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Annual Radiological Environmental Operating Report
	ML20136A080
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Site:	Braidwood
Issue date:	05/31/2020
From:	; Teledyne Brown Engineering Environmental Services
To:	; Office of Nuclear Reactor Regulation
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ML20136A075	List: BW200037, Annual Radiological Environmental Operating Report; ML20136A078;
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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 2019 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Braidwood Station Braceville, IL 60407 May 2020

Intentionally left blank Table Of Contents I. Preface ............................................................................................................................. 1 II. Summary and Conclusions ............................................................................................. 8 Ill. Introduction ................................................................................................................... 10 A. Objectives of the REMP ..................................................................................... 10 B. Implementation of the Objectives ...................................................................... 10 IV. Program Description .................................................................................................... 11 A. Sample Collection .............................................................................................. 11 B. Sample Analysis ................................................................................................ 12 C. Data Interpretation ............................................................................................. 13 D. Program Exceptions .......................................................................................... 14 E. Program Changes ............................................................................................. 16 V. Results and Discussion ................................................................................................ 17 A. Aquatic Environment ......................................................................................... 17

1. Surface Water ......................................................................................... 17

2. Public Water ............................................................................................ 17

3. GroundNVell Water ................................................................................. 18

4. Fish ......................................................................................................... 19

5. Sediment ................................................................................................. 19 B. Atmospheric Environment ................................................................................. 20

1. Airborne .................................................................................................. 20

a. Air Particulates ............................................................................. 20

b. Airborne Iodine ............................................................................. 20 C. Terrestrial Environment ..................................................................................... 21

1. Milk .......................................................................................................... 21

2. Food Products ......................................................................................... 21 D. Ambient Gamma Radiation ............................................................................... 21 E. Land Use Survey ............................................................................................... 22 F. Errata Data ......................................................................................................... 23 G. Summary of Results - Inter-laboratory Comparison Program .......................... 23

Appendices Appendix A Radiological Environmental Monitoring Report Annual Summary Radiological Environmental Monitoring Program Annual Summary for Braidwood Station, 2019 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, 2019 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2019 Figures Figure B-1 Inner Ring and Other OSLO Locations of Braidwood Station, 2019 Figure B-2 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2019 Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2019 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, 2019 Table C-1.2 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-1.3 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-1.4 Concentrations of lron-55 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-1.5 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-11.1 Concentrations of Gross Beta in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 ii

Table C-11.2 Concentrations of Tritium in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-11.3 Concentrations of 1-131 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-11.4 Concentrations of Nickel-63 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-11.5 Concentrations of lron-55 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-11.6 Concentrations of Gamma Emitters in Public Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-111.1 Concentrations of Tritium in GroundNVell Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-111.2 Concentrations of Gamma Emitters in GroundNVell Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-IV.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-V.1 Concentrations of lron-55, Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vl.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-Vlll.3 Concentrations of Gamma Emitters in Grass Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Braidwood Station, 2019 Table C-X.1 Quarterly OSLO Results for Braidwood Station, 2019 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, 2019 iii

Table C-X.3 Summary of the Ambient Dosimetry Program for Braidwood Station, 2019 Figures Figure C-1 Surface Water - Gross Beta - Stations BD-10 and BD-25 (Control (C))

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Figure C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2007 - 2019 Figure C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2019 Figure C-4 Surface Water - Tritium - Stations BD-10 and BD-25 (C) Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2019 Figure C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2019 Figure C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-12 Ground/Well Water - Tritium - Stations BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2019 Figure C-13 Ground/Well Water - Tritium - Stations BD-53 and BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2019 Figure C-14 Air Particulate - Gross Beta - Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-15 Air Particulate - Gross Beta - Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-16 Air Particulate - Gross Beta - Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2019 Figure C-17 Air Particulate - Gross Beta - Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2019 iv

Figure C-18 Air Particulate - Gross Beta - Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2019 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2019 Table D-2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2019 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2019 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR) v

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.

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Annual Reports The Nuclear Regulatory Commission (NRG) 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 NRG to ensure this safety, they provide two reports annually to specifically address how the station's operation impacts the environment of local communities. The NRG then reviews these reports and makes them available to the public. The names of the reports are the Annual Radioactive Effluent Release Report (ARERR) and the Annual Radiological Environmental Operating Report (AREOR).

The ARERR reports the results of the sampling from the effluent release paths at the station analyzed for radioactivity. An effluent is a liquid or gaseous waste containing plant-related radioactive material emitted at the boundary of the facility.

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

G_ra{J~ic 1. Exameles of Gaseous and Ligu,id Eff_lu~Q_t 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 Hubb/esite The Electromagnellc Spectrum WaYelt- hlnm1ters About th9 s IH of:

Builc;lng111 J Grains Pralozo.ens Bacmria MCllecul&a Atoms An~leiel of sugar ""'

An atom is the smallest part of an element that maintains the characteristics of that element. Atoms are made up of three parts: protons, neutrons, and electrons.

Graphic 3. Structure of an Atom The number of protons in an atom determines the element. For example, a hydrogen atom will always have one proton while an oxygen atom will always have eight protons. The protons are clustered with the neutrons forming the nucleus at the center of the atom. Orbiting around the nucleus are the relatively small electrons.

Isotopes are atoms that have the same number of protons but different numbers of neutrons. Different isotopes of an element will all have the same chemical properties and many isotopes are radioactive while other isotopes are not

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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-lire 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

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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.

Industrial and Terrestrial (Soil) - 3%

Occupational lntemal-5% <0.1%

Consumer - 2%

Natural Sources - 50% ml Manmade Sources - 50%

-310 millirem (0.31 rem) -310 millirem (0.31 rem)

Source: NCRP Report No. 160 (2009)

Full report is wailable on the NCRP website ilt 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 Whole body CT 1,900 mllnr.tn (dllfle piocedww) u..,........-roe e11tJ_. x"""'Y

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(*1111uaJ) 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

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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 - - - - - - - - - - - - - - - - -

HeartDisease - - - - - - - - - - -

Smoking-Women - - - - - - - - - -

cancer - - - - - - - - -

Every 10 lbs overweight -

Stroke -

Motor Vehide Accident -

Air Pollution I Radon I Chemical Residue j n Foods I Drowning I Hurrkanes and Tornadoes lightning Nuclear Power 0 500 1000 1500 2000 2500 3000 Days of Lost Life Expectancy

' Hurricanes and Tornadoes Ughtnfng Nuclear Power I 0 0.2 0.4 0.6 0.8 1.2 14 1.6 1.8 II. Summary and Conclusions This report on the Radiological Environmental Monitoring Program (REMP) conducted for Exelon's Braidwood Station covers the period January 1, 2019 through December 31, 2019. During that time period 1,488 analyses were performed on 1,208 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of Braidwood Station had no adverse radiological impact on the environment.

Surface, public, and ground/well water samples were analyzed for concentrations of tritium and gamma-emitting nuclides. Surface water and public water samples were also analyzed for concentrations of gross beta. Gross beta and tritium activities detected were consistent with those detected in previous years. No fission or activation products were detected. As part of an effort to implement industry best practices, both gaseous and liquid station effluents were evaluated for all 10CFR61 required nuclides. Nuclides exceeding 1% relative abundance in the waste stream were added to the list of nuclides that Teledyne Brown evaluates in potentially impacted REMP matrices. For Braidwood Station, Nickel-63 (Ni-63) exceeds 1% relative abundance in the radwaste resins. Occasionally, Ni-63 is observed in liquid release tank quarterly composites, therefore, beginning in the fall of 2013 the station requested that Ni-63 be evaluated in the downstream surface water, sediment, and fish analyses. Ni-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. One of six sediment samples had Cs-137. The concentration was consistent with levels observed during the preoperational years.

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 lodine-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

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change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid. OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation). A dose evaluation was performed by taking the highest readings at the ISFSI pad and extrapolating dose to the nearest resident. The dose to the resident was estimated to be 3.20E-01 mrem in 2019.

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, 2019 through December 31, 2019.

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

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general collection methods used by EIML to obtain environmental samples for the Braidwood Station REMP in 2019. Sample locations and descriptions can be found in Table B-1 and Figures B-1 through B-3, Appendix B. The sampling methods used by EIML are listed in Table B-2.

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

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

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

22) and ground/well water samples collected quarterly from eight locations (BD-13, BD-34, BD-35, BD-36, BD-37, BD-50, BD-51 and BD-54). All samples were collected in new plastic bottles, which were rinsed with source water prior to collection per procedure. Fish samples comprising the flesh of quillback, golden redhorse, smallmouth bass, shorthead redhorse, common carp and largemouth bass were collected semiannually at three locations, BD-25 (C), BD-28 and BD-41. Sediment samples composed of recently deposited substrate were collected at three locations semiannually, BD-10, BD-25 (C), 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), BD-04, BD-05, BD-06, BD-19, BD-20 and BD-21]. Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters installed. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air particulate filters and air iodine cartridges were replaced weekly and sent to the laboratory for analysis.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on milk and food product samples. Milk samples were collected biweekly at one location, BD-18 (C), from May through October and monthly from November through April. All samples were collected in new two-gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite and shipped promptly to the laboratory.

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, BWD-G1 and BWD-G2). Various types of samples were collected and placed in new unused plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in 2012, 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 2019. 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:

i. 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 2019, the Braidwood Station REMP had a sample recovery rate in excess of 99.3%. 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 Sample not collected due to winterized outside tap and WW BD-36 01/10/19 absence of the owners. Sample collected on 01/17/19.

Lower reading of 141.5 hrs on the 8-day interval, possibly due AP/Al BD-04 01/01/19 to a power failure caused by severe cold.

Dosimeter not checked due to heavy snow. NOTE: OSLO OSLO BD-21 02/01/19 checked on 02/07/19 and found in satisfactory state.

Due to heavy snow on 02/01/19, samples collected on AP/Al BD-21 02/07/19 02/07/19 after2 weeks' run.

Sample collected in June instead of May due to dangerously SED BD-25 06/11/19 high water level during entire month.

Lower reading of 100.0 hrs on the 7 days period, possibly due AP/Al BD-02 07/18/19 to thunderstorms in the area. NOTE: Timer indicated 167.1 during 07/25/19 collection; normal reading for 7 days period.

Approximately 5 hrs missing, possibly due to a power failure.

AP/Al BD-04 10/23/19 NOTE: During the 10/31/19 collection, the timer showed 193.7 hrs; normal reading for the 8 days period.

Air Lower flow rate of 55 cfh due to snow clogging the intake port.

BD-03 10/31/19 Sampler Port cleaned, flow rate back to 60 cfh.

Air Lower flow rate of 53 cfh due to snow clogging the intake port.

BD-04 10/31/19 Sampler Port cleaned, flow rate back to 58 cfh.

Unusually low water level noticed in the compositor. All components checked; water intake valve readjusted.

Water BD-22 11/29/19 Compositor checked daily 12/02/19 to 12/04/19. Maintenance Compositor and recalibration performed on 12/05/19. Compositor now works as intended.

Table D-2 LISTING OF MISSED SAMPLES Sample Collection Location Code Reason Type Date

.l/Vl/V. *so.:52r*** 01/10119' **rtouse*vacant;~atertamed *off SW BD-55, BD-56 01/17/19 No sample; water frozen BD-10, BD-25, SW 01/24/19 No sample; water frozen BD-55, BD-56 BD-10, BD-25, BD-38 SW 02/01/19 No sample; water frozen BD-55, BD-56 SW BD-25, BD-55 02/07/19 No sample; water frozen SW BD-25, BD-55, BD-56 02/14/19 No sample; water frozen SW BD-55, BD-56 02/21/19 No sample; water frozen SW BD-25, BD-55, BD-56 02/28/19 No sample; water frozen BD-10, BD-25 SW 03/07/19 No sample; water frozen BD-55, BD-56 Dosimeters found missing during monthly visual check. Collector placed spares EX00041782S and EX00073339J. NOTE: Dosimeters found on OSLO BD-106 03/07/19 03/28/19 in a nearby ditch immersed in water.

Due to water exposure, sample determined damaged; discarded per station request.

Water level dangerously high during entire month.

SED BD-25 May, 2019 Location monitored, collection will be performed after water level decreases SW BD-25 05/09/19 No sample; gate locked due to high water level 05/02/19 BWD-N1, BWD-N2, No vegetation available; planting delayed due to VE 05/16/19 Control heavy rains and flooding 05/30/19 VE BWD-N1 06/13/19 Planted vegetation too small to collect 06/13/19 No vegetation available; planting delayed due to VE BWD-N2, Control 06/27/19 heavy rains and flooding Quads 1/2/3/4, No vegetables available. Planting and growth VE June,2019 Control delayed due to heavy rains and flooding.

No vegetables available. Planting and growth VE Quads 1/3/4, Control July, 2019 delayed due to heavy rains and flooding.

07/11/19 No suitable vegetation available; planting delayed VE BWD-G2 07/25/19 due to heavy rains and flooding.

No suitable vegetables available due to very few August & local residents planting gardens due to heavy VE Quads 1/3, Control September rains and floods in Spring and Summer. Some 2019 farmers changed or abandoned growing a bigger variety of crops.

Table D-2 LISTING OF MISSED SAMPLES (cont'd)

Sample Collection Location Code Reason Type Date No suitable vegetation available. Heavy rains and 09/19/19 flooding in Spring and early Summer caused VE Control 10/03/19 farmers to change or abandon growing a bigger 10/17/19 variety of crops.

09/19/19 10/03/19 Ml BD-18 10/17/19 Milk not available; cows idled due to owner injury.

10/31/19 11/14/19 SW BD-25 10/03/19 No sample; area inaccessible due to flood.

Quads 1/2/3/4, October, No suitable vegetation available due to late in VE Control 2019 season.

SW BD-56 11/14//19 No sample; water frozen SW BD-55, BD-56 12/19/19 No sample; water frozen 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 2019.

IV. Results and Discussion A. Aquatic Environment

1. Surface Water (SW)

**~******samples~were laRenweeRtyana~compositeclmontntyarsix locatiorrs (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 68 of 71 samples. The values ranged from 2.7 to 11.5 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 1240 +/- 201 pCi/L. Concentrations detected were consistent with those detected in previous years.

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

Nickel-63 Monthly samples beginning in April were analyzed for Ni-63 activity (Table C-1.3, Appendix C). Ni-63 was not detected and the required LLD was met.

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

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-1.4, Appendix C). No nuclides were detected and all required LLDs were met.

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-11.1, Appendix C). Gross beta was detected in 12of12 samples. The values ranged from 2.1 to 6.7 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-11.2, Appendix C). Tritium was detected in 10 of 12 samples. Concentrations ranged from 200 to 2, 110 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 (Table C-11.3, Appendix C). Iodine was not detected in any samples and the required LLD was met.

Nickel-63 Monthly samples were analyzed for Ni-63 activity. Ni-63 was not detected and the required LLD was met. (Table C-11.4, 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-11.5, Appendix C)

Gamma Spectrometry Samples from the location were analyzed for gamma-emitting nuclides (Table C-11.6, Appendix C). No nuclides were detected and all required LLDs were met.

3. Ground/Well Water (WW)

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

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-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 (Table C-111.2, Appendix C). No nuclides were detected and all required LLDs were met.

4. Fish Fish samples comprised of quillback, golden redhorse, smallmouth bass, shorthead redhorse, common carp and largemouth bass were collected at three locations (BD-25, BD-28, and BD-41) semiannually.

- - *** tocatiorrHD=28 coaltt*tre* affe-cteu brBraidwoodStatiorr'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 (Table C-IV.1, Appendix C). Ni-63 was not detected and the required LLD was met.

Nickel-63 The edible portion of fish samples from all three locations was analyzed for Ni-63 activity (Table C-IV.1, Appendix C). Ni-63 was not detected and the required LLD was met.

Gamma Spectrometry The edible portion of fish samples from all three locations was analyzed for gamma-emitting nuclides (Table C-IV.1, Appendix C). No fission or activation products were found. No nuclides were detected and all required LLDs were met.

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 (Table C-V.1, Appendix C). Fe-55 was not detected and the required LLD was met.

Nickel-63 Sediment samples from all three locations was analyzed for Ni-63 activity (Table C-V.1, Appendix C). Ni-63 was not detected and the required LLD was met.

Gamma Spectrometry Sediment samples from the location were analyzed for gamma-emitting nuclides (Table C-V.1, Appendix C). The fission product Cs-137 was detected at one location at a concentration of 169 +/- 99 pCi/kg dry. This concentration of Cs-137 were less than the required LLD for Cs-137 in sediment of 180 pCi/kg dry. Based on values calculated using NCRP Report 154, Cesium-137 In the Environment: Radioecology and Approaches to Assessment and Management (2006), expected decay-corrected concentrations of Cs-137 from fallout would be between 321 and 4819 pCi/kg dry. The activity detected is below these levels and consistent with fallout. No other Braidwood fission or activation products were found and all required LLDs were met.

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 5E-03 to 30E-03 pCi/m 3 with a mean of 15E-03 pCi/m 3 . The results from the far field (Group II) ranged from 6E-03 to 29E-03 pCi/m 3 with a mean of 15E-03 pCi/m 3 . The results from the Control location (Group Ill) ranged from ?E-03 to 29E-03 pCi/m 3 with a mean of 15E-03 pCi/m 3 . Comparison of the 2019 air particulate data with previous years' data indicate no effects from the operation of Braidwood Station. Additionally, a comparison of the weekly values for 2019 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 (Table C-Vl.3, Appendix C). No nuclides were detected and all required LLDs were met.

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 (Table C-Vll.1, Appendix C). All results were less than the minimum detectable concentration for i-131. The required LLD was met for all analyses.

C. Terrestrial Environment

...................1...Milk ..(MI.) .............................................

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. Location BD-17 sold all dairy cows in June, 2019, and milk location was discontinued. 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 ANSl/HPS N13.37, "Environmental Dosimetry". Results of OSLO measurements are listed in Tables C-X.1 to C-X.3, Appendix C.

In January 2020, discrepancies were identified with the 4th Quarter 2019 REMP OSLO dose readings when the report was provided to Braidwood Station by the vendor. The OSLO dose readings were unexpectedly higher than the previous three quarters. The control and spare OSLDs were 20-40 mrem higher, while the field OSLDs dose readings were 2-4 mrem higher compared to quarters 1, 2, and 3 of 2019. As documented in IR 04328318, an average of the 3rd and 4th quarter 2018 as well as the 1st, 2nd, and 3rd quarters in 2019 were used to estimate a dose for the 4th quarter 2019 OSLDs.

The 2019 calendar year resulted in 40 field OSLDs out of 57 total field OSLDs with positive annual facility dose on Attachment 6 from CY-AA-170-1001, "Environmental Dosimetry-Performance Specifications, Testing, and Data Analysis". In the past, Braidwood has reported no dose (ND) for annual facility dose because the sum of the 4 quarters for the year were within 3 standard deviations of the 5-year annual baseline. In the third quarter 2018, the method for calculating dose was revised. Control OSLDs are now kept inside a vault and a normalized field dose is calculated. The higher dose is in part because the control OSLD's are now inside of a "lead shielded" vault; they typically receive less dose than the previous storage method, which was not in a lead vault. Normalized field dose is the measured field dose adjusted to a standardized 91-day period of time for one quarter. This correction adjusts for the actual number of days of field deployment which could vary depending on such factors as weather, staff availability, holidays and the fact that the number of days in a year divided by 4 quarters is not a whole number. The corresponding normalized annual dose is then the sum of the four normalized quarterly doses. The standard 91-day quarter for normalizing dose is used for calculational purposes only. This mid-year 2018 change resulted in the doses for the last two quarters being higher than the first two quarters. However, the annual facility dose was within 3 standard deviations of the 5-year baseline from data gathered before the change to normalized dose. The first year with all four quarters calculated using normalized dose which resulted in an annual facility dose that was not within 3 standard deviations of the 5-year baseline data occurred in 2019. As additional data is collected in the next five years, the baseline will slowly trend towards a more representative dose value.

All OSLO measurements had a range of 12.5 to 34.2 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 0.32 mrem for the year.

E. Land Use Survey A Land Use Survey conducted during September 11, 2019, 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 ft2 in each of the sixteen 22 % degree sectors around the site. For dose calculation, a garden is assumed at the nearest residence. There were no notable changes to the 2019 land use census. The results of this survey are summarized below:

Distance in Miles from the Braidwood Station Reactor Buildings 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 1.30 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 2019 REMP. Appendix E includes errata information for the RGPP.

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 TBE's result and Analytics' known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

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

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

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

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

to +/- 30% of the reference value

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

For the TBE laboratory, 119 out of 129 analyses performed met the specified acceptance criteria. Ten analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program. A summary is found below:

1. The MAPEP February 2019 soil Sr-90 result was not submitted and therefore evaluated as Not Acceptable. The sample was run in duplicate, with results of -1.32 +/- 4.09 Bq/kg (<6.87) and -1.030 +/- 3.55 Bq/kg (<5.97). The known result was a false positive test (no significant activity). TBE did not submit a result because it appeared that the results may not be accurate. TBE analyzed a substitute soil Sr-90 sample from another vendor, with a result within the acceptable range.

(NCR 19-12)

2. The MAPEP February 2019 water Am-241 result was evaluated as Not Acceptable. The reported value was 0.764 +/- 0.00725 Bq/L with a known result of 0.582 Bq/L (acceptable range 0.407 - 0.757 Bq/L).

TBE's result falls within the upper acceptable range with the error. It appeared that a non-radiological interference was added and lead to an increased mass and higher result. (NCR 19-13)

3. The MAPEP February 2019 vegetation Sr-90 result was evaluated as Not Acceptable. The reported result was -0.1060 +/- 0.0328 Bq/kg and

- - - - *******the*knnwrrre*sultwas*afalse*pusitiveiest{no~ignificantactivity):*TBE!s result was correct in that there was no activity. MAPEP's evaluation was a "statistical failure" at 3 standard deviations. (NCR 19-14)

4. The ERA April 2019 water Cs-134 result was evaluated as Not Acceptable. The reported value was 15.2 pCi/L (error 2.82 pCi/L) and the known result was 12.1 pCi/L (acceptance range of 8.39 - 14.4 pCi/L). With the error, the reported result overlaps the acceptable range.

This sample was run as the workgroup duplicate on a different detector with a result of 10.7 pCi/L (within acceptable range). (NCR 19-10)

5. The ERA April 2019 water Sr-89 result was evaluated as Not Acceptable. The reported value was 44.9 pCi/L and the known result was 33.3 pCi/L (acceptance range of 24.5 - 40.1 pCi/L). The sample was only counted for 15 minutes instead of 200 minutes. The sample was re-prepped in duplicate and counted for 200 minutes with results of 30.7 +/- 5.37 pCi/L and 33.0 +/- 8.71 pCi/L. This was the 1st "high" failure for Sr-89 in 5 years. (NCR 19-11)

6. The MAPEP August 2019 soil Ni-63 result of 436 +/- 22.8 Bq/kg was evaluated as Not Acceptable. The known result was 629 Bq/kg (acceptable range 440 - 818 Bq/sample). With the associated error, the TBE result falls within the lower acceptance range. All associated QC was acceptable. No reason for failure could be found. This is the first failure for soil Ni-63 since 2012. (NCR 19-25).

7. The MAPEP August 2019 water Am-241 result was not reported and therefore evaluated as Not Acceptable. Initial review of the results showed a large peak where Am-241 should be (same as the February, 2019 sample results). It is believed that Th-228 was intentionally added as an interference. The sample was re-prepped and analyzed using a smaller sample aliquot. The unusual large peak (Th-228) was seen again and also this time a smaller peak (Am-241 ). The result was 436 +/-

22.8 Bq/L (acceptable range 0.365 +/- 0.679 Bq/L). Th-228 is not a typical nuclide requested by clients, so there is no analytical purpose to take samples through an additional separation step. TBE will pursue using another vendor for Am-241 water cross-checks that more closely reflects actual customer samples. (NCR 19-26)

8. The Analytics September 2019 soil Cr-51 sample was evaluated as Not Acceptable. TBE's reported result of 0.765 +/- 0.135 pCi/g exceeded the upper acceptance range (140% of the known result of 0.547 pCi/g). The TBE result was within the acceptable range (0.63 - 0.90 pCi/g) with the associated error. The Cr-51 result is very close to TBE's normal detection limit. In order to get a reportable result, the sample must be counted for 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> (1 Ox longer than client samples). There is no client or regulatory requirement for this nuclide and TBE will remove Cr-51 from the reported gamma nuclides going forward. (NCR 19-27)

9. The ERA October 2019 water Gross Alpha result was evaluated as Not Acceptable. TBE's reported result was 40.5 +/-'10.3 pCi/L and the known result was 27.6 pCi/L (ratio of TBE to known result at 135%). With the associated error, the result falls within the acceptable range (14.0 - 36.3 pCi/L). The sample was run as the workgroup duplicate on a different detector with a result of 30.8 +/- 9.17 pCi/L (within the acceptable range).

This was the first failure for drinking water Gross Alpha since 2012.

(NCR 19-23)

10. The ERA October 2019 water Sr-90 result was evaluated as Not Acceptable. TBE's reported result was 32.5 +/- 2.12 pCi/L and the known result was 26.5 pCi/L (ratio of TBE to known result at 123%). With the associated error, the result falls within the acceptable range (19.2 - 30.9 pCi/L). The sample was run as the workgroup duplicate on a different detector with a result of 20.0 +/- 1.91 pCi/L (within the acceptable range).

Both TBE results are within internal QC limits. A substitute "quick response" sample was analyzed with an acceptable result of 18.6 pCi/L (known range of 13.2 - 22.1 pCi/L). (NCR 19-24)

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, 2019 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2019 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 5.4 4.4 7.5 BD-40 INDICATOR 0 (PCl/LITER) (47/59) (11/12) (12/12) BRAIDWOOD STATION COOLING LAKE 2.7-11.5 3.0-8.0 5.8-11.5 ONSITE H-3 24 200 1240 <LLD 1240 BD-10 INDICATOR 0 (1/20) (1/20) KANKAKEE RIVER DOWNSTREAM 5.4 MILES NE OF SITE Nl-63 18 30 <LLD <LLD 0 FE-55 18 200 <LLD <LLD 0 GAMMA 71

)>

I

...lo.

MN-54 15 <LLD <LLD 0 C0-58 15 <LLD <LLD 0 FE-59 30 <LLD <LLD 0 C0-60 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-8 12 4 3.8 NA 3.8 BD-22 INDICATOR 0 (PCllL/TER) (12/12) (12112) WILMINGTON 2.1-6.7 2.1- 6.7 6.0 MILES NE OF SITE H-3 12 200 936 NA 936 BD-22 INDICATOR 0 (10112) (10112) WILMINGTON 200-2110 200- 2110 6.0 MILES NE OF SITE 1-131 12 1 <LLD NA 0 Nl-63 9 30 <LLD <LLD 0 FE-55 9 200 <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, 2019 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2019 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 (PCl!LJTER) MN-54 15 <LLD NA 0 C0-58 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

)> LA-140 15 <LLD NA 0 I

I\)

GROUND WATER H-3 31 200 <LLD NA 0 (PCllL/TER)

GAMMA 31 MN-54 15 <LLD NA 0 C0-58 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 (PCllKG WET)

Nl-63 12 260 <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, 2019 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2019 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 (PCl/KG WET) MN-54 130 <LLD <LLD 0 C0-58 130 <LLD <LLD 0 FE-59 260 <LLD <LLD 0 C0-60 130 <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 CS-137 150 <LLD <LLD 0 l>

I BA-140 NA <LLD <LLD 0

~

LA-140 NA <LLD <LLD 0 SEDIMENT FE-55 6 2000 <LLD <LLD 0 (PCl!KG DRY)

Nl-63 6 260 <LLD <LLD 0 GAMMA 6 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-134 150 <LLD <LLD 0 CS-137 180 169 <LLD 169 BD-57 INDICATOR 0 (1/4) (1/4) CIRC. WATER SLOWDOWN DISCH 5.4 MILES E OF SITE BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2019 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2019 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN(~)

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 415 10 15 15 16 BD-21 INDICATOR 0 (E-3 PC/ICU.METER) (363/363) (52/52) (51/51) NEARSITE NE 5-30 7-29 8-30 0.5 MILES NE OF SITE GAMMA 32 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

)>

I CS-134 50 <LLD <LLD 0

.s:. CS-137 60 <LLD <LLD 0 BA-140 NA <LLD <LLD 0 LA-140 NA <LLD <LLD 0 AIR IODINE GAMMA 415 (E-3 PC/ICU.METER) 1-131 70 <LLD <LLD 0 MILK 1-131 15 1 <LLD <LLD 0 (PCllLJTER)

GAMMA 15 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.

TABLEA-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2019 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS: 50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD: 2019 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 (PCllKG WE7) MN-54 NA C0-58 NA FE-59 NA C0-60 NA ZN-65 NA NB-95 NA ZR-95 NA CS-134 60 CS-137 60 BA-140 80

)>

I LA-140 NA C1I NA VEGETATION GAMMA 66 (PCl/KG WE7) 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 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 184 NA 15.9 13 32.3 BD-ISFSl-105-4 INDICATOR 0 (MILL/REM.IQ TR.) (180/180) (4/4) (4/4) 12.5-34.2 14.7-15.6 30.2- 34.2 0.20 MILES SE (M) The Mean Values are calculated using the positive values. (F) Fraction of delectable 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, 2019 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) On site 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 I Monthly BD-18 Biros' Farm (control) 8.7 miles W E. Air Particulates I 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) 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 Circulating Water Slowdown Discharge BD-57 5.4 miles E (indicator)

H. Food Products BWD-G1 Nearsite NE 0.54 miles NE BWD-G2 Nearsite W 0.21 miles W Quadrant 1 Clark Farm 3.8 miles ENE Quadrant 2 W.F. Soltwisch 4.5 miles SSE Quadrant 3 Terri Schultz 4.8 miles SSW Quadrant 4 Bruce Sinkular 1.9 miles NNW Control Gorman Farm 9.0 miles NE

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2019 Distance & Direction Location Location Description From Site I. Environmental Dosimetry - OSLO Inner Ring BO-TOT~~ * *o:5milesf\f***

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 0.4 miles WNW BD-115 0.3 miles NW BD-116 0.4 miles NNW Outer Ring BD-201 4.2 miles N BD-202 4.8 miles NNE BD-203 4.9 miles NE BD-204 4.3 miles ENE BD-205 4.0 miles E BD-206 4.5 miles ESE BD-207 4.5 miles SE BD-208 4.5 miles SSE BD-209 4.8 miles S BD-210 5.3 miles SSW BD-211 4.8 miles SW BD-212 5.0 miles WSW BD-213 4.8 miles W BD-214 4.3 miles WNW BD-215 4.5 miles NW BD-216 4.0 miles NNW Other BD-02 Custer Park (indicator) 5.0 miles E BD-03 13000 W. Road (control) 6.2 miles ESE BD-04 Essex (indicator) 4.8 miles SSE BD-05 Gardner (indicator) 5.5 miles SW BD-06 Godley (indicator) 0.5 miles WSW BD-19 Nearsite NW (indicator) 0.3 miles NW BD-20 Nearsite N (indicator) 0.6 miles N BD-21 Nearsite NE (indicator) 0.5 miles NE ISFSI BD-ISFSl-104-3 0.11 miles E BD-ISFSl-104-4 0.13 miles E BD-ISFSl-105-3 0.23 miles SE BD-ISFSl-105-4 0.20 miles SE BD-ISFSl-110-3 0.18 miles SE BD-ISFSl-110-4 0.15 miles SE

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2019 Distance in Miles from the Braidwood Station ISFSI Pad, 2019 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, 2019 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

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2019 Sample Analysis Sampling Method Analytical Procedure Number Medium Surface Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Monthly composite from weekly grab samples

~ ~ \lll'~t:~ *~** Spectroscopy-~* Analysis Surface TBE, TBE-2008 Gross Alpha and/or Gross Beta Gross Beta Monthly composite from weekly grab samples Water Activity in Various Matrices Surface lron-55 Monthly composite from weekly grab samples TBE, TBE-2006 lron-55 Activity in Various Matrices Water Surface TBE, TBE-2013 Radionickel Activity in Various Nickel-63 Monthly composite from weekly grab samples Water Matrices Surface TBE, TBE-2011 Tritium Analysis in Drinking Water by Tritium Quarterly composite from weekly grab samples Water Liquid Scintillation TBE, TBE-2007 Gamma-Emitting Radioisotope Drinking Gamma Monthly composite from weekly composite Analysis Water Spectroscopy samples TBE. TBE-2023 Compositing of Samples TBE, TBE-2008 Gross Alpha and/or Gross Beta Drinking Monthly composite from weekly composite Activity in Various Matrices Gross Beta Water samples TBE. TBE-2023 Compositing of Samples Drinking Monthly composite from weekly composite TBE, TBE-2012 Radioiodine in Various Matrices Iodine Water samples TBE. TBE-2023 Compositing of Samples Drinking lron-55 Monthly composite from weekly grab samples TBE, TBE-2006 lron-55 Activity in Various Matrices Water Drinking TBE, TBE-2013 Radionickel Activity in Various Nickel-63 Monthly composite from weekly grab samples Water Matrices TBE, TBE-2011 Tritium Analysis in Drinking Water by Drinking Monthly composite from weekly composite Liquid Scintillation Tritium Water samples TBE. TBE-2023 Compositing of Samples Ground/ Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Quarterly grab sample Well Water Spectroscopy Analysis Ground/ TBE, TBE-2011 Tritium analysis in Drinking Water by Tritium Quarterly grab sample Well Water Liquid Scintillation Gamma Semi-annual samples collected via TBE, TBE-2007 Gamma-Emitting Radioisotope Fish Spectroscopy electro-shocking or other techniques Analysis 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 TBE, TBE-2013 Radionickel Activity in Various Fish Nickel-63 electroshocking or other techniques Matrices 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 TBE, TBE-2013 Radionickel Activity in Various Sediment Nickel-63 Semi-annual grab samples Matrices

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2019 Sample Analysis Sampling Method Analytical Procedure Number Medium Air One-week composite of continuous air TBE, TBE-2008 Gross Alpha and/or Gross Beta Gross Beta Particulates sampling through glass fiber filter paper Activity in Various Matrices TBE, TBE-2007 Gamma-Emitting Radioisotope Air Gamma Analysis Quarterly composite of each station Particulates Spectroscopy TBE. TBE-2023 Compositing of Samples Weekly composite of continuous air sampling TBE, TBE-2007 Gamma-Emitting Radioisotope Air Iodine 1-131 through charcoal filter Analysis Gamma Bi-weekly grab sample May through October. TBE, TBE-2007 Gamma-Emitting Radioisotope Milk Spectroscopy Monthly all other times Analysis Bi-weekly grab sample May through October.

Milk 1-131 TBE, TBE-2012 Radioiodine in Various Matrices Monthly all other times Food Gamma TBE, TBE-2007 Gamma-Emitting Radioisotope Grab samples during the growing season Products Spectroscopy Analysis Optically Stimulated Quarterly OSLDs comprised of two Al203:C OSLO Landauer Incorporated Luminescence Landauer Incorporated elements.

Dosimetry

t i

1. Braictwood Station

~ I

2. Inner Ring Dosimeters

'.:! i

~c Figure B-1 Inner Ring and Other OSLO Locations of Braidwood Station, 2019

1. Braidwood Station

2. Outer Ring Dosimeters

3. Afr Sampling Locations Figure B-2 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2019

6r11ldwood IL 113

.SJ Braidwood Station

-~

-~ *..:

~

J....,_c..,.,...Lm~e-Rrl-..a,..---t-N t OFFSITE DOSE CALCULATION MANUAL BRAIDWOOD STATION 0 1 2 3 4 5 FIGURE 11-3 Im 111 I I I I I Miles !NQESTIOH AND WATEROORNE EXPOSURE PATHWAYSAMPLEIJ.JCAT!OUS

Water fl Sedunent

Fish )( Milk Figure B-3 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2019

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, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/03/19 - 01/10/19 4.9 +/- 2.1 4.0 +/- 2.0 4.3 +/- 2.3 6.5 +/- 2.3 2.7 +/- 1.7 < 2.9 02/01/19 - 02/28/19 4.7 +/- 2.1 3.3 +/- 2.1 3.7 +/- 2.3 8.1 +/- 2.6 (1) < 2.4 03/07/19 - 03/28/19 5.8 +/- 2.0 3.0 +/- 1.8 3.7 +/- 2.2 5.8 +/- 2.2 3.1 +/- 1.7 < 2.6 04/04/19 - 04/25/19 < 3.1 3.3 +/- 2.2 < 3.5 6.9 +/- 2.5 < 2.5 < 3.4 05/02/19 - 05/30/19 5.9 +/- 2.0 6.9 +/- 2.1 4.2 +/- 2.2 9.2 +/- 2.7 3.2 +/- 1.7 5.7 +/- 2.1 06/06/19 - 06/27 /19 3.5 +/- 2.2 3.4 +/- 2.1 < 3.7 8.2 +/- 2.9 < 2.7 6.1 +/- 2.5 07/03/19 - 07/25/19 3.9 +/- 1.8 3.0 +/- 1.7 4.0 +/- 1.9 7.2 +/- 2.2 3.9 +/- 1.6 4.7 +/- 1.9 08/01/19 - 08/29/19 4.7 +/- 2.2 4.8 +/- 2.2 11.1 +/- 3.3 11.5 +/- 2.8 3.6 +/- 1.8 < 2.8 09/05/19 - 09/26/19 3.7 +/- 2.1 5.1 +/- 2.2 5.3 +/- 2.6 7.4 +/- 2.4 3.7 +/- 1.8 7.3 +/- 2.5 10/03/19 - 10/31/19 3.5 +/- 1.9 4.0 +/- 1.9 4.0 +/- 2.2 6.0 +/- 2.3 3.2 +/-1.7 < 2.7 11/07/19 - 11/29/19 3.8 +/- 2.1 < 2.7 7.3 +/- 2.8 7.4 +/- 2.6 3.0 +/- 1.7 7.4 +/- 2.2 12/06/19 - 12/26/19 4.4 +/- 1.9 8.0 +/- 2.2 5.1 +/- 2.2 5.8 +/- 2.2 2.7 +/- 1.6 < 2.6 MEAN+/- 2 STD DEV 4.4 +/- 1.7 4.4 +/- 3.3 5.3 +/- 4.6 7.5 +/- 3.2 3.2 +/- 0.8 6.3 +/- 2.3 Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/03/19 - 03/28/19 < 190 < 194 < 181 < 185 < 187 < 190 04/04/19 - 06/27/19 < 195 < 188 < 195 < 195 < 193 < 197 07/03/19 - 09/26/19 1240 +/- 201 < 193 < 190 < 191 < 193 < 193 10/03/19 - 12/26/19 < 194 < 199 < 193 < 198 < 195 < 198 MEAN +/- 2 STD DEV 544 +/- 802 THE MEAN AND TWO STANDARD DEVIATION ARE CAL CULA TED 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, 2019 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 04/04/19 - 04/25/19 < 18 < 17 05/02/19 - 05/30/19 < 19 < 18 06/06/19 - 06/27 /19 < 17 < 16 07/03/19 - 07/25/19 < 17 < 16 08/01 /19 - 08/29/19 < 17 < 16 09/05/19 - 09/26/19 < 17 < 18 10/03/19 - 10/31/19 < 18 < 17 11/07/19 - 11/29/19 < 16 < 16 12/06/19 - 12/26/19 < 18 < 17 MEAN Table C-1.4 CONCENTRATIONS OF IRON-55 IN SURFACE WATER SAMPLES COLLECTED IN THE VACINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 04/04/19 - 04/25/19 < 112 < 69 05/02/19 - 05/30/19 < 43 < 72 06/06/19 - 06/27/19 < 68 < 44 07/03/19 - 07/25/19 < 84 < 50 08/01/19 - 08/29/19 < 70 < 70 09/05/19 - 09/26/19 < 49 < 44 10/03/19 - 10/31/19 < 51 < 115 11/07/19 - 11/29/19 < 38 < 61 12/06/19 - 12/26/19 < 86 < 87 MEAN C-2

Table C-1.5 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 01/03/19 - 01/17/19 < 3 < 3 < 7 < 3 < 6 < 3 < 5 < 14 < 3 < 3 < 23 < 8 02/07/19 - 02/28/19 < 5 < 5 < 11 < 5 < 10 < 5 < 9 < 9 < 6 < 6 < 24 < 7 03/14/19 - 03/28/19 < 8 < 7 < 15 < 6 < 11 < 7 < 14 < 12 < 7 < 8 < 37 < 12 04/04/19 - 04/25/19 <7 < 6 < 19 < 6 < 14 < 7 < 10 < 11 < 8 < 6 < 33 < 12 05/02/19 - 05/30/19 < 5 < 6 < 11 < 6 < 11 < 6 < 9 < 13 < 6 < 6 < 33 < 10 06/06/19 - 06/27/19 < 2 < 2 < 5 < 2 <4 < 2 < 4 < 9 < 2 < 2 < 18 < 5 07/03/19 - 07/25/19 < 2 < 2 < 5 < 2 <4 < 2 < 4 < 7 < 2 < 2 < 15 < 5 08/01/19 - 08/29/19 < 4 <4 < 10 < 5 < 10 < 5 < 9 < 14 < 5 < 4 < 33 < 13 09/05/19 - 09/26/19 < 7 < 6 < 15 < 6 < 12 < 7 < 12 < 15 < 5 < 7 < 33 < 9 10/03/19 - 10/31/19 < 4 < 5 < 7 < 6 < 10 < 3 < 8 < 12 < 4 < 5 < 26 < 10 11/07/19 - 11/29/19 < 5 < 5 < 13 < 5 < 9 < 6 < 9 < 13 < 5 < 5 < 34 < 11 12/06/19 - 12/26/19 < 5 < 5 < 11 < 6 < 8 < 5 < 10 < 13 < 6 < 6 < 39 < 9 MEAN BD-25 01 /03/19 - 01117/19 < 2 <2 < 6 < 3 < 5 < 3 < 5 < 12 < 3 < 2 < 23 < 9 02/21/19 - 02/28/19 < 6 < 6 < 16 < 7 < 14 < 6 < 11 < 14 < 7 < 7 < 37 < 11 03/14/19 - 03/28/19 < 6 < 8 < 12 < 7 < 10 < 8 < 12 < 13 < 7 < 6 < 38 < 14 0I 04/04/19 - 04/25/19 < 6 < 5 < 13 < 7 < 15 < 8 < 12 < 10 < 6 < 7 < 23 < 9 Cl) 05/02/19 - 05/30/19 <6 < 7 < 13 < 8 < 10 < 9 < 12 < 14 < 7 < 7 < 41 < 12 06/06/19 - 06/27/19 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 16 < 5 07/03/19 - 07/25/19 < 2 <2 < 5 < 3 < 5 < 2 < 4 < 7 < 2 < 2 < 15 < 6 08/01 /19 - 08/29/19 < 4 <4 < 10 < 4 < 9 < 5 < 8 < 11 < 5 <4 < 29 < 10 09/05/19 - 09/26/19 < 6 < 6 < 13 < 5 < 10 < 7 < 10 < 14 < 6 < 6 < 34 < 8 10/10/19 - 10/31/19 < 6 < 5 < 13 < 6 < 12 < 5 < 8 < 12 < 6 < 6 < 32 < 11 11/07/19 - 11/29/19 < 3 < 5 < 9 < 5 < 9 < 5 < 7 < 13 < 5 < 5 < 30 < 10 12/06/19 - 12/26/19 < 3 < 3 < 7 < 3 < 7 < 3 < 6 < 9 < 3 < 3 < 22 < 7 MEAN BD-38 01/03/19 - 01/24/19 < 5 < 5 < 10 < 4 < 9 < 6 < 9 < 13 < 5 < 5 < 31 < 10 02/07/19 - 02/28/19 < 5 < 6 < 12 < 4 < 12 < 4 < 9 < 11 < 5 < 5 < 29 < 10 03/07/19 - 03/28/19 < 5 < 8 < 15 < 9 < 21 < 9 < 15 < 13 < 6 < 9 < 42 < 13 04/04/ 19 - 04125/1 9 < 9 < 6 < 17 < 9 < 14 < 7 < 12 < 10 < 6 < 6 < 35 < 11 05/02/19 - 05/30/19 < 5 <6 < 11 < 6 < 13 < 6 < 7 < 15 < 5 < 6 < 30 < 7 06/06/19 - 06/27/19 < 2 < 2 < 5 < 2 < 3 < 2 < 3 < 9 < 2 < 2 < 16 < 5 07/03/19 - 07/25/19 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 7 < 2 < 2 < 16 < 5 08/01/19 - 08/29/19 < 4 < 4 < 11 < 5 < 10 < 5 < 7 < 14 < 5 < 5 < 33 < 12 09/05/19 - 09/26/19 < 7 < 6 < 12 < 7 < 12 < 5 < 9 < 13 < 5 < 7 < 35 < 15 10/03/19 - 10/31/19 < 5 < 4 < 12 < 5 < 12 < 6 < 9 < 14 < 6 < 6 < 31 < 11 11/07/19 - 11/29/19 < 3 < 3 < 8 < 4 < 7 < 3 < 5 < 10 < 4 <4 < 22 < 8 12/06/19 - 12/26/19 < 3 < 3 < 7 < 3 < 5 < 3 < 4 < 8 < 3 < 2 < 18 < 6 MEAN

Table C-1.5 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 /03/19 - 01 /24/19 < 5 < 5 < 10 < 4 < 12 < 6 < 9 < 14 < 5 < 6 < 31 < 11 02/01 /19 - 02/28/19 < 4 < 4 < 11 < 3 < 7 < 5 < 11 < 8 < 5 < 7 < 29 < 8 03/07 /19 - 03/28/19 < 9 < 7 < 17 < 7 < 17 < 11 < 16 < 15 < 9 < 7 < 39 < 12 04/04/19 - 04/25/19 < 6 < 5 < 10 < 5 < 11 < 6 < 4 < 12 < 7 < 5 < 33 < 7 05/02/19 - 05/30/19 < 6 < 6 < 11 < 7 < 11 < 6 < 11 < 14 < 6 < 5 < 29 < 9 06/06/19 - 06/27/19 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 9 < 2 < 2 < 16 < 5 07 /03/19 - 07/25/19 < 2 < 2 < 4 < 2 < 4 < 2 < 4 < 6 < 2 < 2 < 13 < 5 08/01/19 - 08/29/19 < 5 < 5 < 11 < 5 < 11 < 5 < 9 < 14 < 6 < 5 < 33 < 10 09/05/19 - 09/26/19 < 5 < 5 < 10 < 4 < 10 < 5 < 9 < 11 < 5 <4 < 26 < 10 10/03/19 - 10/31/19 <4 < 6 < 11 < 6 < 11 < 5 < 9 < 12 < 5 < 5 < 27 < 8 11/07/19 - 11/29/19 < 4 < 5 < 13 < 6 < 9 < 5 < 7 < 15 < 5 < 5 < 36 < 12 12/06/19 - 12/26/19 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 8 < 3 < 3 < 21 < 6 MEAN BD-55 01/03/19 - 01/10/19 < 3 < 3 < 8 < 3 < 5 < 4 < 6 < 12 < 3 < 3 < 39 < 11 02/01/19 - 02/28/19 (1) 03/14/19 - 03/28/19 < 7 < 8 < 16 < 10 < 13 < 8 < 12 < 14 < 8 < 8 < 36 < 14 0 04/04/19 - 04/25/19 < 7 < 7 < 15 < 7 < 14 < 6 < 14 < 11 < 7 < 9 < 29 < 11

.. 05/02/19 - 05/30/19 < 6 < 6 < 11 < 5 < 10 < 7 < 11 < 14 < 7 < 7 < 41 < 13 06/06/19 - 06/27/19 < 2 < 2 < 5 < 2 < 4 < 2 < 3 < 9 < 2 < 2 < 17 < 6 07/03/19 - 07/25/19 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 10 < 3 < 3 < 20 < 6 08/01/19 - 08/29/19 < 5 < 5 < 11 < 5 < 11 < 6 < 10 < 14 < 5 < 5 < 38 < *12 09/05/19 - 09/26/19 < 6 < 6 < 12 < 7 < 15 < 6 < 10 < 15 < 6 < 7 < 36 < 11 10/03/19 - 10/31/19 < 5 < 7 < 13 < 5 < 10 < 4 < 8 < 12 <4 < 4 < 33 < 9 11/07/19 - 11/29/19 < 5 < 5 < 11 < 5 < 10 < 6 < 9 < 13 < 5 < 5 < 32 < 9 12/06/19 - 12/26/19 < 5 < 5 < 12 < 5 < 10 < 5 < 9 < 14 < 5 < 5 < 30 < 9 MEAN BD-56 01 /03/19 - 01/10/19 < 3 < 3 < 7 < 3 < 5 < 3 < 6 < 10 < 3 < 3 < 38 < 13 02/07/19 - 02/07/19 < 3 < 3 < 7 < 3 < 6 < 4 < 6 < 13 < 3 < 3 < 40 < 13 03/14/19 - 03/28/19 < 5 < 9 < 17 < 9 < 16 < 8 < 13 < 11 < 9 < 8 < 36 < 14 04/04/19 - 04/25/19 < 5 < 5 < 13 < 7 < 13 < 7 < 13 < 9 < 5 < 6 < 27 < 13 05/02/19 - 05/30/19 < 5 < 8 < 10 < 8 < 14 < 6 < 12 < 15 < 6 <6 < 40 < 13 06/06/19 - 06/27/19 < 1 < 2 < 4 < 2 < 4 < 2 < 3 < 9 < 2 < 2 < 17 < 6 07/03/19 - 07/25/19 < 2 < 2 < 6 < 2 < 4 < 3 <4 < 7 < 2 < 2 < 16 < 5 08/01/19 - 08/29/19 < 5 < 5 < 10 < 6 < 14 < 6 < 10 < 14 < 6 < 6 < 40 < 11 09/05/19 - 09/26/19 < 6 < 5 < 13 < 7 < 10 < 5 < 10 < 13 < 5 < 6 < 29 < 12 10/03/19 - 10/31/19 < 5 < 5 < 12 < 6 < 12 < 6 < 7 < 11 < 6 < 5 < 32 < 12 11 /07 /19 - 11 /29/19 < 4 < 5 < 8 < 4 < 9 < 5 < 7 < 12 < 5 < 4 < 27 < 9 12/06/19 - 12/26/19 < 4 < 4 < 10 < 5 < 11 < 6 < 11 < 14 < 6 < 5 < 35 < 14 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION

Table C-11.1 CONCENTRATIONS OF GROSS BETA IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/27/18 - 01/24/19 2.4 +/- 1.5 01/24/19 - 02/28/19 2.1 +/- 1.4 02/28/19 - 03/28/19 3.8 +/- 1.6 03/28/19 - 04/25/19 3.0 +/- 1.6 04/25/19 - 05/30/19 4.1 +/- 1.7 05/30/19 - 06/27/19 3.7 +/- 1.6 06/27/19 - 07/25/19 3.4 +/- 1.7 07 /25/19 - 08/29/19 4.1 +/- 1.9 08/29/19 - 09/26/19 3.4 +/- 1.6 09/26/19 - 10/31/19 5.8 +/- 1.7 10/31/19 - 11/29/19 6.7 +/- 1.7 11 /29/19 - 12/26/19 3.8 +/- 1.6 MEAN+/- 2 STD DEV 3.8 +/- 1.9 Table C-11.2 CONCENTRATIONS OF TRITIUM IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/27/18 - 01/24/19 764 +/- 155 01/24/19 - 02/28/19 < 193 02/28/19 - 03/28/19 200 +/- 125 03/28/19 - 04/25/19 < 192 04/25/19 - 05/30/19 325 +/- 128 05/30/19 - 06/27/19 420 +/- 134 06127 /19 - 07/25/19 562 +/- 140 07/25/19 - 08/29/19 1940 +/- 263 08/29/19 - 09/26/19 2110 +/- 278 09/26/19 - 10/31/19 1170 +/- 189 10/31/19 - 11/29/19 1180 +/- 192 11 /29/19 - 12/26/19 690 +/- 150 MEAN+/- 2 STD DEV 936 +/- 1319 Table C-11.3 CONCENTRATIONS OF 1-131 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD BD-22 12/27/18 - 01/24/19 < 0.7 01 /24/19 - 02/28/19 < 0.8 02/28/19 - 03/28/19 < 0.8 03/28/19 - 04/25/19 < 0.7 04/25/19 - 05/30/19 < 0.7 05/30/19 - 06127 /19 < 0.8 06/27/19 - 07/25/19 < 0.8 07 /25/19 - 08/29/19 < 0.6 08/29/19 - 09/26/19 < 0.8 09/26/19 - 10/31/19 < 0.8 10/31/19 - 11/29/19 < 0.6 11 /29/19 - 12/26/19 < 0.8 MEAN THE MEAN AND TWO STANDARD DEVIATION 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, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION

** ~ ** PERIOD*************** ** BE>=22*

03/28/19 - 04/25/19 < 21 04/25/19 - 05/30/19 < 25 05/30/19 - 06/27/19 < 23 06/27/19 - 07/25/19 < 24 07 /25/19 - 08/29/19 < 22 08/29/19 - 09/26/19 < 18 09/26/19 - 10/31/19 < 20 10/31/19 - 11/29/19 < 16 11 /29/19 - 12/26/19 < 20 MEAN Table C-11.5 CONCENTRATIONS OF IRON-55 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 03/28/19 - 04/25/19 < 62 04/25/19 - 05/30/19 < 55 05/30/19 - 06/27 /19 < 78 06/27/19 - 07/25/19 < 14 07 /25/19 - 08/29/19 < 55 08/29/19 - 09/26/19 < 24 09/26/19 - 10/31/19 < 74 10/31/19 - 11/29/19 < 58 11 /29/19 - 12/26/19 < 58 MEAN C-6

Table C-11.6 CONCENTRATIONS OF GAMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 12/27/18 - 01/24/19 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 17 < 5 01/24/19 - 02/28/19 < 7 < 8 < 16 < 7 < 14 < 8 < 15 < 8 < 7 < 39 < 9 02/28/19 - 03/28/19 < 5 < 5 < 8 < 5 < 8 < 4 < 9 <4 <4 < 28 < 10 03/28/19 - 04/25/19 < 4 < 5 < 10 < 5 < 10 < 4 < 9 < 5 < 4 < 31 < 11 04/25/19 - 05/30/19 < 7 < 7 < 14 < 5 < 13 < 7 < 12 < 6 < 6 < 31 < 12 05/30/19 - 06/27/19 <4 <4 < 10 < 4 < 8 < 4 < 7 < 4 < 4 < 27 < 10 06/27/19 - 07/25/19 < 2 < 2 < 4 < 2 < 3 < 2 <4 < 2 < 2 < 16 < 5 07/25/19 - 08/29/19 < 7 < 6 < 15 < 6 < 15 < 8 < 13 < 7 < 5 < 41 < 13 08/29/19 - 09/26/19 < 5 < 5 < 9 < 5 < 10 < 5 < 8 <4 < 6 < 24 < 8 09/26/19 - 10/31/19 < 6 < 6 < 16 < 7 < 12 < 8 < 10 < 7 < 5 < 37 < 14 10/31/19 - 11/29/19 <6 < 5 < 12 < 5 < 12 < 6 < 10 < 5 < 5 < 27 < 7 11 /29/19 - 12/26/19 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 3 < 3 < 18 < 5 0 MEAN I

Table C-111.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECIION .........

PERIOD 80-13 80-34 80-35 80-36 80-37 80-50 80-51 80-54 01/10/19 - 01/17/19 < 187 < 185 < 189 < 196 < 191 < 186 < 193 (1) 04/11/19 - 04/11/19 < 182 < 189 < 185 < 187 < 185 < 185 < 190 < 189 07/11/19 - 07/11/19 < 193 < 199 < 196 < 195 < 197 < 196 < 191 < 195 10/10/19 - 10/10/19 < 192 < 194 < 192 < 194 < 189 < 194 < 193 < 191 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-8

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 01/10/19 - 01/10/19 < 7 < 4 < 10 < 10 < 13 < 8 < 13 < 10 < 5 < 7 < 32 < 15 04/11/19 - 04/11/19 < 8 < 5 < 15 < 7 < 11 < 7 < 11 < 10 < 7 < 7 < 31 < 9 07/11/19 - 07/11/19 < 5 < 5 <9 < 5 < 9 < 5 < 9 < 8 < 5 < 5 < 21 < 6 10/10/19 - 10/10/19 < 8 < 8 < 16 < 12 < 23 < 11 < 18 < 13 < 11 < 9 < 36 < 14 MEAN BD-34 01/10/19 - 01/10/19 <7 < 8 < 12 < 7 < 14 < 8 < 12 < 11 < 7 < 6 < 36 < 7 04/11/19 - 04/11/19 < 7 < 8 < 16 < 8 < 15 < 8 < 13 < 12 < 8 < 7 < 41 < 9 07/11/19 - 07/11/19 <6 < 6 < 11 < 6 < 14 < 5 < 11 < 10 < 6 < 7 < 29 < 9 10/10/19 - 10/10/19 < 7 < 6 < 15 < 9 < 17 < 9 < 11 < 10 < 7 < 6 < 37 < 12 MEAN nI tO BD-35 01/10/19 - 01/10/19 < 6 < 6 < 12 < 8 < 14 < 8 < 11 < 11 < 8 < 8 < 35 < 11 04/11/19 - 04/11/19 < 7 < 6 < 14 < 8 < 15 < 6 < 13 < 12 < 7 < 8 < 35 < 5 07/11/19 - 07/11/19 < 4 < 5 < 11 < 4 < 10 < 6 < 10 < 8 < 6 < 5 < 24 < 7 10/10/19 - 10/10/19 < 7 < 7 < 16 < 8 < 14 < 9 < 11 < 11 < 7 < 8 < 37 < 12 MEAN BD-36 01/17/19 - 01/17/19 < 6 < 6 < 12 < 6 < 14 < 8 < 13 < 12 < 8 < 8 < 34 < 14 04/11 /19 - 04/11 /19 < 5 < 5 < 12 < 8 < 11 < 6 < 10 < 9 < 6 < 5 < 27 < 12 07/11/19 - 07/11/19 < 5 < 4 < 9 < 4 < 8 < 5 < 7 < 8 < 5 < 4 < 18 < 8 10/10/19 - 10/10/19 <7 < 8 < 16 < 8 < 13 < 9 < 15 < 9 < 8 < 7 < 31 < 13 MEAN BD-37 01/10/19 - 01 /10/19 < 5 <6 < 12 <7 < 11 < 5 < 11 < 9 < 6 < 6 < 26 < 10 04/11/19 - 04/11/19 < 8 < 8 < 18 < 9 < 17 < 8 < 14 < 14 < 9 < 7 < 38 < 10 07/11/19 - 07/11/19 < 6 < 5 < 11 < 5 < 12 < 5 < 9 < 8 < 6 < 6 < 25 < 9 10/10/19 - 10/10/19 < 6 <7 < 12 < 6 < 14 < 8 < 11 < 10 < 8 < 7 < 28 < 10 MEAN

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLE~

COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 jBa-140 La-140 BD-50 01/10/19 - 01/10/19 < 4 < 4 < 9 < 5 < 8 < 6 < 8 < 9 < 6 < 5 < 24 < 6 04/11 /19 - 04/11 /19 < 7 < 7 < 15 < 8 < 15 < 8 < 11 < 10 < 8 < 8 < 30 < 'IQ 07/11/19 - 07/11/19 < 4 < 5 < 9 < 5 < 10 < 5 < 9 < 7 < 5 < 5 < 18 < 6 10/10/19 - 10/10/19 < 9 < 7 < 18 < 8 < 17 < 9 < 15 < 11 < 9 < 8 < 35 < 9 MEAN BD-51 01/10/19 - 01/10/19 < 6 < 7 < 13 < 6 < 12 < 7 < 15 < 10 < 9 < 6 < 35 < *11 04/11/19 - 04/11/19 < 7 < 8 < 15 < 5 < 16 < 8 < 11 < 11 < 7 < 7 < 34 < 9 07/11/19 - 07/11/19 < 4 < 5 < 9 < 4 < 9 <4 < 8 < 7 < 5 <4 < 24 < 7 10/10/19 - 10/10/19 < 7 < 8 < 15 < 8 < 16 < 8 < 11 < 13 < 9 < 9 < 37 < 13 MEAN C)

I

...II.

0 BD-54 01 /10/19 - 01 /10/19 (1) 04/11 /19 - 04/11 /19 < 8 < 8 < 16 < 7 < 18 < 9 < 15 < 15 < 9 < 8 < 40 < 12 07/11/19 - 07/11/19 < 5 < 4 < 9 < 6 < 9 < 5 < 9 < 9 < 6 < 5 < 22 < 6 10/10/19 - 10/10/19 < 7 < 9 < 22 < 8 < 19 < 9 < 14 < 10 < 7 < 7 < 29 < 8 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION

Table C-IV.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 05/22/19 < 194 < 73 < 61 < 61 < 159 < 81 < 152 < 67 < 109 < 227 < 63 < 69 < 464 < 110 Golden Redhorse 05/22/19 < 243 < 58 < 35 < 45 < 139 < 53 < 128 < 62 < 87 < 126 < 61 < 56 < 350 < 87 Sma/lmouth Bass 10/17/19 < 240 < 123 < 24 < 24 < 58 < 26 < 48 < 21 < 40 < 32 < 22 < 23 < 111 < 37 Golden Redhorse 10/17/19 < 236 < 169 < 20 < 18 < 47 < 26 < 41 < 21 < 36 < 29 < 25 < 24 < 94 < 28 MEAN BD-28 Shorthead Redhorse 05/22/19 < 187 < 52 < 63 < 71 < 97 < 68 < 148 < 77 < 104 < 155 < 67 < 56 < 443 < 182 Quillback 05/22/19 < 68 < 70 < 64 < 81 < 104 < 51 < 117 < 72 < 95 < 195 < 57 < 61 < 380 < 169

(') Shorthead Redhorse 10/17/19 < 247 < 168 < 36 < 35 < 66 < 36 < 84 < 36 < 61 < 53 < 39 < 35 < 150 < 48 I

-lo. Smallmouth Bass 10/17/19 < 222 < 105 < 29 < 32 < 71 < 29 < 77 < 34 < 56 < 50 < 35 < 35 < 151 < 43

-lo.

MEAN BD-41 Common Carp 05/22/19 < 258 < 60 < 58 < 61 < 104 < 42 < 146 < 61 < 117 < 140 < 53 < 52 < 331 < 165 Largemouth Bass 05/22/19 < 255 < 52 < 58 < 55 < 100 < 77 < 83 < 48 < 81 < 178 < 47 < 60 < 454 < 103 Common Carp 10/15/19 < 112 < 131 < 24 < 26 < 50 < 27 < 56 < 24 < 41 < 32 < 29 < 26 < 116 < 44 Largemouth Bass 10/15/19 < 160 < 101 < 26 < 25 < 55 < 29 < 57 < 27 < 43 < 53 < 29 < 25 < 142 < 44 MEAN

I Table C-V.1 CONCENTRATIONS OF IRON-55, NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMP~ES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/KG DRY+/- 2 SIGMA COLLECTION SITE BD-10 PERIOD 05/29/19 Fe-55

< 1600 Ni-63

< 206 Mn-54

< 83 Co-58

< 73 Fe-59

< 262 Co-60

< 133 Zn-65

< 269 Nb-95

< 134 Zr-95

< 178 Cs-134

< 109 Cs-137;

< 130 Ba-140

< 666

-La-140

< 263 10/15/19 < 1211 < 157 < 68 < 78 < 196 < 114 < 188 < 82.7 < 148 < 90 < 94 < 351 < 100 MEAN BD-25 06/11/19 < 1935 < 210 < 51 < 56 < 133 < 51 < 126 < 61.8 < 104 < 66 < 67 < 289 < 95 10/15/19 < 1834 < 243 < 102 < 91 < 180 < 75 < 174 < 92.3 < 117 < 82 < 111 < 396 < 90 MEAN BD-57 05/29/19 < 1609 < 191 < 95 < 90 < 272 < 100 < 241 < 132 < 169 < 132 169 +/- 99 < 681 < 219 10/31/19 < 1897 < 214 < 112 < 90 < 203 < 112 < 223 < 109 < 171 < 98 < 132 < 443 < 148

(')

I MEAN+/- 2 STD DEV - - 169 +/- 0

~

f\)

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF E-3 PCl/CU METER+/- 2 SIGMA GROUP 111-COLLECTION GROUP I - NEAR FIELD GROUP II - FAR FIELD CONTROL PERIOD BD-06 BD-19 BD-20 BD-21 BD-02 BD-04 BD-05 BD-03 12/27/18 - 01/03/19 15 +/- 4 13 +/- 4 13 +/-4 12 +/- 4 12 +/- 4 13 +/- 4 14 +/- 4 16 +/- 4 01/03/19 - 01/10/19 22 +/- 5 21 +/- 4 23 +/-5 27 +/- 5 23 +/- 5 22 +/- 5 24 +/-5 25 +/- 5 01/10/19 - 01/17/19 17 +/- 4 16 +/- 4 14 +/-4 17 +/- 4 13 +/- 4 15 +/- 4 15 +/-4 13 +/- 4 01/17/19 - 01/24/19 13 +/- 4 14 +/- 4 17 +/- 4 18 +/- 4 12 +/- 4 20 +/- 4 21 +/-4 15 +/- 4 01/24/19 - 02/01/19 23 +/- 4 24 +/- 4 21 +/-4 19 +/- 3 26 +/- 4 27 +/- 5 23 +/-4 22 +/- 4 02/01/19 - 02/07/19 15 +/- 5 12 +/- 4 16 +/-5 (1) 15 +/- 5 12 +/- 4 16 +/- 5 12 +/- 4 02107 /19 - 02/14/19 12 +/- 4 14 +/- 4 13 +/-4 17 +/- 4 10 +/- 3 12 +/- 4 14 +/-4 13 +/- 4 02/14/19 - 02/21/19 14 +/- 4 17 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 15 +/- 4 13 +/- 4 13 +/- 4 02/21/19 - 02/28/19 26 +/- 5 26 +/- 5 21 +/- 4 26 +/- 5 21 +/- 5 22 +/- 4 25 +/- 5 23 +/- 5 02/28/19 - 03/07/19 21 +/- 4 21 +/- 4 18 +/-4 19 +/- 4 22 +/- 5 20 +/- 4 17 +/- 4 18 +/- 4 03/07/19 - 03/14/19 17 +/- 4 18 +/- 4 18 +/-4 17 +/- 4 15 +/- 4 16 +/- 4 17 +/-4 17 +/- 4 03/14/19 - 03/21/19 16 +/- 4 14 +/- 4 19 +/- 4 16 +/- 4 13 +/- 4 14 +/- 4 15 +/-4 15 +/- 4 03/21/19 - 03/28/19 11 +/- 3 12 +/- 4 12 +/- 4 12 +/- 4 11 +/- 4 11 +/- 3 10 +/-3 13 +/- 4 03/28/19 - 04/04/19 14 +/- 4 11 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 13 +/- 4 04/04/19 - 04/11 /19 7 +/- 4 6 +/- 3 7 +/- 4 8 +/- 4 7 +/- 4 7 +/- 4 6 +/-3 11 +/- 4 04/11 /19 - 04/18/19 13 +/- 4 11 +/- 3 10 +/- 3 11 +/- 3 12 +/- 4 11 +/- 3 10 +/- 3 10 +/- 4 04/18/19 - 04/25/19 10 +/- 4 10 +/- 4 11 +/-4 10 +/- 4 12 +/- 4 10 +/- 4 11 +/-4 10 +/- 4 04/25/19 - 05/02/19 7 +/- 3 10 +/- 4 10 +/- 3 10 +/- 3 8 +/- 4 11 +/- 4 11 +/- 4 11 +/- 4 05/02/19 - 05/09/19 12 +/- 4 14 +/- 4 10 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 10 +/- 4 12 +/- 4 05/09/19 - 05/16/19 13 +/- 4 12 +/- 4 14 +/- 4 11 +/- 4 14 +/- 4 15 +/- 4 9 +/- 4 14 +/-4 05/16/19 - 05/23/19 5 +/- 3 5 +/- 3 8 +/-3 8 +/- 3 7 +/- 3 7 +/-3 9 +/- 3 8 +/-4 05/23/19 - 05/30/19 9 +/- 3 7 +/- 3 10 +/- 3 11 +/- 4 10 +/- 4 8 +/- 3 9 +/- 3 7 +/- 3 05/30/19 - 06/06/19 13 +/- 4 12 +/- 3 15 +/- 4 14 +/-4 15 +/- 4 15 +/- 4 12 +/- 4 11 +/- 4 06/06/19 - 06/13/19 12 +/- 4 10 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 14 +/- 4 13 +/- 4 14 +/- 4 06/13/19 - 06/20/19 8 +/- 4 9 +/- 4 9 +/- 4 10 +/- 4 11 +/- 4 9 +/- 4 11 +/-4 11 +/- 4 06/20/19 - 06/27/19 18 +/- 4 14 +/- 4 16 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 15 +/- 4 06/27/19 - 07/03/19 19 +/- 5 15 +/- 5 17 +/-5 20 +/- 5 18 +/- 5 20 +/- 5 20 +/- 5 21 +/- 5 07/03/19 - 07/11 /19 12 +/- 3 13 +/- 3 12 +/-3 9 +/- 3 6 +/- 3 9 +/- 3 11 +/- 3 10 +/- 3 07/11 /19 - 07/18/19 16 +/- 4 12 +/- 4 12 +/- 4 16 +/- 4 27 +/- 8 14 +/- 4 16 +/- 4 13 +/- 4 07/18/19 - 07/25/19 11 +/- 4 11 +/- 4 9 +/- 3 10 +/- 4 11 +/- 3 12 +/- 4 10 +/-3 12 +/- 4 07/25/19 - 08/01 /19 16 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 13 +/- 4 18 +/- 4 16 +/- 4 19 +/- 4 08/01 /19 - 08/08/19 14 +/- 4 12 +/- 3 14 +/- 4 14 +/- 4 15 +/- 4 18 +/- 4 12 +/-3 13 +/- 4 08/08/19 - 08/15/19 17 +/- 4 20 +/- 4 18 +/- 4 21 +/-4 20 +/- 4 17 +/- 4 20 +/- 4 15 +/-4 08/15/19 - 08/22/19 16 +/- 4 15 +/-4 16 +/- 4 16 +/-4 15 +/- 4 12 +/- 4 14 +/- 4 16 +/-4 08/22/19 - 08/29/19 15 +/- 4 9 +/- 4 15 +/- 4 13 +/- 4 14 +/- 4 13 +/- 4 12 +/- 4 14 +/-4 08/29/19 - 09/05/19 18 +/- 4 16 +/- 4 18 +/-4 16 +/- 4 15 +/- 4 19 +/- 4 17 +/- 4 14 +/- 4 09/05/19 - 09/12/19 21 +/- 4 20 +/- 4 17 +/-4 20 +/- 4 21 +/-4 17 +/- 4 21 +/- 4 22 +/- 4 09/12/19 - 09/19/19 23 +/- 5 27 +/- 5 28 +/-5 22 +/- 5 20 +/- 4 27 +/- 5 25 +/- 5 26 +/- 5 09/19/19 - 09/26/19 19 +/- 4 19 +/- 4 19 +/- 4 18 +/- 4 16 +/-4 21 +/- 5 24 +/- 5 20 +/- 5 09/26/19 - 10/03/19 9 +/- 4 13 +/- 4 10 +/-4 12 +/- 4 13 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 10/03/19 - 10/10/19 13 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 12 +/- 4 13 +/- 4 16 +/-4 16 +/- 4 10/10/19 - 10/17/19 14 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 12 +/- 4 13 +/- 4 14 +/- 4 17 +/- 4 10/17/19 - 10/23/19 19 +/- 5 20 +/- 5 17 +/- 5 16 +/-5 16 +/-5 15 +/-5 18 +/-5 20 +/- 5 10/23/19 - 10/31/19 11 +/- 3 11 +/- 3 9 +/- 3 11 +/- 3 12 +/- 3 11 +/- 4 12 +/-3 11 +/- 4 10/31/19 - 11/07/19 16 +/- 4 11 +/-4 12 +/-4 14 +/- 4 10 +/- 4 12 +/- 4 13 +/- 4 9 +/- 4 11/07/19 - 11/14/19 17 +/- 4 17 +/- 4 18 +/-4 18 +/- 4 18 +/- 4 16 +/- 4 18 +/- 4 18 +/- 4 11/14/19 - 11/21/19 25 +/- 5 22 +/- 4 25 +/- 5 26 +/-5 25 +/- 5 27 +/- 5 25 +/- 5 24 +/- 5 11/21/19 - 11/29/19 16 +/-4 15 +/- 3 13 +/- 3 12 +/- 3 12 +/- 3 12 +/- 3 14 +/- 4 12 +/- 3 11 /29/19 - 12/06/19 8 +/-4 14 +/- 4 10 +/- 4 14 +/-4 11 +/- 4 11 +/- 4 9 +/-4 10 +/- 4 12/06/19 - 12/12/19 22 +/- 5 28 +/-6 26 +/- 5 20 +/- 5 24 +/- 5 20 +/- 5 21 +/- 5 18 +/- 5 12/12/19 - 12/19/19 24 +/- 5 25 +/- 5 26 +/- 5 24 +/- 5 28 +/- 5 27 +/- 5 27 +/- 5 29 +/- 5 12/19/19 - 12/26/19 24 +/- 5 24 +/- 5 27 +/-5 30 +/- 5 25 +/- 5 29 +/- 5 26 +/-5 27 +/- 5 MEAN+/- 2 STD DEV 15 +/- 10 15 +/- 11 15 +/- 10 16 +/- 10 15 +/- 11 15 +/- 11 15 +/- 11 15 +/- 10 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-13

Table C-Vl.2 MONTHLY AND YEARLY VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF E-3 PCl/CU METER+/- 2 SIGMA GROUP I - NEAR FIELD LOCATIONS GROUP II - FAR FIELD LOCATIONS GROUP Ill - CONTROL UOCATIONS t

COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN IMAX MEAN PERIOD +/-2SD PERIOD +/-2SD PERIOD +/-2SD 12/27/18 - 02/07/19 12 27 18 +/- 9 12/27/18 - 02/01/19 12 27 19 +/- 11 12/27/18 - 02/01/19 13 i 25 18 +/- 10 02/01/19 - 02/28/19 12 26 17 +/- 10 02/01/19 - 02/28/19 10 25 16 +/- 9 02/01 /19 - 02/28/19 12 i 23 16 +/- 10 02/28/19 - 03/28/19 11 21 16 +/- 7 02/28/19 - 03/28/19 10 22 15 +/- 7 02/28/19 - 03/28/19 13 i 18 16 +/- 4 03/28/19 - 05/02/19 6 14 10 +/- 4 03/28/19 - 05/02/19 6 14 10 +/- 4 03/28/19 - 05/02/19 10 13 11 +/- 2 05/02/19 - 05/30/19 5 14 10 +/- 5 05/02/19 - 05/30/19 7 15 10 +/- 5 05/02/19 - 05/30/19 7 14 10 +/- 6 05/30/19 - 06/27/19 8 18 13 +/- 5 05/30/19 - 06/27/19 9 16 13 +/- 4 05/30/19 - 06/27 /19 11 15 13 +/- 4 06/27/19 - 08/01/19 9 20 14 +/- 7 06/27/19 - 08/01/19 6 27 15 +/- 10 06/27/19 - 08/01/19 10 21 15 +/- 10 08/01 /19 - 08/29/19 9 21 15 +/- 6 08/01/19 - 08/29/19 12 20 15 +/- 6 08/01 /19 - 08/29/19 13 16 14 +/- 3 08/29/19 - 09/26/19 16 28 20 +/- 7 08/29/19 - 09/26/19 15 27 20 +/- 7 08/29/19 - 09/26/19 14

26 20 +/- 10 09/26/19 - 10/31/19 9 20 13 +/- 6 09/26/19 - 10/31/19 11 18 14 +/- 4 09/26/19 - 10/31/19 11 20 15 +/- 8 10/31/19 - 11/29/19 11 26 17 +/- 9 10/31/19 - 11/29/19 10 27 17 +/- 12 10/31/19 - 11/29/19 9 . 24 16 +/- 13

(')

~

I 11 /29/19 - 12/26/19 8 30 22 +/- 13 11 /29/19 - 12/26/19 9 29 22 +/- 14 11/29/19 - 12/26/19 10 29 21 +/- 18

.i::.

12/27/18 - 12/26/19 5 30 15 +/- 10 12/27/18 - 12/26/19 6 29 15 +/- 11 12/27/18 - 12/26/19 7

29 15 +/- 10 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, 2019 RESULTS IN UNITS OF E-3 PCl/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 12/27/18 - 03/28/19 < 2 < 2 < 5 < 1 < 5 < 2 < 3 < 2 < 2 < 12 < 5 03/28/19 - 06/27/19 < 2 < 4 < 8 <4 < 7 < 3 < 7 < 3 < 3 < 36 < 11 06/27/19 - 09/26/19 < 2 < 3 < 6 < 3 < 6 < 3 < 5 < 3 < 2 < 23 < 8 09/26/19 - 12/26/19 < 3 < 3 < 5 < 3 < 5 < 3 < 3 < 2 < 2 < 19 < 10 MEAN BD-03 12/27/18 - 03/28/19 < 2 < 2 < 5 < 3 < 3 < 3 < 4 < 3 < 2 < 11 < 8 03/28/19 - 06/27/19 < 3 < 3 < 7 < 2 < 7 < 3 < 6 < 3 < 2 < 33 < 13 06/27/19 - 09/26/19 < 2 < 2 < 5 < 2 < 5 < 3 < 3 < 2 < 2 < 17 < 11 09/26/19 - 12/26/19 < 2 < 2 < 4 < 2 <4 < 2 < 3 < 2 < 2 < 14 < 6 MEAN

(')

I

...a.

CTI BD-04 12/27/18 - 03/28/19 < 2 < 3 < 6 < 3 < 6 < 3 < 4 < 2 < 2 < 14 < 6 03/28/19 - 06/27/19 < 2 < 2 < 7 < 2 < 6 < 3 <4 < 2 < 2 < 27 < 8 06/27/19 - 09/26/19 < 3 < 3 < 5 < 3 < 6 < 3 < 5 < 3 < 2 < 24 < 8 09/26/19 - 12/26/19 < 2 < 3 < 5 < 2 < 5 < 3 < 3 < 2 < 2 < 14 < 8 MEAN BD-05 12/27/18 - 03/28/19 < 3 < 2 < 5 < 3 < 7 < 3 < 4 < 3 < 3 < 17 < 6 03/28/19 - 06/27/19 < 3 < 2 < 6 < 2 < 8 < 3 < 5 < 2 < 3 < 27 < 14 06/27/19 - 09/26/19 < 2 < 2 < 5 < 2 < 4 < 2 < 5 < 2 < 2 < 15 < 11 09/26/19 - 12/26/19 < 2 < 3 < 6 < 3 < 5 < 2 < 4 < 2 < 1 < 19 < 5 MEAN BD-06 12/27/18 - 03/28/19 < 2 < 2 < 4 < 2 < 4 < 2 <4 < 2 < 2 < 12 < 3 03/28/19 - 06/27/19 < 3 < 2 < 5 < 2 < 5 < 3 < 4 < 3 < 2 < 32 < 8 06127 /19 - 09/26/19 < 3 < 3 < 6 < 2 < 7 < 3 < 5 < 3 < 2 < 21 < 9 09/26/19 - 12/26/19 < 1 < 2 < 4 < 2 < 3 < 2 < 3 < 2 < 1 < 14 < 8 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF E-3 PCl/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 12/27/18 - 03/28/19 < 2 < 2 < 5 < 3 <4 < 2 < 4 < 2 < 2 < 11 < 5 03/28/19 - 06/27/19 < 3 < 4 < 9 <4 < 9 < 3 < 5 < 3 < 3 < 43 < 17 06/27/19 - 09/26/19 < 2 < 2 < 4 < 2 < 6 < 3 < 3 < 2 < 2 < 16 < 6 09/26/19 - 12/26/19 < 2 < 2 < 4 < 2 < 5 < 2 < 4 < 2 < 2 < 17 < 6 MEAN BD-20 12/27/18 - 03/28/19 < 2 < 2 < 4 < 2 < 6 < 2 <4 < 2 < 2 < 13 < 6 03/28/19 - 06127 /19 < 3 < 3 < 10 <4 < 10 <4 < 6 <4 < 3 < 48 < 8 06/27/19 - 09/26/19 < 2 < 2 <4 < 2 < 5 < 2 < 4 < 2 < 2 < 14 < 3 09/26/19 - 12/26/19 < 1 < 3 < 3 < 2 < 5 < 2 < 4 < 2 < 2 < 15 <4 MEAN

(")

I

~

en BD-21 12/27/18 - 03/28/19 < 3 < 3 < 7 < 4 < 6 < 3 < 5 < 4 < 3 < 18 < 7 03/28/19 - 06/27/19 < 2 < 3 < 3 < 2 < 7 < 3 < 4 < 2 < 2 < 32 < 13 06/27/19 - 09/26/19 < 2 < 1 < 7 < 3 <4 < 2 < 3 < 2 < 2 < 11 < 7 09/26/19 - 12/26/19 < 3 < 3 < 6 < 3 <4 < 3 < 5 < 3 < 3 < 23 < 7 MEAN

Table C-Vll.1 CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF E-3 PCl/CU METER+/- 2 SIGMA GROUP 111-COLLECTION GROUP I - NEAR FIELD GROUP II - FAR FIELD CONTROL PERIOD BD-06 BD-19 BD-20 BD-21 BD-02 BD-04 BD-05 BD-03 12/27/18 - 01/03/19 < 58 < 57 < 60 < 61 < 46 < 44 < 44 < 44 01 /03/19 - 01/10/19 < 53 < 50 < 53 < 56 < 58 < 56 < 59 < 58 01/10/19 - 01/17/19 < 47 < 46 < 48 < 50 < 37 < 36 < 37 < 36 01/17/19 - 01/24/19 < 45 < 44 < 45 < 46 < 40 < 39 < 39 < 16 01/24/19 - 02/01/19 < 40 < 39 < 40 < 18 < 38 < 51 < 38 < 38 02/01/19 - 02/07/19 < 46 < 45 < 47 (1) < 55 < 50 < 56 < 53 02/07/19 - 02/14/19 < 43 < 43 < 42 < 43 < 54 < 56 < 54 < 53 02/14/19 - 02/21/19 < 42 < 42 < 43 < 44 < 43 < 43 < 43 < 43 02/21/19 - 02/28/19 < 33 < 32 < 33 < 34 < 44 < 42 < 42 < 44 02/28/19 - 03/07/19 < 37 < 36 < 32 < 40 < 61 < 57 < 62 < 61 03/07/19 - 03/14/19 < 55 < 22 < 55 < 57 < 33 < 33 < 33 < 33 03/14/19 - 03/21/19 < 41 < 41 < 44 < 44 < 34 < 32 < 33 < 33 03/21/19 - 03/28/19 < 55 < 53 < 55 < 55 < 34 < 31 < 33 < 33 03/28/19 - 04/04/19 < 39 < 39 < 40 < 40 < 26 < 25 < 25 < 26 04/04/19 - 04/11/19 < 42 < 42 < 42 < 42 < 31 < 30 < 28 < 31 04/11 /19 - 04/18/19 < 43 < 42 < 44 < 44 < 35 < 33 < 33 < 34 04/18/19 - 04/25/19 < 39 < 37 < 15 < 38 < 42 < 40 < 39 < 43 04/25/19 - 05/02/19 < 41 < 45 < 43 < 43 < 29 < 26 < 28 < 28 05/02/19 - 05/09/19 < 25 < 25 < 25 < 24 < 21 < 20 < 20 < 21 05/09/19 - 05/16/19 < 24 < 24 < 23 < 23 < 46 < 44 < 46 < 46 05/16/19 - 05/23/19 < 24 < 40 < 39 < 40 < 29 < 29 < 29 < 30 05/23/19 - 05/30/19 < 51 < 51 < 52 < 52 < 32 < 30 < 30 < 30 05/30/19 - 06/06/19 < 48 < 48 < 48 < 48 < 35 < 30 < 33 < 33 06/06/19 - 06/13/19 < 30 < 30 < 31 < 13 < 38 < 38 < 36 < 38 06/13/19 - 06/20/19 < 52 < 52 < 52 < 52 < 33 < 31 < 31 < 31 06/20/19 - 06/27/19 < 46 < 45 < 46 < 45 < 28 < 29 < 28 < 30 06/27/19 - 07/03/19 < 58 < 56 < 55 < 56 < 34 < 30 < 33 < 34 07/03/19 - 07/11/19 < 46 < 45 < 46 < 46 < 23 < 23 < 22 < 24 07/11/19 - 07/18/19 < 48 < 48 < 48 < 48 < 48 < 32 < 31 < 32 07/18/19 - 07/25/19 < 50 < 50 < 50 < 50 < 53 < 56 < 54 < 57 07/25/19 - 08/01/19 < 44 < 44 < 18 < 44 < 37 < 34 < 37 < 37 08/01/19 - 08/08/19 < 42 < 41 < 42 < 41 < 43 < 45 < 42 < 44 08/08/19 - 08/15/19 < 43 < 43 < 43 < 43 < 33 < 32 < 31 < 33 08/15/19 - 08/22/19 < 44 < 44 < 44 < 45 < 31 < 29 < 30 < 30 08/22/19 - 08/29/19 < 49 < 49 < 48 < 48 < 24 < 24 < 24 < 25 08/29/19 - 09/05/19 < 44 < 43 < 43 < 44 < 55 < 49 < 52 < 55 09/05/19 - 09/12/19 < 30 < 30 < 30 < 13 < 25 < 27 < 27 < 27 09/12/19 - 09/19/19 < 33 < 33 < 18 < 33 < 34 < 34 < 33 < 34 09/19/19 - 09/26/19 < 34 < 34 < 34 < 34 < 26 < 27 < 21 < 26 09/26/19 - 10/03/19 < 29 < 23 < 28 < 28 < 43 < 41 < 42 < 42 10/03/19 - 10/10/19 < 45 < 43 < 18 < 43 < 34 < 37 < 35 < 35 10/10/19 - 10/17/19 < 42 < 17 < 41 < 40 < 24 < 26 < 24 < 25 10/17/19 - 10/23/19 < 30 < 29 < 29 < 29 < 30 < 33 < 29 < 31 10/23/19 - 10/31/19 < 44 < 42 < 41 < 42 < 27 < 30 < 27 < 29 10/31/19 - 11/07/19 < 28 < 21 < 27 < 27 < 31 < 32 < 32 < 33 11/07/19 - 11/14/19 < 32 < 31 < 31 < 26 < 28 < 31 < 28 < 30 11/14/19 - 11/21/19 < 27 < 26 < 26 < 26 < 26 < 27 < 26 < 26 11/21/19 - 11/29/19 < 35 < 33 < 33 < 34 < 37 < 39 < 39 < 39 11 /29/19 - 12/06/19 < 40 < 38 < 39 < 16 < 22 < 22 < 22 < 22 12/06/19 - 12/12/19 < 33 < 32 < 32 < 32 < 24 < 26 < 24 < 24 12/12/19 - 12/19/19 < 44 < 41 < 41 < 42 < 46 < 47 < 45 < 45 12/19/19 - 12/26/19 < 34 < 32 < 33 < 28 < 35 < 30 < 35 < 35 MEAN (1) SEE PROGRAM EXCEPTIONS FOR EXPLANATION C-17

Table C-Vlll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA

. .g()L!,E:C::!IQf':l. ~.C::QJ'.JT~gL_fARM . .

PERIOD BD-18 01/03/19 < 0.5 02/06/19 < 0.9 03/06/19 < 0.8 04/04/19 < 0.7 05/01/19 < 0.8 05/16/19 < 0.4 05/30/19 < 0.8 06/13/19 < 0.9 06/26/19 < 0.9 07/10/19 < 0.8 07/24/19 < 0.5 08/08/19 < 0.8 08/22/19 < 0.5 09/04/19 < 0.9 09/19/19 (1) 10/03/19 (1) 10/17/09 (1) 10/31119 (1) 11114119 (1) 12105119 < 0.6 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, 2019 RES ULTS IN UNITS OF PC I/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 01/03/19 < 7 < 8 < 16 < 8 < 17 < 8 < 9 < 7 < 7 < 35 < 8 02/06/19 < 7 <7 < 14 < 8 < 18 < 8 < 14 < 9 < 8 < 37 < 9 03/06/19 < 5 < 6 < 13 < 6 < 11 < 5 < 10 < 6 < 6 < 20 < 7 04/04/19 < 8 < 9 < 21 < 9 < 14 < 9 < 14 < 9 < 8 < 37 < 11 05/01/19 < 6 <6 < 14 < 5 < 14 < 7 < 11 < 6 < 6 < 32 < 8 05/16/19 < 8 < 9 < 18 < 11 < 17 < 8 < 14 < 9 < 8 < 40 < 10 05/30/19 < 8 < 8 < 15 < 10 < 17 < 9 < 12 < 7 < 8 < 37 < 12 06/13/19 < 5 < 5 < 13 < 7 < 13 < 6 < 10 < 6 < 6 < 24 < 6 06/26/19 < 7 < 8 < 13 < 7 < 17 < 8 < 11 < 8 < 8 < 35 < 13 07/10/19 < 8 < 9 < 16 < 9 < 19 < 8 < 14 < 7 < 8 < 43 < 7 07/24/19 < 8 < 7 < 19 < 7 < 20 < 7 < 14 < 8 < 7 < 30 < 9 08/08/19 < 10 < 8 < 19 < 9 < 16 < 8 < 14 < 10 < 9 < 37 < 9 08/22/19 < 8 < 8 < 13 < 9 < 19 < 7 < 14 < 10 < 9 < 33 < 13 09/04/19 < 8 < 9 < 21 < 10 < 18 < 8 < 13 < 9 < 9 < 36 < 11 C')

I 09/19/19 (1)

-I.

<O 10/03/19 (1) 10/17/09 (1) 10/31/19 (1) 11/14/19 (1) 12/05/19 < 9 < 10 < 24 < 12 < 20 < 9 < 17 < 9 <9 < 39 < 14 MEAN Table C-Vlll.3 CONCENTRATIONS OF GAMMA EMITTERS IN GRASS SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RES ULTS IN UNITS OF PCl/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 2019 (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, 2019 RESULTS IN UNITS OF PCl/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-13f Ba-140 La-14C BO-CONTROL Burdock Leaves 05116/19 < 17 < 17 < 35 < 18 < 37 < 17 < 29 < 25 < 19 < 18 < 79 < 23 Carrot Leaves 08/01/19 < 53 < 50 < 104 < 52 < 107 < 53 < 91 < 77 < 56 < 54 < 236 < 70 Radishes 08/01/19 < 26 < 27 < 52 < 27 < 52 < 29 < 44 < 43 < 27 < 26 < 111 < 41 Radishes 08/29/19 < 18 < 19 < 43 < 20 < 44 < 21 < 34 < 35 < 20 < 20 < 101 < 29 MEAN BO-QUAD 2 Green Onions 07/03/19 < 27 < 27 < 50 < 26 < 54 < 27 < 48 < 50 < 28 < 27 < 137 < 41 Lettuce 07/03/19 < 32 < 31 < 63 < 33 < 71 < 34 < 54 < 56 < 37 < 36 < 164 < 50 Leeks 07/03/19 < 25 < 26 < 54 < 28 < 55 < 32 < 38 < 46 < 29 < 27 < 121 < 36 Cabbage 08/29/19 < 25 < 23 < 62 < 34 < 69 < 30 < 54 < 43 < 28 < 33 < 158 < 47 Onion 08/29/19 < 34 < 37 < 71 < 38 < 73 < 37 < 56 < 56 < 29 < 41 < 149 < 53 Potatoes 08/29/19 < 19 < 17 < 39 < 18 < 40 < 19 < 32 < 29 < 20 < 20 < 86 < 23 Cabbage 09/12/19 < 25 < 28 < 62 < 32 < 78 < 29 < 41 < 40 < 37 < 25 < 112 < 29 Potatoes 09/12/19 < 13 < 13 < 27 < 13 < 29 < 14 < 22 < 18 < 15 < 15 < 58 < 17

(")

I MEAN I\)

0 BO-QUAD 3 Cabbage 07/25/19 < 31 < 28 < 64 < 31 < 69 < 33 < 65 < 53 < 36 < 27 < 183 < 55 MEAN BD-QUAD4 Beets/Beet Leaves 08/01/19 < 31 < 32 < 84 < 28 < 67 < 41 < 68 < 54 < 38 < 38 < 130 < 43 Red Beets 08/29/19 < 19 < 18 < 41 < 20 < 42 < 21 < 34 < 34 < 19 < 20 < 93 < 27 MEAN BWD-G1 Kale 06/27/19 < 26 < 25 < 52 < 29 < 58 < 26 < 46 < 39 < 30 < 28 < 117 < 36 Cabbage 06/27/19 < 30 < 28 < 50 < 32 < 54 < 32 < 50 < 36 < 31 < 22 < 139 < 38 Swiss Chard 06/27/19 < 17 < 16 < 34 < 15 < 37 < 16 < 27 < 26 < 17 < 17 < 74 < 25 Kale 07/11/19 < 38 < 32 < 81 < 35 < 71 < 42 < 62 < 56 < 42 < 32 < 173 < 46 Cabbage 07/11/19 < 31 < 41 < 91 < 50 < 84 < 52 < 63 < 58 < 38 < 40 < 206 < 65 Kohlrabi 07/11/19 < 15 < 14 < 27 < 13 < 30 < 15 < 25 < 28 < 16 < 16 < 75 < 19 Cabbage 07/25/19 < 32 < 32 < 53 < 33 < 68 < 30 < 58 < 54 < 35 < 29 < 166 < 33 Kale 07/25/19 < 24 < 26 < 53 < 32 < 66 < 34 < 52 < 51 < 35 < 35 < 157 < 41 Turnip Greens 07/25/19 < 27 < 26 < 54 < 24 < 53 < 28 < 46 < 49 < 29 < 29 < 131 < 35 Cabbage 08/08/19 < 33 < 32 < 75 < 34 < 88 < 43 < 61 < 59 < 47 < 35 < 162 < 48 Kale 08/08/19 < 26 < 25 < 52 < 25 < 49 < 31 < 48 < 38 < 30 < 30 < 127 < 37 Pink Kale 08/08/19 < 16 < 16 < 37 < 20 < 37 < 18 < 29 < 25 < 18 < 18 < 75 < 26 Kale 08/22/19 < 42 < 39 < 62 < 48 < 81 < 44 < 76 < 43 < 50 < 43 < 168 < 53

Table C-IX.1 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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-14(

BWD-G1 (cont'd)

Cabbage 08122/19 < 39 < 36 < 72 < 32 < 74 < 33 < 60 < 57 < 34 < 45 < 156 < 56 Swiss Chard 08/22/19 < 28 < 30 < 75 < 33 < 77 < 44 < 49 < 50 < 39 < 41 < 146 < 47 Kale 09/05/19 < 37 < 30 < 75 < 35 < 72 < 34 < 57 < 50 < 36 < 37 < 146 < 61 Pink Kale 09/05/19 < 39 < 40 < 78 < 42 < 96 < 38 < 56 < 54 < 37 < 40 < 207 < 74 Cabbage 09/05/19 < 35 < 42 < 80 < 43 < 92 < 45 < 66 < 51 < 35 < 38 < 169 < 46 Cabbage 09/19/19 < 17 < 14 < 28 < 18 < 27 < 17 < 29 < 23 < 17 < 17 < 64 < 18 Kale 09/19/19 < 43 < 36 < 86 < 48 < 87 < 48 < 80 < 57 < 45 < 41 < 181 < 68 Pink Kale 09/19/19 < 37 < 31 < 75 < 38 < 84 < 43 < 68 < 51 < 43 < 41 < 165 < 46 Cabbage 10/03/19 < 20 < 18 < 51 < 21 < 43 < 26 < 32 < 32 < 31 < 28 < 102 < 28 Kale 10/03/19 < 27 < 32 < 75 < 35 < 82 < 37 < 57 < 51 < 36 < 37 < 140 < 32 Pink Kale 10/03/19 < 37 < 28 < 76 < 45 < 78 < 35 < 63 < 58 < 33 < 40 < 168 < 46 Cabbage 10/17/19 < 22 < 25 < 60 < 32 < 64 < 39 < 48 < 51 < 24 < 25 < 123 < 38 Kale 10/17/19 < 39 < 34 < 77 < 45 < 77 < 41 < 66 < 56 < 45 < 43 < 187 < 55 Pink Kale 10/17/19 < 33 < 29 < 65 < 32 < 66 < 38 < 66 < 51 < 39 < 39 < 131 < 37 Cabbage 10/31/19 < 26 < 24 < 52 < 29 < 52 < 26 < 47 < 40 < 26 < 27 < 114 < 36 Kale 10/31/19 < 40 < 37 < 92 < 44 < 78 < 43 < 68 < 53 < 43 < 40 < 157 < 60

(".) Pink Kale 10/31/19 < 28 < 28 < 54 < 22 < 51 < 36 < 47 < 49 < 31 < 33 < 129 < 32 I

I\:)

..... MEAN BWD-G2 Field Grass 05/16/19 < 22 < 21 < 46 < 26 < 49 < 24 < 38 < 33 < 24 < 23 < 98 < 28 Cabbage 08/08/19 < 34 < 42 < 82 < 53 < 84 < 39 < 74 < 56 < 45 < 43 < 142 < 48 Pink Kale 08/08/19 < 26 < 27 < 57 < 29 < 52 < 27 < 47 < 47 < 30 < 30 < 129 < 37 Cabbage 08/22/19 < 36 < 31 < 86 < 45 < 27 < 44 < 58 < 54 < 50 < 32 < 162 < 56 Red Kale 08/22/19 < 31 < 29 < 49 < 28 < 74 < 29 < 54 < 54 < 37 < 34 < 167 < 41 Kale 08/22/19 < 36 < 25 < 74 < 35 < 80 < 24 < 68 < 51 < 40 < 38 < 126 < 46 Cabbage 09/05/19 < 41 < 38 < 85 < 46 < 111 < 46 < 83 < 56 < 49 < 45 < 187 < 49 Red beets 09/05/19 < 28 < 25 < 68 < 21 < 66 < 31 < 65 < 48 < 38 < 39 < 142 < 41 Kohlrabi 09/05/19 < 39 < 37 < 67 < 35 < 63 < 23 < 22 < 50 < 36 < 36 < 157 < 10 Cabbage 09/19/19 < 37 < 32 < 75 < 37 < 80 < 42 < 49 < 51 < 36 < 32 < 142 < 32 Kohlrabi 09/19/19 < 29 < 30 < 58 < 36 < 44 < 30 < 48 < 47 < 29 < 29 < 140 < 41 Red Beets 09/19/19 < 15 < 15 < 31 < 16 < 34 < 15 < 24 < 20 < 15 < 16 < 64 < 20 Cabbage 10/03/19 < 30 < 21 < 52 < 34 < 57 < 26 < 45 < 37 < 32 < 28 < 139 < 41 Kohlrabi 10/03/19 < 29 < 28 < 67 < 39 < 53 < 27 < 50 < 48 < 19 < 30 < 150 < 34 Red kale 10/03/19 < 34 < 29 < 56 < 30 < 64 < 32 < 49 < 47 < 30 < 31 < 136 < 39 Cabbage 10/17/19 < 22 < 21 < 43 < 24 < 50 < 22 < 32 < 33 < 26 < 24 < 92 < 26 Kohlrabi 10/17/19 < 22 < 21 < 47 < 22 < 38 < 23 < 37 < 29 < 24 < 22 < 88 < 22 Red Kale 10/17/19 < 21 < 18 < 40 < 21 < 39 < 19 < 35 < 28 < 22 < 19 < 87 < 25 Cabbage 10/31/19 < 26 < 27 < 55 < 27 < 68 < 30 < 47 < 42 < 30 < 28 < 123 < 29 Kohlrabi 10/31/19 < 39 < 32 < 65 < 35 < 70 < 43 < 68 < 54 < 39 < 38 < 122 < 38 Kale 10/31/19 < 39 < 34 < 68 < 37 < 94 < 41 < 56 < 54 < 41 < 40 < 181 < 33 MEAN

Table C-X.1 QUARTERLY OSLO RESULTS FOR BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS Location Bu+ 2019 Normalized Net Dose, Quarterly Facility Dose, Fu Annual BA t Normalized Annual Monitoring Quarterly

~~019 Location Baseline, BQ MD Du MQx (mrem/std. Qtr.) (mrem) Baseline, BA (mrem)

MDDA Annual Dose, MA (mrem/yr)

Facility Dose, FA (mrem) (mrer;n)

(mrem) 1 I 2 I 3 I 4 1 I 2 I 3 I 4 Control BD-03 9.60 16.86 15.0 14.7 15.6 15.0 ND ND ND ND 38.60 60.3~ 60.35 ND Ind - Far BD-02 9.40 16.66 14.7 15.8 14.6 14.9 ND ND ND ND 37.40 59.1'8 60.03 22.63 BD-04 8.50 15.76 13.8 14.9 15.1 14.3 ND ND ND ND 34.10 55.8a 58.11 24.01 BD-05 9.60 16.86 15.8 16.1 16.4 15.8 ND ND ND ND 38.30 60.08 64.15 25.85 Ind - Inner BD-101 9.10 16.36 14.5 14.9 14.7 14.7 ND ND ND ND 36.60 58.3~ 58.79 22.19 BD-102 9.00 16.26 13.3 12.6 12.5 13.2 ND ND ND ND 36.10 57.8,8 51.61 ND BD-103 9.00 16.26 14.7 13.9 14.1 14.1 ND ND ND ND 35.90 57.68 56.83 ND BD-104 8.00 15.26 13.3 13.2 13.5 13.3 ND ND ND ND 32.00 53.7a 53.35 ND BD-105 8.30 15.56 14.3 12.9 13.8 13.8 ND ND ND ND 33.10 54.818 54.83 ND BD-106 7.90 15.16 14.3 12.7 13.7 13.9 ND ND ND ND 31.70 53.4'8 54.57 22.87 BD-107 8.20 15.46 14.3 14.4 14.6 14.6 ND ND ND ND 32.60 54.~8 57.87 25.27 BD-108 8.70 15.96 13.4 13.5 14.2 13.8 ND ND ND ND 34.90 56.~8 54.87 ND BD-109 11.80 19.06 17.1 17.4 18.6 17.5 ND ND ND ND 47.10 68.88 70.63 23.53 BD-110 7.90 15.16 14.3 14.6 13.8 14.2 ND ND ND ND 31.70 53.4i8 56.95 25.25 BD-111 a 8.60 15.86 13.6 13.6 13.7 13.5 ND ND ND ND 34.40 56.1:8 54.41 ND BD-112 7.90 15.16 12.9 13.6 14.0 13.7 ND ND ND ND 31.80 53.~8 54.19 22.39 BD-113a 9.10 16.36 15.4 14.8 15.0 14.7 ND ND ND ND 36.50 58.Z8 59.91 23.41 BD-114 8.80 16.06 14.8 13.8 14.6 14.3 ND ND ND ND 35.30 57.d8 57.55 22.25 0I BD-115 8.90 16.16 14.3 14.4 14.5 14.4 ND ND ND ND 35.70 57.4;8 57.65 21.95

,..,, BD-116 9.60 16.86 15.5 15.5 15.5 15.0 ND ND ND ND 38.20 59.98 61.55 23.35

,..,, Ind - Outer BD-201 12.20 19.46 19.0 19.0 18.5 18.5 ND ND ND ND 44.00 65.tl8 75.05 31.05 BD-202 9.10 16.36 14.1 14.2 14.6 14.2 ND ND ND ND 36.30 58.08 57.07 ND BD-203 8.80 16.06 15.0 15.1 14.9 15.1 ND ND ND ND 35.10 56.~8 60.07 24.97 BD-204 7.90 15.16 13.4 13.1 14.5 13.6 ND ND ND ND 31.60 53.38 54.57 22.97 BD-205 8.20 15.46 13.1 14.2 13.7 13.5 ND ND ND ND 32.90 54.cl8 54.53 ND BD-206 8.80 16.06 14.2 14.2 15.1 14.4 ND ND ND ND 35.40 57.118 57.95 22.55 BD-207 7.80 15.06 12.9 13.2 13.9 13.4 ND ND ND ND 31.10 52.88 53.37 22.27 BD-208 8.70 15.96 14.0 14.2 14.2 14.1 ND ND ND ND 34.90 56.68 56.55 ND BD-209 13.20 20.46 16.7 17.0 17.9 17.5 ND ND ND ND 52.90 74.68 69.07 ND BD-210 10.70 17.96 17.1 16.7 16.9 16.6 ND ND ND ND 42.60 64.38 67.35 24.75 BD-211 13.20 20.46 18.5 18.7 19.3 18.7 ND ND ND ND 52.70 74.48 75.23 22.53 BD-212 11.30 18.56 14.1 14.8 14.9 14.3 ND ND ND ND 45.10 66.B8 58.09 ND BD-213 7.70 14.96 14.0 14.0 14.7 14.1 ND ND ND ND 31.00 52.i\8 56.77 25.77 BD-214 10.10 17.36 16.6 16.5 18.6 17.4 ND ND 8.50 7.29 40.40 62.18 69.09 28.69 BD-215 8.40 15.66 14.6 13.9 14.4 14.2 ND ND ND ND 33.50 55.28 57.13 23.63 BD-216 10.80 18.06 16.0 16.0 15.8 15.9 ND ND ND ND 43.10 64.&8 63.71 ND Ind- Near BD-06 8.50 15.76 13.8 14.1 15.4 14.3 ND ND ND ND 33.80 55.S8 57.61 23.81 BD-19 9.80 17.06 16.2 15.7 15.6 16.0 ND ND ND ND 39.20 60.98 63.55 24.35 BD-20 9.50 16.76 15.4 15.1 15.0 14.5 ND ND ND ND 37.90 59.68 l

60.03 22.13 BD-21 8.90 16.16 15.4 14.4 15.2 14.9 ND ND ND ND 35.60 5q3 59.89 24.29 Other (ISFSI) BD-ISFSl-104-3 12.80 20.06 17.8 18.5 20.0 17.6 ND ND ND ND 51.10 72.~8 73.91 22.81 BD-ISFSl-104-4 12.80 20.06 18.5 19.9 20.4 19.5 ND ND 7.6 ND 51.40 73.18 78.27 26.87 BD-ISFSl-105-3 13.20 20.46 19.9 22.6 24.3 20.6 ND 9.40 11.10 7.39 52.80 74.58 87.39 34.59 BD-ISFSl-105-4 17.10 24.36 30.6 34.2 34.1 30.2 13.50 17.10 17.00 13.11 68.40 90.1a 129.11 60.71 BD-ISFSl-110-3 11.40 18.66 16.1 17.8 18.1 20.1 ND ND ND 8.69 45.80 67.58 72.09 26.29 BD-ISFSl-110-4 13.20 20.46 22.1 23.5 23.6 21.6 8.90 10.30 10.40 8.41 52.80 74.58 90.81 38.01 ND= Non-Detect

TABLE C-X.2 MEAN QUARTL Y OSLO RESULTS FOR THE INNER RING, OUTER RING, OTHER, CONTROL, AND INDEPENDENT SPENT FUEL STORAGE INSTALLATION (ISFSI) LOCATIONS FOR BRAIDWOOD STATION, 2019 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. +/-2S.D. +/- 2 S.D. +/-2 S.D. +/-2 S.D.

JAN-MAR 14.4 +/- 2.1 15.2 +/- 3.8 15.0 +/- 1.9 15.0 +/- 0.0 20.8 +/- 10.4 APR-JUN 14.1 +/- 2.4 15.3 +/- 3.7 15.2 +/- 1.5 14.7 +/- 0.0 22.8 +/- 12.1 JUL-SEP 14.4 +/- 2.6 15.7 +/- 3.7 15.3 +/- 1.1 15.6 +/- 0.0 23.4 +/- 11.5 OCT-DEC 14.3 +/- 2.0 15.3 +/- 3.7 15.0 +/- 1.4 15.0 +/- 0.0 21.6 +/- 8.8 TABLE C-X.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

SITE BOUNDARY 64 12.5 18.6 14.3 +/- 2.3

(') INTERMEDIATE DISTANCE 64 12.9 19.3 15.4 +/- 3.6 I

I\) OTHER 28 13.8 16.4 15.1 +/- 1.5 CA)

CONTROL 4 14.7 15.6 15.1 +/- 0.8 ISFSI 24 16.1 34.2 22.1 +/- 10.2 SITE BOUNDARY STATIONS- BD-101, BD-102, BD-103, BD-104, BD-105, BD-106, BD-107, BD-108, BD-109, BD-110, BD-111A, BD-112 BD-113A, BD-114, BD-115, BD-116 INTERMEDIATE DISTANCE STATIONS - BD-201, BD-202, BD-203, BD-204, BD-205, BD-206, BD-207, BD-208, BD-209, BD-210, BD-211, BD-212, BD-213, BD-214, BD-215, BD-216 OTHER STATIONS - BD-02, BD-04, BD-05, BD-06, BD-19, BD-20, BD-21 CONTROL STATION - BD-03 ISFSI STATIONS - BD-ISFSl-104-3, BD-ISFSl-104-4, BD-ISFSl-105-3, BD-ISFSl-105-4, BD-ISFSl-110-3, BS-ISFSl-110-4

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

Collected in the Vicinity of Braidwood Station, 2000 - 2019

~~BD-10Kankaee River, Downstream 10.0 8.0 6.0 uc.

4.0 2.0 0.0 -t------;------------t-------1 01-01-00 12-30-04 12-29-09 12-28-14 12-27-19 BD-25 (C) Kankakee River, Upstream 16.0 14.0 12.0 10.0 uc. 8.0 6.0 4.0 2.0 0.0 -t-------t-----------------1 01-01-00 12-30-04 12-29-09 12-28-14 12-27-19 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, 2007 - 2019 BD-38 Main Drainage Ditch 14.0 12.0 10.0

! 8.0 0c..

6.0 4.0 2.0 0.0 + - - - - - - - 1 1 - - - - - - - + - - - - - - + - - - - - - - +

01-25-07 04-19-10 07-12-13 10-04-16 12-28-19 BD-40 Braidwood Station Cooling Lake 16.0 14.0 12.0 10.0

...J i3 8.0 c..

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

10-05-06 01-25-10 05-17-13 09-06-16 12-28-19 C-25

FIGURE C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2019

.. ~ -*BD-55.Northgondf;'atlan.Site.

14.0 12.0 10.0

! 8.0 uc.

6.0 4.0 2.0 0.0 11J }\\~~/%

01-25-07 04-19-10 07-12-13 10-04-16 12-28-19 BD-56 South Pond Fatlan Site 10.0 8.0 6.0 uc.

4.0 2.0 0.0 -t-----------1-------i,__-----1 01-25-07 04-19-10 07-12-13 10-04-16 12-28-19 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 - 2019 BD-10 Kankakee River, Downstream 3000 2500 2000 1500 1000 500 O+-..><.......;~'-Q"~;..+--~~~~-+-~~~~--r~~~~--f 03-25-00 03-04-05 02-11-10 01-21-15 12-31-19 BD-25 (C) Kankakee River, Upstream 400 300 uc. 200 100 0+-~~~~-1-~~~~--r~~~~~+--~~~--1 03-25-00 03-04-05 02-11-10 01-21-15 12-31-19 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 - 2019

- - - - ~*BD-38Main Drainage.Ditch . . ..

2400 2100 1800 1500

~

uc. 1200 900 600 300 0

03-09-06 08-21-09 02-02-13 07-17-16 12-30-19 BD-40 Braidwood Station Cooling Lake 400 300

~ 200 c.

100 0+-~~~~+-~~~~--~~~~--~~~--1 07-20-06 11-29-09 04-10-13 08-20-16 12-31-19 C-28

FIGURE C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2019 BD-55 North Pond Fatlan Site 250 200 150

..J B c.

100 50 0+-~~~--1~~~~-r~~~~--~~~-----1 03-29-07 06-06-10 08-14-13 10-22-16 12-31-19 BD-56 South Pond Fatlan Site 250 200 150 uc.

100 50 0+-~~~--ir--~~~---~~~~--~~~~~

03-29-07 06-06-10 08-14-13 10-22-16 12-31-19 C-29

FIGURE C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2019 10.0 8.0 6.0 uc.

4.0 2.0 0.0 + - - - - - - - - - - - - + - - - - - + - - - - - - - 1 01-29-00 01-21-05 01-14-10 01-07-15 12-31-19 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 - 2019 BD-22 Wilmington 8000 7200 6400 5600 4800

~ 4000 c.

3200 2400 1600 800 o~~~~~~~~~~~~~~~~~~~

01-29-00 01-21-05 01-14-10 01-07-15 12-31-19 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 - 2019

~BD-13~BraidwoodCity Hall Welk .

500 400 300 uc.

200 100 O+-~~~-f-"-~~~-1-~~~-+-~~~-+-~~~~

01-07-00 01-05-04 01-03-08 01-01-12 12-30-15 12-28-19 BD-34 Gibson Well 700 600 500 400 uc.

300 200 100 0

01-07-00 01-05-04 01-03-08 01-01-12 12-30-15 12-28-19 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 - 2019 BD-35 Joly Well 500 400 300

..J

~a.

200

\

100 0

01-07-00 01-05-04 01-03-08 01-01-12 12-30-15 12-28-19 BD-36 Hutton Well 1200 1000 800

~ 600 a.

400 200 0+-~~~1--~~--1~~~-+-~~~---~~~-1 01-07-00 01-05-04 01-03-08 01-01-12 12-30-15 12-28-19 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 - 2019

... BD-37'~Nurczy.kW.elL 600 500 400 uc. 300 200 100 O+----:<...--O-'--i--~~--i,___~~-+~~~-+~~~-i 01-07-00 01-05-04 01-03-08 01-01-12 12-30-15 12-28-19 DUE TO 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 - 2019 BD-50 Skole Well 1000 900 800 700 0 600 tiQ. 500 400 300 200 100 0

01-01-07 04-02-10 07-02-13 10-01-16 01-01-20 STATION 80-50 WAS /NIT/ALLY DISCONTINUED ON 10118107 AND RESUMED ON 04108110 BD-51 Fatlan Well 600 500 400 tiQ. 300 200 100 0+-~~~~--~~~~--~~~~1--~~~--1 01-03-07 04-03-10 07-02-13 09-30-16 12-30-19 C-35

FIGURE C-13 Ground/Well Water - Tritium - Station BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2019 BD-54 Cash Well 600 500 400

~ 300 200 100 0+-~~~--1-~~~--'f--~~~-4--~~~---1 01-03-07 04-03-10 07-02-13 09-30-16 12-30-19 C-36

FIGURE C-14 Air Particulate - Gross Beta- Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2019 BD-03 (C) County Line Road 80.0 60.0 M

~

0 C2. 40.0 M

9 w

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

01-07-00 01-04-05 01-02-10 12-31-14 12-29-19 BD-06 Godley 60.0 50.0 M 40.0 u

~ 30.0 9

w 0

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

01-07-00 01-04-05 01-02-10 12-31-14 12-29-19 C-37

FIGURE C-15 Air Particulate - Gross Beta- Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2019 60.0 50.0

.., 40.0

~

0 Q.

.., 30.0 q

w Cl 20.0 10.0 0.0 + - - - - - - - + - - - - - - + - - - - - - - - - - 1 01-07-00 01-04-05 01-02-10 12-31-14 12-29-19 BD-20 Near Field, N 70.0 60.0 50.0 E

~ 40.0 Q.

w Cl 30.0 Cl 20.0 10.0 0.0 + - - - - - - - + - - - - - + - - - - - - - - - - - l 01-07-00 01-04-05 01-02-10 12-31-14 12-29-19 C-38

FIGURE C-16 Air Particulate - Gross Beta- Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2019 BD-21 Near Field, NE 70.0 60.0 50.0

~

0 40.0

..,c..

w 0

30.0 0

20.0 10.0 0.0 ...,___ _ ___,___ _ ___,___ _ _ _._____ __

01-07-00 01-04-05 01-02-10 12-31-14 12-29-19 C-39

FIGURE C-17 Air Particulate - Gross Beta- Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2019 60.0 50.0 M 40.0

~

0 Q.

g 30.0 uJ Cl 20.0 10.0 0.0 - - - - - - + - - - - - - - - - - - -

07-07-05 02-18-09 10-02-12 05-16-16 12-29-19 BD-04 Near Field, N 60.0 50.0 40.0 M

.§ 0Q. 30.0 M

Cl uJ

~ 20.0 10.0 0.0 +-------+-----1-----1--------1 07-07-05 02-18-09 10-02-12 05-16-16 12-29-19 C-40

FIGURE C-18 Air Particulate - Gross Beta- Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2019 BD-05 Near Field, NE 60.0 50.0 40.0 M

.E 0c. 30.0 M

0 uJ 0

~ 20.0 10.0 0.0 - - - - - - + - - - - - - - + - - - - - - - l f - - - - - - - - - - 1 07-07-05 02-18-09 10-02-12 05-16-16 12-29-19 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 TBE Identification Known Ratio ofTBE to Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Analytics Result Value March 2019 E12468A Milk Sr-89 pCi/L 87.1 96 0.91 A Sr-90 pCi/L 12.6 12.6 1.00 A E12469A Milk Ce-141 pCi/L 113 117 0.97 A Co-58 pCi/L 153 143 1.07 A Co-60 pCi/L 289 299 0.97 A Cr-51 pCi/L 233 293 0.80 A Cs-134 pCi/L 147 160 0.92 A Cs-137 pCi/L 193 196 0.98 A Fe-59 pCi/L 153 159 0.96 A 1-131 pCi/L 91.5 89.5 1.02 A Mn-54 pCi/L 149 143 1.04 A Zn-65 pCi/L 209 220 0.95 A E12470 Charcoal 1-131 pCi 77.5 75.2 1.03 A E12471 AP Ce-141 pCi 60.7 70.2 0.87 A Co-58 pCi 87.9 85.8 1.02 A Co-60 pCi 175 179 0.98 A Cr-51 pCi 165 176 0.94 A Cs-134 pCi 91.2 95.9 0.95 A Cs-137 pCi 120 118 1.02 A Fe-59 pCi 108 95.3 1.13 A Mn-54 pCi 94.2 85.7 1.10 A Zn-65 pCi 102 132 0.77 w E12472 Water Fe-55 pCi/L 2230 1920 1.16 A E12473 Soil Ce-141 pCi/g 0.189 0.183 1.03 A Co-58 pCi/g 0.209 0.224 0.93 A Co-60 pCi/g 0.481 0.466 1.03 A Cr-51 pCi/g 0.522 0.457 1.14 A Cs-134 pCi/g 0.218 0.250 0.87 A Cs-137 pCi/g 0.370 0.381 0.97 A Fe-59 pCi/g 0.263 0.248 1.06 A Mn-54 pCi/g 0.248 0.223 1.11 A Zn-65 pCi/g 0.371 0.344 1.08 A E12474 AP Sr-89 pCi 88.3 95.2 0.93 A Sr-90 pCi 11.7 12.5 0.94 A August2019 E12562 Soil Sr-90 pCi/g 4.710 6.710 0.70 w (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A =Acceptable - reported result falls within ratio limits of 0.80-1.20 W =Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30

=

N Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (Page 1 of 2)

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

Number Value (a) Analytics Result Value September 2019 E12475 Milk Sr-89 pCi/L 70.0 93.9 0.75 w Sr-90 pCi/L 12.0 12.9 0.93 A E1247ff.. Milk.. ******cePT.lJT **pCTlC ..... 150 ... * *rnr * ** 0:90** *** *A Co-58 pCi/L 170 175 0.97 A Co-60 pCi/L 211 211 1.00 A Cr-51 pCi/L 323 331 0.98 A Cs-134 pCi/L 180 207 0.87 A Cs-137 pCi/L 147 151 0.97 A Fe-59 pCi/L 156 148 1.05 A 1-131 pCi/L 81.1 92.1 0.88 A Mn-54 pCi/L 160 154 1.04 A Zn-65 pCi/L 303 293 1.03 A E12477 Charcoal 1-131 pCi 95.9 95.1 1.01 A E12478 AP Ce-141 pCi 129 138 0.93 A Co-58 pCi 128 145 0.88 A Co-60 pCi 181 174 1.04 A Cr-51 pCi 292 274 1.07 A Cs-134 pCi 166 171 0.97 A Cs-137 pCi 115 125 0.92 A Fe-59 pCi 119 123 0.97 A Mn-54 pCi 129 128 1.01 A Zn-65 pCi 230 242 0.95 A E12479 Water Fe-55 pCi/L 1810 1850 0.98 A E12480 Soil Ce-141 pCi/g 0.305 0.276 1.10 A Co-58 pCi/g 0.270 0.289 0.93 A Co-60 pCilg. 0.358 0.348 1.03 A Cr-51 pCi/g 0.765 0.547 1.40 N(1l Cs-134 pCi/g 0.327 0.343 0.95 A Cs-137 pCi/g 0.308 0.321 0.96 A Fe-59 pCi/g 0.257 0.245 1.05 A Mn-54 pCi/g 0.274 0.255 1.07 A Zn-65 pCi/g 0.536 0.485 1.11 A E12481 AP Sr-89 pCi 95.9 91.9 1.04 A Sr-90 pCi 12.3 12.6 0.97 A E12563 Soil Sr-90 pCi/g 0.392 0.360 1.09 A (a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W =Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) See NCR 19-27 (Page 2 of 2)

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (bl Number Value (a) Range Value February 2019 19-GrF40 AP Gross Alpha Sq/sample 0.184 0.528 0.158 - 0.898 A Gross Beta Sq/sample 0.785 0.948 0.474 - 1.422 A 19-MaS40 Soil Ni-63 Bq/kg 420 519.0 363- 675 A Sr-90 Bq/kg (1) NRl3 l 19-MaW40 Water Am-241 Bq/L 0.764 0.582 0.407 - 0.757 N(4l Ni-63 Bq/L 4.72 5.8 4.1 - 7.5 A Pu-238 Bq/L 0.443 0.451 0.316 - 0.586 A Pu-239/240 Bq/L -0.00161 0.0045 (2) A 19-RdF40 AP U-234/233 Sq/sample 0.1138 0.106 0.074- 0.138 A U-238 Sq/sample 0.107 0.110 0.077 - 0.143 A 19-RdV40 Vegetation Cs-134 Sq/sample 2.14 2.44 1.71-3.17 A Cs-137 Sq/sample 2.22 2.30 1.61 - 2.99 A Co-57 Sq/sample 2.16 2.07 1.45 - 2.69 A Co-60 Sq/sample 0.02382 (1) A Mn-54 Sq/sample -0.03607 (1) A Sr-90 Sq/sample -0.1060 (1) N(5J Zn-65 Sq/sample 1.35 1.71 1.20 - 2.22 w August 2019 19-GrF41 AP Gross Alpha Sq/sample 0.192 0.528 0.158 - 0.898 w Gross Beta Sq/sample 0.722 0.937 0.469 - 1.406 A 19-MaS41 Soil Ni-63 Bq/kg 436 629 440 - 818 N(Bl Sr-90 Bq/kg 444 572 400 - 744 w 19-MaW41 Water Am-241 Bq/L NR(7l Ni-63 Bq/L 7.28 9.7 6.8 - 12.6 w Pu-238 Bq/L 0.0207 0.0063 (2) A Pu-239/240 Bq/L 0.741 0.727 0.509 - 0.945 A 19-RdF41 AP U-234/233 Sq/sample 0.0966 0.093 0.065 - 0.121 A U-238 Sq/sample 0.0852 0.096 0.067-0.125 A 19-RdV41 Vegetation Cs-134 Sq/sample 0.0197 (1) A Cs-137 Sq/sample 3.21 3.28 2.30- 4.26 A Co-57 Sq/sample 4.62 4.57 3.20 - 5.94 A Co-60 Sq/sample 4.88 5.30 3.71 - 6.89 A Mn-54 Sq/sample 4.54 4.49 3.14- 5.84 A Sr-90 Sq/sample 0.889 1.00 0.70 - 1.30 A Zn-65 Sq/sample 2.78 2.85 2.00 - 3.71 A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOEIMAPEP evaluation:

=

A Acceptable - reported result falls within ratio limits of 0. 80-1. 20

=

W Acceptable with warning - reported result falls within 0. 70-0. 80 or 1. 20-1. 30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) False positive test (2) Sensitivity evaluation (3) See NCR 19-12 (4) See NCR 19-13 (5) See NCR 19-14 (6) See NCR 19-25 (Page 1 of 1)

(7) See NCR 19-26

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value(*) Limits Value April 2019 Rad-117 Water Ba-133 pCi/L 26.3 24.1 18.6 - 27.8 A N(1)

Cs-134 pCi/L 15.2 12.1 8.39 - 14.4

-*es~1s1*

pCifl 33:6***** ***~3+***** ..Z8:8*3Sk A Co-60 pCi/L 11.9 11.5 8.67 - 15.5 A Zn-65 pCi/L 87.1 89.2 80.3 - 107 A GR-A pCi/L 19 19.3 9.56 - 26.5 A GR-B pCi/L 20.2 29.9 19.1 - 37.7 A U-Nat pCi/L 55.5 55.9 45.6 - 61.5 A H-3 pCi/L 21500 21400 18700 - 23500 A N(2)

Sr-89 pCi/L 44.9 33.3 24.5 - 40.1 Sr-90 pCi/L 24.5 26.3 19.0 - 30.7 A 1-131 pCi/L 28.9 28.4 23.6 - 33.3 A October 2019 Rad-119 Water Ba-133 pCi/L 42.7 43.8 35.7 - 48.8 A Cs-134 pCi/L 53.5 55.9 45.2 - 61.5 A Cs-137 pCi/L 77.7 78.7 70.8 - 89.2 A Co-60 pCi/L 51.5 53.4 48.1-61.3 A Zn-65 pCi/L 36.6 34.0 28.5 - 43.1 A GR-A pCi/L 40.5 27.6 14.0 - 36.3 N(3l GR-B pCi/L 36.3 39.8 26.4 - 47.3 A U-Nat pCi/L 27.66 28.0 22.6-31.1 A H-3 pCi/L 22800 23400 20500 - 25700 A Sr-89 pCi/L 47.1 45.5 35.4 - 52.7 A Sr-90 pCi/L 32.5 26.5 19.2- 30.9 N(4l 1-131 pCi/L 26.0 23.9 19.8 - 28.4 A December 2019 QR 1204190 Water Sr-90 pCi/L 20.1 18.6 13.2 - 22.1 A (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

=

A Acceptable - Reported value falls within the Acceptance Limits N =Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 19-10 (2) See NCR 19-11 (3) See NCR 19-23 (4) See NCR 19-24 (Page 1 of 1)

APPENDIX E ERRATA DATA

Intentionally left blank In 2019, the Annual Radiological Groundwater Protection Program Report (ARGPPR) did not include the following information regarding missed sample analyses:

AR 0427997 - Braidwood Station did not analyze seven (7)

Radiological Groundwater Protection Program wells in 2018 for Gamma, Strontium 89 and 90, and Gross Alpha and Beta. These seven RGPP wells were:

VB-10-R, VB-9-1, VB-8-2R, VB-6-1, VB-7-1, VB-5-2, VB-11-1.

EN-BR-408-4160 specifies the well type (Background, Detection, Surface Water) for Braidwood Station. Revision 4 of EN-BR-408-4160 specified these wells as Consent Order wells. Revision 5 (implemented on 812812017) specified these wells as Detection wells.

In 2017, these wells were sampled per procedure. EN-AA-408-4000 specifies the sampling parameters for a Detection well. These wells are sampled by the vendor GHD with Environmental oversight.

As extent of condition, Environmental discovered PS-10 was not sampled for Gamma, Strontium 89 and 90, or Gross Alpha and Beta.

PS-10 is a Detection well and is required by procedure for these sampling parameters.

It was found that the sampling vendor used Revision 4 of the EN-BR-408-4160 instead of the current Revision 9.

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 2019 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Braidwood Station Braceville, IL 60407 May 2020

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction ...................................................................................................................... 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ........................................................................ 2 C. Program Description ............................................................................................ 3 D. Characteristics of Tritium (H-3) ............................................................................ 3 Ill. Program Description ....................................................................................................... 4 A. Sample Analysis .................................................................................................. 4 B. Data Interpretation ............................................................................................... 4 C. Background Analysis ........................................................................................... 5 IV. Results and Discussion ................................................................................................. 8 A. Missed Samples .................................................................................................. 8 B. Groundwater Results ........................................................................................... 8 C. Surface Water Results ......................................................................................... 8 D. Summary of Results - Inter-laboratory Comparison Program ............................ 9 E. Leaks, Spills, and Releases ................................................................................. 9 F. Trends .................................................................................................................. 9 G. Investigations ...................................................................................................... 9 H. Actions Taken ...................................................................................................... 9

Appendices Appendix A Location Designation

..... Tables...... .

Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Braidwood Station, 2019 Figures Figure A-1 RGPP Protected Area Monitoring Well Sample Locations Braidwood Station, 2019 Figure A-2 RGPP Surface Water Sample Locations Braidwood Station, 2019 Figure A-3 RGPP VB-1 -VB-4 Area Monitoring Well Sample Locations Braidwood Station, 2019 Figure A-4 RGPP Slowdown Line Monitoring Well Sample Locations Braidwood Station, 2019 Figure A-5 RGPP CWBD Monitoring Well Sample Locations Braidwood Station, 2019 Appendix B Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2019 Table B-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2019 Table B-1.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2019 Table B-11.1 Concentrations of Tritium, Strontium and Gross Alpha in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 Table B-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2019 ii

I. Summary and Conclusions In 2019, 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 2019. During that time period, 352 analyses were performed on 157 samples from 45 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 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 74 of 157 samples. The tritium concentrations ranged from 193 +/- 122 pCi/L to 1,440 +/- 216 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 and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater water samples throughout the sampling year in 2019. Gross Alpha (dissolved) was detected in 2 groundwater samples. The concentrations ranged from 1.3 to 7.7 pCi/L. Gross Alpha (suspended) was detected in 1 groundwater sample at a concentration of 2.2 +/- 1.0 pCi/L. Gross Beta (dissolved and suspended) was not detected in any groundwater samples.

Gross Alpha analyses in the dissolved and suspended fractions were performed on surface water samples during the 3rct quarter of 2019. 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 not performed in 2019.

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 .

...... ~J:hesite.isJocatedjn.. northeasternJLlinois,20.mi.le.s..so.uib.::s.o.utbwes_t.QLJQJieL .......

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 2019.

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 chemicaily and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as non tritiated groundwater .

. Ill ...... ProgramDescr:ipiion .

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 2019.

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 and Gross Beta (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 .. Tr:itiumJ:::>roduction...............

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 2019. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

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

Illinois surface water data were typically less than 100 pCi/L.

The USEPA RadNet surface water data typically has a reported

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

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

IV. Results and Discussion A. Missed Samples

1. Well MW-2 was not sampled in the 1st Quarter, 2019. (IR 04251679)

Two samples were taken during the 2nd Quarter in order to have 4 sets

-oraaTaroffne20T9*calernaaryear.

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 1,440 pCi/L.

(Tables B-1.1 & B-11-1, Appendix B)

Strontium Sr-89 and Sr-90 were analyzed for in 35 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-1.1, Appendix B)

Gross Alpha and Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater water samples throughout the sampling year in 2019. Gross Alpha (dissolved) was detected in 2 groundwater samples. The concentrations ranged from 1.3 to 7.7 pCi/L.

Gross Alpha (suspended) was detected in 1 groundwater sample at a concentration of 2.2 +/- 1.0 pCi/L. Gross Beta (dissolved and suspended) 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 not analyzed in 2019.

(Table B-1.3, Appendix B)

Gamma Emitters Naturally-occurring K-40 was detected in one sample at a concentration of from 42 +/- 24 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-11.1, 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-11.1, 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-11.1, 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-11.2, Appendix B)

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

E. Leaks, Spills, and Releases There were no leaks, spills or releases to groundwater in 2019.

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.

RW-11 and RW-12 remediation wells have been discontinued as of April 1, 2019.

G. Investigations There were no new investigations in 2019.

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

.....p~ermitte~dJoJh.Ji same . .fil9llfl~L§§otb.filQQQ.MJ291bYY9.Y~:.Tb.E3 ......

corresponding activity values are included as part of Table B-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.

APPENDIX A LOCATION DESIGNATION

Intentionally left blank TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Braidwood Station, 2019 Station Code SamQle DescriQtion DITCH F (DS-2) Surface Water MW-102R Monitoring Well MW-11 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-2 Monitoring Well MW-4 Monitoring Well MW-5 Monitoring Well MW-6 Monitoring Well MW-7 Monitoring Well MW-9 Monitoring Well MW-BW-201S Monitoring Well MW-BW-202S Monitoring Well MW-BW-203S Monitoring Well MW-BW-2071 Monitoring Well OWM31P Drinking Water 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 PS-16 Monitoring Well RW-6 Recovery Well RW-11 Recovery Well RW-12 Recovery Well SG-BW-102 DITCH C Surface Water VB10-1R Monitoring Well VB1-1 Monitoring Well VB11-1 Monitoring Well VB2-5DR Monitoring Well VB3-2 Monitoring Well VB5-2 Monitoring Well VB6-1 Monitoring Well VB7-1 Monitoring Well VB8-2R Monitoring Well VB9-1 Monitoring Well

0

~M 4100 3oon

~

PLANT PROPEPTY UNE figure 1 EXISTING FENCE LINE SLOWDOWN UNE MONITORING WELLS TO BE

@ RGPP SAMPLING LOCATION SAMPLED AS PART OF THE RGPP PROTECTED AREA EXELON GENERATION BRAIDWOOD STATION Bracevllle, 11/lno/s Figure A-1 RGPP Protected Area Monitoring Well Sample Locations Braidwood Station, 2019

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APPENDIX B DATA TABLES

Intentionally left blank TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2019 RES ULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-2 05/07/19 667 +/- 149 MW-2 06/11/19 252 +/- 130 MW-2 08/27/19 407 +/- 134 < 5.0 < 1.0 1.7 +/- 0.8 < 0.6 3.7 +/- 0.9 < 1.4 MW-2 08/27/19 Recount 2.4 +/- 0.8 MW-2 08/27/19 Reanalysis < 0.6 MW-2 10/10/19 216 +/- 123 MW-4 03/07/19 722 +/- 154 MW-4 05/10/19 731 +/- 152 MW-4 09/24/19 362 +/- 131 < 4.9 < 0.5 < 1.9 < 0.7 MW-4 10/10/19 419 +/- 133 MW-5 03/20/19 355 +/- 133 MW-5 06/20/19 283 +/- 132 MW-5 08/28/19 < 189 < 7.3 < 0.9 < 0.7 < 0.6 MW-5 10/15/19 208 +/- 122 < 2.4 < 0.8 < 1.0 < 0.4 MW-6 03/14/19 1120 +/- 188 MW-6 05/17/19 618 +/- 146 MW-6 09/24/19 582 +/- 139 < 5.9 < 0.7 < 2.0 < 1.6 MW-6 10/13/19 752 +/- 153 MW-7 03/19/19 254 +/- 129 MW-7 06/20/19 244 +/- 128 MW-7 09/24/19 198 +/- 123 < 5.0 < 0.6 < 0.9 2.2 +/- 1.0 MW-7 10/15/19 257 +/- 125 MW-9 05/07/19 212 +/- 133 MW-102R 03/05/19 < 196 MW-102R 06/11/19 < 195 MW-102R 09/27/19 < 182 < 6.7 < 0.9 < 0.3 < 0.9 MW-102R 10/16/19 < 184 MW-11 03/07/19 214 +/- 130 MW-11 05/10/19 < 191 MW-11 08/27/19 377 +/- 135 < 5.3 < 0.8 < 0.8 < 0.6 2.8 +/- 0.8 < 1.4 MW-11 10/10/19 < 187 MW-1410 03/14/19 519 +/- 142 MW-1410 05/17/19 388 +/- 137 MW-1410 09/25/19 435 +/- 136 < 8.0 < 0.8 < 2.7 < 1.6 MW-1410 10/10/19 516 +/- 136 MW-1420 03/07/19 1330 +/- 208 MW-1420 06/17/19 1370 +/- 212 MW-1420 09/24/19 1440 +/- 216 < 1.8 < 0.7 < 4.3 < 3.1 MW-1420 10/10/19 1320 +/- 203 MW-1430 03/19/19 < 195 MW-1430 05/07/19 < 192 MW-1430 09/30/19 < 189 < 7.3 < 0.9 7.7 +/- 1.4 < 0.9 MW-1430 10/10/19 < 184 MW-1440 03/20/19 329 +/- 134 MW-1440 06/20/19 346 +/- 134 MW-1440 08/28/19 396 +/- 135 < 7.1 < 1.0 < 0.7 < 0.6 MW-1440 10/15/19 361 +/- 134 < 2.4 < 0.7 < 0.8 < 0.4 MW-1450 03/12/19 < 196 MW-1450 06/24/19 < 188 MW-1450 09/17/19 < 188 < 6.7 < 0.9 < 0.6 < 1.1 MW-1450 12/19/19 < 188 BOLD Values =Unable to meet detection limits due to high solids conten B-1

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

MW-154 03/06/19 < 197 MW-154 06/12/19 < 192 MW-154 09/26/19 < 168 < 6.8 < 0.8 < 0.4 < 0.9

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MW-154 10/17/19 <~r9o-MW-155 03/06/19 < 192 MW-155 06/12/19 < 193 MW-155 09/26/19 < 192 < 4.3 < 1.0 < 0.6 < 0.9 MW-155 10/17/19 < 189 MW-1590 02/19/19 394 +/- 138 MW-1590 05/10/19 433 +/- 139 MW-1590 08/27/19 452 +/- 135 < 4.5 < 0.7 < 1.2 < 0.6 5.3 +/- 1.1 < 1.4 MW-1590 10/13/19 238 +/- 126 MW-1620 03/20/19 209 +/- 127 MW-1620 06/20/19 224 +/- 127 MW-1620 08/27/19 519 +/- 140 < 5.5 < 0.8 < 1.0 < 0.6 4.7 +/- 1.0 < 1.4 MW-1620 10/15/19 236 +/- 124 MW-BW-201S 02/19/19 741 +/- 157 MW-BW-201S 05/17/19 486 +/- 143 MW-BW-201S 09/25/19 544 +/- 142 < 9.0 < 0.6 < 0.9 < 0.6 MW-BW-201S 10/13/19 491 +/- 133 MW-BW-202S 02/19/19 288 +/- 135 MW-BW-202S 05/10/19 235 +/- 131 MW-BW-202S 09/23/19 232 +/- 126 < 5.7 < 1.0 < 1.9 < 0.6 MW-BW-202S 10/12/19 269 +/- 127 MW-BW-203S 02/19/19 < 196 MW-BW-203S 05/10/19 < 194 MW-BW-203S 09/23/19 237 +/- 127 < 5.1 < 0.6 < 2.0 < 0.6 MW-BW-203S 10/13/19 193 +/- 122 MW-BW-2071 03/07/19 895 +/- 169 MW-BW-2071 05/17/19 848 +/- 161 MW-BW-2071 06/17/19 792 +/- 160 MW-BW-2071 09/24/19 822 +/- 160 < 6.1 < 0.8 < 2.4 < 1.6 MW-BW-2071 11/20/19 833 +/- 161 OWM31P 09/26/19 < 189 PS-7 01/22/19 < 192 PS-8 01/23/19 < 187 PS-9 01/22/19 < 185 PS-10 01/23/19 829 +/- 154 PS-10 03/05/19 573 +/- 143 PS-10 06/04/19 229 +/- 130 PS-10 09/30/19 224 +/- 119 < 6.4 < 0.9 < 0.7 < 1.0 PS-10 10/14/19 277 +/- 124 PS-11 01/22/19 < 187 PS-12 01/22/19 494 +/- 137 PS-12 03/05/19 403 +/- 139 PS-12 06/04/19 < 192 PS-12 09/30/19 < 191 < 7.7 < 0.8 < 0.5 < 0.9 PS-12 10/14/19 < 185 PS-13 01/22/19 < 186 PS-14 01/22/19 < 186 PS-15 01/22/19 < 193 PS-16 01/22/19 < 189 RW-6 01/04/19 280 +/- 134 B-2

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

RW-6 02/25/19 406 +/- 136 RW-6 03/21/19 306 +/- 132 RW-6 04/16/19 246 +/- 133 RW-6 05/30/19 247 +/- 131 RW-6 06/04/19 242 +/- 132 RW-6 07/29/19 284 +/- 135 RW-6 08/22/19 308 +/- 128 < 4.8 < 0.7 < 3.0 < 0.6 2.4 +/- 1.3 < 1.4 RW-6 09/30/19 231 +/- 122 < 3.0 < 0.7 < 0.8 < 1.0 RW-6 10/13/19 318 +/- 127 RW-6 11/07/19 < 189 RW-6 12/09/19 < 195 RW-12 01/23/19 < 186 VB1-1 03/06/19 < 196 VB1-1 06/12/19 < 192 VB1-1 09/26/19 < 177 < 7.9 < 0.9 < 0.8 < 0.9 VB1-1 10/17/19 < 187 VB3-2 06/11/19 < 192 VB3-2 09/27/19 < 183 < 4.1 < 1.0 1.3 +/- 0.7 < 0.9 VB3-2 10/16/19 < 186 VB5-2 03/12/19 < 196 VB5-2 06/24/19 < 189 VB5-2 09/17/19 < 188 < 5.7 < 0.7 < 0.7 < 1.4 VB5-2 12/19/19 < 188 VB6-1 03/12/19 < 197 VB6-1 06/24/19 < 187 VB6-1 09/17/19 < 186 < 6.2 < 0.8 < 0.7 < 0.6 VB6-1 12/19/19 < 186 VB7-1 03/12/19 < 197 VB7-1 06/24/19 < 189 VB7-1 09/17/19 < 186 < 6.5 < 0.8 < 0.7 < 0.6 VB7-1 12/19/19 < 185 VB8-2R 03/12/19 < 190 VB8-2R 06/24/19 < 190 VB8-2R 09/17/19 < 182 < 8.1 < 0.7 < 0.8 < 0.6 VB8-2R 12/19/19 < 191 VB9-1 03/12/19 < 190 VB9-1 06/24/19 < 186 VB9-1 09/17/19 < 187 < 5.3 < 0.8 < 1.0 < 0.7 VB9-1 12/19/19 < 185 VB10-1R 03/12/19 < 191 VB10-1R 06/24/19 < 192 VB10-1R 09/17/19 < 186 < 5.5 < 0.9 < 0.9 < 0.6 VB10-1R 12/19/19 < 188 VB11-1 03/12/19 < 192 VB11-1 06/24/19 < 189 VB11-1 09/17/19 < 186 < 7.6 < 0.9 < 0.8 < 1.2 VB11-1 12/19/19 < 184 B-3

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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 <j:s-137 Ba-140 La-140 MW-2 08/27/19 < 14 < 15 < 1 < 1 < 3 < 2 < 3 < 2 < 3 < 5 < 2 < 1 < 1 'I <4 MW-4 09/24/19 < 46 < 97 < 5 < 4 < 9 < 5 < 10 < 6 < 9 < 15 <4 < 4 < 3'1 < 10 MW-5 08/28/19 < 18 < 33 < 1 < 2 < 5 < 1 < 3 < 2 < 4 < 46 < 2 < 1 < 42 < 15 MW-5 10/15/19 < 57 < 61 < 6 < 7 < 12 < 6 < 15 < 8 < 11 < 13 < 8 < 7 < 35 < 12 MW-6 09/24/19 < 44 < 95 < 6 < 6 < 10 < 4 < 10 < 5 < 10 < 14 < 6 <4 < 32 < 9 MW-7 09/24/19 < 47 < 85 < 5 < 4 < 12 < 4 < 9 < 5 < 9 < 14 < 6 < 5 < 40 < 14 MW-102R 09/27/19 < 42 < 92 < 5 < 5 < 10 < 6 < 11 < 5 < 9 < 12 < 6 < 5 < 33 < 8 MW-11 08/27/19 < 16 < 16 < 2 < 2 < 4 < 2 <4 < 2 < 3 < 6 < 2 < 2 < 12 <4 MW-1410 09/25/19 < 42 < 72 <4 < 5 < 10 < 3 < 9 < 4 < 8 < 12 < 5 < 4 < 24 < 9 MW-1420 09/24/19 < 43 < 57 < 4 < 5 < 12 < 5 < 10 < 5 < 10 < 14 < 6 < 4 < 33 < 11 MW-1430 09/30/19 < 51 < 69 < 6 < 7 < 12 < 8 < 15 < 8 < 11 < 13 < 7 < 7 < 36 < 12 MW-1440 08/28/19 < 18 < 12 < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 45 < 1 < 1 < 38 < 15 MW-1440 10/15/19 < 57 < 95 <7 < 7 < 14 < 7 < 16 < 9 < 11 < 14 < 7 < 7 < 35 < 14 MW-1450 09/17/19 < 47 < 106 < 3 < 5 < 11 < 4 < 9 < 5 < 8 < 6 < 6 <4 < 18 < 8 MW-154 09/26/19 < 39 < 89 <4 < 5 < 12 < 5 < 8 < 4 < 8 < 11 < 5 < 5 < 28 < 9 III I

MW-155 09/26/19 < 53 < 122 < 6 < 5 < 12 < 5 < 12 < 6 < 10 < 13 < 5 < 5 < 35 < 9

~ MW-1590 08/27/19 < 16 < 15 < 2 < 2 < 4 < 2 < 3 < 2 < 3 < 6 < 2 < 2 < 13 <4 MW-1620 08/27/19 < 15 < 17 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 6 < 2 < 2 < 12 < 5 MW-BW-201 S 09/25/19 < 51 < 109 < 5 < 5 < 12 < 6 < 9 < 6 < 10 < 15 < 6 < 6 < 37 < 13 MW-BW-2028 09/23/19 < 37 < 63 < 4 < 4 < 8 < 4 < 8 < 4 < 7 < 14 <4 <4 < 28 < 12 MW-BW-2038 09/23/19 < 38 < 87 < 4 < 5 < 8 < 4 < 6 < 4 < 8 < 14 < 5 < 4 < 28 < 10 MW-BW-2071 09/24/19 < 42 < 99 <4 < 5 < 11 < 5 < 11 <4 < 9 < 15 < 5 < 5 < 26 < 11 PS-10 09/30/19 < 58 < 118 < 6 < 8 < 15 < 7 < 12 < 8 < 9 < 11 < 7 < 6 < 32 < 11 PS-12 09/30/19 < 67 < 154 < 7 < 7 < 13 < 7 < 14 < 6 < 11 < 12 < 10 < 5 < 37 < 14 RW-6 08/22/19 < 15 42 +/- 24 < 2 < 2 <4 < 2 < 3 < 2 < 3 < 8 < 2 < 2 < 15 < 5 RW-6 09/30/19 < 58 < 153 < 4 < 5 < 18 < 5 < 14 < 8 < 14 < 11 < 8 < 6 < 39 < 14 VB 1-1 09/26/19 < 45 < 90 < 5 < 5 < 12 < 6 < 11 < 5 < 10 < 11 < 5 < 5 < 29 < 9 VB3-2 09/27/19 < 59 < 58 < 6 < 6 < 13 < 5 < 10 < 6 < 10 < 14 < 7 < 6 < 35 < 10 VB5-2 09/17/19 < 40 < 77 < 5 < 4 < 9 < 5 < 8 < 5 < 8 < 6 < 4 < 5 < 19 < 7 VB6-1 09/17/19 < 44 < 113 < 5 < 5 < 10 < 5 < 12 < 5 < 9 < 6 < 5 < 6 < 19 < 8 VB7-1 09/17/19 < 46 < 94 < 5 < 6 < 12 < 6 < 12 < 5 < 10 < 8 < 7 < 5 < 23 < 7 VB8-2R 09/17/19 < 54 < 142 < 8 < 6 < 10 < 7 < 11 < 6 < 10 < 8 < 7 < 5 < 23 < 11 VB9-1 09/17/19 < 50 < 68 < 5 < 7 < 14 < 7 < 14 < 7 < 10 < 8 < 7 < 8 < 33 < 5 VB'I0-1R 09/17/19 < 48 < 102 <4 < 6 < 8 < 8 < 16 < 7 < 11 < 9 < 6 < 7 < 22 < 10 vs*11-1 09117119 < 43 < 50 < 5 < 5 < 10 < 6 < 11 < 5 < 9 < 8 < 5 < 5 < 24 < 8 BOLD Values = Lab unable to meet client required detection limit due to the age of sampje at time of receipt/analysis

TABLE B-1.3 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA There were no Hard To Detect Analyses in 2019 DJ I

CTI

TABLE B-11.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, AND GROSS ALPHA IN SURFACE

\,-1'ATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Sus) offcHF.(Ds:21 o3Tos119

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zr9o DITCH F (DS-2) 06/11/19 < 193 DITCH F (DS-2) 09/30/19 < 182 < 6.2 < 0.8 < 0.7 < 1.2 DITCH F (DS-2) 10/13/19 < 187 SG-BW-102 DITCH C 03/05/19 < 197 SG-BW-102 DITCH C 06/04/19 < 194 SG-BW-102 DITCH C 09/30/19 < 179 < 5.4 < 0.9 < 1.7 < 4.8 SG-BW-102 DITCH C 10/16/19 < 186 B-6

TABLE B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2019 RESULTS IN UNITS OF PCl/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) 09/30/19 < 49 < 107 < 5 < 5 < 11 < 6 < 12 < 7 < 8 < 10 < 6 < 6 < 28 < 8 SG-BW-102 DITCH C 09/30/19 < 62 < 151 < 7 < 7 < 16 < 7 < 16 < 7 < 15 < 14 < 7 < 7 < 33 < 11 CD I

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BW200037, Annual Radiological Environmental Operating Report

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