ML23122A065

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Annual Radioactive Effluent Release Report
ML23122A065
Person / Time
Site: Clinton Constellation icon.png
Issue date: 12/31/2022
From: Johnston R
Constellation Energy Generation
To:
Office of Nuclear Reactor Regulation
References
U-604760
Download: ML23122A065 (1)
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Text

,: -Y Constellation~

January 01, 2022 - December 31,-2022 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT CLINTON POWER STATION- DOCKET NUMBER 50-461 Prepared by:

  • Rachel Johnston Clinton Power Station Page 1 of 112

TABLE OF CONTENTS SECTION# TITLE PAGE 1 Executive Summary 6 2 Introduction 7 3 Supplemental Information 13 4 Radioactive Effluent Data 17 5 Solid Waste Disposal Information 28 6 Dose Measurements and Assessments 31 7 Meteorological Data and Dispersion Estimates 43 8 ODCM Operational Remedial Requirement Report 102 9 Changes to Radioactive Waste Treatment Systems 103 10 New Locations for Dose Calculation and/or Environmental Monitoring 104 11 Corrections to Data Reported in Previous Reports 107 12 Changes to the Offsite Dose Calculation Manual 112 Page 2 of 112

LIST OF TABLES TABLE# TITLE PAGE Gaseous Effluents - Summation of All Releases 17 1

  • lA Air Doses Due to Gaseous Releases 18
  • lB Doses to a Member of the Public Due to Radioiodines, Tritium, 18 Carbon-14, and Particulates in Gaseous Releases 2 Gaseous Effluents - Nuclides Released 19 3 Radioactive Gaseous Waste LLD Values 20 4 Waterborne Effluents - Summation of All Releases 22 5 Waterborne Effluents - Nuclides Released 23 6 Radioactive Liquid Waste LLD Values 24 7 Solid Waste and Irradiated Fuel Shipments 29 Maximum Offsite Doses and Dose Commitments to Members of the Public 8 32 in Each Sector Calculated Doses to Members of the Public During Use of the Department 9 of Natural Resources Recreation Area in the East-Southeast Sector within 36 the CPS Site Boundary Calculated Doses to Members of the Public During Use of the Road in the 10 37 Southeast Sector within the CPS Site Boundary Calculated Doses for the Residents in the South-Southeast Sector within 11 38 the CPS Site Boundary Calculated Doses for the Residents in the Southwest Sector within the CPS 12 39 Site Boundary Calculated Doses to Members of the Public During Use of the Agricultural 13 40 Acreage in the South-Southwest Sector within the CPS Site Boundary Calculated Doses for the Residents in the West-Southwest Sector within 14 41 the CPS Site Boundary Calculated Doses to Members of the Public During Use of Clinton Lake in 15 42 the Northwest Sector within the CPS Site Boundary 16 Meteorological Data Availability 44 17 Classification of Atmospheric Stability 45 18 Joint Wind Frequency Distribution by Stability Class 46 Page 3 of 112

19 Nearest Residence 104 20 Nearest Broadleaf Garden 105 21 Nearest Milking Animal 106 Page 4 of 112

LIST OF FIGURES FIGURE# TITLE PAGE 1 CPS Airborne Effluent Release Points 8 2 CPS Waterborne Effluents Release Pathway 9 3 Effluent Exposure Pathways 11 4 Areas Within the CPS Site Boundary Open to Members of the Public 35 Page 5 of 112

SECTION l EXECUTIVE

SUMMARY

The Annual Radioactive Effluent Release Report (ARERR) is a detailed description of gaseous and liquid radioactive effluents released from Clinton Power Station (CPS) and the resulting radiation doses for the period of January 01, 2022 through December 31, 2022. This report also includes a detailed meteorological section providing weather history of the surrounding area during this period. The information in the ARERR is used to calculate the offsite dose to our public.

The report also includes a summary of the amounts of radioactive material contained in solid waste that is packaged and shipped to a federally approved disposal/burial facility offsite.

Additionally, this report notifies the U.S. Nuclear Regulatory Commission (NRC} staff of changes to CPS's Offsite Dose Calculation Manual (ODCM), as well as exceptions to the CPS effluent monitoring program and a summary of events that must be reported in accordance with ODCM Section 6.2.

The NRC requires that nuclear power facilities be designed, constructed and operated in such a manner as to maintain radioactive effluent releases to unrestricted areas f!is !:_ow f!is.

Reasonably Achievable (ALARA). To ensure compliance with this criterion, the NRC has established limitations governing the release of radioactivity in effluents.

During 2022, CPS operations were well within these federally required limits. The maximum annual radiation dose delivered to the inhabitants of the area surrounding CPS, due to radioactivity released from the station, was 3.llE-01 mRem (millirem). The radiation dose to the public in the vicinity of CPS was calculated by using the concentration of radioactive nuclides from each gaseous effluent release coupled with historical weather conditions. The dose from CPS gaseous radioactive effluents is only a small fraction of the limit (2.07E+00%) for the maximum exposed member of the public. There were no liquid effluent releases in 2022.

As such, there was no dose received by the public from the liquid radioactive effluent pathway.

Page 6 of 112

SECTION 2 INTRODUCTION CPS is located in Harp Township, DeWitt County approximately six miles east of the city of Clinton in east-central Illinois. CPS is a ~1,120 megawatt gross electrical power output boiling water reactor. Initial fuel load commenced in September of 1986 with initial criticality of the reactor occurring on February 27, 1987. Commercial operation commenced in April 1987 and the reactor reached 100% power for the first time on September 15, 1987.

CPS releases airborne effluents via two gaseous efflu*ent release points to the environment. They are the Common Station Heating, Ventilating, and Air Conditioning (HVAC)

Vent Stack and the Standby Gas Treatment System (SGTS) Vent as shown in Figure 1. Each gaseous effluent release point is continuously monitored consisting of a surveillance program of periodic sampling and analysis as specified in the ODCM.

CPS is licensed to release radioactive liquid effluents in a batch mode, however there were no radioactive liquid releases in 2022 at CPS. Each release would have been sampled and analyzed prior to release if this were to occur. Depending upon the amount of activity in a release, liquid effluents would vary from 10 to 300 gallons per minute (GPM). This volume is further combined with both Plant Service Water flow, which is a minimum of approximately 5,000 GPM, along with Plant Circulating Water flow, another Oto 567,000 GPM, in the seal. well, just prior to entering the 3.4-mile discharge flume into Lake Clinton as depicted in Figure 2.

Processing and Monitoring CPS strictly controls effluents to ensure radioactivity released to the environment is maintained ALARA and does not exceed federal release limit criteria. Effluent controls include the operation of radiation monitoring systems within the plant as well as an offsite environmental analysis program. In-plant radiation monitoring systems are used to provide a continuous indication of radioactivity in effluent streams. Some are also used to collect particulate and radioiodine samples. Radioactive effluent related samples are analyzed in a controlled laboratory environment to identify the specific concentration of those radionuclides being released. Sampling and analysis provides a more sensitive and precise method of determining effluent composition to complement the information provided by real-time radiation monitoring instruments.

Beyond the plant itself, a Radiological Environmental Monitoring Program (REMP) is maintained in accordance with Federal Regulations. The purpose of the REMP program is to assess the radiological impact on the environment due to the operation of CPS. Implicit in this charter is the license requirement to trend and assess radiation exposure rates and radioactivity concentrations that may contribute to dose to the public. The program consists of two phases; pre-operational and operational. During the pre-operational phase of the program, the baseline for the local radiation environment was established. The operational phase of the program includes the objective of making confirmatory measurements to verify that the in-plant controls for the release of radioactive material are functioning as designed. Assessment of the operational impact of CPS on the environment is based on data collected since initial criticality of the reactor.

Page 7 of 112

FIGURE 1 CPS AIRBORNE EFFLUENT RELEASE POINTS TURBINE BULDING IWlWASTE ANO ROOF EL 876'0' MACHINE SHOP BUILDING ROOF EL 781'0' COKTROL ROOM AIRHANOUNG UNrTS CONTllNIIENT BUILDING FUB. BUl.DINQ ROOF EL 800'0' I SGll FUER UHITS

'---- ___ :::v (R' EL 710'0')

HVAC Exhaust Vent SGTS Exhaust Vent Release Point Height (feet) 200 200 190 190 Building Height (feet)

Release Point Geometry Duct Pipe Release Point Area (ft 2 ) 120 2 Release Point Diameter (feet) 12* 1 Annual Average Flow Rate (ft 3 /sec) 3,945 67 Vertical Exit Velocity (feet/sec) 33 41

  • Effective 2(A/rc) 1 ' 2 diameter Page 8 of 112

FIGURE 2 CPS WATERBORNE EFFLUENTS RELEASE PATHWAY PLANT SERVICE WATER RWBLOG.

(UP 10 25.000 l (AT LEAST 5000 GPMl GAW>NSIBATCH) 1-------:"7--

LIQUID RADWASTE DISCHARGE LINE I

(to-600Ra>-GO'.>GPMl

(@).RAOIATIONMONrrOR I.L.MMnRIP 8El'POIK1'CM.C.A.RED BASeO ON EIO{ekl'CHISOtOPlOIJWWIS mo DlWt10H ROW

~ lSOLATlON VALVE TERMINl.1l:S RELEASE ON HIGH M>W'IOH.

KGH RQ.EASE R/1NME, OR f.t1N El COMPOSltE SAMPLER OlUJTION MR RATE CClU.ECl'8 HIPROXllmBY 20 ml E.V'lllf( 00 MINUTES FROM THE OlSCtWlGE fWMEFORMONt'HLY >&IYSIS SEALWELL LAKE PLANT CIRCULATING ~ ~ - - - - - - -...... .__ _ _...__ _ _ ___ CLINTON WATER (0-567 .000 GPM) DISCHARGE FLUME 3.4 MILES Page 9 of 112

Exposure Pathways A radiological exposure pathway is the vehicle by which the public may become exposed to radioactivity released from nuclear facilities. The major pathways of concern are those that could cause the highest calculated radiation dose. These pathways are determined from the type and amount of radioactivity released, the. environmental transport mechanism and how the plant environs are used (i.e., residence, gardens, etc.). The environmental transport mechanism includes the historical meteorological characteristics of the area that are defined by wind speed and wind direction. This information is used to evaluate how the rad.ionuclides will be distributed within the surrounding area. The most important factor in evaluating the exposure pathway is the use of the environment by the public living around CPS. Factors such as location of homes in the area, use of cattle for milk and the growing of gardens for vegetable consumption are important considerations when evaluating exposure pathways. Figure 3 illustrates the effluent exposure pathways that were considered.

The radioactive gaseous effluent exposure pathways include direct radiation, deposition on plants and soil and inhalation by animals and humans. The radioactive liquid effluent exposure pathways include fish consumption and direct exposure from Clinton Lake.

Dose Assessment Whole body radiation involves the exposure of all organs in the human body to ionizing radiation. Most naturally occurring background radiation exposures consist of whole body exposure although specific organs can receive radiation exposure from distinct radionuclides.

These radionuclides enter the body through inhalation and ingestion and seek different organs depending on the nuclide. For example, radioactive iodine selectively concentrates in the thyroid, radioactive strontium in mineralized bone, and radioactive cesium collects in muscle and liver tissue.

The total dose to organs from a given radionuclide also depends on the amount of activity in the organ and the amount of time that the radionuclide remains in the body. Some radionuclides remain for very short periods of time due to their rapid radioactive decay and/or elimination rate from the body, while others may remain longer.

Radiation dose to the public in the area surrounding CPS is calculated for each release using historical weather conditions coupled with the concentrations of radioactive material present. The dose is calculated for all sixteen geographical sectors surrounding CPS and includes the location of the nearest residents, vegetable gardens producing broad leaf vegetables and dairy animals in all se*ctors. The calculated dose also uses the scientific concept of a "maximum exposed individual" and "standard man," and the maximum use factors for the environment, such as how much milk an average person consumes and how much air a person breathes in a year.

Section 6 contains more detailed information on dose to the public.

Page 10 of 112

FIGURE 3 EFFLUENT EXPOSURE PATHWAYS AIRBORNE ANIMALS RELEASES CLINTON POWER (MILK, MEAT)

~ STATION CONSUMED BY PEOPLE

~ PEOPLE t

CONSUMED BY ANIMALS

~SUMED BY PEOPLE RELEASES DILUTED BY LAKE

~

CONSUMED BY PEOPLE FISH

/

. r_, -

J I

Page 11 of 112

Gaseous Effluents Gaseous effluent radioactivity released from CPS is classified into two (2) categories.

The first category is noble gases. The second category consists of 1131, 1133, H3, C14 and all radionuclides in particulate form with radioactive half-lives greater than eight (8) days. Noble gases - such as xenon and krypton - are biologically and chemically non-reactive. As such, these radionuclides specifically Kr 85 m, Xe 133 and Xe 135 - are the major contributors to external doses.

113 1, 1133 , H3, C14 and radionuclides in particulate form with radioactive half-lives greater than eight (8) days are the major contributors to internal doses.

Liquid Effluents Liquid effluents may originate from two (2) sources at CPS. The first is effluent from the Radioactive Waste Treatment System. This water is demineralized prior to release, and samples are taken after the tank has been allowed to adequately recirculate. The second is from heat exchanger leaks found in closed cooling water systems that service radioactively contaminated systems. This second source would be considered an abnormal release if to occur. As a matter of station management commitment, CPS strives to be a zero {O) radioactive liquid release plant. The last radioactive liquid release occurred in September of 1992.

Solid Waste Shipments To reduce the radiation exposure to personnel and maintain the federally required ALARA concept, the NRC and the Department of Transportation (DOT) have established limits on the types of radioactive waste and the amount of radioactivity that may be packaged and shipped offsite for burial or disposal. To ensure that CPS is complying with these regulations, the types of waste and the radioactivity present are reported to the NRC.

Page 12 of 112

SECTION 3 SUPPLEMENTAL INFORMATION I. REGULATORY LIMITS The NRC requires nuclear power facilities to be designed, constructed and operated in such a way that the radioactivity in effluent releases to unrestricted areas is kept ALARA. To ensure these criteria are met, each license authorizing nuclear reactor operation includes the Offsite Dose Calculation Manual governing the release of radioactive effluents. The ODCM designates the limits for release of effluents, as well as the limits for doses to the genera I public from the release of radioactive liquids and gases. These limits are taken from Title 10 of the Code of Federal Regulations, Part 50, Appendix I (10CFRS0 Appendix I), Title 10 of the Code of Federal Regulations, Part 20.1301 (10CFR20.1301) and Section 5.5.4 of Clinton Station's Technical Specifications. Maintaining effluent releases within these operating limitations demonstrates compliance with ALARA principles.

Specific limit information is given below.

A. Gaseous Effluents

1. The maximum permissible concentrations to limit doses for gaseous effluents shall not exceed the values provided within Section 5.5.4.g of Station's Technical Specifications. To ensure these concentrations are not exceeded, dose rates due to radioactive materials released in gaseous effluents from the site to areas at and beyond the site area boundary shall be limited to the following:
a. Noble gases Less than or equal to 500 mRem/year to the total body.

Less than or equal to 3,000 mRem/year to the skin.

131 133

b. 1 , 1 , H3 , and all radionuclides in particulate form with radioactive half-lives greater than eight (8) days:

Less than or equal to 1,500 mRem/year to any organ.

2. In accordance with 10CFRS0 Appendix I, air dose due to noble gases released in gaseous effluents to areas at and beyond the site boundary shall be limited to the following:
a. Less than or equal to 5 mRad for gamma radiation and less than or equal to 10 mRad for beta radiation during any calendar quarter.
b. Less than or equal to 10 mRad for gamma radiation and less than or equal to 20 mRad for beta radiation during any calendar year.

Page 13 of 112

3. In accordance with 10CFR50 Appendix I, dose to a member of the public (from 1131 , 1133 , H3, and all radionuclides in particulate form with radioactive half-lives greater than eight (8) days) in gaseous effluents released to areas at and beyond the site boundary shall be limited to the following values:
a. Less than or equal to 7.5 mRem to any organ, during any calendar quarter.
b. Less than or equal to 15 mRem to any organ, during any calendar year.

B. Liquid Effluents

1. The concentration of radioactive material released in liquid effluents to unrestricted areas shall be limited to the values provided within Section 5.5.4.b of Station's Technical Specifications for radionuclides other than dissolved or entrained noble gases. For dissolved or entrained noble gases, the concentration shall be limited to 2.00E-04 µCi/ml total activity.
2. The dose or dose commitment to a member of the public from radioactive materials in liquid effluents released to unrestricted areas shall be limited to:
a. Less than or equal to 1.5 mRem to the total body and less than or equal to 5 mRem to any organ during any calendar quarter.
b. Less than or equal to 3 mRem to the total body and less than or equal to 10 mRem to any organ during any calendar year.

The above gaseous and liquid effluent limits are just a fraction of the dose limits established by the Environmental Protection Agency (EPA) found within Environmental Dose Standard Title 40, Code of Federal Regulations, Part 190 (40CFR190). The EPA has established dose limits for members of the public in the vicinity of a nuclear power plant. These dose limits are:

Less than or equal to 25 mRem per year to the total body.

Less than or equal to 75 mRem per year to the thyroid.

Less than or equal to 25 mRem per year to any other organ.

II. AVERAGE ENERGY The CPS ODCM limits the dose equivalent rates due to the release of fission and activation gases to less than or equal to 500 mRem per year to the total body and less than or equal to 3,000 mRem per year to the skin. These limits are based on dose calculations using actual isotopic concentrations from our effluent release streams and not based upon the gross count rate from our monitoring systems. Therefore, the average beta and gamma energies for gaseous effluents as described in Regulatory Guide 1.21, "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," are not applicable.

Page 14 of 112

Ill. MEASUREMENT AND APPROXIMATIONS OF TOTAL RADIOACTIVITY A. Fission and Activation Gases

1. Gas samples are collected weekly and are counted on a high purity germanium detector (HPGe) for principal gamma emitters. The HVAC and SGTS release points are continuously monitored and the average release flow rates for each release point are used to calculate the total activity released during a given time period.
2. Tritium is also collected by passing a known volume of the sample stream through a gas washer containing a known quantity of demineralized water. The collected samples are distilled and analyzed by liquid scintillation. The tritium released was calculated for each release point from the measured tritium concentration, the volume of the sample, the tritium collection efficiency, and the respective stack exhaust flow rates.
3. Carbon-14 release values were estimated using the methodology included in the EPRI Technical Report 1021106, using the 2022 Clinton Power Station specific parameters of normalized Carbon-14 production rate of 5.049 Ci/GWt-yr, a gaseous release fraction of 0.99, a Carbon-14 carbon dioxide fraction of 0.95, a reactor power rating of 3473 MWt, and equivalent full power operation of 356.8 days.

B. Iodines Iodine is continuously collected on a silver zeolite cartridge filter via an isokinetic sampling assembly from each release point. Filters are normally exchanged once per week and then analyzed on an HPGe system. The flow rates for each release point are averaged over the duration of the sampling period and these results - along with specific isotopic concentrations -

are then used to determine the total activity released during the time period in question.

C. Particulates Particulates are continuously collected on a filter paper via an isokinetic sampling assembly on each release point. Filters are normally exchanged once per week and then analyzed on an HPGe system. The flow rates for each release point are averaged over the duration of the sampling period and these results - along with specific isotopic concentrations -

are then used to determine the total activity released during the time period in question.

D. Liquid Effluents Each tank of liquid radwaste is recirculated for at least two (2) tank volumes, sampled and analyzed for principal gamma emitters prior to release. Each sample tank is recirculated for a sufficient amount of time prior to sampling ensuring that a representative sample is obtained.

Samples are then analyzed on an HPGe system and liquid release permits are generated based upon the values obtained from the isotopic analysis and the most recent values for H3 , gross Page 15 of 112

alpha, Fe 55 , Sr89 and Sr 90

  • An aliquot based on release volume is saved and added to composite containers. The concentrations of composited isotopes and the volumes of the releases associated with these composites establish the proportional relationships that are then utilized for calculating the total activity released for these isotopes. However, there has not been a radioactive liquid release since September of 1992.

IV. DESCRIPTION OF ERROR ESTIMATES Estimates of measurement and analytical error for gaseous and liquid effluents are calculated as follows:

where: E1 = total percent error fa ... EN =*percent error due to calibration standards, laboratory analysis, instruments, sample flow, etc.

Page 16 of 112

SECTION 4 RADIOACTIVE EFFLUENT DATA TABLE 1 Gaseous Effluents - Summation Of All Releases Data Period: January 01, 2022 - December 31, 2022 Continuous Mixed Mode Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 Est. Total Error,%

A. Fission & Activation Gases

1. Total Release Ci 5.00E+OO 3.40E+OO 1.51E+Ol 5.95E+OO 3.00E+Ol
2. Average release rate

µCi/sec for period 6.44E-01 4.33E-01 1.90E+OO 7.49E-01

3. Percent of ODCM Limit * * *
1. Total lodine-131 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 3.10E+Ol
2. Average release rate

µCi/sec for period O.OOE+OO O.OOE+OO O.OE+OO O.OE+OO

3. Percent of ODCM Limit * * *
  • C. Particulates
1. Particulates with Ci 2.40E+Ol half-lives >8 days 1.19E-05 0.00E+OO O.OOE+OO O.OOE+OO
2. Average release rate

µCi/sec for period 1.53E-06 O.OOE+OO O.OOE+OO O.OOE+OO

3. Percent of ODCM Limit * * *
1. Total Release Ci 6.99E+OO 6.97E+OO 6.63E+OO 8.66E+OO 2.10E+Ol
2. Average release rate

µCi/sec for period 8.99E-01 8.87E-01 8.34E-Dl 1.09E+OO

3. Percent of ODCM Limit * * *
  • E. Gross Alpha
1. Total Release Ci <LLD <LLD <LLD <LLD
2. Average release rate

µCi/sec O.OOE+OO O.OOE+OO O.OOE+OO 0.00E+OO for period F. Carbon-14

1. Total Release Ci 4.0lE+OO 4.35E+OO 4.38E+OO 4.41E+OO
2. Average release

µCi/sec 5.16E-01 5.53E-01 5.51E-01 5.SSE-01 Rate for period

  • Applicable limits are expressed in terms of dose. See Tables 1A and 18 of this report.

Page 17 of 112

TABLE 1A Air Doses Due to Gaseous Releases Doses per Quarter (mRad)

Type of ODCM 2nd 3rd pt Quarter  % of Limit  % of Limit  % of Limit 4 th Quarter  % of Limit Radiation Limit Quarter Quarter 5

Gamma 1.09E-04 2.18E-03 1.58E-04 3.16E-03 7.0lE-04 1.40E-02 2.76E-04 5.52E-03 mRad 10 Beta 6.S0E-05 6.S0E-04 5.SGE-05 S.56E-04 2.47E-04 2.47E-03 9.72E-05 9.72E-04 mRad Doses per Year (mRad)

Type of Radiation ODCM Limit Year  % of Limit Gamma 10 mRad 1.24E-03 1.24E-02 Beta 20 mRad 4.68E-04 2.34E-03 TABLE 1B Doses to a Member of the Public Due to Radioiodines, Tritium, Carbon-14, and Particulates in Gaseous Release Doses per Quarter (mRem)

ODCM pt  % of 2nd  % of 3rd  % of 4th  % of Organ limit Quarter limit Quarter Limit Quarter limit Quarter Limit Bone 7.5 mRem 7.27E-02 9.69E-01 7.89E-02 1.0SE+00 7.94E-02 1.06E+00 8.00E-02 1.07E+00 Liver 7.5 mRem 1.77E-04 2.36E-03 1.76E-04 2.34E-03 1.67E-04 2.23E-03 2.18E-04 2.91E-03 TBody 7.5 mRem 1.47E-02 1.96E-01 1.59E-02 2.13E-01 1.G0E-02 2.14E-01 1.62E-02 2.16E-01 Thyroid 7.5 mRem 1.76E-04 2.35E-03 1.76E-04 2.34E-03 1.67E-04 2.23E-03 2.18E-04 2.91E-03 Kidney 7.5 mRem 1.76E-04 2.35E-03 1.76E-04 2.34E-03 1.67E-04 2.23E-03 2.18E-04 2.91E-03 Lung 7.5 mRem 1.76E-04 2.35E-03 1.76E-04 2.34E-03 1.67E-04 2.23E-03 2.18E-04 2.91E-03 GILLI 7.5 mRem 1.77E-04 2.35E-03 1.76E-04 2.34E-03 1.67E-04 2.23E-03 2.18E-04 2.91E-03 Doses per Year (mRem)

Type of Organ ODCM limit Dose  % of Limit Bone 15 mRem 3.llE-01 2.07E+00 Liver 15 mRem 7.38E-04 4.92E-03 TBody 15 mRem 6.29E-02 4.19E-01 Thyroid 15 mRem 7.37E-04 4.91E-03 Kidney 15 mRem 7.37E-04 4.91E-03 Lung 15 mRem 7.37E-04 4.91E-03 GILLI 15 mRem 7.37E-04 4.91E-03 Page 18 of 112

TABLE 2 Gaseous Effluents - Nuclides Released Clinton Power Station YEAR: 2022 Mixed Mode Release X Elevated Release I Continuous Mode X Ground-Level Release Batch Mode Units Quarter 1[ 1J Quarter 2[ 11 Quarter 3[ 11 Quarter 4[ 11 A. Fission Gases XeBs Ci 3.35E+00 <LLD <LLD <LLD Krssm Ci <LLD <LLD <LLD <LLD Xe 133 Ci <LLD <LLD <LLD <LLD Krss Ci <LLD <LLD <LLD <LLD Ar41 Ci 1.GSE+00 3.40E+00 1.51E+00 5.95E+00 Total for Period Ci 5.00E+00 3.40E+00 1.51E+00 5.95E+00 B. Iodines 1131 Ci <LLD <LLD <LLD <LLD 1133 Ci <LLD <LLD <LLD <LLD Total for Period Ci * <LLD <LLD <LLD. <LLD C. Particulates Co6 Ci <LLD <LLD <LLD <LLD y91m [2] Ci <LLD <LLD <LLD <LLD Nbgs Ci <LLD <LLD <LLD <LLD ce141 Ci <LLD <LLD <LLD <LLD CrSl Ci <LLD <LLD <LLD <LLD Mns4 Ci 1.19E-05 <LLD <LLD <LLD Na 24 [21 Ci <LLD <LLD <LLD <LLD Cd109 Ci <LLD <LLD <LLD <LLD Cs138 [2] Ci <LLD <LLD <LLD <LLD cos8 Ci <LLD <LLD <LLD <LLD zn65 Ci <LLD <LLD <LLD <LLD Total for Period Ci 1.19E-05 <LLD <LLD <LLD D. Gross Alpha Gross Alpha Ci <LLD <LLD I <LLD <LLD E. Tritium Total for Period Ci 6.99E+00 6.97E+00 I 6.63E+00 8.66E+00 F. Carbon-14 Total for Period Ci 4.01E+00 4.35E+00 I 4.38E+00 4.41E+00

[1]

The lower the value of the actual sample activity - with respect to background activity -

the greater the counting error. Proportionally, large errors are reported for the various components of CPS gaseous effluents because of their consistent low sample activity.

[2]

Half-life is less than 8 days, therefore not included in Table 1 Summation.

Page 19 of 112

TABLE 3 Radioactive Gaseous Waste LLD Values Lower Limit of Detectiona TYPE OF ACTIVITY ANALVSIS

(µCi/cc)

Principal Gamma Emitters, sl.00E-04

[Noble Gases] b,c H3C sl.00E-06 1131 d sl.00E-12 1133 d sl.00E-10 Principal Gamma Emitters, sl.00E-11

[Particulates] b,e Sr89 , Sr90 g sl.00E-11 Gross Alphaf sl.00E-11 Table 3 Notations:

a The Lower Limit of Detection (LLD) as defined for purposes of these specifications, as an "a priori" determination of the smallest concentration of radioactive material in a sample that will yield a net count - above system background - that will be detected with a 95% probability and with a low (5%) probability of incorrectly concluding that a blank observation represents a "real" signal.

For a particular measurement system, which may include radiochemical separation:

LLD E

  • V
  • 2.22 x 106
  • Y
  • e-Mt Where:

LLD is the "a priori" lower: limit of detection as defined above, as µCi per unit mass or volume, Sb is the standard deviation of the background counting rate or of the counting rate of a blank sample as appropriate, in counts per minute (cpm),

Page 20 of 112

Table 3 Notations (continued):

Eis the counting efficiency, in counts per disintegration, Vis the sample size in units of mass or volume, 2.22E+06 is the number of disintegrations per minute (dpm) per microcurie, Vis the fractional radiochemical yield, when ap-plicable, A is the radioactive decay constant for the particular radionuclide (sec-1) and M for plant effluents is the elapsed time between the midpoint of sample collection and the time of counting (sec).

Typical values of E, V, V, and L1t should be used in the calculation.

The LLD is defined as an a priori (before the fact) limit representing the capability of a measurement system and not as an a posteriori (after the fact) limit for a. particular measurement.

b The principal gamma emitters for which the LLD specification applies include the following radionuclides: Kr 87 , Kr 88 , Xe 133 , Xe 133 m, Xe 135 , and Xe 138 in noble gas releases and Mn 54, Fe 59 , Co 58 , Co 60 , Zn 65 , Mo 99 , 1131, 1133 , Cs 134, Cs 137 , Ce 141 , and Ce 144 in iodine and particulate releases. This list does not mean that only these nuclides are to be considered. Other gamma peaks that are identifiable - together with those of the above nuclides - shall also be analyzed and reported in the Radioactive Effluent Release Report.

c Weekly grab sample and analysis d Continuous charcoal sample analyzed weekly e Continuous particulate sample analyzed weekly f Composite particulate sample analyzed monthly g Composite particulate s~mple analyzed quarterly Page 21 of 112

TABLE 4 Waterborne Effluents - Summation Of All Releases Data Period: January 01, 2022 - December 31, 2022 There were zero (O) liquid radwaste releases from CPS in 2022.

Est.

Quarter Quarter Quarter Quarter Total Units 1 2 3 4 Error,%

A. Fission & Activation Productsl 1 J

1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A Average dilu*ted
2. concentration µCi/ml 0.00E+00 0.00E+00 0.00E+00 0.00E+00 during period Percent of ODCM
3.  % N/A N/A N/A N/A Limit B. Tritium 111
1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A Average diluted
2. concentration µCi/ml 0.00E+00 0.00E+00 0.00E+00 0.00E+00 during period Percent of ODCM
3.  % N/A N/A N/A N/A Limit C. Dissolved and Entrained Gases 111
1. Total Release Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A Average diluted
2. concentration µCi/ml 0.00E+00 0.00E+00 0.00E+00 0.00E+00 during period Percent of ODCM
3.  % N/A N/A N/A N/A Limit D. Gross Alpha Radioactivity[ 1J
  • Gross alpha radioactivity Ci 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A E. Volume of Waste Released (prior to Dilution)

Volume of Waste Released (prior to Liters 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N/A Dilution)

F. Volume of dilution water used during period Volume of dilution water Liters 0.00E+00 0.00E+00 0.00E+0O 0.00E+00 N/A used during period

[1]

A value corresponding to ten times the values found in 10CFR20 Appendix B, Table 2, Column 2 is used for all Effluent Concentration Limit (ECL) calculations. For dissolved and entrained noble gases, the concentration is limited to. 2.00E-04 µCi/ml total activity.

Page 22 of 112

TABLE 5 Waterborne Effluents - Nuclides Released Clinton Power Station YEAR: 2022 There were'zero (0) liquid radwaste releases from CPS in 2022.

I Continuous Mode Batch Mode Units Quarter 1 Quarter 2 Quarter 3 Quarter 4 A. Tritium Total for Period Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO B. Fission and Activation Products Mns4 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Coss Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Fess Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Fes9 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Coss Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Co&o Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Zn&s Ci 0.00E+OO 0.00E+OO

  • O.OOE+OO 0.00E+OO Srs9 Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO Sr9o Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Nb9s Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO Zr9s Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Mo99 Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO 1131 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO cs134 Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO cs131 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Ba140 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO La140 Ci 0.00E+OO 0.00E+OO O.OOE+OO 0.00E+OO ce141 _ Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Ce144 Ci O.OOE+OO 0.00E+OO O.OOE+OO 0.00E+OO Total for Period Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO C. Dissolved and Entrained Noble Gases KrSSm Ci ci.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO Krs1 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Krss Ci 0.00E+OO 0.00E+OO O.OOE+OO O.OOE+OO xe133 Ci O.OOE+OO 0.00E+OO O.OOE+OO O.OOE+OO Xe13s Ci O.OOE+OO O.OOE+OO O.OOE+OO - O.OOE+OO xe13s Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Total for Period Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Page 23 of 112

TABLE 6 Radioactive Liquid Waste LLD Values TYPE OF ACTIVITY ANALYSIS Lower Limit of Detection (LLD) a

(µCi/ml)

Principal Gamma Emitters b :s;S.00E-07

,131 sl.00E-06 Dissolved and Entrained Gases sl.00E-05 (Gamma Emitters) c H3 sl.00E-05 Gross Alpha ~1.00E-07 srs9, Srgo sS.00E-08 Fess sl.00E-06 Table 6 Notations:

  • The Lower Limit of Detection (LLD) as defined for purposes of these specifications, as an "a priori" determination of the smallest concentration of radioactive material in a sample that will yield a net count - above system background - that will be detected with a 95% probability and with only a 5% probability of falsely concluding that a blank observation represents a "real" signal.

For a particular measurement system, which may include radiochemical separation:

LLD= . 4.66-sb E

  • V
  • 2.22 x 10 6
  • Y
  • e-Mt Where:

LLD is the "a priori" lower limit of detection as defined above, as µCi per unit mass or volume, Sb is the standard deviation of the background counting rate or of the counting rate of a blank sample as appropriate, in counts per minute (cpm),

E is the counting efficiency, as counts per disintegration, V is the sample size in units of mass or volume, 2.22E+06 is the number of disintegrations per minute (dpm) per microcurie, Page 24 of 112

Table 6 Notations {continued):

Y is the fractional radiochemical yield, when applicable,

'A is the radioactive decay constant for the particular radionuclide {sec- 1 ) and

~1 for plant effluents is the elapsed time between the midpoint of sample collection and the time of counting {sec).

Typical values of E, V, Y, and 'At should be used in the calculation.

The LLD is defined as an a priori (before the fact) limit representing the capability of a measurement system and not as an a posteriori (after the fact, MDA) limit for a particular measurement.

b The principal gamma emitters for which the LLD requirement applies include the following radionuclides: Mn 54 , Fe 5 g, Co 58 , Co 60 , Zn 65 , Mogg, Cs 134 , Cs 137 , and Ce 141 . Ce 144 shall also be measured, but with an LLD of 5.0E-06. This list does not mean that only these nuclides are detected and reported. Other gamma peaks that are measurable -

together with those of the above nuclides - shall also be analyzed and reported in the Radioactive Effluent Release Report.

c Dissolved and entrained gases are: Xe 133 , Xe 135 , Xe 138 , Kr 85 m, Kr 87 and Kr 88 .

Page 25 of 112

BATCH RELEASES There were zero (0) liquid radwaste releases from CPS in 2022.

A. Batch Liquid Releases: 2022

1. Number of batch releases: 0
2. Total time period for batch releases: N/A
3. Maximum time period for batch release: N/A
4. Average time period for batch release: N/A
5. Minimum time period for batch release: N/A
6. Average stream flow during periods of release: N/A
7. Total waste volume: N/A
8. Total dilution volume: N/A B. Batch Gaseous Releases: 2022
1. Number of batch releases: 0
2. Total time period for batch releases: N/A
3. Maximum time period for batch release: N/A
4. Average time period for batch release N/A
5. Minimum time period for batch release: N/A Page 26 of 112

ABNORMAL RELEASES Information concerning abnormal radioactive liquid and gaseous releases is presented below for the year 2022. There were no abnormal or unplanned liquid or gaseous releases from CPS in 2022.

Liquid Releases:

Number of Abnormal Liquid Releases: Zero (O)

Activity Released [Ci]: Zero (O)

Gaseous Releases:

Number of Abnormal Gaseous Releases: Zero (O)

Activity Released [Ci]: Zero (O)

Page 27 of 112

SECTION 5 SOLID WASTE DISPOSAL INFORMATION During this reporting period -January 01, 2022 through December 31, 2022 - there were twenty-one (21) radioactive waste shipments and zero (0) irradiated fuel shipments from CPS.

In addition, the CPS ODCM requires reporting of the following information for solid waste shipped offsite during the above reporting period:

1. Container volume:

Class A Waste: 3.21E+02 m 3 / Class B Waste: 0.00E+00 m 3 / Class C Waste: 0.00E+00 m 3 This total includes Dry Active Waste (DAW), resins, filter sludges, evaporator bottoms, and other low level waste such as other waste-mixed.

2. Total curie quantity: Class A Waste was 1.88E+0l curies and Class B Waste was 0.00E+00 curies and Class C Waste was 0.00E+00 curies in 2022 (determined by dose-to-curie and sample concentration methodology estimates).
3. Principal radionuclides: See Table 7-A.2 for listing of measured radionuclides.
4. Source of waste and processing employed: Non-compacted dry active waste, resins, filter sludges and evaporator bottoms dewatered.
5. Type of container: General Design and Type A Containers.
6. Solidification agent or absorbent: None.

Page 28 of 112

TABLE 7 Solid Waste and Irradiated Fuel Shipments A.1 Estimate of Solid Waste Shipped Offsite for Burial or Disposal: [NOT irradiated fuel]

January - December Est. Total Error, A.1 Type of Waste Units 2022  %

m3 8.57E+0l Spent resins, filter sludges,

a. 2.S0E+0l evaporator bottoms, etc.

Ci 1.54E+01 m3 2.28E+02 Dry compactable waste,

b. 2.S0E+0l contaminated equipment, etc.

Ci 3.40E+0O m3 0.00E+00 Irradiated components, C. 2.S0E+0l control rods, etc. (not fuel)

Ci 0.00E+00 m3 6.97E+00

d. Other Wastes-Mixed 2.S0E+0l Ci 6.80E-03
  • Total curie quantity and principal radionuclides were determined by measurements.

A.2 Estimate of Major Nuclide Composition (by type of waste):

1. Spent resins, filters, evaporator bottoms, etc.

Waste Class Nuclide Name  % Percent Abundance Curies A C-14 8.2% l.27E+00 Cr-51 1.03% l.SSE-01 Mn-54 41.24% 6.36E+00 Fe-55 8.98% l.39E+00 Fe-59 1.56% 2.41E-01 Co-58 2.06% 3.17E-01 Co-60 16.16% 2.49E+00 Zn-65 18.1% 2.79E+00

2. Dry compactable waste, contaminated equipment, etc.

Waste Class Nuclide Name  % Percent Abundance Curies A Mn-54 31.62% l.08E+00 Fe-55 38.86% l.32E+00 Fe-59 1.07% 3.GSE-02 Co-60 23.02% 7.83E-01 Ni-63 2.57% 8. 72E-02 Zn-65 1.67% 5.67E-02 Page 29 of 112

TABLE 7 (continued)

Solid Waste and Irradiated Fuel Shipments

3. Irradiated Components Waste Class Nuclide Name  % Percent Abundance Curies C N/A N/A N/A
4. Other Wastes - Mixed Waste Class Nuclide Name  % Percent Abundance Curies A Mn-54 28.78% 1.96E-03 Fe-55 48.53% 3.30E-03 Fe-59 1.53% 1.04E-04 Co-60 18.67% 1.27E-03 Zn-65 1.34% 9.llE-05 A.3 Solid Waste Disposition:

January - December 2022 Number of Shipments Mode of Transportation Destination 10 Hittman Transport Energy Solutions Bear Creek 1560 Bear Creek Road 11 Hittman Transport EnergySolutions LLC.

Clive Disposal Site - Treatment Facility B. Irradiated Fuel Shipments Disposition:

January - December 2022 Number of Shipments Mode of Transportation Destination 0 N/A N/A Page 30 of 112

SECTION 6 DOSE MEASUREMENTS AND ASSESSMENTS This section of the Annual Effluent Release Report provides the dose received by receptors around CPS from gaseous and liquid effluents. The dose to the receptor that would have received the highest dose in each sector (defined as the Critical Receptor for that sector) is listed within this report. This section also provides the dose to individuals who were inside the Site Boundary. This section also summarizes CPS's compliance with the requirements found within 40CFR190.

The 2022 maximum expected annual dose from Carbon-14 released from CPS has been calculated using the methodology included in the EPRI Technical Report 1021106 using the maximum gross thermal capacity maintained for 320.2 days of equivalent full power operation.

The assumptions used in determining dose values are as follows:

  • All receptors within a five (5) mile radius are included in the Annual Land Use Census. This Annual Census determines what dose pathways are present as well as the distance of each receptor from the site.
  • The annual average meteorological data for 2022 was used in conjunction with the Annual Land Use Census to determine the dose to each receptor within five (5) miles.
  • The doses for each receptor from each sector were determined using methodologies given in the ODCM.
  • The activity used in these assessments is the total activity released by CPS for the year 2022 not including radionuclides with half-lives less than eight (8) days and when dose pathway factors were unavailable.
  • The occupancy factor was taken into consideration by calculating the dose to individuals using areas inside the Site Boundary in non-residential areas. The occupancy factor is determined by dividing the number of hour(s) of occupancy per year (taken from the ODCM) and dividing that value by the total number of hour(s) per year.
  • Dose to individuals using areas inside the Site Boundary (that are not residents) was calculated using the Ground Plane and Inhalation pathways.

Page 31 of 112

TABLE 8 Maximum Offsite Doses and Dose Commitments To Members of the Public in Each Sector Data Period: January 01, 2022 - December 31, 2022 This table illustrates the dose that a member from the public would most likely be exposed to from radioactive effluents in each sector from CPS. These values represent the maximum dose likely to expose a member of the public in each sector.

AIRBORNE EFFLUENT DOSE WATERBORNE RECEPTOR INFORMATION EFFLUENT DOSE Iodines and Particulates Noble Gases (mRem) 111 (mRem) (mRad)

Distance Total Total Sector Pathways Organ Age Organ Skin Gamma Beta Organ (km) Body Body N 1.50 GP, I, M, V B A 1.31E-01 1.49E-06 2.32E-02 1.38E-03 6.SSE-04 0.00E+00 0.00E+00 NNE 1.50 GP, I, V B A 7.61E-02 1.60E-06 1.57E*02 1.27E-03 6.33E-04 NE 2.07 GP, I B A 6.91E-04 5.46E-07 2.12E-04 5.53E-04 2.7SE-04 ENE 2.86 GP, I, V B C 8.lSE-02 2.82E-07 1.63E-02 3.52E-04 1.75E-04 E 1.67 GP, I, V B A 3.56E-02 8.68E-07 7.37E-03 S.96E-04 2.96E-04 ESE 5.14 GP, I B A S.46E-04 2.53E-07 1.67E-04 4.37E-04 2.17E-04 SE 4.44 GP, I B C 1.07E-03 2.99E-07 2.57E-04 4.31E-04 2.lSE-04 SSE 2.90 GP, I, V B A 1.89E-02 2.43E-07 3.90E-03 3.lSE-04 1.57E-04 s 4.78 GP, I B A 3.48E-04 1.49E-07 1.07E-04 2.79E-04 1.39E-04 SSW 4.68 GP, I B A 2.86E-04 1.00E-07 8.77E-0S 2.29E-04 1.14E-04 SW 1.17 GP, I, V B A 4.27E-02 8.68E-07 8.83E-03 7.14E-04 3.SSE-04 WSW 3.62 GP, I, M,V B A 1.77E-03 1.llE-07 3.63E-03 2.16E-04 1.0SE-04 w 1.95 GP, I B T 3.90E-04 3.16E-06 l.0SE-04 2.16E-04 1.0SE-04 WNW 2.63 GP, I, V B A 1.79E-02 1.61E-07 3.70E-03 2.99E-04 1.49E-04 NW 2.65 GP, I, V B A 2.04E-02 2.07E-07 4.22E-03 3.41E-04 1.70E-04 NNW 2.05 GP, I, M, V B A S.47E-02 S.07E-07 1.12E-03 6.71E-04 3.34E-04 Key for Table 8 Pathways Organ Age GP= Ground Plane B = Bone A= Adult I = Inhalation T = Teen M = Meat I= Infant V = Vegetation C = Child f11There were zero (0) liquid radwaste releases from CPS in 2022. All doses were within all regulatory limits, including limits from 40CFR190.

Page 32 of 112

COMPLIANCE WITH 40CFR190 REQUIREMENTS Dosimeter of Legal Records (DLRs) are stationed around CPS to measure the ambient gamma radiation field. Monitoring stations are placed near the site boundary, which includes the Independent Spent Fuel Storage Installation (ISFSI) pad, and approximately five (5) miles from the reactor, in locations representing the sixteen (16) compass sectors. Other locations are chosen to measure the radiation field at places of special interest such as nearby residences, meeting places and population centers. Control sites are located further than ten (10) miles from the site, in areas that should not be affected by plant operations. The results from the field dosimeters are reported in the Annual Radiological Environmental Operating Report (AREOR) and indicated no excess dose to offsite areas. The organ and whole body doses reported in the above tables are determined using 10CFR50 Appendix I methodology, which encompasses the limits of 40CFR190. The requirement requires the preparation and submittal of a Special Report whenever the calculated doses from plant generated radioactive effluents and direct radiation exceed 25 mRem to the total body or any organ, except the thyroid, which shall be limited to less than or equal to 75 mRem. During 2022, Clinton Power Station operated at 2.52E-01% (6.29E-02 mrem) of the 40CFR190 total body limit, 1.24E+00% of the 40CFR190 organ limit (3.llE-01 mrem) and 9.83E-04% 40CFR190 thyroid limit (7.37E-04 mrem).

INDENDENDENT SPENT FUEL STORAGE INSTALLATION {ISFSI)

No radioactive effluents were released from the Clinton Station ISFSI and seven additional casks were placed on the pad for the period January 1, 2022 through December 31, 2022. Over the long term, as more storage modules containing dry shielded canisters of spent fuel are placed on the ISFSI pad, it is expected that ISFSI operations will become the prominent contributor to dose limits in this section. ISFSI dose contribution is in the form of direct radiation as no liquid or gas releases are expected to occur from the ISFSI canisters. The CPS 10CFR72.212 Report prepared in accordance with 10CFR72 requirements assumes a certain array of storage modules exists on the pad.

The dose contribution from this array of casks combination with historical uranium fuel cycle operations prior to ISFSI operations was analyzed to be within 40CFR190 and 10CFR72.104 limits and is documented in Holtec Report No. Hl-2135750, Site Boundary Dose Rate Calculations for HI-STORM FW System for Clinton Power Station. The REMP Dosimeters recorded no net direct radiation dose to any Member of the Public from ISFSI.

DOSE TO MEMBERS OF THE PUBLIC WITHIN THE SITE BOUNDARY CPS Offsite Dose Calculation Manual section 6.2 requires that the Radioactive Effluent Release Report include an assessment of the radiation doses from radioactive liquids and gaseous effluents to MEMBERS OF THE PUBLIC due to their activities inside the SITE BOUNDARY.

Within the CPS site boundary there are seven areas that are open to members of the public as identified by CPS ODCM Table 5-3 (see Figure 4):

The Department of Natural Resources Recreation Area at 1.287 kilometers (0.8 miles) in the ESE sector "-'

A road at 0.495 kilometers (0.3 miles) in the SE sector A residence at 2.736 kilometers (1.7 miles) in the SSE sector A residence at 1.219 kilometers (0.8 miles) in the SW sector Page 33 of 112

Agricultural acreage at 1.372 kilometers (0.9 miles) in the SSW sector A residence at 2.414 kilometers (1.5 miles) in the WSW sector A portion of Clinton Lake at 0.335 kilometers (0.2 miles) in the NW sector At all ofthe above locations, the plume, inhalation and ground-plane exposure pathways are used for dose calculations. The 2022 Annual Land Use Census identified no other exposure pathways. All dose calculations were performed using the methodology contained in the CPS ODCM, with the exception of dose due to C-14, which was calculated using methodology included in the EPRI Technical Report 1021106.

Page 34 of 112

FIGURE 4 AREAS WITHIN THE CPS SITE BOUNDARY OPEN TO MEMBERS OF THE PUBLIC

=--.7l---

NOTES:

fvtAROA 1. Road 0.3 miles in SE Sector

2. Agricultural acreage 0.9 miles in SSW Sector
3. Clinton Lake 0.2 miles in the NW Sector
4. Department of Natural Resources Recreation Area 0.8 miles in ESE Sector
5. Residence 0.8 miles in SW Sector
6. Residence 1.5 miles in WSW Sector
7. Residence 1.7 miles in SSE Sector WELDON TO CHAMPAIGN Page 35 of 112

TABLE 9 Calculated Doses to Members of the Public During Use of the Department of Natural Resources Recreation Area in the East-Southeast Sector within the CPS Site Boundary Data Period: January 01, 2022 - December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 2.B0E-04 mRem/year Ski11__~9se Rate JN_oble Gases) 0 4.lSE-04 !11Rem/y_~~r Gamma Air Dose 2.93E-04 mRad Beta Air Dose 1.46E-04 mRad Total Body Dose[1 l 1.75E-04 mRem Skin Dosel 1l 7.33E-07 mRem 111 Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 3.66E-04 mRem Teen Bone S.23E-04 mRem Child Bone 7.22E-04 mRem Infant Bone S.33E-04 mRem Page 36 of 112

TABLE 10 Calculated Doses to Members of the Public During Use of the Road in the Southeast Sector within the CPS Site Boundary Data Period: January 01, 2022 -December 31, 2022

. DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 8.47E-05 mRem/year

-~~i_ri D_o~-~ ~<!t<<:J~~_!>l_e G_a~~sl._ ___ _ 1.25E-04

  • mRem/year

-- -=---~ -~-= ._- --~:._-_--_-_-~ .-_ ,..~---~-~]

Gamma Air Dose 9.63E-05 mRad Beta Air Dose 4.80E-05 mRad Total Body Dose[ 1 l 5.77E-05 mRem Skin Dose[ 1 l 2.58E-07 mRem

[ll Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 1.21E-04 mRem Teen Bone 1.73E-04 mRem Child Bone 2.38E-04 mRem l*nfant Bone 1.76E-04 mRem Page 37 of 112

TABLE 11 Calculated Doses for the Residents in the South-Southeast Sector within the CPS Site Boundary Data Period: January 01, 2022 - December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate {Noble Gases) 3.08E-04 mRem/year 4.56E-04 r:!_l_~E:'!1/Year

-- Sk!n Do~~__R_a!e J~o~_!_E: c§-~~e~L ___ -- - - --- --**-*

-*-*------- V

~

~------ *1 Gamma Air Dose 3.24E-04 mRad Beta Air Dose l.61E-04 mRad Total Body Dosel 1 l l.93E-04 mRem Skin Doser 11 4.25E-07 mRem 111 Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 'in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 4.0SE-04 mRem Teen Bone 5.80E-04 mRem Child Bone 8.00E-04 mRem

  • infant Bone 5-.90E-04 mRem Page 38 of 112

TABLE 12 Calculated Doses for the Residents in the Southwest Sector within the CPS Site Boundary Data Period: January 01, 2022 - December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 6.SlE-04 mRem/year

. _S~in Dc:>se Rat~ _(No~le_~~se_s)_ 9.63E-04 ~Re_m/ye~_r Gamma Air Dose 6.85E-04 mRad Beta Air Dose 3.41E-04 mRad Total Body Dose[ 1 J 4.09E-04 mRem Skin Dose[ 1 l 1.33E-06 mRem

[ll Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 8.57E-04 mRem Teen Bone 1.23E-03 mRem Child Bone 1.69E-03 mRem Infant Bone 1.25E-03 mRem Page 39 of 112

TABLE 13 Calculated Doses to Members of the Public During Use of the Agricultural Acreage in the South-Southwest Sector within the CPS Site Boundary Data Period: January 01, 2022 December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 4.16E-04 mRem/year Skin Dose Rate (Noble Gases) 6.lSE-05 mRem/_year Gamma Air Dose 4.37E-05 mRad Beta Air Dose 2.17E-05 mRad Total Body DoseCl] 2.12E-05 mRem Skin DoseC 11 8.37E-08 mRem

[ll Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone S.46E-05 mRem Teen Bone 7.81E-05 mRem Child Bone NAf21 mRem Infant Bone NA 121 mRem r21 Dose(s) are calculated only for the age groups likely to be in the field Page 40 of 112

TABLE 14 Calculated Doses for the Residents in the West-Southwest Sector within the CPS Site Boundary Data Period: January 01, 2022 - December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 2.40E-04 mRem/year Skin Dose Rate (Noble Gases) 3.56E-04 mRem/year Gamma Air Dose 2.53E-04 mRad Beta Air Dose 1.26E-04 mRad Total Body Dose[ 1 J 1.SlE-04 mRem Skin Dose[ 1 J 2.94E-07 mRem

[ll Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 3.16E-04 mRem Teen Bone 4.52E-04 mRem Child Bone 6.24E-04 mRem Infant Bone 4.60E-04 mRem Page 41 of 112

TABLE 15 Calculated Doses to Members of the Public During Use of Clinton Lake in the Northwest Sector within the CPS Site Boundary Data Period: January 01, 2022 - December 31, 2022 DESCRIPTION DOSE UNITS Total Body Dose Rate (Noble Gases) 4.98E-04 mRem/year Skin Dose R~!e_ (Nob_l~ Gases) 7.37E-04 mRem/year Gamma Air Dose 5.20E-04 mRad Beta Air Dose 2.SSE-04 mRad Total Body Dosel 1 l 3.l0E-04 mRem Skin Dosel 1 l 7.63E-07 mRem

[ll Dose includes the dose values resulting from the release of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone 6.49E-04 mRem Teen Bone 9.30E-04 mRem Child Bone 1.28E-03 mRem Infant Bone 9.46E-04 mRem Page 42 of 112

SECTION 7 METEOROLOGICAL DATA AND DISPERSION ESTIMATES On 13 April 1972, the meteorological monitoring program commenced at the Clinton Power Station site. The meteorological system consists of a tower 199 feet high with two (2) levels of instrumentation at the 10-meter and 60-meter elevations. A combined cup and vane sensor measures wind direction and wind speed(s) at the 10-meter and 60-meter levels. An aspirated dual temperature sensor senses the temperatures at these levels. One-half of the dual sensors at each elevation are used for ambient temperature while the other half are used to provide a differential temperature between the 10-meter and 60-meter levels.

Meteorological monitoring instruments have been placed on the Clinton Power Station backup meteorological tower at the 10-meter level to serve as a backup to the primary meteorological tower.

Clinton Power Station meteorological data is transmitted to the Main Control Room (MCR) via a dedicated communication link. Once the signals are received at the MCR, they are then converted to a 4 to 20 milliamp signal and fed individually to a microprocessor and chart recorders. The microprocessor is part of the Clinton Power Station Radiation Monitoring System (RMS). Meteorological data is available via the microprocessors in the Main Control Room and the Technical Support Center (TSC).

Dispersion modeling for effluents for normal operation of Clinton Power Station is a straight-line, sector-averaged Gaussian plume model designed to estimate average relative concentration at various receptor points. The model was developed in accordance with routine release analysis procedures specified in Regulatory Guide 1.111. For joint frequency input data, periods of calm are distributed in accordance with a directional distribution. For hourly input data, periods of calm are the previous hour's wind direction. Periods of calm are assigned a wind speed value of half the specified instrument threshold value. Reference Table 18 for more detailed information on meteorology and dispersion data.

Page 43 of 112

TABLE 16 Meteorological Data Availability Data Period: January 01, 2022 December 31, 2022 PERCENT OF VALID PARAMETER HOURS PARAMETER Quarter 1 Quarter 2 Quarter 3 Quarter 4

1. Wind Speed
a. 10-Meter sensor 98.8 99.4 99.9 100.0
b. 60 Meter sensor 98.8 99.4 99.9 100.0
2. Wind Direction
a. 10-Meter sensor 98.8 99.4 99.9 100.0
b. 60 Meter sensor 98.8 99.4 99.9 100.0
3. Temperature
a. 10-Meter sensor 98.8 99.4 99.9 1.00.0
b. 60 Meter sensor 98.8 96.1 99.9 100.0
c. Temperature Difference (10m-60m) 98.8 96.1 99.9 100.0
4. Percent of hours for which valid 10-meter Wind Speed, Wind Direction, and Delta 98.8 96.1 99.9 100.0 Temperature were available
5. Percent of hours for which valid 60-meter Wind Speed, Wind Direction, and Delta 98.8 96.1 99.9 100.0 Temperature were available Clinton Power Station was able to achieve 99.3% Meteorological Recoverable Data during 2022 exceeding the minimum criteria of 90% as delineated within Regulatory Guide 1.23.

Page 44 of 112

TABLE 17 Classification of Atmospheric Stability Stability Classification Pasquill Category Defining Conditions Extremely unstable A ------ <.1.T ~-1.9 Moderately unstable B -1.9 <AT~ -1.7 Slightly unstable C -1.7 <.1.T~ -1.5 Neutral D -1.5 <.1.T$. -0.5 Slightly stable E -0.5 <AT.$, 1.5

  • Moderately stable F 1.5 <LlT.$_4.0 Extremely stable G 4.0 <AT.$.------

AT= temperature difference in degrees Celsius per 100 meters Page 45 of 112

TABLE 18 Joint Wind Frequency Distribution by Stability Class Reporting Period: January 01, 2022 - December 31, 2022 The following table contains the joint wind frequency tables for CPS. The tables are segregated by sensor evelation and calendar quarter. All tabled values are in hours.

Clinton Power Station Period of Record: January March 2022 Stability Class Extremely Unstable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (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 1 1 0 0 0 2 NE 0 2 6 2 0 0 10 ENE 0 1 0 0 0 0 1 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 1 0 0 0 0 1 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 1 0 0 1 WNW 0 0 4 8 0 0 12 NW 0 0 7 5 2 0 14 NNW 0 0 9 1 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 5 30 17 2 0 54 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: 27 Page 46 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Moderately Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 7 0 0 0 7 NNE 0 0 0 0 0 0 0 NE 0 2 2 1 0 0 5 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 1 4 0 0 0 5 SE 0 0 2 0 0 0 2 SSE 0 0 3 0 0 0 3 s 0 0 1 1 0 0 2 SSW 0 0 6 6 0 0 12 SW 0 2 2 1 0 0 5 WSW 0 0 4 2 0 0 6 w 0 1 3 5 2 0 11 WNW 0 0 5 4 1 0 10 NW 0 0 10 2 1 0 13 NNW 0 1 8 5 0 0 14 Variable 0 0 0 0 0 0 0 Total 0 7 57 27 4 0 95 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: 27 Page 47 of 112

Clinton Power Station Period of Record: January March 2022 Stability Class Unstable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 9 0 0 0 10 NNE 0 2 0 0 0 0 2 NE 0 0 3 4 0 0 7 ENE 0 2 0 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 3 0 0 0 3 SE 0 0 3 0 0 0 3 SSE 0 0 2 0 0 0 2 s 0 2 9 3 0 0 14 SSW 0 2 10 1 0 0 13 SW 1 1 5 1 0 0 8 WSW 0 5 6 2 0 0 13 w 0 3 2 4 2 0 11 WNW 0 2 6 3 3 0 14 NW 0 0 6 6 0 0 12 NNW 0 2 8 5 0 0 15 Variable 0 0 0 0 0 0 0 Total 1 22 72 29 5 0 129 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: 27 Page 48 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Neutral - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 45 53 2 0 107 NNE 1 2 14 23 0 0 40 NE 0 5 25 12 0 0 42 ENE 2 14 33 1 0 0 50 E 0 5 10 0 0 0 15 ESE 1 10 12 3 0 0 26 SE 0 5 18 4 0 0 27 SSE 0 12 46 12 1 0 71 s 1 14 33 24 1 0 73 SSW 0 12 48 34 11 0 105 SW 2 12 27 16 0 0 57 WSW 2 11 21 7 0 0 41 w 0 9 30 16 3 0 58 WNW 1 16 58 44 16 0 135 NW 0 9 61 74 4 0 148 NNW 0 15 53 16 0 0 84 Variable 0 0 0 0 0 0 0 Total 10 158 534 339 38 0 1079 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: 27 Page 49 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 22 7 1 0 0 30 NNE 1 6 1 1 0 0 9 NE 0 9 9 0 0 0 18 ENE 2 5 1 0 0 0 8 E 0 1 0 0 0 0 1 ESE 8 6 1 1 0 0 16 SE 1 12 4 0 0 0 17 SSE 2 32 23 1 0 0 58 s 2 17 62 19 2 0 102 SSW 4 28 41 27 11 1 112 SW 2 21 12 16 1 0 52 WSW 8 13 11 4 0 0 36 w 4 11 13 6 0 0 34 WNW 1 21 15 6 0 0 43 NW 0 14 18 1 0 0 33 NNW o* 12 3 0 0 0 15 Variable 0 0 0 0 0 0 0 Total 35 230 221 83 14 1 584 Hours of calm in this class: 0 Hours of missing wind measurements in this stability class: 0 Hours of mis stability measurements in all stability classes: 27 Page 50 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters 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 0 2 0 0 0 0 2 NE 0 3 1 0 0 1 5 ENE 1 1 0 0 0 0 2 E 1 1 0 0 0 0 2 ESE 4 6 0 0 0 0 10 SE 2 9 1 0 0 0 12 SSE 2 8 1 0 0 0 11 s 1 25 11 0 0 0 37 SSW 1 8 3 0 0 0 12 SW 1 7 1 0 0 0 9 WSW 3 7 0 0 0 0 10 w 3 11 3 0 0 0 17 WNW 0 6 0 0 0 0 6 NW 3 6 0 0 0 0 9 NNW 1 1 0 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 25 101 21 0 0 1 148 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: 27 Page 51 of 112

Clinton Power Station Period of Record: January March 2022 Stability Class - Extremely Stable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (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 4 0 0 0 0 4 ENE 0 1 0 0 0 0 1 E 0 0 0 0 0 0 0 ESE 2 0 0 0 0 0 2 SE 3 0 0 0 0 0 3 SSE 0 5 0 0 0 0 5 s 2 5 0 0 0 0 7 SSW 4 5 1 0 0 0 10 SW 2 3 0 0 0 0 5 WSW 0 2 0 0 0 0 2 w 0 1 0 0 0 0 1 WNW 0 1 0 0 0 0 1 NW 2 0 0 0 0 0 2 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 16 27 1 0 0 0 44 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: 27 Page 52 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Extremely Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 5 0 0 5 NNE 0 0 l 0 0 0 l NE 0 0 5 2 2 0 9 ENE 0 0 l 2 0 0 3 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 l 0 0 0 0 l SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 1 0 0 1 WNW 0 0 1 9 3 0 13 NW 0 0 0 3 4 3 10 NNW 0 0 4 7 0 0 11 Variable 0 0 0 0 0 0 0 Total 0 1 12 29 9 3 54 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: 27 Page 53 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Moderately Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 1 6 0 0 7 NNE 0 0 0 0 0 0 0 NE 0 0 2 1 0 0 3 ENE 0 0 1 0 1 0 2 E 0 0 0 0 0 0 0 ESE 0 0 1 3 0 0 4 SE 0 0 3 0 0 0 3 SSE 0 0 0 3 0 0 3 s 0 0 0 1 1 0 2 SSW 0 1 3 6 4 0 14 SW 0 1 1 1 0 0 3 WSW 0 0 2 3 1 0 6 w 0 1 2 2 2 2 9 WNW 0 0 2 6 3 1 12 NW 0 0 4 5 1 1 11 NNW 0 0 5 7 4 0 16 Variable 0 0 0 0 0 0 0 Total 0 3 27 44 17 4 95 Hours of calm in this stability class: 0 Hours of wind measurements in this stability class: 0 Hours of stability measurements in all stability classes: 27 Page 54 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 3 7 0 0 10 NNE 0 0 2 0 0 0 2 NE 0 0 1 1 2 0 4 ENE 0 0 1 0 2 1 4 E 0 0 1 0 0 0 1 ESE 0 0 0 3 0 0 3 SE 0 0 1 2 0 0 3 SSE 0 0 1 1 0 0 2 s 0 1 5 4 2 1 13 SSW 0 2 8 4 1 0 15 SW 0 1 4 1 1 0 7 WSW 0 0 6 1 2 0 9 w 0 2 6 2 2 1 13 WNW 0 2 2 6 3 4 17 NW 0 0 3 5 2 0 10 NNW 0 0 5 6 5 0 16 Variable 0 0 0 0 0 0 0 Total 0 8 49 43 22 7 129 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: 27 Page 55 of 112

Clinton Power Station Period of Record: January March 2022 Stability Class - Neutral 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 20 30 30 8 91 NNE 0 2 11 11 31 4 59 NE 0 1 3 11 19 3 37 ENE 0 1 9 18 10 0 38 E 0 2 4 24 4 0 34 ESE 0 2 6 7 8 1 24 SE 0 2 4 14 8 1 29 SSE 0 5 14 25 14 4 62 s 0 4 13 3b 21 12 80 SSW 1 5 23 36 18 16 99 SW 1 10 10 25 15 0 61 WSW 0 8 6 18 5 1 38 w 0 5 10 23 6 4 48 WNW 0 7 25 43 37 22 134 NW 0 4 20 61 47 7 139 NNW 0 6 31 44 24 1 106 Variable 0 0 0 0 0 0 0 Total 2 67 209 420 297 84 1079 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: 27 Page 56 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 15 6 3 0 25 NNE 1 3 9 3 1 0 17 NE 0 0 1 7 4 0 12 ENE 0 1 2 5 0 0 8 E 0 1 2 5 0 0 8 ESE 0 4 0 4 0 1 9 SE 1 4 6 5 0 0 16 SSE 0 1 13 27 9 0 50 s 1 5 14 31 34 20 105 SSW 0 2 12 27 42 14 97 SW 1 3 15 22 18 5 64 WSW 1 3 11 13 8 4 40 w 0 6 9 14 4 1 34 WNW 1 1 9 22 6 3 42 NW 0 1 21 11 2 0 35 NNW 0 3 12 7 0 0 22 Variable 0 0 0 0 0 0 0 Total 6 39 151 209 131 48 584 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: 27 Page 57 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind (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 2 1 0 0 1 4 NE 0 0 2 0 0 0 2 ENE 0 0 2 2 0 0 4 E 0 0 0 1 0 0 1 ESE 0 1 1 1 0 0 3 SE 1 0 8 1 0 0 10 SSE 0 1 1 11 2 0 15 s 0 1 4 12 1 0 18 SSW 0 1 3 22 5 0 31 SW 0 0 6 5 0 0 11 WSW 0 0 2 6 0 0 8 w 0 2 4 12 0 0 18 WNW 0 2 5 1 1 0 9 NW 0 1 2 1 0 0 4 NNW 0 0 6 1 0 0 7 Variable 0 0 0 0 0 0 0 Total 1 12 49 76 9 1 148 Hours of calm in this stability class: 0 Hours of wind measurements in this stability class: 0 Hours of stability measurements in all stability classes: 27 Page 58 of 112

Clinton Power Station Period of Record: January - March 2022 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters 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 1 0 0 0 0 1 NE 0 1 0 2 0 0 3 ENE 0 1 0 1 0 0 2 E 0 0 1 1 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 1 0 0 0 0 1 SSE 0 1 0 0 0 0 1 s 0 1 2 6 0 0 9 SSW 0 0 1 1 0 0 2 SW 0 0 2 6 1 0 9 WSW 0 0 5 3 0 0 8 w 0 0 3 1 0 0 4 WNW 0 0 0 0 0 0 0 NW 0 0 1 0 0 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 6 16 21 1 0 44 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: 27 Page 59 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Extremely Unstable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 4 0 0 0 11 NNE 0 4 0 0 0 0 4 NE 0 1 7 1 0 0 9 ENE 0 0 9 0 0 0 9 E 0 0 .5 0 0 0 5 ESE 0 0 2 0 0 0 2 SE 0 0 1 5 0 0 6 SSE 0 1 0 0 0 0 1 s 0 ,5 2 0 0 0 7 SSW 0 3 11 1 0 0 15 SW 0 3 15 4 0 0 22 WSW 0 0 11 3 2 0 16 w 0 0 10 1 0 0 11 WNW 0 0 6 9 0 0 15 NW 0 2 23 6 0 0 31 NNW 0 1 9 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 27 115 30 2 0 174 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 stabi classes: 84 Page 60 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters 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 1 1 0 0 0 2 NE 0 0 0 0 0 0 0 ENE 0 1 3 0 0 0 4 E 0 1 5 0 0 0 6 ESE 0 0 2 0 0 0 2 SE 0 0 6 2 0 0 8 SSE 0 3 3 2 0 0 8 s 0 6 6 2 0 0 14 SSW 0 5 11 5 0 0 21 SW 1 3 8 0 0 0 12 WSW 0 0 2 2 1 1 6 w 0 1 3 0 0 0 4 WNW 0 2 2 4 0 0 8 NW 0 1 10 2 0 0 13 NNW 0 3 4 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 1 31 69 19 1 1 122 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing measurements in all stability classes: 84 Page 61 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 0 0 0 0 3 NNE 0 2 1 1 0 0 4 NE 0 6 3 0 0 0 9 ENE 0 0 1 0 0 0 1 E 0 1 3 0 0 0 4 ESE 0 1 1 0 0 0 2 SE 0 1 4 0 0 0 5 SSE 1 5 2 5 0 0 13 s 2 7 2 5 0 0 16 SSW 1 3 5 2 0 0 11 SW 0 5 8 3 0 0 16 WSW 0 2 1 0 2 0 5 w 0 3 1 0 1 0 5 WNW 0 1 7 3 1 0 12 NW 0 2 7 4 0 0 13 NNW 0 5 2 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 4 47 48 23 4 0 126 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: 84 Page 62 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Neutral - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 17 29 1 0 0 49 NNE 0 12 18 3 0 0 33 NE 0 7 14 1 0 0 22 ENE 0 10 12 0 0 0 22 E 0 11 19 0 0 0 30 ESE 1 22 6 0 0 0 29 SE 3 22 39 1 0 0 65 SSE 1 22 36 17 0 0 76 s 5 18 30 25 7 0 85 SSW 4 12 33 21 14 0 84 SW 0 15 20 3 0 0 38 WSW 1 10 7 13 3 0 34 w 0 9 15 12 3 0 39 WNW 1 11 37 19 3 0 71 NW 5 20 23 10 3 0 61 NNW 1 17 9 0 0 0 27 Variable 0 0 0 0 0 0 0 Total 24 235 347 126 33 0 765 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: 84 Page 63 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 18 11 0 0 0 31 NNE 1 11 7 4 0 0 23 NE 2 18 12 0 0 0 32 ENE 0 15 5 0 0 0 20 E 3 14 12 0 0 0 29 ESE 2 39 13 0 0 0 54 SE 4 32 3 0 0 0 39 SSE 5 30 21 8 0 0 64 s 6 43 48 17 1 0 115 SSW 2 25 42 20 0 0 89 SW 2 22 19 3 0 0 46 WSW 3 11 17 2 0 0 33 w 0 15 11 3 0 0 29 WNW 7 12 18 3 0 0 40 NW 6 20 8 2 0 0 36 NNW 3 17 0 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 48 342 247 1 0 700 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: 84 Page 64 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 4 0 0 0 0 7 NNE 3 5 0 0 0 0 8 NE 2 11 0 0 0 0 13 ENE 6 2 0 0 0 0 8 E 1 5 0 0 0 0 6 ESE 2 5 0 0 0 0 7 SE 2 5 0 0 0 0 7 SSE 1 3 0 0 0 0 4 s 1 4 1 0 0 0 6 SSW 2 6 3 0 0 0 11 SW 3 5 0 0 0 0 8 WSW 2 3 0 0 0 0 5 w 6 4 0 0 0 0 10 WNW 8 10 0 0 0 0 18 NW 4 7 0 0 0 0 11 NNW 3 3 0 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 49 82 4 0 0 0 135 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: 84 Page 65 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters 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 8 3 0 0 0 0 11 NE 8 4 0 0 0 0 12 ENE 8 2 0 0 0 0 10 E 2 0 0 0 0 0 2 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 2 0 0 0 0 2 s 3 0 0 0 0 0 3 SSW 0 0 0 0 0 0 0 SW 2 0 0 0 0 0 2 WSW 2 2 0 0 0 0 4 w 3 2 0 0 0 0 5 WNW 10 2 0 0 0 0 12 NW 6 2 0 0 0 0 8 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 58 20 0 0 0 0 78 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: 84 Page 66 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Extremely Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 9 1 0 0 12 NNE 0 1 4 0 0 0 5 NE 0 0 0 5 0 0 5 ENE 0 0 2 7 0 0 9 E 0 0 0 8 0 0 8 ESE 0 0 2 0 0 0 2 SE 0 0 1 1 4 0 6 SSE 0 0 1 0 0 0 1 s 0 2 5 0 0 0 7 SSW 0 0 7 9 1 0 17 SW 0 0 12 5 3 0 20 WSW 0 0 4 7 3 2 16 w 0 0 7 2 1 0 10 WNW 0 1 3 8 3 0 15 NW 0 0 5 23 2 0 30 NNW 0 0 8 3 0 0 11 Variable 0 0 0 0 0 0 0 Total 0 6 70 79 17 2 174 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: 84 Page 67 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class Moderately Unstable 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 3 0 0 7 NNE 0 0 2 1 0 0 3 NE 0 0 0 0 0 0 0 ENE 0 0 2 2 0 0 4 E 0 0 1 4 1 0 6 ESE 0 0 1 1 0 0 2 SE 0 0 0 4 3 0 7 SSE 0 1 3 1 2 3 10 s 0 4 7 2 3 1 17 SSW 0 1 7 6 1 1 16 SW 0 1 6 2 1 0 10 WSW 0 2 0 2 1 3 8 w 0 1 2 0 0 0 3 WNW 0 2 1 3 4 0 10 NW 0 0 8 4 1 0 13 NNW 0 1 3 2 0 0 6 Variable 0 0 0 0 0 0 0 Total 0 13 47 37 17 8 122 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: 84 Page 68 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters 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 0 1 2 1 0 0 4 NE 0 2 4 1 0 0 7 ENE 0 0 2 1 0 0 3 E 0 0 1 3 0 0 4 ESE 0 0 1 1 0 0 2 SE 0 0 0 4 1 0 5 SSE 0 6 1 2 3 2 14 s 0 7 1 2 5 0 15 SSW 1 0 3 4 2 0 10 SW 1 2 6 3 2 0 14 WSW 0 1 3 3 0 2 9 w 0 2 1 0 0 1 4 WNW 0 1 4 3 2 1 11 NW 0 1 5 3 3 0 12 NNW 0 1 6 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 2 26 42 32 18 6 126 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: 84 Page 69 of 112

Clinton Power Station Period of Record: April June 2022 Stability Class Neutral - 60m-10m Delta-T (Fl Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 5 15 22 1 0 43 NNE 1 3 10 13 3 1 31 NE 0 3 6 8 3 0 20 ENE 0 1 12 13 3 0 29 E 0 3 4 15 4 0 26 ESE 0 1 9 18 1 0 29 SE 1 8 16 39 6 0 70 SSE 2 9 10 35 11 12 79 s 1 5 14 24 16 25 85 SSW 1 8 8 26 14 20 77 SW 1 6 13 15 3 0 38 WSW 0 4 10 8 10 4 36 w 0 2 10 12 10 6 40 WNW 2 1 9 33 17 4 66 NW 1 10 14 24 9 5 63 NNW 0 5 1.6 12 0 0 33 Variable 0 0 0 0 0 0 0 Total 10 74 176 317 111 77 765 Hours of calm in this class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 84 Page 70 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 5 13 9 1 0 28 NNE 0 3 8 8 2 0 21 NE 0 4 6 10 5 1 26 ENE 1 0 5 20 1 0 27 E 0 1 14 13 3 0 31 ESE 0 0 12 28 6 0 46 SE 1 3 25 11 2 0 42 SSE 0 1 21 29 16 5 72 s 0 2 23 44 37 16 122 SSW 0 3 6 40 17 5 71 SW 1 3 12 28 5 0 49 WSW 0 2 12 16 5 0 35 w 0 2 6 19 3 0 30 WNW 0 0 7 20 4 0 31 NW 1 6 14 16 2 0 39 NNW 0 8 14 8 0 0 30 Variable 0 0 0 0 0 0 0 Total 4 43 198 319 109 27 700 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: 84 Page 71 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 5 2 0 0 8 NNE 0 0 1 1 0 0 2 NE 0 3 0 3 0 0 6 ENE 0 2 7 5 0 0 14 E 0 4 2 0 0 0 6 ESE 0 1 5 2 1 0 9 SE 2 3 4 1 0 0 10 SSE 0 0 4 3 0 0 7 s 0 1 2 2 0 0 5 SSW 0 0 3 7 0 0 10 SW 1 2 3 2 0 0 8 WSW 0 3 1 5 0 0 9 w 0 1 4 2 0 0 7 WNW 1 1 8 5 0 0 15 NW 0 3 3 1 0 0 7 NNW 0 2 4 6 0 0 12 Variable 0 0 0 0 0 0 0 Total 4 27 56 47 1 0 135 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: 84 Page 72 of 112

Clinton Power Station Period of Record: April - June 2022 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 6 1 0 0 10 NNE 0 0 0 0 0 0 0 NE 1 1 3 4 0 0 9 ENE 0 2 5 2 0 0 9 E 1 4 7 1 0 0 13 ESE 0 0 0 3 0 0 3 SE 0 2 0 0 0 0 2 SSE 0 0 2 0 0 0 2 s 0 2 0 0 0 0 2 SSW 0 0 1 0 0 0 1 SW 0 1 0 0 0 0 1 WSW 0 2 1 0 0 0 3 w 0 1 2 2 0 0 5 WNW 0 3 0 0 0 0 3 NW 0 1 5 0 0 0 6 NNW 0 2 6 1 0 0 9 Variable 0 0 0 0 0 0 0 Total 3 23 38 14 0 0 78 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: 84 Page 73 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class Extremely Unstable 60m-10m Delta-T (Fl Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 5 1 0 0 12 NNE 0 3 7 0 0 0 10 NE 0 3 5 0 0 0 8 ENE 0 5 1 0 0 0 6 E 0 3 0 0 0 0 3 ESE 0 1 0 0 0 0 1 SE 0 3 0 0 0 0 3 SSE 0 4 0 0 0 0 4 s 0 3 21 0 0 0 24 SSW 0 6 24 2 0 0 32 SW 0 1 7 0 0 0 8 WSW 0 5 15 3 0 0 23 w 0 1 14 3 0 0 18 WNW 0 5 13 1 0 0 19 NW 0 3 13 3 0 0 19 NNW 1 3 3 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 1 55 128 13 0 0 197 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 Page 7 4 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Moderately Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 4 0 0 0 10 NNE 0 2 1 0 0 0 3 NE 0 3 7 0 0 0 10 ENE 0 2 0 0 0 0 2 E 0 3 0 0 0 0 3 ESE 0 6 0 0 0 0 6 SE 0 8 0 0 0 0 8 SSE 0 11 0 0 0 0 11 s 0 14 5 0 0 0 19 SSW 0 4 11 2 0 0 17 SW 0 0 5 1 0 0 6 WSW 0 2 2 0 0 0 4 w 0 4 2 0 0 0 6 WNW 0 4 4 0 0 0 8 NW 0 7 6 6 0 0 19 NNW 0 6 3 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 0 82 50 9 0 0 141 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 Page 75 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 4 0 0 0 8 NNE 0 3 2 0 0 0 5 NE 1 9 9 0 0 0 19 ENE 0 5 0 0 0 0 5 E 1 5 1 0 0 0 7 ESE 2 2 0 0 0 0 4 SE 0 8 1 0 0 0 9 SSE 0 14 0 0 0 0 14 s 0 17 8 0 0 0 25 SSW 0 5 11 0 0 0 16 SW 0 3 6 0 0 0 9 WSW 0 3 6 0 0 0 9 w 0 7 3 0 0 0 10 WNW 0 8 4 2 0 0 14 NW 1 7 5 5 0 0 18 NNW 0 4 1 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 5 104 61 7 0 0 177 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 Page 76 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Neutral - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind

  • Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 19 8 0 0 0 28 NNE 1 38 20 0 0 0 59 NE 4 44 33 0 0 0 Bl ENE 1 11 0 0 0 0 12 E 0 6 1 0 0 0 7 ESE 11 9 1 0 0 0 21 SE 12 18 3 0 0 0 33 SSE 13 37 5 0 0 0 55 s 6 39 16 0 0 0 61 SSW 2 20 34 3 0 0 59 SW 2 21 17 0 0 0 40 WSW 2 10 10 0 0 0 22 w 3 7 5 0 0 0 15 WNW 1 21 19 5 0 0 46 NW 1 26 15 3 0 0 45 NNW 4 15 2 0 0 0 21 Variable 0 0 0 0 0 0 0 Total 64 341 189 11 0 0 605 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 Page 77 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 17 3 0 0 0 22 NNE 8 21 3 0 0 0 32 NE 10 25 7 0 0 0 42 ENE 7 12 2 0 0 0 21 E 13 5 0 0 0 0 18 ESE 20 16 0 0 0 0 36 SE 16 21 0 0 0 0 37 SSE 13 36 2 0 0 0 51 s 9 86 22 0 0 0 117 SSW 3 41 34 1 0 0 79 SW 4 28 12 0 0 0 44 WSW 6 19 5 1 0 0 31 w 13 12 2 0 0 0 27 WNW 6 43 14 0 0 0 63 NW 4 20 8 0 0 0 32 NNW 4 18 4 0 0 0 26 Variable 0 0 0 0 0 0 0 Total 138 420 118 2 0 0 678 Hours of calm in this stability class: 1 Hours of wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 78 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 8 8 0 0 0 0 16 NNE 12 25 0 0 0 0 37 NE 14 27 0 0 0 0 41 ENE 6 3 0 0 0 0 9 E 5 0 0 0 0 0 5 ESE 9 0 0 0 0 0 9 SE 8 1 0 0 0 0 9 SSE 6 3 0 0 0 0 9 s 3 2 0 0 0 0 5 SSW 3 10 0 0 0 0 13 SW 11 7 0 0 0 0 18 WSW 5 10 0 0 0 0 15 w 5 1 0 0 0 0 6 WNW 9 12 0- 0 0 0 21 NW 5 22 0 0 0 0 27 NNW 4 2 0 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 113 133 0 0 0 0 246 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 Page 79 of 112

Clinton Power Station Period of Record: July - 2022 Stability Class - Stable Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 11 1 0 0 0 0 12 NNE 18 6 0 0 0 0 24 NE 18 27 0 0 0 0 45 ENE 5 1 0 0 0 0 6 E 4 0 0 0 0 0 4 ESE 1 0 0 0 0 0 1 SE 5 0 0 0 0 0 5 SSE 2 0 0 0 0 0 2 s 0 0 0 0 b 0 0 SSW 3 5 0 0 0 0 8 SW 2 1 0 0 0 0 3 WSW 6 0 0 0 0 0 6 w 5 0 0 0 0 0 5 WNW 9 0 0 0 0 0 9 NW 12 8 0 0 0 0 20 NNW 5 2 0 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 106 51 0 0 0 0 157 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: 3 Page 80 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Extremely Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 6 3 l 0 10 NNE 0 0 4 3 0 0 7 NE 0 2 7 3 0 0 12 ENE 0 2 5 0 0 0 7 E 0 2 0 0 0 0 2 ESE 0 0 2 0 0 0 2 SE 0 4 0 0 0 0 4 SSE 0 3 0 0 0 0 3 s 0 3 14 11 l 0 29 SSW 0 l 11 15 0 0 27 SW 0 0 5 3 0 0 8 WSW 0 3 5 13 l 0 22 w 0 0 5 11 0 0 16 WNW 0 3 6 9 2 0 20 NW 0 0 7 11 2 0 20 NNW l 2 l 4 0 0 8 Variable 0 0 0 0 0 0 0 Total l 25 78 86 7 0 197 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 Page 81 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class Moderately Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 8 2 0 0 11 NNE 0 1 1 0 0 0 2 NE 0 1 3 3 0 0 7 ENE 0 2 2 2 0 0 6 E 0 2 1 0 0 0 3 ESE 0 3 2 0 0 0 5 SE 0 10 1 0 0 0 11 SSE 0 8 3 0 0 0 11 s 0 7 6 4 0 0 17 SSW 0 1 9 5 2 0 17 SW 0 0 2 3 0 0 5 WSW 0 1 2 1 1 0 5 w 0 3 3 1 0 0 7 WNW 0 2 3 2 0 0 7 NW 0 3 4 5 6 0 18 NNW 0 4 2 2 1 0 9 Variable 0 0 0 0 0 0 0 Total 0 49 52 30 10 0 141 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 Page 82 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 5 2 0 0 7 NNE 0 2 2 0 0 0 4 NE 0 2 8 7 0 0 17 ENE 0 4 3 1 0 0 8 E 0 6 1 0 0 0 7 ESE 0 4 1 0 1 0 6 SE 0 8 1 0 0 0 9 SSE 0 12 2 1 0 0 15 s 0 9 8 6 1 0 24 SSW 0 4 6 6 0 0 16 SW 0 1 7 1 0 0 9 WSW 0 3 3 4 0 0 10 w 0 1 3 3 0 0 7 WNW 0 3 6 3 2 0 14 NW 0 4 5 4 3 1 17 NNW 0 4 2 1 0 0 7 Variable 0 0 0 0 0 0 0 Total 0 67 63 39 7 1 177 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 Page 83 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Neutral - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 8 14 6 0 0 28 NNE 0 8 23 4 0 0 35 NE 2 7 52 27 0 0 88 ENE 1 4 19 4 0 0 28 E 1 6 3 2 0 0 12 ESE 1 9 2 2 0 0 14 SE 6 21 11 4 0 0 42 SSE 3 23 13 6 0 0 45 s 2 16 35 10 0 0 63 SSW 1 6 22 29 4 0 62 SW 1 8 19 11 0 0 39 WSW 1 3 11 8 0 0 23 w 0 5 7 4 0 0 16 WNW 0 6 16 14 6 1 43 NW 1 10 11 15 3 0 40 NNW 3 6 16 1 1 0 27 Variable 0 0 0 0 0 0 0 Total 23 146 274 147 14 1 605 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 Page 84 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Slightly Stable - 60m-10m Delta-T ( F)

Winds Measured at 60 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 4 16 9 0 0 29 NNE 0 5 7 1 0 0 13 NE 0 3 13 22 0 0 38 ENE 0 4 17 9 2 0 32 E 1 6 8 7 0 0 22 ESE 0 7 7 5 0 0 19 SE 1 15 23 1 0 0 40 SSE 1 22 33 11 1 0 68 s 1 19 65 46 2 0 133 SSW 1 4 21 32 4 0 62 SW 0 6 16 27 2 0 51 WSW 0 1 14 8 3 0 26 w 0 5 16 6 1 0 28 WNW 1 5 16 30 1 0 53 NW 1 4 11 23 0 0 39 NNW 0 5 16 5 0 0 26 Variable 0 0 0 0 0 0 0 Total 7 115 299 242 16 0 679 Hours of calm in this stability class: 0 Hours of wind measurements in this stability class: 0 Hours of stability measurements in all stability classes: 3 Page 85 of 112

Clinton Power Station Period of Record: July - 2022 Class - Stable Delta-T (F)

Winds Measured at 60 Meters Wind Speed ,(in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 3 2 0 0 8 NNE 0 3 9 9 0 0 21 NE 1 4 13 26 1 0 45 ENE 0 0 8 4 0 0 12 E 0 1 21 3 0 0 25 ESE 0 2 4 0 0 0 6 SE 0 7 4 0 0 0 11 SSE 2 4 6 0 0 0 12 s 0 4 5 0 0 0 9 SSW 0 3 5 2 0 0 10 SW 0 2 7 6 0 0 15 WSW 0 0 7 8 0 0 15 w 1 0 5 4 0 0 10 WNW 0 0 7 1 0 0 8 NW 0 1 12 2 0 0 15 NNW 0 5 10 10 0 0 25 Variable 0 0 0 0 0 0 0 Total 5 38 126 77 1 0 247 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing measurements in all stability classes: 3 Page 86 of 112

Clinton Power Station Period of Record: July - September 2022 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 5 3 0 0 0 9 NNE 1 2 3 2 0 0 8 NE 0 4 6 7 0 0 17 ENE 1 4 7 9 0 0 21 E 2 5 15 6 0 0 28 ESE 3 2 2 3 0 0 10 SE 1 7 0 0 0 0 8 SSE 2 1 4 0 0 0 7 s 1 5 2 0 0 0 8 SSW 0 3 0 0 0 0 3 SW 0 0 1 6 0 0 7 WSW 0 0 3 0 0 0 3 w 1 7 3 0 0 0 11 WNW 1 2 0 0 0 0 3 NW 2 0 0 0 0 0 2 NNW 0 0 12 2 0 0 14 Variable 0 0 0 0 0 0 0 Total 16 47 61 35 0 0 159 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 Page 87 of 112

Clinton Power Station Period of Record: October December2022 Stability Class - Extremely Unstable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 0 0 0 4 NNE 0 0 2 0 0 0 2 NE 0 1 6 0 0 0 7 ENE 0 3 0 0 0 0 3 E 0 1 1 0 0 0 2 ESE 0 0 0 0 0 0 0 SE 0 2 0 0 0 0 2 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 1 0 0 1 w 0 0 0 3 0 0 3 WNW 0 0 3 4 0 0 7 NW 0 0 0 11 0 0 11 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 7 17 19 0 0 43 Hours of calm in this stability class: 0 Hours of wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 Page 88 of 112

Clinton Power Station Period of Record: October December2022 Stability Class - Moderately Unstable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 l 1 0 0 0 2 NNE 0 0 3 0 0 0 3 NE 0 1 5 0 0 0 6 ENE 0 2 1 0 0 0 3 E 0 2 0 0 0 0 2 ESE 0 0 4 0 0 0 4 SE 0 2 0 0 0 0 2 SSE 0 0 2 0 0 0 2 s 0 1 3 0 0 0 4 SSW 0 0 1 2 0 0 3 SW 0 3 9 2 0 0 14 WSW 0 0 3 2 0 0 5 w 0 2 9 5 4 0 20 WNW 0 0 2 6 2 0 10 NW 0 0 4 7 0 0 11 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 14 49 25 6 0 94 Hours of calm in this stability class: 0 Hours of missing wind measurements in this class: 0 Hours of stability measurements in all stability classes: 0 Page 89 of 112

Clinton Power Station Period of Record: October - Decernber2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters 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 1 0 0 0 1 NE 0 1 1 0 0 0 2 ENE 0 4 2 0 0 0 6 E 0 0 4 0 0 0 4 ESE 0 0 0 0 0 0 0 SE 0 2 0 0 0 0 2 SSE 0 2 1 0 0 0 3 s 0 4 7 3 0 0 14 SSW 0 3 7 4 0 0 14 SW 0 1 10 3 0 0 14 WSW 0 2 3 4 1 0 10 w 0 1 2 7 1 2 13 WNW 0 1 4 0 5 1 11 NW 0 5 1 5 0 0 11 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 26 43 26 7 3 105 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 Page 90 of 112

Clinton Power Station Period of Record: October - Decernber2022 Stability Class Neutral - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 4 19 9 5 0 0 37 NNE 1 12 8 3 0 0 24 NE 1 23 6 0 1 0 31 ENE 1 16 17 0 0 0 34 E 2 14 14 0 0 0 30 ESE 4 29 23 2 0 0 58 SE 0 25 5 0 0 0 30 SSE 3 18 24 6 2 0 53 s 2 15 53 45 3 0 118 SSW 5 13 20 20 14 0 72 SW 2 9 33 12 7 0 63 WSW 1 4 25 26 0 0 56 w 3 2 29 56 13 5 108 WNW 0 16 43 47 29 2 137 NW 0 20 30 25 7 0 82 NNW 1 15 18 5 0 0 39 Variable 0 0 0 0 0 0 0 Total 30 250 357 252 76 7 972 Hours of calm in this stabi class: 0 Hours of missing wind measurements in this 0 Hours of missing stability measurements in classes: 0 Page 91 of 112

Clinton Power Station Period of Record: October December2022 Stability Class Stable 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 6 10 8 0 0 0 24 NNE 2 11 5 1 0 0 19 NE 4 21 3 1 0 0 29 ENE 3 11 9 0 0 0 23 E 6 19 7 0 0 0 32 ESE 3 17 5 0 0 0 25 SE 6 21 7 0 0 0 34 SSE 1 45 42 1 0 0 89 s 4 31 78 29 1 0 143 SSW 1 10 36 13 6 0 66 SW 1 20 8 1 0 0 30 WSW 1 18 15 1 0 0 35 w 4 23 9 2 0 0 38 WNW 3 21 31 2 0 0 57 NW 6 15 20 0 0 0 41 NNW 5 9 6 0 0 0 20 Variable 0 0 0 0 0 0 0 Total 56 302 289 51 7 0 705 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing measurements in all stability classes: 0 Page 92 of 112

Clinton Power Station Period of Record: October - Decernber2022 Stability Class - Moderately Stable - 60m-10m Delta-T (F)

Winds Measured at 10 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 11 1 0 0 0 12 NE 4 18 0 0 0 0 22 ENE 3 2 0 0 0 0 5 E 0 3 0 0 0 0 3 ESE 5 2 0 0 0 0 7 SE 0 7 0 0 0 0 7 SSE 1 12 3 0 0 0 16 s 5 10 3 0 0 0 18 SSW 1 19 4 0 0 0 24 SW 6 9 0 0 0 0 15 WSW 1 13 0 0 0 0 14 w 0 6 0 0 0 0 6 WNW 0 2 0 0 0 0 2 NW 0 5 0 0 0 0 5 NNW 2 3 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 28 123 11 0 0 0 162 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 Page 93 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Stable 60m-10m Delta-T (F)

Winds Measured at 10 Meters 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 5 2 0 0 0 0 7 NE 8 31 0 0 0 0 39 ENE 5 2 0 0 0 0 7 E 2 0 0 0 0 0 2 ESE 2 0 0 0 0 0 2 SE 2 1 0 0 0 0 3 SSE 5 2 0 0 0 0 7 s 6 4 0 0 0 0 10 SSW 8 13 0 0 0 0 21 SW 2 5 0 0 0 0 7 WSW 5 2 0 0 0 0 7 w 2 0 0 0 0 0 2 WNW 2 0 0 0 0 0 2 NW 6 1 0 0 0 0 7 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 64 63 0 0 0 0 127 Hours of calm in this class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stabi measurements in all stability classes: 0 Page 94 of 112

Clinton Power Station Period of Record: October December2022 Class - Unstable 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 0 0 0 4 NNE 0 0 1 1 0 0 2 NE 0 0 1 6 0 0 7 ENE 0 0 3 0 0 0 3 E 0 0 1 0 0 0 1 ESE 0 0 0 1 0 0 1 SE 0 0 2 0 0 0 2 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 1 0 0 1 w 0 0 0 2 1 0 3 WNW 0 0 1 3 3 0 7 NW 0 0 0 2 9 0 11 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 0 13 17 13 0 43 Hours of calm in this class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing measurements in all stability classes: 0 Page 95 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Moderately Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 0

-NNE 0 0 1 2 0 3 NE 0 1 2 3 0 0 6 ENE 0 1 2 1 0 0 4 E 0 0 1 1 0 0 2 ESE 0 0 0 3 0 0 3 SE 0 0 2 0 0 0 2 SSE 0 0 2 0 0 0 2 s 0 0 3 1 0 0 4 SSW 0 0 1 2 0 0 3 SW 0 1 6 6 0 0 13 WSW 0 0 2 5 0 0 7 w 0 0 4 8 2 4 18 WNW 0 0 1 4 2 3 10 NW 0 0 2 3 7 0 12 NNW 0 1 2 0 1 0 4 Variable 0 0 0 0 0 0 0 Total 0 4 31 40 12 7 94 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 Page 96 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Slightly Unstable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters 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 1 0 0 0 1 NE 0 0 1 0 0 0 1 ENE 0 1 3 1 0 0 5 E 0 1 0 4 0 0 5 ESE 0 0 0 1 0 0 1 SE 0 1 1 0 0 0 2 SSE 0 0 2 1 0 0 3 s 0 3 2 5 2 2 14 SSW 0 1 5 7 0 0 13 SW 0 2 5 7 1 0 15 WSW 0 0 2 6 1 1 10 w 0 0 1 2 3 4 10 WNW 0 1 2 3 2 6 14 NW 0 4 0 1 5 0 10 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 15 25 38 14 13 105 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 Page 97 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Neutral - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 9 15 5 2 1 33 NNE 2 9 4 7 1 0 23 NE 0 6 11 3 0 3 23 ENE. 0 5 15 17 1 0 38 E 0 8 6 14 1 0 29 ESE 0 7 26 13 16 2 64 SE 1 14 14 3 3 0 35 SSE 2 8 11 13 10 8 52 s 1 8 20 21 50 28 128 SSW 1 5 17 14 6 13 56 SW 2 3 13 29 12 7 66 WSW 2 2 6 23 24 2 59 w 1 1 5 36 34 22 99 WNW 1 5 13 33 31 49 132 NW 0 8 16 19 29 11 83 NNW 0 7 14 19 11 1 52 Variable 0 0 0 0 0 0 0 Total 14 105 206 269 231 147 972 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 Page 98 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Slightly Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 6 6 10 2 0 25 NNE 1 4 6 7 0 1 19 NE 0 3 8 6 1 0 18 ENE 3 3 9 4 7 0 26 E 1 2 7 14 3 0 27 ESE 0 5 9 13 2 0 29 SE 3 11 18 8 1 0 41 SSE 1 5 19 36 26 1 88 s 1 5 12 64 42 28 152 SSW 0 2 8 31 17 6 64 SW 0 2 9 7 1 0 19 WSW 0 2 11 24 1 0 38 w 0 2 15 19 2 0 38 WNW 1 4 16 32 4 0 57 NW 2 0 10 16 6 0 34 NNW 0 5 13 12 0 0 30 Variable 0 0 0 0 0 0 0 Total 14 61 176 303 115 36 705 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 Page 99 of 112

Clinton Power Station Period of Record: October - December2022 Stability Class - Moderately Stable 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind {in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 2 2 0 0 4 NNE 0 0 1 1 0 0 2 NE 0 1 1 20 4 0 26 ENE 0 0 1 2 0 0 3 E 0 0 6 0 0 0 6 ESE 1 0 2 0 0 0 3 SE 2 2 4 0 0 0 8 SSE 0 1 1 7 0 0 9 s 0 0 6 16 1 0 23 SSW 0 1 5 5 1 0 12 SW 0 1 6 19 1 0 27 WSW 0 1 5 12 0 0 18 w 0 0 3 8 0 0 11 WNW 0 0 3 0 0 0 3 NW 0 0 2 2 0 0 4 NNW 0 0 3 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 3 7 51 94 7 0 162 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 Page 100 of 112

Clinton Power Station Period of Record: October - Decernber2022 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 60 Meters Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 0 2 0 0 0 3 NNE 0 0 2 0 0 0 2 NE 0 0 1 0 1 0 2 ENE 1 1 3 0 0 0 5 E 0 1 7 23 0 0 31 ESE 0 1 6 5 0 0 12 SE 0 2 6 0 0 0 8 SSE 1 0 1 2 0 0 4 s 0 0 3 0 0 0 3 SSW 0 1 9 2 0 0 12 SW 0 1 11 13 0 0 25 WSW 0 2 5 6 0 0 13 w 0 0 3 1 0 0 4 WNW 0 0 3 0 0 0 3 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 3 9 62 52 1 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 Page 101 of 112

SECTION 8 ODCM OPERATIONAL REMEDIAL REQUIREMENT REPORT In accordance with CPS ODCM 3.1.1 Action G.1, 3.2.1 Action F.1, and 3.2.2 Action G.1; NON-FUNCTIONAL radioactive liquid and gaseous effluent monitoring instrumentation channels remaining in a NON-FUNCTIONAL condition for greater than the designated time shall be reported in the Annual Radioactive Effluent Release Report. During the course of 2022, there were zero (0) instances where a radioactive liquid or gaseous effluent monitoring instrumentation channel remained in a NON-FUNCTIONAL condition for greater than the designated clock requirement.

Throughout 2022, there was zero (O) instances of missed ODCM required samples and zero (O) instances of delayed ODCM required sampling.

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SECTION 9 CHANGES TO RADIOACTIVE WASTE TREATMENT SYSTEMS In accordance with Section 6.2 of the CPS ODCM, licensee-initiated changes to the liquid, gaseous or solid radioactive waste treatment systems shall be reported in the Annual Radioactive Effluent Release Report.

There were no permanent changes to the Radioactive Waste Treatment Systems during the course of the 2022 reporting period; therefore, there is no documentation required in the 2022 Annual Radioactive Effluent Release Report.

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SECTION 10 NEW LOCATIONS FOR DOSE CALCULATION AND/OR ENVIRONMENTAL MONITORING The following is a summary of the 2022 Annual Land Use Census. It shows changes in locations for dose calculations and/or environmental monitoring identified by the Annual Land Use Census. The distance of the receptor is being listed in the report in lieu of the name of the resident. This is being done to maintain and respect the privacy of the residents.

1.0 Nearest Residents TABLE 19 Nearest Residence The nearest residents identified in each of the sixteen (16) sectors are shown below.

2022 RESIDENT 2021 RESIDENT SECTOR AGE GROUP AGEGROUP

{km) (km)

N 1.50 A 1.50 A NNE 1.50 A 1.50 A NE 2.07 A 2.07 A ENE 2.86 C/A* 2.86 A E 1.67 A 1.67 A ESE 5.14 A 5.14 A SE 4.44 C/A 4.44* C/A SSE 2.90 A 2.90 A s 4.78 A 4.78 A.

SSW 4.68 A 4.68 A SW 1.17 A 1.17 A WSW 3.62 A 3.62 A w 1.95 T/A 1.95 T/A WNW 2.63 A 2.63 A NW 2.65 A 2.65 A NNW 2.05 A 2.05 A

  • Indicates any changes from the previous year (l)nfant (C)hild (T)een (A)dult Page 104 of 112

2.0 Broadleaf Garden Census

  • Fifty-eight (58) gardens within a five (S) kilometer radius were located in the sixteen (16) geographical sectors surrounding CPS. Eighteen (18) gardens contained broad leaf vegetation, which were specifically identified for this report. Although other crops were identified within these areas, they are not addressed as part of this report.

The nearest gardens greater than fifty (SO) square-meters and producing broadleaf vegetation identified in each of the sixteen (16) geographical sectors are shown below.

TABLE 20 Nearest Broadleaf Garden 2022 GARDENS 2021 GARDENS SECTOR AGE GROUPS AGE GROUPS (km) (km)

N 1.50 A 1.50 A NNE 4.78 A 4.78* A*

NE >8* 3.46 A ENE 4.35* C/A 3.45* C/A*

E 1.67* A* 3.95* C/T/A ESE >8 >8 SE >8 >8 SSE 4.32* C/T/A* 4.45* C/A*

s >8 >8 SSW >8 >8 SW 5.61* A* >8*

WSW 3.66 A 3.66 A w >8* 3.22* A*

WNW 2.63 A 2.63* A*

NW 4.70 C/A 4.70* C/A*

NNW 2.05 A 2.05 A

  • Indicates any changes from the previous year (l)nfant (C)hild (T)een (A)dult Page 105 of 112

3.0 Milking Animal Census Milking animals within the sixteen (16) geographical sectors were located within five (5) miles surrounding CPS. These milking animals were either used for the nursing of the animal's offspring or used for meat production for the resident's own personal use and sold commercially. There were no residents that milked their animals for human consumption.

Milking animals were specifically identified for this report. Although other livestock were identified within these areas, they are not addressed as part of this report.

The nearest milking animals identified in each of the sixteen (16) geographical sectors are shown below.

TABLE 21 Nearest Milking Animal 2022 MILKING 2021 MILKING ANIMALS SECiOR AGE GROUPS AGE GROUPS ANIMALS (km) (km)

N 1.50 A 1.50 A NNE >8 >8 NE >8 >8 ENE >8 >8 E >8 >8 ESE >8 >8 SE >8 >8 SSE >8 >8 s >8 >8*

SSW >8 >8 SW >8 >8 WSW 4.32 A/T 4.32 A/T w >8 >8*

WNW >8 >8 NW >8 >8 NNW 2.05 A 2.05 A

  • Indicates any changes from the previous year (l)nfant (C)hild {T)een (A)dult Page 106 of 112

SECTION 11 CORRECTIONS TO DATA REPORTED IN PREVIOUS REPORTS There were administrative changes identified against a previously submitted Annual Radioactive Effluent Release Report resulting in errata data submittal to the Commision. IR 04532028 and 04543917 were generated on October 25, 2022 and December 20, 2022.

In the 2021 ARERR report, the calculation of the maximum annual radiation dose delivered to the inhabitants of the area surrounding CPS was over-convservative. The calculation consisted of incorrectly adding beta air and gamma air dose to the organ, skin, and total body dose; giving an over-conservative result of 3.37E-02 mRem. The correct value of 3.13E-02 mRem and corresponding fraction of the limit (2.09E-01%) were updated in the below 2021 Section 1 Executive Summary.

A calculation error was identified in Table 1 Section A.2 for the average release rate for the period. The reported average release rate for Quarter 3 was calculated assuming 91 days in the quarter.

However, there are 92 days in Quarter 3. The 2021 reported average release rate of 6.79E-01. uCi/s has been updated to the correct value of 6.71E-01 uCi/s. Although the values are not identical, the percent difference of 1.18% does not pose a significant impact on the release rate for the period.

A calculation error was identified in Table lA for Doses per Quarter (Quarters 3 and 4) and the Doses per Year. The Doses per Quarter (Quarters 3 and 4) were incorrectly calculated using the dose for the maximum dose receptor rather than air dose "to areas at and beyond the SITE BOUNDARY" as indicated by CPS ODCM 3.4.2.1. Quarter 3 and Quarter 4 Doses per Quarter were updated and% of Limit was recalculated using the air dose at the site boundary. These updated values were then used to calculate the Doses per Year and corresponding% of limit.

A transcriptional error was identified in Table 1B for bone dose and fraction of the limit. The reported dose and corresponding fraction of the limit was 3.llE-02 mRem and 2.07E-01%. The correct dose of 3.13E-02 mRem and fraction of 2.09E-01% were updated accordingly. Another transcriptional error was identified in Table 2 Section C for the total particulates released during Quarter 2. The reported total value of 6.61E-05 Ci was not updated from the previous year and the table has been updated to include the correct value of 2.32E-06 Ci. Although this value was not updated, it did not impact any dose calculations for the period. Another transcriptional error was identified in Table 2 Section F for the total Carbon-14 released in Quarter 4. The reported value of 2.84E+00 is incorrect and the table has been updated to include the correct value of 2.89E+00 Ci. Although the 2021 reported value is not correct, the percent difference of 1.73% between the reported and actual dose does not pose a significant impact on dose for the period.

For clarification to Compliance with 40CFR190 Requirements located in Section 1, the doses corresponding to the 40CFR1S)0 total body, organ, and thyroid limits were added. These doses were updated and reported, respectively, as 3.49E-03 mRem, 3.13E-02 mRem, and 6.05E-04 mRem.

UPDATED 2021 SECTION 1 EXECUTIVE

SUMMARY

The Annual Radioactive Effluent Release Report (ARERR) is a detailed description of gaseous and liquid radioactive effluents released from Clinton Power Station (CPS) and the resulting radiation doses for the period of January 01, 2021 through December 31, 2021. This Page 107 of 112

report also includes a detailed meteorological section providing weather history of the surrounding area during this period. The information in the ARERR is used to calculate the offsite dose to our public.

The repor~ also includes a summary of the amounts of radioactive material contained in solid waste that is packaged and shipped to a federally approved disposal/burial facility offsite.

Additionally, this report notifies the U.S. Nuclear Regulatory Commission (NRC) staff of changes to CPS's Offsite Dose Calculation Manual (ODCM), as well as exceptions to the CPS effluent monitoring program and a summary of events that must be reported in accordance with ODCM Section 6.2.

The NRC requires that nuclear power facilities be designed, constructed and operated in such a manner as to maintain radioactive effluent releases to unrestricted areas 8s !,,ow As

.B,easonably Achievable (ALARA). To ensure compliance with this criterion, the NRC has established limitations governing the release of radioactivity in effluents.

During 2021, CPS operations were well within these federally required limits. The maximum annual radiation dose delivered to the inhabitants of the area surrounding CPS, due to radioactivity released from the station, was 3.13E-02 mRem (millirem). The radiation dose to the public in the vicinity of CPS was calculated by using the concentration of radioactive nuclides from each gaseous effluent release coupled with historical weather conditions. The dose from CPS gaseous radioactive effluents is only a small fraction of the limit (2.09E-01%) for the maximum exposed member of the public. There were no liquid effluent releases in 2021.

As such, there was no dose received by the public from the liquid radioactive effluent pathway.

UPDATED 2021 TABLE 1 Gaseous Effluents - Summation Of All Releases Data Period: January 01, 2021 - December 31, 2021 Continuous Mixed Mode Units Quarter 1 Quarter 2 I Quarter 3 Quarter 4 Est. Total Error,%

A. Fission & Activation Gases

1. Total Release Ci 2.84E+0O 2.21E+00 5.34E+00 2.68E+0O 3.00E+0l
2. Average release rate

µCi/sec for period 3.65E-01 2.82E-01 6.71E-01 3.37E 0 01

3. Percent of ODCM Limit * * *
1. Total lodine-131 Ci 0.00E+00 0.00E+00 0.00E+O0 0.00E+00 3.10E+01
2. Average release rate

µCi/sec for period 0.00E+0O 0.00E+00 0.0E+00 0.0E+00

3. Percent of ODCM Limit * * * *
c. Particulates
1. Particulates with Ci 2.40E+01 half-lives >8 days 5.53E-06 2.32E-06 1.45E-05 9.03E-05
2. Average release rate

µCi/sec for period 7.llE-07 2.95E-07 1.85E-06 1.14E-05 Page 108 of 112

3. Percent of ODCM Limit * * *
1. Total Release Ci 7.42E+00 7.56E+0O 6.28E+00 S.82E+00 2.10E+01
2. Average release rate

µCi/sec for period 9.54E-01 9.62E-01 7.99E-01 7.32E-01

3. Percent of ODCM Limit * * *
  • E. Gross Alpha
1. Total Release Ci <LLD <LLD <LLD <LLD
2. Average release rate

µCi/sec 0.00E+00 0.00E+00 0.00E+00 0.00E+00 for period F. Carbon-14

1. Total Release Ci 4.llE+00 4.31E+00 4.10E+00 2.89E+00
2. Average. release

µCi/sec 5.28E-01 S.48E-01 5.22E-01 3.57E-01 Rate for period

  • Applicable limits are expressed in terms of dose. See Tables 1A and 1B of this report.

UPDATED 2021 TABLE 1A Air Doses Due to Gaseous Releases Doses per Quarter (mRad)

Type of ODCM znd 3rd pt Quarter  % of Limit  % of Limit  % of Limit 4th Quarter  % of Limit Radiation Limit Quarter Quarter 5

Gamma 1.31E-04 2.62E-03 1.02E-04 2.04E-03 7.39E-04 1.48E-02 4.92E-04 9.84E-03 mRad 10 Beta 4.63E-0S 4.63E-04 3.61E-0S 3.61E-04 3.19E-04 3.19E-03 1.74E-04 1.74E-03 mRad Doses per Year (mRad)

Type of Radiation ODCM Limit Vear  % of Limit Gamma 10 mRad 1.46E-03 1.46E-02 Beta 20 mRad S.75E-04 2.88E-03 UPDATED 2021 TABLE 1B Doses to a Member of the Public Due to Radioiodines, Tritium, Carbon-14, and Particulates in Gaseous Release Doses per Quarter (mRem)

ODCM pt  % of znd  % of 3rd  % of 4tli  % of Organ Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Bone 7.5 mRem 8.33E-03 1.llE-01 8.71E-03 1.16E-01 8.30E-03 1.llE-01 5.68F03 7.57E-02 Liver 7.5 mRem 1.22E-04 1.63E-03 1.78E-04 2.37E-03 1.59E-04 2.12E-03 1.51E-04 2.01E-03 TBody 7.5 mRem 1.79E-03 2.39E-02 1.97E-03 2.63E-02 1.82E-03 2.43E-02 1.33E-03 1.77E-02 Thyroid 7.5 mRem 1.22E-04 1.63E-03 1.78E-04 2.37E-03 1.58E-04 2.11E-03 1.47E-04 1.96E-03 Kidney 7.5 mRem 1.22E-04 1.63E-03 1.78E-04 2.37E-03 1.58E-04 2.11E-03 1.48E-04 1.97E-03 Page 109 of 112

Lung 7.5 mRem 1.22E-O4 1.63E-O3 1.78E-O4 2.37E-O3 1.58E-O4 2.llE-O3 1.47E-O4 1.96E-O3 GI LU 7.5 mRem 1.22E-O4 1.63E-O3 1.78E-O4 2.37E-O3 1.59E-O4 2.12E-O3 1.51E-O4 2.OlE-O3 Doses per Year {mRem)

Type of Organ ODCM Limit Dose  % of Limit Bone 15 mRem 3.13E-O2 2.O9E-O1 Liver 15 mRem 6.llE-O4 4.O7E-O3 TBody 15 mRem 6.92E-O3 4.61E-O2 Thyroid 15 mRem 6.O5E-O4 4.O3FO3 Kidney 15 mRem 6.O7E-O4 4.O5E-O3 Lung 15 mRem 6.OGE-O4 4.O4E-O3 GILLI 15 mRem 6.lOE-O4 4.O7E-O3 UPDATED 2021 TABLE 2 Gaseous Effluents - Nuclides Released Clinton Power Station YEAR: 2021 Mixed Mode Release X Elevated Release I Continuous Mode Ground-Level Release Batch Mo~e Units Quarter 1111 Quarter 2£11 Quarter 3111 Quarter 4lll A. Fission Gases xe13s Ci <LLD <LLD 1.66E+OO <LLD KrBSm Ci <LLD <LLD <LLD <LLD xe133 Ci <LLD <LLD <LLD <LLD Kr8s Ci <LLD <LLD <LLD <LLD Ar41 Ci 2.84E+OO 2.21E+OO 3.68E+OO 2.68E+OO Total for Period Ci 2.84E+OO 2.21E+OO 5.34E+OO 2.68E+OO B. Iodines

,131 Ci <LLD <LLD <LLD <LLD 1133 Ci <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD <LLD C. Particulates Co6o Ci 5.53E-O6 2.32E-O6 <LLD <LLD y9lm [iJ Ci <LLD <LLD <LLD <LLD Nbgs Ci <LLD <LLD <LLD <LLD ce141 Ci <LLD <LLD <LLD <LLD crs1 Ci <LLD <LLD <LLD <LLD Mns4 Ci <LLD <LLD 1.45E-O5 9.O3E-O5 24 Ci <LLD <LLD <LLD <LLD Na 121 cd109 Ci <LLD <LLD <LLD <LLD Cs13sl2J Ci <LLD <LLD <LLD <LLD Coss Ci <LLD <LLD <LLD <LLD

  • zn65 Ci <LLD <LLD <LLD <LLD Total for Period Ci S.53E-O6 2.32E-O6 1.4SE-O5 9.O3E-O5 Page 110 of 112

D. Gross Alpha Gross Alpha I Ci I <LLD I <LLD I <LLD I <LLD E. Tritium Total for Period I Ci I 7.42E+00 I 7.56E+00 I 6.28E+00 I 5.82E+00 F. Carbon-14 Total for Period I Ci I 4.llE+00 I 4.31E+00 I 4.10E+00 I 2.89E+00 UPDATED 2021 COMPLIANCE WITH 40CFR190 REQUIREMENTS Dosimeter of Legal Records (DLRs) are stationed around CPS to measure the ambient gamma radiation field. Monitoring stations are placed near the site boundary, which includes the Independent Spent Fuel Storage Installation (ISFSI) pad, and approximately five (5) miles from the reactor, in locations representing the sixteen (16) compass sectors. Other locations are chosen to measure the radiation field at places of special interest such as nearby residences, meeting places and population centers. Control sites are located further than ten (10) miles from the site, in areas that should not be affected by plant operations. The results from the field dosimeters are reported in the Annual Radiological Environmental Operating Report (AREOR) and indicated no excess dose to offsite areas. The organ and whole body doses reported in the above tables are determined using 10CFR50 Appendix I methodology, which encompasses the limits of 40CFR190. The requirement requires the preparation and su.bmittal of a Special Report whenever the calculated doses from plant generated radioactive effluents and direct radiation exceed 25 mRem to the total body or any organ, except the thyroid, which shall be limited to less than or equal to 75 mRem. During 2021, Clinton Power Station operated at 1.40E-02% of the 40CFR190 total body limit (3.49e-03 mRem), 1.25E-01% of the 40CFR190 organ limit (3.13E-02 mRem) and 8.07E-04% 40CFR190 thyroid limit (6.05E-04 mRem).

Page 111 of 112

SECTION 12 CHANGES TO THE OFFSITE DOSE CALCULATION MANUAL The Offsite Dose Calculation Manual (ODCM) was revised in 2022.

Licensee initiated changes to the ODCM are still performed in accordance with Technical Specification 5.5.1, Offsite Dose Calculation Manual {ODCM) and are still reviewed per procedure and Plant Oversight Review Committee (PORC) process and approval of the Plant Manager.

Revision (26) of the ODCM is included with this submittal with Revision bars and date of change reflected as required.

Page 112 of 112

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