BW210029, Annual Radiological Environmental Operating Report for 2020

Annual Radiological Environmental Operating Report for 2020

ML21132A024
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Site:	Braidwood
Issue date:	05/15/2021
From:	Teledyne Brown Engineering
To:	Exelon Generation Co, Office of Nuclear Reactor Regulation
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ML21132A022	List: BW210029, Annual Radiological Environmental Operating Report for 2020 ML21132A023
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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 2020 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Braidwood Station Braceville, IL 60407 May 2021

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 ...................................................................... 1O 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, 2020 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, 2020 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2020 Figures Figure B-1 Inner Ring and Other OSLO Locations of Braidwood Station, 2020 Figure B-2 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2020 Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2020 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, 2020 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-1.3 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-1.4 Concentrations of lron-55 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-1.5 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-I1.1 Concentrations of Gross Beta in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 ii

Table C-I1.2 Concentrations of Tritium in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-I1.3 Concentrations of 1-131 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-I1.4 Concentrations of Nickel-63 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-I1.5 Concentrations of lron-55 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-I1.6 Concentrations of Gamma Emitters in Public Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-II1.1 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-111.2 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-IV.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-V.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vl.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-Vlll.3 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Braidwood Station, 2020 Table C-X.1 Quarterly OSLO Results for Braidwood Station, 2020 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, 2020 iii

Table C-X.3 Summary of the Ambient Dosimetry Program for Braidwood Station, 2020 Figures Figure C-1 Surface Water - Gross Beta - Stations BD-10 and BD-25 (Control (C))

Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2007 - 2020 Figure C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2020 Figure C-4 Surface Water - Tritium - Stations BD-10 and BD-25 (C) Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2020 Figure C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2020 Figure C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-12 Ground/Well Water - Tritium - Stations BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2020 Figure C-13 Ground/Well Water - Tritium - Stations BD-53 and BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2020 Figure C-14 Air Particulate - Gross Beta - Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-15 Air Particulate - Gross Beta - Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-16 Air Particulate - Gross Beta - Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2020 Figure C-17 Air Particulate - Gross Beta - Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2020 iv

Figure C-18 Air Particulate - Gross Beta - Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2020 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2020 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2020 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2020 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR)

V

Intentionally left blank 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 ARE OR 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 af 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.

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 Hubblesite The Elactromagnetlc Spectrum Wavelength In meters C-1 About tM

• lz* ot 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 Electron 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.

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 600 Activity 400 200 0

1 half-hfe 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. 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:

Graphic 5. Sources of Radiation Exposure in the U.S., from NCRP Report No. 160 Sources of Radiation Exposure in the U.S.

Cosmic (Space) - 5%

Industrial and Terrestrial (Soil) - 3%

Occupational Internal- 5% <0.1%

D Natural Sources - 50%

~310 millirem (0.31 rem)

Manmade Sources - 50%

-310 millirem {0.31 rem)

Source: NCRP Report No.160(20091 Full report ls available on the NCRP website at www.NCRPonline.org The radiation from a nuclear power plant is included in the chart as part of the "Industrial and Occupational" fraction, <0.1 %. The largest natural source of radiation is from radon, because radon gas travels in the air we breathe. Perhaps you know someone who had a CT scan at a hospital to check his or her bones, brain, or heart.

CT scans are included in the chart as "Medical Procedures" which make up the next largest fraction. Graphic 6 on the following page shows some of the common doses humans receive from radiation every year.

Graphic 6 .Relative Doses from Radiation Sources, from EPA Radiation Doses and Sources RELATIVE DOSES FROM RADIATION SOURCES All dons fn:,m the Natlanal Council an Radiation Protection a Measurements, Report Na. 160 (unleu otherwise denoted)

Whale bacly CT l,000 mllllrem (single procedure)

Uppv &astra._..nal Jl-t'ay mm wltll ftuarascapy

&O0mllllrem (single procedure) llaclan In ...... U.S. ho-228 mllllrem (annual}

HudCT 200mlll1Nm (single praoedu,e}

CoMllc radiation llvtng 1ft 0 . -

(hlgh elavatlon) approximately 80 mllllrem (annual)

Mammogram 42mlll1Nm (singfe procedure) Cosmic ndlatlan living Ill -

Fram ICAP 2007 lnel (law elnatlan) eppnixlmately 30 mllllNm (annual)

-latlan In UM bacly 211 mllllrem (annuel)

T ~ I radioactivity 2l mllllNm (annual)

CIIMt X*ray l0mllllNm (single PfflffdUN)

Uvlng - *

• nudur pawm- station

< 1 mllllrem (annual) mrem 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 I bs overweight Stroke -

Motor Vehicle Accident -

Air Pollution

• Radon I Chemical Residue in foods I Orm*,1n1ng I Hunicanes and Tornadoes lightning Nuclear Power 0 500 1000 1S00 2000 2500 3000 Days of Lost Life Expectancy Hurricanes and Tornadoes lightning Nuclear Power I 0 02 0.4 0 .6 0.8 12 1.4 1.6 18 II. Summary and Conclusions This report on the Radiological Environmental Monitoring Program (REMP) conducted for Exelon's Braidwood Station covers the period January 1 , 2020 through December 31, 2020. During that time period 1,558 analyses were performed on 1,238 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. Nu elides 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, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated 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. OSLD 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 3.30E-01 mrem in 2020.

Ill. 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 Landauer Technologies on samples collected during the period January 1, 2020 through December 31, 2020.

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.

IV. Program Description A. Sample Collection Samples for the Braidwood Station REMP were collected for Exelon Nuclear 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 2020. 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, 80-25 (Control (C)), 80-38, 80-40, 80-55 and 80-56],

and one weekly composite sample of public drinking water at location (80-

22) and ground/well water samples collected quarterly from eight locations (80-13, 80-34, BD-35, 80-36, 80-37, 80-50, 80-51 and BD-54). All samples were collected in new plastic bottles, which were rinsed with source water prior to collection per procedure. Fish samples comprising the flesh of quillback, golden redhorse, flathead catfish, smallmouth bass, channel catfish, largemouth bass and common carp were collected semiannually at three locations, BD-25 (C), 80-28 and BD-41 . Sediment samples composed of recently deposited substrate were collected at three locations semiannually, 80-10, 80-25 (C), and BD-57.

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), 80-04, 80-05, 80-06, 80-19, 80-20 and 80-21]. 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 broad leaf vegetation were collected at six locations (BO-Control, BO-Quad 1, BO-Quad 2, BO-Quad 3, BO-Quad 4, BWO-G1 and BWO-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, Exelon changed the type of 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-115 and BD-116) at or near the site 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.

B. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Braidwood Station REMP in 2020. The analytical procedures used by the laboratories are listed in Table B-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.

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.

D. Program Exceptions For 2020, the Braidwood Station REMP had a sample recovery rate in excess of 99%. Sample anomalies and missed samples are listed in the tables below:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date B0-10, B0-25 M 2020 Sediments collected during the first week of June due to dangerously BS & B0-57 ay high water levels.

Lower reading of 146.8 hrs during 7-day period, possibly due to a APAI B0-02 05/28/20 power failure. NOTE: during the 06/04/20 collection, the timer indicated 161.4 hrs - normal time for the collection period.

Pump flow rate showed 54 cfh due to heavy residue of dust on the AP filter. Pump indicated normal cfh flow rate after a fresh filter installed.

AP/Al B0-04 07/30/20 NOTE: during the 08/06/20 collection, the flow meter indicated correct rate of 60 cfh .

Lower reading of 120.5 hrs due to power outages caused by winds &

APAI B0-02 08/13/20 severe thunderstorms in the area.

Lower reading of 134.4 hrs due to power outages caused by winds &

APAI 80-03 08/13/20 severe thunderstorms in the area.

Lower reading of 164.5 hrs due to power outages caused by winds &

APAI 80-04 08/13/20 severe thunderstorms in the area.

Lower reading of 154.8 hrs due to power outages caused by winds &

APAI B0-06 08/13/20 severe thunderstorms in the area.

Lower reading of 157.4 hrs due to a power outage. NOTE: during the AP/Al B0-02 10/29/20 collection on 11/05/20, the timer indicated 162.6 hrs - normal time for the collection period.

M 80-18 12/03/20 Milk not available; farmer stopped milking cows before calving .

Lower reading of 157.4 hrs due to a power outage. NOTE: during the AP/Al B0-02 12/17/20 collection on 12/23/20, the timer indicated 144.6 hrs - normal value for the 6-day collection period.

Both OSLO samples were mistakenly put together with the charcoal OSLO B0-305-2 12/31/20 samples and sent to the Teledyne Laboratory. OSLOs returned to EIML and delivered to the Braidwood management.

Table 0-2 LISTING OF MISSED SAMPLES Sample Location Code Collection Date Reason Type 01/16/20 01/23/20 Sample not collected due to snow accumulation and SW BD-25 02/06/20 road closure 02/13/20 01/23/20 SW BD-55

-02/20/20 No sample; lake frozen 01/23/20 01/30/20 SW BD-56 02/13/20 No sample; lake frozen 02/20/20 03/19/20 No sample collected due to location being closed SW BD-25

- 04/30/20 (state of health emergency)

Quad 1, Quad 2, VE Quad 3,Quad 4 June 2020 No vegetables available- too early in the season

& Control, 06/18/20 VE(M) BWD-G1, BWD-G2 Vegetation samples too small to collect 07/02/18 07/16/20 VE (M) BWD-G2 Vegetation samples too small to collect 07/30/20 July -

VE Control No root vegetables available September 2020 August- Unable to collect samples - no suitable vegetables VE Quad 2, Quad 3 September 2020 found; farmers not open due to health emergency Milk not available; farmer stopped milking cows M BD-18 12/03/20 before calving season OLD found missing during exchange, possibly OSLO BD-04 12/31/20 dislodged by snowplowing activity; premises searched unsuccessfully SW BD-10, BD-56 12/31/20 No sample; water frozen No sample; access road closed due to snow and ice SW BD-25 12/31/20 accumulation 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 2020.

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 56 of 71 samples. The values ranged from 2.7 to 13.3 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 1 of 24 samples at a concentration of 448 +/- 129 pCi/L. Concentrations detected 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 Ni-63 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-1.4, 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 11 of 12 samples. The values ranged from 2.1 to 8.4 pCi/L. Concentrations 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-I1.2, Appendix C). Tritium was detected in 9 of 12 samples. Concentrations ranged from 203 to 1,500 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-I1.3, 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-II.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-I1.5, 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, 80-34, 80-35, 80-36, 80-37, 80-50, 80-51 and BD-54). The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-111.1, Appendix C). Tritium was not detected in any sample and the required LLD was met. 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-I1.3, Appendix C)

4. Fish Fish samples comprising the flesh of quillback, golden redhorse, flathead catfish, smallmouth bass, channel catfish, largemouth bass and common carp 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. 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. No fission or activation products were found and all required LLDs were met. (Table C-V.1, Appendix C)

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 6E-03 to 32E-03 pCi/m 3 with a mean of 16E-03 pCi/m 3

• The results from the far field (Group II) ranged from 6E-03 to 34E-03 pCi/m 3 with a mean of 16E-03 pCi/m 3 . The results from the Control location (Group Ill) ranged from BE-03 to 31 E-03 pCi/m 3 with a mean of 17E-03 pCi/m 3 . Comparison of the 2020 air particulate data with previous years' data indicate no effects from the operation of Braidwood Station. Additionally, a comparison of the weekly values for 2020 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)

C. Terrestrial Environment

1. Milk (Ml)

Samples were collected from one location (control location BD-18).

Sampling frequencies were increased to biweekly in May and continued through October and monthly sampling was performed November through April. The following analyses were performed :

lodine-131 Milk samples were 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 Each 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-N1 and BWD-N2 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 4.8 to 38.2 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 0.33 mrem for the year.

E. Land Use Survey A Land Use Survey conducted during August 29, 2020, around the Braidwood Station was performed by EIML for Exelon Nuclear 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 ft 2 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 2020 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 2020 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:

1. Analytics Evaluation Criteria Analytics' evaluation report provides a ratio of TS E's result and Analytics' known value. Since flag values are not assigned by Analytics, TSE 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 TSE laboratory, 126 out of 133 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TSE Corrective Action Program. A summary is found below:

1. The MAPEP February 2020 AP U-233/234 and U-238 results were evaluated as Not Acceptable. The reported value for U-233/234 was 0.0416 +/- 0.0102 Sq/sample and the known result was 0.075 Sq/sample (acceptance range 0.053 - 0.098). The reported value for U-238 was 0.0388 +/- 0.00991 Sq/sample and the known result was 0.078 Sq/sample (acceptance range 0.055 - 0.101 ). This sample was run as the workgroup duplicate and had RPD's of 10.4% (U-234) and 11.7% (U-238). After the known results were obtained, the sample was relogged.

The filter was completely digested with tracer added originally; the R1 results were almost identical. It was concluded that the recorded tracer amount was actually double, causing the results to be skewed. Lab worksheets have been modified to verify actual tracer amount vs. LIMS data. TBE changed vendors for this cross-check to ERA MRAD during the 2nd half of 2020. Results were acceptable at 97.8% for U-234 and 106% for U-238. (NCR 20-13)

2. The Analytics September 2020 milk Sr-89 result was evaluated as Not Acceptable. The reported value was 62.8 pCi/L and the known result was 95.4 (66%). All QC data was reviewed and there were no anomalies. This was the first failure for milk Sr-89 since 2013 and there have only been 3 upper/lower boundary warnings since that time. It is believed that there may have been some Sr-89 loss during sample prep.

The December 2020 result was at 92% of the known. (NCR 20-19)

3. The ERA October 2020 water 1-131 result was evaluated as Not Acceptable. The reported value was 22.9 pCi/L and the known result was 28.2 (acceptance range 23.5 - 33.1 ). The reported result was 81 %

of the known, which passes TBE QC criteria. This was the first failure for water 1-131. (NCR 20-17)

4. The ERA October 2020 water Gross Alpha and Gross Beta results were evaluated as Not Acceptable. The reported/acceptable values and ranges are as follows:

Reported Known Range Gross Alpha 40.0 26.2 13.3 - 34.7 Gross Beta 47.5 69.1 48.0 - 76.0 All QC data was reviewed with no anomalies and a cause for failure could not be determined. This was the first failure for water Gross Beta.

A Quick Response follow-up cross-check was analyzed as soon as possible with acceptable results at 96.8% for Gross Alpha and 102% for Gross Beta. (NCR 20-18)

5. The MAPEP August 2020 soil Ni-63 result was evaluated as Not Acceptable. The reported value was 438 +/- 21.1 Bq/kg and the known result was 980 Bq/kg (acceptance range 686 - 1274). It is believed that some Ni-63 loss occurred during the sample prep step. (NCR 20-20)

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

Intentionally left blank APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT ANNUAL

SUMMARY

Intentionally left blank TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2020 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50.457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN(M) STATION# NONROUTINE (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 71 4 6.4 5 8.7 BD-40 INDICATOR 0 (PCVLITER) (47/60) (9/11) (12/12) BRAIDWOOD STATION COOLING LAKE 2.7-13.3 4.3-6.0 5.3- 12.4 ONSITE H-3 24 200 448 <LLD 448 BD-10 INDICATOR 0 (1/20) (1/4) KANKAKEE RIVER DOWNSTREAM 5.4 MILES NE OF SITE Nl-63 23 30 <LLD <LLD 0 FE-55 23 200 <LLD <LLD 0 GAMMA 71

)>

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 4.2 NA 4.2 BD-22 INDICATOR 0 (PCVLITER) (11/12) (11/12) WILMINGTON 2.1-8.4 2.1-8.4 6.0 MILES NE OF SITE H-3 12 200 584 NA 584 BD-22 INDICATOR 0 (9/12) (9/12) WILMINGTON 203-1500 203- 1500 6.0 MILES NE OF SITE 1-131 12 <LLD NA 0 Nl-63 12 30 <LLD <LLD 0 FE-55 12 200 <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2020 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS PUBLIC WATER GAMMA 12 (PCVLITER) MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 C0-60 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 CS-137 18 <LLD NA 0

)> BA-140 60 <LLD NA 0 I

I\) LA-140 15 <LLD NA 0 GROUND WATER H-3 32 200 <LLD NA 0 (PCVLITER)

GAMMA 32 MN-54 15 <LLD NA 0 CO-58 15 <LLD NA 0 FE-59 30 <LLD NA 0 C0-60 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 (PCVKG WET)

Nl-63 12 260 <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fradion of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2020 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50.457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN(M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH GAMMA 12 (PCVKG WET) 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 1-131 NA <LLD <LLD 0 CS-134 130 <LLD <LLD 0

)> 0 I CS-137 150 <LLD <LLD (A)

BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 SEDIMENT FE-55 6 2000 <LLD <LLD 0 (PCVKGDRY)

Nl-63 6 260 <LLD <LLD 0 GAMMA 6 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 <LLD <LLD 0 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 delectable measurement are indicated in parentheses.

TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2020 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN (M) MEAN (M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GR-B 424 10 16 17 17 BD-03 CONTROL 0

{E-3 PCVCU.METER) (370/371) (53/53) (53/53) COUNTY LINE ROAD 6-34 8-31 8-31 6.2 MILES ESE OF SITE GAMMA 32 MN-54 NA <LLD <LLD 0 CO-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 NA <LLD <LLD 0 ZN-65 NA <LLD <LLD 0 NB-95 NA <LLD <LLD 0 l>

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 424 (E-3 PCVCU.METER) /-131 70 <LLD <LLD 0 MILK 1-131 19 <LLD <LLD 0 (PCIIUTER)

GAMMA 19 MN-54 NA <LLD <LLD 0 C0-58 NA <LLD <LLD 0 FE-59 NA <LLD <LLD 0 C0-60 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, 2020 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2020 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN(M) MEAN(M) MEAN (M) STATION# NONROUTINE (UNITOF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS GRASS GAMMA 0 (PCVKG WET) MN-54 NA 0 CO-58 NA 0 FE-59 NA 0 C0-60 NA 0 ZN-65 NA 0 NB-95 NA 0 ZR-95 NA 0 CS-134 60 0 CS-137 60 0 l>

I BA-140 80 0 en LA-140 NA 0 NA 0 VEGETATION GAMMA 55 (PCVKG 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 1-131 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 183 NA 14 14 32.7 BD-ISFSl-105-4 INDICATOR 0

{MILLIREMIQTR.) (1791179) (414) (4/4) 4.8 - 38.2 8.7

• 22.3 29.4

• 38.2 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, 2020 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 H. Food Products BWD-G1 Nearsite NE 0.54 miles NE BWD-G2 Nearsite W 0.21 milesW Quadrant 1 Clark Farm 3.8 miles ENE Quadrant2 W.F. Soltwisch 4.5 miles SSE Quadrant 3 Terri Schultz 4.8 miles SSW Quadrant4 Bruce Sinkular 1.9 miles NNW Control Gorman Farm 9.0 miles NE B-1

TABLE 8-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2020 Distance & Direction Location Location Description From Site I. Environmental Dosimetry - OSLD 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 0.3miles 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 4.5miles 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) 0.5miles WSW BD-19 Nearsite NW (indicator) 0.3miles 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 0.13milesE 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, 2020 Distance in Miles from the Braidwood Station ISFSI Pad, 2020 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, 2020 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 8-3

TABLE 8-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2020 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 samoles 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 Al2O3:C Landauer Incorporated Landauer Incorporated Dosimetrv elements.

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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, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/03/20 - 01/16/20 4.8 +/- 1.8 4 .8 +/- 1.9 7.1 +/- 2.4 9.1 +/- 2.4 4.0 +/- 1.6 4.5 +/- 1.8 02/06/20 - 02/27120 3.5 +/- 1.8 4 .5 +/- 1.9 13.3 +/- 2.7 9.0 +/- 2.4 4.8 +/- 1.8 < 2.6 03/05/20 - 03/26/20 < 3.2 4.6 +/- 2.3 5.0 +/- 2.7 9.8 +/- 3.2 3.7 +/- 2.0 < 3.4 04/02/20 - 04/30/20 6.3 +/- 2.0 (1) 7.1 +/- 2.4 7.8 +/- 2.5 5.4 +/- 1.7 4.8 +/- 2.0 05/07/20 - 05/28/20 < 3.6 < 3.6 3.4 +/- 1.4 5.7 +/- 1.6 < 3.3 < 4.0 06/04/20 - 06/25/20 < 3.1 < 3.0 4.7 +/- 2.4 6.8 +/- 2.5 < 2.6 < 2.9 07/02/20 - 07/30/20 3.8 +/- 2.0 5.6 +/- 2.1 4.1 +/- 2.5 5.3 +/- 2.1 < 2.3 < 2.7 08/06/20 - 08/27 /20 5.5 +/- 1.9 6.0 +/- 2.0 7.0 +/- 2.5 9.2 +/- 2.5 3.8 +/- 1.5 3.3 +/- 1.7 09/03120 - 09/24/20 4.8 +/- 2.0 5.4 +/- 2.1 8.8 +/- 2.8 8.4 +/- 2.7 < 2.2 4.2 +/- 2.2 10/01/20 - 10/29120 4.1 +/- 2.0 5.3 +/- 2.3 7.3 +/- 2.8 12.4 +/- 3.2 2.7 +/- 1.7 < 3.0 11 /05/20 - 11 /25/20 4.9 +/- 2.0 4.3 +/- 1.9 12.4 +/- 2.9 8.8 +/- 2.5 3.7 +/- 1.6 4.8 +/- 2.0 12/03/20 - 12/23/20 7.4 +/- 2.4 4.9 +/- 2.2 11 .8 +/- 3.0 12.4 +/- 3.1 3.7 +/- 1.8 4.3 +/- 2.2 MEAN +/- 2 STD DEV 5.0 +/- 2.5 5.0 +/- 1.1 7.6 +/- 6.6 8.7 +/- 4.4 4.0 +/- 1.6 4.3 +/- 1.1 Table C-I.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01103/20 - 03/26/20 < 198 < 195 < 194 < 193 < 193 < 190 04/02/20 - 06/25/20 < 180 < 181 < 180 < 178 < 181 < 180 07/02/20 - 09/24/20 < 184 < 189 < 187 < 187 < 187 < 186 10/01/20 - 12/23/20 448 +/- 129 < 181 < 191 < 189 < 183 < 182 MEAN+/- 2 STD DEV 448 +/- 0 THE MEAN AND 7WO 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, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 80-10 80-25 01/03/20 - 01/30/20 < 20 < 21 02/20/20 - 02/27/20 < 23 < 23 03/05/20 - 03/12/20 < 20 < 20 04/02/20 - 04/30/20 < 19 (1) 05/07/20 - 05/28/20 < 22 < 20 06/04/20 - 06/25/20 < 24 < 21 07/02/20 - 07/30/20 < 21 < 19 08/06/20 - 08/27/20 < 23 < 23 09/03/20 - 09/24/20 < 15 < 22 10/01 /20 - 10/29/20 < 23 < 25 11/05/20 - 11 /25/20 < 21 < 25 12/03/20 - 12/23/20 < 20 < 19 MEAN Table C-1.4 CONCENTRATIONS OF IRON-55 IN SURFACE WATER SAMPLES COLLECTED IN THE VACINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD 80-10 80-25 01/03/20 - 01/30/20 < 153 < 102 02/20/20 - 02/27/20 < 59 < 65 03/05/20 - 03/12/20 < 67 < 83 04/02/20 - 04/30/20 < 136 (1) 05/07/20 - 05/28/20 < 90 < 64 06/04/20 - 06/25/20 < 64 < 94 07/02/20 - 07/30/20 < 69 < 80 08/06/20 - 08/27/20 < 104 < 121 09/03/20 - 09/24/20 < 159 < 53 10/01 /20 - 10/29/20 < 92 < 107 11 /05/20 - 11 /25/20 < 80 < 71 12/03/20 - 12/23/20 < 59 < 112 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, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-10 01/03/20 - 01/30/20 < 6 < 7 < 11 < 8 < 14 <6 < 8 < 10 <6 < 8 < 26 < 8 02/06/20 - 02/27/20 < 6 < 5 < 12 < 5 < 11 <6 < 10 < 10 <6 <6 < 26 < 13 03/05/20 - 03/26/20 <5 < 8 < 13 < 8 < 15 < 8 < 11 < 12 < 8 <7 < 34 < 13 04/02/20 - 04/30/20 <6 <5 < 10 <8 < 9 <7 < 11 < 8 <9 < 6 < 25 < 7 05/07/20 - 05/28/20 < 5 <6 < 10 <5 < 9 < 5 < 8 < 14 <6 < 5 < 33 < 11 06/04/20 - 06/25/20 <4 <4 < 10 < 4 < 9 <6 < 8 < 11 <4 < 4 < 27 < 11 07/02/20 - 07/30/20 < 6 < 5 < 11 <4 < 11 < 5 < 10 < 10 <6 <7 < 28 < 8 08/06/20 - 08/27/20 < 5 <4 < 9 <4 < 8 < 5 < 7 < 12 <4 <4 < 25 < 11 09/03/20 - 09/24/20 < 7 < 6 < 10 < 6 < 13 <7 < 7 < 9 <7 <8 < 26 < 10 10/01/20 - 10/29/20 < 6 < 6 < 12 < 6 < 15 <7 < 12 < 11 < 6 <7 < 33 < 8 11/05/20 - 11/25/20 <4 <5 < 12 <5 < 8 <5 < 8 < 14 <5 <5 < 32 < 10 12/03/20 - 12/23/20 <4 <4 <7 <4 < 7 <5 < 7 < 12 <4 <3 < 32 < 9 MEAN BD-25 01/03/20 - 01/30/20 < 3 < 3 <7 <4 < 8 <4 <6 < 6 <4 <3 < 16 < 6 02/20/20 - 02/27/20 < 5 <4 < 11 <8 < 11 < 5 < 10 < 9 < 6 <5 < 17 <5 03/05/20 - 03/12/20 <2 <2 <6 <2 <4 <2 <4 < 12 < 2 < 2 < 22 <7 0I 04/02/20 - 04/30/20 (1)

CA) 05/07/20 - 05/28/20 <4 < 5 < 11 < 4 < 10 < 5 < 7 < 14 <4 <4 < 29 < 8 06/04/20 - 06/25/20 <4 < 5 < 9 <4 < 8 < 5 < 8 < 11 < 5 < 4 < 28 < 9 07/02/20 - 07/30/20 < 5 <5 < 12 <4 < 11 <5 < 8 < 9 < 5 <5 < 28 < 9 08/06/20 - 08/27/20 <4 <3 < 10 <4 < 8 <5 < 8 < 14 < 5 <4 < 27 < 13 09/03/20 - 09/24/20 <7 <8 < 10 <8 < 14 <8 < 11 < 10 <8 <8 < 22 < 11 10/01/20 - 10/29/20 <7 < 7 < 14 <6 < 15 <7 < 12 < 12 <7 <7 < 32 < 7 11/05/20 - 11/25/20 <5 < 5 < 11 < 5 < 10 <6 < 7 < 15 <5 <5 < 29 < 10 12/03/20 - 12/23/20 <4 <4 < 9 < 4 < 9 < 5 < 9 < 14 <6 <5 < 37 < 14 MEAN BD-38 01/03/20 - 01/30/20 <8 <6 < 15 <7 < 16 <9 < 12 < 12 < 8 < 7 < 31 < 12 02/06/20 - 02/27/20 <7 <6 < 14 <7 < 14 <7 < 11 < 13 < 7 < 7 < 37 < 8 03/05/20 - 03/26/20 < 6 < 8 < 14 <6 < 12 <7 < 13 < 11 < 7 < 6 < 29 < 10 04/02/20 - 04/30/20 <7 < 6 < 15 <7 < 14 <7 < 12 < 10 < 6 < 6 < 31 < 8 05/07/20 - 05/28/20 < 3 <3 < 8 <3 < 7 <3 <6 < 9 < 3 < 3 < 21 < 6 06/04/20 - 06/25/20 < 5 <6 < 11 <6 < 15 <5 < 8 < 14 < 7 < 6 < 44 < 12 07/02/20 - 07/30/20 <4 <4 < 10 < 5 < 6 <5 < 9 < 8 < 5 < 5 < 23 < 8 08/06/20 - 08/27/20 <4 < 4 < 10 <4 < 8 <4 <8 < 14 < 5 < 4 < 29 < 9 09/03/20 - 09/24/20 <6 <7 < 14 <7 < 12 < 6 < 11 < 10 < 8 < 8 < 25 < 8 10/01 /20 - 10/29/20 < 5 <5 < 11 <7 < 10 < 5 < 11 < 8 < 7 < 5 < 32 < 8 11/05/20 - 11/25/20 < 5 <5 < 10 <7 < 12 < 6 <9 < 14 < 5 < 6 < 35 < 10 12/03/20 - 12/31/20 <7 <6 < 14 < 8 < 14 < 8 < 8 < 10 < 6 < 7 < 25 < 11 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANA T/ON

Table C-1.5 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-40 01/03/20 - 01/30/20 <7 <5 < 18 < 7 < 18 < 10 < 12 < 12 < 8 <8 < 37 < 13 02/06/20 - 02/27/20 < 6 <7 < 14 < 6 < 13 < 6 < 13 < 10 <5 <7 < 34 < 11 03/05/20 - 03/26/20 < 8 < 5 < 17 < 9 < 11 <8 < 14 < 12 <8 <6 < 29 < 12 04/02/20 - 04/30/20 <7 < 8 < 17 < 9 < 11 < 8 < 11 < 10 <7 < 8 < 33 < 12 05/07/20 - 05/28/20 <5 < 5 < 12 < 5 < 9 < 5 < 8 < 15 <5 <5 < 27 < 12 06/04/20 - 06/25/20 <4 <4 < 8 < 3 < 7 <4 < 7 < 11 <4 <4 < 23 < 8 07/02/20 - 07/30/20 <7 <7 < 12 < 8 < 12 <6 < 11 < 12 < 7 <7 < 35 < 12 08/06/20 - 08/27/20 < 5 < 6 < 13 < 5 < 11 < 5 < 9 < 14 < 6 <5 < 29 < 12 09/03/20 - 09/24/20 <6 <7 < 15 < 5 < 14 <7 < 10 < 10 < 6 < 6 < 24 < 8 10/01 /20 - 10/29/20 <6 < 6 < 13 < 7 < 10 < 6 < 10 < 10 <7 < 6 < 28 < 8 11/05/20 - 11/25/20 < 3 <5 < 10 < 5 < 10 <7 < 9 < 14 <7 <5 < 34 < 11 12/03/20 - 12/31/20 < 5 < 6 < 12 < 8 < 15 < 6 < 10 < 11 <7 <5 < 30 < 9 MEAN BD-55 01/03/20 - 01/16/20 < 2 < 3 <6 <2 < 5 <3 < 5 < 12 < 2 < 2 < 23 < 8 02/27/20 - 02/27/20 <5 <4 < 9 < 5 < 9 < 5 < 9 < 9 <5 <5 < 24 < 8 03/05/20 - 03/26/20 <8 <7 < 10 < 9 < 11 < 9 < 11 < 10 < 8 <7 < 29 < 11 n

I 04/02/20 - 04/30/20 < 7 <7 < 14 < 8 < 15 < 8 < 16 < 9 < 8 < 9 < 27 < 10

~ 05/07120 - 05/28/20 < 3 <4 < 8 <4 < 7 < 4 < 7 < 11 <4 < 3 < 24 < 9 06/04/20 - 06/25/20 <5 <4 < 8 < 5 < 8 < 5 < 9 < 12 < 5 <4 < 31 < 10 07/02/20 - 07/30/20 < 5 < 5 < 14 < 6 < 14 < 6 < 11 < 10 < 5 < 6 < 21 < 12 08/06/20

• 08/27/20 < 5 < 5 < 11 <5 < 9 <5 < 7 < 14 < 5 <5 < 38 < 12 09/03/20 - 09/24/20 <7 <7 < 15 <7 < 13 < 6 < 10 < 10 <8 < 6 < 25 < 10 10/01/20 - 10/29/20 < 5 < 6 < 12 <4 < 7 <5 < 10 < 9 < 6 <5 < 27 < 7 11 /05/20 - 11 /25/20 <4 <6 < 12 <6 < 10 <6 < 8 < 14 <5 <5 < 35 < 14 12/03/20 - 12/31/20 <5 < 5 < 12 < 5 < 9 <5 < 9 < 8 <5 <6 < 22 < 9 MEAN BD-56 01/03/20 - 01/16/20 <2 < 2 < 5 < 2 <4 < 2 <4 < 10 < 2 < 2 < 20 <7 02/06/20 - 02/27/20 < 5 <7 < 12 <5 < 14 <7 < 12 < 12 <7 < 6 < 32 < 13 03/05/20 - 03/26/20 < 7 <7 < 14 <8 < 15 <7 < 12 < 13 <7 < 8 < 31 < 8 04/02/20 - 04/30/20 <6 <7 < 13 <7 < 11 <8 < 12 < 8 <7 <5 < 27 <9 05107120 - 05/28/20 <4 <4 < 9 <4 < 10 <5 < 9 < 14 <5 <4 < 32 <8 06/04/20 - 06/25/20 < 5 < 6 < 11 < 6 < 10 < 6 < 8 < 13 < 6 <5 < 28 < 10 07/02/20 - 07/30/20 <5 <4 < 11 <6 < 8 <4 < 10 < 9 <5 <5 < 23 <8 08/06/20 - 08/27/20 <4 < 5 < 11 < 5 < 10 < 5 < 8 < 14 <5 <4 < 33 <9 09/03/20 - 09/24/20 <8 <6 < 14 <6 < 14 < 7 < 11 < 8 <6 <7 < 28 < 9 10/01 /20 - 10/29/20 < 6 < 6 < 9 < 8 < 14 <4 < 10 < 9 <7 <6 < 29 < 10 11 /05/20 - 11 /25/20 < 5 <6 < 14 < 5 < 10 < 5 <7 < 15 <5 <4 < 35 < 11 12/03/20 - 12/23/20 <4 <4 < 10 <4 < 9 < 5 <8 < 14 <4 < 5 < 30 < 9 MEAN

Table C-11.1 CONCENTRATIONS OF GROSS BETA IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/26/19 - 01 /30/20 4.6 +/- 1.6 01/30/20 - 02/27/20 < 2.4 02/27/20 - 03/26/20 8.4 +/- 1.7 03/26/20 - 04/30/20 2.9 +/- 1.4 04/30/20 - 05/28/20 5.2 +/- 1.6 05/28/20 - 06/25/20 2.1 +/- 1.4 06/25/20 - 07/30/20 4.0 +/- 1.5 07/30/20 - 08/27/20 3.2 +/- 1.6 08/27/20 - 09/24/20 3.5 +/- 1.7 09/24/20 - 10/29/20 4.0 +/- 1.7 10/29/20 - 11 /25/20 3.9 +/- 1.7 11/25/20 - 12/31/20 4.9 +/- 1.6 MEAN +/- 2 STD DEV 4.2 +/- 3.3 Table C-I1.2 CONCENTRATIONS OF TRITIUM IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/26/19 - 01/30/20 205 +/- 121 01 /30/20 - 02/27/20 402 +/- 130 02/27/20 - 03/26/20 203 +/- 127 03/26/20 - 04/30/20 600 +/- 128 04/30/20 - 05/28/20 375 +/- 123 05/28/20 - 06/25/20 899 +/- 284 06/25/20 - 07 /30/20 547 +/- 135 07/30/20 - 08/27/20 < 174 08/27/20 - 09/24/20 < 193 09/24/20 - 10/29/20 523 +/- 141 10/29/20 - 11 /25/20 < 161 11/25/20 - 12/31/20 1500 +/- 224 MEAN+/- 2 STD DEV 584 +/- 809 Table C-11.3 CONCENTRATIONS OF I-131 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/26/19 - 01/30/20 < 0.8 01/30/20 - 02/27/20 < 0.7 02/27/20 - 03/26/20 < 0.7 03/26/20 - 04/30/20 < 0.5 04/30/20 - 05/28/20 < 0.6 05/28/20 - 06/25/20 < 0.8 06/25/20 - 07/30/20 < 0.9 07/30/20 - 08/27/20 < 0.8 08/27/20 - 09/24/20 < 0.9 09/24/20 - 10/29/20 < 0.8 10/29/20 - 11/25/20 < 0.9 11/25/20 - 12/31/20 < 0.9 MEAN THE MEAN AND TWO STANDARD DEV/A TION ARE CALCULATED USING THE POSITIVE VALUES C-5

Table C-11.4 CONCENTRATIONS OF NICKEL-63 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/26/19 - 01/30/20 < 25 01/30/20 - 02/27/20 < 19 02/27/20 - 03/26/20 < 24 03/26/20 - 04/30/20 < 21 04/30/20 - 05/28/20 < 18 05/28/20 - 06/25/20 < 24 06/25/20 - 07/30/20 < 26 07/30/20 - 08/27/20 < 22 08/27/20 - 09/24/20 < 24 09/24/20 - 10/29/20 < 25 10/29/20 - 11 /25/20 < 25 11/25/20 - 12/31/20 < 28 MEAN Table C-11.5 CONCENTRATIONS OF IRON-55 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/26/19 - 01/30/20 < 72 01 /30/20 - 02/27/20 < 170 02/27/20 - 03/26/20 < 83 03/26/20 - 04/30/20 < 97 04/30/20 - 05/28/20 < 102 05/28/20 - 06/25/20 < 83 06/25/20 - 07/30/20 < 55 07/30/20 - 08/27/20 < 132 08/27/20 - 09/24/20 < 168 09/24/20 - 10/29/20 < 106 10/29/20 - 11 /25/20 < 105 11/25/20 - 12/31/20 < 89 MEAN C-6

Table C-11.6 CONCENTRATIONS OF GAMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-22 12/26/19 - 01/30/20 < 6 < 6 < 15 <7 < 15 < 6 < 13 <7 <6 < 34 < 10 01/30/20 - 02/27/20 <4 <4 < 7 <4 <7 <4 <7 < 4 <4 < 19 < 5 02/27/20 - 03/26/20 <4 <4 < 7 <4 <8 < 4 <6 <4 <4 < 26 < 10 03/26/20 - 04/30/20 < 6 <6 < 15 < 6 < 12 < 6 < 14 <6 <6 < 29 < 10 04/30/20 - 05/28/20 <4 < 5 < 11 <5 < 8 < 5 <8 < 5 <5 < 32 < 12 05/28/20 - 06/25/20 < 2 < 2 <4 <2 < 3 < 2 <3 < 2 < 2 < 14 < 5 06/25/20 - 07/30/20 < 7 < 5 < 12 < 7 < 11 < 6 <8 < 6 <7 < 32 < 13 07/30/20 - 08/27/20 <2 < 2 < 5 <2 < 4 < 2 <4 < 2 <2 < 18 < 5 08/27120 - 09/24/20 < 1 < 2 <4 < 1 < 3 < 2 < 3 < 1 < 1 < 19 < 7 09/24/20 - 10/29/20 < 9 < 7 < 12 <7 < 17 < 8 < 14 < 8 < 8 < 29 < 7 10/29/20 - 11 /25/20 < 3 < 3 < 6 < 3 < 6 < 3 < 6 < 3 < 3 < 19 < 6 11/25/20 - 12/31/20 < 7 < 7 < 18 < 8 < 14 < 8 < 12 < 9 < 9 < 33 < 10 0 MEAN

Table C-111.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 01/10/20 - 01/10/20 < 176 < 178 < 178 < 178 < 174 < 179 < 182 < 179 04/09/20 - 04/09/20 < 178 < 163 < 176 < 175 < 176 < 174 < 173 < 175 07/09/20 - 07/09/20 < 191 < 195 < 196 < 190 < 187 < 192 < 191 < 188 10/08/20 - 10/08/20 < 190 < 186 < 188 < 186 < 186 < 188 < 188 < 187 MEAN C-8

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-13 01/10/20 - 01/10/20 < 9 < 7 < 20 < 6 < 12 <9 < 12 < 11 < 8 < 8 < 36 < 13 04/09/20 - 04/09/20 < 7 < 5 < 15 < 6 < 13 <6 < 11 < 10 < 6 < 7 < 27 < 8 07/09/20 - 07/09/20 < 7 < 9 < 17 < 10 < 12 < 8 < 15 < 11 < 7 < 9 < 39 < 12 10/08/20 - 10/08/20 < 5 < 5 < 9 < 5 < 11 < 5 < 9 < 8 < 6 < 6 < 21 < 7 MEAN BD-34 01/10/20 - 01/10/20 < 7 < 8 < 9 < 6 < 12 <7 < 11 < 8 < 8 < 7 < 30 < 12 04/09/20 - 04/09/20 < 6 < 6 < 16 < 10 < 17 < 8 < 11 < 11 < 7 < 7 < 36 < 10 07/09/20 - 07/09/20 <7 < 9 < 17 < 9 < 16 <9 < 12 < 12 < 9 < 9 < 32 < 7 10/08/20 - 10/08/20 <4 <4 < 10 < 5 < 8 <4 < 9 < 6 < 5 < 5 < 19 < 7 MEAN C)

I co BD-35 01/10/20 - 01/10/20 < 7 < 6 < 11 < 6 < 17 < 9 < 11 < 9 < 7 < 7 < 25 < 12 04/09/20 - 04/09/20 <6 < 6 < 15 <7 < 18 < 8 < 13 < 8 < 8 < 7 < 21 < 13 07/09/20 - 07/09/20 < 7 < 8 < 16 <8 < 17 < 8 < 13 < 11 < 7 < 8 < 35 < 10 10/08/20 - 10/08/20 < 5 < 5 < 8 <4 < 9 < 5 < 8 < 7 < 5 < 5 < 22 <7 MEAN BD-36 01/10/20 - 01/10/20 <4 <4 < 8 < 3 < 9 < 5 < 7 < 6 <4 <4 < 18 < 6 04/09/20 - 04/09/20 < 7 < 7 < 14 < 9 < 23 < 8 < 15 < 12 <8 < 10 < 32 < 14 07/09/20 - 07/09/20 < 8 < 8 < 18 < 9 < 13 < 7 < 16 < 9 <8 < 8 < 32 < 9 10/08/20 - 10/08/20 < 6 < 6 < 11 <7 < 12 < 7 < 8 < 8 < 5 < 6 < 24 < 8 MEAN BD-37 01/10/20 - 01/10/20 < 6 < 6 < 17 < 8 < 16 <7 < 13 < 10 <7 < 7 < 25 < 11 04/09/20 - 04/09/20 < 5 < 7 < 13 < 7 < 15 <7 < 12 <9 < 9 < 8 < 31 < 10 07/09/20 - 07/09/20 <6 < 5 < 10 < 6 < 13 <6 < 13 <9 < 6 < 7 < 30 < 9 10/08/20 - 10/08/20 < 5 < 5 < 10 < 5 < 9 < 5 < 8 <6 < 5 < 5 < 19 <4 MEAN

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 BD-50 01/10/20 - 01/10/20 < 9 <7 < 16 < 6 < 13 < 8 < 15 < 11 < 9 < 8 < 38 < 7 04/09/20 - 04/09/20 < 6 < 6 < 10 < 6 < 13 < 7 < 8 < 7 <7 < 7 < 21 < 8 07/09/20 - 07/09/20 < 6 < 8 < 10 < 9 < 17 < 9 < 15 < 9 <6 < 6 < 30 < 8 10/08/20 - 10/08/20 < 5 < 5 < 12 < 6 < 10 < 5 < 8 < 7 <4 < 5 < 23 < 7 MEAN BD-51 01/10/20 - 01 /10/20 < 6 < 5 < 15 < 7 < 11 < 9 < 11 < 10 < 6 < 6 < 29 < 10 04/09/20 - 04/09/20 <7 < 7 < 15 < 7 < 14 < 7 < 11 < 10 < 8 < 8 < 32 < 9 07/09/20 - 07/09/20 < 6 < 7 < 16 < 8 < 13 < 6 < 12 < 9 < 8 < 7 < 35 < 10 10/08/20 - 10/08/20 <7 < 5 < 10 < 7 < 10 < 6 < 10 <6 < 6 < 5 < 19 < 9 MEAN 0I

..lo.

0 BD-54 01/10/20 - 01/10/20 < 7 < 7 < 17 < 10 < 14 < 7 < 15 < 10 < 9 < 8 < 36 < 13 04/09/20 - 04/09/20 < 5 <6 < 12 <6 < 13 < 8 < 12 < 10 < 7 < 7 < 26 < 8 07/09/20 - 07/09/20 < 6 < 5 < 9 < 5 <7 < 7 < 10 < 10 < 6 <6 < 29 < 8 10/08/20 - 10/08/20 < 6 < 5 < 13 <6 < 13 < 8 < 9 < 10 < 7 < 7 < 33 < 12 MEAN

Table C-IV.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RES ULTS 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 Quillback 05/13/20 < 98 < 45 < 41 < 38 < 98 < 37 < 90 < 43 < 61 < 63 < 46 < 41 < 212 < 84 Golden Redhorse 05/13/20 < 196 < 52 < 35 < 31 < 70 < 43 < 77 < 38 < 63 < 52 < 43 < 38 < 187 < 53 Flathead Catfish 10/08/20 < 81 < 222 < 72 < 80 < 144 < 74 < 112 < 63 < 153 < 115 < 73 < 67 < 336 < 104 Smallmouth Bass 10/08/20 < 160 < 167 < 61 < 45 < 127 < 75 < 93 < 53 < 81 < 87 < 41 < 54 < 280 < 77 MEAN BD-28 Golden Redhorse 05/13/20 < 252 < 65 < 56 < 56 < 116 < 60 < 125 < 56 < 107 < 98 < 60 < 62 < 275 < 80 Quillback 05/13/20 < 218 < 70 < 49 < 42 < 80 < 50 < 99 < 45 < 87 < 91 < 60 < 54 < 231 < 71 0I Smallmouth Bass 10/08/20 < 250 < 166 < 63 < 57 < 155 < 90 < 191 < 77 < 128 < 134 < 76 < 62 < 324 < 103

..lo. Channel Catfish 10/08/20 < 247 < 183 < 35 < 53 < 139 < 51 < 117 < 64 < 108 < 81 < 73 < 52 < 264 < 98

..lo.

MEAN BD-41 Channel Catfish 05/13/20 < 248 < 38 < 34 < 28 < 68 < 33 < 66 < 34 < 56 < 68 < 36 < 35 < 180 < 37 Largemouth Bass 05/13/20 < 250 < 30 < 45 < 54 < 109 < 61 < 112 < 71 < 70 < 112 < 59 < 54 < 231 < 82 Common Carp 10/08/20 < 132 < 232 < 69 < 61 < 122 < 74 < 141 < 67 < 100 < 93 < 70 < 48 < 258 < 99 Largemouth Bass 10/08/20 < 228 < 201 < 39 < 53 < 102 < 53 < 110 < 61 < 72 < 85 < 53 < 62 < 259 < 52 MEAN

Table C-V.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 06/08/20 < 2000 < 248 < 93 < 82 < 176 < 109 < 243 < 110 < 156 < 119 < 131 < 378 < 137 10/13/20 < 833 < 243 < 78 < 61 < 179 < 74 < 184 < 82 < 114 < 74 < 102 < 316 < 114 MEAN BD-25 06/08/20 < 1917 < 186 < 97 < 90 < 170 < 92 < 194 < 97 < 176 < 111 < 123 < 389 < 144 10/13/20 < 1642 < 192 < 51 < 46 < 102 < 65 < 137 < 64 < 107 < 64 < 57 < 326 < 68 MEAN BD-57 06/08/20 < 1867 < 237 < 102 < 92 < 227 < 102 < 272 < 103 < 193 < 121 < 149 < 431 < 118 10/13/20 < 1735 < 193 < 58 < 65 < 158 < 64 < 198 < 92 < 126 < 76 < 81 < 342 < 98

() MEAN I

~

I\)

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 12/26/19 - 01/03/20 24 +/- 4 20 +/- 4 22 +/- 4 24 +/- 4 20 +/- 4 19 +/- 4 24 +/- 4 21 +/- 4 01 /03/20 - 01/10/20 14 +/- 4 13 +/- 4 12 +/- 4 14 +/- 4 12 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 01/10/20 - 01/16/20 15 +/- 4 19 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 14 +/- 4 14 +/- 4 01/16/20 - 01/23/20 19 +/- 4 18 +/- 4 17 +/- 4 18 +/- 4 19 +/- 5 21 +/- 5 14 +/- 4 20 +/- 5 01/23/20 - 01/30/20 12 +/- 4 13 +/- 4 13 +/- 4 12 +/- 3 12 +/- 4 15 +/- 4 11 +/- 4 15 +/- 4 01 /30/20 - 02/06/20 10 +/- 3 10 +/- 3 10 +/- 3 12 +/- 4 8 +/- 3 8 +/- 3 12 +/- 4 12 +/- 4 02/06/20 - 02/13/20 14 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4 12 +/- 4 10 +/- 3 13 +/- 4 13 +/-4 02/13/20 - 02/20/20 13 +/- 4 15 +/- 4 15 +/- 4 12 +/- 4 11 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 02/20/20 - 02/27/20 19 +/- 4 22 +/- 4 20 +/- 4 20 +/- 4 22 +/- 5 21 +/- 5 19 +/- 4 21 +/- 5 02/27/20 - 03/05/20 7 +/- 3 11 +/- 4 9 +/- 3 11 +/- 4 10 +/- 4 10 +/- 4 14 +/- 4 11 +/- 4 03/05/20 - 03/12/20 15 +/- 4 15 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 15 +/- 4 14 +/- 4 16 +/- 4 03/12/20 - 03/19/20 11 +/- 4 13 +/- 4 17 +/- 4 13 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 15 +/- 4 03/19/20 - 03/26/20 16 +/-4 14 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 16 +/- 4 03/26/20 - 04/02/20 11 +/- 4 12 +/- 4 10 +/- 4 8 +/- 4 7 +/- 3 10 +/- 4 10 +/- 4 10 +/- 4 04/02/20 - 04/09/20 13 +/-4 17 +/- 4 18 +/- 4 13 +/- 4 17 +/- 4 22 +/- 5 17 +/- 4 13 +/- 4 04/09/20 - 04/16/20 9 +/- 4 11 +/- 4 13 +/- 4 12 +/- 4 10 +/- 4 11 +/- 4 10 +/- 4 13 +/- 4 04/16/20 - 04/23/20 14 +/- 4 17 +/- 4 15 +/- 4 16 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 19 +/- 5 04/23/20 - 04/30/20 13 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 11 +/- 3 18 +/- 4 16 +/- 4 13 +/-4 04/30/20 - 05/07/20 8 +/- 4 9 +/- 4 11 +/- 4 9 +/- 4 7 +/- 4 8 +/- 4 8 +/- 4 11 +/- 4 05/07/20 - 05/14/20 12 +/-4 11 +/- 4 11 +/- 4 14 +/- 4 12 +/- 3 11 +/- 4 12 +/- 4 11 +/-4 05/14/20 - 05/21/20 8 +/-4 6 +/- 4 7 +/- 4 < 5 6 +/- 4 7 +/- 4 7 +/- 4 8 +/-4 05/21 /20 - 05/28/20 9 +/-4 8 +/- 4 8 +/- 4 7 +/- 4 11 +/- 4 10 +/- 4 12 +/- 4 8 +/- 4 05/28/20 - 06/04/20 10 +/- 4 11 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 10 +/- 4 13 +/- 4 13 +/- 4 06/04/20 - 06/11 /20 15 +/- 4 16 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 14 +/- 4 16 +/- 4 06/11/20 - 06/18/20 11 +/- 4 11 +/- 4 16 +/- 5 14 +/- 4 14 +/- 4 16 +/- 4 16 +/- 5 14 +/- 4 06/18/20 - 06/25/20 17 +/- 4 20 +/- 5 21 +/- 5 20 +/- 4 20 +/- 4 21 +/- 5 19 +/- 4 25 +/- 5 06/25/20 - 07/02/20 13 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 12 +/- 4 07/02/20 - 07/09/20 24 +/- 5 22 +/- 5 21 +/- 5 20 +/- 5 21 +/- 5 24 +/- 5 19 +/- 4 29 +/- 5 07/09/20 - 07/16/20 17 +/- 4 17 +/- 4 13 +/- 4 13 +/- 4 18 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 07/16/20 - 07/23/20 14 +/- 4 19 +/- 4 20 +/- 5 17 +/- 4 16 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 07/23/20 - 07/30/20 11 +/- 4 13 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 14 +/- 5 14 +/- 4 16 +/- 5 07/30/20 - 08/06/20 12 +/- 4 9 +/- 4 12 +/- 4 11 +/- 4 9 +/- 4 8 +/- 4 12 +/- 4 13 +/- 4 08/06/20 - 08/13/20 22 +/- 5 19 +/- 4 22 +/- 5 19 +/- 4 24 +/- 6 19 +/- 4 20 +/- 4 16 +/- 5 08/13/20 - 08/20/20 16 +/- 4 16 +/- 4 20 +/- 4 18 +/- 4 17 +/- 4 19 +/- 4 17 +/- 4 15 +/- 4 08/20/20 - 08/27/20 17 +/- 4 23 +/- 5 26 +/- 5 21 +/- 4 23 +/- 5 23 +/- 5 21 +/- 5 21 +/- 4 08/27/20 - 09/03/20 18 +/- 4 19 +/- 4 18 +/- 4 15 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 19 +/- 4 09/03/20 - 09/10/20 11 +/- 4 9 +/- 4 8 +/- 3 10 +/- 4 11 +/- 3 8 +/- 3 10 +/- 3 11 +/- 4 09/10/20 - 09/17/20 13 +/- 4 13 +/- 4 13 +/- 4 15 +/- 4 13 +/- 4 12 +/- 4 13 +/- 4 13 +/- 4 09/17/20 - 09/24/20 23 +/- 5 24 +/- 5 22 +/- 4 24 +/- 5 23 +/- 4 27 +/- 4 25 +/- 5 28 +/- 5 09/24/20 - 10/01 /20 17 +/- 4 18 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 14 +/- 4 12 +/- 4 17 +/- 4 10/01 /20 - 10/08/20 15 +/- 4 14 +/- 4 12 +/- 4 15 +/- 4 14 +/- 4 13 +/- 4 11 +/- 4 15 +/- 4 10/08/20 - 10/15/20 24 +/- 5 22 +/- 5 23 +/- 5 18 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 24 +/- 5 10/15/20 - 10/22/20 19 +/- 5 16 +/- 5 22 +/- 5 17 +/- 5 18 +/- 4 18 +/- 4 16 +/- 4 18 +/- 5 10/22/20 - 10/29/20 14 +/- 4 17 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 10/29/20 - 11 /05/20 27 +/- 5 21 +/- 5 27 +/- 5 23 +/- 5 24 +/- 5 22 +/- 5 23 +/- 5 24 +/- 5 11/05/20 - 11/12/20 12 +/- 4 14 +/- 4 14 +/- 4 17 +/- 4 14 +/- 4 14 +/-4 14 +/- 4 17 +/- 4 11/12/20 - 11/19/20 25 +/- 5 25 +/- 5 24 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 20 +/- 4 21 +/- 4 11 /19/20 - 11 /25/20 21 +/- 5 21 +/- 5 22 +/- 5 20 +/- 5 19 +/- 5 20 +/- 5 21 +/- 5 17 +/- 5 11 /25/20 - 12/03/20 18 +/- 4 13 +/- 3 15 +/- 3 17 +/- 3 17 +/- 3 16 +/- 3 14 +/- 3 13 +/- 3 12/03/20 - 12/10/20 28 +/- 5 30 +/- 5 32 +/- 5 30 +/- 5 32 +/- 5 34 +/- 5 34 +/- 5 31 +/- 5 12/10/20 - 12/17/20 21 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 18 +/- 4 16 +/-4 12/17/20 - 12/23/20 31 +/- 6 32 +/- 6 29 +/- 5 31 +/- 6 28 +/- 5 30 +/- 5 33 +/- 6 30 +/- 5 12/23/20 - 12/31/20 15 +/- 4 18 +/- 4 15 +/- 4 19 +/- 4 18 +/- 4 21 +/- 4 18 +/- 4 23 +/- 5 MEAN +/- 2 STD DEV 16 +/- 11 16 +/- 11 16 +/- 11 16 +/- 10 16 +/- 11 16 +/- 11 16 +/- 10 17 +/- 11 THE MEAN AND TWO STANDARD DEV/AT/ON ARE CALCULATED USING THE POSITIVE VALUES 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, 2020 RES ULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - 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 12/26/19 - 01/30/20 12 24 16 +/- 8 12/26/19 - 01 /30/20 11 24 16 +/- 8 12/26/19 - 01/30/20 14 21 17 +/- 7 01/30/20 - 02/27/20 10 22 14 +/- 8 01/30/20 - 02/27/20 8 22 14 +/- 10 01 /30/20 - 02/27/20 12 21 15 +/- 8 02/27/20 - 03/26/20 7 17 13 +/- 6 02/27/20 - 03/26/20 10 16 13 +/- 4 02/27/20 - 03/26/20 11 16 14 +/- 5 03/26/20 - 04/30/20 8 18 13 +/- 5 03/26/20 - 04/30/20 7 22 13 +/- 8 03/26/20 - 04/30/20 10 19 13 +/- 7 04/30/20 - 06/04/20 6 14 10 +/- 4 04/30/20 - 06/04/20 6 13 10 +/- 5 04/30/20 - 06/04/20 8 13 10 +/- 4 06/04/20 - 06/25/20 11 21 16 +/- 6 06/04/20 - 06/25/20 14 21 17 +/- 5 06/04/20 - 06/25/20 14 25 18 +/- 11 06/25/20 - 07/30/20 11 24 16 +/- 7 06/25/20 - 07/30/20 13 24 17 +/- 6 06/25/20 - 07/30/20 12 29 18 +/- 13 07/30/20 - 09/03/20 9 26 18 +/- 9 07/30/20 - 09/03/20 8 24 18 +/- 10 07/30/20 - 09/03/20 13 21 17 +/- 7 09/03/20 - 09/24/20 8 24 15 +/- 12 09/03/20 - 09/24/20 8 27 16 +/- 14 09/03/20 - 09/24/20 11 28 17 +/- 18 09/24/20 - 10/29/20 12 24 17 +/- 6 09/24/20 - 10/29/20 11 20 15 +/- 6 09/24/20 - 10/29/20 15 24 18 +/- 7 10/29/20 - 12/03/20 12 27 20 +/- 9 10/29/20 - 12/03/20 14 24 18 +/- 7 10/29/20 - 12/03/20 13 24 18 +/- 8 0I 12/03/20 - 12/31 /20 15 32 24 +/- 14 12/03/20 - 12/31/20 15 34 25 +/- 15 12/03/20 - 12/31/20 16 31 25 +/- 14

..I,.

~

12/26/19 - 12/31/20 6 32 16 +/- 11 12/26/19 - 12/31/20 6 34 16 +/- 11 12/26/19 - 12/31/20 8 31 17 +/- 11 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, 2020 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 12/26/19 - 03/26/20 <: 3 <: 2 <: 3 <: 3 <: 5 <: 2 <: 5 <: 2 <: 3 < 18 <: 5 03/26/20 - 06/25/20 <: 2 <: 3 <: 5 <: 3 <: 6 <: 2 <: 3 <: 2 <: 2 < 15 <: 6 06/25/20 - 09/24/20 <: 3 <: 4 <: 8 <: 5 < 10 <: 4 <: 8 <: 4 <: 3 < 51 < 18 09/24/20 - 12/31/20 <: 2 <: 2 <: 5 <: 3 <: 6 <: 2 <: 4 <: 3 <: 2 < 13 <: 5 MEAN BD-03 12/26/19 - 03/26/20 <: 2 <: 2 <: 4 <: 2 <: 5 <: 2 <: 3 <: 2 <: 2 < 14 <: 6 03/26/20 - 06/25/20 <: 2 <: 2 <: 5 <: 2 <: 3 <: 2 <: 5 <: 2 <: 1 < 15 <: 6 06/25/20 - 09/24/20 <: 3 <: 2 <: 5 <: 3 <: 6 <: 2 <: 4 <: 3 <: 2 < 25 < 11 09/24/20 - 12/31 /20 <: 2 <: 2 <: 3 <: 2 <: 4 <: 2 <: 3 <: 2 <: 2 < 10 <: 4 MEAN 0I

(,J1 BD-04 12/26/19 - 03/26/20 <: 2 <: 2 <: 4 <: 2 <: 5 <: 3 <: 4 <: 2 <: 2 < 13 <: 6 03/26/20 - 06/25/20 <: 3 <: 3 <: 7 <: 3 <: 7 <: 2 <: 5 <: 3 <: 3 < 27 <: 10 06/25/20 - 09/24/20 <: 1 <: 2 <: 6 <: 2 <: 5 <: 3 <: 3 <: 2 <: 2 < 27 <: 8 09/24/20 - 12/31 /20 <: 2 <: 2 <: 3 <: 2 <: 4 <: 2 <: 4 <: 2 <: 2 <: 8 <: 4 MEAN BD-05 12/26/19 - 03/26/20 <: 3 <: 3 <: 9 <: 4 <: 8 <: 4 <: 8 <: 3 <: 3 < 25 <: 7 03/26/20 - 06/25/20 <: 4 <: 4 <: 8 <: 4 <: 6 <: 4 <: 8 <: 4 <: 4 < 39 < 15 06/25/20 - 09/24/20 <: 2 <: 2 <: 8 <: 2 <: 7 <: 3 <: 4 <: 2 <: 2 < 23 < 11 09/24/20 - 12/31/20 <: 3 <: 3 <: 5 <: 2 <: 6 <: 3 <: 5 <: 2 <: 2 < 14 <: 5 MEAN BD-06 12/26/19 - 03/26/20 <: 3 <: 3 <: 4 <: 2 <: 6 <: 2 <: 4 <: 3 <: 2 <: 17 <: 5 03/26/20 - 06/25/20 <: 2 <: 2 <: 5 <: 2 <: 8 <: 3 <: 4 <: 2 <: 2 < 21 <: 8 06/25/20 - 09/24/20 <: 3 <: 3 <: 7 <: 3 <: 8 <: 4 <: 6 <: 3 <: 2 < 42 < 12 09/24/20 - 12/31/20 <: 3 <: 4 <: 7 <: 3 <: 9 <: 3 <: 7 <: 4 <: 4 < 20 <: 5 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 12/26/19 - 03/26/20 < 2 < 2 <3 < 2 < 6 < 2 < 5 < 1 < 2 < 9 < 8 03/26/20 - 06/25/20 <2 < 3 <6 < 2 < 6 <3 < 4 <3 < 2 < 18 < 3 06/25/20 - 09/24/20 < 2 < 2 <7 < 2 <7 <3 < 5 < 2 < 2 < 34 < 11 09/24/20 - 12/31/20 <2 < 2 < 3 < 2 <4 <2 < 3 < 2 < 2 < 10 < 3 MEAN BD-20 12/26/19 - 03/26/20 < 2 <2 < 6 < 3 <4 < 2 <4 <3 < 3 < 18 <7 03/26/20 - 06/25/20 < 3 < 3 < 5 < 3 < 5 < 3 <4 <3 < 2 < 25 <7 06/25/20 - 09/24/20 <4 < 5 < 11 <4 < 12 < 5 < 8 <4 <4 < 58 < 22 09/24/20 - 12/31/20 < 2 < 2 <4 < 3 < 5 < 2 < 3 < 2 < 2 < 9 < 5 MEAN C')

I

~

CD BD-21 12/26/19 - 03/26/20 < 2 < 2 < 6 < 2 < 5 < 2 < 3 < 2 < 2 < 14 <4 03/26/20 - 06/25/20 <4 < 3 < 11 <4 < 9 <4 < 7 < 5 < 3 < 30 < 16 06/25/20 - 09/24/20 < 2 < 3 < 5 < 3 <4 < 2 <4 < 3 < 2 < 28 < 10 09/24/20 - 12/31/20 < 2 < 2 < 5 < 3 < 6 < 2 < 3 < 2 < 2 < 15 <4 MEAN

Table C-Vll.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF E-3 PCI/CU METER+/- 2 SIGMA GROUP I - NEAR FIELD GROUP Ill -

GROUP II - FAR FIELD COLLECTION CONTROL PERIOD BD-06 BD-19 BD-20 BD-21 BD-02 BD-04 BD-05 BD-03 12/26/19 - 01/03/20 < 16 < 15 < 15 < 15 < 19 < 18 < 18 < 18 01/03/20 - 01/10/20 < 54 < 54 < 54 < 23 < 28 < 30 < 53 < 28 01/10/20 - 01/16/20 < 33 < 31 < 31 < 31 < 28 < 30 < 27 < 29 01/16/20 - 01/23/20 < 39 < 38 < 38 < 38 < 26 < 28 < 26 < 26 01/23/20 - 01/30/20 < 34 < 33 < 13 < 32 < 26 < 28 < 27 < 27 01/30/20 - 02/06/20 < 24 < 12 < 26 < 26 < 25 < 25 < 25 < 12 02/06/20 - 02/13/20 < 35 < 34 < 35 < 35 < 28 < 30 < 28 < 29 02/13/20 - 02/20/20 < 50 < 49 < 49 < 48 < 32 < 34 < 32 < 34 02/20/20 - 02127120 < 27 < 13 < 26 < 28 < 45 < 49 < 46 < 48 02/27/20 - 03/05/20 < 32 < 32 < 31 < 34 < 38 < 38 < 39 < 39 03/05/20 - 03/12/20 < 46 < 45 < 46 < 48 < 28 < 30 < 28 < 29 03/12/20 - 03/19/20 < 32 < 32 < 31 < 34 < 42 < 43 < 41 < 43 03/19/20 - 03/26/20 < 29 < 28 < 28 < 28 < 50 < 53 < 55 < 51 03/26/20 - 04/02/20 < 23 < 22 < 22 < 24 < 24 < 24 < 25 < 24 04/02/20 - 04/09/20 < 36 < 38 < 37 < 38 < 45 < 49 < 47 < 47 04/09/20 - 04/16/20 < 34 < 34 < 34 < 14 < 51 < 54 < 52 < 52 04/16/20 - 04/23/20 < 37 < 39 < 39 < 40 < 34 < 36 < 36 < 36 04/23/20 - 04/30/20 < 63 < 63 < 63 < 62 < 37 < 38 < 38 < 36 04/30/20 - 05/07/20 < 18 < 32 < 34 < 33 < 44 < 44 < 46 < 44 05/07120 - 05/14/20 < 39 < 41 < 39 < 40 < 23 < 25 < 24 < 25 05/14/20 - 05/21 /20 < 27 < 27 < 29 < 28 < 40 < 41 < 40 < 41 05/21 /20 - 05/28/20 < 43 < 46 < 45 < 45 < 50 < 47 < 47 < 46 05/28/20 - 06/04/20 < 27 < 27 < 28 < 29 < 45 < 43 < 47 < 46 06/04/20 - 06/11/20 < 48 < 48 < 49 < 21 < 25 < 28 < 27 < 26 06/11 /20 - 06/18/20 < 44 < 45 < 47 < 47 < 35 < 36 < 15 < 36 06/18/20 - 06/25/20 < 37 < 21 < 22 < 21 < 35 < 38 < 37 < 17 06/25/20 - 07/02/20 < 37 < 38 < 39 < 39 < 67 < 68 < 70 < 68 07102/20 - 07109/20 < 55 < 57 < 57 < 57 < 29 < 32 < 30 < 31 07/09/20 - 07/16/20 < 27 < 27 < 28 < 28 < 46 < 47 < 48 < 47 07/16/20 - 07/23/20 < 36 < 36 < 38 < 38 < 46 < 49 < 47 < 47 07/23/20 - 07/30/20 < 41 < 42 < 42 < 43 < 50 < 56 < 52 < 54 07/30/20 - 08/06/20 < 30 < 15 < 31 < 30 < 35 < 33 < 36 < 35 08/06/20 - 08/13/20 < 35 < 33 < 33 < 28 < 23 < 42 < 41 < 51 08/13/20 - 08/20/20 < 22 < 21 < 21 < 21 < 44 < 45 < 45 < 44 08/20/20 - 08/27/20 < 28 < 29 < 29 < 29 < 11 < 26 < 26 < 26 08/27/20 - 09/03/20 < 59 < 61 < 62 < 61 < 59 < 59 < 63 < 62 09/03/20 - 09/10/20 < 48 < 45 < 45 < 47 < 38 < 32 < 39 < 39 09/10/20 - 09/17/20 < 46 < 19 < 47 < 46 < 41 < 41 < 41 < 41 09/17/20 - 09/24/20 < 49 < 47 < 47 < 48 < 50 < 20 < 52 < 52 09/24/20 - 10/01 /20 < 58 < 56 < 23 < 57 < 27 < 27 < 28 < 29 10/01 /20 - 10/08/20 < 35 < 35 < 35 < 36 < 31 < 31 < 32 < 32 10/08/20 - 10/15/20 < 40 < 18 < 41 < 41 < 42 < 42 < 42 < 42 10/15/20 - 10/22/20 < 47 < 48 < 47 < 47 < 45 < 45 < 47 < 47 10/22/20 - 10/29/20 < 49 < 47 < 48 < 49 < 46 < 43 < 46 < 44 10/29/20 - 11 /05/20 < 55 < 56 < 56 < 57 < 39 < 37 < 42 < 40 11 /05/20 - 11 /12/20 < 36 < 35 < 35 < 36 < 29 < 31 < 31 < 31 11/12/20 - 11/19/20 < 41 < 42 < 41 < 41 < 31 < 32 < 17 < 32 11/19/20 - 11/25/20 < 61 < 59 < 60 < 61 < 29 < 30 < 31 < 31 11 /25/20 - 12/03/20 < 56 < 52 < 54 < 53 < 24 < 23 < 27 < 25 12/03/20 - 12/10/20 < 53 < 52 < 53 < 54 < 44 < 46 < 46 < 47 12/10/20 12/17/20 < 34 < 32 < 32 < 33 < 24 < 23 < 23 < 23 12/17/20 - 12/23/20 < 51 < 51 < 50 < 51 < 19 < 42 < 44 < 43 12/23/20 - 12/31/20 < 52 < 51 < 52 < 53 < 33 < 33 < 36 < 40 MEAN C-17

Table C-Vlll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION CONTROL FARM PERIOD BD-18 01/02/20 < 0.6 02/06/20 < 0.7 03/04/20 < 0.9 04/01/20 < 0.5 05/01/20 < 0.7 05/06/20 < 0.9 05/21/20 < 0.9 06/03/20 < 0.9 06/18/20 < 0.9 07/01/20 < 0.7 07/16/20 < 0.9 07/29/20 < 0.7 08/13/20 < 0.9 08/27/20 < 0.9 09/10/20 < 0.9 09/24/20 < 0.9 10/07/20 < 0.8 10/22/20 < 0.8 11/04/20 < 0.9 12/2020 (1)

MEAN (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-18

Table C-Vlll.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-18 01/02/20 < 8 < 8 < 18 < 8 < 17 < 8 < 14 < 9 < 8 < 30 < 7 02/06/20 < 7 < 7 < 11 < 7 < 15 < 6 < 10 < 7 < 6 < 22 < 10 03/04/20 < 8 < 7 < 19 < 8 < 17 < 8 < 13 < 10 < 9 < 38 < 11 04/01/20 < 4 <4 < 9 < 5 < 10 < 5 < 8 < 5 < 5 < 18 < 6 05/01/20 < 5 < 7 < 17 < 8 < 13 < 6 < 13 < 8 < 8 < 30 < 10 05/06/20 < 8 < 8 < 17 < 11 < 17 < 9 < 16 < 8 < 9 < 33 < 12 05/21120 < 7 < 8 < 22 < 6 < 18 < 8 < 14 < 7 < 8 < 36 < 12 06/03/20 < 8 < 7 < 18 < 9 < 20 < 9 < 11 < 9 < 8 < 33 < 13 06/18120 < 8 < 8 < 20 < 8 < 20 < 8 < 12 < 9 < 8 < 33 < 9 07101120 < 6 < 6 < 14 < 11 < 13 < 7 < 12 < 7 < 6 < 25 < 7 07116120 < 7 < 10 < 15 < 8 < 20 < 9 < 13 < 10 < 8 < 35 < 8 07/29/20 < 7 < 9 < 13 < 10 < 17 < 8 < 16 < 10 < 8 < 39 < 10 08113120 < 8 < 7 < 16 < 10 < 19 < 9 < 15 < 8 < 7 < 43 < 10 08/27120 < 6 < 9 < 21 < 6 < 19 < 7 < 15 <8 < 7 < 35 < 9 0 I

....i. 09110120 < 8 < 8 < 12 < 7 < 15 < 8 < 12 < 8 < 7 < 25 < 11

<D 09124120 < 9 < 8 < 21 < 7 < 22 < 8 < 14 < 10 < 8 < 38 < 12 10/07/20 < 9 < 9 < 16 < 10 < 17 < 9 < 15 < 9 < 10 < 34 < 11 10/22/20 < 8 < 8 < 19 < 8 < 21 < 8 < 13 < 10 < 9 < 30 < 11 11/04/20 < 5 < 6 < 11 < 6 < 13 < 6 < 10 < 7 < 6 < 26 < 8 12/2020 (1)

MEAN Table C-Vlll.3 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 No Substitute Grass Samples Taken in 2020 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 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 Swiss/Green Chard 07/29/20 < 26 < 36 < 80 < 40 < 68 < 37 < 60 < 45 < 39 < 33 < 157 < 39 Cabbage 07/29/20 < 40 < 40 < 96 < 44 < 72 < 41 < 76 < 56 < 46 < 38 < 161 < 27 Collard Greens 07/29/20 < 40 < 34 < 84 < 37 < 88 < 31 < 56 < 50 < 38 < 40 < 145 < 46 Cabbage 08/27/20 < 48 < 29 < 72 < 60 < 112 < 50 < 62 < 59 < 51 < 41 < 179 < 39 Cabbage 09/24/20 < 31 < 29 < 74 < 36 < 76 < 43 < 67 < 43 < 38 < 43 < 150 < 36 Collard Greens 09/24/20 < 43 < 43 < 78 < 50 < 85 < 51 < 88 < 56 < 51 < 33 < 179 < 49 Turnip 09/24/20 < 32 < 29 < 67 < 30 < 77 < 33 < 58 < 42 < 32 < 27 < 132 < 39 MEAN BO-QUAD 2 Cabbage Leaves 07/30/20 < 40 < 42 < 85 < 32 < 89 < 32 < 60 < 55 < 47 < 48 < 179 < 43 Onions 07/30/20 < 29 < 32 < 66 < 36 < 75 < 33 < 49 < 52 < 29 < 32 < 128 < 42 Green Cabbage 09/03/20 < 14 < 17 < 32 < 14 < 37 < 19 < 27 < 26 < 18 < 15 < 78 < 22 C') Red Cabbage 09/03/20 < 30 < 24 < 60 < 27 < 55 < 29 < 48 < 50 < 28 < 30 < 113 < 45 I

N 0 MEAN BO-QUAD 3 Red Beet Leaves 07/30/20 < 36 < 35 < 81 < 39 < 77 < 38 < 62 < 58 < 42 < 38 < 168 < 49 Red Beets 07/30/20 < 35 < 36 < 64 < 50 < 87 < 40 < 71 < 42 < 35 < 43 < 134 < 50 Cabbage Leaves 07/30/20 < 28 < 26 < 58 < 33 < 39 < 27 < 50 < 35 < 19 < 23 < 102 < 23 Cabbage Leaves 09/03/20 < 40 < 32 < 81 < 38 < 78 < 35 < 65 < 54 < 43 < 35 < 181 < 53 MEAN BO-QUAD 4 Red Beet Leaves 07/30/20 < 68 < 64 < 136 < 72 < 145 < 69 < 113 < 121 < 74 < 69 < 298 < 99 Beets 07/30/20 < 30 < 33 < 64 < 35 < 70 < 33 < 60 < 51 < 32 < 35 < 166 < 52 Kohlrabi 07/30/20 < 28 < 24 < 50 < 41 < 70 < 30 < 58 < 50 < 29 < 35 < 158 < 42 Kohlrabi 09/03/20 < 24 < 29 < 61 < 31 < 51 < 32 < 51 < 46 < 33 < 32 < 131 < 44 Red Beets 09/03/20 < 31 < 31 < 70 < 31 < 66 < 34 < 57 < 57 < 37 < 32 < 153 < 45 MEAN BOLD = Detection Lim! 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, 2020 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 07116120 < 31 < 30 < 66 < 31 < 66 < 36 < 49 < 52 < 39 < 35 < 147 < 36 Kale 07130120 < 34 < 29 < 58 < 34 < 63 < 32 < 55 < 49 < 33 < 32 < 133 < 28 Cabbage 07130120 < 21 < 24 < 41 < 28 < 43 < 25 < 38 < 34 < 23 < 27 < 104 < 24 Kale 08113120 < 18 < 19 < 35 < 21 < 42 < 20 < 37 < 26 < 22 < 22 < 77 < 23 Cabbage 08113120 < 29 < 28 < 67 < 33 < 63 < 31 < 51 < 37 < 30 < 31 < 155 < 16 Swiss Chard 08113120 < 35 < 30 < 68 < 38 < 78 < 41 < 66 < 39 < 38 < 38 < 153 < 46 Kohlrabi 08113/20 < 34 < 33 < 65 < 40 < 65 < 40 < 54 < 47 < 39 < 35 < 141 < 39 Cabbage 08/27/20 < 32 < 34 < 58 < 26 < 85 < 32 < 44 < 44 < 40 < 37 < 158 < 56 Kale 08/27/20 < 39 < 32 < 62 < 29 < 52 < 36 < 53 < 56 < 46 < 44 < 198 < 37 Kohlrabi 08/27/20 < 31 < 34 < 64 < 38 < 73 < 35 < 54 < 52 < 39 < 34 < 156 < 30 Kale 09/10/20 < 28 < 29 < 56 < 33 < 77 < 30 < 52 < 51 < 36 < 39 < 148 < 32 Cabbage 09110120 < 18 < 20 < 38 < 15 < 45 < 26 < 31 < 30 < 23 < 24 < 98 < 26 Kohlrabi 09110120 < 30 < 35 < 63 < 30 < 78 < 33 < 50 < 34 < 32 < 36 < 139 < 60 Kale 09/24/20 < 31 < 34 < 61 < 28 < 78 < 40 < 57 < 44 < 38 < 32 < 116 < 58

()

I Cabbage 09/24/20 < 23 < 19 < 33 < 23 < 45 < 23 < 40 < 29 < 26 < 25 < 76 < 28 I\)

~ Kohlrabi 09/24/20 < 30 < 27 < 69 < 29 < 79 < 28 < 67 < 41 < 29 < 28 < 112 < 36 Chard 09/24/20 < 42 < 41 < 82 < 41 < 67 < 38 < 61 < 60 < 44 < 38 < 169 < 45 Kale 10/08/20 < 23 < 22 < 31 < 16 < 44 < 20 < 33 < 29 < 24 < 22 < 102 < 18 Kohlrabi 10/08/20 < 23 < 22 < 50 < 29 < 56 < 27 < 40 < 32 < 29 < 29 < 92 < 32 Cabbage 10/08/20 < 19 < 20 < 42 < 21 < 42 < 25 < 28 < 36 < 22 < 25 < 96 < 21 Kale 10/22/20 < 30 < 27 < 49 < 34 < 52 < 29 < 59 < 34 < 34 < 29 < 117 < 2 Cabbage 10122/20 < 21 < 20 < 45 < 18 < 48 < 28 < 34 < 32 < 24 < 21 < 93 < 30 MEAN BWD-G2 Kale 08/13/20 < 37 < 39 < 72 < 40 < 88 < 42 < 79 < 51 < 38 < 46 < 151 < 39 Cabbage 08/13/20 < 30 < 35 < 53 < 24 < 50 < 29 < 49 < 40 < 35 < 33 < 114 < 31 Kale 08/27/20 < 36 < 31 < 81 < 48 < 93 < 36 < 67 < 54 < 43 < 46 < 176 < 46 Cabbage 08/27/20 < 37 < 33 < 67 < 33 < 64 < 29 < 56 < 56 < 31 < 44 < 133 < 39 Kohlrabi 09/10/20 < 32 < 35 < 57 < 38 < 62 < 44 < 61 < 54 < 41 < 40 < 167 < 51 Kale 09/10/20 < 39 < 42 < 72 < 35 < 96 < 40 < 70 < 55 < 40 < 53 < 169 < 57 Cabbage 09/10/20 < 20 < 19 < 37 < 18 < 46 < 18 < 28 < 28 < 19 < 19 < 75 < 26 Kale 09124/20 < 35 < 43 < 82 < 45 < 67 < 46 < 78 < 53 < 33 < 42 < 173 < 45 Cabbage 09/24/20 < 21 < 27 < 62 < 29 < 68 < 21 < 36 < 41 < 37 < 31 < 134 < 37 Kale 10/08120 < 27 < 27 < 30 < 24 < 53 < 28 < 36 < 39 < 34 < 31 < 123 < 35 Cabbage 10/08/20 < 26 < 23 < 57 < 27 < 38 < 24 < 45 < 30 < 27 < 24 < 111 < 18 Kale 10/22/20 < 38 < 36 < 68 < 36 < 87 < 33 < 60 < 43 < 32 < 37 < 164 < 52 Cabbage 10/22/20 < 20 < 21 < 41 < 21 < 46 < 26 < 40 < 27 < 23 < 25 < 84 < 19 MEAN

Table C-X.1 QUARTERLY OSLO RES ULTS FOR BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS Location BQ + 2019 Normalized Net Dose, Quarterly Facility Dose, FQ Annual BA+ Normalized Annual Monitoring Quarterly 2020 Location Baseline, BQ MDDQ (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 9.60 16.86 13.8 22.3 8.7 11.2 ND 12.7 ND ND 38.60 60.38 55.97 ND Ind - Far BD-02 9.40 16.66 13.2 20.5 7.2 10.4 ND 11 .1 ND ND 37.40 59.18 51.25 ND BD-04 8.50 15.76 11 .9 20.1 5.9 (1) ND 11 .6 ND NA 34.10 55.88 37.94 ND BD-05 9.60 16.86 15.7 21 .9 7.6 10.5 ND 12.3 ND ND 38.30 60.08 55.65 ND Ind - Inner BD-101 9.10 16.36 14.2 21 .3 5.8 9.4 ND 12.2 ND ND 36.60 58.38 50.73 ND BD-102 9.00 16.26 12.2 18.3 5.2 8.2 ND 9.3 ND ND 36.10 57.88 43.93 ND BD-103 9.00 16.26 12.9 22.2 7.1 9.4 ND 13.2 ND ND 35.90 57.68 51 .55 ND BD-104 8.00 15.26 11.8 19.6 5.6 8.3 ND 11 .6 ND ND 32.00 53.78 45.33 ND BD-105 8.30 15.56 12.4 19.5 6.0 8.4 ND 11 .2 ND ND 33.10 54.88 46.34 ND BD-106 7.90 15.16 12.2 19.6 4.9 8.9 ND 11 .7 ND ND 31 .70 53.48 45.62 ND BD-107 8.20 15.46 13.4 20.1 6.5 9.2 ND 11 .9 ND ND 32.60 54.38 49.24 ND BD-108 8.70 15.96 12.4 20.5 5.7 8.6 ND 11 .8 ND ND 34.90 56.68 47.23 ND BD-109 11.80 19.06 16.5 24.4 9.4 12.7 ND 12.6 ND ND 47.10 68.88 62.97 ND BD-110 7.90 15.16 11.2 19.9 7.2 7.6 ND 12 ND ND 31.70 53.48 45.85 ND BD-111a 8.60 15.86 12.5 18.3 6.0 9.0 ND 9.7 ND ND 34.40 56.18 45.84 ND BD-112 7.90 15.16 12.3 17.3 5.9 8.2 ND 9.4 ND ND 31 .80 53.58 43.74 ND BD-113a 9.10 16.36 13.4 20.3 5.2 8.6 ND 11 .2 ND ND 36.50 58.28 47.53 ND BD-114 8.80 16.06 14.0 19.9 6.3 11 .7 ND 11.1 ND ND 35.30 57.08 51.94 ND BD-115 8.90 16.16 14.4 21 .7 4.9 7.5 ND 12.8 ND ND 35.70 57.48 48.52 ND 0I BD-116 9.60 16.86 13.2 23.0 8.0 11.0 ND 13.4 ND ND 38.20 59.98 55.16 ND N

N Ind - Outer BD-201 12.20 19.46 16.2 27.4 11 .6 12.9 ND 15.2 ND ND 44.00 65.78 68.10 24.1 BD-202 9.10 16.36 13.7 20.5 7.7 9.5 ND 11 .4 ND ND 36.30 58.08 51.35 ND BD-203 8.80 16.06 14.2 20.7 7.0 11 .2 ND 11.9 ND ND 35.10 56.88 53.05 ND BD-204 7.90 15.16 12.4 18.3 5.2 8.2 ND 10.4 ND ND 31 .60 53.38 44.13 ND BD-205 8.20 15.46 12.7 19.9 5.1 10.4 ND 11.7 ND ND 32.90 54.68 48.13 ND BD-206 8.80 16.06 13.5 20.1 6.0 9.1 ND 11 .3 ND ND 35.40 57.18 48.74 ND BD-207 7.80 15.06 11.9 19.8 4.8 8.2 ND 12 ND ND 31 .10 52.88 44.72 ND BD-208 8.70 15.96 14.7 20.6 6.6 9.8 ND 11 .9 ND ND 34.90 56.68 51.74 ND BD-209 13.20 20.46 16.5 24.2 9.8 12.9 ND 11 ND ND 52.90 74.68 63.38 ND BD-210 10.70 17.96 16.0 24.8 10.0 11 .7 ND 14.1 ND ND 42.60 64.38 62.48 ND BD-211 13.20 20.46 18.3 25.7 9.0 14.7 ND 12.5 ND ND 52.70 74.48 67.67 ND BD-212 11 .30 18.56 13.1 21 .3 4.9 8.5 ND 10 ND ND 45.10 66.88 47.82 ND BD-213 7.70 14.96 12.7 20.0 5.0 7.6 ND 12.3 ND ND 31 .00 52.78 45.33 ND BD-214 10.10 17.36 16.0 23.7 7.8 11 .2 ND 13.6 ND ND 40.40 62.18 58.66 ND BD-215 8.40 15.66 13.5 20.9 5.3 9.9 ND 12.5 ND ND 33.50 55.28 49.63 ND BD-216 10.80 18.06 15.3 22.2 8.9 11.3 ND 11 .4 ND ND 43.10 64.88 57.67 ND Ind- Near BD-06 8.50 15.76 13.1 20.8 6.3 9.4 ND 12.3 ND ND 33.80 55.58 49.64 ND BD-19 9.80 17.06 15.7 23.3 7.9 9.0 ND 13.5 ND ND 39.20 60.98 55.86 ND BD-20 9.50 16.76 13.8 21 .9 7.2 9.8 ND 12.4 ND ND 37.90 59.68 52.65 ND BD-21 8.90 16.16 13.8 20.9 7.0 8.9 ND 12 ND ND 35.60 57.38 50.55 ND Other (ISFSI) BD-ISFSl-104-3 12.80 20.06 17.5 25.1 10.5 12.6 ND 12.3 ND ND 51.10 72.88 65.69 ND BD-ISFSl-104-4 12.80 20.06 18.2 26 11.0 15.6 ND 13.2 ND ND 51 .4 73.2 70.8 ND BD-ISFSl-105-3 13.20 20.46 15.4 28.4 12.6 16.8 ND 15.2 ND ND 52.8 74.6 73.2 ND BD-ISFSl-105-4 17.10 24.36 33.4 38.2 29.4 30.0 16.3 21 .1 12.3 12.9 68.4 90.2 131.0 62.6 BD-ISFSl-110-3 11.40 18.66 17.4 25.2 11.8 14.5 ND 13.8 ND ND 45 .8 67.6 68.9 23.1 BD-ISFSl-110-4 13.20 20.46 23.4 28.6 16.0 22.0 10.2 15.4 ND 8.8 52.8 74.6 90.0 37.2 (1) SEE PROGRAM EXCEPTIONS SECTIONS FOR EXPLANATION ND= Non-Detect

TABLE C-X.2 MEAN QUARTLY OSLD RESULTS FOR THE INNER RING, OUTER RING, OTHER, CONTROL, AND INDEPENDENT SPENT FUEL STORAGE INSTALLATION (ISFSI) LOCATIONS FOR BRAIDWOOD STATION, 2020 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 13.1 +/- 2.5 14.4 +/- 3.6 13.9 +/- 2.8 13.8 +/- 0.0 20.9 +/- 13.4 APR-JUN 20.4 +/- 3.6 21 .9 +/- 5.1 21 .3 +/- 2.2 22.3 +/- 0.0 28.6 +/- 9.9 JUL-SEP 6.2 +/- 2.4 7.2 +/- 4.3 7.0 +/- 1.3 8.7 +/- 0.0 15.2 +/- 14.4 OCT-DEC 9.2 +/- 2.9 10.4 +/- 4.0 9.7 +/- 1.4 11.2 +/- 0.0 18.6 +/- 12.9 TABLE C-X.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM +/-2 S.D.

SITE BOUNDARY 64 4.9 24.4 12.2 +/- 11 .0 0I INTERMEDIATE DISTANCE 64 4.8 27.4 13.5 +/- 11.8 N OTHER 27 5.9 23.3 13.1 +/- 11 .3 c,)

CONTROL 4 8.7 22.3 14.0 +/- 11 .8 ISFSI 24 10.5 38.2 20.8 +/- 15.6 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 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 - 2020 BD-10 Kankaee River, Downstream 10.0 8.0 6.0 0C.

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

01-01-00 04-02-05 07-03-10 10-03-15 01-02-21 BD-25 (C) Kankakee River, Upstream 16.0 14.0 12.0 10.0

..J r,C. 8.0 6.0 4.0 2.0 0.0 - - - - - - - - - - - - - + - - - - - - - - - - - - I 01-01-00 04-02-05 07-03-10 10-03-15 01-02-21 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-24

FIGURE C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2020 BD-38 Main Drainage Ditch 14.0 12.0 10.0

.J 8.0

~

C.

6.0 4.0 2.0 0.0 01-25-07 07-20-10 01-12-14 07-07-17 12-30-20 BD-40 Braidwood Station Cooling Lake 16.0 14.0 12.0 10.0

! 8.0 0C.

6.0 4.0 2.0 0.0 + - - - - - - - + - - - - - - + - - - - - - + - - - - - - - - i 10-05-06 04-27-10 11-17-13 06-09-17 12-30-20 C-25

FIGURE C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2020 BD-55 North Pond Fatlan Site 14.0 12.0 10.0

..J 8.0 i3C.

6.0 4.0 2.0 0.0 01-25-07 07-20-10 01-12-14 07-07-17 12-30-20 BD-56 South Pond Fatlan Site 10.0 8.0 6.0 4.0 2.0 0.0 +----------t---------t-------------

01-25-07 07-20-10 01 14 07-07-17 12-30-20 GAPS IN DATA ARE DUE TO SAMPLING POINTS BEING FROZEN AT TIME OF COLLECTION C-26

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

Collected in the Vicinity of Braidwood Station, 2000 - 2020 80-10 Kankakee River, Downstream 3000 2500 2000 1500 1000 500 0 +--"'--.::...,,O,'--Q~:a.....+------+------+---------1 03-25-00 06-02-05 08-10-10 10-18-15 12-25-20 80-25 (C) Kankakee River, Upstream 400 300 5

u 200 C.

100 0-t-----------1,-----------------------1 03-25-00 06-02-05 08-10-10 10-18-15 12-25-20 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-27

FIGURE C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2020 BD-38 Main Drainage Ditch 2400 2100 1800 1500 0Q. 1200 900 600 300 0

03-09-06 11-19-09 08-01 -13 04-13-17 12-24-20 BD-40 Braidwood Station Cooling Lake 400 300

.J 200

~Q.

100 0+-------------------1-------1 07-20-06 02-27-10 10-07-13 05-17-17 12-25-20 C-28

FIGURE C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2020 BD-55 North Pond Fatlan Site 250 200 150

.J

~C.

100 50 0------------------t----------1 03-29-07 09-04-10 02-10-14 07-19-17 12-25-20 BD-56 South Pond Fatlan Site 250 200 150

.J

~C.

100 50 0+--------+-----------------

03-29-07 09-04-10 02-10-14 07-19-17 12-25-20 C-29

FIGURE C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-22 Wilmington 10.0 8.0 6.0

...J

~C.

4.0 2.0 0.0 - - - - - - - - - - - - - - - - - - - - - - - - -

01-29-00 04-23-05 07-17-10 10-10-15 01-02-21 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-30

FIGURE C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-22 Wilmington 8000 7200 6400 5600 4800

..J 4000

~a.

3200 2400 1600 800 0

01-29-00 04-23-05 07-17-10 10-10-15 01-02-21 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-31

FIGURE C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-13 Braidwood City Hall Well 500 400 300 200 100 0 ----------+--------------,1-------1 01-07-00 03-19-04 05-30-08 08-10-12 10-21-16 01-01-21 BD-34 Gibson Well 700 600 500 400 0C.

300 200 100 0

01 00 03-19-04 05-30-08 08-10-12 10-21-16 01-01-21 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-32

FIGURE C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-35 Joly Well 500 400 300 su C2.

200

\

100 0+-->"------+--o-----+-------+-----+------

01-07-00 03-19-04 05-30-08 08-10-12 10-21-16 01-01-21 BD-36 Hutton Well 1200 1000 800

...J 600 i3C2.

400 200 0---------------+-----+--------1 01-07-00 03-19-04 05-30-08 08-10-12 10-21-16 01-01-21 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-33

FIGURE C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-37 Nurczyk Well 600 500 400 uc. 300 200 100 o "'---~~~-------+-----1------------1 01-07-00 03-19-04 05-30-08 08-10-12 10-21-16 01-01-21 DUE TD VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-34

FIGURE C-12 Ground/Well Water - Tritium - Station BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2020 BD-50 Skole Well 1000 900 800 700

• 600 0Q. 500 400 300 200 100 0

01-01-07 07-02-10 12-31-13 07-01-17 12-30-20 STATION BD-50 WAS INITIALLY DISCONTINUED ON 10118107 AND RESUMED ON 04108110 BD-51 Fatlan Well 600 500 400

..J

~Q. 300 200 100 0

01-03-07 07-03-10 12-31-13 06-30-17 12-28-20 C-35

FIGURE C-13 Ground/Well Water - Tritium - Station BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2020 BD-54 Cash Well 600 500 400

...J i3 Q. 300 200 100 0

01-03-07 07-03-10 12-31-13 06-30-17 12-28-20 C-36

FIGURE C-14 Air Particulate - Gross Beta- Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2020 80-03 (C} County Line Road 80.0 60.0

.E 0

..,0CL 40.0

...111 0

20.0 0.0 - - - - 06-05 01-07-00

- - - - - 05-10

- - - - - 03-15

---

1 12-31-20 80-06 Godley 60.0 50.0

.., 40.0

.E uC.

M 30.0

~

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

01-07-00 04-06-05 07-05-10 10-03-15 12-31-20 C-37

FIGURE C-15 Air Particulate - Gross Beta- Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-19 Near Field, NW 60.0 50.0 M 40.0

-E 0

Cl.

M 30.0 0

111 0

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

01-07-00 04-06-05 07-05-10 10-03-15 12-31 -20 BD-20 Near Field, N 70.0 60.0 50.0 M

-E 40.0 0Cl.

M 9 30.0

...w 0

20.0 10.0 0.0 -----------------------t 01-07-00 04-06-05 07-05-10 10-03-15 12-31-20 C-38

FIGURE C-16 Air Particulate - Gross Beta- Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2020 BD-21 Near Field, NE 70.0 60.0 50.0

-E u 40.0 0.

9

...w C

30.0 20.0 10.0 0.0 +--- - - - + - - - - - - + -- - - - - + - - - -- --,

01-07-00 04-06-05 07-05-10 10-03-15 12-31-20 C-39

FIGURE C-17 Air Particulate - Gross Beta- Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2020 BD-02 Near Field, NW 60.0 50.0 M 40.0 E

~C.

9 30.0 w

0 20.0 10.0 0.0 +---- - - - + - - - - - - t - - - - - - + - - - - - - - - 1 07-07-05 05-21 -09 04-04-13 02-16-17 12-31-20 BD-04 Near Field, N 60.0 50.0 40.0 M

-E

~ 30.0 M

0 ui 0

20.0 10.0 0.0 - -- - -- - - - - - - - - - - - - - - - - -

07-07-05 05-21-09 04-04-13 02-16-17 12-31-20 C-40

FIGURE C-18 Air Particulate - Gross Beta- Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2020 BD-05 Near Field, NE 60.0 50.0 40.0 E

~

..,a. 30.0

'i' w

0 "t- 20.0 10.0 0.0 + - - - - - - t - - -- ---+-----1-------1 07-07-05 05-21-09 04-04-13 02-16-17 12-31-20 C-41

Intentionally left blank APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units TBE Value Evaluation (bl Number Value (a) Known Result September 2020 E13247 Milk Sr-89 pCi/L 62.8 95.4 0.66 N(1l Sr-90 pCi/L 12.0 12.8 0.94 A E13248 Milk Ce-141 pCi/L 156 150 1.04 A Co-58 pCi/L 172 180 0.96 A Co-60 pCi/L 369 379 0.97 A Cr-51 pCi/L 372 372 1.00 A Cs-134 pCi/L 171 200 0.85 A Cs-137 pCi/L 241 250 0.96 A Fe-59 pCi/L 217 200 1.08 A 1-131 pCi/L 84.6 95.0 0.89 A Mn-54 pCi/L 175 180 0.97 A Zn-65 pCi/L 252 270 0.93 A E13249 Charcoal 1-131 pCi 70.2 75.8 0.93 A E13250 AP Ce-141 pCi 101 101 1.00 A Co-58 pCi 111 120 0.92 A Co-60 pCi 249 254 0.98 A Cr-51 pCi 287 249 1.15 A Cs-134 pCi 114 134 0.85 A Cs-137 pCi 159 168 0.95 A Fe-59 pCi 127 134 0.95 A Mn-54 pCi 114 121 0.94 A Zn-65 pCi 168 181 0.93 A E13251 Soil Ce-141 pCi/g 0.241 0.191 1.26 w Co-58 pCi/g 0.211 0.228 0.93 A Co-60 pCi/g 0.466 0.481 0.97 A Cr-51 pCi/g 0.450 0.472 0.95 A Cs-134 pCi/g 0.273 0.254 1.07 A Cs-137 pCi/g 0.370 0.390 0.95 A Fe-59 pCi/g 0.233 0.254 0.92 A Mn-54 pCi/g 0.217 0.229 0.95 A Zn-65 pCi/g 0.368 0.343 1.07 A E13252 AP Sr-89 pCi 79.9 100.0 0.80 A Sr-90 pCi 12.1 13.4 0.90 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of0.80-1 .20 W = Acceptable with warning - reported result falls within 0. 70-0. 80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0.70 and> 1.30 (1) See NCR 20-19 (Page 1 of 2)

D-1

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

Number Value (a) Known Result December 2020 E13254 Milk Sr-89 pCi/L 82 .2 89.7 0.92 A Sr-90 pCi/L 12.4 13.0 0.96 A E13255 Milk Ce-141 pCi/L 91.1 100 0.91 A Co-58 pCi/L 77.5 84.3 0.92 A Co-60 pCi/L 147 152 0.97 A Cr-51 pCi/L 259 253 1.02 A Cs-134 pCi/L 97.1 108 0.90 A Cs-137 pCi/L 117 127 0.92 A Fe-59 pCi/L 114 112 1.02 A 1-131 pCi/L 84 .3 91 .9 0.92 A Mn-54 pCi/L 137 143 0.96 A Zn-65 pCi/L 175 190 0.92 A E13256 Charcoal 1-131 pCi 70.2 78.2 0.90 A E13257A AP Ce-141 pCi 67.4 74.6 0.90 A Co-58 pCi 57.9 62.9 0.92 A Co-60 pCi 108 113 0.95 A Cr-51 pCi 162 189 0.86 A Cs-134 pCi 68.1 80.4 0.85 A Cs-137 pCi 82.4 95.0 0.87 A Fe-59 pCi 80.5 83.7 0.96 A Mn-54 pCi 102 107 0.95 A Zn-65 pCi 115 142 0.81 A E13258 Soil Ce-141 pCi/g 0.167 0.170 0.98 A Co-58 pCi/g 0.125 0.143 0.87 A Co-60 pCi/g 0.245 0.257 0.95 A Cr-51 pCi/g 0.393 0.429 0.92 A Cs-134 pCi/g 0.147 0.183 0.80 A Cs-137 pCi/g 0.260 0.288 0.90 A Fe-59 pCi/g 0.199 0.190 1.05 A Mn-54 pCi/g 0.229 0.243 0.94 A Zn-65 pCi/g 0.320 0.322 0.99 A E13259 AP Sr-89 pCi 85.0 78.6 1.08 A Sr-90 pCi 13.1 11.4 1.15 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TB£ internal QC limits:

A= Acceptable - reported result falls within ratio limits of0.80-1.20 W = Acceptable with warning- reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (Page 2 of 2) 0-2

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Month/Year Matrix Nuclide Units Evaluation (bl Number Value Value (a) Range February 2020 20-GrF42 AP Gross Alpha Sq/sample 0.676 1.24 0.37 - 2.1 1 A Gross Beta Sq/sample 2.03 2.00 1.00 - 3.00 A 20-MaS42 Soil Ni-63 Bq/kg 0.01 (1) A Sr-90 Bq/kg 348 340 238 - 442 A 20-MaW42 Water Ni-63 Bq/L 11 .6 11.1 7.8 - 14.4 A Pu-238 Bq/L 0.926 0.94 0.66 - 1.22 A Pu-239/240 Bq/L 0.712 0.737 0.516 - 0.958 A 20-RdF42 AP U-234/233 Sq/sample 0.0416 0.075 0.053 - 0.098 N!Jl U-238 Sq/sample 0.0388 0.078 0.055 - 0.101 N!Jl 20-RdV42 Vegetation Cs-134 Sq/sample 3.23 3.82 2.67 - 4.97 A Cs-137 Sq/sample 2.64 2.77 1.94 - 3.60 A Co-57 Sq/sample 0.0281 (1) A Co-60 Sq/sample 2.62 2.79 1.95-3.63 A Mn-54 Sq/sample 4 .3 4.58 3.21 - 5.95 A Sr-90 Sq/sample 0.396 0.492 0.344 - 0.640 A Zn-65 Sq/sample 3.93 3.79 2.65- 4.93 A August2020 20-GrF43 AP Gross Alpha Sq/sample 0.267 0.528 0.158- 0.989 A Gross Beta Sq/sample 0.939 0.915 0.458 - 1.373 A 20-MaS43 Soil Ni-63 Bq/kg 438 980 686 - 1274 Nt4l Tc-99 Bq/kg 1.11 (1) A 20-MaW43 Water Ni-63 Bq/L 0.175 (1) A Tc-99 Bq/L 8.8 9.4 6.6 - 12.2 A 20-RdV43 Vegetation Cs-134 Sq/sample 3.635 4.94 3.46 - 6.42 w Cs-137 Sq/sample 0.0341 (1) A Co-57 Sq/sample 5.855 6.67 4.67 - 8.67 w Co-60 Sq/sample 3.122 4.13 2.89- 5.37 w Mn-54 Sq/sample 4.524 5.84 4.09- 7.59 A Sr-90 Sq/sample 1.01 1.39 0.97 - 1.81 w Zn-65 Sq/sample 4.706 6.38 4.47 - 8.29 w (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) 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) See NCR 20-13 (4) See NCR 20-20 (Page 1 of 1)

D-3

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services Identification Known Acceptance Month/Year Matrix Nuclide Units TBEValue Evaluation (bl Number Value (a> Limits March 2020 MRAD-32 Water Am-241 pCi/L 52.5 45.3 31.1-57.9 A Fe-55 pCi/L 155 152 89.3- 221 A Pu-238 pCi/L 34.0 36.4 21.9-47.2 A Pu-239 pCi/L 30.9 33.6 20.8-41.4 A April 2020 RAD-121 Water Ba-133 pCi/L 41 .8 41 .8 34.0-46.7 A Cs-134 pCi/L 42.9 46 .3 37.1 - 50.9 A Cs-137 pCi/L 226 234 211 - 259 A Co-60 pCi/L 52.4 50.3 45.3 - 57.9 A Zn-65 pCi/L 83.3 86 .8 78.1 -104 A GR-A pCi/L 20.1 23.6 11.9-31.6 A GR-8 pCi/L 45.6 60.5 41.7-67.2 A U-Nat pCi/L 18.45 18.6 14.9 - 20.9 A H-3 pCi/L 14200 14100 12300 - 15500 A Sr-89 pCi/L 58.0 60.1 48.3- 67.9 A Sr-90 pCi/L 34.1 44 .7 33.0- 51.2 A 1-131 pCi/L 27.4 28 .9 24.1 - 33.8 A September 2020 MRAD-33 Soil Sr-90 pCi/Kg 4360 4980 1550 - 7760 A AP Fe-55 pCi/Filter 189 407 149 - 649 A U-234 pCi/Filter 17.9 18.3 13.6-21.4 A U-238 pCi/Filter 19.1 18.1 13.7-21.6 A Water Am-241 pCi/L 160 176 121 - 225 A Fe-55 pCi/L 299 298 175 -433 A Pu-238 pCi/L 200 191 115-247 A Pu-239 pCi/L 105 100 61 .9- 123 A October 2020 RAD-123 Water Ba-133 pCi/L 37.1 37.0 29.8-41 .6 A Cs-134 pCi/L 50.6 52.7 42 .5 - 58.0 A Cs-137 pCi/L 131 131 118-146 A Co-60 pCi/L 62.9 60 .5 54.4 - 69.1 A Zn-65 pCi/L 167 162 146 - 191 A GR-A pCi/L 40.0 26.2 13.3 - 34.7 N(1l GR-B pCi/L 47.5 69.1 48 .0 - 76 .0 N(1>

U-Nat pCi/L 17.2 20.3 16.3 - 22 .7 A H-3 pCi/L 23800 23200 20,300 - 25,500 A Sr-89 pCi/L 41.1 43.3 33.4 - 50.5 A Sr-90 pCi/L 28.5 30.2 22.0 - 35.0 A 1-131 pCi/L 22.9 28.2 23.5 - 33.1 N(2)

November 2020 QR111920K Water GR-A pCi/L 50.7 52.4 27.3- 65.6 A GR-B pCi/L 24.9 24.3 15.0- 32.3 A (a) The ERA known value is equal to 1003/4 of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 20-18 (2) See NCR 20-17 (Page 1 of 1)

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APPENDIX E ERRATA DATA

Intentionally left blank There was no errata data for 2020.

E-1

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 2020 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation ii Braidwood Station Braceville, IL 60407 May 2021

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ...................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2

8. Implementation of the Objectives ........................................................................ 2 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium (H-3) ............................................................................ 3 Ill. Program Description ....................................................................................................... 4 A. Sample Analysis .................................................................................................. 4

8. Data Interpretation ............................................................................................... 4 C. Background Analysis ......................................................................................... 5 IV. Results and Discussion ................................................................................................. 7 A. Missed Samples .................................................................................................. 7

8. 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, 2020 Figures Figure A-1 RGPP Protected Area Monitoring Well Sample Locations Braidwood Station, 2020 Figure A-2 RGPP Surface Water Sample Locations Braidwood Station, 2020 Figure A-3 RGPP VB VB-4 Area Monitoring Well Sample Locations Braidwood Station, 2020 Figure A-4 RGPP Slowdown Line Monitoring Well Sample Locations Braidwood Station, 2020 Figure A-5 RGPP CWBD Monitoring Well Sample Locations Braidwood Station, 2020 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, 2020 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2020 Table B-1.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2020 Table B-I1.1 Concentrations of Tritium, Strontium and Gross Alpha in Surface Water Samples Collected in the Vicinity of Braidwood Station , 2020 Table B-I1.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2020 ii

I. Summary and Conclusions In 2020, 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 2020. During that time period, 324 analyses were performed on 135 samples from 35 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 and surface water at concentrations greater than the LLD of 200 pCi/L in 46 of 127 samples. The tritium concentrations ranged from 179 +/- 116 pCi/L to 1,000 +/- 167 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 groundwater water samples throughout the sampling year in 2020. Gross Alpha (suspended) was detected in 1 groundwater sample with a concentration of 3.8 to 1.7 pCi/L. Gross Alpha (suspended) was not detected in any groundwater samples.

Gross Alpha analyses in the dissolved and suspended fractions were performed on surface water samples quarterly in 2020. No Gross Alpha (dissolved and suspended) was detected in surface water samples.

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 location in 2020. U-233/234 was detected in 2 samples with concentrations ranging from 0.77 +/- 0.34 pCi/L to 1.20 +/- 0.38 pCi/L.

U-238 was detected in 2 samples with concentrations ranging from 0.49 +/- 0.27 pCi/L to 0.34 +/- 0.22 pCi/L No other HTD's were detected above the detection limit.

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 2020.

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 2020.

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

1. Concentrations of gamma emitters in groundwater and surface water

2. Concentrations of strontium in groundwater 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 2020. 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 USE PA, 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 no missed samples during 2020.

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 1,000 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 groundwater water samples throughout the sampling year in 2020. Gross Alpha (suspended) was detected in 1 groundwater sample at a concentration of 3.8 +/- 1.0 pCi/L. Gross Alpha (dissolved) was not detected in any groundwater samples. (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 analyzed at one location in 2020.

U-233/234 was detected in 2 samples with concentrations ranging from 0.77 +/- 0.34 pCi/L to 1.20 +/- 0.38 pCi/L. U-238 was detected in 2 samples with concentrations ranging from 0.49 +/- 0.27 pCi/L to 0.34 +/- 0.22 pCi/L No other HTD's were detected above the detection limit.

(Table B-1.3, Appendix B)

Gamma Emitters Naturally-occurring K-40 was detected in two samples with concentrations of 42 +/- 28 pCi/L and 72 +/- 33 pCi/L. No other gamma-emitting nuclides were detected in any of the samples analyzed. (Table B-1.2, Appendix B)

C. Surface Water Results Samples were collected from two surface water locations 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 were all less than the lower limit of detection. (Table B-I1.1, Appendix B)

Strontium Sr-89 and Sr-90 were analyzed in two samples. 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-I1.1, Appendix B)

Gross Alpha (dissolved and suspended)

Two surface water samples were analyzed for Gross Alpha in the dissolved and suspended fractions. No Gross Alpha (dissolved and suspended) was detected in any of the samples analyzed. (Table B-I1.1, Appendix B)

Gamma Emitters Two surface water samples were analyzed for gamma emitters. No gamma emitting nuclides were detected in any of the samples analyzed. (Table B-I1.2, 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 2020.

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 2020.

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 8-1.1 in this report.

3. Actions to Recover/Reverse Plumes Remediation efforts for the CWBD House area 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 groundwater remediation efforts to remove the tritium contamination from the area.

4. All remediation and support equipment were removed from Exelon Braidwood Station property 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, 2020 Station Code Sami;ile Descrii;ition 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 VBB-2R Monitoring Well VB9-1 Monitoring Well V810-1R Monitoring Well VB11-1 Monitoring Well A-1

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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, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-2 03/20/20 336 +/- 126 MW-2 04/17/20 203 +/- 119 MW-2 09/21/20 204 +/- 122 < 9.4 < 0.9 < 0.8 < 0.4 MW-2 11/30/20 209 +/- 125 MW-4 03/23/20 388 +/- 133 MW-4 04/16/20 403 +/- 125 MW-4 08/26/20 381 +/- 128 < 6.6 < 0.9 < 1.7 < 1.1 MW-4 11/09/20 342 +/- 124 MW-5 03/17/20 277 +/- 123 MW-5 04/17/20 < 181 MW-5 08/25/20 196 +/- 116 < 6.5 < 0.8 < 0.6 < 0.6 MW-5 11/09/20 215 +/- 121 MW-6 03/20/20 498 +/- 134 MW-6 04/18/20 < 183 MW-6 08/26/20 369 +/- 125 < 6.7 < 0.8 < 1.5 < 1.3 MW-6 12/10/20 506 +/- 137 MW-7 03/17/20 308 +/- 125 MW-7 04/16/20 518 +/- 132 MW-7 08/26/20 301 +/- 123 < 9.4 < 0.9 < 0.8 < 1.13 MW-7 11/30/20 325 +/- 132 MW-11 03/23/20 < 185 MW-11 04/17/20 < 177 MW-11 08/25/20 < 178 < 5.8 < 0.7 < 0.7 < 0.6 MW-11 10/27/20 239 +/- 130 MW-102R 03/24/20 < 186 MW-102R 04/22/20 < 188 MW-102R 08/27/20 < 177 < 6.6 < 0.7 < 0.4 < 1.1 MW-102R 12/02/20 < 190 MW-1410 03/20/20 374 +/- 125 MW-1410 04/18/20 435 +/- 129 MW-1410 09/21/20 407 +/- 131 < 5.1 < 1.0 < 7.4 < 7.0 MW-1410 12/10/20 471 +/- 134 < 6.9 < 0.7 MW-142D 03/20/20 789 +/- 153 MW-142D 04/18/20 803 +/- 153 MW-142D 08/26/20 1000 +/- 167 < 6.9 < 0.8 < 4.0 < 2.0 MW-1420 11/09/20 794 +/- 153 MW-143D 03/17/20 < 184 MW-143D 04/16/20 < 183 MW-143D 08/26/20 < 178 < 7.0 < 0.7 < 1.6 3.8 +/- 1.7 MW-143D 10/27/20 < 193 MW-144D 03/17/20 291 +/- 124 MW-144D 04/17/20 305 +/- 125 MW-144D 08/25/20 373 +/- 125 < 6.6 < 0.8 < 0.7 < 0.6 MW-144D 11/09/20 293 +/- 125 MW-145D 03/25/20 < 186 MW-145D 06/04/20 < 179 MW-145D 09/10/20 < 189 < 7.7 < 1.0 < 0.4 < 0.9 MW-145D 12/07/20 < 181 MW-154 02/18/20 < 166 MW-154 04/23/20 < 162 MW-154 09/16/20 < 179 < 4.6 < 0.9 < 0.3 < 1.0 B-1

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

MW-154 12/09/20 < 192 MW-155 02/18/20 < 182 MW-155 04/22/20 < 184 MW-155 09/16/20 < 181 < 5.0 < 0.7 < 0.4 < 1.0 MW-155 12/09/20 < 190 MW-159D 03/24/20 292 +/- 128 MW-159D 04/07/20 250 +/- 120 MW-159D 08/17/20 179 +/- 116 < 5.2 < 0.7 < 2.1 < 0.8 MW-159D 10/27/20 < 190 MW-162D 03/23/20 < 189 MW-162D 04/07/20 232 +/- 120 MW-162D 08/17/20 < 180 < 7.5 < 0.8 < 0.7 < 0.6 MW-162D 10/27/20 < 193 MW-BW-201S 03/24/20 227 +/- 127 MW-BW-201S 04/08/20 240 +/- 120 MW-BW-201S 08/25/20 190 +/- 117 < 5.9 < 0.9 < 0.8 < 0.6 MW-BW-201S 10/27/20 220 +/- 128 MW-BW-202S 03/23/20 < 189 MW-BW-202S 04/08/20 206 +/- 118 MW-BW-202S 08/17/20 321 +/- 120 < 6.5 < 0.9 < 2.0 < 0.8 MW-BW-202S 10/27/20 < 195 MW-BW-203S 03/24/20 < 188 MW-BW-203S 08/17/20 203 +/- 117 < 7.4 < 0.8 < 1.6 < 0.8 MW-BW-203S 10/27/20 < 198 MW-BW-207I 03/20/20 767 +/- 152 MW-BW-207I 04/18/20 656 +/- 141 MW-BW-207I 08/26/20 665 +/- 140 < 7.0 < 0.7 < 1.6 < 1.1 MW-BW-207I 11/30/20 617 +/- 146 OWM31P 09/21/20 < 182 PS-10 03/24/20 < 191 PS-10 04/23/20 < 166 PS-10 09/14/20 < 179 < 5.3 < 0.8 < 0.5 < 1.0 PS-10 12/02/20 < 169 PS-12 03/24/20 < 191 PS-12 04/23/20 < 160 PS-12 09/15/20 < 183 < 4.4 < 1.0 < 0.6 < 1.0 PS-12 12/02/20 < 170 RW-6 06/30/20 337 +/- 122 < 3.9 < 0.8 < 2.8 < 0.4 RW-6 08/27/20 257 +/- 122 RW-6 12/09/20 263 +/- 129 VB1-1 02/18/20 < 168 VB1-1 04/22/20 < 163 VB1-1 09/16/20 < 180 < 9.6 < 0.7 < 0.9 < 0.4 VB1-1 12/09/20 < 193 VB3-2 03/24/20 < 187 VB3-2 04/22/20 < 184 VB3-2 08/27/20 < 176 < 6.7 < 0.8 < 0.6 < 1.1 VB3-2 12/02/20 < 193 VB5-2 03/25/20 < 184 VB5-2 06/04/20 < 182 VB5-2 09/10/20 < 186 < 7.2 < 0.8 < 0.5 < 1.4 B-2

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

VB5-2 12/07/20 < 178 VB6-1 03/25/20 < 182 VB6-1 06/04/20 < 180 VB6-1 09/10/20 < 190 < 6.5 < 0.7 < 0.6 < 0.9 VB6-1 12/07/20 < 179 VB7-1 03/25/20 < 187 VB7-1 06/04/20 < 181 VB7-1 09/10/20 < 186 < 5.9 < 0.9 < 0.6 < 0.9 VB7-1 12/07/20 < 179 VB8-2R 03/25/20 < 185 VB8-2R 06/04/20 < 182 VB8-2R 09/10/20 < 184 < 7.3 < 0.8 < 0.7 < 0.9 VB8-2R 12/07/20 < 179 VB9-1 03/25/20 < 186 VB9-1 06/04/20 < 185 VB9-1 09/10/20 < 185 < 5.7 < 0.9 < 0.8 < 0.9 VB9-1 12/07/20 < 181 VB10-1R 03/25/20 < 185 VB10-1R 06/04/20 < 184 VB10-1R 09/10/20 < 186 < 7.2 < 0.8 < 0.7 < 0.9 VB10-1R 12/07/20 < 181 VB11-1 03/25/20 < 189 VB 11-1 06/04/20 < 180 VB11-1 09/10/20 < 188 < 5.8 < 0.7 < 0.8 < 0.9 VB11-1 12/07/20 < 179 B-3

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PC I/LITER +/- 2 SIGMA COLLECTION SITE DATE 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 La-140 MW-2 09/21/20 < 18 < 18 < 2 < 2 <4 <2 <4 <2 <4 < 5 < 2 < 2 < 13 <4 MW-4 08/26/20 < 15 < 32 < 1 < 2 <4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 14 <4 MW-5 08/25/20 < 22 < 27 < 2 < 3 < 5 < 3 < 5 < 3 <4 < 5 < 3 < 3 < 15 < 5 MW-6 08/26/20 < 15 < 14 < 1 < 2 <4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 15 < 5 MW-7 08/26/20 < 15 < 25 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 14 <5 MW-11 08/25/20 < 27 < 54 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 5 < 3 < 3 < 15 <4 MW-102R 08/27/20 < 16 < 28 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 7 < 2 < 2 < 15 <5 MW-1410 09/21/20 < 17 < 17 < 2 < 2 <4 < 2 <4 < 2 < 3 < 5 < 2 <2 < 12 <4 MW-142D 08/26/20 < 26 72 +/- 33 < 3 < 3 < 7 <3 < 6 <3 < 5 < 5 < 3 < 3 < 14 < 5 MW-143D 08/26/20 < 19 < 17 < 2 < 2 <4 < 2 <4 < 2 <4 <7 < 2 <2 < 15 < 5 MW-144D 08/25/20 < 22 < 26 < 3 < 3 < 6 <3 < 5 <3 < 5 < 5 <3 <3 < 15 < 4 MW-145D 09/10/20 < 15 < 30 < 2 < 2 <4 <2 <4 <2 < 3 < 3 < 2 < 2 < 9 < 3 MW-154 09/16/20 < 17 < 15 < 2 < 2 <4 < 2 <4 < 2 < 3 < 7 < 2 <2 < 14 < 5 MW-155 09/16/20 < 16 < 32 < 2 < 2 <4 <2 < 3 < 2 < 3 <7 < 2 < 2 < 14 < 5 CD I

.I). MW-159D 08/17/20 < 17 42 +/- 28 < 2 < 2 <4 <2 <4 < 2 < 3 <7 < 2 < 2 < 15 <5 MW-162D 08/17/20 < 19 < 17 < 2 < 2 < 5 <2 <4 < 2 <4 <8 < 2 < 2 < 15 <5 MW-BW-201S 08/25/20 < 27 < 28 < 3 < 3 <7 <3 < 6 < 3 <5 <7 <3 <3 < 15 <5 MW-BW-202S 08/17/20 < 19 < 18 < 2 < 2 < 5 < 2 <4 <2 < 3 <7 < 2 < 2 < 15 <5 MW-BW-203S 08/17/20 < 18 < 18 < 2 < 2 < 5 < 2 <4 <2 < 4 <7 < 2 <2 < 15 <4 MW-BW-207I 08/26/20 < 15 < 14 < 1 < 2 <4 < 2 < 3 < 2 < 3 <7 < 2 < 1 < 14 <4 PS-10 09/14/20 < 16 < 14 < 2 < 2 <4 < 2 < 3 < 2 < 3 <6 < 2 <2 < 14 <4 PS-12 09/15/20 < 15 < 29 < 2 < 2 <4 <2 < 3 < 2 < 3 <6 <2 < 2 < 13 < 4 RW-6 06/30/20 < 16 < 33 < 2 < 2 <4 <2 < 3 <2 < 3 <7 < 2 < 2 < 14 <5 VB1-1 09/16/20 < 15 < 25 < 2 < 2 <4 <2 < 3 < 2 < 3 <7 < 2 < 2 < 13 <5 VB3-2 08/27/20 < 16 < 21 < 2 < 2 <4 < 2 <4 <2 <4 <8 < 2 < 2 < 14 <5 VB5-2 09/10/20 < 14 < 16 < 1 < 2 < 3 < 2 < 3 <2 < 3 <3 < 2 < 2 < 7 < 2 VB6-1 09/10/20 < 14 < 16 < 2 < 2 <4 < 2 < 3 <2 < 3 <3 < 2 < 2 < 8 <3 VB7-1 09/10/20 < 17 < 17 <2 < 2 <4 <2 <4 <2 <4 <3 < 2 < 2 <9 < 3 VB8-2R 09/10/20 < 15 < 16 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 3 < 2 <2 < 8 < 3 VB9-1 09/10/20 < 14 < 29 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 3 < 2 < 2 < 8 < 3 VB10-1R 09/10/20 < 18 < 15 < 2 < 2 <4 <2 <4 < 2 < 3 < 3 < 2 < 2 < 10 < 3 VB11-1 09/10/20 < 16 < 20 < 2 < 2 <4 < 2 <4 < 2 <4 < 3 < 2 < 2 < 8 <3 VB9-1 09/17/19 < 50 < 68 < 5 < 7 < 14 <7 < 14 < 7 < 10 < 8 <7 <8 < 33 <5 VB10-1R 09/17/19 < 48 < 102 <4 < 6 < 8 <8 < 16 <7 < 11 <9 < 6 <7 < 22 < 10 VB11-1 09/17/19 < 43 < 50 < 5 < 5 < 10 <6 < 11 < 5 < 9 <8 < 5 <5 < 24 <8

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-233/234 U-235 U-238 MW-1430 12/10/20 < 0.02 < 0.02 < 0.05 < 0.18 < 0.16 0.77 +/- 0.34 < 0.06 0.49 +/- 0.27 MW-143D 12/10/20 Reanalysis 1.03 +/- 0.35 < 0.10 < 0.17 MW-143D 12/29/20 1.20 +/- 0.38 < 0.12 0.34 +/- 0.22 OJ I

01

TABLE B-I1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus)

DITCH F (DS-2) 03/24/20 < 186 DITCH F (DS-2) 04/22/20 < 178 DITCH F (DS-2) 08/19/20 < 175 < 6.7 < 0.7 < 0.8 < 0.9 DITCH F (DS-2) 10/26/20 < 191 SG-BW-102 DITCH C 03/24/20 < 186 SG-BW-102 DITCH C 04/22/20 < 185 SG-BW-102 DITCH C 09/16/20 < 182 < 6.0 < 0.8 < 1.0 < 0.4 SG-BW-102 DITCH C 10/26/20 < 195 B-6

TABLE 8-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2020 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE 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 La-140 DITCH F (DS-2) 08/19/20 < 18 < 33 < 2 <2 < 5 < 2 < 4 < 2 < 3 < 6 < 2 < 2 < 15 < 5 SG-BW-102 DITCH C 09/16/20 < 17 < 28 < 2 < 2 <4 < 2 < 4 < 2 <4 <7 <2 < 2 < 15 < 6 0:,

I

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