Text

Annual Radiological Environmental Operating Report
	ML18135A086
Person / Time
Site:	Braidwood
Issue date:	05/15/2018
From:	Marchionda-Palmer M; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	BW180048
	Download: ML18135A086 (145)
	v • d • e

May 15, 2018 BW180048 ti U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 Braidwood Station, Units 1 and 2 Exelon Generation Company. LLC Braidwood Nuclear Power Station 35100 South Route 53. Suite 84 Braceville, IL 60407-9619 www.exeloncorp.com Renewed Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and STN 50-457

Subject:

2017 Annual Radiological Environmental Operating Report Attached is the 2017 Annual Radiological Environmental Operating Report for Braidwood Station. This report is being submitted in accordance with Technical Specification 5.6.2, "Annual Radiological Environmental Operating Report." This report contains information associated with the station's radiological environmental and meteorological monitoring programs. This information is consistent with the objectives described in the Offsite Dose Calculation Manual and 10 CFR 50, Appendix I, "Numerical Guides for Design Objectives and Limiting Conditions for Operation to Meet the Criterion 'As Low as is Reasonably Achievable' for Radioactive Material In Light-Water-Cooled Nuclear Power Reactor Effluents," Sections IV.B.2, IV.B.3, and IV.C. Technical Specification 5.6.2 requires the Annual Radiological Environmental Operating Report to be submitted by May 15 of each year.

If you have any questions regarding this information, please contact Marta Spillie, Regulatory Assurance Manager, at (815) 417-4833.

Respecttully,

'di/

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11 Marri Marchionda-Palmer Site Vice President Braidwood Station cc:

US NRC Regional Administrator, Region Ill US NRC Senior Resident Inspector - Braidwood Station NRR Project Manager - Braidwood Station Illinois Emergency Management Agency - Division of Nuclear Safety

Docket No:

50-456 50-457 BRAIDWOOD STATION UNIT 1 and UNIT 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2017 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Braidwood Station Braceville, IL 60407 May 2018

Intentionally left blank

Table Of Contents I. Preface............................................................................................................................. 1 II. Summary and Conclusions............................................................................................. 8 Ill. Introduction................................................................................................................... 1 O A. Objectives of the REMP..................................................................................... 10 B. Implementation of the Objectives...................................................................... 10 IV. Program Description.................................................................................................... 11 A. Sample Collection.............................................................................................. 11 B. Sample Analysis................................................................................................ 13 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. Ground/Well Water................................................................................. 18

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

5. Sediment................................................................................................. 19 B. Atmospheric Environment................................................................................. 20 1. Airborne.................................................................................................. 20

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

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

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

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

Appendix A Tables Table A-1 Appendix B Tables Table B-1 Table B-2 Figures Figure B-1 Figure B-2 Figure B-3 Appendix c Tables Table C-1.1 Table C-1.2 Table C-1.3 Table C-1.4 Table C-11.1 Table C-11.2 Appendices Radiological Environmental Monitoring Report Annual Summary Radiological Environmental Monitoring Program Annual Summary for Braidwood Station, 2017 Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2017 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2017 Inner Ring and Other OSLO Locations of Braidwood Station, 2017 Fixed Air Sampling and Outer Ring OSLO Locations of Braidwood Station, 2017 Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2017 Data Tables and Figures - Primary Laboratory Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Nickel-63 in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Gross Beta in Public Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Tritium in Public Water Samples Collected in the Vicinity of Braidwood Station, 2017 ii

Table C-11.3 Concentrations of 1-131 in Public Water Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-11.4 Concentrations of Gamma Emitters in Public Water Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-111.1 Concentrations of Tritium in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-111.2 Concentrations of Gamma Emitters in Ground/Well Water Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-IV.1 Concentrations of Nickel-63 and Gamma Emitters in Fish Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-V.1 Concentrations of Nickel-63 and Gamma Emitters in Sediment Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vl.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vl.2 Monthly and Yearly Mean Values of Gross Beta Concentrations in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vl.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vll.1 Concentrations of 1-131 in Air Iodine Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vlll.1 Concentrations of 1-131 in Milk Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-Vlll.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-IX.1 Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Braidwood Station, 2017 Table C-X.1 Quarterly OSLO Results for Braidwood Station, 2017 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, 2017 Table C-X.3 Summary of the Ambient Dosimetry Program for Braidwood Station, 2017 Figures Figure C-1 Figure C-2 Surface Water - Gross Beta - Stations BD-10 and BD-25 (Control (C))

Collected in the Vicinity of Braidwood Station, 2000 - 2017 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2007 - 2017 iii

Figure C-3 Figure C-4 Figure C-5 Figure C-6 Figure C-7 Figure C-8 Figure C-9 Figure C-10 Figure C-11 Figure C-12 Figure C-13 Figure C-14 Figure C-15 Figure C-16 Figure C-17 Figure C-18 Appendix D Tables Table D-1 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2017 Surface Water - Tritium - Stations BD-10 and BD-25 (C) Collected in the Vicinity of Braidwood Station, 2000 - 2017 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2017 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2017 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Ground/Well Water - Tritium - Stations BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2017 Ground/Well Water - Tritium - Stations BD-53 and BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2017 Air Particulate - Gross Beta - Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Air Particulate - Gross Beta - Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Air Particulate - Gross Beta - Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2017 Air Particulate - Gross Beta - Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2017 Air Particulate - Gross Beta - Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2017 Inter-Laboratory Comparison Program Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2017 iv

Table D-2 Table D-3 Appendix E Appendix F Appendix G DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services, 2017 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services, 2017 Effluent Data Errata Data 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.

Annual Reports The Nuclear Regulatory Commission (NRC) is the federal agency who has the role to protect public health and safety through the development of regulations governing nuclear power reactors and ensuring their compliance. As part of the many commitments Nuclear Power Plants have NRC to ensure this safety, they provide two reports annually to specifically address how the station's operation impacts the environment of local communities. The NRC then reviews these reports and makes them available to the public. The names of the reports are the Annual Radioactive Effluent Release Report (ARERR) and the Annual Radiological Environmental Operating Report (AREOR).

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

Graphic 1. Examples _of Gaseous _and Liquid Effluent Pathways 1

Graphic 1 demonstrates some potential exposure pathways from Braidwood Nuclear Power Station. The ARERR and AREOR together ensure Nuclear Power Plants are operating in a manner that is within established regulatory commitments meant to adequately protect the public.

Understanding Radiation Generally radiation is defined as emitted energy in the form of waves or particles.

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

Graphic 2. Types of Radiation, from NASA Hubblesite The Electromagnetic Spectrum W.vele h In meters Aboutthe size ot 11" ~4?*

Building a Graln1 Protozoan& Bacferie Molecules Atoma of &ui;par Alomlc nuclel 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 2

have eight protons. The protons are clustered with the neutrons forming the nucleus at the center of the atom. Orbiting around the nucleus are the relatively small electrons.

Isotopes are atoms that have the same number of protons but different numbers of neutrons. Different isotopes of an element will all have the same chemical properties and many isotopes are radioactive while other isotopes are not radioactive. A radioactive isotope can emit radiation because it contains excess energy in its nucleus. Radioactive atoms and isotopes are also referred to as radionuclides and radioisotopes.

There are two basic ways that radionuclides are produced at a nuclear power plant. The first is fission, which creates radionucides 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.

3

1000

!00 Activity 600 400 200 lhalf*llfc Graphic 4. Radioactive Decay Half-Life Half-life 2 half.live>

The amount of time it takes for half of the original radioactivity to decay 3 h*lf.llvc>

4 h1lf~IVC>

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 4

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

Dose equivalent (or effective dose) combines the amount of radiation absorbed and the health effects of that type of radiation. The units used within the AREOR and ARERR are the Roentgen equivalent man (rem).

Regulations require doses to the whole body, specific organ, and direct radiation to be reported in millirem (mrem), 1/1,000 of one rem.

Sources of Radiation People are exposed to radiation every day of their lives and have been since the dawn of mankind. Some of this radiation is naturally occurring while some is man-made. There are many factors that will determine the amount of radiation individuals will be exposed to such as where they live, medical treatments, etc.

The average person in the United States is exposed to approximately 620 mrem each year. Half of this exposure, 310 mrem, comes from natural sources and the other half, 310 mrem, from man-made sources. Graphic 5 shows what the typical sources of radiation are for an individual over a calendar year:

Graphic 5. Sources af Radiation Exposure in the U.S., from NCRP Repart Na. 160 Sources of Radiation Exposure In the U.S.

Terrestrial (Soil) - 3%

Internal-5%

Industrial and Occupational

<0.1%

Consumer - 2%

Natural Sources - 50%

Manmade Sources - 50%

... 310 millirem (0.31 rem)

-310 miflirem (0.31 rem)

Source: NCRP Report No. 160 {2009)

Full~ h <Miiiabie on tn.. NCRP 1"bslte at www.NCRPonlln@.orc 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.

5

Graphic 6.Relative Doses from Radiation Sources, from EPA Radiation Doses and Sources RELATIVE DOSES FROM RADIATION SOURCES All -

fn1m lhe HlltlDIUll CouftCll on Radiation Protection a M......,.....,,111, Report Ho. 160 (llnf... otherwlH deno->

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Radiation Risk Current science suggests there is some risk from any exposure to radiation.

However, it is very hard to tell whether cancers or deaths can be attributed to very low doses of radiation or by something else. U.S. radiation protection standards are based on the premise that any radiation exposure carries some risk.

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

Graphic 7. Days of Lost Life Expectancy, Adapted from the Journal of American Physicians and Surgeons Volume 8 Number 2 Summer 2003 Days of Lost Life Expectancy Smoking-Men ----------------

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

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

Cancer --------

Every 10 lbs overv>Jeight --

Stmke -

Motor Vehicle Accident -

Air Pollution I

Radon I Chemical Residue in Foods I Drowning I

Hurricanes and Tornadoes lightning Nuclear Power 0

500 1000 1500 Days of Lost Life Expectancy Hurricanes and T omadoes i

NudearPower

2000 2500 0

0.2 04 0.6 0.8 12 1.4 1.6 7

3000 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, 2017 through December 31, 2017. During that time period 1,699 analyses were performed on 1,375 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 1 OCFR61 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. Four 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 and all required LLDs (Lower Limit of Detection) were met.

Food Product samples were analyzed for concentrations of gamma-emitting nuclides. Two of thirty vegetation samples had Cs-137. The 2017 effluent data and historical trends were reviewed and positive results are consistent with Cs-137 concentrations present in background radiation from weapons testing 8

fallout.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (OSLO). Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimetry were deployed and Thermo-luminescent Dosimetry (TLD) were discontinued. This change may result in a step change in readings, up or down, depending on site characteristics. The relative comparison to control locations remains valid.

OSLO technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

9

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, 2017 through December 31, 2017.

A.

Objectives of the REMP The objectives of the REMP are to:

1.

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

2.

Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure.

B.

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

1.

Identifying significant exposure pathways

2.

Establishing baseline radiological data of media within those pathways

3.

Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment IV.

Program Description A.

Sample Collection Samples for the Braidwood Station REMP were collected for Exelon Nuclear by Environmental Inc. Midwest Labs (EIML). This section describes the general collection methods used by EIML to obtain environmental samples for the Braidwood Station REMP in 2017. 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], 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 golden redhorse, shorthead redhorse, smallmouth bass, channel catfish, quillback, common carp, and largemouth bass were collected semiannually at three locations, BD-25 (control), BD-28 and BD-41. Sediment samples composed of recently deposited substrate were collected at three locations semiannually, BD-10, BD-25 (control),

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 [control], 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 attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples 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 two locations (B0-17 and B0-18 [control]) 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 were collected annually in at five locations (BO-Control, BO-Quad 1, BO-Quad 2, BO-Quad 3 and BO-Quad 4).

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 2 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 innerring consisting of 16 locations (BD-101, BD-102, BD-103, BD-104, BD-105, BD-106, BD-107, BD-108, BD-109, BD-110, BD-111 a, BD-112, BD-113a, BD-114, BD-115 and BD-116) at or near the site boundary.

An outer ring consisting of 16 locations (BD-201, BD-202, BD-203, BD-204, BD-205, BD-206, B0-207, BD-208, BD-209, BD-210, BD-211, BD-212, BD-213, BD-214, B0-215 and BD-216) extending to approximately 5 miles from the site.

An additional (other) set consisting of seven locations (BD-02, BD-04, BD-05, BD-06, BD-19, BD-20 and BD-21).

The balance of one location (BD-03) represents the control area.

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 2017. The analytical procedures used by the laboratories are listed in Table B-2.

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

1.

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

2.

Concentrations of gamma emitters in public, ground/well and surface water, air particulates, milk, 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, ground/well water, and fish 12 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 public water, sediment, air particulate, milk and vegetation 11 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 2017, the Braidwood Station REMP had a sample recovery rate in excess of 99.8%. 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 APAI BD-20 01/05/17 No apparent reason for low reading of 161.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months WG BD-13 01/12/17 Sample not available (obtained 01/19/17)

WG BD-36 01/12/17 Sample not available - house vacant, water off (obtained 02/20/17)

Ml BD-17, 18 04/06/17 Samples lost in transit to TBE by FedEx (recollected 04/20/17)

WG BD-13 04/13/17 Sample not available due to well repair (obtained 04/20/17)

WG BD-36 04/13/17 Sample not available-house vacant, water off (obtained 04/22/17)

APAI BD-05 05/18/17 Pump exchange was overdue (due 04/18/17).

Collector checked pump and exchanged the pump on 05/18/17. Exchange date is for recommended maintenance but no signs of pump degradation were noted.

APAI BD-04 06/15/17 Low reading of 150.2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months possibly due to power outage from storms APAI BD-20 11/30/17 Temporary power outage at sampler; timer reading = 192.0; flow 61 CFH (average of previous 4 weeks) NOTE: According to the timer reading on 12/07/17, the power was out for approximately 15 minutes.

APAI BD-21 11/30/17 Temporary power outage at sampler; timer reading = 192.1; flow 60 CFH (average of previous 4 weeks) NOTE: According to the timer reading on 12/07/17, the power was out for approximately 15 minutes.

APAI BD-04 12/28/17 No apparent reason for low reading of 121.1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months ; timer working properly. NOTE: Timer reading on 01/04/18 was normal.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Code Collection Reason Type Date WT BD-55,56 01/05/17 No sample; water frozen WT BD-10,55,56 01/12/17 No sample; water frozen WT BD-56 02/02/17 No sample; water frozen WT BD-56 02/09/17 No sample; water frozen OSLO B0-106-1 03/30/17 OSLO found missing during quarterly exchange; collector placed new 2nd quarter APAI ALL 04/06/17 Samples lost by FedEx in transit to TBE; tracked to Louisville, TN hub; FedEx unable to locate cooler after this point OSLO B0-215-2 06/29/17 OSLO found missing during quarterly exchange; collector replaced with new 3rd quarter OSLO OSLO B0-206-2 12/07/17 OSLO found missing during monthly visual check; WT WT OSLO was replaced with a spare, however spare was not processed by dosimetry vendor B0-25,56 12/14/17 No sample; water frozen BD-25,38,55,56 12/28/17 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 was a program change to the frequency of vegetation samples requested. EIML will collect samples continuously during the growing season (June-October) instead of the one-time harvest sample check.

This change will be documented in an ODCM revision scheduled for 2018.

Due to past issues with food products sampling, Braidwood Station instituted sampling from an onsite garden in 2016, on a trial basis. This sampling was not continued in 2017. However, the Station intends to implement this additional food product sampling by including this onsite sampling plan in the pending ODCM change.

IV.

Results and Discussion A.

Aquatic Environment

1.

Surface Water Samples were taken weekly and composited monthly at six locations (BD-10, BD-25 (control), 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 62 of 72 samples. The values ranged from 2.7 to 11.6 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 one sample. The value was 216 pCi/L. Concentrations detected were consistent with those detected in previous years (Figures C-4 through C-6, Appendix C).

Nickel-63 Monthly samples were analyzed for Ni-63 activity (Table C-1.3, Appendix C). Ni-63 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 other required LLDs were met.

2.

Public Water 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 8 of 12 samples. The values ranged from 2. 7 to 5.4 pCi/L.

Concentrations detected were consistent with those detected in previous years (Figure C-7, Appendix C).

Tritium Monthly composites of weekly samples from BD-22 were analyzed for tritium activity (Table C-11.2, Appendix C). Tritium was detected in 11 of 12 samples. Concentrations ranged from 208 to 1,540 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.

Gamma Spectrometry Samples from the location were analyzed for gamma-emitting nuclides (Table C-11.4, Appendix C). No nuclides were detected and all required LLDs were met.

3.

Ground/Well Water 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 golden redhorse, shorthead redhorse, smallmouth bass, channel catfish, quillback, common carp, and largemouth bass were collected at three locations (BD-25, BD-28, and BD-41) semiannually. Location BD-28 could be affected by Braidwood Station's effluent releases. The following analyses were performed:

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 Aquatic sediment samples were collected at three locations (BD-10, BD-25, and BD-57) semiannually. The locations at the Braidwood Station outfall to the Kankakee River and downstream of the outfall, could be affected by Braidwood Station's effluent releases. The following analyses were performed:

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). Concentrations of the fission product Cs-137 were found at all three locations. The concentrations ranged from 88 +/- 60 pCi/kg dry to 164 +/- 72 pCi/kg dry. These concentrations of Cs-137 were less than the required Cs-137 in sediment LLD 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

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 7E-03 to 36E-03 pCi/m3 with a mean of 17E-03 pCi/m3. The results from the far field (Group II) ranged from 6E-03 to 31 E-03 pCi/m3 with a mean of 17E-03 pCi/m3. The results from the Control location (Group Ill) ranged from 7E-03 to 30E-03 pCi/m3 with a mean of 16E-03 pCi/m3. Comparison of the 2017 air particulate data with previous years' data indicate no effects from the operation of Braidwood Station. Additionally, a comparison of the weekly mean values for 2017 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:

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 1-131. The required LLD was met for all analyses.

C.

Terrestrial Environment

1.

Milk Samples were collected from two locations (BD-17 and control location BD-18). Sampling frequencies were increased to biweekly in May and continued through October and monthly sampling was performed November through April. The following analyses were performed:

lodine-131 Milk samples from the indicator location were analyzed for concentrations of 1-131 (Table C-Vlll.1, Appendix C). lodine-131 was not detected in any samples. All required LLDs were met.

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma-emitting nuclides (Table C-Vlll.2, Appendix C). No nuclides were detected and all required LLDs were met.

2.

Food Products Food product samples were collected at five locations that could be affected by Braidwood Station's effluent releases: BO-Control, BO-Quad 1, BO-Quad 2, BO-Quad 3 and BO-Quad 4 when available. The following analysis was performed:

Gamma Spectrometry Samples from all locations were analyzed for gamma-emitting nuclides (Table C-IX.1, Appendix C). Concentrations of Cs-137 were found at two locations. One of these samples was a root vegetable and the other was a leaf vegetable that contained dirt in the sample. The concentrations ranged from 35 +/- 23 pCi/kg wet (leafy vegetable) to 124 +/- 33 pCi/kg wet (root vegetable). Gaseous and liquid effluent data were reviewed for 2017 and showed no Cs-137 values above LLD concentrations. Visual inspection of both samples with positive results showed trace amounts of soil were present during analysis. The results are below the expected fallout concentrations of sediment for Braidwood calculated using NCRP Report 154. Additionally, these results were trended against historical vegetation, soil, and sediment results and were consistent with previous positive results. No other nuclides were detected and all required LLDs were met.

D.

Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Optically Stimulated Luminescence Dosimeter (OSLO). 90 OSLO locations were established around the site. Results of OSLO measurements are listed in Tables C-X.1 to C-X.3, Appendix C.

Most OSLO measurements were below 30 mrem/quarter, with a range of 17.3 to 42.1 mrem/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.

The highest ISFSI location on site, BD-105-4, averaged 36.6 mrem/quarter vs. 20.3 mrem/quarter for BD-03-1 and 21.4 mrem/quarter for BD-03-2. This difference is statistically significant. Dose was assessed in the ARERR to the nearest resident and was found to be 0.34 mrem for the year.

E.

Land Use Survey A Land Use Survey conducted during August 2017 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. The only changes identified between the 2017 survey and the previous year's survey were related to livestock. Three sectors (ENE, S, SW) that were previously had beef cattle, had no cattle in the 2017 survey. There were no changes required to the Braidwood Station REMP as a result of this survey. The results of this survey are summarized below:

Distance in Miles from the Braidwood Station Reactor Buildings Sector Residence Livestock Milk Farm Miles Miles Miles (A) N (B) NNE (C) NE (D) ENE (E) E (F) ESE (G) SE (H) SSE (J) s (K) SSW (L) SW (M)WSW (N)W (P)WNW (Q)NW (N)W (P)WNW (Q)NW F.

Errata Data 0.50 2.6 0.88 0.65 0.75 1.50 2.20 2.70 4.50 4.20 1.30 0.40 0.45 0.35 0.40 0.40 0.7 0.7 0.7 2.3 2.3 2.7 5.3 1.6 There was no errata data for 2017.

G.

Summary of Results - Inter-Laboratory Comparison Program 5.5 8.7 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, 168 out of 173 analyses performed met the specified acceptance criteria. Five analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program.

1. The ERA April 2017 two nuclides in water were evaluated as Not Acceptable. (NCR 17-09)

a.

The Zn-65 result of 39.3 pCi/L, exceeded the lower acceptance limit of 47.2. The known value was unusually low for this study.

The sample was run in duplicate on two different detectors. The results of each were 39.3 +/- 18.2 pCi/L (46% error and lower efficiency) and 59.3 +/- 8.23 pCi/L (13.9% error and higher efficiency). The result from the 2nd detector would have been well within the acceptable range (47.2 - 65.9) and 110.2% of the known value of 53.8 pCi/L.

b. The Sr-89 result of 40.7 pCi/L exceeded the lower acceptance limit of 53.8. All associated QC and recoveries were reviewed and no apparent cause could be determined for the failure.

The prior three cross-check results were from 99 - 115% of the known values and the one that followed this sample (November, 2017) was 114% of the known value.

2. The DOE MAPEP August 2017 air particulate U-238 result of 0.115 +/-

0.025 Sq/sample was higher than the known value of 0.087 +/- 0.002 with a ratio of 1.32, therefore the upper ratio of 1.30 (acceptable with warning) was exceeded. TBE's result with error easily overlaps with the acceptable range. MAPEP does not evaluate results with any associated error. Also, the spike level for this sample was very low (2.35 pCi) compared to TBE's normal LCS of 6 pCi. TBE considers this result as passing. (NCR 17-15)

3. The Analytics September 2017 soil Cr-51 result was evaluated as Not Acceptable (Ratio of TBE to known result at 0.65). The reported value was 0.230 +/- 0.144 pCi/g and the known value was 0.355 +/- 0.00592 pCi/g. The sample was counted overnight for 14 hours1.62037e-4 days 0.00389 hours 2.314815e-5 weeks 5.327e-6 months , however the Cr-51 was spiked at a very low level and had a counting error of 65%.

Cr-51 has a 27-day half-life, making low-level quantification even more difficult. The error does not appear to have been taken into consideration for this result. If it had been evaluated with the error, the highest result would have been 105% of the reference value, which is acceptable. Also, the known value is significantly lower than TBE's typical MDC for this nuclide in a soil matrix and would typically not be reported to clients (unless specified). The results of all of the previous cross-checks have been in the acceptable (80 - 120%) range. TBE will evaluate further upon completion of the next ICP sample. (NCR 17-16)

4. The ERA November 2017 water Sr-90 sample was evaluated as Not Acceptable. TBE's result of 27.1 pCi/L exceeded the lower acceptance range (30.8 - 48.0 pCi/L). After reviewing the associated QC data for this sample, it was determined that although the spike recovery for Sr-90 was within our laboratory guidelines (70% -130%), both the spike result and our ERA result were biased low. The original cross-check sample was completely consumed and we were unable to reanalyze before submitting the result. We have modified our preparation process to avoid this situation for future cross-check samples. We also have enhanced LIMS programming to force a LCSD when a workgroup includes cross-check samples (as opposed to running a DUP).

(NCR 17-19)

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, 2017 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS:

50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD:

2017 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)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 72 4

5.5 4.5 8.5 80-40 INDICATOR 0

(PCllLITER)

(53/60)

(9/12)

(12112)

BRAIDWOOD STATION COOLING LAKE 2.7-11.6 3.3-6.2 5.1 - 11.6 ONSITE H-3 24 200 216

<LLD 216 80-10 INDICATOR 0

(1/20)

(1/4)

KANKAKEE RIVER DOWNSTREAM 5.4 MILES NE OF SITE Nl-63 72 30

<LLD

<LLD 0

)>

GAMMA 72 I

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-B 12 4

3.3 NA 3.3 BD-22 INDICATOR 0

(PCl/LITER)

(8/12)

WILMINGTON 2.7 - 5.4 2.7-5.4 6.0 MILES NE OF SITE H-3 12 200 614 NA 614 BD-22 INDICATOR 0

(11/12)

WILMINGTON 208-1540 208-1540 6.0 MILES NE OF SITE 1-131 12 1

<LLD NA 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 MOl\\JITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2017 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS:

50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD:

2017 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)

STATION#

NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS PUBLIC WATER GAMMA 12 (PCllLITER)

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

I I\\)

LA-140 15

<LLD NA 0

GROUND WATER H-3 32 200

<LLD NA 0

(PC I/LITER)

GAMMA 32 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 Nl-63 12 260

<LLD

<LLD 0

(PCllKG WET)

(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, 2017 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS:

50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD:

2017 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)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH GAMMA 12 (PCllKG 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

I w BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

SEDIMENT Nl-63 6

260

<LLD

<LLD 0

(PCl/KG DRY)

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-137 180 128 96 148 BD-10 INDICATOR 0

(3/4)

(1/2)

(2/2)

KANKAKEE RIVER DOWNSTREAM 88-164 131 - 164 5.4 MILES NE OF SITE BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2017 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS:

50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD:

2017 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)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GR-B 416 10 17 16 17 BD-04 INDICATOR 0

(E-3 PC/ICU.METER)

(364/364)

(52/52)

ESSEX 6-36 7-30 6-31 4.8 MILES SSE 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

~

CS-134 so

<LLD

<LLD 0

CS-137 60

<LLD

<LLD 0

BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

AIR IODINE GAMMA 416 (E-3 PC/ICU.METER) 1-131 70

<LLD

<LLD 0

MILK 1-131 38 1

<LLD

<LLD 0

(PC/JUTE R)

GAMMA 38 MN-54 NA

<LLD

<LLD 0

C0-58 NA

<LLD

<LLD 0

FE-59 NA

<LLD

<LLD 0

C0-60 NA

<LLD

<LLD 0

ZN-65 NA

<LLD

<LLD 0

NB-95 NA

<LLD

<LLD 0

ZR-95 NA

<LLD

<LLD 0

CS-134 15

<LLD

<LLD 0

CS-137 18

<LLD

<LLD 0

BA-140 60

<LLD

<LLD 0

LA-140 15

<LLD

<LLD 0

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

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR BRAIDWOOD STATION, 2017 NAME OF FACILITY: BRAIDWOOD DOCKET NUMBERS:

50-456 & 50-457 LOCATION OF FACILITY: BRACEVILLE, IL REPORTING PERIOD:

2017 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 (UN/TOF ANALYSIS ANALYSIS OF DETECTION (F)

(F)

NAME REPORTED MEASUREMENT)

PERFORMED PERFORMED (LLD)

RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS VEGETATION GAMMA 30 (PCl!KG WET)

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 60

<LLD

<LLD 0

CS-137 80 77.9

<LLD 124 8D-QUAD4 INDICATOR 0

)>

(2/26)

(116)

BRUCE SINKULAR I

CJl 34.9-124.2 124 1.9 MILES NNW OF SITE BA-140 NA

<LLD

<LLD 0

LA-140 NA

<LLD

<LLD 0

DIRECT RADIATION OSLD-QUARTERL Y 341 NA 20.9 20.8 36.6 BD-105-4 INDICATOR 0

(MILLIREMIQTR.)

(332/332)

(818)

(414) 16.9-42.1 18.2 -22.4 29.3-42.1 0.20 MILES SE (M) The Mean Values are calculated using the positive values. (F) Fraction ol detectable measurement are indicated in parentheses.

Intentionally left blank

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

TABLE B-1:

Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2017 Location A.

Surface Water BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 Location Description Kankakee River Downstream (indicator)

Kankakee River Upstream (control)

Main Drainage Ditch (indicator)

Braidwood Station Cooling Lake (indicator)

North Pond Fatlan Site (indicator)

South Pond Fatlan Site (indicter)

B.

Drinking (Potable) Water BD-22 C.

Ground/Well Water BD-13 BD-34 BD-35 BD-36 BD-37 BD-50 BD-51 BD-54 Wilmington (indicator)

Braidwood City Hall Well (indicator)

Gibson Well (indicator)

Joly Well (indicator)

Hutton Well (indicator)

Nurczyk Well (indicator)

Skole Well (indicator)

Fatlan Well (indicator)

Cash Well (indicator)

D.

Milk - bi-weekly I monthly BD-17 BD-18 Halpin's Dairy (indicator)

Biros' Farm (control)

E.

Air Particulates I Air Iodine BD-02 BD-03 BD-04 BD-05 BD-06 BD-19 BD-20 BD-21 F.

Fish BD-25 BD-28 BD-41 G.

Sediment BD-10 BD-25 BD-57 Custer Park (indicator)

County Line Road (control)

Essex (indicator)

Gardner (indicator)

Godley (indicator)

Nearsite NW (indicator)

Nearsite N (indicator)

Nearsite NE (indicator)

Kankakee River, Upstream (control)

KMkakee River, Discharge (indicator)

Cooling Lake (indicator)

Kankakee River, Downstream (indicator)

Kankakee River Upstream (control)

Circulating Water Slowdown Discharge (indicator)

B-1 Distance & Direction From Site 5.4 miles NE 9.6 miles E 1.5 miles SE Onsite 0.6 miles NE 0.6 miles NE 6.0 miles NE 1.7 miles NNE 4.7 miles E 4.7 miles E 4.7 miles E 4.7 miles E 4.7 miles E 0.6 miles NE 0.9 miles NE 5.5 miles SSW 8.7 milesW 5.0 miles E 6.2 miles ESE 4.8 miles SSE 5.5 miles SW 0.5 miles WSW 0.3miles NW 0.6 miles N 0.5 miles NE 9.6 miles E 5.4 miles E 1.0 mile E 5.4 miles NE 9.6 miles E 5.4 miles E

TABLE B-1:

Location H.

Food Products Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4 Control Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2017 Location Description Clark Farm W.F. Soltwisch Terri Schultz Bruce Sinkular Gorman Farm Distance & Direction From Site 3.8 miles ENE 4.5 miles SSE 4.8 miles SSW 1.9 miles NNW 9.0 miles NE I.

Environmental Dosimetry - OSLD Inner Ring BD-101-3 and -4 BD-102-1 and -2 BD-103-1 and -2 BD-104-1 and -2 BD-105-1 and -2 BD-106-1 and -2 BD-107-1 and -2 BD-108-1 and -2 BD-109-1 and -2 BD-110-1 and-2 BD-111a-1 and-2 BD-112-1 and-2 BD-113a-1 and -2 BD-114-1 and -2 BD-115-1 and -2 BD-116-1 BD-116-2 Outer Ring BD-201-1 and -2 BD-202-1 and -2 BD-203-1 and -2 BD-204-1 and -2 BD-205-1 and -2 BD-206-1 and -2 BD-207-1 and -2 BD-208-1 and -2 BD-209-1 and -2 BD-210-1 and -2 BD-211-1 and -2 BD-212-3 and -4 BD-213-3 and -4 BD-214-1 and -2 BD-215-1 and -2 BD-216-1 and -2 Other BD-02-1 and -2 BD-04-1 and -2 BD-05-1 and -2 BD-06-1 and -2 BD-19-1 and -2 Custer Park (indicator)

Essex (indicator)

Gardner (indicator)

Godley (indicator)

Nearsite NW (indicator)

B-2 0.5 miles N 1.1 miles NNE 1.0 mile NE 0.7 miles ENE 2.2 miles E 2.5 miles ESE 3.2 miles SE 3.2 miles SSE 3.8 miles S 2.8 miles SSW 1.4 miles SW 0.7 miles WSW 0.5 miles W 0.4 miles WNW 0.3 miles NW 0.4 miles NNW 0.5 miles NNW 4.2 miles N 4.8 miles NNE 4.9 miles NE 4.3 miles ENE 4.0 miles E 4.5 miles ESE 4.5 miles SE 4.5 miles SSE 4.8 miles S 5.3 miles SSW 4.8 miles SW 5.0 miles WSW 4.8 miles W 4.3 miles WNW 4.5 miles NW 4.0 miles NNW 5.0 miles E 4.8 miles SSE 5.5miles SW 0.5milesWSW 0.3 miles NW

TABLE B-1:

Location Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Braidwood Station, 2017 Location Description Distance & Direction From Site I.

Environmental Dosimetry-OSLD (cont'd)

Other (cont'd)

BD-20-1 and -2 BD-21-1 and -2 Control BD-03-1 and -2 ISFSI BD-104-3 and -4 BD-105-3 and -4 BD-110-3 and -4 Sector (N) W (P) WNW (Q) NW (R) NNW Sector (A) N (B) NNE (C) NE (D) ENE (E) E (F) ESE (G) SE (H) SSE (J) s (K) SSW (L) SW (M) WSW (N) W (P) WNW (Q) NW (R) NNW Nearsite N (indicator)

Nearsite NE (indicator) 13000 W. Road 0.6 miles N 0.5 miles NE 6.2 miles ESE 0.12 miles E 0.22 miles SE 0.17 miles SE Distance in Miles from the Braidwood Station ISFSI Pad, 2017 Residence Miles 0.7 0.7 0.7 0.7 Distance in Miles from the Braidwood Station Reactor Buildings, 2017 Residence Livestock Milk Farm Miles Miles Miles 0.5 2.6 0.9 0.7 0.8 3.3 1.5 2.3 2.2 2.3 2.7 2.7 4.5 4.2 4.8 1.3 5.3 5.5 0.4 1.2 0.5 0.4 1.6 8.7 0.4 0.4 0.4 B-3

TABLE B-2:

Sample Medium Surface Water Surface Water Surface Water Surface Water Drinking Water Drinking Water Drinking Water Drinking Water Ground/

Well Water Ground/

Well Water Fish Fish Sediment Sediment Air Particulates Air Particulates Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2017 Analysis Sampling Method Analytical Procedure Number Gamma Monthly composite from weekly grab TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy samples.

Gross Beta Monthly composite from weekly grab TBE, TBE-2008 Gross Alpha and/or Gross Beta activity samples.

in various matrices Tritium Quarterly composite from weekly grab TBE, TBE-2011 Tritium analysis in drinking water by samples.

liquid scintillation Nickel-63 Monthly composite from weekly grab TBE, TBE-2013 Radionickel activity in various matrices samples.

Gross Beta Monthly composite from weekly TBE, TBE-2008 Gross Alpha and/or Gross Beta activity composite samples.

in various matrices Gamma Monthly composite from weekly TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy composite samples.

Tritium Monthly composite from weekly TBE, TBE-2011 Tritium analysis in drinking water by composite samples.

liquid scintillation Iodine Monthly composite from weekly TBE, TBE-2031 Radioactive Iodine in drinking water composite samples.

Gamma Quarterly grab samples.

TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Tritium Quarterly grab samples.

TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation Nickel-63 Semi-annual samples collected via TBE, TBE-2013 Radionickel activity in various matrices electroshocking or other techniques Gamma Samples collected twice annually via Spectroscopy electro-shocking or TBE-2007 Gamma emitting radioisotope analysis other techniques Gamma Semi-annual grab samples TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Nickel-63 Semi-annual grab samples TBE, TBE-2013 Radionickel activity in various matrices Gross Beta One-week composite of continuous air TBE, TBE-2008 Gross Alpha and/or gross beta activity in sampling through glass fiber filter paper various matrices Gamma Quarterly composite of each station TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy B-4

TABLE B-2:

Sample Medium Air Iodine Milk Milk Food Products OSLD Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Braidwood Station, 2017 Analysis Sampling Method Analytical Procedure Number 1-131 Weekly composite of continuous air TBE, TBE-2007 Gamma emitting radioisotope analysis sampling through charcoal filter 1-131 Bi-weekly grab sample May through TBE, TBE-2012 Radioiodine in various matrices October. Monthly all other times Gamma Bi-weekly grab sample May through TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy October. Monthly all other times Gamma Annual grab samples.

TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Optically Quarterly OSLDs comprised of two Stimulated Luminescence Al203:C Landauer Incorporated Landauer Incorporated Dosimetry elements.

8-5

N I

~!

1m:~

~aidwood i~~.110-Station 104-4:LJ.110-4 ISFSI Pad l*~N5Wt'Y -----'I

~ii OSLO Locations Figure B-1 Inner Ring and Other OSLO Locations of Braidwood Station, 2017 8-6 Ll13

K t Cl 1

~

3 4

5 W111it::lwll~t::t'*11t:' =:t'*111t' =::rft.mu OSLD Locations e Ax.s~

LoelbOU Figure B-2 Fixed Air Sampling and Outer Ring OSLD Locations of Braidwood Station, 2017 B-7

- ii 3

l'f t

0 t

2 w 1111 I

enidwood

)(

3 4

I I

17 5 I a1ues

.s Braidwood St11fH)n a.;:)

M

~

Figure B-3 1Lll3 Counly liAtt Rd OFFSITE DOSE CALCULA'llON MANUAL BRAIDWOOD STATION FIGURE 11*3 JJ.;(}fnlOW Al~D WATERBOflt4£ llXPOStJRi PATHWAY SAMPLE'. LOCATIONS Wa:er 4l Sediment e fi:ih X Milk Ingestion and Waterborne Exposure Pathway Sample Locations of Braidwood Station, 2017 B-8

Intentionally left blank

APPENDIX C DATA TABLES AND FIGURES PRIMARY LABORATORY

Intentionally left blank

Table C-1.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/05/17 - 01/26/17 2.9 +/- 1.7 5.1 +/- 1.9 4.4 +/- 2.2 9.2 +/- 2.5 3.6 +/- 1.5 5.6 +/- 1.9 02/02/17 - 02/23/17

< 2.8

< 2.9 3.3 +/- 2.2 7.8 +/- 2.5

< 2.5

< 3.0 03/02/17 - 03/30/17 6.0 +/- 1.9 4.4 +/- 1.8 5.8 +/- 2.1 7.3 +/- 2.2 4.2 +/- 1.6 3.3 +/- 1.8 04/06/17 - 04/27/17 3.6 +/- 2.0 3.3 +/- 2.0 6.9 +/- 2.5 7.7 +/- 2.4 2.7 +/- 1.7

< 3.0 05/04/17 - 05/25/17 2.9 +/- 1.8 3.7 +/- 1.8 3.5 +/- 2.2 5.1 +/- 2.1 2.7 +/- 1.6 3.7 +/- 1.9 06/01/17 - 06/29/17 5.0 +/- 1.7 5.1 +/- 1.7 6.3 +/- 2.2 8.3 +/- 2.1 3.8 +/- 1.5 7.2 +/- 2.0 07/06/17 - 07/27/17 3.9 +/- 2.1

< 2.9 5.0 +/- 2.8 8.9 +/- 2.6 2.8 +/- 1.8 3.8 +/- 2.0 08/03/17 - 08/31/17 4.7 +/- 2.0 5.4 +/- 2.0 7.0 +/- 2.9 10.6 +/- 2.6 4.2 +/- 1.6 5.9 +/- 2.2 09/07/17 - 09/28/17 3.0 +/- 1.8 3.5 +/- 1.9 7.8 +/- 3.1 7.6 +/- 2.4 3.1 +/- 1.6

< 2.6 10/05/17 - 10/26/17

< 2.2 3.7 +/- 1.8 4.7 +/- 2.1 9.2 +/- 2.3 2.7 +/- 1.6

< 2.8 11/02/17 - 11/30/17 5.9 +/- 2.0 6.2 +/- 2.1 7.6 +/- 2.8 11.6 +/- 2.7 5.3 +/- 1.7 4.5 +/- 2.1 12/07 /17 - 12/28/17 3.5 +/- 2.0

< 2.7 6.7 +/- 2.7 8.1 +/- 2.4 3.1 +/- 1.5 5.8 +/- 2.2 MEAN+/- 2 STD DEV 4.1 +/- 2.4 4.5 +/- 2.0 5.7 +/- 3.1 8.5 +/- 3.3 3.5 +/- 1.7 5.0 +/- 2.7 Table C-1.2 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/05/17 - 03/30/17

< 192

< 191

< 197

< 189

< 193 04/06/17 - 06/29/17

< 177

< 175

< 177

< 176

< 174

< 172 07/06/17 - 09/28/17

< 191

< 189

< 187

< 191

< 189

< 189 10/05/17 - 12/28/17 216 +/- 130

< 195

< 194

< 198

< 192

< 196 MEAN Table C-1.3 CONCENTRATIONS OF NICKEL-63 IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PC I/LITER+/- 2 SIGMA COLLECTION PERIOD BD-10 BD-25 BD-38 BD-40 BD-55 BD-56 01/05/17 - 01/26/17

< 5

< 16

< 4

< 5

< 4

< 6 02/16/17 - 02/23/17

< 26

< 24

< 23

< 24

< 23 03/02/17 - 03/30/17

< 18

< 19

< 16

< 17

< 18 04/06/17 - 04/27/17

< 5

< 15

< 5 05/04/17 - 05/25/17

< 13

< 13 06101 /17 - 06/29/17

< 15

< 14

< 15

< 17 07/06/17 - 07/27/17

< 14

< 15

< 14

< 14 08/03/17 - 08/31 /17

< 14

< 16

< 17

< 16

< 16 09/07/17 - 09/28/17

< 12

< 13 10/05/17 - 10/26/17

< 18

< 14

< 18

< 17

< 15 11 /02/17 - 11 /30/17

< 16

< 25

< 24

< 15

< 15 12/07/17 - 12/28/17

< 19

< 20

< 19

< 18

< 20 MEAN THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-1

0 I I\\)

Table C-1.4 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 COLLECTION SITE PERIOD BD-10 01/05/17 - 01/26/17 02102117 - 02/23/17 03/02117 - 03/30/17 04/06/17 - 04/27/17 05/04/17 - 05/25/17 06/01/17 - 06/29/17 07/06/17 - 07/27/17 08/03/17 - 08/31/17 09/07 /17 - 09/28/17 10/05/17 - 10/26/17 11/02/17 - 11/30/17 12107/17 - 12/28/17 MEAN BD-25 01/05/17 - 01/26/17 02/02/17 - 02/23/17 03/02/17 - 03/30/17 04/06/17 - 04/27/17 05/04/17 - 05/25/17 06/01/17 - 06/29/17 07/06/17 - 07/27/17 Mn-54

<4

<2

<4

<2

<4

< 3

< 1

< 3

< 2

< 5

< 3

< 6

< 3

<6

< 3

<2

<4

< 3 08/03/17 - 08/31/17

< 1 09/07/17 - 09/28/17

< 2 10/05/17 - 10/26/17

< 2 11/02/17 - 11/30/17

< 7 12107/17 - 12/21/17 (I)

< 2 MEAN BD-38 01/05/17 - 01/26/17

< 5 02102117 - 02/23/17

< 2 03/02/17 - 03/30/17

< 6 04/06/17 - 04/27/17

< 3 05/04/17 - 05/25/17

< 2 06/01/17 - 06/29/17

< 5 07/06/17 - 07/27/17

< 3 08/03/17 - 08/31/17

< 1 09/07/17 - 09/28/17

< 3 10/05/17 - 10/26/17

< 2 11/02/17 - 11/30/17

< 5 12107/17 - 12/21/17

(!)

< 2 MEAN Co-58

<4

<2

<6

<2

< 5

< 3

< 2

<4

< 3

< 6

< 3

<6

< 3

<6

< 3

<2

<6

< 2

<2

< 2

< 7

<2

<6

<2

< 7

< 3

< 2

< 5

< 3

< 2

< 3

<2

<4

< 2 Fe-59

< 8

<4

< 13

< 5

< 10

< 6

< 4

< 7

< 5

< 12

< 7

< 11

< 6

< 12

< 7

< 5

< 10

< 6

<4

< 6

< 13

< 5

< 10

< 5

< 12

< 6

< 5

< 14

< 7

< 3

< 8

< 6

< 13

< 5 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION RESULTS IN UNITS OF PCllLITER +/- 2 SIGMA Co-60

<4

< 2

< 6

< 2

< 4

< 3

< 1

< 3

< 5

<4

<7

< 3

< 6

< 3

< 2

<4

< 3

< 1

<2

<7

<2

< 5

< 2

< 5

< 3

< 2

< 5

< 3

<2

< 3

< 2

<6

< 2 Zn-65

< 9

<4

< 11

<4

< 10

< 6

< 3

< 6

< 5

< 12

<6

< 12

< 5

< 12

<6

<4

< 11

< 5

< 3

< 5

<4

< 14

<4

< 11

<4

< 11

< 6

<4

< 11

< 6

< 3

< 7

<4

< 12

<4 Nb-95

< 5

< 2

<6

< 2

< 5

< 3

< 2

< 3

< 6

< 4

< 6

< 3

< 7

< 3

< 2

< 6

< 3

< 2

< 3

< 5

< 2

< 6

< 3

< 7

< 3

< 2

< 5

< 4

< 2

<4

< 2

< 6

< 3 Zr-95

< 7

< 3

< 10

<4

< 8

< 6

< 3

< 6

< 4

< 11

< 7

< 10

< 5

< 11

< 5

<4

< 9

< 5

< 3

<4

< 11

<4

< 10

<4

< 11

< 5

<4

< 11

< 5

< 3

< 6

<4

< 10

<4 1-131

< 10

< 8

< 14

< 8

< 11

< 15

< 9

< 14

< 13

< 15

< 11

< 14

< 11

< 15

< 10

< 12

< 15

< 8

< 14

< 10

< 13

< 12

< 15

< 10

< 14

< 9

< 11

< 15

< 9

< 14

< 15

< 12

< 15

< 13 Cs-134

<4

< 2

< 5

< 2

< 5

< 3

< 2

< 3

<6

< 3

<4

< 3

< 6

< 3

< 2

<6

< 3

< 2

<2

< 3

<7

<2

< 5

< 2

< 7

< 3

< 2

< 6

<4

< 1

< 3

<2

<6

<2 Cs-137

<4

< 2

< 6

< 2

< 5

< 3

< 2

< 3

< 2

< 6

< 3

< 5

< 3

< 7

< 3

< 2

< 5

< 3

< 1

< 2

< 6

<2

< 5

< 2

< 6

< 3

< 2

< 5

< 3

< 2

< 3

< 2

< 6

< 2 Ba-140

< 27

< 15

< 32

< 17

< 19

< 31

< 21

< 20

< 27

< 21

< 34

< 24

< 32

< 23

< 33

< 20

< 21

< 37

< 18

< 21

< 19

< 22

< 36

< 19

< 37

< 19

< 43

< 18

< 21

< 29

< 20

< 27

< 19

< 37

< 22 La-140

< 9

< 5

<9

<5

<6

<7

< 6

< 7

< 10

< 8

< 12

< 8

<7

< 7

< 10

< 5

< 7

< 6

<6

< 14

<7

< 11

<6

< 8

<6

< 6

< 13

< 7

< 9

<6

< 12

< 8

(')

I (A)

Table C-1.4 SITE COLLECTION PERIOD BD-40 01/05/17 - 01/26/17 02102/17 - 02/23/17 03/02/17 - 03/30/17 04/06/17 - 04127117 05/04/17 - 05/25/17 06/01/17 - 06/29/17 07 /06/17 - 07127117 08/03/17 - 08/31/17 09/07 /17 - 09/28/17 10/05/17 - 10/26/17 11/02/17 - 11/30/17 12107/17 - 12/28/17 MEAN BD-55 01/19/17 - 01/26/17 02/02/17 - 02/23/17 03/02/17 - 03/30/17 04/06/17 - 04/27 /17 05/04/17 - 05/25/17 06/01/17 - 06/29/17 07/06/17 - 07/27/17 08/03/17 - 08/31/17 09/07 /17 - 09/28/17 10/05/17 - 10/26/17 11/02/17 - 11/30/17 12/07/17 - 12/21/17 MEAN BD-56 01/19/17 - 01/26/17 02/16/17 - 02/23/17 03/02/17 - 03/30/17 04/06/17 - 04/27/17 05/04/17 - 05/25/17 06/01/17 - 06/29/17 07/06/17 - 07/27/17 08/03/17 - 08/31/17 09/07/17 - 09/28/17 10/05/17 - 10/26/17 11/02/17 - 11/30/17 12/07/17 - 12/21/17 MEAN CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 Mn-54

< 5

< 2

<4

< 3

< 2

< 5

< 2

< 1

< 3

< 5

<4

< 5

< 3

< 6

< 2

< 5

<4

< 1

< 3

<2

<4

< 2

<6

< 3

< 5

< 3

<2

< 5

< 3

< 1

< 3

< 2

<4

< 2 Co-58

<4

< 2

<4

< 3

< 5

< 3

< 2

< 3

<4

< 5

< 3

< 7

< 3

<6

<4

< 2

< 3

<4

< 3

< 7

< 3

< 5

< 3

<2

<6

<4

<2

< 3

< 5

<2 Fe-59

< 10

< 6

< 8

< 6

< 10

< 6

< 4

< 7

< 6

< 11

< 8

< 10

< 7

< 10

< 6

< 11

< 8

<4

< 7

< 6

< 9

< 6

< 12

< 7

< 10

< 6

< 5

< 13

< 8

<4

< 6

< 5

< 12

< 5 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Co-60

< 6

< 2

<4

< 3

< 2

< 6

< 3

< 1

< 3

< 5

<4

< 5

< 3

< 6

< 3

< 2

< 6

<4

< 1

< 3

<2

< 5

< 3

< 6

< 3

< 5

< 3

< 2

< 6

< 3

< 1

< 3

<2

< 6

< 2 Zn-65

< 12

< 5

< 8

< 7

< 5

< 10

<6

< 3

<6

< 11

< 9

< 10

< 5

< 12

< 5

< 11

<7

< 3

<6

< 5

< 9

< 5

< 11

<6

< 8

<6

< 5

< 8

< 7

< 3

< 5

<4

< 10

< 4 Nb-95

< 6

< 3

<4

< 4

< 3

<6

< 3

< 2

< 3

< 5

< 4

< 6

< 3

< 7

< 3

< 5

<4

< 2

<4

< 3

< 5

< 3

< 6

<4

< 5

< 3

< 5

<4

< 2

< 3

< 5

< 2 Zr-95

< 9

< 5

< 7

< 6

< 5

< 9

< 5

< 3

< 5

< 9

<6

< 10

< 5

< 10

< 5

<4

< 10

<7

< 3

<6

< 5

< 9

< 5

< 11

< 6

< 8

< 5

< 9

< 6

< 3

< 5

< 9

<4 1-131

< 12

< 11

< 13

< 14

< 8

< 15

< 14

< 10

< 13

< 14

< 9

< 13

< 15

< 10

< 15

< 12

< 14

< 15

< 14

< 12

< 10

< 13

< 15

< 11

< 15

< 14

< 13

< 14 Cs-134

< 5

< 3

< 5

<4

< 3

< 5

< 3

<2

< 3

<6

< 4

< 5

< 3

< 6

< 3

< 6

<4

< 2

< 3

< 5

< 3

< 5

< 3

< 5

< 3

< 2

< 6

<4

< 2

< 3

< 2

< 5

< 2 Cs-137

< 6

< 2

<4

< 3

<2

< 5

< 3

< 1

< 3

< 5

< 3

< 5

< 3

< 5

< 3

< 2

<6

<4

< 2

< 3

< 2

< 5

< 3

<6

< 3

< 5

< 3

< 2

< 6

<4

< 1

< 3

< 2

< 5

< 2 Ba-140

< 33

< 20

< 25

< 23

< 32

< 17

< 22

< 26

< 27

< 32

< 25

< 30

< 25

< 30

< 18

< 23

< 35

< 23

< 20

< 28

< 24

< 28

< 25

< 35

< 26

< 31

< 22

< 23

< 34

< 24

< 20

< 26

< 22

< 26

< 23 La-140

< 12

<6

< 9

<7

< 10

<5

<7

< 8

< 9

< 10

<7

< 12

<8

< 8

< 6

< 7

< 10

< 9

< 5

< 8

< 9

< 7

< 11

< 9

< 8

< 7

< 9

< 7

< 8

< 7

Table C-11.1 Table C-11.2 Table C-11.3 CONCENTRATIONS OF GROSS BETA IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD 12/29/16 - 02/02/17 02/02/17 - 03/02/17 03/02/17 - 03/30/17 03/30/17 - 04/27 /17 04/27/17 - 06101/17 06/01/17 - 06/29/17 06/29/17 - 08/03/17 08/03/17 - 08/31/17 08/31/17 - 09128/17 09/28/17 - 11/02/17 11/02/17 - 11/30/17 11/30/17 - 01/04/18 MEAN +/- 2 STD DEV BD-22

< 2.2 3.2 +/- 1.7 2.9 +/- 1.4

< 2.4

< 2.1 3.3 +/- 1.5 3.2 +/- 1.4

< 2.2 5.4 +/- 1.7 2.7 +/- 1.4 3.3 +/- 1.6 2.7 +/- 1.4 3.3 +/- 1.7 CONCENTRATIONS OF TRITIUM IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD 12/29/16 - 02/02/17 02/02117 - 03/02/17 03/02/17 - 03/30/17 03/30117 - 04/27/17 04/27/17 - 06/01/17 06/01/17 - 06/29/17 06129117 - 08/03/17 08103117 - 08/31/17 08/31/17 - 09/28117 09128117 - 11 /02117 11102/17 - 11 /30117 11/30/17 - 01/04118 MEAN+/- 2 STD DEV BD-22 208 +/- 128 239 +/- 130 363 +/- 132 450 +/- 141 424 +/- 130 247 +/- 125

< 180 764 +/- 151 919 +/- 163 1540 +/- 216 1270 +/- 192 329 +/- 133 614 +/- 906 CONCENTRATIONS OF 1-131 IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-22 12/29116 - 02102117

< 0.5 02/02117 - 03102117

< 0.5 03/02/17 - 03130117

< 0.3 03/30/17 - 04/27/17

< 0.5 04/27/17 - 06/01/17

< 0.7 06101/17 - 06/29117

< 0.7 06129/17 - 08/03/17

< 0.6 08103/17 - 08/31/17

< 0.4 08131/17 - 09/28/17

< 0.7 09128/17 - 11 /02/17

< 0.9 11/02117 - 11/30117

< 0.4 11/30117 - 01/04118

< 0.8 MEAN THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-4

Table C-11.4 CONCENTRATIONS OF GAMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 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 12/29/16 - 02/02/17

< 5

< 7

< 10

< 7

< 9

< 7

< 12

<6

< 5

< 32

< 7 02/02117 - 03/02/17

< 5

< 11

< 5

< 11

< 5

< 9

<6

< 5

< 31

< 10 03/02/17 - 03/30/17

<6

< 14

< 5

< 15

< 6

< 11

<6

< 8

< 34

< 10 03/30/17 - 04/27/17

<4

< 11

<4

< 9

< 5

< 8

<4

< 5

< 30

<8 04/27/17 - 06/01/17

< 5

<6

< 9

< 5

< 10

<6

< 10

< 7

< 33

<9 06/01/17 - 06/29/17

< 5

< 11

<4

< 10

<6

< 10

< 5

< 28

< 11 06/29/17 - 08/03/17

< 1

< 3

< 1

<2

< 1

< 2

< 1

< 30

< 10 08/03/17 - 08/31/17

< 3

< 7

< 3

<6

< 3

< 6

< 3

< 22

< 8 08/31/17 - 09/28/17

< 3

<4

< 9

< 4

< 7

<4

< 7

<4

< 3

< 30

< 9 09/28/17 - 11 /02/17

< 3

< 6

< 3

<6

< 3

< 6

< 3

< 20

< 7 11/02/17 - 11/30/17

< 5

< 6

< 8

<4

< 8

< 5

< 9

< 7

<6

< 36

< 11 11/30/17 - 01/04/18

<4

< 9

< 5

< 8

< 5

< 7

< 5

<4

< 29

< 8

(')

MEAN I

CJ1

Table C-111.1 CONCENTRATIONS OF TRITIUM IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION PERIOD BD-13 BD-34 BD-35 BD-36 BD-37 BD-50 BD-51 01/12/17 - 02/20/17

< 182

< 185

< 183

< 188

< 187

< 188

< 183 04/13/17 - 04/22/17

< 193

< 194

< 192

< 195

< 194

< 192

< 192 07/13/17 - 07/13/17

< 182

< 183

< 184

< 185

< 180

< 185 10/12/17 - 10/12/17

< 187

< 186

< 190

< 185

< 188

< 187

< 189 MEAN C-6 BD-54

< 184

< 189

< 182

< 185

0 I

Table C-111.2 SITE COLLECTION PERIOD BD-13 01/19/17 - 01/19/17 04/20/17 - 04/20/17 07/13/17 - 07/13/17 10/12/17 - 10/12/17 MEAN BD-34 01/12/17 - 01/12/17 04/13/17 - 04/13/17 07/13/17 - 07/13/17 10/12/17 - 10/12/17 MEAN BD-35 01/12/17 - 01/12117 04/13/17 - 04/13/17 07/13/17 - 07/13/17 10/12/17 - 10/12/17 MEAN BD-36 02/20/17 - 02/20/17 04/22/17 - 04/22/17 07/13/17 - 07/13/17 10/12/17 - 10/12/17 BD-37 01/12/17 - 01/12/17 04/13/17 - 04/13/17 07/13/17 - 07/13/17 10/12/17 - 10/12/17 MEAN Mn-54

< 5

< 6

<4

< 7

< 8

<7

< 5

< 8

< 6

< 9

< 7

< 6

< 7

< 5

<7

< 8

< 5 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 Co-58

< 6

< 5

< 7

< 5

<6

< 6

< 9

< 5

< 10

< 6

< 7

< 5

< 8

<6

< 8

< 5 Fe-59

< 12

< 13

< 14

< 12

< 19

< 11

< 9

< 20

< 12

< 15

< 11

< 13

< 12

< 15

< 11

< 14

< 17

< 16

< 14 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Co-60

< 6

< 5

< 7

< 9

< 5

< 7

<5

< 9

< 8

< 7

< 6

< 7

< 6

< 5

< 9

< 6 Zn-65

< 12

< 13

< 11

< 13

< 12

< 14

< 15

< 9

< 19

< 9

< 15

< 14

< 12

< 11

< 16

< 10

< 16

< 18

< 22

< 11 Nb-95

<6

< 6

< 7

< 6

< 7

< 6

< 10

< 5

< 10

< 6

< 7

< 6

< 7

< 6

< 8

< 5

< 9

< 8

< 9

< 6 Zr-95

< 10

< 9

< 13

< 9

< 11

< 8

< 12

< 9

< 16

< 10

< 12

< 11

< 12

< 14

< 9

< 12

< 16

< 15

< 12 1-131

< 8

< 10

< 11

< 8

< 14

< 9

< 15

< 11

< 12

< 10

< 15

< 14

< 10

< 13

< 12

< 15

< 11 Cs-134

<6

< 7

<7

< 7

<7

< 8

< 5

< 10

<6

< 9

<7

< 5

< 11

< 5

< 8

< 9

< 7 Cs-137

< 6

<6

< 8

< 6

< 7

< 8

<7

< 5

< 9

<7

< 7

< 6

< 7

< 5

< 8

< 9

< 7 Ba-140

< 30

< 27

< 32

< 30

< 31

< 33

< 41

< 20

< 38

< 28

< 35

< 42

< 35

< 38

< 28

< 33

< 38

< 40

< 31 La-140

<6

< 10

<6

< 12

< 9

< 10

< 8

< 13

< 8

< 13

< 7

< 9

< 8

< 13

< 8

<7

< 10

< 11

<9

Table C-111.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND/WELL WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 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-50 01/12/17 - 01/12/17

< 9

< 8

< 12

< 9

< 13

< 8

< 14

< 13

< 7

< 8

< 39

< 10 04/13/17 - 04/13/17

< 7

<7

< 12

< 8

< 17

< 8

< 12

< 11

< 6

< 7

< 35

< 12 07/13/17 - 07/13/17

<4

< 5

< 12

< 5

< 11

< 6

< 11

< 9

<6

< 5

< 25

< 9 10/12/17 - 10/12/17

< 5

<6

< 11

<6

< 11

< 7

< 12

< 11

<6

< 7

< 27

< 11 MEAN BD-51 01/12/17 - 01/12/17

< 6

< 15

< 6

< 11

< 7

< 13

< 9

< 5

<6

< 29

< 7 04/13/17 - 04/13/17

< 7

< 17

< 8

< 13

< 8

< 12

<8

< 8

< 33

< 10 07/13/17 - 07/13/17

< 6

< 5

< 12

< 5

< 8

< 5

< 8

<6

< 24

< 10 10/12/17 - 10/12/17

<4

< 5

< 13

<6

< 11

< 6

< 10

< 11

< 6

< 27

< 7 MEAN 0

I co BD-54 01/12/17 - 01/12/17

< 8

< 16

< 9

< 18

< 10

< 16

< 13

< 8

< 9

< 40

< 9 04/20/17 - 04/20/17

< 6

<6

< 16

<6

< 10

<7

< 12

< 10

<6

< 7

< 35

< 7 07/13/17 - 07/13/17

< 7

< 5

< 12

< 5

< 14

< 7

< 9

< 12

< 7

< 28

< 8 10/12/17 - 10/12/17

<7

< 7

< 15

< 10

< 17

< 8

< 12

< 14

< 7

< 8

< 36

< 10 MEAN

Table C-IV.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/KG WET+/- 2 SIGMA COLLECTION SITE PERIOD 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 Golden Redhorse 05/03/17

< 222

< 68

< 69

< 133

< 55

< 98

< 69

< 98

< 135

< 77

< 73

< 347

< 108 Shorthead Redhorse 05/03/17

< 186

< 56

< 98

< 51

< 148

< 62

< 104

< 126

< 76

< 51

< 307

< 70 Golden Redhorse 10/24/17

< 49

< 39

< 37

< 87

< 39

< 86

< 31

< 63

< 75

< 46

< 39

< 179

< 71 Smallmouth Bass 10124/17

< 52

< 53

< 50

< 124

< 74

< 135

< 64

< 91

< 98

< 61

< 66

< 250

< 77 MEAN BD-28 Golden Redhorse 05/03/17

< 185

< 43

< 33

< 74

< 34

< 85

< 41

< 70

< 69

< 34

< 31

< 176

< 47 Channel Catfish 05/03117

< 146

< 54

< 70

< 127

< 68

< 128

< 72

< 121

< 109

< 76

< 334

< 65 n

Smallmouth Bass 10/24/17

< 55

< 46

< 52

< 116

< 43

< 144

< 57

< 110

< 97

< 62

< 48

< 304

< 92 I

Quill back 10/24/17

< 57

< 99

< 72

< 151

< 49

< 174

< 75

< 142

< 134

< 89

< 76

< 358

< 117 co MEAN BD-41 Common Carp 05103/17

< 154

< 40

< 37

< 70

< 35

< 70

< 43

< 68

< 54

< 43

< 34

< 205

< 57 Largemouth Bass 05/03/17

< 155

< 60

< 80

< 96

< 81

< 163

< 89

< 125

< 98

< 59

< 75

< 341

< 95 Common Carp 10124/17

< 51

< 41

< 51

< 55

< 53

< 109

< 47

< 69

< 76

< 47

< 43

< 263

< 91 Largemouth Bass 10124/17

< 66

< 72

< 80

< 126

< 84

< 167

< 70

< 95

< 148

< 74

< 87

< 379

< 112 MEAN

Table C-V.1 CONCENTRATIONS OF NICKEL-63 AND GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RES UL TS IN UNITS OF PCl/KG DRY+/- 2 SIGMA COLLECTION SITE PERIOD Ni-63 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 BD-10 05/27/17

< 192

< 92

< 78

< 206

< 91

< 167

< 82

< 147

< 95 164 +/- 72

< 421

< 96 10/18/17

< 193

< 97

< 105

< 266

< 107

< 259

< 126

< 195

< 135 131 +/- 91

< 490

< 176 MEAN 148 +/- 47 BD-25 05/27/17

< 197

< 71

< 65

< 152

< 59

< 144

< 83

< 120

< 82 96 +/- 87

< 371

< 64 10/18/17

< 185

< 86

< 111

< 208

< 111

< 239

< 98

< 175

< 119

< 123

< 504

< 128 MEAN 96 +/- 0 BD-57 05/27/17

< 196

< 56

< 52

< 121

< 49

< 150

< 61

< 107

< 69 88 +/- 60

< 286

< 93 10/18/17

< 169

< 81

< 76

< 184

< 93

< 177

< 90

< 146

< 101

< 115

< 356

< 102

(')

MEAN 88 +/- 0 I

~

0

Table C-Vl.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RES UL TS IN UNITS OF E-3 PCl/CU METER +/- 2 SIGMA GROUP Ill-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 12/29/16 - 01/05/17 17 +/- 4 15 +/- 4 16 +/- 4 19 +/- 4 17 +/- 4 15 +/- 4 16 +/- 4 16 +/- 4 01/05/17 - 01/12/17 21 +/- 5 20 +/- 5 18 +/- 5 19 +/- 5 21 +/- 5 21 +/- 5 17 +/- 5 19 +/- 5 01112/17 - 01/19/17 16 +/- 4 19 +/- 4 18 +/- 4 21 +/- 4 18 +/- 4 21 +/- 4 21 +/- 4 17 +/- 4 01/19/17 - 01/26/17 14 +/- 4 16 +/- 4 13 +/- 4 12 +/- 4 15 +/- 4 14 +/- 4 14 +/- 4 16 +/- 4 01126/17 - 02/02/17 13 +/- 4 18 +/- 4 15 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 17 +/- 4 02/02/17 - 02/09/17 17 +/- 4 16 +/- 4 12 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 17 +/- 4 15 +/- 4 02/09/17 - 02/16/17 15 +/- 4 23 +/- 5 18 +/- 4 22 +/- 5 16 +/- 4 22 +/- 5 19 +/- 4 19 +/- 4 02/16/17 - 02/23/17 23 +/- 4 21 +/- 4 25 +/- 5 25 +/- 5 23 +/- 5 24 +/- 5 22 +/- 4 21 +/- 4 02/23/17 - 03/02/17 16 +/- 4 15 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 03/02/17 - 03/09/17 16 +/- 4 17 +/- 4 12 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 11 +/- 4 15 +/- 4 03/09117 - 03/16117 17 +/- 4 16 +/- 4 17 +/- 4 17 +/- 4 19 +/- 4 17 +/- 4 14 +/- 4 19 +/- 4 03/16/17 - 03/23117 14 +/- 5 14 +/- 5 14 +/- 5 16 +/- 5 14 +/- 5 12 +/- 5 15 +/- 5 14 +/- 5 03/23/17 - 03/30117 15 +/- 4 12 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 03130117 - 04/06/17 (1)

(1)

(1) 04/06117 - 04/13/17 12 +/- 4 14 +/- 5 9 +/- 4 11 +/- 4 14 +/- 5 11 +/- 4 11 +/- 4 7 +/- 4 04/13117 - 04/20/17 16 +/- 4 15 +/- 4 15 +/- 4 17 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 04120117 - 04/27117 11 +/- 4 12 +/- 4 11 +/- 4 11 +/- 4 11 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 04/27/17 - 05/04/17 10 +/- 3 11 +/- 4 8 +/- 3 10 +/- 3 7 +/- 3 9 +/- 3 8 +/- 3 10 +/- 4 05/04117 - 05/12/17 17 +/- 4 17 +/- 4 18 +/- 4 16 +/- 4 17 +/- 4 18 +/- 4 16 +/- 3 16 +/- 4 05/12117 - 05118/17 18 +/- 5 15 +/- 4 18 +/- 5 19 +/- 5 18 +/- 4 18 +/- 5 21 +/- 4 17 +/- 4 05/18/17 - 05125117 10 +/- 4 7 +/- 3 11 +/- 4 10 +/- 3 8 +/- 3 10 +/- 4 11 +/- 4 11 +/- 4 05125117 - 06101/17 14 +/- 4 12 +/- 4 14 +/- 4 18 +/- 4 14 +/- 4 17 +/- 4 14 +/- 4 14 +/- 4 06101117 - 06/08/17 17 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 19 +/- 4 17 +/- 4 06108/17 - 06/15/17 18 +/- 4 18 +/- 4 17 +/- 4 18 +/- 4 16 +/- 4 20 +/- 5 19 +/- 4 17 +/- 4 06/15117 - 06122/17 14 +/- 4 12 +/- 4 11 +/- 4 13 +/- 4 14 +/- 4 12 +/- 4 12 +/- 4 15 +/- 4 06122/17 - 06/29117 11 +/- 4 9 +/- 4 12 +/- 4 11 +/- 4 13 +/- 4 9 +/- 4 11 +/- 4 8 +/- 4 06129/17 - 07106117 20 +/- 5 16 +/- 4 19 +/- 4 20 +/- 5 17 +/- 4 18 +/- 4 19 +/- 4 21 +/- 4 07/06117 - 07113/17 22 +/- 5 23 +/- 5 22 +/- 5 20 +/- 4 22 +/- 5 23 +/- 5 21 +/- 5 25 +/- 5 07113117 - 07120117 15 +/- 4 14 +/- 4 12 +/- 4 17 +/- 4 13 +/- 4 14 +/- 4 17 +/- 4 16 +/- 4 07120117 - 07127117 14 +/- 4 10 +/- 3 12 +/- 3 14 +/- 4 13 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 07/27/17 - 08103117 16 +/- 4 15 +/- 4 13 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 19 +/- 4 18 +/- 4 08/03117 - 08/10/17 14 +/- 4 15 +/- 4 12 +/- 4 12 +/- 4 13 +/- 4 19 +/- 5 14 +/- 4 14 +/- 4 08110117 - 08/17/17 17 +/- 4 13 +/- 4 20 +/- 4 19 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 16 +/- 4 08/17/17 - 08/24117 17 +/- 4 16 +/- 4 15 +/- 4 14 +/- 4 21 +/- 4 17 +/- 4 22 +/- 4 18 +/- 4 08124117 - 08/31/17 16 +/- 4 15 +/- 4 14 +/- 4 17 +/- 4 19 +/- 4 20 +/- 4 20 +/- 4 19 +/- 4 08/31117 - 09/07/17 13 +/- 4 17 +/- 4 14 +/- 4 17 +/- 4 12 +/- 4 14 +/- 4 18 +/- 4 14 +/- 4 09107117 - 09/14/17 17 +/- 4 17 +/- 4 17 +/- 4 17 +/- 4 16 +/- 4 18 +/- 4 18 +/- 4 17 +/- 4 09/14117 - 09121/17 24 +/- 5 21 +/- 5 20 +/- 4 20 +/- 5 21 +/- 5 25 +/- 5 22 +/- 4 24 +/- 5 09/21/17 - 09/28117 25 +/- 5 23 +/- 5 24 +/- 5 22 +/- 4 25 +/- 5 21 +/- 4 21 +/- 4 20 +/- 5 09/28117 - 10/05/17 19 +/- 4 17 +/- 4 16 +/- 4 17 +/- 4 16 +/- 4 22 +/- 4 14 +/- 4 14 +/- 4 10/05/17 - 10/12/17 17 +/- 5 15 +/- 4 17 +/- 5 14 +/- 4 16 +/- 4 16 +/- 5 17 +/- 5 16 +/- 4 10112117 - 10119/17 15 +/- 4 16 +/- 4 17 +/- 4 13 +/- 4 14 +/- 4 13 +/- 4 16 +/- 4 16 +/- 4 10119/17 - 10/26/17 19 +/- 4 13 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 18 +/- 4 18 +/- 4 10 +/- 4 10/26/17 - 11/02/17 7 +/- 3 7 +/- 3 8 +/- 3 10 +/- 4 8 +/- 3 6 +/- 3 7 +/- 3 8 +/- 4 11/02/17 - 11/09/17 27 +/- 5 23 +/- 4 19 +/- 4 24 +/- 4 23 +/- 4 20 +/- 4 23 +/- 4 22 +/- 4 11/09/17 - 11/16/17 22 +/- 5 27 +/- 5 25 +/- 5 21 +/- 5 18 +/- 4 20 +/- 5 23 +/- 5 19 +/- 5 11/16/17 - 11/22/17 19 +/- 5 20 +/- 5 22 +/- 5 22 +/- 5 24 +/- 5 22 +/- 5 20 +/- 5 19 +/- 5 11/22/17 - 11130/17 15 +/- 4 16 +/- 4 14 +/- 4 16 +/- 4 12 +/- 3 16 +/- 4 14 +/- 4 12 +/- 4 11/30117 - 12107/17 25 +/- 5 15 +/- 4 17 +/- 4 22 +/- 4 20 +/- 4 19 +/- 4 22 +/- 5 20 +/- 5 12/07/17 - 12/14/17 23 +/- 5 17 +/- 4 19 +/- 4 20 +/- 5 23 +/- 5 17 +/- 4 20 +/- 4 21 +/- 5 12/14/17 - 12/21117 21 +/- 5 21 +/- 5 17 +/- 4 23 +/- 5 18 +/- 4 20 +/- 5 19 +/- 4 17 +/- 4 12/21/17 - 12128/17 18 +/- 4 19 +/- 5 18 +/- 4 19 +/- 4 18 +/- 4 28 +/- 6 18 +/- 4 20 +/- 5 12128/17 - 01/04/18 36 :f 5 36 +/- 5 30 +/- 5 29 +/- 5 27 +/- 5 31 +/- 5 21 +/- 5 30 +/- 5 MEAN+/- 2 STD DEV 17 +/- 10 16 +/- 10 16 +/- 9 17 +/- 8 16 +/- 8 17 +/- 9 17 +/- 8 16 +/- 9 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-11

Table C-Vl.2 MONTHLY AND YEARLY VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RES UL TS IN UNITS OF E-3 PCl/CU METER +/- 2 SIGMA GROUP I - NEAR FIELD LOCATIONS GROUP II - FAR FIELD LOCATIONS GROUP Ill - CONTROL LOCATIONS COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD

+/-2SD PERIOD

+/-2SD 12/29/16 - 02/02/17 12 21 17 +/- 5 12/29/16 - 02102/17 13 21 17 +/- 6 12/29/16 - 02102/17 16 19 17 +/- 2 02/02/17 - 03/02/17 12 25 18 +/- 8 02102/17 - 03/02/17 15 24 18 +/- 7 02/02/17 - 03/02/17 13 21 17 +/- 7 03/02/17 - 03/30/17 12 17 15 +/- 3 03/02/17 - 03/30/17 11 19 15 +/- 4 03/02/17 - 03/30/17 14 19 16 +/- 4 04/06/17 - 05/04/17 8

17 12 +/- 5 04/06/17 - 05/04/17 7

17 12 +/- 6 04/06/17 - 05/04/17 7

17 12 +/- 8 05/04/17 - 06/01 /17 7

19 15 +/- 7 05/04/17 - 06/01 /17 8

21 15 +/- 8 05/04/17 - 06/01/17 11 17 15 +/- 6 06/01/17 - 06/29/17 9

18 14 +/- 6 06/01/17 - 06/29/17 9

20 14 +/- 7 06/01 /17 - 06/29/17 8

17 14 +/- 8 06/29/17 - 08/03/17 10 23 16 +/- 7 06/29/17 - 08/03/17 13 23 17 +/- 6 06/29/17 - 08/03/17 13 25 19 +/- 9 08/03/17 - 08/31/17 12 20 15 +/- 5 08/03/17 - 08/31/17 13 22 18 +/- 6 08/03/17 - 08/31/17 14 19 17 +/- 4 08/31 /17 - 09/28/17 13 25 19 +/- 7 08/31/17 - 09/28/17 12 25 19 +/- 8 08/31/17 - 09/28/17 14 24 19 +/- 9 09/28/17 - 11 /02/17 7

19 14 +/- 8 09/28/17 - 11/02/17 6

22 14 +/- 8 09/28/17 - 11/02/17 8

16 13 +/- 7 11/02/17 - 11/30/17 14 27 21 +/- 8 11/02/17 - 11/30/17 12 24 19 +/- 8 11/02117 - 11/30/17 12 22 18 +/- 8 0

11/30/17 - 01/04/18 15 36 22 +/- 12 11/30/17 - 01/04/18 17 31 22 +/- 9 11/30/17 - 01/04/18 17 30 22 +/- 10 I

~

I\\)

12/29/16 - 01/04/18 7

36 17 +/- 9 12129/16 - 01/04/18 6

31 17 +/- 9 12129/16 - 01/04/18 7

30 16 +/- 9 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, 2017 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 12/29/16 - 03/30/17

< 2

<2

< 5

<2

<4

< 2

< 3

<2

< 2

< 11

< 5 04/06/17 - 06/29/17

< 3

<4

< 5

< 3

< 9

< 3

< 6

<4

< 3

< 22

< 7 06/29/17 - 09/28/17

< 2

< 3

< 5

< 3

< 6

< 3

<4

< 3

< 2

< 25

< 8 09/28/17 - 01/04/18

< 2

< 4

< 2

< 5

< 2

< 3

< 2

< 1

< 16

< 5 MEAN BD-03 12/29/16 - 03/30/17

< 2

< 5

< 3

< 6

< 2

<4

< 3

< 2

< 14

< 7 04/06/17 - 06/29/17

< 3

< 2

< 5

< 2

< 5

< 2

<4

< 2

< 15

< 6 06/29/17 - 09/28/17

<2

< 2

< 5

< 2

<4

< 2

<4

< 2

< 23

< 10 09/28/17 - 01/04/18

<2

< 3

<4

< 3

< 6

< 3

< 5

< 2

< 19

< 7 MEAN C')

I

~

w BD-04 12/29/16 - 03/30/17

<2

< 2

< 3

< 2

< 6

< 2

<4

< 3

< 14

< 6 04/06/17 - 06/29/17

< 2

< 3

<6

<4

< 7

< 2

< 6

<4

< 3

< 20

< 3 06/29/17 - 09/28/17

< 2

< 6

< 3

< 7

< 2

<4

< 3

< 2

< 30

<6 09/28/17 - 01/04/18

<4

< 8

<4

< 9

< 5

< 7

<4

< 26

< 15 MEAN BD-05 12/29/16 - 03/30/17

<4

< 3

< 8

< 4

< 9

< 3

<6

<4

< 3

< 24

< 9 04/06/17 - 06/29/17

< 3

< 6

< 3

< 6

< 3

<6

< 3

< 18

< 5 06/29/17 - 09/28/17

<4

< 5

< 10

<4

< 9

< 5

< 8

< 5

< 3

< 50

< 21 09/28/17 - 01/04/18

< 2

< 3

< 6

< 2

< 5

< 3

< 5

< 1

<2

< 21

<7 MEAN BD-06 12/29/16 - 03/30/17

< 2

<2

<4

< 2

< 3

< 2

<4

<2

< 13

<4 04/06/17 - 06/29/17

< 3

< 2

< 6

< 2

< 5

< 3

< 5

< 3

< 2

< 16

<6 06/29/17 - 09/28/17

< 2

< 7

<2

< 5

< 2

<4

< 3

<2

< 28

< 15 09/28/17 - 01/04/18

< 3

<4

< 8

<4

< 10

<4

< 7

< 3

< 27

< 8 MEAN

Table C-Vl.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RES UL TS 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 12/29/16 - 03/30/17

< 3

<4

< 6

<4

< 8

< 3

< 5

< 3

< 20

<6 04/06/17 - 06/29/17

<4

< 3

< 8

<4

< 9

< 3

< 7

<4

< 3

< 24

<6 06/29/17 - 09/28/17

< 2

< 3

< 5

< 3

< 5

<2

<6

< 3

< 2

< 30

< 12 09/28/17 - 01/04/18

< 2

< 3

<6

<2

<4

<2

<4

< 3

< 16

<6 MEAN BD-20 12/29/16 - 03/30/17

< 3

< 2

< 6

< 3

< 5

< 3

<4

< 3

< 2

< 11

< 5 04/06/17 - 06/29/17

< 3

<4

< 3

< 5

< 3

<4

< 2

< 19

< 8 06/29/17 - 09/28/17

< 3

<4

< 9

< 4

< 8

<4

< 7

< 3

<4

< 47

< 13 09/28117 - 01/04/18

< 3

< 5

< 2

< 7

< 3

< 5

< 2

<2

< 17

< 6 MEAN 0

I

~

.i:=.

BD-21 12/29/16 - 03/30/17

< 3

< 8

< 3

< 7

< 2

<4

< 3

< 15

<7 04/06/17 - 06/29/17

<4

< 3

<6

< 3

< 7

< 3

<4

< 3

<3

< 24

< 10 06/29/17 - 09/28/17

< 2

< 3

< 7

< 3

< 5

< 3

<4

<3

< 2

< 24

< 10 09/28/17 - 01/04/18

< 2

<7

< 3

< 6

< 2

< 4

< 2

< 19

< 9 MEAN

Table C-Vll.1 COLLECTION PERIOD 12/29/16 - 01/05/17 01/05/17 - 01/12/17 01/12/17 - 01/19/17 01/19/17 - 01/26/17 01/26/17 - 02/02/17 02/02117 - 02/09/17 02/09/17 - 02/16/17 02/16/17 - 02/23/17 02/23/17 - 03/02/17 03/02/17 - 03/09/17 03/09/17 - 03/16/17 03/16/17 - 03/23/17 03/23/17 - 03/30/17 03/30/ 17 - 04/06/ 17 04/06/17 - 04/13/17 04/13/17 - 04/20/17 04/20/17 - 04/27/17 04/27/17 - 05/04/17 05/04/17 - 05/12/17 05/12/17 - 05/18/17 05/18/17 - 05/25/17 05/25/17 - 06/01/17 06/01/17 - 06/08/17 06/08/17 - 06/15/17 06/15/17 - 06/22/17 06/22/17 - 06/29/17 06/29/ 17 - 07/06/17 07/06/17 - 07/13/17 07/13/17 - 07/20/17 07/20/17 - 07/27/17 07/27/17 - 08/03/17 08/03/17 - 08/10/17 08/10/17 - 08/17/17 08/17/17 - 08/24/17 08/24/17 - 08/31/17 08/31/17 - 09/07/17 09/07/17 - 09/14/17 09/14/17 - 09/21/17 09/21/17 - 09/28/17 09/28/17 - 10/05/17 10/05/17 - 10/12117 10/12/17 - 10/19/17 10/19/17 - 10/26/17 10/26/17 - 11/02/17 11/02/17 - 11/09/17 11/09/17 - 11/16/17 11/16/17 - 11/22117 11/22/17 - 11/30/17 11/30/17 - 12/07/17 12/07/17 - 12/14/17 12/14/17 - 12/21/17 12/21/17 - 12/28/17 12/28/17 - 01/04/18 MEAN CONCENTRATIONS OF 1-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF E-3 PCl/CU METER +/- 2 SIGMA GROUP 111-GROUP I - NEAR FIELD GROUP II - FAR FIELD CONTROL BD-06 BD-19 BD-20 BD-21

< 37

< 35

< 53

< 61

< 41

< 40

< 48

< 49

< 56

< 51

< 36

< 30

< 44 (1)

< 47

< 28

< 43

< 41

< 26

< 29

< 48

< 45

< 30

< 43

< 38

< 42

< 44

< 43

< 46

< 37

< 43

< 52

< 39

< 35

< 47

< 61

< 46

< 54

< 25

< 44

< 55

< 29

< 35

< 31

< 40

< 25

< 51

< 52

< 54

< 56

< 50

< 37

< 34

< 52

< 60

< 39

< 37

< 49

< 50

< 56

< 52

< 36

< 31

< 44 (1)

< 47

< 28

< 42

< 40

< 27

< 29

< 48

< 44

< 29

< 42

< 37

< 42

< 46

< 37

< 41

< 49

< 38

< 36

< 47

< 59

< 45

< 53

< 25

< 43

< 53

< 31

< 34

< 31

< 39

< 41

< 24

< 51

< 52

< 54

< 58

< 51

< 37

< 35

< 51

< 58

< 15

< 37

< 49

< 48

< 56

< 49

< 35

< 29

< 18 (1)

< 45

< 28

< 40

< 38

< 26

< 28

< 47

< 18

< 28

< 42

< 38

< 40

< 42

< 41

< 44

< 36

< 40

< 49

< 36

< 24

< 57

< 36

< 53

< 24

< 42

< 49

< 29

< 34

< 30

< 38

< 39

< 24

< 21

< 51

< 23

< 55

< 48

< 38

< 35

< 53

< 62

< 41

< 38

< 50

< 58

< 52

< 37

< 31

< 19 (1)

< 48

< 28

< 41

< 40

< 27

< 30

< 47

< 45

< 29

< 42

< 37

< 42

< 45

< 41

< 42

< 46

< 37

< 41

< 26

< 32

< 35

< 47

< 60

< 45

< 52

< 25

< 34

< 53

< 29

< 34

< 30

< 38

< 40

< 24

< 50

< 52

< 54

< 55

< 48 BD-02 BD-04 BD-05 BD-03

< 49

< 58

< 40

< 51

< 47

< 50

< 46

< 42

< 49

< 43

< 32

< 38

< 35 (1)

< 35

< 57

< 50

< 41

< 23

< 29

< 46

< 31

< 40

< 49

< 38

< 62

< 47

< 58

< 49

< 51

< 47

< 35

< 56

< 43

< 54

< 48

< 54

< 34

< 37

< 49

< 35

< 37

< 42

< 44

< 55

< 53

< 36

< 61

< 53

< 68

< 48

< 47

< 49

< 59

< 40

< 51

< 44

< 52

< 47

< 42

< 47

< 45

< 32

< 38

< 33 (1)

< 35

< 58

< 51

< 41

< 22

< 31

< 46

< 30

< 42

< 56

< 39

< 63

< 47

< 58

< 49

< 53

< 47

< 40

< 55

< 43

< 44

< 52

< 53

< 31

< 39

< 51

< 37

< 40

< 46

< 56

< 54

< 37

< 58

< 56

< 70

< 67

< 48

< 47

< 54

< 17

< 48

< 44

< 49

< 19

< 40

< 48

< 41

< 30

< 15

< 34 (1)

< 33

< 57

< 48

< 41

< 22

< 27

< 45

< 30

< 16

< 49

< 39

< 61

< 16

< 58

< 47

< 51

< 46

< 33

< 53

< 42

< 43

< 55

< 47

< 51

< 33

< 16

< 50

< 36

< 37

< 42

< 46

< 54

< 53

< 36

< 61

< 27

< 69

< 49

< 46

< 47

< 57

< 40

< 49

< 46

< 49

< 47

< 41

< 50

< 42

< 32

< 38

< 35 (1)

< 35

< 57

< 50

< 42

< 23

< 29

< 45

< 32

< 40

< 49

< 39

< 63

< 47

< 59

< 49

< 53

< 47

< 35

< 56

< 43

< 44

< 54

< 50

< 52

< 34

< 37

< 49

< 35

< 37

< 43

< 46

< 57

< 55

< 37

< 63

< 55

< 70

< 51

< 48 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-15

Table C-Vlll.1 CONCENTRATIONS OF 1-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION INDICATOR FARM I CONTROL FARM PERIOD BD-17 BD-18 01/04/17

< 0.7

< 0.6 02/01/17

< 0.6

< 0.8 03/01/17

< 0.3

< 0.5 04/20/17

< 0.6

< 0.7 05/04/17

< 0.6

< 0.8 05/18/17

< 0.9

< 0.7 05/31/17

< 0.8

< 0.8 06/15/17

< 0.7

< 1.0 06/28/17

< 0.9

< 0.7 07/12/17

< 0.4

< 0.4 07/27/17

< 0.9

< 0.8 08/10/17

< 0.7

< 0.6 08/24/17

< 0.5

< 0.6 09/06/17

< 0.5

< 0.4 09/21/17

< 0.4

< 0.4 10/05/17

< 0.7

< 0.8 10/19/17

< 0.4

< 0.4 11/01/17

< 0.7

< 0.8 12/06/17

< 0.6

< 0.7 MEAN C-16

0 I.....

Table C-Vlll.2 SITE BD-17 BD-18 COLLECTION PERIOD 01/06/17 02/02/17 03/02/17 04/20/17 05/04/17 05/18/17 06/01/17 06/15/17 06/29/17 07/13/17 07/27/17 08/10/17 08/24/17 09/07/17 09/21/17 10/05/17 10/19/17 11/02/17 12/07/17 MEAN 01/04/17 02/01/17 03/01/17 04/20/17 05/04/17 05/18/17 05/31/17 06/15/17 06/28/17 07/12/17 07/27/17 08/10/17 08/24/17 09/06/17 09/21/17 10/05/17 10/19/17 11/01/17 12/06/17 MEAN Mn-54

< 5

< 7

< 8

< 5

< 10

<6

< 7

< 6

< 7

< 5

< 7

< 5

< 9

< 10

< 7

< 5

< 6

< 7

< 8

< 6

< 5

< 6

< 9

< 5

< 6

< 9

< 10

< 6

< 8

< 5

< 7

< 8

< 10

< 5

< 9 Co-58

< 5

< 7

< 8

< 12

< 9

< 5

< 9

< 5

<6

< 9

< 5

< 7

< 6

< 9

< 11

<7

<6

< 5

< 8

< 7

<7

< 5

<7

< 11

< 6

< 7

<4

< 9

< 8

< 10

< 6

< 9 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 Fe-59

< 14

< 16

< 17

< 21

< 16

< 10

< 25

< 13

< 18

< 13

< 22

< 11

< 15

< 11

< 20

< 23

< 17

< 12

< 13

< 15

< 11

< 15

< 12

< 17

< 16

< 10

< 12

< 25

< 23

< 26

< 15

< 16

< 14

< 20

< 19

< 22

< 14

< 20 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Co-60

< 6

< 8

< 9

< 8

< 5

< 12

< 5

< 8

< 12

< 8

< 5

< 7

< 6

< 9

< 10

< 9

<6

< 7

< 8

< 7

< 6

< 7

< 9

<4

< 7

< 12

< 10

< 13

< 7

< 5

< 8

< 9

< 6

< 9 Zn-65

< 13

< 15

< 16

< 21

< 25

< 12

< 22

< 14

< 18

< 16

< 11

< 16

< 12

< 22

< 21

< 19

< 10

< 17

< 15

< 13

< 15

< 18

< 11

< 15

< 21

< 15

< 23

< 12

< 20

< 14

< 22 Nb-95

< 6

< 8

< 7

< 10

< 8

< 5

< 9

< 6

< 8

< 9

< 7

< 5

< 8

<6

< 10

< 6

< 7

< 8

<7

< 6

< 8

< 7

< 5

< 7

< 9

< 10

< 9

< 5

< 9

< 6

< 8

< 9

< 5

< 9 Zr-95

< 10

< 13

< 11

< 18

< 12

< 10

< 15

< 10

< 13

< 16

< 13

< 9

< 13

< 10

< 17

< 15

< 9

< 10

< 13

< 11

< 14

< 10

< 14

< 8

< 12

< 17

< 18

< 17

< 10

< 12

< 9

< 14

< 15

< 16

< 9

< 16 Cs-134

< 6

< 8

< 6

< 11

< 8

<6

< 11

<6

< 8

< 9

< 6

< 9

< 5

< 10

< 13

< 9

< 6

<6

< 7

< 5

< 8

<6

< 7

< 12

< 11

< 9

< 6

< 11

< 5

< 8

< 9

< 11

<6

< 10 Cs-137

< 7

< 8

< 9

< 8

< 5

< 9

< 5

<7

< 8

< 10

< 5

< 8

< 5

< 9

< 11

< 8

< 5

< 7

< 8

< 6

< 7

< 8

< 5

< 7

< 9

<6

< 8

< 5

< 9

< 8

< 10

< 6

< 8 Ba-140

< 25

< 31

< 32

< 44

< 35

< 21

< 42

< 24

< 30

< 34

< 32

< 25

< 28

< 41

< 49

< 43

< 36

< 24

< 27

< 33

< 29

< 41

< 25

< 33

< 31

< 25

< 46

< 47

< 38

< 29

< 33

< 39

< 41

< 38

< 47

< 26

< 39 La-140

< 5

< 7

< 11

< 15

< 11

< 7

< 11

<7

< 8

< 11

<6

< 10

< 13

< 14

< 11

< 8

<6

< 11

< 10

< 7

< 8

< 10

< 5

< 8

< 13

< 14

< 13

< 9

< 12

< 15

< 13

< 12

< 9

< 10

0 I.....

co Table C-IX.1 SITE BO-CONTROL Cabbage Radish leaves Radishes Radishes BO-QUAD 1 Radish leaves Radishes BO-QUAD 2 Green onions Lettuce Lettuce Beets Green onions Red cabbage Red beets Red cabbage Beets Green cabbage Red cabbage Brussels sprouts BO-QUAD 3 Beet greens Beets Green onions Beet greens Beets Beet greens Beets BD-QUAD4 Beet greens Beets/green onions Cauliflower leaves Cauliflower root Cauliflower root Cauliflower Cauliflower leaves COLLECTION PERIOD 08117117 08117117 08117/17 09/28117 MEAN 08116117 08116117 MEAN 06/29/17 06/29/17 06129117 (R1) 07120117 07120117 07120117 08/10117 08110117 09107117 09107117 09107117 10/05/17 MEAN 07113117 07/13117 07/13117 08124/17 08124117 09121117 09121/17 MEAN 07113/17 07113117 08124/17 08/24/17 08/24/17 (R1) 09/28/17 09/28/17 MEAN R1 - Sample re-analyzed for confinnation Mn-54

< 35

< 37

< 43

< 41

< 23

< 40

< 26

< 13

< 37

< 42

< 28

< 19

< 36

< 32

< 33

< 32

< 36

< 37

< 26

< 34

< 14

< 34

< 21

< 43

< 41

< 26

< 27

< 36

< 32 CONCENTRATIONS OF GAMMA EMITTERS IN VEGETATION SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 Co-58

< 31

< 32

< 39

< 38

< 22

< 39

< 27

< 22

< 33

< 41

< 36

< 31

< 19

< 39

< 25

< 31

< 37

< 36

< 30

< 29

< 15

< 35

< 20

< 34

< 51

< 23

< 26

< 35

< 26 RESULTS IN UNITS OF PCl/KG WET+/- 2 SIGMA Fe-59

< 59

< 76

< 73

< 83

< 59

< 76

< 40

< 49

< 74

< 92

< 80

< 58

< 36

< 78

< 63

< 66

< 89

< 81

< 83

< 52

< 69

< 36

< 73

< 47

< 65

< 67

< 60

< 65

< 84

< 71 Co-60

< 37

< 36

< 42

< 43

< 34

< 41

< 20

< 17

< 28

< 57

< 39

< 33

< 17

< 36

< 29

< 35

< 37

< 40

< 36

< 29

< 36

< 19

< 37

< 24

< 36

< 53

< 24

< 32

< 39

< 40 Zn-65

< 81

< 82

< 86

< 89

< 52

< 74

< 43

< 62

< 110

< 78

< 62

< 40

< 84

< 59

< 75

< 80

< 95

< 96

< 62

< 65

< 41

< 70

< 54

< 80

< 92

< 54

< 74

< 94

< 66 Nb-95

< 32

< 40

< 45

< 43

< 30

< 35

< 21

< 22

< 31

< 42

< 38

< 35

< 20

< 39

< 32

< 38

< 45

< 52

< 35

< 29

< 31

< 16

< 33

< 21

< 40

< 48

< 20

< 28

< 42

< 35 Zr-95

< 61

< 59

< 72

< 70

< 53

< 75

< 50

< 35

< 71

< 72

< 73

< 53

< 24

< 63

< 56

< 67

< 61

< 65

< 51

< 65

< 24

< 52

< 44

< 74

< 85

< 45

< 51

< 60

< 51 Cs-134

< 41

< 43

< 45

< 44

< 30

< 38

< 25

< 21

< 34

< 48

< 35

< 20

< 37

< 34

< 33

< 48

< 36

< 41

< 32

< 39

< 18

< 41

< 26

< 37

< 52

< 22

< 34

< 41

< 30 Cs-137

< 36

< 38

< 44

< 41

< 29

< 48

< 26 35 +/-23 55+/-17

< 41

< 51

< 37

< 33

< 22

< 38

< 39

< 32

< 43 45 +/-28

< 40

< 36

< 37

< 18

< 37

< 26

< 45

< 52

< 25 124 +/- 33 98 +/- 17

< 50

< 36 111 +/- 38 Ba-140

< 141

< 168

< 174

< 172

< 113

< 151

< 121

< 85

< 157

< 165

< 146

< 149

< 84

< 148

< 134

< 161

< 176

< 166

< 155

< 123

< 143

< 65

< 159

< 109

< 184

< 177

< 117

< 109

< 181

< 142 La-140

< 49

< 45

< 52

< 51

< 33

< 50

< 28

< 19

< 46

< 50

< 45

< 44

< 24

< 53

< 40

< 56

< 43

< 46

< 49

< 20

< 54

< 27

< 43

< 70

< 30

< 35

< 68

< 15

Table C-X.1 STATION CODE BD-02-1 BD-02-2 BD-03-1 BD-03-2 BD-04-1 BD-04-2 BD-05-1 BD-05-2 BD-06-1 BD-06-2 BD-19-1 BD-19-2 BD-20-1 BD-20-2 BD-21-1 BD-21-2 BD-101-3 BD-101-4 BD-102-1 BD-102-2 BD-103-1 BD-103-2 BD-104-1 BD-104-2 BD-104-3 BD-104-4 BD-105-1 BD-105-2 BD-105-3 BD-105-4 BD-106-1 BD-106-2 BD-107-1 BD-107-2 BD-108-1 BD-108-2 BD-109-1 BD-109-2 BD-110-1 BD-110-2 BD-110-3 BD-110-4 BD-112-1 BD-112-2 BD-114-1 BD-114-2 BD-115-1 BD-115-2 BD-116-1 BD-116-2 QUARTERLY OSLO RESULTS FOR BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS MEAN

+/- 2 S.D.

21.0 +/- 1.9 20.5 +/- 1.1 20.3 +/- 3.6 21.4 +/- 0.9 20.1 +/- 2.5 19.7 +/- 1.1 20.5 +/- 1.5 21.2 +/- 1.2 19.4 +/- 2.9 19.9 +/- 1.3 20.5 +/- 1.9 21.0 +/- 2.0 20.6 +/- 1.8 20.7 +/- 0.6 20.1 +/- 1.7 19.9 +/- 1.9 20.2 +/- 1.2 20.0 +/- 1.7 19.7 +/- 1.4 21.6 +/- 1.1 19.6 +/- 1.0 19.5 +/- 2.1 18.4 +/- 2.7 19.4 +/- 1.2 26.3 +/- 5.4 24.1 +/- 1.8 19.0 +/- 3.0 19.3 +/- 1.6 25.7 +/- 2.6 36.6 +/- 11.0 20.1 +/- 4.4 19.1 +/- 1.8 19.3 +/- 0.9 18.5 +/- 1.7 19.5 +/- 2.9 21.0 +/- 1.3 22.8 +/- 3.3 22.4 +/- 1.7 19.0 +/- 2.7 19.1 +/- 1.8 24.5 +/- 5.5 27.3 +/- 6.2 18.5 +/- 1.7 20.1 +/- 1.5 19.8 +/- 1.1 21.1 +/- 1.8 19.6 +/- 1.9 20.2 +/- 3.0 22.0 +/- 1.8 20.3 +/- 2.2 JAN-MAR 22.4 20.0 19.5 21.3 18.2 18.9 20.1 21.0 18.4 19.7 19.5 20.3 21.4 20.4 20.0 18.5 20.5 20.2 20.1 22.2 19.5 18.3 17.8 19.4 29.8 24.1 18.4 19.3 26.7 29.3 (1) 19.9 19.1 18.6 18.3 20.3 21.5 22.7 18.6 18.0 21.4 24.9 18.3 19.1 19.0 19.8 18.7 21.3 21.5 18.9 APR-JUN 20.8 20.6 22.4 22.0 20.4 20.0 21.2 21.1 21.1 20.9 21.6 21.3 19.3 20.9 20.6 20.6 19.6 21.0 20.2 21.8 20.0 20.8 20.4 20.0 25.9 24.7 19.7 19.9 24.1 35.7 18.9 19.0 19.6 19.6 20.5 20.7 24.7 23.1 21.0 20.2 23.0 27.2 19.7 20.7 20.0 21.8 19.3 21.4 21.9 20.4 JUL-SEP 20.8 21.2 20.9 20.9 20.8 19.9 19.6 22.1 20.0 19.7 19.8 22.3 20.7 21.0 20.7 20.3 20.9 19.1 18.7 21.0 18.9 19.5 17.9 19.5 26.0 24.8 17.3 19.8 26.8 42.1 22.6 17.9 18.7 17.6 18.1 21.2 23.6 21.2 18.3 19.3 27.3 25.3 18.1 20.1 20.1 21.4 20.9 18.2 21.3 20.1 OCT-DEC 20.1 20.0 18.2 21.4 20.9 20.1 21.0 20.7 18.0 19.4 20.9 20.1 21.0 20.6 18.9 20.3 19.9 19.5 19.7 21.2 19.9 19.2 17.5 18.5 23.3 22.8 20.7 18.2 25.3 39.2 18.7 19.7 19.6 18.2 20.9 21.8 22.3 22.6 18.2 19.0 26.3 31.7 17.7 20.6 20.1 21.3 19.4 19.7 23.3 21.6 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-19

Table C-X.1 QUARTERLY OSLO RESULTS FOR BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN CODE

+/-2S.D.

JAN-MAR APR-JUN JUL-SEP OCT-DEC BD-201-1 24.9 +/- 1.6 24.1 25.9 25.0 24.4 BD-201-2 21.7 +/- 1.7 21.1 21.2 22.9 21.7 BD-202-1 20.8 +/- 1.4 21.4 21.1 20.7 19.8 BD-202-2 20.4 +/- 1.7 21.1 21.2 19.6 19.8 BD-203-1 21.2 +/- 1.0 21.6 21.3 20.4 21.3 BD-203-2 19.4 +/- 0.9 19.2 20.0 19.3 18.9 BD-204-1 19.4 +/- 0.8 19.7 19.8 19.1 19.0 BD-204-2 18.6 +/- 1.5 18.6 18.8 17.5 19.3 BD-205-1 20.0 +/- 1.3 19.9 20.9 19.9 19.4 BD-205-2 19.7 +/- 2.7 18.1 21.0 19.1 20.6 BD-206-1 20.0 +/- 1.8 19.3 21.3 19.4 20.0 BD-206-2 19.1 +/- 0.7 18.8 19.0 19.5 (1)

BD-207-1 19.0 +/- 2.6 17.5 20.5 19.5 18.5 BD-207-2 19.0 +/- 2.2 18.4 20.5 18.9 18.0 BD-208-1 19.8 +/- 1.8 18.5 20.5 20.3 20.0 BD-208-2 20.2 +/- 1.0 20.0 19.9 20.0 21.0 BD-209-1 23.8 +/- 2.1 25.0 23.5 24.0 22.5 BD-209-2 24.9 +/- 1.3 25.7 25.2 24.5 24.3 BD-210-1 22.8 +/- 1.5 22.8 23.5 23.0 21.7 BD-210-2 19.6 +/- 1.0 19.9 18.9 19.7 19.9 BD-211-1 24.7 +/- 2.1 24.3 24.1 26.3 24.2 BD-211-2 23.7 +/- 2.8 22.9 24.0 25.6 22.4 BD-212-3 19.6 +/- 1.3 19.1 19.3 20.5 19.3 BD-212-4 24.5 +/- 2.5 22.7 25.0 25.5 24.9 BD-213-3 18.3 +/- 0.8 18.3 17.8 18.4 18.8 BD-213-4 18.0 +/- 1.5 16.9 18.5 18.5 18.0 BD-214-1 19.8 +/- 2.8 18.2 21.5 19.4 20.1 BD-214-2 23.1 +/- 1.5 22.9 22.2 23.8 23.6 BD-215-1 20.6 +/- 2.0 20.4 21.6 19.3 21.1 BD-215-2 18.3 +/- 1.3 18.9 (1) 18.3 17.6 BD-216-1 22.1 +/- 1.9 21.0 21.7 23.2 22.6 BD-216-2 20.9 +/- 0.5 20.8 21.1 21.1 20.6 BD-111A-1 19.8 +/- 2.0 20.7 20.6 18.7 19.3 BD-111A-2 19.6 +/- 1.7 18.9 20.6 20.1 18.9 BD-113A-1 20.3 +/- 2.2 20.0 21.2 18.9 21.2 BD-113A-2 20.7 +/- 2.3 19.7 22.3 20.0 20.6 (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-20

C')

I I\\)

-lo.

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, 2017 TABLE C-X.3 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.

+/-2S.D.

JAN-MAR 19.6 +/- 2.5 20.5 +/- 4.6 19.9 +/- 2.4 20.4 +/- 2.5 26.0 +/- 6.4 APR-JUN 20.6 +/- 2.4 21.3 +/- 4.1 20.7 +/- 1.2 22.2 +/- 0.6 26.8 +/- 9.2 JUL-SEP 19.7 +/- 3.0 21.0 +/- 5.0 20.6 +/- 1.7 20.9 +/- 0.0 28.7 +/- 13.2 OCT-DEC 20.0 +/- 2.9 20.8 +/- 4.1 20.1 +/- 1.7 19.8 +/- 4.5 28.1 +/- 12.6

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF MREM/QUARTER +/- 2 STANDARD DEVIATION SAMPLES PERIOD PERIOD PERIOD MEAN LOCATION ANALYZED MINIMUM MAXIMUM

+/-2S.D.

SITE BOUNDARY 126 17.3 24.7 20.0 +/- 2.8 INTERMEDIATE DISTANCE 126 16.9 26.3 20.9 +/- 4.4 OTHER 56 18.0 22.4 20.4 +/- 1.9 CONTROL 8

18.2 22.4 20.8 +/- 2.7 ISFSI 24 21.4 42.1 27.4 +/- 10.2 SITE BOUNDARY STATIONS - BD-101-3, BD-101-4, BD-102-1, BD-102-2, BD-103-1, BD-103-2, BD-104-1, BD-104-2, BD-105-1, BD-105-2, BD-106-1, BD-106-2, BD-107-1, BD-107-2, BD-108-1, BD-108-2, BD-109-1, BD-109-2, BD-110-1, BD-110-2, BD-111A-1, BD-111A-2, BD-112-1, BD-112-2, BD-113A-1, BD-113A-2, BD-114-1, BD-114-2, BD-115-1, BD-115-2, BD-116-1, BD-116-2 INTERMEDIATE DISTANCE STATIONS - BD-201-1, BD-201-2, BD-202-1, BD-202-2, BD-203-1, BD-203-2, BD-204-1, BD-204-2, BD-205-1, BD-205-2, BD-206-1, BD-206-2, BD-207-1, BD-207-2, BD-208-1, BD-208-2, BD-209-1, BD-209-2, BD-210-1, BD-210-2, BD-211-1, BD-211-2, BD-212-3, BD-212-4, BD-213-3, BD-213-4, BD-214-1, BD-214-2, BD-215-1, BD-215-2, BD-216-1, BD-216-2 OTHER STATIONS-BD-02-1, BD-02-2, BD-04-1, BD-04-2, BD-05-1, BD-05-2, BD-06-1, BD-06-2, BD-19-1, BD-19-2, BD-20-1, BD-20-2, BD-21-1, BD-21-2 CONTROL STATIONS-BD-03-1, BD-03-2 ISFSI STATIONS-BD-104-3, BD-104-4, BD-105-3, BD-105-4, BD-110-3, BD-110-4

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

Collected in the Vicinity of Braidwood Station, 2000 - 2017 BD-1 O Kankaee River, Downstream 10.0 8.0 6.0

..J

~

Q.

4.0

..J 2.0 0.0..,__ __

--l--_____

__. ___ 1-----+-----I 01-01-00 01-01-03 01-01-06 01-01-09 01-02-12 01-02-15 01-02-18 16.0 14.0 12.0 10.0 BD-25 (C) Kankakee River, Upstream

~

8.0 Q.

6.0 4.0 2.0 0.0 +------1----1------1-----1-----1------1 01-01-00 01-01-03 01-01-06 01-01-09 01-02-12 01-02-15 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-22

FIGURE C-2 Surface Water - Gross Beta - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2007 - 2017

...J i3 c.

...J 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 01-25-07 16.0 14.0 12.0 10.0 BD-38 Main Drainage Ditch 11-21-08 09-18-10 07-15-12 05-12-14 03-08-16 01-03-18 BD-40 Braidwood Station Cooling Lake i3 8.0

c.

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

10-05-06 08-20-08 07-06-10 05-21-12 04-06-14 02-20-16 01-05-18 C-23

FIGURE C-3 Surface Water - Gross Beta - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2017

..J 5

c..

C3 c..

14.0 12.0 10.0 8.0 6.0 4.0 2.0 BD-55 North Pond Fatlan Site 0.0.f-----1-----+----+----+-----+------l 01-25-07 11-21-08 09-18-10 07-15-12 05-12-14 03-08-16 01-03-18 BD-56 South Pond Fatlan Site 10.0 8.0 6.0 4.0 2.0 0.0 +-----+----+----+----+----+-----!

01-25-07 11-21-08 09-18-10 07-15-12 05-12-14 03-08-16 01-03-18 GAPS IN DATA ARE DUE TO SAMPLING POINTS BEING FROZEN AT TIME OF COLLECTION C-24

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

Collected in the Vicinity of Braidwood Station, 2000 - 2017 BD-10 Kankakee River, Downstream 3000 2500 2000

....I

~

1500 Q,

s 0 Q, 1000 500 o+:-~~~~~-+.-=-:.......:...:...:::.:i::::::::::::..:..:_.::...:......,..::-~~+---_:____:_~

03-25-00 03-12-03 02-26-06 02-12-09 01-30-12 01-16-15 01-02-18 BD-25 (C} Kankakee River, Upstream 400 300 200 100 0""-~~--~~--4-~~__.---~~-1--~~-f-~~--1 03-25-00 03-12-03 02-26-06 02-12-09 01-30-12 01-16-15 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-25

FIGURE C-5 Surface Water - Tritium - Stations BD-38 and BD-40 Collected in the Vicinity of Braidwood Station, 2006 - 2017 BD-38 Main Drainage Ditch 2400 2100 1800 5

1500 0

1200

c.

900 600 300 0

03-09-06 07-20-08 12-01-10 04-13-13 08-25-15 01-05-18 BD-40 Braidwood Station Cooling Lake 400 300

..J

[)

200

c.

100 0+-~~--+~~~-+-~~~1--~~-+~~---i 07-20-06 11-03-08 02-18-11 06-04-13 09-19-15 01-03-18 C-26

FIGURE C-6 Surface Water - Tritium - Stations BD-55 and BD-56 Collected in the Vicinity of Braidwood Station, 2007 - 2017 BD-55 North Pond Fatlan Site 250 200 150

...J i3

c.

100 50 0

03-29-07 05-24-09 07-20-11 09-14-13 11-10-15 01-05-18 BD-56 South Pond Fatlan Site 250 200 150

...J i3

c.

100 50 0

03-29-07 05-24-09 07-20-11 09-14-13 11-10-15 01-05-18 C-27

FIGURE C-7 Public Water - Gross Beta - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2017

..J

~

c.

BD-22 Wilmington 10.0 8.0 6.0 4.0 2.0 0.0 -t-------+-----i-----t-------+----1 01-29-00 09-01-03 04-04-07 11-05-10 06-08-14 01-09-18 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-28

FIGURE C-8 Public Water - Tritium - Station BD-22 Collected in the Vicinity of Braidwood Station, 2000 - 2017

..J

~

c.

7600 7200 6800 6400 6000 5600 5200 4800 4400 4000 3600 3200 2800 2400 2000 1600 1200 800 BD-22 Wilmington 408:i&~~~~~~lilll~~~~~~~~~~~~

01-29-00 09-01-03 04-04-07 11-05-10 06-08-14 01-09-18 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-29

FIGURE C-9 Ground/Well Water - Tritium - Stations BD-13 and BD-34 Collected in the Vicinity of Braidwood Station, 2000 - 2017

! 0 Cl.

...I i3 Cl.

BD-13 Braidwood City Hall Well 500 400 300 200 100 0-1-~~-1---~-+-~~--11---~~+-~~-1-~~---1 01-07-00 01-06-03 01-05-06 01-04-09 01-04-12 01-03-15 01-02-18 BD-34 Gibson Well 700 600 500 400 300 200 100 O+-~-<r--+---'"-~-1-~~--1~~~+-~~-r-~~--i 01-07-00 01-06-03 01-05-06 01-04-09 01-04-12 01-03-15 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-30

FIGURE C-10 Ground/Well Water - Tritium - Stations BD-35 and BD-36 Collected in the Vicinity of Braidwood Station, 2000 - 2017

...I 0

Q.

BD-35 Joly Well 500 400 300 200 100 O+-->.._~-+-~-<.>---+-~~--+-~~--+~~____,f--~----1 01-07-00 01-06-03 01-05-06 01-04-09 01-04-12 01-03-15 01-02-18 BD-36 Hutton Well 1200 1000 800 i3 600 Q.

400 200 0+-~~-+-~~--~~--~~-+-~~--~~--1 01-07-00 01-06-03 01-05-06 01-04-09 01-04-12 01-03-15 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-31

FIGURE C-11 Ground/Well Water - Tritium - Station BD-37 Collected in the Vicinity of Braidwood Station, 2000 - 2017 BD-37 Nurczyk Well 600 500 400

...I i3

c.

300 200 100 o+-~~~~~--~~~+-~~-1-~~--1~~---1 01-07-00 01-06-03 01-05-06 01-04-09 01-04-12 01-03-15 01-02-18 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY.

C-32

FIGURE C-12 Ground/Well Water - Tritium - Station BD-50 and BD-51 Collected in the Vicinity of Braidwood Station, 2007 - 2017

_J

~

c.

1000 900 800 700 600 500 400 300 200 100 BD-50 Skole Well 0+-~~---~~-+-~~--+~~~1--~~-1-~~~

01-01-07 11-01-08 09-02-10 07-03-12 05-04-14 03-04-16 01-03-18 STATION BD-50 WAS INITIALLY DISCONTINUED ON 10118107 AND RESUMED ON 04108110 BD-51 Fatlan Well 600 500 400 300 200 100 0

01-03-07 10-03-09 07-03-12 04-03-15 01-01-18 NEW STATIONS BD-50 AND BD-51 ADDED IN 2007 C-33

FIGURE C-13 Ground/Well Water - Tritium - Stations BD-53 and BD-54 Collected in the Vicinity of Braidwood Station, 2007 - 2017 BD-53 Phelps Well*

600 500 400

~

300 Q.

200 100 0

01-03-07 11-24-07 10-14-08 09-04-09 07-26-10 06-16-11

BD-53 was removed from the program during the 3rd quarter of 2011 BD-54 Cash Well 600 500 400 5

0 300 Q.

200 100 0

01-03-07 03-17-09 05-30-11 08-11-13 10-24-15 01-05-18 C-34

FIGURE C-14 Air Particulate - Gross Beta-Stations BD-03 (C) and BD-06 Collected in the Vicinity of Braidwood Station, 2000 - 2017 M

.E 0 c.

9 w 0....

M

.E 0 80.0 60.0

c. 40.0 M

0 w 0....

20.0 BD-03 (C) County Line Road 0.0 -------+------t----t------1 01-07-00 08-14-03 03-21-07 10-26-10 06-02-14 01-07-18 BD-06 Godley 60.0 50.0 40.0 30.0 20.0 10.0 0.0 ----1-----i---------t-------t 01-07-00 08-14-03 03-21-07 10-26-10 06-02-14 01-07-18 C-35

FIGURE C-15 Air Particulate - Gross Beta-Stations BD-19 and BD-20 Collected in the Vicinity of Braidwood Station, 2000 - 2017 M

E

(.) c.

M 'i' w

0....

60.0 50.0

'E 4o.o

~ 30.0 M

0 w 0

20.0 10.0 BD-19 Near Field, NW 0.0 -i---------+----+------+------1 01-07-00 08-14-03 03-21-07 10-26-10 06-02-14 01-07-18 BD-20 Near Field, N 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 01-07-00 08-14-03 03-21-07 10-26-10 06-02-14 01-07-18 C-36

FIGURE C-16 Air Particulate - Gross Beta-Station BD-21 Collected in the Vicinity of Braidwood Station, 2000 - 2017 70.0 60.0 50.0 C')

.E 0

40.0 Q.

9 30.0 w

0....

20.0 10.0 BD-21 Near Field, NE 0.0 +-----t-----+---_____,r-----+---------1 01-07-00 08-14-03 03-21-07 10-26-10 06-02-14 01-07-18 C-37

FIGURE C-17 Air Particulate - Gross Beta-Stations BD-02 and BD-04 Collected in the Vicinity of Braidwood Station, 2005 - 2017 BD-02 Near Field, NW 60.0 50.0

.., 40.0 E

0 0 c. 30.0 0

ui 20.0 0....

10.0 0.0 07-07-05 08-07-07 09-06-09 10-07-11 11-06-13 12-07-15 01-06-18 BD-04 Near Field, N 60.0 50.0 40.0

§ 0 c.

30.0

'i'

~

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

07-07-05 08-07-07 09-06-09 10-07-11 11-06-13 12-07-15 01-06-18 C-38

FIGURE C-18 Air Particulate - Gross Beta-Station BD-05 Collected in the Vicinity of Braidwood Station, 2005 - 2017 60.0 50.0

.., 40.0

§ 0 c. 30.0 0 w 0

20.0 10.0 BD-05 Near Field, NE 0.0 +-----1-----1------.i.---____...----1 07-07-05 08-07-07 09-06-09 10-07-11 11-06-13 12-07-15 01-06-18 C-39

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APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

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TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teled~ne Brown En9ineerin9 Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation (bl Value March 2017 E11811 Milk Sr-89 pCi/L 87 97.7 0.89 A

Sr-90 pCi/L 12.4 16.2 0.77 w

E11812 Milk Ce-141 pCi/L 135 145 0.93 A

Co-58 pCi/L 153 150 1.02 A

Co-60 pCi/L 182 183 1.00 A

Cr-51 pCi/L 258 290 0.89 A

Cs-134 pCi/L 104 120 0.87 A

Cs-137 pCi/L 142 140 1.02 A

Fe-59 pCi/L 135 129 1.05 A

1-131 pCi/L 92.6 97.9 0.95 A

Mn-54 pCi/L 173 164 1.05 A

Zn-65 pCi/L 208 199 1.04 A

E11813 Charcoal 1-131 pCi 92 93.9 0.98 A

E11814 AP Ce-141 pCi 99.9 101 0.99 A

Co-58 pCi 95.4 104 0.92 A

Co-60 pCi 140 127 1.10 A

Cr-51 pCi 211 201 1.05 A

Cs-134 pCi 82.1 83.2 0.99 A

Cs-137 pCi 92.8 97.0 0.96 A

Fe-59 pCi 107 89.3 1.20 A

Mn-54 pCi 106 114 0.93 A

Zn-65 pCi 137 138 0.99 A

E11816 Soil Ce-141 pCi/g 0.258 0.250 1.03 A

Co-58 pCi/g 0.241 0.258 0.93 A

Co-60 pCi/g 0.312 0.315 0.99 A

Cr-51 pCi/g 0.439 0.500 0.88 A

Cs-134 pCi/g 0.176 0.207 0.85 A

Cs-137 pCi/g 0.304 0.317 0.96 A

Fe-59 pCi/g 0.210 0.222 0.95 A

Mn-54 pCi/g 0.292 0.283 1.03 A

Zn-65 pCi/g 0.353 0.344 1.03 A

E11815 Water Fe-55 pCi/L 1600 1890 0.85 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 (Page 1of4)

D-1

TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teled~ne Brown Ensineerins Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Value June 2017 E11844 Milk Sr-89 pCi/L 81.3 92.6 0.88 Sr-90 pCi/L 12.1 13.5 0.90 E11846 Milk Ce-141 pCi/L 142 151 0.94 Co-58 pCi/L 147 155 0.95 Co-60 pCi/L 185 191 0.97 Cr-51 pCi/L 321 315 1.02 Cs-134 pCi/L 168 188 0.89 Cs-137 pCi/L 148 150 0.99 Fe-59 pCi/L 116 115 1.01 1-131 pCi/L 102 93.6 1.09 Mn-54 pCi/L 168 172 0.98 Zn-65 pCi/L 195 204 0.96 E11847 Charcoal 1-131 pCi 87.9 84.8 1.04 E11845 AP Sr-89 pCi 70.8 79.1 0.90 Sr-90 pCi 9.10 11.5 0.79 E11848 AP Ce-141 pCi 112 116 0.96 Co-58 pCi 119 119 1.00 Co-60 pCi 171 146 1.17 Cr-51 pCi 270 241 1.12 Cs-134 pCi 152 144 1.05 Cs-137 pCi 114 115 0.99 Fe-59 pCi 94.1 88.3 1.07 Mn-54 pCi 139 132 1.06 Zn-65 pCi 141 156 0.90 E11849 Water Fe-55 pCi/L 1840 1890 0.97 July 2017 E11901 AP GR-A pCi 50.1 44.2 1.13 GR-B pCi 218 233 0.93 (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 D-2 Evaluation (bl A

A A

A w

A A

(Page 2 of 4)

TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teled~ne Brown En9ineerin9 Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Evaluation (bl Value September 2017 E11914 Milk Sr-89 pCi/L 84.3 82.7 1.02 A

Sr-90 pCi/L 12.6 12.1 1.04 A

E11915 Milk Ce-141 pCi/L 93.9 87.0 1.08 A

Co-58 pCi/L 115 117 0.98 A

Co-60 pCi/L 265 262 1.01 A

Cr-51 pCi/L 273 217 1.26 w

Cs-134 pCi/L 186 201 0.93 A

Cs-137 pCi/L 175 172 1.02 A

Fe-59 pCi/L 137 125 1.09 A

1-131 pCi/L 78.0 71.0 1.10 A

Mn-54 pCi/L 128 123 1.04 A

Zn-65 pCi/L 206 184 1.12 A

E11916 Charcoal 1-131 pCi 71.9 64.4 1.12 A

E11917 AP Ce-141 pCi 80.1 86.3 0.93 A

Co-58 pCi 110 116 0.95 A

Co-60 pCi 277 260 1.07 A

Cr-51 pCi 275 215 1.28 w

Cs-134 pCi 192 199 0.96 A

Cs-137 pCi 165 170 0.97 A

Fe-59 pCi 122 124 0.98 A

Mn-54 pCi 120 122 0.99 A

Zn-65 pCi 175 183 0.96 A

E11918 Water Fe-55 pCi/L 1630 1630 1.00 A

E11919 Soil Ce-141 pCi/g 0.136 0.142 0.96 A

Co-58 pCi/g 0.179 0.191 0.94 A

Co-60 pCi/g 0.405 0.429 0.94 A

Cr-51 pCi/g 0.230 0.355 0.65 N(1l Cs-134 pCi/g 0.272 0.328 0.83 A

Cs-137 pCi/g 0.336 0.356 0.94 A

Fe-59 pCi/g 0.210 0.205 1.02 A

Mn-54 pCi/g 0.210 0.201 1.05 A

Zn-65 pCi/g 0.301 0.301 1.00 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0. 70-0. 80 or 1. 20-1. 30 N =Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and> 1.30 (1) See NCR 17-16 (Page 3 of 4)

D-3

TABLE D.1 Analytics Environmental Radioactivity Cross Check Program Teled~ne Brown En9ineerin9 Environmental Services Identification TBE Known Ratio of TBE to Month/Year Number Matrix Nuclide Units Reported Value (a)

Analytics Result Value December 2017 E12054 Milk Sr-89 pCi/L 92.1 92.3 1.00 Sr-90 pCi/L 18.3 16.9 1.09 E12055 Milk Ce-141 pCi/L 97.8 98.3 0.99 Co-58 pCi/L 92.3 89.9 1.03 Co-60 pCi/L 176 173 1.02 Cr-51 pCi/L 226 242 0.93 Cs-134 pCi/L 118 125 0.95 Cs-137 pCi/L 148 141 1.05 Fe-59 pCi/L 123 113 1.08 1-131 pCi/L 66.0 57.8 1.14 Mn-54 pCi/L 173 161 1.08 Zn-65 pCi/L 233 211 1.10 E12056 Charcoal 1-131 pCi 48.1 47.5 1.01 E12057A AP Ce-141 pCi 108 111 0.97 Co-58 pCi 89.5 102 0.88 Co-60 pCi 223 196 1.14 Cr-51 pCi 311 274 1.13 Cs-134 pCi 141 142 1.00 Cs-137 pCi 162 160 1.01 Fe-59 pCi 121 129 0.94 Mn-54 pCi 177 182 0.97 Zn-65 pCi 203 239 0.85 E12058 Water Fe-55 pCi/L 1970 1740 1.13 E12059 AP Sr-89 pCi 71.2 87.4 0.81 Sr-90 pCi 12.9 16.0 0.81 (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 D-4 Evaluation (b)

A A

/I A

A A

A (Page 4 of 4)

TABLE D.2 DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teled~ne Brown En§i!ineerin§i! Environmental Services Identification TSE Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value Value (a)

Range February 2017 17-MaS36 Soil Ni-63 Sq/kg

-5.512 (1)

A Sr-90 Sq/kg 571 624 437-811 A

17-MaW36 Water Am-241 Sq/L 0.693 0.846 0.592-1.100 A

Ni-63 Sq/L 13.4 12.2 8.5 -15.9 A

Pu-238 Sq/L 0.7217 0.703 0.492 - 0.914 A

Pu-239/240 Sq/L 0.9277 0.934 0.654 -1.214 A

17-RdF36 AP U-234/233 Sq/sample 0.0911 0.104 0.073 - 0.135 A

U-238 Sq/sample 0.0967 0.107 0.075 - 0.139 A

17-RdV36 Vegetation Cs-134 Sq/sample 6.44 6.95 4.87 -9.04 A

Cs-137 Sq/sample 4.61 4.60 3.22 - 5.98 A

Co-57 Sq/sample

-0.0229 (1)

A Co-60 Sq/sample 8.52 8.75 6.13-11.38 A

Mn-54 Sq/sample 3.30 3.28 2.30-4.26 A

Sr-90 Sq/sample 1.30 1.75 1.23 - 2.28 w

Zn-65 Sq/sample 5.45 5.39 3.77 - 7.01 A

August 2017 17-MaS37 Soil Ni-63 Sq/kg 1130 1220 854 - 1586 A

Sr-90 Sq/kg 296 289 202 - 376 A

17-MaW37 Water Am-241 Sq/L 0.838 0.892 0.624 -1.160 A

Ni-63 Sq/L

-0.096 (1)

A Pu-238 Sq/L 0.572 0.603 0.422 - 0.784 A

Pu-239/240 Sq/L 0.863 0.781 0.547 - 1.015 A

17-RdF37 AP U-234/233 Sq/sample 0.103 0.084 0.059-0.109 w

U-238 Sq/sample 0.115 0.087 0.061-0.113 N (2) 17-RdV37 Vegetation Cs-134 Sq/sample 2.34 2.32 1.62 - 3.02 A

Cs-137 Sq/sample 0.05 (1)

A Co-57 Sq/sample 3.32 2.8 2.0- 3.6 A

Co-60 Sq/sample 2.09 2.07 1.45 - 2.69 A

Mn-54 Sq/sample 2.90 2.62 1.83 - 3.41 A

Sr-90 Sq/sample 1.17 1.23 0.86-1.60 A

Zn-65 Sq/sample 6.07 5.37 3.76 - 6.98 A

(a) The MA PEP 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 0.70-0.80or1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 (1) False positive test (2) See NCR 17-15 (Page 1of1)

D-5

TABLE D.3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services TBE ldentrification Known Acceptance Month/Year Number Matrix Nuclide Units Reported Value<*>

Limits Evaluation (b)

Value March 2017 MRAD-26 AP GR-A pCi/sample 76.3 85.5 28.6 - 133 April 2017 RAD-109 Water Ba-133 pCi/L 49.2 49.7 40.8 - 55.1 Cs-134 pCi/L 83.2 90.1 74.0-99.1 Cs-137 pCi/L 202 206 185 - 228 Co-60 pCi/L 51.2 54.7 49.2 - 62.7 Zn-65 pCi/L 39.3 53.8 47.2 - 65.9 GR-A pCi/L 53.6 75.0 39.5 - 92.3 GR-B pCi/L 42.7 38.5 25.5 -46.0 U-Nat pCi/L 50.1 55.6 45.2-61.7 H-3 pCi/L 7080 6850 5920- 7540 Sr-89 pCi/L 40.7 66.2 53.8-74.3 Sr-90 pCi/L 26.9 26.7 19.3-31.1 1-131 pCi/L 26.7 29.9 24.9-34.9 September 2017 MRAD-27 AP GR-A pCi/sample 40.9 50.1 16.8 - 77.8 AP GR-B pCi/sample 58.0 61.8 39.1 -90.1 October 2017 RAD-111 Water Ba-133 pCi/L 71.3 73.7 61.7 - 81.1 Cs-134 pCi/L 43.0 53.0 42.8 - 58.3 Cs-137 pCi/L 48.2 52.9 47.6-61.1 Co-60 pCi/L 69.0 69.5 62.6-78.9 Zn-65 pCi/L 335 348 313-406 GR-A pCi/L 32.5 35.6 18.3 - 45.8 GR-B pCi/L 24.3 25.6 16.0 - 33.6 U-Nat pCi/L 36.6 37.0 30.0-40.9 H-3 pCi/L 6270 6250 5390-6880 1-131 pCi/L 26.4 24.2 20.1 - 28.7 November 2017 1113170 Water Sr-89 pCi/L 57.1 50.0 39.4 - 57.5 Sr-90 pCi/L 27.1 41.8 30.8-48.0 (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 17-09 (2) See NCR 17-19 D-6 A

A A

N<1>

A A

N<1>

A A

/"'\\

A A

N <2>

(Page 1 of 1)

APPENDIX E EFFLUENT DATA Please refer to the Annual Radioactive Effluent Release Report for information regarding this program

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APPENDIX F ERRATA DATA

There is no errata data for 2017.

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

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Docket No:

50-456 50-457 BRAIDWOOD STATION UNIT 1 and UNIT 2 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2017 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Braidwood Station Braceville, IL 60407 May 2018

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Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction...................................................................................................................... 3 A. Objectives of the RGPP....................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 C. Program Description............................................................................................ 4 D. Characteristics of Tritium (H-3)............................................................................ 4 Ill. Program Description....................................................................................................... 5 A. Sample Analysis.................................................................................................. 5 B. Data Interpretation............................................................................................... 5 C. Background Analysis........................................................................................... 6 IV. Results and Discussion................................................................................................. 8 A. Missed Samples.................................................................................................. 8 B. Groundwater Results........................................................................................... 8 C. Surface Water Results....................................................................................... 10 D. Summary of Results - Inter-laboratory Comparison Program.......................... 10 E. Leaks, Spills, and Releases............................................................................... 1 O F. Trends................................................................................................................ 11 G. Investigations.................................................................................................... 11 H. Actions Taken.................................................................................................... 11

Appendix A Tables Table A.,.1 Figures Figure A-1 Figure A-2 Figure A-3 Figure A-4 Figure A-5 Appendix B Tables Table B-1.1 Table B-1.2 Table B-1.3 Table B-11.1 Table B-11.2 Appendices Location Designation Radiological Groundwater Protection Program - Sampling Locations, Braidwood Station, 2017 RGPP Protected Area Monitoring Well Sample Locations Braidwood Station, 2017 RGPP Surface Water Sample Locations Braidwood Station, 2017 RGPP VB VB-4 Area Monitoring Well Sample Locations Braidwood Station, 2017 RGPP Slowdown Line Monitoring Well Sample Locations Braidwood Station, 2017 RGPP CWBD Monitoring Well Sample Locations Braidwood Station, 2017 Data Tables Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of Braidwood Station, Z017 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Surface Water Samples Collected in the Vicinity of Braidwood Station, 2017 Concentrations of Gamma Emitters in Surfate Water Samples Collected in the Vicinity of Braidwood Station, 2017 ii

I.

Summary and Conclusions In 2017, 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 2017. During that time period, 558 analyses were performed on 308 samples from 46 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 surface water samples 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/r.. Seven groundwater samples had tritium detections at concentrations

> 20,000 pCi/L, due to the abnormal release at the CWBD House identified in June 2017. Low levels of tritium were detected in groundwater and surface water at concentrations greater than the LLD of 200 pCi/L in 175 of 308 analyses. The tritium concentrations ranged from 175 +/- 112 pCi/L to 24,900 +/- 2520 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 and surface water samples throughout the sampling year in 2017. Gross Alpha (dissolved) was not detected in any surface water samples and was detected in 2 groundwater samples. The concentrations ranged from 0.8 to 14.3 pCi/L. Gross Alpha (suspended) was not detected in surface water samples and was detected in 1 groundwater sample. The concentration was 1.0 +/- 0.6 pCi/L. Gross Beta (dissolved) was detected in 2 surface water and 28 groundwater samples. The concentrations ranged from 1.4 to 49.0 pCi/L. Gross Beta (suspended) was not detected in any surface water samples and was detected in 1 groundwater sample. The concentration was 3.1

+/- 1.2 pCi/L.

Hard-To-Detect analyses were performed on 2 groundwater samples in 2017.

The analyses included 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). Naturally-occurring U-234 was detected in one sample at a concentration of 2.8 +/- 0.9 pCi/L. All other hard-to-detect nuclides were not detected at concentrations greater than their respective minimum detectable concentrations (MDCs).

II.

Introduction Braidwood Station, a two-unit PWR station is located in Will County, Illinois, 20 miles south-southwest of Joliet, Illinois. Each reactor is designed to have a capacity of 3,645 thermal megawatts. Units No. 1 went critical on May 29, 1987 and Unit No. 2 went critical on March 8, 1988. The station has been designed to keep releases to the environment at levels below those specified in the regulations.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Environmental Inc. Midwest Labs (EIML) on samples collected in 2017.

A.

Objective of the Radiological Groundwater Protection Program (RGPP)

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

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

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

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

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

5. Regularly assess analytical results to identify adverse trends;

6. Take necessary corrective actions to protect groundwater resources.

B.

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

1.

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

2.

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

3.

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

4.

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

5.

Braidwood Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends C.

Program Description 1.

Sample Collection Sample locations can be found in Table A-1 and Figures A-1 through A-5, Appendix A.

2.

Groundwater and Surface Water Samples of groundwater and surface water are collected, managed, transported and analyzed in accordance with EPA methods. Sample locations, sample collection frequencies and analytical frequencies are managed in accordance with approved station procedures.

Contractor and/or station personnel are trained in the collection, preservation management and shipment of samples as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs as well as nuclear industry audits. Station personnel review and evaluate all analytical data as it is received. Additionally, analytical data results are reviewed by an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

D.

Characteristics of Tritium (H-3)

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

Tritium is produced naturally in the upper atmosphere when cosmic rays interact with air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity and in special production reactors. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface and therefore tritiated water will travel at the same velocity as non tritiated groundwater.

Ill.

Program Description A.

Sample Analysis This section describes the general analytical methodologies used by Teledyne Brown Engineering (TBE) and Environmental Incorporated Midwest Laboratory (EIML) to analyze the environmental samples for radioactivity for the Braidwood Station RGPP in 2017.

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 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. Several factors were important in the interpretation of the data:

1.

Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.

2.

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

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

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

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

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

C.

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

1.

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

a.

Tritium Production

b.

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.

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 2017. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that was elevated in tritium.

c.

Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than 100 pCi/L.

The USEPA RadNet surface water data typically has a reported 'Combined Standard Uncertainty' of 35 to 50 pCi/L.

According to USE PA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement.

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately+/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon-specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -

240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

IV.

Results and Discussion A.

Missed Samples There was one missed sample from VB-2-5D for Quarter 4 in 2017 due to miscommunication between the program owner and the vendor sample collector.

B.

Groundwater Results Groundwater 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 24,900 pCi/L. (Table B-1.1, Appendix B).

Strontium Sr-89 and Sr-90 were analyzed for in 33 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 and surface water samples throughout the sampling year in 2017. Gross Alpha (dissolved) was detected in 2 groundwater samples. The concentrations ranged from 0.8 to 14.3 pCi/L. Gross Alpha (suspended) was detected in 1 groundwater sample. The concentration was 1.0 +/- 0.6 pCi/L. Gross Beta (dissolved) was detected in 28 groundwater samples. The concentrations ranged from 1.4 to 49.0 pCi/L. Gross Beta (suspended) was detected in 1 groundwater sample. The concentration was 3.1 +/- 1.2 pCi/L. (Table B-1.1, Appendix B).

Hard-To-Detect Hard-To-Detect analyses were performed on 2 groundwater samples in 2017. The analyses included Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235 and U-238. The naturally-.occurring isotope U-234 was detected in the sample at a concentration of 2.8 +/-

0.9 pCi/L. All other hard-to-detect nuclides were not detected at concentrations greater than their respective MDCs. (Table B-1.3, Appendix B).

Gamma Emitters Naturally-occurring K-40 was detected in one sample at a concentration of 61 +/- 32 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 Surface Water 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. All results were less than the minimum detection limit (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 and Beta (dissolved and suspended)

Two surface water samples for analyzed for Gross Alpha (dissolved and suspended) and Gross Beta (dissolved and suspended). Gross Alpha (dissolved) and Gross Alpha (suspended) were not detected in any surface water samples. Gross Beta (dissolved) was detected in 2 surface water samples at a concentrations of 5.8 and 2.7 pCi/L.

Gross Beta (suspended) was not detected in any surface water samples. (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 was one abnormal liquid release that occurred in 2017. It is described below:

On June 11th, 2017 it was identified that water being removed as part of maintenance activities in the Circulating Water Slowdown (CWBD) House was discharged to the ground approximately 50 feet from the discharge canal. Once discovered, the discharge was terminated and the area was inspected. The investigation determined that approximately 35,000 gallons of water was released between May 28, 2017 and June 11, 2017, with variable concentrations with a maximum tritium concentration of 200,209 pCi/L. The water released did not migrate off station property.

F.

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

G.

Investigations An investigation was performed in response to the CWBD House water discharge to the ground event in June 2017. Monitoring and remediation efforts were implemented immediately following the event.

H.

Actions Taken

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

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

3. 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 soil remediation efforts to remove the tritium contamination from the area.

4. Well Reduction Efforts Sampling was ceased at monitoring well VB 2-5DR after the 1st Quarter 2017, when sample results indicated the Illinois EPA's requirements to discontinue monitoring had been met. Monitoring was discontinued and the well abandoned according to appropriate abandonment requirements, and per the letter from the IEPA to Braidwood Station Re: Exelon Braidwood Station NPDES Permit Number IL0048321 VB 2/3 and the Pond Area Completion Report, dated March 28, 2013.

Additionally, sampling was discontinued at monitoring wells PS-7, PS-9, PS-13, PS-14, and PS-16 during the 4th Quarter 2017 when tritium concentrations fell below the lower level of detection. Monitoring well PS-17 proved to be dry after it was initially drilled and no samples were ever obtained. This well was abandoned due to the well's level above the groundwater table.

APPENDIX A LOCATION DESIGNATION

TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations, Braidwood Station, 2017 Station Code Sample Description DITCH F {DS-2)

Surface Water MW-102R Monitoring Well MW-11 Monitoring Well MW-141D 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-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 A-1

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APPENDIX B DATA TABLES

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TABLE B-1.1 SITE MW-2 MW-2 MW-2 MW-2 MW-4 MW-4 MW-4 MW-4 MW-5 MW-5 MW-5 MW-5 MW-6 MW-6 MW-6 MW-6 MW-7 MW-7 MW-7 MW-7 MW-11 MW-11 MW-11 MW-11 MW-102R MW-102R MW-102R MW-102R MW-1410 MW-1410 MW-1410 MW-1410 MW-142D MW-142D MW-142D MW-1420 MW-143D MW-143D MW-143D MW-143D MW-143D MW-144D MW-144D MW-144D MW-144D MW-145D MW-145D MW-145D MW-145D MW-154 MW-154 MW-154 MW-154 MW-155 MW-155 MW-155 MW-155 MW-159D MW-159D MW-159D COLLECTION DATE 03/23/17 04/22/17 09/08/17 10/30/17 01/25/17 05/15/17 08/25/17 10/30/17 03/17/17 04/22/17 09/27/17 11/16/17 01/25/17 04/22/17 09/08/17 10/30/17 01/25/17 05/15/17 08/25/17 10/31/17 03/09/17 04/20/17 08/25/17 11/21/17 01/24/17 04/23/17 09/27/17 11/14/17 03/23/17 04/22/17 09/06/17 10/30/17 03/17/17 05/15/17 09/26/17 10/31/17 03/09/17 04/20/17 09/06/17 09/26/17 12/19/17 03/17/17 04/22/17 09/27/17 10/31/17 03/14/17 05/25/17 08/29/17 11/28/17 01/24/17 05/13/17 09/28/17 10/07/17 01/24/17 05/13/17 09/28/17 10/07/17 03/09/17 04/20/17 08/25/17 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA H-3 290 +/- 129 477 +/- 145 347 +/- 124

< 187 485 +/- 144 1050 +/- 180 729 +/- 146 515 +/- 138 478 +/- 134 587 +/- 148 356 +/- 124 205 +/- 122 862 +/- 161 861 +/- 161 1270 +/- 195 1320 +/- 201 408 +/- 142 539 +/- 144 368 +/- 123 386 +/- 133

< 184 248 +/- 131

< 178

< 180

< 196

< 191

< 170

< 181 391 +/- 138 361 +/- 137 544 +/- 134 430 +/- 133 1190 +/- 187 1190 +/- 186 1430 +/- 201 1440 +/- 209

< 194

< 193 297 +/- 118

< 171

< 183 549 +/- 147 578 +/- 148 665 +/- 138 546 +/- 139

< 186

< 184

< 188

< 187

< 200

< 191

< 173

< 171

< 197

< 188

< 168

< 172 262 +/- 131

< 196 208 +/- 117 Sr-89 Sr-90 Gr-A (Dis)

Gr-A (Sus)

Gr-B (Dis)

Gr-B (Sus)

< 4.8

< 0.8

< 1.1

< 0.4 4.3 +/- 0.9

< 1.4

< 6.7

< 0.6

< 1.3

< 0.6 2.4 +/- 1.0

< 1.4

< 9.6

< 0.8

< 0.4 1.5 +/- 0.7

< 1.4

< 5.3

< 0.7

< 4.3

< 0.4 3.5 +/- 1.6

< 1.4

< 6.8

< 0. 7

< 1.1

< 0.6 4.0 +/- 1.1

< 1.4

< 4.4

< 0.6

< 1.3

< 0.4 2.9 +/- 1.1

< 1.4

< 3.7

< 0.6

< 0.7

< 0.9

< 1.6

< 4.3

< 0.8

< 6.9

< 2.1 17.0 +/- 5.5

< 4.0

< 9.2

< 0.8

< 3.9

< 0.8 21.9 +/- 2.3

< 1.7

< 5.3

< 0.8

< 2.3

< 0.3 12.4 +/- 1.7

< 1.6

< 5.1

< 0.8

< 1.0

< 0.3 4.9 +/- 0.9

< 1.6

< 7.7

< 0.7

< 0.9

< 0.5

< 1.0

< 1.5

< 6.2

< 0.6

< 0.4

< 0.6 1.4 +/- 0.6

< 1.4

< 5.5

< 0.7

< 0.4

< 0.6

< 0.8

< 1.4

< 5.3

< 0.8

< 3.8 1.0 +/- 0.6 8.7 +/- 1.7

< 1.6 BOLD Values = Unable to meet detection limits due to high solids content B-1

TABLE B-1.1 SITE COLLECTION DATE MW-159D 11/16/17 MW-162D 03/23/17 MW-162D 05/07/17 MW-1620 09/27/17 MW-162D 11/21/17 MW-BW-201S 03/17/17 MW-BW-201S 05/07/17 MW-BW-201S 09/27/17 MW-BW-201S 11/20/17 MW-BW-202S 01/25/17 MW-BW-202S 04/20/17 MW-BW-202S 09/06/17 MW-BW-202S 11/20/17 MW-BW-2038 03/07/17 MW-BW-203S 05/07/17 MW-BW-203S 09/27/17 MW-BW-203S 11/20/17 MW-BW-2071 03/09/17 MW-BW-2071 05/17/17 MW-BW-2071 09/08/17 MW-BW-2071 10/31/17 OWM31P 03/09/17 OWM31P 05/10/17 OWM31P 09/27/17 OWM31P 10/08/17 PS-7 06/13/17 PS-7 06/20/17 PS-7 06/27/17 PS-7 07/06/17 PS-7 07/11/17 PS-7 07111/17 PS-7 07/23/17 PS-7 07/25/17 PS-7 07/31/17 PS-7 08/13/17 PS-7 08/16/17 PS-7 08/24/17 PS-7 08/30/17 PS-7 10/26/17 PS-7 11/17/17 PS-7 12/19/17 PS-8 06/13/17 PS-8 06/20/17 PS-8 06/27/17 PS-8 07/06/17 PS-8 07/11/17 PS-8 07/23/17 PS-8 07/25/17 PS-8 07/31/17 PS-8 08/16/17 PS-8 08/26/17 PS-8 10/26/17 PS-8 10/26/17 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Original Recount Original Recount H-3 194 +/- 122 569 +/- 148 592 +/- 142 220 +/- 116 627 +/- 142 238 +/- 130 361 +/- 134 487 +/- 128 186 252 +/- 132 205 +/- 130 258

+/- 120 276 +/- 125 192 295 +/- 131 210

+/- 115

< 187 979 +/- 168 1110 +/- 180 1040 +/- 172 965 +/- 167

< 188

< 187

< 171

< 169

< 185

< 175

< 170 1350 +/- 196 1430 +/- 202 519 +/- 144 287 +/- 126

< 187

< 180

< 192

< 190

< 188

< 178

< 175

< 181 784 +/- 152 749 +/- 151 240 +/- 117 216 +/- 114

< 180 650 +/- 152 1040 +/- 176 456 +/- 136

< 189

< 190 Sr-89 Sr-90 Gr-A (Dis)

Gr-A (Sus)

Gr-B (Dis)

Gr-B (Sus)

< 8.4

< 0.6 0.8 +/- 0.5

< 0.4 2.3 +/- 0.8

< 1.3

< 9.0

< 0.7

< 0.6

< 0.3 5.8 +/- 1.1

< 1.2

< 5.0

< 0.9

< 3.3

< 0.3 16.2 +/- 1.9

< 1.6

< 7.1

< 0. 7

< 1.1

< 0.3 6.7 +/- 1.3

< 1.2

< 4.7

< 0.6

< 1.0

< 0.6 3.1 +/- 1.0

< 1.4

< 5.7

< 0.5 14.3 +/- 2.6

< 0.4 49.0 +/- 2.6

< 1.6 PS-8 10/26/17 Reanalysis 1960 +/- 257 2030 +/- 268 1860 +/- 249 PS-8 11/28/17 PS-8 12119/17 PS-9 06/13/17 PS-9 06/20/17 PS-9 06/27/17 PS-9 07/06/17 436 +/- 127 234 +/- 123 787 +/- 151 1640 +/- 224 241 +/- 118

< 167 BOLD Values = Unable to meet detection limits due to high solids content 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, 2017 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)

PS-9 07/11/17

< 176 PS-9 07/23/17 228 +/- 130 PS-9 07/25/17

< 189 PS-9 08/01/17

< 186 PS-9 08/10/17

< 183 PS-9 08/16/17

< 192 PS-9 08/24/17

< 190 PS-9 08/30/17

< 188 PS-10 06/13/17 1420 +/- 208 PS-10 06/18/17 12900 +/- 1330

< 8.3

< 0.8

< 1.1

< 1.9 3.1 +/- 0.9 3.1 +/- 1.2 PS-10 06/27/17 24900 +/- 2520 PS-10 07/06/17 22900 +/- 2340 PS-10 07/10/17 22400 +/- 2280 PS-10 07/24/17 14900 +/- 1530 PS-10 07/31/17 16400 +/- 1690 PS-10 08/08/17 14100 +/- 1460 PS-10 08/10/17 15500 +/- 1600 PS-10 08/14/17 14400 +/- 1490 PS-10 08/24/17 11100 +/- 1170 PS-10 08/30/17 9550 +/- 1010 PS-10 09/05/17 8810 +/- 937 PS-10 10/26/17 4670 +/- 524 PS-10 11/30/17 3770 +/- 430 PS-10 12/21/17 4630 +/- 515 PS-11 06/13/17

< 187 PS-11 06/20/17

< 177 PS-11 06/27/17 7730 +/- 821 PS-11 07/06/17 20800 +/- 2120 PS-11 07/11/17 23100 +/- 2340 PS-11 07/23/17 17900 +/- 1840 PS-11 07/25/17 18200 +/- 1870 PS-11 08/01/17 8060 +/- 863 PS-11 08/13/17 7520 +/- 801 PS-11 08/16/17 5570 +/- 616 PS-11 08/24/17 5810 +/- 639 PS-11 08/30/17 5200 +/- 580 PS-11 09/07/17 4110 +/- 460 PS-11 09/14/17 1770 +/- 240 PS-11 10/26/17 Original 1710 +/- 236 PS-11 10/26/17 Reanalysis 1750 +/- 231 PS-11 11/30/17 436 +/- 132 PS-11 12/19/17 606 +/- 141 PS-12 06/13/17 20800 +/- 2130 PS-12 06/14/17 23300 +/- 2380 PS-12 06/17/17 13000 +/- 1340

< 8.5

< 0.8

< 1.0

< 0.4 5.9 +/- 1.2

< 1.5 PS-12 06/20/17 3560 +/- 410 PS-12 06/27/17 1910 +/- 248 PS-12 07/06/17 1410 +/- 197 PS-12 07/10/17 1020 +/- 165 PS-12 07/17/17 4580 +/- 520 PS-12 07/21/17 2760 +/- 336 PS-12 07/24/17

< 193 PS-12 07/31/17 2250 +/- 289 PS-12 08/08/17 1810 +/- 246 PS-12 08/10/17 2870 +/- 344 PS-12 08/14/17 3850 +/- 439 PS-12 08/24/17 1130 +/- 188 PS-12 08/30/17 4400 +/- 499 PS-12 09/05/17 7680 +/- 827 PS-12 09/12/17 8580 +/- 904 BOLD Values = Unable to meet detection limits due to high solids content B-3

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2017 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)

PS-12 10/26/17 1420 +/- 207 PS-12 11/28/17 4270 +/- 479 PS-12 12/19/17 3250 +/- 380 PS-13 06/13/17

< 186 PS-13 06/20/17

< 189 PS-13 06/26/17

< 170 PS-13 07/08/17

< 177 PS-13 07/11/17

< 175 PS-13 07/25/17

< 187 PS-13 08/01/17

< 192 PS-13 08/16/17

< 191 PS-13 09/05/17

< 188 PS-14 06/13/17

< 187 PS-14 06/20/17

< 187 PS-14 06/26/17

< 180 PS-14 07/06/17

< 167 PS-14 07/11/17

< 186 PS-14 07/25/17

< 187 PS-14 08/01/17

< 184 PS-14 08/16/17

< 190 PS-14 08/30/17

< 186 PS-15 06/14/17

< 199 PS-15 06/20/17

< 188 PS-15 06/26/17 175 +/- 112 PS-15 07/06/17 2970 +/- 346 PS-15 07/11/17 5550 +/- 614 PS-15 07/18/17 8120 +/- 869 PS-15 07/25/17 2220 +/- 285 PS-15 08/01/17 4460 +/- 506 PS-15 08/13/17 4080 +/- 462 PS-15 08/16/17 3300 +/- 392 PS-15 08/26/17 3700 +/- 433 PS-15 09/05/17 3460 +/- 409 PS-15 10/26/17 381 +/- 127 PS-15 11/28/17 2220 +/- 281 PS-15 12/21/17 806 +/- 151 PS-16 06/14/17

< 199 PS-16 06/20/17

< 185 PS-16 06/26/17

< 170 PS-16 07/06/17

< 166 PS-16 07/11/17

< 190 PS-16 07/18/17

< 189 PS-16 07/25/17

< 184 PS-16 08/01/17

< 191 PS-16 08/16/17

< 187 PS-16 09/05/17

< 186 RW-6 03/07/17 375 +/- 137 RW-6 04/23/17 239 +/- 131

< 4.6

< 0.6

< 4.1

< 0.4 7.3 +/- 1.7

< 1.4 RW-6 09/27/17 416 +/- 127 RW-6 11/14/17 277 +/- 126 RW-11 06/20/17 4800 +/- 541 RW-11 06/26/17 2970 +/- 345 RW-11 07/07/17 3710 +/- 421 RW-11 07/10/17 5880 +/- 646 RW-11 07/19/17 6050 +/- 656 RW-11 07/24/17 2330 +/- 295 RW-11 07/31/17 2680 +/- 331 RW-11 08/08/17 2430 +/- 304 RW-11 08/14/17 2780 +/- 337 RW-11 08/24/17 4530 +/- 512 BOLD Values = Unable to meet detection limits due to high solids content B-4

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITIY OF BRAIDWOOD STATION, 2017 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-11 08/30/17 4530 +/- 514 RW-11 09/05/17 5160 +/- 576 RW-11 09/12/17 6270 +/- 674 RW-11 10/26/17 3340 +/- 390 RW-11 11/17/17 1020 +/- 168 RW-11 12/19/17 916 +/- 161 RW-12 06/20/17 188 +/- 119 RW-12 06/26/17 5350 +/- 588 RW-12 07/07/17 7270 +/- 774 RW-12 07/10/17 6770 +/- 733 RW-12 07/19/17 6690 +/- 723 RW-12 07/24/17 5400 +/- 599 RW-12 07/31/17 5560 +/- 614 RW-12 08/08/17 4410 +/- 498 RW-12 08/14/17 4160 +/- 471 RW-12 08/24/17 4190 +/- 480 RW-12 08/30/17 3730 +/- 432 RW-12 09/05/17 4560 +/- 516 RW-12 09/12/17 4410 +/- 490 RW-12 10/26/17 3000 +/- 358 RW-12 11/17/17 1730 +/- 233 RW-12 12/19/17 962 +/- 162 VB1-1 01/24/17

< 198 VB1-1 05/13/17

< 196 VB1-1 09/29/17

< 171

< 3.8

< 0.9

< 2.0

< 0.9 13.0 +/- 1.6

< 1.6 VB1-1 10/07/17

< 169 VB2-5DR 01/31/17

< 189 VB2-5DR 03/21/17

< 195 VB3-2 01/24/17

< 195 VB3-2 04/23/17

< 196 VB3-2 09/28/17

< 169

< 5.2

< 0.8

< 1.3

< 0.9 7.3 +/- 1.2

< 1.6 VB3-2 11/14/17

< 185 VB5-2 03/14/17

< 189 VB5-2 05/25/17

< 185

< 7.0

< 0.8

< 1.1

< 2.3 VB5-2 08/29/17

< 186 VB5-2 11/28/17

< 187

.?

VB6-1 03/14/17

< 187 VB6-1 05/25/17

< 185

< 5.8

< 0.8

< 1.0

< 0.7 1.5 +/- 0.8

< 1.4 VB6-1 08/29/17

< 188 VB6-1 11/28/17

< 189 VB7-1 03/14/17

< 189 VB7-1 05/25/17

< 188

< 5.8

< 0.8

< 1.1

< 0.7 7.9 +/- 1.2

< 1.4 VB7-1 08/29/17

< 187 VB7-1 11/28/17

< 186 VB8-2R 03/14/17

< 185 VB8-2R 05/25/17

< 185

< 7.5

< 0.9

< 1.5

< 0.7 20.6 +/- 1.6

< 1.4 VB8-2R 08/29/17

< 190 VB8-2R 11/28/17

< 189 VB9-1 03/14/17

< 187 VB9-1 05/25/17

< 185

< 5.7

< 0.9

< 1.9

< 0.7

< 2.0

< 1.4 VB9-1 08/29/17

< 187 VB9-1 11/28/17

< 189 VB10-1R 03/14/17

< 193 VB10-1R 05/25/17

< 189

< 7.0

< 0.9

< 1.9

< 0.7 5.4 +/- 1.4

< 1.4 VB10-1R 08/29/17

< 189 VB10-1R 11/28/17

< 186 VB11-1 03/14/17

< 191 VB11-1 05/25/17

< 184

< 7.4

< 0.8

< 1.3

< 0.8 2.2 +/- 1.1

< 1.5 VB11-1 08/29/17

< 189 VB11-1 11/28/17

< 187 BOLD Values = Unable to meet detection limits due to high solids content B-5

CD I en TABLE B-1.2 SITE MW-2 MW-4 MW-5 MW-6 MW-7 MW-11 MW-102R MW-1410 MW-1420 MW-1430 MW-1440 MW-1450 MW-154 MW-154 MW-155 MW-155 MW-1590 MW-1590 MW-1620 MW-BW-201S MW-BW-202S MW-BW-203S MW-BW-2071 OWM31P PS-10 PS-12 RW-6 VB1-1 VB3-2 VB5-2 VB6-1 VB7-1 VB8-2R VB9-1 VB10-1R VB11-1 COLLECTION DATE 04/22117 05/15/17 04/22/17 04/22/17 05/15/17 04/20/17 09/27/17 04/22/17 05/15/17 04/20/17 04/22/17 05/25/17 01/24/17 05/13/17 01/24/17 05/13/17 03/09/17 04/20/17 05/07/17 05/07/17 04/20/17 05/07/17 05/17/17 05/10/17 06/18/17 06/17/17 04/23/17 09/29/17 09/28/17 05/25/17 05/25/17 05/25/17 05/25/17 05/25/17 05/25/17 05/25/17 Be-7

< 28

< 59

< 33

< 69

< 23

< 10

< 35

< 43

< 29

< 25

< 45

< 24

< 52

< 20

< 53

< 8

< 28

< 56

< 47

< 27

< 51

< 49

< 63

< 15

< 33

< 12

< 11

< 62

< 58

< 66

< 65

< 55

< 81

< 62 K-40

< 32

< 148

< 30

< 170

< 22

< 7

< 27

< 80

< 26

< 22

< 113

< 22

< 59

< 31

< 93

< 5 61 +/- 32

< 98

< 111

< 64

< 60

< 53

< 71

< 9

< 44

< 32

< 11

< 8

< 131

< 79

< 104

< 141

< 102

< 165

< 94 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137

< 3

< 8

< 3

< 7

<2

< 1

< 3

< 5

< 3

< 5

<2

< 5

<2

<7

< 1

< 3

< 5

<4

< 2

< 6

<6

< 7

< 1

< 3

< 1

< 8

< 5

< 7

< 8

< 6

< 9

< 7

< 3

< 8

<4

< 4

< 8

< 2

< 1

<4

< 5

< 3

< 4

< 2

< 5

< 2

< 6

< 1

< 3

< 7

< 5

< 3

< 6

<6

< 8

< 1

< 2

< 4

< 1

< 7

< 6

< 7

< 5

< 7

< 6

< 7

< 20

< 8

< 9

< 15

< 5

< 3

< 7

< 8

< 6

< 11

< 6

< 10

< 5

< 16

<2

< 7

< 12

< 9

< 6

< 11

< 17

<4

< 8

< 3

< 18

< 13

< 20

< 17

< 11

< 19

< 12

< 3

< 8

< 3

< 8

<2

< 1

< 3

<4

< 3

< 6

< 2

<6

< 2

< 8

< 1

< 3

< 7

<6

<2

< 6

< 5

< 6

< 1

< 3

< 1

< 6

< 9

< 8

<6

< 10

<6

< 6

< 16

< 7

< 13

< 5

< 2

< 6

< 11

< 6

< 12

<4

< 11

<4

< 14

< 1

< 5

< 11

< 5

< 13

< 16

< 14

< 3

< 7

< 2

< 16

< 12

< 17

< 16

< 15

< 19

< 15

<4

< 8

<4

< 7

< 3

< 1

<4

< 5

< 3

< 5

< 3

< 6

< 2

< 6

< 1

< 3

< 6

< 5

< 3

< 7

< 6

< 7

< 2

< 1

<4

< 2

< 1

< 7

< 6

< 8

< 7

< 10

< 7

< 6

< 15

< 7

< 6

< 14

<4

< 2

< 6

< 9

< 6

< 5

< 10

<5

< 9

<4

< 12

< 2

< 5

< 9

< 10

< 5

< 11

< 13

< 3

< 6

< 2

< 15

< 12

< 15

< 11

< 10

< 15

< 12

< 13

< 15

< 14

< 12

< 14

< 10

< 13

< 11

< 12

< 15

< 13

< 14

< 20

< 14

< 13

< 14

< 10

< 14

< 15

< 13

< 15

< 14

< 13

< 14

< 13

< 14

< 15

< 3

< 9

<4

< 7

< 3

< 1

< 4

< 5

< 3

< 6

< 2

< 7

<2

<6

< 1

< 3

< 7

< 5

< 3

< 7

< 1

<4

< 1

< 8

< 11

< 8

<7

< 10

< 7

<3

<8

< 3

<6

< 2

< 1

<4

< 5

<3

< 3

< 6

< 2

< 6

< 2

<6

< 1

< 3

<6

< 5

<3

< 5

< 6

< 8

< 1

< 3

< 1

< 7

< 8

< 9

< 7

<6

< 9

< 7 Ba-140

< 24

< 35

< 26

< 28

< 36

< 20

< 16

< 28

< 27

< 25

< 22

< 27

< 24

< 34

< 22

< 35

< 19

< 24

< 35

< 29

< 25

< 33

< 26

< 31

< 21

< 20

< 27

< 20

< 18

< 38

< 39

< 38

< 32

< 40

< 35 La-140

< 8

< 14

< 7

< 11

< 14

< 7

< 5

< 9

<6

< 8

< 7

< 10

< 8

< 6

< 11

< 6

< 8

< 14

< 9

< 8

< 13

< 9

< 15

< 7

< 8

< 7

< 5

< 13

< 9

< 15

< 9

< 15

< 10

CD I......

TABLE B-1.3 SITE COLLECTION DATE MW-1620 05/07/17 OWM31P 05/10/17 CONCENTRATIONS OF HARD TO DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM, BRAIDWOOD STATION, 2017 Am-241

< 0.02

< 0.03 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA Cm-242 Cm-243/244 Pu-238

< 0.02

< 0.03

< 0.07

< 0.03

< 0.09

< 0.18 Pu-239/240

< 0.09

< 0.11 U-234 U-235

< 0.03

< 0.04 2.8 +/- 0.9

< 0.13 U-238

< 0.10

< 0.18

TABLE B-11.1 COLLECTION SITE DATE DS-2 03/07/17 DS-2 04/23/17 DS-2 08/27/17 DS-2 11/14/17 SG-BW-102 DITCH C 03/07/17 SG-BW-102 DITCH C 05/13/17 SG-BW-102 DITCH C 08/27/17 SG-BW-102 DITCH C 11/14/17 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA AND GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA H-3 Sr-89 Sr-90 Gr-A (Dis)

Gr-A (Sus)

Gr-B (Dis)

< 192

< 5.0

< 0.9

< 1.8

< 0.3 5.8 +/- 1.4

< 176

< 183

< 192

< 191

< 6.0

< 0.5

< 1.0

< 0.6 2.7 +/- 0.9 195 +/- 116

< 182 B-8 Gr-B (Sus)

< 1.6

< 1.4

TABLE B-11.2 COLLECTION SITE DATE Be-7 K-40 DS-2 04/23/17

< 30

< 31 SG-BW-102 DITCH C 05/13/17

< 48

< 57 CJ I co CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF BRAIDWOOD STATION, 2017 RES UL TS IN UNITS OF PCl/LITER +/- 2 SIGMA Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137

< 3

< 8

< 4

< 6

< 4

< 6

< 12

< 3

< 5

< 6

< 13

< 5

< 11

< 7

< 11

< 14

< 7

< 7 Ba-140 La-140

< 25

< 8

< 30

< 11

BW180048, Annual Radiological Environmental Operating Report

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