < 87 < 25 < 66 < 35 < 55 < 50 < 30 < 43 < 146 < 37 Swiss Chard 10/13/22 < 34 < 34 < 70 < 37 < 76 < 41 < 70 < 52 < 43 < 40 < 168 < 43 Kohlrabi 10/13/22 < 31 < 30 < 46 < 38 < 85 < 36 < 54 < 53 < 31 < 36 < 147 < 40 MEAN BOLD = Detection Limt not met due to limited sample volume

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BWD-G1 Kale 06130122 < 29 < 30 < 64 < 31 < 73 < 30 < 56 < 55 < 34 < 34 < 140 < 49 Cabbage 06130122 < 40 < 40 < 62 < 41 < 69 < 30 < 47 < 49 < 45 < 37 < 137 < 42 Kohlrabi 06130122 < 28 < 27 < 73 < 24 < 43 < 28 < 37 < 33 < 30 < 35 < 140 < 32 Kale 07114122 < 36 < 31 < 76 < 38 < 87 < 33 < 78 < 45 < 43 < 35 < 134 < 44 Swiss Chard 07114/22 < 28 < 31 < 57 < 36 < 63 < 26 < 54 < 48 < 30 < 42 < 139 < 43 Kohlrabi 07/14122 < 18 < 22 < 49 < 19 < 49 < 20 < 42 < 37 < 24 < 25 < 99 < 24 Kale 07/28/22 < 39 < 31 < 56 < 39 < 83 < 40 < 54 < 49 < 41 < 37 < 163 < 40 Turnip 07/28/22 < 27 < 20 < 55 < 28 < 42 < 24 < 37 < 34 < 23 < 26 < 106 < 40 Kohlrabi 07/28/22 < 27 < 24 < 65 < 22 < 41 < 26 < 35 < 42 < 23 < 24 < 129 < 38 Turnip 08/11/22 < 29 < 31 < 67 < 40 < 64 < 30 < 55 < 46 < 30 < 41 < 125 < 44 Swiss Chard 08/11/22 < 28 < 20 < 51 < 31 < 51 < 28 < 44 < 41 < 25 < 29 < 111 < 40 Cabbage 08/11/22 < 22 < 25 < 46 < 21 < 48 < 26 < 41 < 38 < 26 < 25 < 95 < 32 Turnip 08/31/22 < 24 < 26 < 46 < 34 < 58 < 28 < 52 < 53 < 24 < 35 < 168 < 38 Swiss Chard 08/31/22 < 37 < 35 < 67 < 23 < 80 < 39 < 62 < 50 < 29 < 41 < 147 < 36 Kale 08/31/22 < 23 < 27 < 47 < 27 < 57 < 30 < 46 < 45 < 25 < 30 < 118 < 32 0I Turnip 09/08/22 < 27 < 32 < 50 < 24 < 51 < 31 < 53 < 41 < 28 < 20 < 138 < 36 I\:> Swiss Chard 09/08/22 < 38 < 30 < 77 < 42 < 77 < 32 < 62 < 57 < 38 < 37 < 148 < 45

..... Kale 09/08/22 < 30 < 34 < 68 < 38 < 59 < 30 < 66 < 54 < 20 < 43 < 122 < 37 Cabbage 09/22/22 < 24 < 27 < 50 < 26 < 61 < 26 < 44 < 39 < 20 < 27 < 142 < 36 Swiss Chard 09/22/22 < 28 < 37 < 73 < 34 < 59 < 33 < 52 < 49 < 32 < 36 < 140 < 38 Kale 09/22/22 < 22 < 22 < 51 < 28 < 44 < 26 < 35 < 38 < 27 < 24 < 111 < 39 Kohlrabi 10/06/22 < 31 < 33 < 60 < 37 < 66 < 31 < 54 < 38 < 38 < 39 < 116 < 41 Cabbage 10/06/22 < 23 < 23 < 52 < 24 < 58 < 24 < 36 < 34 < 31 < 33 < 113 < 32 Kale 10/06/22 < 21 < 23 < 57 < 25 < 54 < 25 < 39 < 29 < 26 < 30 < 104 < 22 Kohlrabi 10/20/22 < 26 < 31 < 65 < 29 < 60 < 36 < 46 < 49 < 34 < 35 < 124 < 40 Cabbage 10/20/22 < 22 < 26 < 43 < 25 < 53 < 26 < 41 < 31 < 25 < 23 < 90 < 13 Kale 10/20/22 < 29 < 31 < 50 < 28 < 51 < 30 < 42 < 36 < 28 < 30 < 122 < 45 MEAN

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BWD-G2 Cabbage 06/30/22 < 19 < 19 < 49 < 20 < 49 < 19 < 27 < 27 < 20 < 21 < 90 < 32 Kohlrabi 06130/22 < 27 < 23 < 62 < 22 < 71 < 27 < 52 < 51 < 24 < 28 < 108 < 39 Swiss Chard 06/30/22 < 33 < 36 < 66 < 36 < 70 < 33 < 57 < 59 < 36 < 37 < 157 < 51 Cabbage 07/14122 < 18 < 32 < 35 < 16 < 39 < 33 < 39 < 30 < 26 < 35 < 152 < 26 Kale 07/14/22 < 42 < 36 < 79 < 26 < 67 < 41 < 42 < 42 < 31 < 40 < 119 < 44 Turnip 07/14/22 < 27 < 27 < 69 < 32 < 70 < 30 < 60 < 44 < 34 < 41 < 133 < 45 Cabbage 07128/22 < 20 < 13 < 37 < 19 < 39 < 19 < 33 < 30 < 19 < 23 < 82 < 19 Kale 07/28122 < 26 < 24 < 62 < 30 < 87 < 25 < 49 < 51 < 31 < 33 < 105 < 45 Turnip 07/28122 < 22 < 23 < 46 < 24 < 51 < 27 < 41 < 40 < 26 < 30 < 100 < 36 Turnip 08/11/22 < 20 < 18 < 38 < 18 < 43 < 18 < 35 < 26 < 21 < 27 < 98 < 19 Kale 08/11/22 < 19 < 19 < 43 < 24 < 43 < 21 < 34 < 29 < 27 < 25 < 96 < 27 Kohlrabi 08/11/22 < 26 < 23 < 49 < 26 < 36 < 29 < 44 < 38 < 27 < 28 < 111 < 38 Turnip 08/31/22 < 23 < 22 < 61 < 29 < 57 < 32 < 46 < 54 < 30 < 27 < 142 < 44 Kale 08/31/22 < 29 < 25 < 62 < 32 < 48 < 32 < 64 < 36 < 31 < 37 < 144 < 37 Cabbage 08/31/22 < 19 < 25 < 42 < 23 < 40 < 24 < 41 < 36 < 22 < 29 < 104 < 34

(') Turnip 09/08/22 < 22 < 22 < 46 < 23 < 53 < 22 < 44 < 35 < 29 < 31 < 114 < 35 I

I\) Kale 09/08/22 < 26 < 24 < 49 < 36 < 59 < 27 < 47 < 42 < 29 < 32 < 127 < 45 I\)

Cabbage 09/08/22 < 33 < 38 < 66 < 37 < 78 < 33 < 57 < 50 < 35 < 31 < 165 < 36 Kohlrabi 09/08/22 < 19 < 16 < 51 < 29 < 43 < 17 < 30 < 29 < 26 < 21 < 85 < 28 Turnip 09/22/22 < 22 < 23 < 43 < 31 < 53 < 25 < 35 < 37 < 32 < 26 < 102 < 24 Kale 09/22/22 < 30 < 32 < 60 < 36 < 63 < 28 < 56 < 47 < 34 < 30 < 128 < 42 Kohlrabi 09/22/22 < 20 < 18 < 48 < 36 < 42 < 22 < 33 < 30 < 31 < 26 < 78 < 28 Turnip 10/06/22 < 22 < 23 < 48 < 27 < 44 < 27 < 37 < 33 < 28 < 27 < 109 < 29 Kale 10/06/22 < 29 < 25 < 54 < 24 < 67 < 34 < 44 < 39 < 34 < 29 < 112 < 39 Swiss Chard 10/06/22 < 29 < 25 < 55 < 26 < 55 < 29 < 41 < 39 < 29 < 24 < 113 < 33 Turnip 10/20/22 < 28 < 26 < 50 < 27 < 39 < 29 < 36 < 44 < 32 < 38 < 116 < 26 Kale 10/20/22 < 38 < 27 < 65 < 34 < 81 < 48 < 50 < 52 < 35 < 41 < 161 < 53 Cabbage 10/20/22 < 27 < 35 < 49 < 23 < 45 < 29 < 39 < 35 < 30 < 28 < 104 < 28 MEAN

Table C-X.1 QUARTERLY OSLO RESULTS FOR BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS Location Bo+ 2022 Normalized Net Dose, Quarterly Facility Dose, F 0 Annual BA+ Normalized Annual Monitoring 2022 Location Quarterly Baseline, BO MDD 0 (mrem)

MQx (mrem/std. Qtr.) (mrem) Baseline, BA (mrem)

MDDA (mrem)

Annual Dose, MA (mrem/yr)

Facility Dose, FA (mrem) 1 I 2 I 3 I 4 1 I 2 I 3 I 4 Control BD-03 15.50 25.34 14.0 15.1 16.3 17.8 ND ND ND ND 62.10 85.74 63.23 ND Ind - Far BD-02 15.00 24.84 12.5 16.4 16.5 18.2 ND ND ND ND 59.90 83.54 63.59 ND BD-04 14.10 23.94 12.2 13.7 16.1 16.3 ND ND ND ND 50.90 74.54 58.29 ND BD-05 15.60 25.44 13.0 16.3 16.1 15.2 ND ND ND ND 62.50 86.14 60.61 ND Ind - Inner BD-101 14.80 24.64 13.1 14.9 14.1 17.3 ND ND ND ND 59.10 82.74 59.41 ND BD-102 13.40 23.24 11.3 14.7 16.4 14.0 ND ND ND ND 53.70 77.34 56.37 ND BD-103 14.50 24.34 12.5 14.4 16.0 15.9 ND ND ND ND 57.90 81.54 58.79 ND BD-104 13.30 23.14 9.8 14.7 13.8 16.0 ND ND ND ND 50.60 74.24 54.34 ND BD-105 13.60 23.44 9.6 12.4 15.1 14.3 ND ND ND ND 54.40 78.04 51.43 ND BD-106 13.70 23.54 11.5 15.0 15.1 13.7 ND ND ND ND 54.70 78.34 55.27 ND BD-107 14.40 24.24 11.2 14.1 14.5 16.7 ND ND ND ND 57.50 81.14 56.47 ND BD-108 13.80 23.64 11.9 13.5 14.6 14.8 ND ND ND ND 55.00 78.64 54.78 ND BD-109 17.20 27.04 13.6 17.5 18.4 17.7 ND ND ND ND 68.90 92.54 67.22 ND BD-110 13.80 23.64 12.5 14.1 14.6 15.1 ND ND ND ND 55.20 78.84 56.29 ND BD-111a 13.50 23.34 11.5 12.3 15.1 15.3 ND ND ND ND 54.20 77.84 54.17 ND BD-112 13.70 23.54 12.2 13.9 15.2 15.8 ND ND ND ND 54.80 78.44 57.09 ND BD-113a 14.30 24.14 12.6 14.5 14.7 13.8 ND ND ND ND 57.00 80.64 55.60 ND BD-114 14.80 24.64 11.5 15.5 16.4 18.0 ND ND ND ND 59.20 82.84 61.37 ND C) BD-115 14.40 24.24 12.3 15.8 14.3 15.3 ND ND ND ND 57.60 81.24 57.69 ND I

I\J BD-116 15.40 25.24 14.3 16.1 15.9 18.0 ND ND ND ND 61.60 85.24 64.34 ND w Ind - Outer BD-201 18.70 28.54 16.7 18.5 20.1 22.8 ND ND ND ND 74.80 98.44 78.09 ND BD-202 14.40 24.24 12.4 14.5 15.4 16.8 ND ND ND ND 57.60 81.24 59.09 ND BD-203 14.80 24.64 11.9 15.0 14.9 15.8 ND ND ND ND 59.30 82.94 57.58 ND BD-204 13.40 23.24 11.4 13.2 13.6 16.6 ND ND ND ND 53.50 77.14 54.77 ND BD-205 13.70 23.54 11.7 13.3 12.8 16.4 ND ND ND ND 54.90 78.54 54.18 ND BD-206 14.50 24.34 14.5 14.2 15.6 15.2 ND ND ND ND 58.20 81.84 59.54 ND BD-207 13.40 23.24 11.6 14.1 15.5 13.9 ND ND ND ND 53.60 77.24 55.07 ND BD-208 14.20 24.04 12.0 14.7 15.5 14.5 ND ND ND ND 57.00 80.64 56.68 ND BD-209 17.50 27.34 14.9 16.4 18.2 17.9 ND ND ND ND 69.90 93.54 67.45 ND BD-210 16.90 26.74 14.7 17.2 18.9 17.7 ND ND ND ND 67.80 91.44 68.54 ND BD-211 18.70 28.54 15.9 20.9 19.5 18.7 ND ND ND ND 74.70 98.34 74.97 ND BD-212 14.50 24.34 11.8 14.5 17.3 17.1 ND ND ND ND 58.00 81.64 60.68 ND BD-213 13.70 23.54 12.3 13.2 15.9 16.2 ND ND ND ND 55.00 78.64 57.59 ND BD-214 16.90 26.74 16.4 17.4 20.0 17.6 ND ND ND ND 67.70 91.34 71.38 ND BD-215 14.30 24.14 12.4 13.5 15.4 15.9 ND ND ND ND 57.00 80.64 57.19 ND BD-216 16.10 25.94 13.0 17.2 17.7 19.4 ND ND ND ND 64.20 87.84 67.31 ND Ind- Near BD-06 14.20 24.04 13.1 14.6 15.0 15.5 ND ND ND ND 56.70 80.34 58.21 ND BD-19 16.00 25.84 12.5 15.3 17.5 20.9 ND ND ND ND 63.90 87.54 66.19 ND BD-20 15.00 24.84 13.1 15.9 16.0 17.8 ND ND ND ND 60.00 83.64 62.81 ND BD-21 14.70 24.54 11.3 13.8 14.6 18.6 ND ND ND ND 58.80 82.44 58.27 ND Other (ISFSI) BD-ISFSl-104-3 18.50 28.34 15.4 18.7 20.4 22.7 ND ND ND ND 74.10 97.74 77.16 ND BD-ISFSl-104-4 19.60 29.44 17.6 20.5 20.7 22.0 ND ND ND ND 78.4 102.0 80.8 ND BD-ISFSl-105-3 22.50 32.34 21.2 23.6 28.3 30.2 ND ND ND ND 90.1 113.7 103.3 ND BD-ISFSl-105-4 35.40 45.24 32.7 38.2 57.2 59.4 ND ND 21.8 24.0 141.5 165.1 187.5 46.04 BD-ISFSl-110-3 18.70 28.54 14.3 17.8 21.9 26.7 ND ND ND ND 74.8 98.4 80.7 ND BD-ISFSl-110-4 22.90 32.74 19.7 24.0 22.4 26.8 ND ND ND ND 91.6 115.2 92.9 ND ND= Non-Detect

TABLE C-X.2 MEAN QUARTLY OSLO RESULTS FOR THE INNER RING, OUTER RING, OTHER, CONTROL, AND INDEPENDENT SPENT FUEL STORAGE INSTALLATION (ISFSI) LOCATIONS FOR BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION OF THE STATION DATA COLLECTION SITE BOUNDARY INTERMEDIATE DIST OTHER CONTROL ISFSI PERIOD +/-2 S.D. +/-2 S.D. +/-2 S.D. +/-2 S.D. +/-2 S.D.

JAN-MAR 12.0 +/- 2.5 13.3 +/- 3.7 12.5 +/- 1.3 14.0 +/- 0.0 20.1 +/- 13.4 APR-JUN 14.6 +/- 2.6 15.5 +/- 4.5 15.1+/-2.3 15.1 +/- 0.0 23.8 +/- 15.0 JUL-SEP 15.3 +/- 2.3 16.6 +/- 4.5 16.0 +/- 1.9 16.3 +/- 0.0 28.5 +/- 28.7 OCT-DEC 15.7 +/- 2.9 17.0 +/- 4.2 17.5 +/- 4.0 17.8 +/- 0.0 31.3 +/- 28.2 TABLE C-X.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM +/-2 S.D.

SITE BOUNDARY 64 9.6 18.4 14.4 +/- 3.9

(') INTERMEDIATE DISTANCE 64 11.4 22.8 15.6 +/- 5.0 I

l'IJ OTHER 28 11.3 20.9 15.3 +/- 4.4

.i:,.

CONTROL 4 14.0 17.8 15.8 +/- 3.2 ISFSI 24 14.3 59.4 25.9 +/- 22.7 SITE BOUNDARY STATIONS- BD-101, BD-102, BD-103, BD-104, BD-105, BD-106, BD-107, BD-108, BD-109, BD-110, BD-111A, BD-112 BD-113A, BD-114, BD-115, BD-116 INTERMEDIATE DISTANCE STATIONS - BD-201, BD-202, BD-203, BD-204, BD-205, BD-206, BD-207, BD-208, BD-209, BD-210, BD-211, BD-212, BD-213, BD-214, BD-215, BD-216 OTHER STATIONS - BD-02, BD-04, BD-05, BD-06, BD-19, BD-20, BD-21 CONTROL STATION - BD-03 ISFSI STATIONS - BD-ISFSl-104-3, BD-ISFSl-104-4, BD-ISFSl-105-3, BD-ISFSl-105-4, BD-ISFSl-110-3, BS-ISFSl-110-4

FIGURE C-1 Surface Water - Gross Beta - Stations BD-10 and BD-25 (C)

Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-10 Kankaee River, Downstream 10.0 8.0 6.0

.J

~C.

4.0 2.0 0.0 - - - - - - + - - - - - - - - - - , f - - - - - - - - + - - - - - -

01-01-00 10-01-05 07-02-11 04-01-17 12-31-22 BD-25 (C) Kankakee River, Upstream 16.0 14.0 12.0 10.0 uC. 8.0 6.0 4.0 2.0 0.0 + - - - - - - + - - - - - - - + - - - - - - - + - - - - - - - !

01-01-00 10-01-05 07-02-11 04-01-17 12-31-22 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-25

FIGURE C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2022 BD-38 Main Drainage Ditch 14.0 12.0 10.0

! 8.0 ua.

6.0 4.0 2.0 0.0 01-25-07 01-18-11 01-11-15 01-04-19 12-28-22 BD-40 Braidwood Station Cooling Lake 16.0 14.0 12.0 10.0

! 8.0 ua.

6.0 4.0 2.0 0.0 - - - - - - - - - - - - + - - - - - - + - - - - - - - - !

10-05-06 10-26-10 11-16-14 12-07-18 12-28-22 C-26

FIGURE C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2022 BD-55 North Pond Fatlan Site 14.0 12.0 10.0

! 8.0 uCl.

6.0 4.0 2.0 0.0 01-25-07 01-18-11 01-11-15 01-04-19 12-28-22 BD-56 South Pond Fatlan Site 10.0 8.0 6.0 uCl.

4.0 2.0 0.0 01-25-07 01-18-11 01-11-15 01-04-19 12-28-22 GAPS IN DATA ARE DUE TO SAMPLING POINTS BEING FROZEN AT TIME OF COLLECTION C-27

FIGURE C-4 Surface Water - Tritium - Stations BD-10 and BD-25 (C)

Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-10 Kankakee River, Downstream 3000 2500 2000 1500 1000 500 0 +-.><....,;'-""""-Qlll~-+---------1,--------+--------l 03-25-00 12-03-05 08-13-11 04-22-17 12-31-22 BD-25 (C) Kankakee River, Upstream 400 300 uC. 200 100 0-+----------------------------1 03-25-00 12-03-05 08-13-11 04-22-17 12-31-22 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-28

FIGURE C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2022 BD-38 Main Drainage Ditch 600 500 400

~Cl. 300 200 100 0

03-09-06 05-22-10 08-04-14 10-17-18 12-30-22 BD-40 Braidwood Station Cooling Lake 400 300

~ 200 Cl.

100 0-i----------i---------------------1 07-20-06 08-30-10 10-10-14 11-20-18 12-31-22 C-29

FIGURE C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2022 BD-55 North Pond Fatlan Site 250 200 150 100 50 0+--------------------1--------1 03-29-07 03-07-11 02-13-15 01-22-19 12-31-22 BD-56 South Pond Fatlan Site 400 350 300 250 uC. 200 150 100 50 0

03-29-07 03-07-11 02-13-15 01-22-19 12-31-22 C-30

FIGURE C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-22 Wilmington 10.0 8.0 6.0 4.0 2.0 0.0 - - - - - - - - - - - - - - - - - - - - - - - 1 01-29-00 10-22-05 07-16-11 04-08-17 12-31-22 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-31

FIGURE C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-22 Wilmington 8000 7200 6400 5600 4800

~ 4000 c..

3200 2400 1600 800 0

01-29-00 10-22-05 07-16-11 04-08-17 12-31-22 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-32

FIGURE C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-13 Braidwood City Hall Well 500 400 300 200 100 0 -----=-+-----+--------;f-------+-------1 01-07-00 08-12-04 03-18-09 10-22-13 05-28-18 01-01-23 BD-34 Gibson Well 700 600 500 400 uC.

300 200 100 0

01-07-00 08-12-04 03-18-09 10-22-13 05-28-18 01-01-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 ANO MDC VALUES AFTER JULY.

C-33

FIGURE C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-35 Joly Well 500 400 300

~

uC.

200

\

100 0

01-07-00 08-12-04 03-18-09 10-22-13 05-28-18 01-01-23 BD-36 Hutton Well 1200 1000 800

....I

600

(.)

C.

400 200 0

01-07-00 08-12-04 03-18-09 10-22-13 05-28-18 01-01-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-34

FIGURE C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-37 Nurczyk Well 600 500 400 uc. 300 200 100 0 +-----"'-..:...0,.'----+-----+------+-----1-------1 01-07-00 08-12-04 03-18-09 10-22-13 05-28-18 01-01-23 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MOC VALUES AFTER JULY.

C-35

FIGURE C-12 Ground/Well Water - Tritium - Station BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2022 BD-50 Skole Well 1000 900 800 700

600 0C. 500 400 300 200 100 0

01-01-07 01-01-11 01-01-15 01-01-19 01-01-23 STATION 80-50 WAS /NIT/ALLY DISCONTINUED ON 10/18107 AND RESUMED ON 04/08/10 BD-51 Fatlan Well 600 500 400 0

C. 300 200 100 0

01-03-07 01-02-11 01-01-15 12-31-18 12-30-22 C-36

FIGURE C-13 Ground/Well Water - Tritium - Station BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2022 BD-54 Cash Well 600 500 400 uC. 300 200 100 0

01-03-07 01-02-11 01-01-15 12-31-18 12-30-22 C-37

FIGURE C-14 Air Particulate - Gross Beta- Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-03 (C) County Line Road 80.0 60.0 M

.§ uQ. 40.0 M

0 w

0 20.0 0.0 + - - - - - - - + - - - - - - - + - - - - - - - - - - - - - 1 01-07-00 10-05-05 07-04-11 04-01-17 12-29-22 BD-06 Godley 60.0 50.0 M 40.0

.§ uQ.

8 30.0 w

0 20.0 10.0 0.0 + - - - - - - - + - - - - - - - - - - - - - + - - - - - - - - - 1 01-07-00 10-05-05 07-04-11 04-01-17 12-29-22 C-38

FIGURE C-15 Air Particulate - Gross Beta- Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-19 Near Field, NW 60.0 50.0 M 40.0

.§ u C.

M 30.0 0

LU 0

20.0 10.0 0.0 + - - - - - - - - + - - - - - - + - - - - - - - - + - - - - - - - - !

01-07-00 10-05-05 07-04-11 04-01-17 12-29-22 BD-20 Near Field, N 70.0 60.0 50.0 M

.§ u C.

40.0 M

0 LU 30.0 0

20.0 10.0 0.0 + - - - - - - - - + - - - - - - + - - - - - - - - - - - - - - 1 01-07-00 10-05-05 07-04-11 04-01-17 12-29-22 C-39

FIGURE C-16 Air Particulate - Gross Beta- Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2022 BD-21 Near Field, NE 70.0 60.0 50.0 M

.§ uC.

40.0 M

0 UJ 30.0 0

20.0 10.0 0.0 + - - - - - - + - - - - - - + - - - - - - + - - - - - - - - - - - - - - <

01-07-00 10-05-05 07-04-11 04-01-17 12-29-22 C-40

FIGURE C-17 Air Particulate - Gross Beta- Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2022 BD-02 Near Field, NW 60.0 50.0

..., 40.0

.§ ua.

g 30.0 w

0 20.0 10.0 0.0 + - - - - - - - - + - - - - - - + - - - - - - - - + - - - - - - - - - - - !

07-07-05 11-19-09 04-03-14 08-16-18 12-29-22 BD-04 Near Field, N 60.0 50.0 40.0

('")

.§ ua. 30.0

('")

0 w

0

..... 20.0 10.0 0.0 07-07-05 11-19-09 04-03-14 08-16-18 12-29-22 C-41

FIGURE C-18 Air Particulate - Gross Beta- Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2022 BD-05 Near Field, NE 60.0 50.0 40.0 M

.§ ua. 30.0 M

0 IJJ 0

T"" 20.0 10.0 0.0 + - - - - - - t - - - - - - - - - - - - - - - - - - 1 07-07-05 11-19-09 04-03-14 08-16-18 12-29-22 C-42

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled~ne Brown Enaineerina Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Analytics Result Value March 2022 E13706 Milk Sr-89 pCi/L 80.3 96.8 0.83 A Sr-90 pCi/L 12.7 12.6 1.01 A E13707 Milk Ce-141 pCi/L 62.3 65 0.96 A Co-58 pCi/L 158 164 0.96 A Co-60 pCi/L 286 302 0.95 A Cr-51 pCi/L 314 339 0.93 A Cs-134 pCi/L 155 182 0.85 A Cs-137 pCi/L 210 223 0.94 A Fe-59 pCi/L 211 185 1.14 A 1-131 pCi/L 88.0 96.7 0.91 A Mn-54 pCi/L 169 164 1.03 A Zn-65 pCi/L 238 246 0.97 A E13708 Charcoal 1-131 pCi 79.9 87.1 0.92 A E13709 AP Ce-141 pCi 60.9 42.0 1.45 N(1l Co-58 pCi 118 107 1.11 A Co-60 pCi 218 196 1.11 A Cr-51 pCi 251 221 1.14 A Cs-134 pCi 129 118 1.09 A Cs-137 pCi 156 145.0 1.07 A Fe-59 pCi 124 120.0 1.03 A Mn-54 pCi 120 107 1.12 A Zn-65 pCi 162 160 1.01 A E13710 Soil Ce-141 pCi/g 0.123 0.103 1.19 A Co-58 pCi/g 0.254 0.263 0.97 A Co-60 pCi/g 0.493 0.483 1.02 A Cr-51 pCi/g 0.603 0.543 1.11 A Cs-134 pCi/g 0.268 0.292 0.92 A Cs-137 pCi/g 0.399 0.431 0.93 A Fe-59 pCi/g 0.320 0.296 1.08 A Mn-54 pCi/g 0.263 0.263 1.00 A Zn-65 pCi/g 0.407 0.395 1.03 A E13711 AP Sr-89 pCi 83.2 97.4 0.85 A Sr-90 pCi 12.7 12.7 1.00 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A =Acceptable - reported result falls within ratio limits of 0.80-1.20 W =Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) See NCR 22-04 (Page 1 of 2)

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teled;tne Brown En9ineerin9 Environmental Services TBE Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Analytics Result Value September 2022 E13712 Milk Sr-89 pCi/L 71.1 89.1 0.80 A Sr-90 pCi/L 12.0 13.6 0.88 A E13713 Milk Ce-141 pCi/L 148 161 0.92 A Co-58 pCi/L 178 189 0.94 A Co-60 pCi/L 229 260 0.88 A Cr-51 pCi/L 486 456 1.07 A Cs-134 pCi/L 220 252 0.87 A Cs-137 pCi/L 203 222 0.92 A Fe-59 pCi/L 174 173 1.01 A 1-131 pCi/L 75.9 94.2 0.81 A Mn-54 pCi/L 269 282 0.95 A Zn-65 pCi/L 364 373 0.97 A E13714 Charcoal 1-131 pCi 81.4 83.6 0.97 A E13715 AP Ce-141 pCi 102 91 1.12 A Co-58 pCi 118 107 1.11 A Co-60 pCi 207 147 1.41 N(2J Cr-51 pCi 310 257 1.21 w Cs-134 pCi 148 142 1.04 A Cs-137 pCi 137 125 1.10 A Fe-59 pCi 115 98 1.18 A Mn-54 pCi 168 159 1.05 A Zn-65 pCi 240 211 1.14 A E13716 Soil Ce-141 pCi/g 0.288 0.284 1.01 A Co-58 pCi/g 0.320 0.334 0.96 A Co-60 pCi/g 0.445 0.459 0.97 A Cr-51 pCi/g 0.883 0.805 1.10 A Cs-134 pCi/g 0.410 0.446 0.92 A Cs-137 pCi/g 0.447 0.465 0.96 A Fe-59 pCi/g 0.314 0.305 1.03 A Mn-54 pCi/g 0.489 0.499 0.98 A Zn-65 pCi/g 0.666 0.660 1.01 A E13717 AP Sr-89 pCi 87.5 98.3 0.89 A Sr-90 pCi 12.6 15.0 0.84 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning- reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (2) See NCR 22-21 (Page 2 of 2)

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance MonthNear Matrix Nuclide Units Reported Evaluation (bl Number Value (aJ Range Value February 2022 22-GrF46 AP Gross Alpha Bq/sample 0.402 1.20 0.36 - 2.04 A Gross Beta Bq/sample 0.669 0.68 0.341 -1.022 A 22-MaS46 Soil Ni-63 Bq/kg 645 780 546 - 1014 A Tc-99 Bq/kg 526 778 545-1011 N(3J 22-MaSU46 Urine Cs-134 Bq/L 1.67 1.77 1.24 - 2.30 A Cs-137 Bq/L 1.50 1.56 1.09 - 2.03 A Co-57 Bq/L 4.93 5.39 3.77 - 7.01 A Co-60 Bq/L 2.13 2.06 1.44 - 2.68 A Mn-54 Bq/L 4.83 5.08 3.56 - 6.60 A U-234 Bq/L 0.142 0.0074 0.0052 - 0.0096 N(4J U-238 Bq/L 0.0254 0.0103 0.0072 - 0.0134 N(4J Zn-65 Bq/L 4.71 4.48 3.14 - 5.82 A 22-MaW46 Water Ni-63 Bq/L 28.6 34.0 23.8 - 44.2 A Tc-99 Bq/L 8.59 7.90 5.5 - 10.3 A 22-RdV46 Vegetation Cs-134 Bq/sample 6.61 7.61 5.33 - 9.89 A Cs-137 Bq/sample 1.50 1.52 1.06-1.98 A Co-57 Bq/sample 5.11 5.09 3.56 - 6.62 A Co-60 Bq/sample 0.0162 (1) A Mn-54 Bq/sample 2.42 2.59 1.81 - 3.37 A Sr-90 Bq/sample 0.684 0.789 0.552 - 1.026 A Zn-65 Bq/sample 1.44 1.47 1.03 - 1.91 A August 2022 22-MaS47 Soil Ni-63 Bq/kg 14.6 (1) A Tc-99 Bq/kg 994 1000 700 - 1300 A 22-MaW47 Water Ni-63 Bq/L 24.4 32.9 23.0 - 42.8 A Tc-99 Bq/L 1.9 (1) N(5J 25-RdV47 Vegetation Cs-134 Bq/sample 0.032 (1) A Cs-137 Bq/sample 0.891 1.08 0. 758 - 1.408 A Co-57 Bq/sample 0.006 (1) A Co-60 Bq/sample 4.04 4.62 3.23 - 6.01 A Mn-54 Bq/sample 2.01 2.43 1.70 - 3.16 A Sr-90 Bq/sample 1.25 1.60 1.12-2.08 w Zn-65 Bq/sample 6.16 7.49 5.24 - 9.74 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W =Acceptable with warning- reported result falls within 0. 70-0.80 or 1.20-1.30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) False positive test (2) Sensitivity evaluation (3) Tc-99 soil cross-checks done for TBE information only- not required (4) See NCR 22-05 (5) See NCR 22-22 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification TBE Reported Known Acceptance Month/Year Matrix Nuclide Units Evaluation (bl Number Value Value (a) Limits March 2022 MRAD-36 Water Am-241 pCi/L 68.3 74.6 51.2 - 95.4 A Fe-55 pCi/L 797 1140 670 - 1660 A Pu-238 pCi/L 146 147 88.4 - 190 A Pu-239 pCi/L 69.9 71.9 44.5 - 88.6 A Soil Sr-90 pCi/kg 8050 6720 2090 - 10500 A AP Fe-55 pCi/filter 148 127 46.4 - 203 A Pu-238 pCi/filter 29.9 29.6 22.3 - 36.4 A Pu-239 pCi/filter 51.6 49.7 37.2 - 60.0 A U-234 pCi/filter 59.9 67.3 49.9 - 78.9 A U-238 pCi/filter 59.0 66.7 50.4 - 79.6 A GR-A pCi/filter 95.6 94.2 49.2 - 155 A GR-8 pCi/filter 71.2 66.8 40.5 - 101 A April 2022 RAD-129 Water Ba-133 pCi/L 61.7 62.9 52.3 - 69.2 A Cs-134 pCi/L 80.9 81.6 68.8 - 89.8 A Cs-137 pCi/L 37.4 36.6 32.1 - 43.3 A Co-60 pCi/L 103 97.4 87.7 - 109 A Zn-65 pCi/L 318 302 272 - 353 A GR-A pCi/L 26.9 20.8 10.4 - 28.3 A GR-8 pCi/L 49.7 51.0 34.7-58.1 A U-Nat pCi/L 56.3 68.9 56.3 - 75.8 A H-3 pCi/L 17,000 18,100 15,800 -19,000 A Sr-89 pCi/L 65.3 67.9 55.3 - 76.1 A Sr-90 pCi/L 42.1 42.7 31.5 - 49.0 A 1-131 pCi/L 25.7 26.2 21.8 - 30.9 A September 2022 MRAD-37 Water Am-241 pCi/L 111 96.2 66.0 - 123 A Fe-55 pCi/L 850 926 544 - 1350 A Pu-238 pCi/L 62.1 52.6 31.6 - 68.2 A Pu-239 pCi/L 139.5 117 72.5 - 144 A Soil Sr-90 pCi/kg 3350 6270 1950 - 9770 A U-234 pCi/kg 1684 3350 1570 - 4390 A U-238 pCi/kg 1658 3320 1820 - 4460 NlLJ AP Fe-55 pCi/filter 71.9 122 44.5 - 195 A Pu-238 pCi/filter 38.8 29.9 22.6 - 36.7 Nl'J Pu-239 pCi/filter 14.5 13.0 9.73-15.7 A U-234 pCi/filter 78.0 71.5 53.0 - 83.8 A U-238 pCi/filter 79.7 70.9 53.5 - 84.6 A GR-A pCi/filter 62.8 55.5 29.0 - 91.4 A GR-8 pCi/filter 70.9 64.8 39.3 - 97.9 A October 2022 RAD-131 Water Ba-133 pCi/L 76.2 79.4 66.6 - 87.3 A Cs-134 pCi/L 28.0 30.5 23.9 - 33.6 A Cs-137 pCi/L 202 212 191-235 A Co-60 pCi/L 52.4 51.4 46.3 - 59.1 A Zn-65 pCi/L 216 216 194 - 253 A GR-A pCi/L 19.7 16.9 8.28 - 23.7 A GR-B pCi/L 49.8 53.0 36.1 - 60.0 A U-Nat pCi/L 10.54 8.53 6.60 - 9.88 Nl.,J H-3 pCi/L 13,900 15,100 13,200 - 16,600 A Sr-89 pCi/L 59.7 64.5 52.3 - 72.5 A Sr-90 pCi/L 32.9 37.3 27.4 - 43.0 A 1-131 pCi/L 26.9 24.4 20.2 - 28.9 A (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 22-19 (2) U soil cross-checks done for TBE information only - not required (3) See NCR 22-20 (Page 1 of 1)

APPENDIX E ERRATA DATA

Intentionally left blank There was no errata data for 2022.

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

Intentionally left blank Docket No: 50-456 50-457 BRAIDWOOD STATION UNIT 1 and UNIT 2 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2022 C nst llation Braidwood Station Braceville, IL 60407 May 2023

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ...................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ........................................................................ 2 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium (H-3) ............................................................................ 3 Ill. Program Description ....................................................................................................... 4 A. Sample Analysis .................................................................................................. 4 B. Data Interpretation ............................................................................................... 4 C. Background Analysis ......................................................................................... 5 IV. Results and Discussion ................................................................................................. 7 A. Missed Samples .................................................................................................. 7 B. Groundwater Results ........................................................................................... 7 C. Surface Water Results ......................................................................................... 7 D. Summary of Results - Inter-laboratory Comparison Program ............................ 8 E. Leaks, Spills, and Releases ................................................................................. 8 F. Trends ................................................................................................................. 8 G. Investigations ...................................................................................................... 8 H. Actions Taken ...................................................................................................... 8

Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Braidwood Station, 2022 Figures Figure A-1 RGPP Groundwater Monitoring Well Sample Locations, Braidwood Station, 2022 Figure A-2 RGPP Surface Water Sample Locations Braidwood Station, 2022 Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium and Gross Alpha in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2022 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2022 Table B-1.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected as part of the Radiological Groundwater Protection Program in the Vicinity of Braidwood Station, 2022 Table B-I1.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 Table B-I1.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2022 ii

I. Summary and Conclusions In 2022, Exelon continued a comprehensive program that evaluates the impact of station operations on groundwater and surface water in the vicinity of Braidwood Station. This report reviews groundwater and surface water samples collected from the environment, both on and off station property, in 2022. During that time period, 199 analyses were performed on 125 samples from 32 locations.

In assessing all the data gathered for this report, it was concluded that the operation of Braidwood Station had no adverse radiological impact on the environment.

Gamma-emitting radionuclides associated with licensed plant operations were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater or surface water samples. In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection 10 times less than Braidwood's ODCM and 100 times less than federal regulation.

Strontium-89/90 (Sr-89/90) was not detected at a concentration greater than the LLD of 10.0 and 1.0 picocuries per liter (pCi/L) respectively in any of the groundwater samples tested.

No tritium (H-3) was detected in any sample at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Low levels of tritium were detected in groundwater at concentrations greater than the LLD of 200 pCi/L in 54 of 125 samples. The tritium concentrations ranged from 183 +/- 117 pCi/L to 1630 +/- 232 pCi/L. The tritium that was detected in the groundwater or surface water is believed to be the result of isolated historical releases and/or background from external sources greater than 200 pCi/L.

Gross Alpha analyses in the dissolved and suspended fractions were performed on one groundwater water sample in 2022. Neither Gross Alpha (dissolved) nor Gross Alpha (suspended) was detected.

Gross Alpha analyses in the dissolved and suspended fractions were not performed on surface water samples in 2022.

Hard-To-Detect analyses including americium-241 (Am-241), cerium-242 (Cm-242), cerium 243/244 (Cm-243/244), plutonium-238 (Pu-238), plutonium-239/240 (Pu-239/240), uranium-234 (U-234), uranium-235 (U-235) and uranium-238 (U-238) were performed on one sample in 2022. All HTD's were below required detection limits.

II. Introduction The Braidwood Station, consisting of two 3,645 MWt pressurized water reactors owned and operated by Exelon Corporation is located in Will County, Illinois. Unit No. 1 went critical on May 29, 1987. Unit No. 2 went critical on March 08, 1988.

The site is located in northeastern Illinois, 20 miles south-southwest of Joliet, Illinois, 60 miles southwest of Chicago and southwest of the Kankakee River.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Environmental Inc. Midwest Labs (EIML) on samples collected in 2022.

A. Objective of the Radiological Groundwater Protection Program (RGPP)

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

1. Identify suitable locations to monitor and evaluate potential impacts from station operations to preclude 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.

B. Implementation of the Objectives The objectives identified have been implemented at Braidwood Station as discussed below:

1. Exelon identified locations to monitor and evaluated potential impacts from station operations

2. The Braidwood Station reports describe the local hydrogeologic regime.

Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements

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

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

5. Braidwood Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends C. Program Description 1 . Sample Collection Sample locations can be found in Table A-1 and Figures A-1 through A-5, Appendix A.

2. Groundwater and Surface Water Samples of groundwater and surface water are collected, managed, transported and analyzed in accordance with EPA methods. Sample locations, sample collection frequencies and analytical frequencies are managed in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management and shipment of samples as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs as well as nuclear industry audits. Station personnel review and evaluate all analytical data as it is received. Additionally, analytical data results are reviewed by an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

D. Characteristics of Tritium (H-3)

Tritium is a radioactive isotope of hydrogen. Its chemical properties are the same as hydrogen. Tritiated water behaves the same as ordinary water in both the environment and the body. Tritiated water can be taken into the body by drinking water, breathing air, eating food or absorption through the skin. Once tritiated water enters the body, it disperses quickly and is uniformly distributed. Tritiated water is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. With such a short biological half-life, an acute ingestion would be cleared rapidly. Organically bound tritium (tritium that is incorporated into carbon containing compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays interact with air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors. 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 non-tritiated groundwater.

Ill. Program Description A. Sample Analysis This section describes the general analytical methodologies used by Teledyne Brown Engineering (TBE) and Environmental Incorporated Midwest Laboratory (EIML) to analyze the environmental samples for radioactivity for the Braidwood Station RGPP in 2022.

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

1. Concentrations of gamma emitters in groundwater and surface water

2. Concentrations of strontium in groundwater and surface water

3. Concentrations of tritium in groundwater and surface water

4. Concentrations of Gross Alpha (Dissolved and Suspended) in groundwater and surface water

5. Concentrations of Am-241 in groundwater

6. Concentrations of Cm-242 and Cm-243/244 in groundwater

7. Concentrations of Pu-238 and Pu-239/240 in groundwater

8. Concentrations of U-234, U-235 and U-238 in groundwater

9. Concentrations of Fe-55 in groundwater

10. Concentrations of Ni-63 in groundwater B. Data Interpretation The radiological data collected prior to Braidwood Station becoming operational was used as a baseline with which these operational data was compared. For the purpose of this report, Braidwood 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 specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.

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

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

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

For groundwater and surface water 14 nuclides, Be-7, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, 1-131, Cs-134, Cs-137, Ba-140 and La-140 were reported.

C. Background Analysis A pre-operational radiological environmental monitoring program (REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Braidwood Nuclear Power Station Commonwealth Edison Company, Annual Report 1986, May 1987.

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

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 USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected worldwide from 1960 to 2014. RadNet provides tritium precipitation concentration data for samples collected at stations throughout the U.S. from 1960 up to and including 2022. 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 in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c. Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River.

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

IV. Results and Discussion A. Missed Samples There were three missed samples during 2022.

1. MW-102R - a 1st Quarter sample could not be collected due to the annulus of the well being partially filled with sand.

2. MW a 3 rd Quarter sample could not be collected due to insufficient water in the well. According to station personnel, an excavation project was performed along the western side of the Turbine Building as part of the Underground Piping Project between April and mid-November. The excavation extended approximately 220 feet and was approximately 14 feet wide. The excavation project included dewatering activities that lowered the groundwater elevation in the area and resulted in insufficient groundwater for sampling in MW-6 during the 3Q22 sampling round.

3. PS10 - a 3 rd Quarter sample could not be collected due to insufficient water in the well.

B. Groundwater Results Samples were collected from on- and off-site wells throughout the year in accordance with the Station radiological groundwater protection program.

Analytical results and anomalies are discussed below:

Tritium Samples from all locations were analyzed for tritium activity. Tritium values ranged from the lower detection limit to 1630 pCi/L.

(Tables B-1.1, Appendix B)

Strontium Thirty-two samples for analyzed for Sr-89 and Sr-90. Sr-89 was less than the required detection limit of 10.0 pCi/liter. Sr-90 was less than the required detection limit of 1.0 pCi/liter. (Table B-1.1, Appendix B)

Gross Alpha (dissolved and suspended)

Gross Alpha analyses in the dissolved and suspended fractions were performed on one groundwater water sample in 2022. Neither Gross Alpha (dissolved) or Gross Alpha (suspended) was detected.

(Table B-1.1, Appendix B)

Hard-To-Detect Hard-To-Detect analyses including Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235 and U-238 were performed on one sample in 2022. All HTD's were less than required detection limits.

(Table B-1.3, Appendix B)

Gamma Emitters No samples were collected or analyzed for gamma-emitting nuclides in 2022. (Table B-1.2, Appendix B)

C. Surface Water Results No samples were collected from surface water locations in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below:

Tritium No samples were collected or analyzed for tritium activity.

(Table B-11.1, Appendix B)

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

E. Leaks, Spills, and Releases There were no leaks, spills or releases to groundwater in 2022.

F. Trends and Analyses Since June 2017, the CWBD House well tritium concentrations have been decreasing steadily. Monitoring of groundwater wells surrounding the plant indicate that tritium concentrations in affected areas near the Turbine Building have remained relatively unchanged since 2010.

G. Investigations There were no new investigations in 2022.

H. Actions Taken

1. Installation of Monitoring Wells Corrective actions taken in response to the CWBD House event included the placement of multiple monitoring wells at various depths in the vicinity of the CWBD house to determine soil contamination levels, as well as the establishment of soil remediation efforts to remove the tritium contamination from the area.

2. Compensatory Actions The discharges of the CWBD House remediation wells are treated as non-routine planned discharges. They are sampled regularly and permitted in the same manner as other ODCM pathways. The corresponding activity values are included as part of Table B-1.1 in this report.

3. Use of all remediation and support equipment from Exelon Braidwood Station property has stopped due to closure of the Braidwood Generating Station Consent Order No. 06 MR 248. Consent Order No.

06 MR 248 was terminated on May 14, 2020, by the Illinois Attorney General and Illinois Environmental Protection Agency.

Intentionally left blank APPENDIX A LOCATION DESIGNATION

Intentionally left blank TABLE A-1: Radiological Groundwater Protection Program Sampling Locations, Braidwood Station, 2022 Station Code Sam12le Descri12tion 0WM31P Drinking Water DITCH F (DS-2) Surface Water MW-2 Monitoring Well MW-4 Monitoring Well MW-5 Monitoring Well MW-6 Monitoring Well MW-7 Monitoring Well MW-9 Monitoring Well MW-11 Monitoring Well MW-102R Monitoring Well MW-1410 Monitoring Well MW-142D Monitoring Well MW-143D Monitoring Well MW-144D Monitoring Well MW-145D Monitoring Well MW-154 Background Well MW-155 Background Well MW-159D Monitoring Well MW-162D Monitoring Well MW-BW-201S Monitoring Well MW-BW-202S Monitoring Well MW-BW-203S Monitoring Well MW-BW-207I Monitoring Well PS-7 Monitoring Well PS-8 Monitoring Well PS-9 Monitoring Well PS-10 Monitoring Well PS-11 Monitoring Well PS-12 Monitoring Well PS-13 Monitoring Well PS-14 Monitoring Well PS-15 Monitoring Well RW-6 Recovery Well RW-11 Recovery Well RW-12 Recovery Well SG-BW-102 DITCH C Surface Water VB1-1 Monitoring Well VB2-5DR Monitoring Well VB3-2 Monitoring Well VB5-2 Monitoring Well VB6-1 Monitoring Well VB7-1 Monitoring Well VB6-1 Monitoring Well VB7-1 Monitoring Well VB8-2R Monitoring Well VB9-1 Monitoring Well VB10-1 R Monitoring Well VB11-1 Monitoring Well

0 1,000 CWBH Area M'f'1-145D VB6-1 vsi.2R VB10-1R ,

'-"~---=~"'i"""'-tjl,;,,~,,,,,* -----~--+-*'*-+":1"'"'*:---*--*-"'~~'

VBS:2' 'VB7-1 +*- ,--*vsg.1 1 VB11-1;:"t;;"

\\\.

0 4,000 8,000 0 50 100 \,,

Feet Feee.

Explanation:

Al Surface Water Location RGPP Sample Locations

Shallow Aquifer Monitoring Well Exelon Corporation Intermediate Aquifer Monitoring Well Braidwood Generating Station Figure A-1 RGPP Groundwater Monitoring Well Sample Locations Braidwood Station, 2022

L I

/ I I

r I

SURFACE WATER LOCATIONS TO BE SMIPLED AS PART OF TI-le RGPP 1eM1-81 ...... ,

Figure A-5 RGPP CWBD Monitoring Water Sample Locations Braidwood Station, 2022

Intentionally left blank APPENDIX B DATA TABLES

Intentionally left blank TABLE 8-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-2 03/17/22 412 +/- 132 MW-2 06/23/22 434 +/- 133 < 7.6 < 0.8 MW-2 09/20/22 432 +/- 137 MW-2 10/14/22 314 +/- 119 MW-4 03/15/22 614 +/- 147 MW-4 06/24/22 340 +/- 130 < 8.0 < 0.8 MW-4 09/22/22 393 +/- 127 MW-4 12/17/22 < 160 MW-5 03/16/22 183 +/- 117 MW-5 06/22/22 312 +/- 127 < 9.2 < 0.8 MW-5 08/24/22 467 +/- 132 MW-5 10/14/22 373 +/- 129 MW-6 03/17/22 607 +/- 139 MW-6 06/24/22 547 +/- 140 < 5.5 < 0.6 MW-6 12/16/22 1630 +/- 232 MW-7 03/15/22 390 +/- 133 MW-7 06/24/22 < 188 < 5.2 < 0.6 MW-7 09/22/22 238 +/- 120 MW-7 12/17/22 259 +/- 116 MW-11 03/16/22 194 +/- 117 MW-11 06/21/22 < 199 < 6.8 < 0.9 MW-11 08/24/22 < 194 MW-11 10/14/22 232 +/- 119 MW-102R 06/22/22 < 191 < 9.0 < 0.8 MW-102R 08/23/22 < 185 MW-102R 12/15/22 < 175 MW-1410 03/17/22 406 +/- 120 MW-1410 06/23/22 418 +/- 132 < 1.9 < 0.9 MW-1410 09/20/22 502 +/- 141 < 8.9 < 0.9 MW-1410 10/14/22 428 +/- 130 MW-142O 03/15/22 777 +/- 150 MW-142O 06/24/22 737 +/- 155 MW-142O 09/22/22 508 +/- 141 < 8.3 < 0.9 MW-142O 12/17/22 471 +/- 124 MW-143O 03/15/22 < 187 MW-143O 06/22/22 < 181 MW-143O 08/24/22 202 +/- 132 < 4.9 < 0.7 MW-143O 12/18/22 < 169 MW-144O 03/16/22 324 +/- 120 MW-144O 06/22/22 408 +/- 127 < 8.2 < 0.9 MW-144O 08/24/22 318 +/- 125 MW-144O 10/14/22 361 +/- 137 MW-145O 03/16/22 < 197 < 9.3 < 0.9 MW-145O 06/28/22 < 189 MW-145O 09/20/22 < 197 MW-145O 12/20/22 < 185 MW-154 03/16/22 < 179 MW-154 06/22/22 < 197 < 6.9 < 0.8 MW-154 08/23/22 < 189

TABLE 8-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-154 12/16/22 316 +/- 132 MW-155 03/16/22 < 185 MW-155 06/22/22 < 189 < 7.2 < 0.8 MW-155 08/23/22 < 197 MW-155 12/16/22 < 181 MW-159D 03/17/22 279 +/- 124 MW-159D 06/20/22 < 193 < 7.7 < 0.9 MW-159D 08/24/22 233 +/- 134 MW-159D 12/17/22 327 +/- 125 MW-162D 03/16/22 334 +/- 128 MW-162D 06/21/22 < 184 < 6.7 < 0.9 MW-162D 08/24/22 244 +/- 118 MW-162D 10/14/22 282 +/- 117 MW-BW-201S 03/16/22 352 +/- 132 MW-BW-201S 06/21/22 223 +/- 125 < 5.2 < 0.7 MW-BW-201S 08/24/22 320 +/- 126 MW-BW-201S 12/18/22 283 +/- 122 MW-BW-202S 03/16/22 191 +/- 117 MW-BW-202S 06/23/22 < 180 < 8.5 < 0.8 MW-BW-202S 08/24/22 < 191 MW-BW-202S 10/14/22 235 +/- 128 MW-BW-203S 03/15/22 < 184 MW-BW-203S 06/21/22 < 184 < 6.5 < 0.9 MW-BW-203S 08/24/22 < 186 MW-BW-203S 12/17/22 218 +/- 118 MW-BW-207I 03/17/22 714 +/- 149 MW-BW-207I 06/24/22 522 +/- 136 < 7.7 < 0.8 MW-BW-207I 09/22/22 542 +/- 146 MW-BW-207I 12/17/22 621 +/- 142 PS-10 02/15/22 < 192 PS-10 06/21/22 < 194 < 7.2 < 0.7 PS-10 12/14/22 < 167 PS-12 02/15/22 < 191 PS-12 06/21/22 < 187 < 7.6 < 0.9 PS-12 08/22/22 < 185 PS-12 12/14/22 < 170 RW-6 03/15/22 352 +/- 128 RW-6 06/22/22 < 181 < 8.3 < 0.9 RW-6 08/23/22 263 +/- 128 RW-6 12/15/22 208 +/- 120 VB1-1 03/16/22 < 182 VB1-1 06/22/22 < 172 < 4.7 < 1.0 VB1-1 08/23/22 < 194 VB1-1 12/16/22 238 +/- 123 VB3-2 03/15/22 < 197 VB3-2 06/22/22 < 199 < 8.0 < 0.9 VB3-2 08/23/22 < 176 VB3-2 12/14/22 < 189 VB5-2 03/16/22 < 193 < 6.7 < 0.8

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

VB5-2 06/28/22 < 192 VB5-2 09/20/22 < 191 VB5-2 12/20/22 < 188 VB6-1 03/16/22 < 198 < 9.3 < 0.9 VB6-1 06/28/22 < 188 VB6-1 09/20/22 < 187 VB6-1 12/20/22 < 175 VB7-1 03/16/22 < 199 < 8.2 < 0.9 VB7-1 06/28/22 < 183 VB7-1 09/20/22 < 191 VB7-1 12/20/22 < 180 VB8-2R 03/16/22 < 197 < 8.7 < 0.9 VB8-2R 06/28/22 < 178 VB8-2R 09/20/22 < 188 VB8-2R 12/20/22 < 164 VB9-1 03/16/22 < 194 < 9.0 < 0.9 VB9-1 06/28/22 < 177 VB9-1 09/20/22 < 186 VB9-1 12/20/22 < 173 VB10-1R 03/16/22 < 199 < 8.9 < 0.9 VB10-1R 06/28/22 < 191 VB10-1R 09/20/22 < 185 VB10-1R 12/20/22 < 173 VB11-1 03/16/22 < 197 < 9.1 < 0.9 VB11-1 06/28/22 < 190 VB11-1 09/20/22 < 193 VB11-1 12/21/22 < 165

TABLE 8-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No groundwater samples collected or analyzed for gamma emitters in 2022

TABLE 8-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 MW-2 09/05/21 < 0.07 < 0.07 < 0.04 < 0.07 < 0.04 < 0.13 < 0.10 < 0.08

TABLE B-I1.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RES ULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No surface water samples collected or analyzed for tritium in 2022 TABLE B-I1.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2022 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No surface water samples collected or analyzed for gamma emitters in 2022

BW230025, Annual Radiological Environmental Operating Report

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