Text

Annual Radioactive Effluent Release Report (ARERR)
	ML22119A025
Person / Time
Site:	Braidwood
Issue date:	04/29/2022
From:	; Constellation Energy Generation
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
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ML22119A023	List: BW220026, Annual Radioactive Effluent Release Report (ARERR); ML22119A024;
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	BW220026
	Download: ML22119A025 (95)
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Braidwood Nuclear Power Station Annual Radioactive Effluent Release Report (ARERR)

UNIT 1 AND UNIT 2 (Docket Numbers 50-456 and 50-457)

ISFSI (Docket Number 72-73)

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

DOCUMENT INDEX Preface ......................................................................................*............................................................... 2 Introduction ............................................................................................................................................... 9 A. Supplemental Information ........................................................................................................... 9 B. Gaseous Effluents ....................................................................................................................... 15 C. Liquid Effluents ............................................................................................................................ 15 D. Radiological Impact on Man ........................................................................................................ 16 E. Meteorological Data .................................................................................................................... 18 F. Offsite Ambient Radiation Measurements ................................................................................... 18 G. Radioactive Solid Waste Disposal .............................................................................................. 18 APPENDIX A: EFFLUENT AND WASTE DISPOSAL

SUMMARY

.......................................................... 19 APPENDIX B: SOLID WASTE AND IRRADIATED FUEL SHIPMENTS ................................................. 29 APPENDIX C: WIND DIRECTION AND STABILITY CLASSES .............................................................. 36 APPENDIX D: ERRATA ........................................................................................................................... 94 Page 1 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Preface The following sections of the preface are meant to help define key concepts, provide clarity, and give context to the readers of this report.

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

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

The AREOR reports the results of the samples obtained in the environment surrounding the station.

Environmental samples include air, water, vegetation, and other sample types that are identified as potential pathways radioactivity can reach humans.

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

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

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 Wavei.ngth In meters About the s lze ot.

, ~

a,

!Jf.

'&11

.,r*

Builtlng, Grains Protozoans Bacferia Molecukl.-a Al:oma of sugar An atom is the smallest part of an element that maintains the characteristics of that element. Atoms are made up of three parts: protons, neutrons, and electrons.

Graphic

3. Structure of an Atom Neutron--------------~

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

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

Radioactive atoms and isotopes are also referred to as radionuclides and radioisotopes.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

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.

Graphic 4. Radioactive Decay Half-Life Half-life 1000 800 The amount of time it takes for half of the original radioactivity to decay 600 Activity 400 200 0

1 half-life 2 half-lives 3 half-lives 4 half-lives In the annual reports you will see both man made and naturally ocurring radionuclides listed, for example potassium-40 (K-40, natural) and cobalt-60 (Co-60, man-made). We are mostly concerned about man-made radionuclides because they can be produced as by-products when generating electricity at a nuclear power plant. It is important to note that there are also other ways man-made radionuclides are produced, such as detonating nuclear weapons. Weapons testing has deposited some of the same man-made radionuclides into the environment as those generated by nuclear power, and some are still present today because of long half-lives.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Measuring Radiation There are four different but interrelated units for measuring radioactivity, exposure, absorbed dose, and dose equivalent. Together, they are used to scientifically report the amount of radiation and its effects on humans.

Radioactivity refers to the amount of ionizing radiation released by a material. The units of measure for radioactivity used within the AREOR and ARERR are the Curie (Ci). Small fractions of the Ci often have a prefix, such as the microcurie (µCi), which means 1/1,000,000 of a Curie.

Exposure describes the amount of radiation traveling through the air. The units of measure for exposure used within the AREOR and ARERR are the Roentgen (R). Traditionally direct radiation monitors placed around the site are measured milliRoentgen (mR), 1/1,000 of one R.

Absorbed dose describes the amount of radiation absorbed by an object or person. The units of measure for absorbed dose used within the AREOR and ARERR are the rad. Noble gas air doses are reported by the site are measured in millirad (mrad), 1/1,000 of one rad.

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

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

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

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

Industrial and Terrestrial (Soil) - 3%

Occupational lntemal-5% <0.1%

Consumer - 2%

Nuclear Medicine 12%

~ Natural So.urces - 50% - Manmade Sources - 50%

~ ~310 millirem (0.31 rem) ~310 mi11irem (0.31 rem)

Sourc:e: NCRP Import No.100 (2009)

Full re-port is available on the NCRP we'bsfte at www.NCRPomine.org The radiation from a nuclear power plant is included in the chart as part of the "Industrial and Occupational" fraction, <0.1 %. The largest natural source of radiation is from radon, because radon gas travels in the air we breathe. Perhaps you know someone who had a CT scan at a hospital to check his or her bones, brain, or heart. CT scans are included in the chart as "Medical Procedures" which make up the next largest fraction.

Graphic 6 on the following page shows some of the common doses humans receive from radiation every year.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Graphic 6 .Relative Doses from Radiation Sources, from EPA Radiation Doses and Sources RELATIVE DOSES FROM RADIATION SOURCES Whole body er 1,000 mllllrem (single pro,;:edure}

Upper GatltJ'olatatlnal x-ray ClfMIWllhflaorNaipy 600mllllrem

(*Ingle~)

Radon In average u.s. home 228mllllrem (annual)

MMdCT 200 mlllil-wn (single protttdure) co.mk:r~ 11¥1119 hi Denvw (hlgfl~)

appr(ll(lmately 80 mllllrem (11MlUt#)

M~

42mllllrem (single proc:c,dure) C.mlc radlclon living lit -

From lCR.P 2007 lfflll (low *lavatfon) approximately 30 mllllrem (11111111111) lladtetion fll the body

21,1 mllllrem (1tnnu1tl}

Terrestrial radloadlvftr 21 mllllrem

{llllmntlJ Ch!IMx,,ray 10 mltlirem

{ single proceduN}

Living-* IIVdNr power statltln

<1mllllrem (annual)

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

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 '

l Heart Disease i

Smoking - Women Cancer Every 10 lbs overweight Motor Vehicle Accident Chemical Residue in Foods 0 500 1000 1500 2000 2500 Days of Lost Life Expectancy 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Page 8 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Introduction This report quantifies the radioactive gaseous, liquid, solid radioactive waste (radwaste) releases, and summarizes the local meteorological data for the period from January 01, 2021 through December 31, 2021.

This report has been prepared utilizing the methodology and parameters specified in the calculation of offsite doses resulting from radioactive gaseous and liquid effluents found in Braidwood's Offsite Dose Calculation Manual (ODCM). It has been formatted consistent with Exelon Procedure CY-AA-170-2000 "ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT' as well as the requirements specified in Regulatory Guide 1.21 Revision 1, "MEASURING, EVALUATING, AND REPORTING RADIOACTIVITY IN SOLID WASTES AND RELEASES OF RADIOACTIVE MATERIALS IN LIQUID AND GASEOUS EFFLUENTS FROM LIGHT-WATER-COOLED NUCLEAR POWER PLANTS."

The quantity of radioactive material released from Braidwood Nuclear Power Plant was determined from in-house and vendor laboratory analysis of continuous inline sampling media and batch sample media from all ODCM specified effluent pathways. These pathways include continuous releases from the Unit 1 and Unit 2 Station Vent Stack, Condensate Polisher Sump, Waste Water Treatment, and Circulating Water Slowdown.

The ODCM specified effluent pathways also include batch releases from the Unit 1 and Unit 2 Primary Containments, Waste Gas Decay Tanks, and Liquid Radwaste Batch Release Tanks.

The volume and quantity of radioactive waste shipped offsite from Braidwood Nuclear Power Plant for processing and disposal was determined from data maintained in the radwaste shipping database. Radwaste processed for shipment was in accordance with Exelon procedure RW-AA-100, "PROCESS CONTROL PROGRAM FOR RADIOACTIVE WASTES" and consistent with the UFSAR.

Meteorological data was obtained from the 320-foot meteorological tower located on the Braidwood Station premises.

A. Supplemental Information

1. Regulatory Limits

a. Fission and Activation Gases:

Dose Rate

1) Less than 500 mrem/year to the whole body (instantaneous limit, per site).

2) Less than 3,000 mrem/year to the skin (instantaneous limit, per site).

Dose Gamma Radiation

1) Less than or equal to 5 mrad/quarter (per unit).

2) Less than or equal to 1O mrad/year (per unit).

Dose Beta Radiation

1) Less than or equal to 10 mrad/quarter (per unit).

2) Less than or equal to 20 mrad/year (per unit).

b. Iodine: (summed with particulate, see below)

c. Particulates with half-lives > 8 days:

Dose Rate

1) Less than 1,500 mrem/year to any organ (instantaneous limit, per site).

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Dose

1) Less than or equal to 7.5 mrem/quarter to any organ (per unit).

2) Less than or equal to 15 mrem/year to any organ (per unit).

d. Liquid Effluents Dose

1) Less than or equal to 1.5 mrem to the whole body during any calendar quarter (per unit).

2) Less than or equal to 5 mrem to any organ during any calendar quarter (per unit).

3) Less than or equal to 3 mrem to the whole body during any calendar year (per unit).

4) Less than or equal to 10 mrem to any organ during any calendar year (per unit).

2. Effluent Concentration Limits

a. Fission and Activation Gases: 10CFR20 Appendix B Table 2

b. Iodine: 10CFR20 Appendix B Table 2

c. Particulates: 10CFR20 Appendix B Table 2

d. Liquid Effluents: 10 X 10CFR20 Appendix B Table 2

3. Average Energy The ODCM limits the dose equivalent rates due to the release of noble gases to less than or equal to 500 mrem/yr to the total body, and less than or equal to 3,000 mrem/yr to the skin. Therefore, the average beta and gamma energies (E) for gaseous effluents as described in Regulatory Guide 1.21 are not applicable.

4. Measurements and Approximations of Total Radioactivity

a. Fission and activation gases:

Before being discharged, containment batch releases are analyzed for noble gas via gamma spectroscopy. Gaseous decay tanks are analyzed for noble gases before being discharged via gamma spectroscopy. Released activity is normally calculated using volume of release, which is determined by purge flow rate, times the duration of the discharge.

The Auxiliary Building ventilation exhaust system is continually monitored for radioactive iodines (radioiodines) and particulates. These samples are obtained every seven days and analyzed via gamma spectroscopy.

Noble gas samples are obtained and analyzed weekly by gamma spectroscopy. The average flow at the release points and nuclide specific activity concentrations are used to calculate the activity released.

Volumes and activities of effluents discharged from systems that are common to both units are divided between both units.

b. Iodines:

Radioiodines in the Auxiliary Building ventilation exhaust system are continually being collected via activated charcoal cartridges in the diverted sample process flow. The iodine cartridges are pulled weekly and analyzed via gamma spectroscopy. Radioiodine concentrations greater than the lower limit of detection (LLD) are multiplied by the volume of air discharged during the sampling timeframe.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Radioiodines are analyzed in liquid effluent streams through performance of batch release tank grab samples and weekly liquid effluent composite samples. The analyses are performed via gamma spectroscopy of the liquid samples.

Volumes and activities of effluents discharged from systems that are common to both units are divided between both units. Effluents that are unit specific are assigned to the appropriate unit.

c. Particulate, half-lives > 8 days:

Particulates in the Auxiliary Building ventilation exhaust system are continually being collected via filter media in the diverted sample process flow. Particulate filter media is pulled weekly and analyzed via gamma spectroscopy. Particulate concentrations greater than LLD are multiplied by the volume of air discharged during the sampling timeframe. A composite sample is created from 3 month's particulate sample media for Sr-89/90, Fe-55, Ni-63, and gross alpha analysis by an offsite vendor. The vendor supplied data is utilized in conjunction with the volume of air released through the Auxiliary Building ventilation to quantify Sr-89/90, Fe-55, Ni-63, and gross alpha releases.

Volumes and activities of effluents discharged from systems that are common to both units are divided between both units. Effluents that are unit specific are assigned to the appropriate unit.

d. Tritium:

Before being discharged, containment batch releases are analyzed for tritium via a liquid scintillation counter (LSC). Tritium is sampled using a flow-through bubbler system. Released activity is calculated using volume of release, which is determined by purge flow rate multiplied by the duration of the discharge.

The Auxiliary Building ventilation exhaust system is monitored for tritium using a flow-through bubbler system. Tritium is sampled every seven days and analyzed by LSC.

The secondary sides of both units contain tritium. Minimal amounts of tritium are continually released to the atmosphere from secondary components through packing leaks, tank vents, the main condenser, etc. Bounding calculations have been performed to show that large leaks (1000 gallons/day (gpd)) for extended periods (1 month) at normal secondary tritium concentrations would provide an insignificant increase (1.00E-5 mrem) in offsite dose.

e. Gross alpha Gross alpha is analyzed in both the gaseous and liquid effluent pathways. Weekly gaseous particulate media is composited for offsite vendor analysis. Gross alpha activity greater than vendor LLD values are assigned to the applicable timeframe and gaseous volume released. Liquid effluent gross alpha analysis is performed through compositing monthly discharges and gas flow proportional counting.

f. Carbon-14 Carbon-14 (C-14) is assessed in continuous gaseous effluents using Electric Power Research lnstitute's (EPRI) industry accepted production mechanism and production rate study 1021106. C-14 production is a function of each unit's full power operation and gaseous volume released. C-14 is not evaluated through laboratory sample analysis.

g. Liquid effluents:

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Liquid effluents are categorized as either batch release or continuous release. All liquid releases are analyzed for principal gamma emitters, radioiodines, dissolved and entrained gases, gross alpha, and tritium onsite via gamma spectroscopy, gas flow proportional counting, or liquid scintillation, as appropriate. An offsite laboratory analyzes liquid composites for Sr-89/90, Fe-55 and Ni-63. Vendor results are applied to the applicable volume of liquids discharged during the timeframe. Volumes and activities of effluents discharged from systems or locations are divided between both units.

h. Estimated Total Error Present Procedure CY-AA-170-2100, Estimated Errors of Effluent Measurements provides the methodology to obtain an overall estimate of the error associated with radioactive effluents.

Estimated total error is calculated periodically and communicated as part of Appendix A Effluent and Waste Disposal Summary.

i. Lower Limit of Detection (LLD)

Samples are analyzed such that the Offsite Dose Calculation Manual (ODCM) LLD requirements are met. When a nuclide is not detected during the quarter then <LLD is reported. The ODCM required lower limit of detection for airborne and liquid releases are as follows:

Table 4.i ODCM Effluent LLD Values Airborne: LLD Gross Aloha Sr-89 Sr-90 1.00E-11 uCi/cc H-3 1.00E-07 µCi/cc 1-131 in Charcoal Samples 1.00E-12 µCi/cc 1-133 in Charcoal Samples 1.00E-10 µCi/cc Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, Cs-134, Cs-137, 1-131, Ce-141, Ce-144) in Grab Samples 1.00E-04 µCi/cc Principal Gamma Emitters (Mn-54, Fe-59, Co-58, Co-60, Zn-65, Mo-99, 1.00E-11 µCi/cc Cs-134, Cs-137, 1-131, Ce-141, Ce-144) in Particulate Samples Noble Gas (Kr-87, Kr-88, Xe-133, Xe-133m, Xe-135, Xe-138), Gross Beta or Gamma 1.00E-06 µCi/cc Table 4.i ODCM Effluent LLD Values (continued}

Liquid: LLD Principal Gamma Emitters except Ce-144 (Mn-54, Fe-59, Co-58, Co- 5.00E-07 µCi/ml 60 Zn-65 Mo-99 Cs-134 Cs-137 Ce-141)

Ce-144 5.00E-06 µCi/ml 1-131 1.00E-06 µCi/ml Entrained Gases (Kr-87 Kr-88 Xe-133, Xe-133m Xe-135 Xe-138) 1.00E-05 uCi/ml H-3 1.00E-05 µCi/ml Gross Alpha 1.00E-07 µCi/ml Sr-89, Sr-90 5.00E-08 µCi/ml Fe-55 1.00E-06 µCi/ml This list does not mean that only these nuclides are considered, but this list is used to ensure acceptable detection standards. Braidwood tests and maintains LLD records in accordance with procedure CY-AA-130-201 "Radiochemistry Quality Control."

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

5. Batch Releases

a. Liquid Batch Releases 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual

1. Total Number of Batch Releases 28 21 20 21 90

2. Total Time Period for Batch Releases (minutes) 9.471E+04 5.336E+04 4.804E+04 3.009E+04 2.262E+05

3. Maximum Time Period for a Batch Release (minutes) 8.199+03 6.116E+03 5.137E+03 2.665E+03 8.199E+03

4. Average Time Period for a Batch Release (minutes) 3.383E+03 2.541E+03 2.402E+03 1.433E+03 2.513E+03

5. Minimum Time Period for a Batch Release (minutes) 1.058E+03 1.321E+03 1.100E+02 1.330E+02 1.100E+02

6. Average Stream Flow During Periods of Release 5.72E+06 9.78E+06 7.09E+06 1.15E+07 8.52E+06 of Effluent into a Flowing Stream (Liters/min) 1

b. Gaseous Batch Releases 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual

1. Total Number of Batch 141 91 79 84 395 Releases

2. Total Time Period for 1.238E+05 1.680E+04 5.752E+03 2.055E+04 1.669E+05 Batch Releases (minutes)

3. Maximum Time Period for 2.510E+03 4.933E+03 1.493E+03 2.092E+03 4.933E+03 a Batch Release (minutes)

4. Average Time Period for 8.782E+02 1.846E+02 7.281 E+01 2.447E+02 4.226E+02 a Batch Release (minutes)

5. Minimum Time Period for 2.600E+01 2.500E+01 2.600E+01 2.500E+01 2.500E+01 a Batch Release (minutes)

6. Abnormal Releases There were no abnormal gaseous releases that occurred in 2021.

7. Non-Routine, Planned Discharges There were no non-routine, planned discharge in 2021.

8. Radioactive Waste Treatment System Changes There were no changes to the gaseous radioactive waste treatment system, the ventilation exhaust treatment system, or the liquid radioactive waste treatment system in 2021.

1 Kankakee River Flows obtained from US Geological Survey website from daily average flow data.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

9. Changes to the Annual Land Use Census No major changes to the Annual Land Use Census in 2021.

10. Radioactive Effluent Monitoring Instrumentation out of service for more than 30 Days

a. Due to a CW blowdown repair window, 0PR01J and 0PR90J were inoperable for greater than the required restoration time (14 days) as of 1230 on 05/28/21. IR 04425655

11. Revisions to the ODCM No revisions to ODCM occurred in 2021.

12. Independent Spent Fuel Storage Installation (ISFSI)

An Independent Spent Fuel Storage Installation (ISFSI) was placed in service at Braidwood Station in 2011. The ISFSI is a closed system and the only exposure would be due to direct radiation, which is measured by Optically Stimulated Luminescent Dosimetry (OSLO). In 2021 the dose to the nearest resident from the ISFSI was estimated to be 1.80E-01 mrem. This estimate was determined using environmental dosimeters from the Radiological Environmental Monitoring Program and extrapolating the dose from the ISFSI environmental dosimeters.

13. ERRATA (Appendix D)

a. The 2020 ARERR Summary Table for 1-131 included all Iodines and Halogens instead of only 1-131 only.

b. The 2020 ARERR Summary Table for liquid tritium releases contained two transcription errors in Quarter 2 and Quarter 4.

14. Sampling and Instrumentation Issues

a. While performing daily compositor checks, a technician observed that the intermediate compositor jug was empty which is an unexpected condition. It was observed that the jug that collects CP water for ODCM program monitoring was moved and the tubing that siphons water to the compositor was pulled out. The compositor jug will only have water from 4/22/21 to 4/26/21 for the weekly composite.

The jug was repositioned and is sampling correctly. IR 04418484

b. During the weekly 1/2 B AF intake air sampling media change, the technician noted the previous filter media did not have an iodine cartridge installed. The particulate, noble gas and tritium samples were obtained. However, the sampling period from 6/15/21 at 0240 to 6/22/21 at 0214 did not contain an iodine cartridge. No iodine sample results are available for the required monitoring of 1B AF pump run on 6/21/21. Previous weekly samples can be trended for iodines and estimated for inclusion if warranted. New filter media including the particulate filter and iodine cartridge were placed starting 6/22/21 at 0214. IR 04430745

c. On 7/6/21 the CWBD ODCM compositor was found not working. The compositor read "Program complete" on weekly check. Only about 395mL of sample were found in the compositor jug. Looking at the compositor sample history, the last sample to be pulled was on June 28. The compositor was restarted and it was noted that the compositor did not pull a sample at the starting of the program, as it normally does. The sample that was in the composite sampler jug was obtained and counted.

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BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

An observation was performed on a chemistry technician calibrating the volume syphoned every four hours. The compositor showed status "running" prior to volume adjustment/verification. The technician completed the volume adjustment, and it is now sampling the appropriate amount of liquid. IR 04433587

d. CP (Condensate Polisher) Compositor was checked on 10/21/21 and it was discovered that the power was off. The technician verified the compositor was plugged in as it should be and found the GFCI was tripped off. The GFCI was inspected and found SAT on 10/18/21 for quarterly inspection and compositors are checked twice a week. The GFCI was reset and power was restored to the compositor on 10/21/21 at 09:18. The compositor jug did contain some liquid showing that samples were previously being taken. According to the sample log on the compositor, the last sample taken was on 10/19/21 at 23:48. Compositor continued to log missed samples until the battery power ran out. The compositor behaved as expected/designed. IR 04454770

e. While preparing the shipment of U-1/2 PR28J and Aux feed fourth quarter air particulate sample filters to be shipped for offsite analysis, it was discovered that there was not a U2 particulate sample filter for the time frame of 10/25/21 at 2300 to 10/26/21 at 0444 and no Aux feed particulate filter for 10/26/21 at 0140 to 11/2/21 at 0100.

The APEX system used to count all particulate samples was reviewed to search for the missing filters' isotopic analysis. There is no record of any samples counted for those time frames nor were there any samples logged in the counting room log book. These missing filters and the associated volume will not be part of the U1 quarterly composite sent to Teledyne Brown Engineering for the difficult to measure nuclides analysis.

It was noted that the 2PR28J was inoperable during this time when the sample was lost. The aux feed filter media was identified as being wet and may have been discarded as an invalid sample.

IR 04472942

f. A particulate sample for 1PR28J identified Co-58 on the filter. This was included on the permit but is believed to be a contamination issue since it is not normally seen. Sample was taken on 11/7/21 at 1525. The sample was recounted about an hour later with comparable results. The sample isotopic numbers are 48826 and 48829. Samples before and after were both <LLD.

B. Gaseous Effluents Gaseous radioactive releases for 2021 captured in Tables 1A, 1B-1, and 1B-2 in Appendix A for Units 1 and 2 combined. Radioactive noble gases released for the timeframe totaled 5.16E+00 Curies.

Releases of all radioiodines, halogens, and particulates totaled 2.27E-02 Curies. Gaseous tritium releases totaled 7.74E+01 Curies. Gaseous carbon-14 was calculated to total 8.10E+00 Curies. No gross alpha was detected in gaseous effluents.

C. Liquid Effluents Liquid radioactive releases for 2021 are captured in Tables 2A, 2B-1, and 2B-2 in Appendix A for Units 1 and Unit 2 combined. Ninety (90) liquid batch releases occurred during the reporting period. The continuous and batch release discharges contained a total of 3.18E+03 Curies of tritium and 6.90E-02 Curies of fission and activation products. No dissolved or entrained gases, and no gross alpha was detected in the liquid effluents.

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D. Radiological Impact on Man

1. Dose to Members of the Public at or Beyond Site Boundary Per ODCM Chapter 6.1 the Annual Radioactive Effluent Release Report shall include an assessment of radiation doses to the hypothetically highest exposed MEMBER OF THE PUBLIC from reactor releases, ISFSI and other nearby uranium fuel cycle sources. This includes doses from primary effluent pathways and direct radiation for the previous calendar year. The ODCM does not require population doses to be calculated. For purposes of calculation, the following assumptions were made per the ODCM:

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

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

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

A 0. 7 shielding factor was assumed to account for shielding due to occupancy of structures

Doses, Design Objective Limit, and Dose Limit comparisons reported combined for the site for both Unit 1 and Unit 2 together.

Dosimetry measurements obtained from the highest station values in the Radiological Environmental Monitoring Program were used to calculate dose to the nearest residence from the Independent Spent Fuel Storage Installation (ISFSI). The dose measured at the station was extrapolated to the residence location.

The highest doses from the critical organ and critical age group for each release pathway was summed and added to the net dosimetry measurement from nearest residence to the ISFSI for 40CFR 190 and 10CFR72.104 dose compliance.

Evaluation of 40CFR 190 and 10CFR72.104 dose is used to demonstrate compliance to 10CFR 20 and satisfy station RETS and Technical Specifications.

a. Gaseous Releases Calculated total body dose was 2.17E-01 mrem. The critical age-organ was the child-bone and the organ dose was 1.05E+00 mrem.

b. Liquid Releases Calculated total body dose was 2.54E-01 mrem. The critical age-organ was the child-GI-LU and the organ dose was 2.68E-01 mrem.

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c. 40CFR 190 and 10CFR72.104 Compliance The Braidwood ODCM defines the total dose for the uranium fuel cycle as the sum of doses due to radioactivity in airborne and liquid effluents and the doses due to direct radiation from contained sources at the nuclear power station (ODCM A.4.2 Total Dose, Equation A-24). The total dose, vror, in the unrestricted area to a member of the public due to plant operations is given by:

Where:

vror Total Dose to Member of Public [mrem]

Total off-site dose to a member of public due to plant operations.

DEx Total External Total Body Dose [mrem]

Total body dose due to external exposure to noble gases, N-16 skyshine and on-site storage facilities.

D~~q Liquid Effluent Dose [mrem]

Dose due to liquid effluents to age group a and organj. The age group and organ with the highest dose from liquid effluents is used.

v:rc Non-Noble Gaseous Effluent Dose [mrem)Dose due to non-noble gaseous effluents to age group a and organ j. The age group and organ with the highest dose from non-noble gas effluents is used.

The maximum calculated dose to a real individual would not exceed 6.51 E-01 mrem (total body),

1.50E+00 mrem (organ), or 6.52E-01 mrem (thyroid).

Table D.1 Summary of Gaseous and Liquid Effluent Doses to Members of the Public at the Highest Dose Receptors vs 10 CFRS0 Design Objectives Design

%of Objective Maximum Individual Applicable Estimated Age Applicable Limit Unit Noble Gas Dose Dose Group Limit (per year, combined)

Nearest Residence Gamma Air Dose 1.SSE-03 All 7.77E-03 20 mrad Nearest Residence Beta Air Dose 5.64E-04 All 1.41E-03 40 mrad Nearest Residence Total Body 1.48E-03 All 1.48E-02 10 mrem Nearest Residence Skin 2.lSE-03 0

All 7.27E-03 30 mrem Non-Noble Gas Nearest Residence Bone 1.0SE+00 *. Child 3.S0E+00 30 mrem Page 17 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Liquid Nearest Residence Total Body 2.54E-01 Child 4.24E+00 6 mrem Nearest Residence GI-LLI 2.68E-01 Child 1.34E+00 20 mrem Table D.2 Summary of Doses to Members of the Public at the Highest Dose Receptors for 40CFR190 and 10CFR72.104 Compliance Non-Noble External %of Liquid Highest Dose Receptors Gas Direct Total Applicable Limit Unit Effluents Radiation Limit Total Body Dose 2.17E-01 2.54E-01 1.80E-1 6.51 E-01 2.60E+00 25 mrem Organ Dose 1.05E+00 2.68E-01 1.80E-1 1.50E+00 6.00E+00 25 mrem Thyroid Dose 2.19E-01 2.53E-01 1.80E-1 6.52E-01 8.69E-01 75 mrem E. Meteorological Data The Braidwood Station meteorological monitoring program produced 52,494 hours0.00572 days 0.137 hours 8.167989e-4 weeks 1.87967e-4 months of valid data out of a possible 52,560 parameter hours during 2021 (365 days x 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months s/day x 6 measured priority parameters),

which represents an overall data recovery rate of 99.8%. Priority parameters are all parameters except dew point temperature and precipitation. For the year, winds measured at 34 ft. most frequently came from the South (9.29%) and fell into the 3.6 - 7.5 mph wind speed class (38.68%). Calms (wind speeds at or below the sensor threshold) were measured 0.23% of the time and speeds greater than 24.5 mph were measured 0.18% of the time. Stability based on the 199 - 30 ft. differential temperature most frequently fell into the neutral classification (44.35%).

Appendix C contains the Joint Frequency Distribution tables from the Meteorological Data collected in 2021.

F. Offsite Ambient Radiation Measurements Review of the Braidwood Optically Stimulated Luminescent Dosimetry (OSLO) data showed statistical increases above background at only locations related to the ISFSI pad. A dose evaluation was performed taking the highest readings and extrapolating dose to the nearest resident. The dose to the resident was estimated to be 1.80E-1 mrem in 2021. IR 04483926 was written to document issues with the OSLDs collected for 2 nd , 3rd , and 4 th quarters of 2021. Calculations were performed using 1st quarter deploy control readings.

G. Radioactive Solid Waste Disposal Radioactive wastes shipped offsite are captured in the table titled, "Solid Wastes Shipped Offsite for Burial or Disposal (Not irradiated fuel)." Approximately 3.82E+02 cubic meters of solid waste were shipped offsite containing approximately 5.33E+01 Curies during the 2021 reporting period. Appendix B contains tables and detailed information about the Solid Waste Disposal program.

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APPENDIX A: EFFLUENT AND WASTE DISPOSAL

SUMMARY

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TABLE 1A GASEOUS EFFLUENTS- - SUMMATION OF ALL RELEASES UNIT 1 AND UNIT 2 Est. Total Unit 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Error%

A. Fission and Activation Gas Releases

1. Total Release Activity Ci 3.98E+000 7.15E-01 1.04E-01 3.69E-01 5.16E+00 7.59E+00 I

2. Average Release Rate µCi/sec 5.11 E-01 9.10E-02 1.31 E-02 4.64E-02 1.64E-01

3. Percent of ODCM Limit -

gamma % 1.28E-02 1.68E-03 2.97E-04 7.43E-04 7.76E-03

4. Percent of ODCM Limit -

% 2.26E-03 3.41 E-04 5.45E-05 1.61 E-04 1.41E-03 beta B. Iodine 131 Releases

1. Total lodine-131 Ci 1.66E-05 2.42E-07 0.00E+00 9.11E-10 1.68E-05 3.32E+01 I

2. Average Release Rate µCi/sec 2.13E-06 3.07E-08 NIA 1.15E-10 5.33E-07

3. Percent of ODCM Limit 1 % 1.93E+00 1.40E+00 N/A 1.75E+00 3.50E+00 C. Particulate (> 8-day half-life) Releases

1. Particulates with half-life >

Ci <LLD <LLD <LLD 1.22E-04 1.22E-04 1.98E+01 8 days I

2. Average Release Rate µCi/sec <LLD <LLD <LLD 1.537E-05 3.87E-06

3. Percent of ODCM Limit 1 % <LLD <LLD <LLD 1.75E+00 3.50E+00 D. Tritium Releases

1. Total Release Activity Ci 1.86E+01 1.54E+01 9.16E+00 3.42E+01 7.74E+01 8.07E+00 I

2. Average Release Rate µCi/sec 2.40E+00 1.96E+00 1.15E+00 4.31E+00 2.46E+00

3. Percent of ODCM Limit1 1 % 1.93E+00 1.40E+00 1.92E+00 1.75E+00 3.50E+00 E. Gross Alpha Releases

1. Total Release Activity Ci <LLD <LLD <LLD <LLD <LLD 1.98E+01 I

2. Average Release Rate µCi/sec N/A N/A N/A N/A N/A

3. Percent of ODCM limit1 % N/A N/A N/A N/A N/A F. Carbon-14 Releases

1. Total Release Activity Ci 2.24E+00 1.62E+00 2.22E+00 2.02E+00 8.10E+00

2. Average Release Rate µCi/sec 2.88E-01 2.06E-01 2.80E-01 2.54E-01 2.57E-01

3. Percent of ODCM limit1 % 1.93E+00 1.40E+00 1.92E+00 1.75E+00 3.50E+00 Note: ODCM LLD threshold values are included in Table 4.i of this report.

Note: The ODCM Limit is a dose-based limit combined for Iodines, Particulate, Tritium and C-14.

1 Combined Limit per 10CFR50 Appendix I for Organ Dose Due to Specified Non-Noble Gas Radionuclides.

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TABLE 18-1 GASEOUS EFFLUENTS - MIXED MODE RELEASES - CONTINUOUS MODE UNIT 1 AND UNIT 2 Nuclides Released Continuous Mode A. Fission Gases Unit Quarter 1 Quarter2 Quarter 3 Quarter 4 Total Ar-41 Ci <LLD <LLD <LLD <LLD <LLD Kr-85 Ci <LLD <LLD <LLD <LLD <LLD Kr-87 Ci <LLD <LLD <LLD <LLD <LLD Kr-88 Ci <LLD <LLD <LLD <LLD <LLD Xe-131m Ci <LLD <LLD <LLD <LLD <LLD Xe-133 Ci <LLD <LLD <LLD <LLD <LLD Xe-133m Ci <LLD <LLD <LLD <LLD <LLD Xe-135 Ci <LLD <LLD <LLD <LLD <LLD Xe-138 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD . <LLD <LLD <LLD <LLD

. .. ' i* .

. . /

B. Iodines / Halogens Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Br-82 Ci 4.60E-04 1.66E-03 <LLD 5.30E-05 2.17E-03 1-131 Ci 8.35E-06 <LLD <LLD <LLD 8.35E-06 1-132 Ci <LLD <LLD <LLD <LLD <LLD 1-133 Ci 3.04E-05 <LLD <LLD <LLD 3.04E-05 1-134 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci 4.99E-04 1.66E-03 <LLD 5.30E-05 2.21 E-03 C. Particulates Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Mn-54 Ci <LLD <LLD <LLD <LLD <LLD Co-57 Ci <LLD <LLD <LLD <LLD <LLD Co-58 Ci <LLD <LLD <LLD 1.22E-04 1.22E-04 Fe-59 Ci <LLD <LLD <LLD <LLD <LLD Co-60 Ci <LLD <LLD <LLD <LLD <LLD Zn-65 Ci <LLD <LLD <LLD <LLD <LLD Sr-89 Ci <LLD <LLD <LLD <LLD <LLD Sr-90 Ci <LLD <LLD <LLD <LLD <LLD Mo-99 Ci <LLD <LLD <LLD <LLD <LLD Cs-134 Ci <LLD <LLD <LLD <LLD <LLD Cs-137 Ci <LLD <LLD <LLD <LLD <LLD Ba-140 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD 1.22E-04 1.22E-04 TABLE 18-1 (Cont.)

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GASEOUS EFFLUENTS - MIXED MODE RELEASES - CONTINUOUS MODE UNIT 1 AND UNIT 2 uclides Released Continuous Mode E. Carbon-14 Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci 2.24E+00 1.62E+00 2.22E+00 2.02E+0O 8.10E+00 22 of 94

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TABLE 18-2 GASEOUS EFFLUENTS- MIXED MODE RELEASES- BATCH MODE UNIT 1 AND UNIT 2 lides Released Batch Mode A. Fission Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ar-41 Ci 3.95E+00 4.90E-01 9.12E-02 2.17E-01 4.75E+00 Kr-85 Ci <LLD <LLD <LLD <LLD <LLD Kr-85m Ci <LLD 4.55E-03 <LLD 6.86E-04 5.24E-03 Kr-87 Ci <LLD 1.93E-03 <LLD <LLD 1.93E-03 Kr-88 Ci <LLD 4.59E-03 <LLD <LLD 4.59E-03 Xe-131m Ci <LLD <LLD <LLD <LLD <LLD Xe-133 Ci 2.46E-02 1.57E-01 1.30E-02 1.13E-01 3.08E-01 Xe-133m Ci <LLD <LLD <LLD <LLD <LLD Xe-135 Ci 3.49E-03 5.66E-02 <LLD 3.76E-02 9.77E-02 Xe-135m Ci <LLD <LLD <LLD <LLD <LLD Xe-138 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci 3.98E+00 7.15E-01 1.04E-01 3.69E-01 5.16E+00

/ . . ..

B. Iodines / Halogens Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Br-80 Ci 1.96E-02 2.73E-05 6.81 E-05 3.89E-04 2.00E-02 Br-82 Ci 2.81 E-04 1.54E-05 1.24E-05 4.79E-05 3.57E-04 1-131 Ci 8.21 E-06 2.42E-07 <LLD 9.11E-10 8.45E-06 1-132 Ci <LLD 5.02E-06 3.04E-08 3.61 E-07 5.41 E-06 1-133 Ci 2.52E-05 6.55E-07 2.40E-09 <LLD 2.58E-05 1-135 Ci 6.05E-07 <LLD <LLD <LLD 6.05E-07 Total for Period Ci 1.99E-02 4.87E-05 8.05E-05 4.37E-04 2.04E-02 C. Particulates Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Mn-54 Ci <LLD <LLD <LLD <LLD <LLD Co-57 Ci <LLD <LLD <LLD <LLD <LLD Co-58 Ci <LLD <LLD <LLD <LLD <LLD Fe-59 Ci <LLD <LLD <LLD <LLD <LLD Co-60 Ci <LLD <LLD <LLD <LLD <LLD Zn-65 Ci <LLD <LLD <LLD <LLD <LLD Sr-89 Ci <LLD <LLD <LLD <LLD <LLD Sr-90 Ci <LLD <LLD <LLD <LLD <LLD Mo-99 Ci <LLD <LLD <LLD <LLD <LLD Cs-134 Ci <LLD <LLD <LLD <LLD <LLD Cs-137 Ci <LLD <LLD <LLD <LLD <LLD 23 of 94

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TABLE 1B-2 (Cont.)

GASEOUS EFFLUENTS - MIXED MODE RELEASES - BATCH MODE UNIT 1 AND UNIT 2 Nuclides Released Batch Mode C. Particulates (Cont.) Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ba-140 Ci <LLD <LLD <LLD <LLD <LLD La-140 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD <LLD <LLD D. Tritium Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci 8.49E+00 1.01 E+00 6.96E-01 5.55E+00 1.5E+01 E. Gross Alpha Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci <LLD <LLD <LLD <LLD <LLD F. Carbon-14 Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci <LLD <LLD <LLD <LLD <LLD 24 of 94

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TABLE 2A LIQUID EFFLUENTS- - SUMMATION OF ALL RELEASES UNIT 1 AND UNIT 2 Est.

Unit 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Total Error%

A. Fission and Activation Products

1. Total Release Ci 6.69E-03 2.30E-02 1.77E-02 2.16E-02 6.90E-02 2.64E+ool

2. Average Diluted Concentration µCi/ml 3.47E-10 2.40E-09 1.14E-09 1.86E-09 1.23E-09

3. Percent of applicable limit % * * * *

B. Tritium

1. Total Release Ci 1.49E+03 7.54E+02 5.34E+02 4.00E+02 3.18E+03 5.85E+ool

2. Average Diluted Concentration µCi/ml 7.73E-05 7.87E-05 3.43E-05 3.46E-05 5.67E-05

3. % of Limit (1 E-2 µCi/ml) % 7.73E-01 7.87E-01 3.43E-01 3.46E-01 5.67E-01 C. Dissolved Noble Gases

1. Total Release Ci <LLD <LLD <LLD <LLD <LLD 2.64E+ool

2. Average Diluted Concentration µCi/ml N/A N/A N/A N/A N/A

3. % of Limit (2E-4 µCi/ml) % N/A N/A N/A N/A N/A D. Gross Alpha

1. Total Release Ci <LLD <LLD <LLD <LLD <LLD 1.47E+01 I

2. Average Diluted Concentration µCi/ml NIA NIA NIA N/A NIA E. Volume of Waste Released Liters 1.05E+10 6.59E+09 1.13E+10 9.50E+09 3.78E+10 rior to dilution IF. Volume of Dilution Water I Liters I 8.81 E+09 l2.99E+09 I 4.32E+09 j 2.08E+09 I 1.82E+10 I IG. Average Stream Flow 1 I m3/s I 9.53E+01 I 1.63E+02 I 1.18E+02 j 1.91 E+02 I 1.42E+02 I Note: ODCM LLD threshold values are included in Table 4. i of this report.

This limit is equal to 10 times the concentration values in Appendix B, Table 2, Column 2 to 10CFR20.1001-20.2402, except for Dissolved Noble Gases. The limits for Dissolved Noble Gases are found the Braidwood Station ODCM, Table C-6 of ODCM Appendix C for Noble Gases.

1 Kankakee River Flows obtained from US Geological Survey website from daily average flow data.

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TABLE 28-1 LIQUID EFFLUENTS - CONTINUOUS MODE UNIT 1 AND UNIT 2 Nuclides Released Continuous Mode A. Fission and Activation Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Total Products Mn-54 Ci <LLD <LLD <LLD <LLD <LLD Fe-55 Ci <LLD <LLD <LLD <LLD <LLD Fe-59 Ci <LLD <LLD <LLD <LLD <LLD Co-58 Ci <LLD <LLD <LLD <LLD <LLD Co-60 Ci <LLD <LLD <LLD <LLD <LLD Zn-65 Ci <LLD <LLD <LLD <LLD <LLD Cs-134 Ci <LLD <LLD <LLD <LLD <LLD Cs-137 Ci <LLD <LLD <LLD <LLD <LLD Ce-141 Ci <LLD <LLD <LLD <LLD <LLD Ce-144 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD <LLD <LLD B. Tritium Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci 1.41 E+02 2.44E+02 9.17E+00 5.61 E-00 3.99E+02 C. Dissolved and Entrained Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Kr-87 Ci <LLD <LLD <LLD <LLD <LLD Kr-88 Ci <LLD <LLD <LLD <LLD <LLD Xe-133 Ci <LLD <LLD <LLD <LLD <LLD Xe-133m Ci <LLD <LLD <LLD <LLD <LLD Xe-135 Ci <LLD <LLD <LLD <LLD <LLD Xe-138 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD <LLD <LLD D. Gross Alpha Unit Quarter 1 Quarter 2 Quarter 3 Quarter4 Total Ci <LLD <LLD <LLD <LLD <LLD 26 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

TABLE 2B-2 LIQUID EFFLUENTS - BATCH MODE UNIT 1 AND UNIT 2 Nuclides Released Batch Mode A. Fission and Activation Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Products Cr-51 Ci <LLD 4.87E-03 7.93E-04 4.18E-03 9.84E-03 Mn-54 Ci 4.58E-05 2.52E-04 2.65E-04 1.72E-04 7.34E-04 Fe-55 Ci <LLD 4.00E-03 2.04E-03 2.93E-03 8.97E-03 Fe-59 Ci <LLD 2.90E-05 1.35E-05 9.45E-04 9.87E-04 Co-57 Ci <LLD <LLD 2.97E-05 1.20E-05 4.17E-05 Co-58 Ci 4.60E-04 4.01 E-03 7.81 E-03 8.82E-03 2.11 E-02 Co-60 Ci 2.01E-03 7.33E-03 5.19E-03 3.49E-03 1.S0E-02 Ni-63 Ci 2.0SE-03 <LLD <LLD <LLD 2.05E-03 Ni-65 Ci <LLD 1.04E-04 1.73E-04 <LLD 2.76E-04 Zn-65 Ci <LLD 2.60E-05 4.33E-05 <LLD 6.93E-05 Sr-89 Ci 1.20E-03 <LLD <LLD <LLD 1.20E-03 Sr-92 Ci <LLD 1.0SE-04 7.40E-06 <LLD 1.12E-04 Zr-95 Ci <LLD 1.41 E-04 1.35E-04 1.32E-04 4.0SE-04 Nb-95 Ci <LLD 4.50E-04 3.20E-04 3.43E-04 1.11 E-03 Nb-97 Ci <LLD <LLD <LLD <LLD <LLD Mo-99 Ci <LLD <LLD <LLD <LLD <LLD Tc-99m Ci <LLD <LLD <LLD <LLD <LLD Ru-105 Ci <LLD <LLD <LLD 3.07E-05 3.07E-05 Ag-11 Om Ci 9.32E-05 1.03E-03 6.31 E-04 4.18E-04 2.17E-03 Sn-113 Ci <LLD 5.94E-05 4.75E-05 1.33E-05 1.20E-04 Sb-122 Ci <LLD <LLD <LLD <LLD <LLD Sb-124 Ci <LLD <LLD <LLD <LLD <LLD Sb-125 Ci 8.33E-04 4.14E-04 2.06E-04 9.43E-05 1.55E-03 Sb-126 Ci <LLD <LLD <LLD <LLD <LLD Te-123m Ci <LLD <LLD <LLD <LLD <LLD Te-125m Ci <LLD <LLD <LLD <LLD <LLD Te-129m Ci <LLD <LLD <LLD <LLD <LLD 1-134 Ci <LLD 1.13E-04 2.29E-05 <LLD 1.36E-04 Cs-134 Ci <LLD <LLD <LLD <LLD <LLD Cs-136 Ci <LLD <LLD 5.86E-07 <LLD 5.86E-07 Cs-137 Ci <LLD <LLD <LLD <LLD <LLD W-187 Ci <LLD 2.S0E-05 <LLD <LLD 2.S0E-05 Total for Period Ci 6.69E-03 2.30E-02 1.77E-02 2.16E-02 6.90E-02 27 of 94

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B. Tritium Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Ci 1.35E+03 5.10E+02 5.25E+02 3.95E+02 2.78E+03 C. Dissolved and Entrained Gases Unit Quarter 1 Quarter 2 Quarter 3 Quarter 4 Total Kr-87 Ci <LLD <LLD <LLD <LLD <LLD Kr-88 Ci <LLD <LLD <LLD <LLD <LLD Xe-133 Ci <LLD <LLD <LLD <LLD <LLD Xe-133m Ci <LLD <LLD <LLD <LLD <LLD Xe-135 Ci <LLD <LLD <LLD <LLD <LLD Xe-138 Ci <LLD <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD <LLD <LLD TABLE 2B-2 (Cont.)

LIQUID EFFLUENTS - BATCH MODE UNIT 1 AND UNIT 2 Nuclides Released Batch Mode D. Gross Alpha Unit Quarter1 Quarter 2 Quarter 3 Quarter 4 Total Ci <LLD <LLD <LLD <LLD <LLD 28 of 94

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APPENDIX B: SOLID WASTE AND IRRADIATED FUEL SHIPMENTS 29 of 94

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A Solid Waste Shipped Offsite for Burial or Disposal (Not Irradiated Fuel)

1. Low-Level Waste Resins, Filters, And Evaporator Bottoms Waste Volume Curies Class ft3 ma Shipped A 3.74E+03 1.06E+02 2.13E+01 B 0.00E+00 0.00E+00 0.00E+00 C 4.24E+01 1.20E+00 3.08E+01 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 3.78E+03 1.07E+02 5.20E+01 Major Nuclides for the Above Table:

H-3, C-14, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Sr-90, Zr-95, Nb-94, Nb-95, Tc-99, Sb-125, I-129, Cs-137, Ce-144, Th-230, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Dry Active Waste (DAW)

Waste Volume Curies Class ft3 m3 Shipped A 8.41 E+03 2.38E+02 1.18E+00 B 7.40E-01 2.10E-02 8.04E-02 C 0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 8.41 E+03 2.38E+02 1.26E+00 Major Nuclides for the Above Table:

H-3, C-14, Cr-51, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Sr-90, Zr-95, Nb-94, Nb-95, Tc-99, Sb-125, 1-129, Cs-137, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Irradiated Components Waste Volume Curies Class ft3 ma Shipped A 0.00E+00 0.00E+00 0.00E+00 B 0.00E+00 0.00E+00 0.00E+00 C 0.00E+00 0.00E+00 0.00E+00 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 0.00E+00 0.00E+00 0.00E+00 Major Nuclides for the Above Table: None 30 of 94

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1. Low-Level Waste (continued)

Other Waste Waste Volume Curies Class ft3 m3 Shipped A 1.29E+03 3.64E+01 2.49E-02 B 0.00E+00 0.00E+00 0.00E+00 C 8.06E-01 2.28E-02 1.73E-05 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 1.29E+03 3.65E+01 2.49E-02 Major Nuclides for the Above Table:

H-3, C-14, Cr-51, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Sr-90, Zr-95, Nb-95, Tc-99, Sb-125, 1-129, Cs-137, Th-230, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 Sum of All Low-Level Waste Shipped from Site Waste Volume Curies Class ft3 m3 Shipped A 1.34E+04 3.80E+02 2.25E+01 B 7.40E-01 2.10E-02 8.04E-02 C 4.32E+01 1.22E+00 3.08E+01 Unclassified 0.00E+00 0.00E+00 0.00E+00 All 1.35E+04 3.82E+02 5.33E+01 Major Nuclides for the Above Table:

H-3, C-14, Cr-51, Mn-54, Fe-55, Co-58, Co-60, Ni-59, Ni-63, Sr-90, Zr-95, Nb-95, Tc-99, Sb-125, 1-129, Cs-137, Ce-144, Th-230, Pu-238, Pu-239, Pu-241, Am-241, Cm-242, Cm-243, Cm-244 31 of 94

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2. Estimate of Major Nuclide Composition (By Waste Type and Class)

a. Category A - Spent Resins, Filter Sludges, Evaporator Bottoms, etc.

Waste Class A Percent Waste Class C Percent Isotope Curies Abundance Curies Abundance H-3 5.61E+00 26.38% 1.48E-01 0.48%

C-14 1.97E-02 0.09% 2.68E-02 0.09%

Cr-51 1.85E-03 0.01% 2.02E-06 0.00%

Mn-54 6.69E-01 3.14% 1.37E-01 0.45%

Fe-55 5.79E-01 2.72% 1.52E+01 49.21%

Fe-59 NA 0.00% 2.00E-05 0.00%

Co-57 4.71 E-02 0.22% 7.25E-03 0.02%

Co-58 7.46E-01 3.51% 1.28E-02 0.04%

Co-60 5.58E+00 26.24% 7.54E+00 24.47%

Ni-59 1.43E-01 0.67% 1.78E-01 0.58%

Ni-63 7.09E+00 33.36% 7.03E+00 22.82%

Zn-65 1.33E-01 0.63% 1.68E-02 0.05%

Sr-89 7.96E-05 0.00% 5.40E-07 0.00%

Sr-90 1.97E-03 0.01% 1.39E-02 0.04%

Zr-95 2.98E-02 0.14% 1.34E-03 0.00%

Nb-94 NA 0.00% 7.38E-03 0.02%

Nb-95 5.20E-02 0.24% 2.97E-03 0.01%

Tc-99 1.29E-05 0.00% 6.96E-02 0.23%

Ru-103 NA 0.00% 5.30E-20 0.00%

Ag-11 Om 4.30E-03 0.02% 8.57E-03 0.03%

Sn-113 4.67E-03 0.02% 3.93E-03 0.01%

Sn-117m 1.89E-06 0.00% 1.56E-17 0.00%

Sb-124 2.25E-03 0.01% 1.08E-05 0.00%

Sb-125 4.13E-01 1.94% 2.08E-01 0.68%

1-129 NA 0.00% 5.31 E-06 0.00%

Cs-134 4.88E-03 0.02% 3.80E-03 0.01%

Cs-137 1.22E-01 0.57% 1.40E-01 0.46%

Ce-144 6.59E-03 0.03% 4.0?E-04 0.00%

Eu-154 NA 0.00% 1.18E-02 0.04%

Hf-181 NA 0.00% 1.46E-07 0.00%

Pu-238 1.54E-05 0.00% 2.01 E-03 0.01%

Pu-239 7.09E-08 0.00% 6.54E-04 0.00%

Pu-241 2.13E-03 0.01% 7.58E-02 0.25%

Am-241 3.03E-05 0.00% 1.04E-03 0.00%

Cm-242 NA 0.00% 3.55E-06 0.00%

Cm-243 NA 0.00% 1.30E-03 0.00%

Cm-244 3.31 E-05 0.00% 7.44E-05 0.00%

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b. Category B - Dry Compressible Waste, Contaminated Equip, etc.

Waste Class Percent Waste Class Percent Isotope A Curies Abundance B Curies Abundance H-3 4.71 E-02 3.99% 1.49E-06 0.00%

C-14 3.23E-02 2.74% 2.65E-03 3.30%

Cr-51 1.29E-02 1.10% NA 0.00%

Mn-54 3.36E-03 0.28% 1.77E-11 0.00%

Fe-55 8.93E-02 7.56% 6.07E-04 0.76%

Fe-59 1.52E-03 0.13% NA 0.00%

Co-57 3.65E-04 0.03% 3.00E-13 0.00%

Co-58 4.57E-02 3.87% 6.71 E-39 0.00%

Co-60 1.61 E-01 13.64% 3.83E-03 4.76%

Ni-59 4.BBE-03 0.41% 1.53E-04 0.19%

Ni-63 7.01 E-01 59.36% 6.69E-02 83.24%

Zn-65 8.49E-04 0.07% NA 0.00%

Sr-89 7.68E-28 0.00% NA 0.00%

Sr-90 3.49E-04 0.03% 2.25E-06 0.00%

Zr-95 6.25E-03 0.53% NA 0.00%

Nb-94 3.17E-05 0.00% NA 0.00%

Nb-95 6.45E-03 0.55% 9.89E-80 0.00%

Tc-99 8.92E-04 0.08% 1.20E-06 0.00%

Ag-110m 4.92E-04 0.04% NA 0.00%

Sn-113 4.63E-04 0.04% NA 0.00%

Sb-125 3.06E-03 0.26% 1.83E-05 0.02%

1-129 9.20E-06 0.00% 1.39E-06 0.00%

Cs-134 1.72E-04 0.01% 4.76E-07 0.00%

Cs-137 6.13E-02 5.19% 6.19E-03 7.70%

Ce-144 3.79E-04 0.03% 2.66E-13 0.00%

Pu-238 1.41 E-05 0.00% 3.42E-07 0.00%

Pu-239 6.11 E-06 0.00% 3.76E-07 0.00%

Pu-241 5.89E-04 0.05% 1.70E-05 0.02%

Am-241 1.07E-05 0.00% 4.56E-07 0.00%

Cm-242 1.65E-06 0.00% 3.86E-23 0.00%

Cm-243 1.19E-05 0.00% NA 0.00%

Cm-244 1.16E-05 0.00% 2.63E-07 0.00%

c. Category C - Irradiated Components, Control Rods, etc.

None 33 of 94

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d. Category D - Other (Oil, Reverse Osmosis Reject Water, Soil, Lagoon Sediment)

Waste Class Percent Waste Class Percent Isotope A Curies Abundance C Curies Abundance H-3 5.36E-03 21.46% NA 0.00%

Na-22 NA 0.00% 2.04E-07 1.18%

Cr-51 1.33E-03 5.34% 8.18E-21 0.00%

Mn-54 3.01 E-04 1.20% 4.97E-09 0.03%

Fe-55 5.32E-03 21.34% NA 0.00%

Fe-59 1.51 E-04 0.61% 2.86E-16 0.00%

Co-57 3.30E-05 0.13% 8.49E-12 0.00%

Co-58 4.45E-03 17.84% 3.17E-13 0.00%

Co-60 3.98E-03 15.94% 1.56E-07 0.90%

Ni-59 8.13E-05 0.33% NA 0.00%

Ni-63 2.24E-03 8.98% NA 0.00%

Zn-65 7.74E-05 0.31% 2.64E-09 0.02%

Sr-85 NA 0.00% 1.29E-24 0.00%

Sr-90 4.32E-06 0.02% NA 0.00%

Y-88 NA 0.00% 2.24E-17 0.00%

Zr-95 6.11E-04 2.45% NA 0.00%

Nb-95 6.06E-04 2.43% NA 0.00%

Tc-99 3.52E-05 0.14% 4.33E-08 0.25%

Cd-109 NA 0.00% 1.83E-08 0.11%

Ag-110m 4.47E-05 0.18% NA 0.00%

Sn-113 4.40E-05 0.18% 7.76E-17 0.00%

Sb-125 2.03E-04 0.81% NA 0.00%

Cs-134 NA 0.00% 3.53E-08 0.20%

Cs-137 4.05E-05 0.16% 8.18E-06 47.22%

Ba-133 NA 0.00% 7.67E-06 44.24%

Ce-139 NA 0.00% 1.58E-15 0.00%

Ce-141 NA 0.00% 3.16E-19 0.00%

Ce-144 2.53E-05 0.10% NA 0.00%

Eu-155 NA 0.00% 5.97E-07 3.45%

Hg-203 NA 0.00% 1.07E-30 0.00%

Th-230 NA 0.00% 4.78E-08 0.28%

Pu-238 3.16E-07 0.00% NA 0.00%

Pu-241 1.17E-05 0.05% NA 0.00%

Am-241 2.68E-07 0.00% 3.69E-07 2.13%

Cm-242 1.54E-07 0.00% NA 0.00%

Cm-243 4.74E-07 0.00% NA 0.00%

Cm-244 4.39E-07 0.00% NA 0.00%

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3. Solid Waste Disposition Number of Mode of Transportation Destination Shipments 1 Hittman Transportation Energy Solutions - Memphis 1790 Dock St.

5 Hittman Transportation Energy Solutions Services - Gallaher Rd 628 Gallaher Rd.

7 Hittman Transportation Energy Solutions-Bear Creek Facility 1560 Bear Creek Road 4 Hittman Transportation EnergySolutions LLC.

Clive Disposal Site - Containerized Waste Facility 1 Hittman Transportation Waste Control Specialists LLC Compact Waste Disposal Facility 1 Interstate Ventures Energy Solutions Services - Gallaher Rd 628 Gallaher Rd.

1 Interstate Ventures Energy Solutions-Bear Creek Facility 1560 Bear Creek Road 1 Landstar lnway Energy Solutions Services - Gallaher Rd 628 Gallaher Rd.

1 Landstar lnway Energy Solutions-Bear Creek Facility 1560 Bear Creek Road B. Irradiated Fuel Shipments None C. Irradiated Fuel Shipments (disposition)

No irradiated fuel shipments were dispositioned at Braidwood during January through December 2021.

D. Changes to the Process Control Program (PCP)

There were no Process Control Changes in 2021.

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APPENDIX C: WIND DIRECTION AND STABILITY CLASSES 36 of 94

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WIND STABILITY CLASSES Table C-4 Atmospheric Stabitity Classes Temperature Change Description Pasguill Stabifity Class "ua(degrees) with Height(°Cl'l 00 m}

Extremely Unstable A >22_5 < -1.9 Moderately Unstable B 17.5 to 22_5 -1.9 to-1.7 Slightly Unstable C 12.5 to 17.5 -1.7to-1.5 Neutral D 1.5 to 12.5 -1.5 to-0.5 Sfighfly Stable E 3.8 to 7.5 -0.5 to 1_5 Moderately Stable F 2.1 to 3.8 1.5 to 4.0 Extremely Stable G 0 to2.1 >4.0 "c;:9 is the standard deviation of horizontal wind direction fluctuation over a period of 15 minutes to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

From Regulatory Guide 1.21, Table 4B.

Atmospheric Stability Classes, Table C-4 from Braidwood ODCM.

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Period of Record: January - March 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 1 0 0 0 1 ENE 0 2 2 0 0 0 4 E 0 1 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 0 0 1 SSE 0 1 2 0 0 0 3 s 0 0 6 9 0 0 15 SSW 0 0 0 5 0 0 5 SW 0 0 0 1 0 0 1 WSW 0 0 0 2 0 0 2 w 0 0 0 0 0 0 0 WNW 0 0 6 9 0 0 15 NW 0 2 9 4 0 0 15 NNW 0 3 9 0 0 0 12 Variable 0 0 0 0 0 0 0 Total 0 9 36 30 0 0 75 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 38 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 1 5 0 0 0 6 ENE 0 1 1 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 2 1 0 0 3 SSE 0 2 4 0 0 0 6 s 0 1 5 3 0 1 10 SSW 0 0 2 4 0 1 7 SW 0 0 0 1 2 0 3 WSW 0 0 0 2 0 0 2 w 0 2 1 2 0 0 5 WNW 0 6 2 2 0 0 10 NW 0 10 6 0 0 0 16 NNW 0 8 9 0 0 0 17 Variable 0 0 0 0 0 0 0 Total 0 31 37 15 2 2 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 39 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 0 0 0 5 NNE 0 2 0 0 0 0 2 NE 1 1 4 1 0 0 7 ENE 1 3 2 1 0 0 7 E 2 0 0 0 0 0 2 ESE 0 1 0 0 0 0 1 SE 0 1 6 0 0 0 7 SSE 0 7 2 0 0 0 9 s 0 0 1 2 2 0 5 SSW 0 0 1 1 1 0 3 SW 0 2 3 0 1 0 6 WSW 1 1 2 2 0 0 6 w 1 7 4 3 0 0 15 WNW 2 6 4 1 0 0 13 NW 2 3 1 0 0 0 6 NNW 0 4 16 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 10 40 49 11 4 0 114 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 40 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 7 40 23 1 0 0 71 NNE 13 23 18 7 0 0 61 NE 15 31 32 14 9 0 101 ENE 13 23 23 5 0 0 64 E 11 14 10 6 0 0 41 ESE 1 18 19 2 0 0 40 SE 1 19 33 15 0 0 68 SSE 6 12 22 7 0 0 47 s 6 5 17 25 5 2 60 SSW 1 4 11 17 6 3 42 SW 8 7 34 21 1 0 71 WSW 6 18 35 9 0 0 68 w 7 45 42 20 13 0 127 WNW 12 55 39 23 1 0 130 NW 10 35 9 0 0 0 54 NNW 17 63 69 0 0 0 149 Variable 0 0 0 0 0 0 0 Total 134 412 436 172 35 5 1194 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 24 Hours of missing stability measurements in all stability classes: 3 41 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 4 1 0 0 0 13 NNE 5 7 3 0 0 0 15 NE 2 4 1 0 0 0 7 ENE 10 4 0 0 0 0 14 E 15 4 0 0 0 0 19 ESE 12 41 1 0 0 0 54 SE 5 29 6 1 0 0 41 SSE 3 14 11 2 0 0 30 s 1 8 28 9 1 0 47 SSW 1 4 10 10 1 0 26 SW 1 7 23 6 0 0 37 WSW 3 13 11 0 0 0 27 w 8 20 11 4 1 0 44 WNW 12 26 14 1 0 0 53 NW 15 17 0 0 0 0 32 NNW 6 11 3 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 107 213 123 33 3 0 479 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 15 Hours of missing stability measurements in all stability classes: 3 42 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 0 0 0 0 2 NNE 8 2 0 0 0 0 10 NE 3 0 0 0 0 0 3 ENE 5 0 0 0 0 0 5 E 12 2 0 0 0 0 14 ESE 4 7 0 0 0 0 11 SE 1 3 0 0 0 0 4 SSE 1 2 0 0 0 0 3 s 0 2 0 0 0 0 2 SSW 2 4 5 0 0 0 11 SW 3 2 3 0 0 0 8 WSW 3 3 1 0 0 0 7 w 4 14 0 0 0 0 18 WNW 14 5 0 0 0 0 19 NW 11 1 0 0 0 0 12 NNW 1 1 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 73 49 9 0 0 0 131 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 7 Hours of missing stability measurements in all stability classes: 3 43 of 94

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Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 0 0 0 0 0 2 NNE 2 0 0 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 2 0 0 0 0 0 2 E 1 0 0 0 0 0 1 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 2 0 0 0 0 0 2 w 6 1 0 0 0 0 7 WNW 5 2 0 0 0 0 7 NW 1 0 0 0 0 0 1 NNW 3 0 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 24 4 0 0 0 0 28 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 44 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 1 0 0 0 1 ENE 0 0 3 1 0 0 4 E 0 1 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 0 0 1 SSE 1 0 2 0 0 0 3 s 0 0 0 9 6 0 15 SSW 0 0 0 2 4 0 6 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 2 0 2 w 0 0 0 0 0 0 0 WNW 0 0 0 7 7 0 14 NW 0 1 3 7 0 4 15 NNW 0 0 9 4 0 0 13 Variable 0 0 0 0 0 0 0 Total 1 2 19 30 19 4 75 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 45 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 5 1 0 0 6 ENE 0 1 0 1 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 1 1 1 0 3 SSE 1 1 4 1 0 0 7 s 0 0 4 2 3 0 9 SSW 0 0 0 5 0 2 7 SW 0 0 0 0 1 2 3 WSW 0 0 0 0 2 0 2 w 0 0 2 1 1 0 4 WNW 0 1 5 1 2 0 9 NW 0 3 9 6 0 0 18 NNW 0 2 10 5 0 0 17 Variable 0 0 0 0 0 0 0 Total 1 8 40 24 10 4 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 46 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 1 0 0 6 NNE 0 0 1 0 0 0 1 NE 0 2 3 1 1 0 7 ENE 0 2 1 1 1 0 5 E 0 3 0 1 0 0 4 ESE 1 0 0 0 0 0 1 SE 0 1 2 4 0 0 7 SSE 0 3 5 2 0 0 10 s 0 0 0 2 1 2 5 SSW 0 1 1 1 1 1 5 SW 0 0 1 1 0 1 3 WSW 1 1 2 0 3 0 7 w 1 1 4 0 2 0 8 WNW 0 4 8 2 0 0 14 NW 1 4 3 1 1 0 10 NNW 0 1 7 13 0 0 21 Variable 0 0 0 0 0 0 0 Total 4 25 41 30 10 4 114 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 47 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 19 36 23 1 0 84 NNE 6 15 29 5 5 4 64 NE 8 15 29 24 12 17 105 ENE 12 17 11 15 3 0 58 E 5 12 17 3 4 6 47 ESE 1 2 11 14 8 1 37 SE 1 2 17 20 19 3 62 SSE 6 4 13 21 8 0 52 s 5 2 12 14 20 12 65 SSW 3 2 1 17 18 18 59 SW 8 3 11 28 6 2 58 WSW 5 5 31 19 7 0 67 w 5 5 52 21 19 14 116 WNW 13 5 48 31 21 4 122 NW 9 9 27 12 9 2 68 NNW 15 10 65 55 0 0 145 Variable 0 0 0 0 0 0 0 Total 107 127 410 322 160 83 1209 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 9 Hours of missing stability measurements in all stability classes: 3 48 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 7 7 3 0 0 19 NNE 0 3 7 3 0 0 13 NE 0 1 12 3 0 0 16 ENE 1 9 4 0 0 0 14 E 0 7 12 0 0 0 19 ESE 6 3 6 20 0 0 35 SE 2 3 21 21 2 0 49 SSE 1 0 11 15 5 0 32 s 1 1 11 20 14 2 49 SSW 1 0 4 16 18 2 41 SW 1 1 7 9 11 0 29 WSW 1 8 9 14 0 0 32 w 0 0 9 12 6 1 28 WNW 1 2 14 24 3 0 44 NW 0 3 18 14 0 0 35 NNW 0 6 20 8 0 0 34 Variable 0 0 0 0 0 0 0 Total 17 54 172 182 59 5 489 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 5 Hours of missing stability measurements in all stability classes: 3 49 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 1 0 0 0 2 NNE 0 1 4 0 0 0 5 NE 1 3 7 0 0 0 11 ENE 2 4 1 0 0 0 7 E 0 2 5 1 0 0 8 ESE 0 1 4 2 0 0 7 SE 0 3 4 4 0 0 11 SSE 0 2 3 1 0 0 6 s 1 1 2 0 0 0 4 SSW 0 1 5 0 0 0 6 SW 0 2 5 3 4 0 14 WSW 0 1 0 0 1 0 2 w 0 0 2 5 0 0 7 WNW 0 2 13 2 0 0 17 NW 1 1 11 2 0 0 15 NNW 3 3 8 4 0 0 18 Variable 0 0 0 0 0 0 0 Total 8 28 75 24 5 0 140 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 50 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: January - March 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 2 0 0 0 2 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 1 0 1 0 0 2 SE 0 0 0 1 0 0 1 SSE 0 0 0 0 0 0 0 s 2 0 0 0 0 0 2 SSW 1 1 0 0 0 0 2 SW 2 1 1 0 0 0 4 WSW 0 0 1 0 0 0 1 w 0 0 2 0 0 0 2 WNW 0 0 2 2 0 0 4 NW 0 2 2 0 0 0 4 NNW 0 0 2 2 0 0 4 Variable 0 0 0 0 0 0 0 Total 5 5 13 6 0 0 29 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 51 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 20 1 0 0 23 NNE 0 5 2 1 0 0 8 NE 0 4 8 0 0 0 12 ENE 0 2 3 0 0 0 5 E 0 2 1 0 0 0 3 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 1 0 2 s 0 0 10 2 1 0 13 SSW 0 1 5 5 3 0 14 SW 0 1 4 7 1 0 13 WSW 0 2 7 9 0 0 18 w 0 1 11 7 0 0 19 WNW 0 3 19 6 0 0 28 NW 0 2 6 0 0 0 8 NNW 0 2 11 0 0 0 13 Variable 0 0 0 0 0 0 0 Total 0 27 108 38 6 0 17 9 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 52 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 5 1 0 0 10 NNE 0 4 2 0 0 0 6 NE 0 6 2 1 0 0 9 ENE 0 4 1 0 0 0 5 E 0 2 0 0 0 0 2 ESE 0 2 0 0 0 0 2 SE 0 1 1 0 0 0 2 SSE 0 4 0 1 0 0 5 s 1 5 1 4 0 0 11 SSW 0 1 5 3 2 0 11 SW 0 4 7 B 1 0 20 WSW 0 4 2 2 0 0 8 w 0 1 4 1 0 0 6 WNW 0 1 5 1 0 0 7 NW 0 10 4 0 0 0 14 NNW 0 6 3 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 59 42 22 3 0 127 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 53 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 9 4 2 0 0 15 NNE 0 6 1 0 0 0 7 NE 0 8 3 1 0 0 12 ENE 0 6 6 0 0 0 12 E 2 2 1 0 0 0 5 ESE 0 1 0 0 0 0 1 SE 2 4 0 0 0 0 6 SSE 1 4 2 1 0 0 8 s 0 4 4 5 1 0 14 SSW 0 10 4 8 2 0 24 SW 0 4 13 6 1 0 24 WSW 0 2 7 1 0 0 10 w 0 7 5 0 0 0 12 WNW 0 8 8 1 0 0 17 NW 0 7 3 0 0 0 10 NNW 0 4 4 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 5 86 65 25 4 0 185 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 54 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 15 5 0 0 0 25 NNE 5 12 18 1 0 0 36 NE 6 32 21 6 0 0 65 ENE 8 39 25 1 0 0 73 E 13 22 2 0 0 0 37 ESE 10 20 0 0 0 0 30 SE 9 21 8 0 0 0 38 SSE 3 28 26 0 0 0 57 s 1 26 60 18 2 0 107 SSW 4 14 31 25 7 0 81 SW 2 13 56 20 1 0 92 WSW 4 13 13 3 2 0 35 w 4 17 13 3 0 0 37 WNW 5 21 23 2 0 0 51 NW 6 12 9 0 0 0 27 NNW 3 12 23 0 0 0 38 Variable 0 0 0 0 0 0 0 Total 88 317 333 79 12 0 829 Hours of calm in this stability class: 5 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 55 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 7 0 0 0 0 13 NNE 9 10 0 0 0 0 19 NE 5 11 1 0 0 0 17 ENE 19 5 0 0 0 0 24 E 31 11 0 0 0 0 42 ESE 15 19 2 0 0 0 36 SE 8 28 5 0 0 0 41 SSE 10 31 12 0 0 0 53 s 6 25 49 5 0 0 85 SSW 1 18 26 15 0 0 60 SW 4 18 38 0 0 0 60 WSW 4 22 4 0 0 0 30 w 4 28 6 0 0 0 38 WNW 12 10 0 1 0 0 23 NW 3 8 1 0 0 0 12 NNW 7 12 3 0 0 0 22 Variable 0 0 0 0 0 0 0 Total 144 263 147 21 0 0 575 Hours of calm in this stability class: 2 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 56 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 7 1 0 0 0 0 8 NNE 4 2 0 0 0 0 6 NE 6 0 0 0 0 0 6 ENE 19 1 0 0 0 0 20 E 25 2 0 0 0 0 27 ESE 13 3 0 0 0 0 16 SE 3 1 0 0 0 0 4 SSE 0 1 0 0 0 0 1 s 5 1 0 0 0 0 6 SSW 0 4 4 0 0 0 8 SW 1 5 1 0 0 0 7 WSW 10 10 0 0 0 0 20 w 10 7 0 0 0 0 17 WNW 14 2 0 0 0 0 16 NW 5 1 0 0 0 0 6 NNW 5 0 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 127 41 5 0 0 0 173 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 57 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 0 0 0 0 0 3 NNE 4 0 0 0 0 0 4 NE 7 0 0 0 0 0 7 ENE 14 0 0 0 0 0 14 E 15 0 0 0 0 0 15 ESE 5 0 0 0 0 0 5 SE 3 0 0 0 0 0 3 SSE 1 0 0 0 0 0 1 s 1 0 0 0 0 0 1 SSW 1 1 0 0 0 0 2 SW 3 0 0 0 0 0 3 WSW 2 2 0 0 0 0 4 w 5 1 0 0 0 0 6 WNW 12 1 0 0 0 0 13 NW 8 0 0 0 0 0 8 NNW 8 0 0 0 0 0 8 Variable 0 0 0 0 0 0 0 Total 92 5 0 0 0 0 97 Hours of calm in this stability class: 9 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 58 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 6 17 1 0 24 NNE 0 2 8 0 1 0 11 NE 0 0 6 4 0 0 10 ENE 0 0 3 0 0 0 3 E 0 1 2 1 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 1 2 s 0 0 5 6 2 1 14 SSW 0 1 2 3 4 3 13 SW 0 0 1 7 4 1 13 WSW 0 0 2 9 5 0 16 w 0 0 5 8 5 0 18 WNW 0 1 6 16 7 0 30 NW 0 0 3 5 1 0 9 NNW 0 1 3 8 0 0 12 Variable 0 0 0 0 0 0 0 Total 0 6 53 84 30 6 17 9 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 59 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 4 3 1 0 10 NNE 0 1 6 0 0 0 7 NE 0 1 3 2 1 0 7 ENE 0 6 0 1 0 0 7 E 0 1 1 0 0 0 2 ESE 0 0 1 0 0 0 1 SE 0 0 1 0 0 0 1 SSE 1 5 1 1 0 0 8 s 0 1 4 0 3 1 9 SSW 0 1 1 3 3 2 10 SW 0 2 6 7 5 1 21 WSW 0 0 3 2 1 0 6 w 0 2 3 3 0 0 8 WNW 0 1 2 3 1 0 7 NW 0 6 3 5 0 0 14 NNW 0 4 3 2 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 33 42 32 15 4 127 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 60 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 3 3 1 0 14 NNE 0 7 1 1 0 0 9 NE 0 3 3 2 1 0 9 ENE 0 4 2 6 0 0 12 E 0 4 1 1 0 0 6 ESE 1 1 0 0 0 0 2 SE 2 1 2 0 0 0 5 SSE 0 6 0 2 1 0 9 s 0 6 1 5 3 1 16 SSW 0 4 5 3 8 3 23 SW 0 2 6 9 5 1 23 WSW 0 0 2 6 1 0 9 w 0 5 3 2 0 0 10 WNW 0 4 7 7 1 0 19 NW 0 6 1 3 0 0 10 NNW 0 3 2 3 1 0 9 Variable 0 0 0 0 0 0 0 Total 3 63 39 53 22 5 185 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 61 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 10 5 6 0 0 22 NNE 0 12 9 12 3 0 36 NE 2 10 25 17 9 0 63 ENE 1 19 32 16 2 0 70 E 5 10 18 7 0 0 40 ESE 6 7 8 11 0 0 32 SE 4 9 11 12 0 0 36 SSE 1 9 15 26 0 0 51 s 1 13 21 54 17 3 109 SSW 2 10 14 44 27 9 106 SW 2 9 25 37 10 1 84 WSW 3 5 15 7 2 2 34 w 1 9 12 8 2 0 32 WNW 1 8 18 22 3 0 52 NW 2 4 8 12 2 0 28 NNW 1 7 13 16 2 0 39 Variable 0 0 0 0 0 0 0 Total 33 151 249 307 79 15 834 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 62 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 10 0 0 0 13 NNE 0 2 11 0 0 0 13 NE 0 7 10 4 0 0 21 ENE 1 12 7 0 0 0 20 E 1 7 19 0 0 0 27 ESE 1 10 10 9 0 0 30 SE 0 11 23 12 0 0 46 SSE 0 8 12 21 1 0 42 s 2 11 33 43 10 0 99 SSW 1 5 17 55 18 2 98 SW 0 4 14 24 1 0 43 WSW 0 5 9 15 0 0 29 w 0 2 21 10 0 0 33 WNW 0 1 13 3 1 0 18 NW 1 5 12 3 0 0 21 NNW 0 5 14 5 0 0 24 Variable 0 0 0 0 0 0 0 Total 7 98 235 204 31 2 577 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 63 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 l 3 0 0 0 4 NNE l 5 3 3 0 0 12 NE 0 3 4 0 0 0 7 ENE 0 6 0 0 0 0 6 E 2 l 14 0 0 0 17 ESE l 3 10 2 0 0 16 SE l 9 l l 0 0 12 SSE 4 5 3 0 0 0 12 s 2 2 4 0 0 0 8 SSW 0 5 3 2 0 0 10 SW 0 2 2 5 0 0 9 WSW l 4 6 6 0 0 17 w l 4 5 6 0 0 16 WNW 0 6 5 0 0 0 11 NW 0 2 5 2 0 0 9 NNW 2 3 5 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 15 61 73 27 0 0 17 6 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 64 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: April - June 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 3 0 0 0 6 NNE 0 4 8 0 0 0 12 NE 1 3 2 0 0 0 6 ENE 0 1 1 0 0 0 2 E 0 3 0 0 0 0 3 ESE 0 4 5 0 0 0 9 SE 0 1 5 0 0 0 6 SSE 0 4 3 0 0 0 7 s 0 4 0 0 0 0 4 SSW 1 6 1 0 0 0 8 SW 4 1 3 0 0 0 8 WSW 1 2 2 2 0 0 7 w 0 6 3 2 0 0 11 WNW 1 4 2 0 0 0 7 NW 0 5 3 0 0 0 8 NNW 0 1 1 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 8 52 42 4 0 0 106 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 65 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 l 2 0 0 0 3 NNE 0 2 2 0 0 0 4 NE 0 3 3 0 0 0 6 ENE 0 8 0 0 0 0 8 E 0 6 0 0 0 0 6 ESE 0 4 0 0 0 0 4 SE 0 3 0 0 0 0 3 SSE 0 3 l 0 0 0 4 s 0 0 10 l 0 0 11 SSW 0 2 16 3 0 0 21 SW 0 0 11 2 2 0 15 WSW 0 l 10 3 0 0 14 w 0 6 2 0 0 0 8 WNW 0 4 l 0 0 0 5 NW 0 l 5 0 0 0 6 NNW 0 0 l 0 0 0 l Variable 0 0 0 0 0 0 0 Total 0 44 64 9 2 0 119 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 66 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 1 0 0 0 7 NNE 0 5 2 0 0 0 7 NE 2 7 5 0 0 0 14 ENE 0 4 0 0 0 0 4 E 0 14 0 0 0 0 14 ESE 0 7 0 0 0 0 7 SE 1 3 0 0 0 0 4 SSE 0 4 2 0 0 0 6 s 0 4 7 0 0 0 11 SSW 0 12 12 6 0 0 30 SW 0 3 13 7 0 0 23 WSW 0 9 9 3 0 0 21 w 0 11 6 3 0 0 20 WNW 0 7 8 0 0 0 15 NW 0 9 3 0 0 0 12 NNW 0 5 2 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 3 110 70 19 0 0 202 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 67 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 5 1 0 0 0 7 NNE 0 8 0 0 0 0 8 NE 1 10 2 0 0 0 13 ENE 3 11 2 0 0 0 16 E 3 6 0 0 0 0 9 ESE 7 5 0 0 0 0 12 SE 0 5 1 0 0 0 6 SSE 0 4 1 0 0 0 5 s 2 6 1 1 0 0 10 SSW 0 6 5 2 0 0 13 SW 0 8 20 8 0 0 36 WSW 0 4 9 1 0 0 14 w 0 9 6 1 0 0 16 WNW 0 8 6 0 0 0 14 NW 2 6 0 0 0 0 8 NNW 2 7 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 21 108 54 13 0 0 196 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 68 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4--:7 8-12 13-18 19-24 > 24 Total N 6 14 13 3 0 0 36 NNE 3 32 4 0 0 0 39 NE 11 59 21 0 0 0 91 ENE 15 61 2 0 0 0 78 E 14 9 0 0 0 0 23 ESE 3 8 0 0 0 0 11 SE 3 19 1 0 0 0 23 SSE 1 28 10 0 0 0 39 s 1 11 39 5 1 0 57 SSW 0 5 38 38 1 0 82 SW 0 18 60 10 0 0 88 WSW 9 11 11 2 0 0 33 w 1 14 9 2 0 0 26 WNW 5 18 8 1 0 0 32 NW 10 8 4 0 0 0 22 NNW 9 24 4 0 0 0 37 Variable 0 0 0 0 0 0 0 Total 91 339 224 61 2 0 717 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 69 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 17 2 0 0 0 27 NNE 12 27 1 0 0 0 40 NE 10 17 1 0 0 0 28 ENE 38 20 0 0 0 0 58 E 46 4 0 0 0 0 50 ESE 20 11 0 0 0 0 31 SE 7 17 1 0 0 0 25 SSE 6 44 3 0 0 0 53 s 3 32 42 3 0 0 80 SSW 1 13 16 1 0 0 31 SW 2 30 37 2 0 0 71 WSW 5 32 5 2 0 0 44 w 12 20 1 1 0 0 34 WNW 13 7 0 0 0 0 20 NW 15 8 2 0 0 0 25 NNW 8 7 1 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 206 306 112 9 0 0 633 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 70 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 0 0 0 0 0 6 NNE 5 2 0 0 0 0 7 NE 12 0 0 0 0 0 12 ENE 22 2 0 0 0 0 24 E 48 1 0 0 0 0 49 ESE 16 9 0 0 0 0 25 SE 2 2 0 0 0 0 4 SSE 1 4 0 0 0 0 5 s 1 0 0 0 0 0 1 SSW 4 4 3 0 0 0 11 SW 3 6 3 0 0 0 12 WSW 5 8 0 0 0 0 13 w 25 4 0 0 0 0 29 WNW 20 2 0 0 0 0 22 NW 7 0 0 0 0 0 7 NNW 9 0 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 186 44 6 0 0 0 236 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 71 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 0 0 0 0 0 3 NNE 7 0 0 0 0 0 7 NE 5 0 0 0 0 0 5 ENE 8 0 0 0 0 0 8 E 6 1 0 0 0 0 7 ESE 0 2 0 0 0 0 2 SE 2 0 0 0 0 0 2 SSE 1 0 0 0 0 0 1 s 1 0 1 0 0 0 2 SSW 0 0 0 0 0 0 0 SW 1 0 0 0 0 0 1 WSW 7 6 0 0 0 0 13 w 19 0 0 0 0 0 19 WNW 14 0 0 0 0 0 14 NW 10 0 0 0 0 0 10 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 88 9 1 0 0 0 98 Hours of calm in this stability class: 7 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 72 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 0 0 0 3 NNE 0 0 3 1 0 0 4 NE 0 0 4 2 0 0 6 ENE 0 2 1 0 0 0 3 E 0 4 7 0 0 0 11 ESE 0 1 3 0 0 0 4 SE 0 3 0 0 0 0 3 SSE 0 0 4 0 0 0 4 s 0 0 7 5 1 0 13 SSW 0 0 7 11 2 2 22 SW 0 0 7 4 1 0 12 WSW 0 0 7 5 1 0 13 w 0 5 1 3 0 0 9 WNW 0 0 3 0 0 0 3 NW 0 0 5 1 2 0 8 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 15 62 33 7 2 119 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 73 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 3 0 0 0 7 NNE 0 2 5 2 0 0 9 NE 0 4 5 3 0 0 12 ENE 0 4 2 0 0 0 6 E 0 8 2 0 0 0 10 ESE 0 5 3 0 0 0 8 SE 1 2 0 0 0 0 3 SSE 0 1 7 1 0 0 9 s 0 5 3 4 0 0 12 SSW 0 3 13 10 3 0 29 SW 0 1 7 8 5 0 21 WSW 0 1 16 4 2 0 23 w 0 7 6 5 0 0 18 WNW 0 4 7 2 2 0 15 NW 0 4 4 4 0 0 12 NNW 0 4 3 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 1 59 86 44 12 0 202 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 74 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 2 0 0 0 4 NNE 1 8 1 0 0 0 10 NE 1 5 6 2 0 0 14 ENE 0 12 3 1 0 0 16 E 1 6 1 0 0 0 8 ESE 1 8 3 0 0 0 12 SE 1 5 1 0 0 0 7 SSE 0 1 4 0 0 0 5 s 2 3 1 1 1 0 8 SSW 0 6 4 3 1 2 16 SW 0 7 19 9 4 0 39 WSW 0 2 4 5 1 0 12 w 0 3 9 1 1 0 14 WNW 0 6 5 2 1 0 14 NW 0 6 2 0 0 0 8 NNW 1 6 2 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 8 86 67 24 9 2 196 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 75 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 12 8 9 4 0 36 NNE 3 11 15 2 0 0 31 NE 6 16 41 22 0 0 85 ENE 11 25 39 2 0 0 77 E 2 20 11 0 0 0 33 ESE 2 5 6 0 0 0 13 SE 1 7 7 1 0 0 16 SSE 1 5 25 7 0 0 38 s 0 7 20 25 3 0 55 SSW 2 2 19 51 35 3 112 SW 0 2 34 34 2 0 72 WSW 1 7 10 8 1 0 27 w 0 11 11 6 2 0 30 WNW 3 6 8 6 1 1 25 NW 4 6 6 6 0 0 22 NNW 3 17 17 8 0 0 45 Variable 0 0 0 0 0 0 0 Total 42 159 277 187 48 4 717 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 76 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 4 13 6 0 0 24 NNE 1 4 30 3 0 0 38 NE 0 5 18 4 0 0 27 ENE 1 21 27 0 0 0 49 E 0 15 40 0 0 0 55 ESE 1 11 12 1 0 0 25 SE 0 7 18 0 1 0 26 SSE 0 8 25 6 0 0 39 s 1 5 39 35 9 0 89 SSW 1 5 18 28 3 0 55 SW 0 6 29 33 2 0 70 WSW 1 3 27 4 2 0 37 w 1 2 24 7 2 0 36 WNW 1 6 7 1 0 0 15 NW 0 7 10 4 0 0 21 NNW 0 9 12 6 0 0 27 Variable 0 0 0 0 0 0 0 Total 9 118 349 138 19 0 633 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 77 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 10 0 0 0 16 NNE 0 0 8 0 0 0 8 NE 1 0 2 1 0 0 4 ENE 0 5 8 0 0 0 13 E 0 4 19 9 0 0 32 ESE 0 2 19 9 0 0 30 SE 1 6 9 6 0 0 22 SSE 0 4 2 1 0 0 7 s 0 3 2 0 0 0 5 SSW 1 2 3 0 0 0 6 SW 0 1 6 9 0 0 16 WSW 0 4 5 2 0 0 11 w 0 3 19 0 0 0 22 WNW 0 1 11 1 0 0 13 NW 3 3 13 1 0 0 20 NNW 0 2 9 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 6 46 145 39 0 0 236 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 78 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: July - September 2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 3 10 0 0 0 15 NNE 0 0 2 2 0 0 4 NE 0 0 0 0 0 0 0 ENE 1 0 1 0 0 0 2 E 0 2 1 1 0 0 4 ESE 0 1 3 0 0 0 4 SE 1 0 1 0 0 0 2 SSE 0 0 2 1 0 0 3 s 1 1 0 1 0 0 3 SSW 0 7 0 0 0 0 7 SW 1 6 0 0 0 0 7 WSW 1 5 3 2 0 0 11 w 0 4 1 4 0 0 9 WNW 0 5 7 2 0 0 14 NW 0 7 8 0 0 0 15 NNW 0 2 3 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 7 43 42 13 0 0 105 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 79 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 1 0 1 WNW 0 0 1 0 0 0 1 NW 0 2 1 0 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 2 2 0 1 0 5 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 80 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 2 1 0 0 0 3 SE 0 1 0 0 0 0 1 SSE 0 1 0 0 0 0 1 s 0 0 1 0 0 0 1 SSW 0 0 2 0 0 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 3 1 2 0 6 WNW 0 1 10 0 2 0 13 NW 0 1 0 2 0 0 3 NNW 0 1 0 1 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 7 17 4 4 0 32 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 81 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 1 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 1 0 0 0 0 1 E 0 5 0 0 0 0 5 ESE 0 1 2 0 0 0 3 SE 0 5 3 0 0 0 B SSE 0 4 0 0 0 0 4 s 0 1 6 0 0 0 7 SSW 0 3 9 2 0 0 14 SW 0 0 7 1 0 0 8 WSW 0 0 1 0 0 0 1 w 0 0 10 2 2 0 14 WNW 0 4 11 4 2 0 21 NW 0 4 2 0 0 0 6 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 30 53 9 4 0 96 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 82 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 14 22 1 0 0 41 NNE 5 44 11 4 0 0 64 NE 10 28 11 0 0 0 49 ENE 7 68 13 1 0 0 89 E 11 36 4 0 0 0 51 ESE 3 19 8 2 0 0 32 SE 1 23 23 2 0 0 49 SSE 0 29 47 8 0 0 84 s 0 14 59 59 13 2 147 SSW 2 11 27 43 6 2 91 SW 1 24 38 19 0 0 82 WSW 2 16 21 20 1 3 63 w 2 21 29 25 2 2 81 WNW 4 30 34 25 8 0 101 NW 10 23 31 0 0 0 64 NNW 4 23 11 0 0 0 38 Variable 0 0 0 0 0 0 0 Total 66 423 389 209 30 9 1126 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 83 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 5 15 1 0 0 0 21 NNE 3 11 0 0 0 0 14 NE 3 7 0 0 0 0 10 ENE 12 10 0 0 0 0 22 E 29 10 0 0 0 0 39 ESE 10 20 3 0 0 0 33 SE 5 30 14 0 0 0 49 SSE 3 21 12 0 0 0 36 s 6 41 53 2 0 0 102 SSW 1 13 26 17 1 0 58 SW 1 15 21 6 0 0 43 WSW 6 22 20 0 0 0 48 w 11 42 15 1 0 0 69 WNW 7 41 12 3 0 0 63 NW 7 19 3 0 0 0 29 NNW 11 9 3 0 0 0 23 Variable 0 0 0 0 0 0 0 Total 120 326 183 29 1 0 659 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 84 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 0 0 0 0 0 3 NNE 4 0 0 0 0 0 4 NE 5 0 0 0 0 0 5 ENE 8 0 0 0 0 0 8 E 19 0 0 0 0 0 19 ESE 10 8 0 0 0 0 18 SE 8 2 0 0 0 0 10 SSE 6 4 0 0 0 0 10 s 3 0 0 0 0 0 3 SSW 2 5 3 0 0 0 10 SW 7 2 1 0 0 0 10 WSW 8 13 1 0 0 0 22 w 25 20 0 0 0 0 45 WNW 20 7 0 0 0 0 27 NW 6 0 0 0 0 0 6 NNW 2 0 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 136 61 5 0 0 0 202 Hours of calm in this stability class: 1 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 85 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 34 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 0 0 0 0 1 NNE 2 0 0 0 0 0 2 NE 6 0 0 0 0 0 6 ENE 9 0 0 0 0 0 9 E 12 1 0 0 0 0 13 ESE 7 3 0 0 0 0 10 SE 4 1 0 0 0 0 5 SSE 0 0 0 0 0 0 0 s 2 0 0 0 0 0 2 SSW 3 0 0 0 0 0 3 SW 3 0 0 0 0 0 3 WSW 3 0 0 0 0 0 3 w 11 2 0 0 0 0 13 WNW 8 0 0 0 0 0 8 NW 2 0 0 0 0 0 2 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 77 7 0 0 0 0 84 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 86 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Extremely Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 1 1 WNW 0 0 1 0 0 0 1 NW 0 1 2 0 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 3 0 0 1 5 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 87 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Moderately Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 3 1 0 0 4 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 0 1 s 0 0 1 0 0 0 1 SSW 0 0 1 1 0 0 2 SW 0 0 0 0 0 0 0 WSW 0 0 1 0 0 0 1 w 0 0 1 0 0 3 4 WNW 0 0 1 8 1 2 12 NW 0 0 3 0 2 0 5 NNW 0 1 0 0 1 0 2 Variable 0 0 0 0 0 0 0 Total 0 1 12 10 4 5 32 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 88 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Slightly Unstable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 2 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 3 0 0 0 6 ESE 0 0 1 2 0 0 3 SE 0 2 6 1 0 0 9 SSE 0 2 1 0 0 0 3 s 0 2 3 4 0 0 9 SSW 0 1 5 5 1 0 12 SW 0 0 4 4 0 0 8 WSW 0 0 1 1 0 0 2 w 0 0 4 4 2 2 12 WNW 0 0 8 6 4 4 22 NW 0 0 4 1 1 0 6 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 11 43 28 8 6 96 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 89 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Neutral - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 12 17 16 3 0 49 NNE 0 14 30 8 4 1 57 NE 3 10 26 7 1 0 47 ENE 2 17 36 9 1 0 65 E 3 9 40 14 5 0 71 ESE 1 7 13 10 7 1 39 SE 1 8 16 10 5 1 41 SSE 0 6 35 34 11 0 86 s 0 6 21 55 49 18 14 9 SSW 2 4 15 41 39 10 111 SW 1 18 25 22 7 1 74 WSW 0 7 13 21 15 5 61 w 1 8 10 20 22 7 68 WNW 0 8 23 29 19 16 95 NW 2 14 15 24 19 0 74 NNW 0 19 10 10 0 0 39 Variable 0 0 0 0 0 0 0 Total 17 167 345 330 207 60 1126 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 90 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Slightly Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 19 4 0 0 29 NNE 0 1 8 2 0 0 11 NE 1 1 9 0 0 0 11 ENE 0 4 8 0 0 0 12 E 0 8 19 11 0 0 38 ESE 0 5 7 11 0 0 23 SE 0 5 23 12 5 0 45 SSE 1 3 17 13 5 0 39 s 0 8 30 45 6 0 89 SSW 0 4 25 47 15 3 94 SW 0 7 12 17 8 1 45 WSW 0 3 13 17 3 0 36 w 0 4 24 15 4 0 47 WNW 0 4 34 37 2 1 78 NW 0 3 13 21 2 1 40 NNW 0 6 9 7 0 0 22 Variable 0 0 0 0 0 0 0 Total 2 72 270 259 50 6 659 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 91 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Moderately Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 4 0 0 0 7 NNE 0 1 3 0 0 0 4 NE 1 2 3 0 0 0 6 ENE 0 1 1 0 0 0 2 E 0 1 3 1 0 0 5 ESE 0 2 6 9 0 0 17 SE 1 5 12 1 0 0 19 SSE 0 2 1 0 0 0 3 s 0 8 6 0 0 0 14 SSW 0 4 7 0 0 0 11 SW 0 5 3 4 1 0 13 WSW 0 1 4 1 0 0 6 w 1 1 11 14 0 0 27 WNW 0 2 23 14 0 0 39 NW 1 2 13 3 0 0 19 NNW 0 6 5 0 0 0 11 Variable 0 0 0 0 0 0 0 Total 5 45 105 47 1 0 203 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 92 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

Braidwood Generating Station Period of Record: October - December2021 Stability Class - Extremely Stable - 199Ft-30Ft Delta-T (F)

Winds Measured at 203 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 3 0 0 0 7 NNE 1 1 1 0 0 0 3 NE 0 3 0 0 0 0 3 ENE 0 4 3 0 0 0 7 E 0 2 1 4 0 0 7 ESE 0 2 0 0 0 0 2 SE 0 1 4 2 0 0 7 SSE 1 1 4 0 0 0 6 s 0 7 0 0 0 0 7 SSW 0 5 1 0 0 0 6 SW 0 4 2 0 0 0 6 WSW 2 3 4 0 0 0 9 w 1 0 3 2 0 0 6 WNW 0 0 5 0 0 0 5 NW 0 0 0 0 0 0 0 NNW 1 4 1 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 6 41 32 8 0 0 87 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 93 of 94

BRAIDWOOD NUCLEAR POWER STATION RADIOACTIVE EFFLUENT RELEASE REPORT FOR 2021 UNIT 1, UNIT 2 and ISFSI (Docket Numbers 50-456, 50-457 and 72-73)

APPENDIX D: ERRATA There were two errors identified in 2021 .

a. An enhancement was identified in the 2020 ARERR Summary Table for 1-131. The 2020 ARERR Summary Table for 1-131 included all Iodines and Halogens instead of only 1-131. This is changed in the 2021 ARE RR so that only the 1-131 is included in the Summary Table. This is aligned with the Regulatory Guide 1.21 Revision 1 that our ODCM is committed to. The correction for 2020 Summary Table is listed below.

Est. Total Unit 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Error3/4 Iodine 131 Releases

14. Total lodine-131 Ci <LLD j 1.897-07I 1.723E-06 j4.771E-06 I 6.68E-06 I 3.32E+01

b. An error was identified in the 2020 AR ERR Summary Table for liquid tritium releases. There was a transcription error in Quarter 2 and Quarter 4. The correct values are listed in the table below.

Est. Total Unit 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Error%

Tritium j4. Total Release Ci 15.302E+o2 j 9.636E+o2 j 1.612E+02 j 2.555E+o2 j 1.91 0E+03 I 5.85E+00 94 of 94

BW220026, Annual Radioactive Effluent Release Report (ARERR)

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SUMMARY

SUMMARY

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