Text

Annual Radioactive Effluent Release Report
	ML21187A027
Person / Time
Site:	Clinton
Issue date:	04/21/2021
From:	Plumey N; Exelon Generation Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	U-604627
	Download: ML21187A027 (109)
	v • d • e

,*

2

>* Exelon Generation© Clinton Power Station 8401 Power Road Clinton, IL 61727 U-604627 10 CFR 50.36a April 21, 2021 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Clinton Power Station, Unit 1 Facility Operating License No. NPF-62 NRC Docket No. 50-461

Subject:

Clinton Power Station 2020 Annual Radioactive Effluent Release Report Exelon Generating Company, LLC (Exelon), Clinton Power Station is submitting the 2019 Annual Radioactive Effluent Release Report. This report is submitted in accordance with Technical Specification requirement 5.6.3, "Radioactive Effluent Release Report," and covers the period from January 1, 2020, through December 31, 2020.

There are no regulatory commitments contained in this report.

Questions on this letter may be directed to Ms. Melissa Dean, Chemistry Manager, at 217-937-3200.

Respectfully,

{Mi2; Norha PlumJ Plant Manager Clinton Power Station

Attachment:

Radioactive Effluent Release Report cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - Clinton Power Station Office of Nuclear Facility Safety - Illinois Emergency Management Agency

..,.,, ExelonGeneration.

January 01, 2020 - December 31, 2020 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT CLINTON POWER STATION - DOCKET NUMBER 50-461 Prepared by :

Briana Rathbun Clinton Power Station Page 1 of 108

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 Assessm'ents 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, .P.revious Reports 105

'i2 Changes to the Offsite Dose Calculation Manual 108 Page 2 of 108

LIST OF :rABLl;S 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;!, t9 Radioiodiri-es, 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 ~II 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 Comm'itme'nts 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 withiw 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 Boun'dary 16 Meteorological Data Availability 44 17 Classification of Atmospheric Stability 45 18 Joint Wind Frequency Distribution by Stability Class 46 Page 3 of 108

19 Nearest Residence 104 20 Nearest Broadleaf Garden 105 21 Nearest Milking Animal 106 Page 4 of 108

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 108

SECTION 1 EXECUTIVE

SUMMARY

The Annual Radioactive Effluent Release Report (AR ERR) is a detailed* description of gaseous and liquid radioactive effluents released from Clinton Power Statio'n (CPS) and the re:iulting radiation doses for the period of January 01, 2020 through December 31, 2020. This report also includes a detailed meteorological section providing weather history of the surrounding area du'ring 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 exc*eptions 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

.s,uch a manner as to maintain radioactive effluent releases to unrestricted areas A_s !,_ow 6s Reasonably 6chievable (ALARA). To ensure complia*nce with this criterion, the NRC has established limitations governing the release of radioactivity in effluents.*

During 2020, 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 3.92E-02 mRem (millirem). The* r'adiation 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 {2.6iE-01%) for the maximum exposed member of the public. There were no liquid effluent releases in 2020.

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

Page 6 of 108

.SECTION-2 INTRODUCTION CPS is loq1ted in Harp Township, DeWitt Countv:*approximately six miles east of the city of Clinton in east-central Illinois. CPS is a "'.l,140 111egawa.tt gross *electrical power:,.output boiling water rea,ctor. Initial fu~l-load commence(:! in.Septen,ber of 1986 with initial criticalit,yaof the reactor occurring ,on Februa,ry 27, 1987. Commerc;ial. ,operation commenced in April 1987 and the reactor reached 100% poVl(er for the first time on Sept.ember 15, 19.8.7.

CPS releases airborne effluents via two gaseous effluent 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.i~ continuous,ly, 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 2020 at CPS. Each release would have been sampled and

,analy,ze_d p,rior to release if this were to occur. Depending upon the amount of activity in a release, Jjquid 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 approximatel_y 5,000 GPM, along with Plant.Circulating Water flow, another Oto 567,000 GPM, in the seaLwell, just prior to entering the 3.4-mile discharge flume into Lake Clinton as depicted in Figure 2.

~roc~ssing and !V1011itoring

. _;-, .. * "i' CPS strictly c<;>ntrols effluents to ensur~ radioactivity released to the env.ironment ,is maintained ALARA and does not exceed federal release limit criteria. Effluent controls inc.lude 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 108

-FIGURE 1 CPS AIRBORNE EFFLUENT RELEASE POl*NTS TURBINE BUILDING .. RADWASTE AHO ROOF a 875'0" ~ SHOP BUILDING ROOFB- 781'0" C()NTROL ROOM

*. AIR HANDUHG UNITS FUS. BUILDINQ R~EL80 0'0' L.....- - - -

. . -., I

___ ___,j/

SGTI fUER UNrrS

(.Q' EL 719'0')

HVAC Exhaus t Vent SGTS Exhaus t Vent

.>. -1 ...

Release* Point Height (feet') 200 200

, , Building _Height (feet) .* * '

190*

190 Rele.ase Point Geome try Duct I* ,*, J>ipe _

- : .... ) i '. *\.. . :- :

RelJase Poi~t Area (ft2) 120 2 Release Point Diamet er (feet) 12* 1 Ann*ual Averag e Flow Rate (ft 3/sec) 3,945 67 Vertica l Exit Velocit y (feet/se c) 33 41

Effective 2(A/rc) 1 ' 2 diamete r Page 8 of 108

flG,U,RE 2 CPS \NAT~RBORN E EFF~U.ENTS.. ~ELEASE,PAT HWAY PLANT SERVlCE WATER

, * *IWHllOOi. * . j.*~~ I.EAST §000 GPMl

.*:2!;fio;;;"""".*.*-. --~'"""'Ir"- -'

,,. .:. */

~JQUlQ RADWA$Te PlSOBARGI: LINE Clo-60 OR 60-300 GPM)

' , l , **,,,.

@) . RAOJATIQ.NJ~ONITOR IJ.AAWTRIP SETPOINT C1J..CU1JJED BASEO 00 ENl-t BATailSOfOPl O~IS mo mwnoN FLOW

. ~ l$Qt.ATtQN VALVE

'l"ERMM'ES RaEASe ON HIGH AAtltmoN.

HtGH RSS,SE FUWI ME. OR WN E) COMPOSITE $AMPLER DlW'llON MW M'E - <.:0U¥Cl'S IJIPR0>3Wl'Et.Y 20 ml EVER\' GO M!NU'raS FROM 11£ DlSCW.RGE fUJME FORMOtmU.Y IJWYSIS SEALWELL

,,. . LAKE PLANT C\RCULATlNG ~ - - - - - - - - '----,___ --,:,_ _ _~ O~\NTON WATER (0-567 ~000 GPM) DISCHARGE FLUME-

. , , , ,3.4J-All.~S '*' . . . *

...t !. *:,, ~ '. '. , ;'* ** ; *: .1*-,:*~*-'i .1 ,*

Page 9 of 108

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 ty[Pe and amount of radioactivity released, the environmen~al 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 radionuclides 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 a~d the growing of gardens for vegetable consumption are impprtant con~.idera,tions when ,.eyalpatir,g_ exposure pathways. Figure 3 illustrates the effluent .

exposure pathways that were considered.'" ,. . *, \

--~-- **~,I'~.

The radioactive gaseous effluent exposL(re pathways include direct radiation, deposition on plants and soil and inhalation by animals and human~~, The radioactive liquid effluent .

e.xposure pathways include fish consumption. ahd direct exposure from Clinton Lake.

f *1 '..' ._* ::/' _:._1_1;!: :_ *:. :. 'i:t~h ., 1 l} .:. ,\ . ,t". ~-~

Dose Assessme,tjt 1

.. . ,;, .,, \f",'*ii.

Whole b'o~i'y ~adiation involves the exp~lLre of all orga.ns'Jn' the hum a~ body to ionizing raqi,ation. 1V1ost.naturally occurring background radiation exp9;sures consist of whole body expd'surei.-although specific organs can receive radiatiqw~xpo'§tire from distinct:radionuclidest Th~se ~~.d,io.nuclides enter the body-1/4:tfrpugh inhalati:o:(;i:1 ~*n*d ingestion and seeJMJ)ff~rent organ:g dependi*~,t on the nuclide. For exa\'n~p./~, rc(~)oactiye i~ d(r'e selectively conce~tr;a)hs in the . ::

thyroid; ~c!dioactive strontiumJn rryJti:eral!ze.it bo'ne, ah'(;ffadioactive cesium colfects in muscle .*

. \, . r. . ~ "'i .*..*,* ~:-,, *. ,,., ,,* ~r :.~ :.: it,, . ,,

arid liver .tis~ue. ., *: * '\:::? . ' * ** *

1,

\* '* ' .~ -~

+ ( . 'i,'I : , I .f.1 ~l The total dos*e_ t~ orga~_s_from a given radionuclide also depends on the amount of . . :*

activity.)n the organi'~:rid the al-h'bunt of time that the radionuclide remains in the body. Some ra,dion~clides re,:nai,rifor .ver/short pedods of time due to their rapid radioacti;e decay and/or

ei'imination r'ate f~of!!itfi~. body, while ~the rs may rem a in longer. / ,,

j(' -~

. '.;* ,.. .. ~'

Radiation dose tb'tfi,e p4blic in t.hei~,rea sygounding CPS)s calculat;eq for,~ac~ r~t!:!,l~e.**

using historical weather cor;idlt°ion,s coupfe(~: \Ati\h:'the' concefi'trati,ohs:,dfradid;~;sff~e*::rryat~Yi~t' *i;

, .' r.* . .:,*-,.-,.". *. * .. *.*. .. , , .* I ,. ,,_,, **. ,.-~t**.\7,'***.l*~-1!,.. *,~~-:l-~ ,1,\. .. , '

present. The dose is calculated f,or,~.11 six't'.~'¢rj\gg6gtc,1ph,i<;al ,s,,ecJi::(rs s;u'i:roµridi)\g;Cpsc:arid'. i_11d1.Jges the location of the nearest resic!e'iit~, veg~t~bh~ glfclehs p'rod~~ing broad lefafvegetables"'an'd dairy animals in all sectors. 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 108

FIGURE 3 EFFLUENT EXPOSURE PATHWAYS ANIMALS Cl:IN'TON POWER (MILK, MEAT) STATION CONSUMED BY PEOPLE

~

t CONSUMED BY ANIMALS

~

CONSUMED BY PEOPLE

." ~

SHOREUN FISH Page 11 of 108

Gaseous Effluents Gaseous effluent radioattivity rele'asea 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.

J,131, 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 Effluei,ts, Liquid effluents may originate from two (2) sources at CPS) The first is effluent from the Radioactive Waste Treatment System. This water is demin'erafi:iedprior to release, and samples*

are,takenafter 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 releas*e plc1nt. The last radioactive liquid release occurred in September of 1992.

Solid, Waste .Shipments

To reduce the radiation exposure to personnel *and mainta*in the federally required ALARAconcept, the NRC and the Department'MTrahsportation*{DOT)' have established limits on the types of radioactive waste and the amount ofradibactivity tliatma'y be p'ai::kaged 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.

j t Page 12 of 108

SECTION 3 SUPPLEMENTAL INFORMATION I. REGULATORY LIMITS The NRC requires nuclear power facilities to be'. designed, constr.ucted 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 {10CFR50 Appendix I), Title 10 of the .Code of Federal Regulations, Part 20,i301 {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 limi_t 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 concentrc;1tions are not exceeded, dose rates due

. to radio.active materials released i.n gaseous -effluents from the site to areas at and bey,ond the site area boundary.shallbe 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 10CFR50 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.

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 Page 13 of 108

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 -cif 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 radi'onuclides 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:

r::

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) fot.i'nd 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 effluerifrelease streams* and --hofbas*ed: upon the gross count*-ra'te from our nionitorihg systems.* Therefore, the' average beta and gamma energies for gaseous effluents as described in Regulatcify Guide--1.21; "Me*asuring,* Evaluating; and "Reporting Radioactivity in Solid' Wastes and' Releas*es of Radioactive Materials in Liquid and Gaseous Effluents from LighFWater-C6oled Nuclear Power*Plants/' are not applicalHe:

Page 14 of 108

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 quanti;ty of deminerali:i;ed water. The collected sai:nples are distilled and analyzed by liquid scintillation. The tritium released was calculated for .each release. point from. the measured tritium concentration, the '(olume of the sample, the tritium collection efficiency, and the respective stack exhaust flow rates.

3. Carbon-14 release values were esti_mated using the methodology included in the EPRI Technical Report 1021106, using the 2020 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 359.5 days.

B. Iodines

. Iodine .is continuously ,collected qn. a silver zeolite cartridge filter via an isokinetic sampling assembly from each release p,oint. filters are normally exchanged once per .week and then analyzed on an HPGe system. The flow rates for: eac_h release point are average_d 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. . Uquid Effluents

Each tank .QfJiquid rapwaste. is recirculated:;fo~ at le 9st two (2) tarak volum~s, s.ampled a_nd a_nalyzedfo.r principal ga_mma emitte.rs prior.to release. Each sample t.ank is recirculated for a sufficie_nt amoµnt qf time priqr;to sampling ensuring_.that a representative sample is obtainecl *.

Si;!mples are then analyzed on ,an HpGe system and liquid release permits are gene.rated based upon the values obtain_e~ horn the-isotopic analysis and -the_mo~t recent -~alues:for H~, gros_s alpha, Fess, Sr 89 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 Page 15 of 108

for calculating the total activity released,f6r'these* isotopes. However, there has not been a radioactive liquid release since September of 1992.

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

where: Er= total percent error E1 ... EN = percent error due to calibration standards, laboratory

analysis, instruments, sample flow,*etc.

Page 16 of 108

SECTION 4

RADIOACTIVE EFFLUENT DATA TABLE 1 Gaseous Effluents - Summation'ot All Releases Data Perioq: January 01, 2020 - December 31, 2020 Continuous Mixed Mode.. . . .

Units Quarter 1 Quarter 2 I Quarter 3 Quarter 4 Est. Total Error,%

A. Fission & Activation Gases

1. Total Release Ci 4.15E+00 0.00E+00 1.09E+01 6.82E+00 3.00E+0l

2. Average release rate

µCi/s.ec for period 5;28E-01 0.00E+00 1.37E+00 8.58E-01

3. Percent of '

ODCM Limit * *

B. Iodines

1. Total lodine-131 Ci 0.00E+00 0.00E+00 0.00E+00 1.12E-06 3.lOE+0l

2. Average release rate

µCi/sec for period 0.00E+00 0.00E+00 0.0E+00 1.41E-07

3. Percent of ODCM Limit * * *

C. Particulates

1. Particulates with Ci 2.40E+0l half-lives >8 days 3.79E-05 3.78E-05 4.14E-05 0.00E+O0

2. Average release rate

µCi/sec for period 4.82E-06 4.81E-06 5.21E-06 0.00E+00

3. Percent of ODCM Limit * * *

D. Tritium

1. Total Release Ci 8.20E+00 6.66E+00 5.86E+00 6.20E+00 2.10E+01

2. Average release rate

µCi/sec for period 1.04E+00 8.47E-01 7.38E-01 7.80E-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 4.302E+00 4.316E+00 4.331E+00 4.322E+O0

2. Average release

µCi/sec 5.45E-01 5.46E-01 5.48E-01 5.48E-01 Rate for period

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

Page 17 of 108

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

Type of ODCM znd 3rd 1 st Quarter % of Limit % of Limit % of Limit 4 th Quarter % of Limit Radiation Limit Quarter Quarter 5

Gamma 1.92E-04

3.84E-03 0.00E+00 0.00E+00 5.05E-04 *1.0lE-02 3.16E-04 6.31E-03 mRad 10 Beta

6.77E-05 6. 77E-04 0.0QE+00 0.00E+00 1. 78E-04 1.78E-03 1.llE-04 1.llE-03 mRad, ***:;

Doses per Year (mRad)

Type of Radiation ODCM Limit Year % of Limit Gamma 10 mRad 1.0lE-03 1.0lE-02 Beta 20 mRad 3.57E-04 1.79E-03 TABLE 1B Doses to a Member of the Public Due to Radioiodines, Tritium, Carbon-14, and Particulates in Gaseous Releases Doses per Quarter (mRem)

ODCM ist % of znd % of 3rd % of 4th % of Organ i..iniit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Bone 7_:5 mRem 9.76E-03 1.30E-01 9.79E-03 .1.31E~01*.* 6.72E-03 8.96E-02 9.81E~03. 1.31E 01 0

Liver 7.5 mRem 1.36E-04 1.81E-03 1.14E-04 1.52E-03 1.021:\04 1.36E-03 1.02E-04 1.36E-03 TBody 7.5 mRem 2.09E-03 2.79E-02 2.07E-03 2.76E-02' 1.45E-03 1.93E-02 2.06E-03 2.75E-02 Thyroid 7.5 mRem 1.35E-04 1.80E-03 1.lOE-04 1.47E-03 9.66E-05 1.29E-03 1.06E-04 1.41E-03 Kidney 7.5 mRem 1.36E-04 1.81E-03 1.13E-04 1.51E-03 1.00E-04 1.33E-03 1.02E-04 1.36E-03 Lung 7.5 mRem 1.35E-b4 1.80E-03 1.lOE-04 1.47E-03 9.69E-05 1.29E-03 1.02E-04 1.36E-03 GILLI 7.5 mRem 1.37E-04 1.83E-03 1.14E-04 1.52E-03 1.02E-04 1.36E-03 1.02E-04 1.36E-03 Doses per Year (mRem)

Type of Organ .. ODCM Limit Dose % of Limit Bone 15 mRem 3.92E-02 2.61E-01 Liver 15 mRem 4.55E-04 3.03E-03 TBody 15 mRem 8.29E-03 5.53E-02 *'

Thyroid 15 mRem 4.47E-04 ; 2.98E-03 Kidney 15 mRem 4.51E-04 3.0lE-03 Lung . ,. 15 mRern 4.44Es04 *_ 2.96E-03 GI [!_Lf 15 mRem 4.55E-04 3.03E-03 Page 18 of 108

TABLE 2 Gaseous Effluents* - Nu.elides Releas'ed Clinton Power Station YEAR: 2020 Mixed Mode Release X Elevated Release ,~_C_o_nt_i~n_u_o_u_s_M_.~o_d_e_-,-----+---x-*-,--I*

Ground-Level Release _ Batch Mode _

~- .,

FissionJ,fases ..-

Xe13s Krssm

~ -c,'" -

Units Ci

,.'. i Quarter 1[1J

"~a"

-,r,

<LLD Quarter '2[~l d

~- ,,

<LLD

' \*

\

'\

Quarter 3[ 11

<LLD Quarter 4[ 1l 1?:J,.._ .,

<LLD

"* ' ~-

Ci <LLD <LLD <LLD -** <LLD Xe133 Ci <LLD. <LLD <LLD <LLD Kras Ci <LLD <LLD <LLD <LLD Ar41 Ci 4.15E+00 <LLD 1.09E+01 6.82E+00 Total for Period Ci 4.15E+00 <LLD 1.09E+01 6.82E+00 B. Iodines 1131 Ci <LLD

\

<LLD <LLD 1.12E-06 1133 Ci <LLD <LLD <LLD <LLD Total for Period Ci <LLD <LLD <LLD 1.12E-06 C. Particulates Co6o \ '.

Ci <LLD 3.80E-06 5.SSE-06 * <lLD y91m [2] Ci <LLD, <LLD* <LLD <LLD Nbgs Ci <LLD, <LLD <LLD <LLD

Ce 1U. Ci 3.56E-06 * ' <LLD <LLD <LLD crs1 Ci 1.92E-os <LLD <LLD <LLD Mns4 ,Ci

7.24E-06 *. -S.06E-06 8.93E-07 <LLD Na24 [21 Ci <LLD <;::LLD <LLD <LLD Cd10g Ci <LLD <LLD <LLD <LLD CsBs [21 Ci <LLD <LLD <LLD <LLD Coss Ci <LLD <LLD <LLD <LLD zn65 Ci 7.85E-06 2.89E-05 3.S0E-05 <LLD Total for Period Ci 3.79E-05 3.78E-05 4.14E-05 <LLD D. Gross Alpha Gross Alpha Ci <LLD <LLD <LLD <LLD E. Tritium , I Total for Period_* Ci 8.20E+00 6.66E+00 5.86E+00 6.20E+00 F. Carbon-14 :

Total for Period Ci 4.30E+00 . 4.32E+00 . ,433E+00 4.32E+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 108

TABLE 3 Radioactive Gaseous Waste LLD Values Lower Limit of Detection*

TYPE OF ACTIVITY ANALYSIS '

(µCi/cc)

Principal Gam,ma Emitters, sr:ooE-04

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

[Pa rticu Iates] b,e Srag, Sr9og sl.00E-11 Gross Alphaf'

sl.00E-11

~ ,, '.

Table 3 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 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 = 4.66. Sb 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 108

Table 3 Notations (continued):

Eis the counting efficiency, in counts per disintegration, Vis the sample size: in units of mass or vdlume, 2.22E+06 is the number of disintegrations per minute (dpm) per microcurie, Y is the fractional radiochemical .yield, when applicable,*

A is the radioactive decay constant for the particular radionuclide (sec- 1 ) and Lit for piant effluents is the elapsed time between the midpoint of sample collection and the time of counting (sec).

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

The LLD is defined as an a priori (before the fact) Hmit 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 , Cs 134 , Cs 137 , Ce 141 , and Ce 114 in iodine and particulate releases. T:his list does r;iot 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'co.mp.osite-~artl~ulate s~m-ple analy;ed quar.terly.

Page 21 of 108

TABLE 4 Waterborne Effluents' - Summation Of All Releases Data Period: January 01, 2020 - December 31, 2020 There were zero (0) liquid radwa*ste releases from CPS in 2020.

Est.

,Quarter Quarter : Quarte'r Quarter Total Units 1 2 ** ' 3 4 Error,%

l\. Fission & Activatio_ n Productsl 1J ..

l ' Total Re.lease Ci

0.00E+00 0.00E+00 ... 0.00E+00 0.O0E+00 N/A Ave~age_dilut!=!d ..

-, . concentration

,£. " ' µCi/ml 0.00E+00 0.00E+00 0.00E+00 0.00E+00 during period :

Percent of ODCM N/A *.

3. % N/A N/A N/A

Limit B~ -Tritium I1I .,

l.. Totai Release Ci 0.00E+00 0.O0E+00 0.00E+00 0.00E+00 N/A

'i Average diluted 2., concentration µCi/ml 0~OOE+00 0.00E+00 0.OOE+00 0.00E+00 during period Pe.rceht of ODCM . ,,

3'.'~* % N/A N/A N/A N/A Limit ;

C. Di.sscilved and Entr.ained Gase~1 11

l.

Total Release 'Ci 0,00E+00 0.00E+00 *o.O0Et00 0.00E+00 N/A Average diluted ,r* i:

2. concentration * µCi/ml Oi00~+00 *o ..ooE+00 . . '

0.00Et90' 0.00E+00 during period *.

.., . .Percent of ODCM

.:,. % N/A N/A. N/A N/A limit D. Gross Alpha Radioactivityl 1J Gross alpha radioactivfry Ci 0.0ciE+00

0.OOE+0O 0.00E+00 0.00E+00 N/A E. Volume of wa*s-i:e Released (prior to Dilution)

Volume of Waste Heleas'ecf (prior t6 Liters b.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+0Q 0:00E_+.00 0.00Et00 0.00E+00 *, N/A used during period

' 111 * * )\'value corresponding to t~n t1me's.the.vai'ues fo.und in 10CFR20 Appendix.B; Table 2,

Column- 2 is* usec:i-* for all Efffuerit'Concentrafiori Limit (ECL) :calculations .. For dissolved .

r;lrid entrcJined noble!_gases, the t:oncentr:atio_ri ls lfmi:ted.to 2.00E~o4'. µCi/rtHtotal a'ctivity ..

Page 22 of 108

TABLE 5

Waterborne Effluents - Nuclides Released

Clinton Power*station YEAR: 2020 There were zero (0) liquid radwaste releases from CPS in 2020.

I Continuous Mode ,I Batch Mode Units Quarter 1 Quarter 2 Quarter 3 ** Quarter 4 A-. Tritium . ..

-f',",

Total for Period Ci O.OOE+OO O.OOE+OO O.OOE+OO ,*. O.OOE+OO B. Fission and Activation Products '

Mns4 Ci 0.00E+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 0.00E+OO 0.00E+OO' Fesg Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Coss Ci 0.00E+OO O.OOE+OO O.OOE+OO 0.00E+OO Co6o Ci O'.OOE+OO O.OOE+Ob O.OOE+OO 0.00E+OO zn6S Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO Srsg '. Ci O.OOE+OO O.OOE+OO O.OOE+OO 0.00E+OO Srgo Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Nbgs Ci 0.00E+OO O.OOE+OO

O.OOE+OO o:ooE+oo zr9S Ci 0.00E+OO O.OOE+OO O.OOE+o*o o:ooE+oo Mo~ 9 Ci 0.00E+OO O.OOE+OO O.OOE+OO 0.00E+OO 1131 *.*. ., *; .,

Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Cs134 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO c 5131 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO.

Ba140 Ci 0.00E+OO O.OOE+OO O.OOE+OO 0.00E+OO La140 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO ce141 Ci 0.00E+OO O.OOE+OO O.OOE+QO O.OOE+OO Ce144 Ci O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+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 0.00E+OO *-. O.OOE+OO. O.OOE+OO 0.00E+OO Krs1 Ci O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO Krsa .. Ci O.OOE+OO O.OOE+OO '* 0.00E+OO O.OOE+OO xe133

Ci O.OOE+OO O.OOE+OO O.OOE+OO O~OOE+OO

. Xe13s -Ci

O.OOE+OQ O.QOE+0,0 , .. Q.OOEtOO .0.QOE+OO

.XeBs' Ci . O.OOE+OO .. O:_OOE+OO O_.OOE+OO O.OOE+OO Total for,Period; . ,, .. , , . ' Ci- O.OOE+OO *; ; 0.00E+OO *-:*:' Q.OOE+OO . l O.QOE+OO Page 23 of 108

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

(µCi/ml)

Principal Gamma Emitters b. '. :S:5.00E-07 1131- ' :S:1.00E-06 Dissolved and Entrained Gases .

S:1.00E-05 (Gamma Emitters) c H3 :S:1.00E-05 Gros*s Alpha :S:1.00E-07 Srsg, Srgo :S:5.00E-08' Fess :S:1.00E~Q6 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),

Eis the counting efficiency, as 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, Page 24 of 108

Table 6 Notations (continued):

Vis the fractional radiochemical yield, when applicable,

'A is the radioactive decay constant for the particular radionuciide (sec.: 1 ) and flt for plant effluents is the elapsed time between the midpo'int of sample*

collection and the time of counting (sec).

Typic.al values of E, V, V, a11d '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 -~mitters for which the LLD requirement applies include the following radionuclides: Mn 5 4, Fe 59 , Co 58 , Co 60 , Zn 65 , Mo 99 , 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 Radioactiye Effluent Releas~ Report.

c Dissolved and entrained gases are: Xe 1 33 , Xe 1 35 , Xe 138 , Kr 85 m, Kr 87 and Kr 88 ; *

,., j; Page 25 of 108

BATCH RELEASES There were zero'(0) liquid radwaste releases from CPS in 2020.

') :.

A. Batch Liquid Releases: 2020

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: 2020

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 108

ABNORMAL RELEASES Information concerning abnormal radio 9 ctiv:e liquid .an.d gaseous releases is presented below for the year 2020. There were no abnormal or unplanned liquid or gaseous releases from CPS in 2020.

Liquid Releases:

Number of Abnormal Liquid Releases: Zero (0)

Activity Released [Ci]: Zero (0)

Gaseous Releases:

Number of Abnormal Gaseous Releases: Zero (0)

Activity Released [Ci]: Zero (0)

Page 27 of 108

SECTION- 5 SOLID WASTE DISPOSAL INFORMATION During this reporting period -January 01, 2020 through December 31, 2020 - there were fourte~n (14) radioacti,ve waste shipments an'd iero (0) irradiated fuel shipments from CPS. In

, addition, the CPS ODCM require!i reporting ~f the following information for soiid waste shipped offsite during the a'l:iove repo'rting period:

1. Container volume:

Class A Waste: 8.02E+03ft 3 /Class B Waste: O.OOE+0O ft 3 / Class C Waste: 0.00E+00 ft 3 This total includes Dry Active Waste (DAW), resins, filter sludges, evaporator bottoms, and other low level waste such. as mixed waste.

, 2. ,Total _c_urie quantity: Class A Waste was 4:93g+Ql curies a_nd <;:lass B \Naste was 0.00E+00 curies and Class C Waste was 0.00E+00 curies in 2020 (determined by dose-to-curie and sample concentration methodology estimates).

3. Principal radionucli,:l_~s: 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 botto111s dewatered.

5. Type of container: General Design and Typ,e,B Containexs. __

6. Solidific~tion agent or absorbent: None_. *_

Page 28 of 108

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

2020 %

ft 3 1.49E+03 Spent resins, filter sludges, ,,

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

Ci 4.77E+01 ft 3 6.S0E+03 Dry compactable waste, **' ,, ,,' ,,,

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

Ci 1.56E+00 ft 3 .0.00E+00 Irradiated components, ,,

C. 2.S0E+0l control rods, etc. (not fuel)

Ci* O.00E+00 ft 3 2.75E+01

d. Other Wastes-Mixed 2.S0E+0l Ci 5.52E-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 Mn-54 28.71% l.37E+0l Fe-55 42.46% 2.03E+0l

/ Co-60 16.27% 7.77E+00 Zn-65 5.22% 2.49E+00 Kr-85 4.43% 2.llE+00

2. Dry compactable waste, contaminated equipment, etc.

Waste Class Nuclide Name % Percent Abundance Curies A Cr-51 2.72% 4.25E-02 Mn-54 38.24% 5.97E-01 Fe-55 26.57% 4.lSE-01 Fe-59 2.67% 4.18E-02 Co-58 1.46% 2.28E-02 Co-60 23.72% 3.70E-01 Ni-63 1.45% 2.26E-02 Zn-65 2.39% 3.73E-02 Page 29 of 108

TABLE.7.(continued)

Solid Waste and Irradiated Fuel Shipments

3. Irradiated Components Waste Class **Nuclide Name * % Percent Abundance Curies N/A N/A N/A

4. Mixed Waste Waste Class Nuclide Name % Percent Abundance Curies A Cr-51 4.2% 2.33E-04 Mn-54 38.95% 2.16E-03 Fe-55 25.81% 1.43E-03 Fe-59 3.59% l.99E-04 Co-58 1.75% 9.68E-05 Co-60 20.48% l.13E-03 Ni-63 1.81% l.00E-04 Zn-65 2.49% l.38E-04 A.3 s.olicJ Waste Disposition:

January - December 2020 Number of Shipments Mode of Transportation Destination .

6 Hittman Transport Energy Solutions - Bear Creek 1560 Bear Creek Ro~d 7 Hittman Transport EnergySolutions LLC.

Clive Disposal Site - Treatment Facility

,. 1 Hittman Transpor,t Waste Control Specialist TSO Facility B. Irradiated_ Fuel Shipmen~s Disposition:

January - December 2020 Number of Shipments Mode of Transportation Destination 0 N/A N/A Page 30 of 108

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 do.se to* the receptor that w9uld 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 2020 maximum expected annual dose from Carbon-14 released from CPS has been calculated using the methodology included in the EPRI Technical. Report 10211.06 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 2020 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 rnethod~logies given in the ODCM.

The activity used in these assessments i:s the t~tal activity rel~ased by CPS for the year 2020 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 108

TABLE 8 Maximum Offsite Doses and Dose Commitments To Members of the Public in Each Sector Data Period: January 01, 2020 - December 31, 2020

.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) [ll (mRem) . (mRad)

Distance Total Total Sec.tor Pathways Organ Age Organ Skin Gamma' 'Beta Organ (km) Body Body N

,. 1.50, GP, I, M, V B A 5.0SE-03 '1.97E-0S* 1.43E-03 7;94E-04 4.06E-04 0.00E+00 0.00E+00 NI\IE 1.50* GP, I B A 1.59E-03 2.63E-05 4.87E-04 1.02E-03 5.21E-04 NE 2.07 GP, I, V B A 4.45E-03 7.llE-06 1.07E-03 3.83E-04 1.96E-04 ENE 2.86 GP, I, V B A 3.S0E-03 4.36E-06 8.38E-04 3.02E-04 1.54E-04 I: 1.67 GP, I, V B A 5.09E-03 1.13E-05 1.22E-03 4.36E-04 2.23E-04 ESE 5.14 GP, I, V B A 3.71E-03 3.27E-06 8.SSE-04 3.20E-04 1.63E-04 SE 3.90 GP, I *B C l.13E-03 5.57E-06 2.73E-04 3.72E-04 1.31E-04 SSE 2.90 GP, I B A 4.l0E-04 4.42~-06 1.24E-04 2.64E-04 1.35E-04 ..

s 4.78 GP, I, M B A 6.54E-03 _2.75E-06 1.0SE-03 2.30E-04 1.lSE-04 !, .*

SSW 4:68 GP, I B A 3.60E-04 2.46E-06 1.13E-04 2.44E-04. 1.25E-04 SW 1.17 GP, I B A 1.19E-03 1.90E-05 3.63E-04 7.62E-04 3.89E-04 WSW 3.62 GP, I, M, V B A 1.00E-02 2.SlE-06 2.14E-03 2.61E-04 '1.33E-04 w 1.95 GP, I B T 5.28E-04 3.99E-06 1.43E-04 2.37E-04 1.21E-04 Wf'JW 2.63. GP, I B A 5.30E-04 3.32E-06 1.59E-04 3.42E-04 1.75E-04 NW 2.65 GP, I, V B A 3.77E-03 4.lSE-06 9.0lE-04 3.24E-04 1.66E-04 NNW 2.05 GP, I, M, V B A 1.87E-02 7.52E-06 3.98E-03 4.86E-04 2.48E-04 Key for Table 8 Pathways *org*an Age GP ,:, Ground* Pia ne "B = Bone A= Adult

. I ='Inhalation .. T =Teen* ..

M =- _Meat ,. 1-=-lnfant V = Vegetation '. *, *,*C=Child

[llThere were zero (0) liquid radwaste releases from CPS in 2020. All doses were within all regulatory limits, including liry,iJ~ f~qm 40CF_R190.

Page 32 of 108

COMPLIANCE WITH 40CFR190 REQUJREMENTS*.

Dosimeter of Legal Records (DLRs) are stationed around CPS to measure the ambient gamma radiation field. Monitqring stations are placed ,near, the site boundary, which includes the Independent Spent Fuel Storage ln.stalla.tion (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 piaces arid popula.tion centers. Coritrollsites are located further than ten:

(10) miles from the site, in areas that sho-uld 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 ciffsite areas. The organ and whole body doses reported in the above tables are determined .using 10CFR50 Appendix I methodology; which encompasses the limits of 40C::FR190. The requirement requires the preparation and submittal of.a Special Report whenever the calcu_l~ted doses from plant generated radioactive effluent~ and _direct radiation e?<ceed 25 mRem to th.e total body or any organ, except the thyroid, which shall be limited to less than or equal to 75 mRem. During 2020, Clinton Power Station operated at 3.90E-02% pf the, 40CFR190 total body limit, 2.08E-01% of the 40CFR190 orga~ limit and 6.88E-4% 40CFR1~0.

thyroid limit.

INDENDENDENT SPENT FUEL-STORAGE INSTALLATIO_N_ (ISFSI)

No radioactive effluents were released from* the Clinton Station ISFSI and no additional casks were placed'~n the pad for th'e period Jan~ary 1, 2020'tlirough Deteniber.31, 2020. Over.

the long term, as more storage ~odules containing dry shielded canisters of spent fuel are placed ori the ISFSI pad, it is expected that ISFSI operatio'ns will become- the :prominent contributor to dose limits in*

this section. ISFSI dos_e contribution is iri the form of direct radiation as no liquid or gas releas'es 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 Calculatfons for HI-STORM FW System for Clinton Power Station.

DOSE TO MEMBERS OF THE PUBLIC WITHIN THE SITE BOUNDARY CPS Offsite Dose Calculation Manual section 6.2 requires that the Rad\oactive Effluent

Rel*ease Rep~rt' *i_nclude

an assessment of th~: r.adiation dose~ from radioactive* liquids and gaseous effluents tb MEMBERS OF THE PUBLIC due tci their activities inside the SITtBOUNDARY .

. Within the CPS site_ boundary there a"re_ seven areas-tbc!t gre ope~ to m~~ber~ of th~ pubU~ a; 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 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 Page 33 of 108

A portion of Clinton Lake at 0.335 kilometers (0.2 miles) in the NW sector At all of the above locations, the plume; inhalation and ground-plane exposure pathways are used for dose calculations. The 2020 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.

\

.J J.

,,.i (n

/" ",l _; */ ~ r,'. ( :: ;

Page 34 of 108

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

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 TO CHAMPAIGN Page 35 of 108

lABLE 9 Calculated ,Doses to Members of the Public .Outing Use of the Department of Natural Resources Recreation Area in the East..:southeast Sector within the CPS Site Boundary Data Period: January 01, 2020 -December 31, 2020 DESCRIPTION DOSE*** UNITS Total Body Dose Rate {Noble Gases) 6.81E-10 mRem/year Skin Dose Rate (Noble Gases) 9.96E-10 mRem/year

~::;::::::===========.-::::::.:::.;.;.-,.::::*,~*=:'.3~*

Gamma Air Dose 1.72E-10 mRad Beta Air Dose 2.SlE-10 mRad Total Body Dose[ 1 l 1.09E-04 mRem Skin Dose 5.48E-06 _mRem

[ll Dose includes the dose values resulting from the rele13se of iodines, particulates (with half lives >8 days), tritium, and C-14 in gaseous effluents.

Highest Organ Dose by Age Group:

Adult Bone ; 2.80E-04 mRem Teen Bone 4.00E-04 mRem Child Bone

5.S0E-04 mRem Infant Bone NAIZJ mRem

[21 Dose(s) are calculated only for the age groups likely to be in the field.

Page 36 of 108

TABLE.10 Calculated Doses to Members o.f th.e Public During Use of the ~oad in the Squtheast Sector within the CPS Site Boundary Data Period: January 01, 2020 -,-December 31, 2020 DESCRIPTION DOSE* UNITS Totai Body bcise Rate (Noble Gases) 2.18E-10 mRem/year Skin Dose Rate (Noble Gases) 3.18E-10 mRem/year Gamma Air:.Dose 6.04E-11 mRad Beta Air Dose 8.83E-11 mRad Total Body Dose[ 1 ) 1.65E-04 mRem Skin Dose 2.24E-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 l.08E-04 mRem Teen Bone

1.53E-04 mRem Child Bone 2.,11E-04 mRem Infant Bone 1.56E-04 mRem Page 37 of 108

TABLE 1-1 Calculated Doses for the Residents in the South-Southeast Sector within the CPS Site Boundary

Data Period: January 01, 2020 - December 31, 2020 DESCRIPTION .DOSE UNITS Total Body Dose Rate (Noble Gases) 2.71E-10 hi Rem/year Skin Dose Rate (Noble Gases) 3.96E-10 mRem/year Gamma Air Dose 2.71E-10 mRad Beta Air Dose 3.96E-10 mRad Total Body Doser 1 l 2.00E~04 mRem Skin Dose 4.81E-06 mRem rii 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 4.24E-0'4. mRem Teen Bone 6.0SE-04 mRem Child Bone 8.34E-04 mRem Infant Bone 6.16E-04 mRem Page 38 of 108

JABLE12 Calculated Doses for the Residents in the Southwest Sector within the CPS Si.te Boundary Data Period: January 01, 2020- December 31, 2020 DESCRIPTION DOSE UNITS Total B.ody Dose Rate (Noble Gases) 7.00E-10 mRem/ye~r Skin Dose. Rate (Noble Gases) 1.02E-09 mRem/year Gamma Air Dose '7.00E-10 mRad Beta Air Dose 1.02E-09 mRad Total Body Dose[ 1 l 5.45E-04 mRem.

Skin Dose 1.82E-05 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 1.15E *mRem Teen Bone 1.64E-03 mRem Child Bone 2.26E-03 mRem Infant Bone 1.67E-03

mRem Page 39 of 108

TAB'LE 13 Calculated 'Doses to Members bf the* Public During Use of the Agricuhural Acreage 'in'the South-Southwest Sector within the CPS Site Boundary Data* Period: January 01, 2020 - December 31, 1020 DESCRIP.JION. . DOSE . UNITS .

Total Body Dose Rate (Noble Gases) 4.62E-10 mRem/year.

Skin Dose Rate (Noble Gases) 6.75E-10 mRem/year Gamma Air Dose 5.20E-11 mRad Beta Air Dose 7.45E-11 inRad **

Total Body Dose[ 1 l 3.23E-05 mRem Skin Dose l.40E-06 rr\Rem

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

Highest Organ Dose by Age Group:

Adult Bone 8.36E-05 mRem Teen Bone . '1.19E-04 *mRem Child Bone NA12 F,, *mRem Infant Bone NAl2l *. mRem

[Zl Dose(s) are calculated only for the age groups likely to be in the field Page 40 of 108

TABLE 14 Calcula,ted Doses for.the Residents in the West~Southwest:Sector,_within,.t~e .CPS. Site

,Boundary: ....

Data Period:)anuary 01, 2020 - Decemb.e.r 31, 2020 DESCRIPTION DOSE UNITS.

Total Body Dose Rate (Nqble Gases) mRem/year

Skin Dose Rate Gamma Air Dose 2.85E-10 mRad Beta Air Dos.e 4.17E-10 mRad Total Body Dosel 1 l .* 2.20E-04 mRem Skin Dose 4.65E-06 mRem 11 1 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 4.66E-04 mRem Teen Bone 6.66E-04, *.

mRem Child Bone 9.18E-04 mRem Infant Bone 6.78E-04 mRem Page 41 of 108

TABLE 15' Calculated Doses to Members of the Public During Use of Clinton Lake in the Northwest Sector

. . , . '*. ' *. 'within ttie CPS Site Boundary ' . ' '. '

Data Period: January 01, 2020 - December 31, 2020 DESCRIPTION DOS'E UNITS Total Body Dose 1.68E-99 mRem/year Skin Dose Rate 2.45E-09 m r Gamma Air Dose 4.22E;,10 mRad Beta Air Dose 6.17E~10 ,mRad Total Body Dose[ 1 l 3.26E-04 mRem Skin Dose 9.03E-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

6.85E-04 * *mRem Teen Bone 9.80E-04 *mRem Child Bone '1.3SE-03 *mRem Infant Bone N/A[ 2 \ .. mRem*

[21 Dose(s) are calculated only for the age groups likely to be in the field Page 42 of 108

SECTION 7 METEOROLOGICAL DATA AND D*l,SPERSION 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 lev_els.

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 micro processor 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 108

TABLE-1.6 Meteorlogical Data.Availability*

Data Period: January 01, 2020 - December 31, 2020

, . ... ' PERCEN_T OF VALID PARAMETER HOURS PARAMETER Quarter 1 Quarter 2 , Quarter 3 Quarter 4

1. Wind Speed

a. 10-Meter-sensor 99.9% 99.2% 99.8% 100.0%

b. 60 Meter sensor ' 98.9% .99.2% 99.8% 100.0%

2. Wind Direction '

a. 10-Meter sensor 99.9% 99.2% 99.8% 100.0%

b. 60 Meter sensor 99.9% - 99.2% 99.8% 100.0%

3. Temperature ..

a. 10-Meter sensor 99.9% 9.9.2% - 99.8% 100.0%

b. 60 M.ete.r sensor 99.9% 99.2% 99.8% 100.0%

c. Te!Tlperature Difference (10m-60m) 99.9% 99.2% 99.8% 100.0%

' 99;2%'

4. Percent of hours for which valid ;10-meter Wind Speed, Wind Direction, and Delta Temperature were available 99.9% 99.8% 100.0%

5. Percent of hours for which valid 60-meter Wind Speed, Wind Direction, and Delta Temperature were available 99.9% 99.2% 99.8% 100.0%

Clinton Power Station was able to achieve 99.7% Meteorological Recoverable Data during 2020 exceeding the minimum criteria of 90% as delineated within Regulatory Guide 1.23.

Page 44 of 108

TAQLE*1'7 Classification of Atmospheric Stability Stability Classification P.asquill Category Defining Conditions Extremely unstable A, ---~-- <'AT~ -'1.9 Moderately unstable . B .* -1. 9 <LiT$. -1. 7 Slightly unstable C -1.7 <LiT:s_ -1.5 Neutral I) -1.5 <LiT:s_ -0.5 Slightly stable * '*.

E . -0.S <LiT:s_ 1.5.

Moderately stable.' F 1.5 <LiT:s_ 4;0 Extremely stable G 4.0 <LiT$. ------

LiT = temperature difference in degrees Celsius per 1.00 meters Page 45 of 108

TABLE 18 Joint Wind Frequency Distribution by Stability Class Reporting Period: January 01, 2020 - December 31, 2020 The following table contains the joint wind frequency tables for CPS. The tables are segregated by sensor elevation and calendar quarter. All tabled values are in hours.

Clinton Power Station Period of Record: January - March 2020 Stability Class - Extremely 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 2 4 0 0 6 NNE 0 0 0 0 0 0 0 NE 0 0 3 0 0 0 3 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 1 0 0 *o 1 s 0 0 3 0 0 0 3 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 3 2 0 0 5 NW 0 0 4 1 0 0 5 NNW 0 0 5 5 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 0 21 12 0 0 33 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 46 of 108

Clinton Power Station Period of Record: January - March 2020 Stability Class - Moderately Unstable *- 6-0rn- l Orn 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 1 0 0 0 2 NNE 0 0 3 0 0 0 3 NE 0 1 5 0 0 0 6 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 1 0 0 0 0 1 SSE 0 0 1 0 0 0 1 s 0 0 2 1 0 0 3 SSW 0 0 5 5 0 0 10 SW 0 0 3 1 0 0 4 WSW 0 0 0 0 0 0 0 w 0 0 0 1 2 0 3 WNW 0 0 2 2 2 0 6 NW 0 1 9 3 0 0 13 NNW 0 0 2 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 4 33 13 4 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: 3 Page 47 of 108

Clinton Power Station Period of Record: January - March 2020 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 4 0 0 0 4 NNE 0 1 4 1 0 0 6 NE 0 4 5 0 0 0 9 ENE 0 1 2 0 0 0 3 E 0 1 0 0 0 0 1 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 2 4 0 0 6 SSW 0 0 10 7 0 0 17 SW 0 1 0 0 0 0 1 WSW 0 0 8 1 1 2 12 w 0 0 1 4 1 0 6 WNW 0 0 4 6 0 0 10

NW 0 1 7 2 1 0 11 NNW 0 1 1 2 0 O* 4 Variable 0 0 0 0 0 0 0 Total 0 11 48 27 3 2 91 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 48 of 108

Clinton Power Station Period of Record: January - March 2020 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 3 22 56 10 0 0 91 NNE 2 29 22 22 10 0 85 NE 2 24 45 18 1 0 90 ENE 2 17 18 0 0 0 37 E 3 16 13 0 0 0 32 ESE 1 25 23 0 0 0 49

SE 0 21 10 0 0 0 31 SSE 1 27 38 7 0 0 73 s 4 17 40 20 3 0 84 SSW 3 16 30 24 3 0 76 SW 2 25 14 1 0 0 42 WSW 2 13 17 4 6 3 45 w 1 20 24 22 7 3 77 WNW 4 37 39 24 22 0 126 NW 2 34 49 33 2 0 120 NNW 0 20 34 15 1 0 70 Variable 0 0 0 0 0 0 0 Total 32 363 472 200 55 6 1128 Hours of calm in this stability class: 0 Hours of missing. wind measurements in thi.s stability class: 0 Hours of missing stabi,lity measurement;s in all stability classes: 3 Page 49 of 108

Clinton Power Station Period of Record: January - March 2020 Stability Class - Slightly 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 12 6 2 0 0 22 NNE 3 11 9 12 1 0 36 NE 3 8 12 9 0 0 32 ENE 3 19 6 0 0 0 28 E 5 12 4 0 0 0 21 ESE 4 49 9 0 0 0 62 SE 5 30 13 0 0 0 48 SSE 3 32 33 2 0 0 70 s 3 22 46 20 7 0 98 SSW 3 23 53 38 2 0 119 SW 4 18 10 8 1 0 41 WSW 2 14 24 5 0 0 45 w 2 19 13 10 1 0 45 WNW 6 22 30 7 1 0 66 NW 2 16 11 9 1 0 39 NNW 0 18 3 1 0 0 22 Variable 0 0 0 0 0 0 0 Total 50 325 282 123 14 0 7 94 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measur~~ents in all stabilit~ class~sj *3 Page 50 of 108

Clinton Power Station Period of Record: January - March 2020 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 1 0 0 0 0 3 NNE 1 1 0 0 0 0 2 NE 0 4 0 0 0 0 4 ENE 2 4 0 0 0 0 6 E 1 1 1 0 0 0 3 ESE 1 1 0 0 0 0 2 SE 0 1 0 0 0 0 1 SSE 1 4 0 0 0 0 5 s 0 4 0 0 0 0 4 SSW 2 3 3 0 0 0 8 SW 2 1 0 0 0 0 3 WSW 3 1 0 0 0 0 4 w 0 4 0 0 0 0 4 WNW 2 2 0 0 0 0 4 NW 2 3 0 0 0 0 5 NNW 4 0 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 23 35 4 0 0 0 62 Hours of calm in this stability class~ 0 Hours of missing wind measurements in this stability class: 0 Hours of missing sta};)ility measurement:s in all stability classes: 3 Page 51 of 108

Clinton Power Station Period of Record: January - March 2020 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 0 0 0 0 0 0 0 NNE 0 1 0 0 0 0 1 NE 1 2 0 0 0 0 3 ENE 2 1 0 0 0 0 3 E 0 0 0 0 0 0 0 ESE 1 0 0 0 0 0 1 SE 0 1 0 0 0 0 1 SSE 2 1 0 0 0 0 3 s 2 1 0 0 0 0 3 SSW 0 1 0 0 0 0 1 SW 0 1 0 0 0 0 1 WSW 1 0 0 0 0 0 1 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 1 0 0 0 0 0 1 NNW 0 0 0 0 0 'O 0 Variable 0 0 0 0 0 Q, 0 Total 10 9 0 0 0 0 19 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability .class: 0 Hours of missing stability measurement~ in a*ll stability classes: 3 Page 52 of 108

Clinton Power Station Period of Record: January - March 2020 Stability Class - Extremely Unstable - 60m-10m Delta-T .(F)

Winds Measured at 60 Meter*s Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 5 2 0 7 NNE 0 0 0 0 0 0 0 NE 0 0 0 2 0 0 2 ENE 0 0 0 1 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 4 0 0 4 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 5 0 0 5 NW 0 0 1 3 0 0 4 NNW 0 0 3 7 0 .o 10 Variable 0 0 0 0 0 0 0 Total 0 0 4 27 2 0 33 Hours of calm in this stability class:. 0 Hours of missing wind measurements in this stability elass: o.

Hours of missing stability measurements in all stability classes: 3 Page 53 of 108

Clinton Power Station*

Period of Record: January - March 2020 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 1 0 2 0 0 3 NNE 0 0 1 0 0 0 1 NE 0 1 4 2 0 0 7 ENE 0 0 1 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 0 0 1 SSE 0 0 0 1 0 0 1 s 0 0 1 2 0 0 3 SSW 0 0 3 3 4 0 10 SW 0 0 2 1 1 0 4 WSW 0 0 0 0 0 0 0 w 0 0 0 0 1 2 3 WNW 0 0 0 2 1 2 5 NW 0 0 4 6 2 0 12 NNW 0 0 2 0 1 0 3 Variable 0 0 0 0 0 0 0 Total 0 2 19 19 10 4 54 Hours of calm in this stability class: 0 Hours of missing winct,measurements in this stability cla;c,s: 0 Hours of missing* stability measurements in all stability classes: 3 Page 54 of 108

Clinton Power Station Period of Record: January - March 2020 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 2 1 0 6 NNE 0 0 3 1 0 0 4 NE 0 1 6 2 0 0 9 ENE 0 0 3 2 0 0 5 E 0 0 0 0 0 0 0 ESE 0 1 1 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 2 1 0 3 SSW 0 0 5 5 5 1 16 SW 0 0 3 1 0 0 4 WSW 0 1 3 6 0 3 13 w 0 0 0 2 3 0 5 WNW 0 0 3 1 6 1 11 NW 0 0 4 3 1 1 9 NNW 0 0 1 2 1 0 4 Variable 0 0 0 0 0 0 0 Total 0 3 35 29 18 .6 91 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 55 of 108

Clinton Power Station Period of Record: January - March 2020 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 7 27 36 9 1 80 NNE 0 11 21 27 12 1 72 NE 0 16 20 25 32 13 106 ENE 1 4 11 20 5 0 41 E 1 8 10 16 0 0 35 ESE 0 6 16 23 6 0 51 SE 0 13. 14 8 1 0 36 SSE l 13 26 19 7 1 67 s 0 12 11 47 18 5 93 SSW 1 9 16 16 14 8 64 SW 0 10 25 10 1 1 47 WSW l 4 21 6 2 9 43 w 3 10 15 23 15 12 78 WNW 1 16 35 19 15 27 113 NW 1 15 43 38 23 6 126 NNW 1 8 25 30 7 5 76 Variable 0 0 0 0 0 0 0 Total 11 162 336 363 167 89 1128 Hours of calm in this stability class: o* ,

Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 56 of 108

Clinton Power Station Period of Record: January - March 2020 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 4 9 4 3 0 20 NNE 0 3 8 7 9 1 28 NE 2 3 2 8 14 1 30 ENE 0 4 8 14 1 0 27 E 0 4 10 9 1 0 24 ESE 0 4 19 16 2 0 41 SE 0 13 39 16 1 0 69 SSE 3 5 21 26 7 2 64 s 0 9 17 28 29 24 107 SSW 0 3 15 47 34 14 113 SW 0 4 14 13 11 2 44 WSW 1 5 9 16 8 4 43 w 0 2 14 17 10 1 44 WNW 1 5 9 23 11 3 52 NW 1 7 19 18 8 3 56 NNW 0 5 18 6 2 1 32 Variable 0 0 0 0 0 0 0 Total 8 80 231 ,268 151 56 794 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 57 of 108

Clinton Power Station Period of Record: January - March 2020 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 3 2 0 0 0 5 NNE 0 1 1 1 0 0 3 NE 0 2 1 0 0 ,o 3 ENE 0 2 0 1 0 0 3 E 0 2 3 2 0 0 7 ESE 1 1 1 0 1 0 4 SE 0 1 1 0 0 0 2 SSE 0 2 2 1 0 0 5 s 0 0 1 1 0 0 2 SSW 0 1 2 3 1 0 7 SW 0 0 2 1 0 0 3 WSW 0 0 1 2 0 0 3 w 0 0 2 3 0 0 5 WNW 0 1 2 1 0 0 4 NW 0 1 1 0 0 0 2 NNW 0 3 1 0 0 '0 4 Variable 0 0 0 0 0 .o 0 Total 1 20 23 16 2 0 62 Hours of calm in this stability class: 0 Hours of missing wind measurements ~n this stability class: 0 Hours of missing stability measurements in all stability classes: 3 Page 58 of 108

Clinton Power Station Period of Record: January - March 2020 Stability Class - Extremely Stable - 60m-10m Delta-T (F)

Winds Measured at 6,0 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 1 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 1 0 0 1 E 0 2 1 1 0 0 4 ESE 0 1 1 0 0 0 2 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 2 2 0 0 4 WSW 0 0 0 1 0 0 1 w 0 0 0 0 0 0 0 WNW 0 0 2 0 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 8 6 5 0 0 19 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 59 of 108

Clinton Power Station Period of Record: April - June 2020 Stability Class - Extremely 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 4 5 0 0 9 NNE 0 0 0 4 0 0 4 NE 0 0 2 0 0 0 2 ENE 0 0 8 0 0 0 8 E 0 1 0 0 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 2 4 0 0 0 6 SSE 0 0 3 0 0 0 3 s 0 0 2 0 0 0 2 SSW 0 0 2 0 0 *o 2 SW 0 0 2 3 0 0 5 WSW 0 0 0 1 0 0 1 w 0 0 0 7 1 0 8 WNW 0 0 2 8 5 0 15 NW 0 0 4 10 0 0 14 NNW 0 0 7 2 0 0 9 Variable 0 0 0 0 0 0 0 Total 0 3 40 40 6 0 89 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of mis.sing stability measurements in .*all stability classes:.

17 Page 60 of 108

Clinton Power Station Period of Record: April - June 2020 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 1 3 1 0 0 5 NNE 0 1 0 0 0 0 1 NE 0 1 3 0 0 0 4 ENE 0 1 8 0 0 0 9 E 0 6 1 0 0 0 7 ESE 0 4 0 0 0 0 4 SE 0 9 1 0 0 0 10 SSE 0 1 4 0 0 0 5 s 0 0 10 1 0 0 11 SSW 0 1 8 6 0 0 15 SW 0 1 2 2 0 0 5 WSW 0 0 3 3 0 0 6 w 0 2 8 4 0 0 14 WNW 0 1 2 4 2 0 9 NW 0 1 8 0 0 0 9 NNW 0 1 3 6 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 31 64 27 2 0 124 Hours of calm in this .stability claS*S: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 17 Page 61 of 108

Clinton Power Station Period of Record: .April - June 2020 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 5 0 0 0 5 NNE 0 1 2 0 0 0 3

'NE 0 2 2 0 0 0 4 ENE 0 8 2 0 0 0 10 E 0 10 1 0 0 0 11 ESE 0 5 0 0 0 0 5 SE 1 14 3 0 0 0 18 SSE 0 4 7 0 0 0 11 s 0 6 11 1 0 0 18 SSW 0 3 15 9 0 0 27 SW 0 4 6 3 0 0 13 WSW 0 4 7 1 0 0 12 w 0 1 12 1 1 0 15 WNW 1 1 8 4 0 0 14 NW 0 3 8 3 0 0 14 NNW 0 1 7 2 0 0 10 Variable 0 0 0 0 0 0 0 Total 2 67 96 24 1 0 190 Hours of calm in this stability class:, 0 Hours of missing wi*nd measurements in this stability class: 0 Hours of missing stability measurements in all stability classes~ *17 Page 62 of 108

Clinton Power Station Period of Record: April - June* 2020 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 13 0 1 0 21 NNE 0 7 18 4 0 0 29 NE 0 16 40 6 0 0 62 ENE 1 20 37 0 0 0 58 E 3 27 9 0 0 0 39 ESE 1 29 6 0 0 0 36 SE 4 23 16 2 0 0 45 SSE 3 31 22 3 0 0 59 s 2 35 33 4 1 0 75 SSW 4 22 35 20 2 0 83 SW 2 23 22 12 0 0 59 WSW 0 20 16 8 1 0 45 w 1 9 28 6 2 0 46 WNW 1 20 22 3 10 0 56 NW 1 20 37 21 7 1 87 NNW 0 11 28 4 1 0 44 Variable 0 0 0 0 0 0 0 Total 23 320 382 93 25 1 844 Hours of calm in this stability class: *O Hours of* missing wind *measurements in this stability class: 0 Hours of missing stability measurements .in all stability classes: 17 Page 63 of 108

Clinton Power Station Period of Record: April - June 2020 Stability Class - Slightly 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 1 18 2 3 0 0 24 NNE 0 8 4 10 3 0 25 NE 1 15 8 2 0 0 26 ENE 5 20 4 0 0 0 29 E 8 27 3 0 0 0 38 ESE 8 52 6 0 0 0 66 SE 4 27 3 1 0 0 35 SSE 7 35 12 0 0 b 54 s 4 39 19 0 0 0 62 SSW 1 27 50 10 2 0 90 SW 1 16 26 1 0 0 44 WSW 3 18 11 0 0 0 32 w 4 21 20 1 0 0 46 WNW 4 26 15 2 0 -0 47 NW 2 14 15 4 0 0 35 NNW 4 15 12 0 0 0 31 Variable 0 0 0 0 0 0 0 Total 57 378 210 34 5 *. 0 684 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: 17 Page 64 of 108

Clinton Power Station Period of Record: April - June 2020 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 6 1 0 0 0 9 NNE 1 8 0 0 0 0 9 NE 4 9 0 0 0 0 13 ENE 3 2 0 0 0 0 5 E 3 7 0 0 0 0 10 ESE 0 3 0 0 0 0 3 SE 3 1 0 0 0 0 4 SSE 2 11 0 0 0 0 13 s 4 4 0 0 0 0 8 SSW 5 4 0 0 0 0 9 SW 6 3 0 0 0 .o 9 WSW 5 9 0 0 0 0 14 w 3 5 0 0 0 0 8 WNW 6 4 0 0 0 0 10 NW 3 10 0 0 0 0 13 NNW 3 2 0 0 0 0 5 Variable 0 0 0 0 0 0 0 Total 53 88 1 0 0 GJ 142 Hours of calm in this stability class: 0 Hours of missing .wind measurements i:n this stability class: 0 Hours of mi.ssing stability measurements in all stabtlity classea: 17 Page 65 of 108

Clinton Power Station Period of Record: April - June 2020 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 2 6 0 0 0 0 8 NE 6 6 0 0 0 0 12 ENE 4 2 0 0 0 0 6 E 2 1 0 0 0 0 3 ESE 2 0 0 0 0 0 2 SE 2 0 0 0 0 0 2 SSE 6 0 0 0 0 0 6 s 6 1 0 0 0 0 7 SSW 5 0 0 0 0 0 5 SW 8 1 0 0 0 0 9 WSW 15 0 0 0 0 0 15 w 3 1 0 0 0 0 4 WNW 6 0 0 0 0 0 6 NW 2 4 0 0 0 0 6 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 -0 0 Total 72 22 0 0 0 0 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: 17 Page 66 of 108

Clinton Power Station Period of Record: April - June 2020 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 1 8 3 0 12 NNE 0 0 0 1 3 0 4 NE 0 0 0 1 0 0 1 ENE 0 0 2 5 1 0 8 E 0 0 0 1 0 0 1 ESE 0 0 1 0 0 0 1 SE 0 0 3 0 0 0 3 SSE 0 0 5 1 0 0 6 s 0 0 2 0 0 0 2 SSW 0 0 2 0 0 .o 2 SW 0 0 0 4 1 0 5 WSW 0 0 0 0 1 0 1 w 0 0 0 3 2 1 6 WNW 0 0 1 5 4 5 15 NW 0 0 1 8 5 0 14 NNW 0 0 0 6 1 1 8 Variable 0 0 0 0 0 0 0 Total 0 0 18 43 21 7 89 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: 17 Page 67 of 108

Clinton Power Station Period of Record: April - June 2020 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 3 2 0 0 5 NNE 0 0 0 0 0 0 0 NE 0 1 0 2 0 0 3 ENE 0 0 3 4 0 0 7 E 0 0 8 2 0 0 10 ESE 0 1 2 1 0 0 4 SE 0 7 4 0 0 0 11 SSE 0 0 2 2 0 0 4 s 0 0 5 6 1 0 12 SSW 0 0 4 7 3 0 14 SW 0 0 1 3 1 0 5 WSW 0 0 1 4 2 0 7 w 0 0 2 6 1 0 9 WNW 0 0 2 3 3 2 10 NW 0 0 3 5 2 1 11 NNW 0 0 3 3 2 4 12 Variable 0 0 0 0 0 0 0 Total 0 9 43 50 15 7 124 Hours of calm in this stability class: 0 Hours of missing 0ind,meas~rements in this stability class:

0 Hours of missing stabi*li ty. measurements in all stabil*ity cl'asses: 17 Page 68 of 108

Clinton Power Station Period of Record: April - June 2020 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 3 0 0 6 NNE 0 1 0 1 0 0 2 NE 0 1 2 0 0 0 3 ENE 0 1 4 4 0 0 9 E 0 5 9 0 0 0 14 ESE 0 3 3 0 0 0 6 SE 0 9 6 3 0 0 18 SSE 0 1 4 5 0 0 10 s 0 3 11 3 0 1 18 SSW 0 1 9 10 7 1 28 SW 0 0 11 0 1 0 12 WSW 0 1 6 4 2 0 13 w 0 0 6 4 0 1 11 WNW 0 1 3 10 1 1 16 NW 0 0 4 9 2 0 15 NNW 0 0 6 1 2 0 9 Variable 0 0 0 0 0 0 0 Total 0 27 87 57 15 4 190 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of miss.ing stability measurements in all stability classes: 17 Page 69 of 108

Clinton Power Station Period of Record: April - June 2020 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 1 11 12 1 1 26 NNE 0 1 11 11 3 0 26 NE 0 2 13 15 10 4 44 ENE 0 4 17 37 6 0 64 E 0 4 15 24 1 0 44 ESE 0 12 22 3 1 0 38 SE 1 16 18 13 3 0 51 SSE 0 7 25 20 3 3 58 s 1 10 37 21 7 2 78 SSW 0 15 14 34 12 5 80 SW 0 9 25 10 11 0 55 WSW 0 5 27 8 6 3 49 w 1 4 19 17 3 3 47 WNW 1 6 10 16 6 7 46 NW 0 10 23 34 15 14 96 NNW 0 4 9 23 4 2 42 Variable 0 0 0 0 0 0 0 Total 4 110 296 298 92 44 844 Hours of calm in this stability class: 0 Hours o'f missinq ~ind measurements in this stability class:* 0 Hours of .missing stability measurements in all stability classes: 17 Page 70 of 108

Clinton Power Station Period of Record: April - June 2020 Stability Class - Slightly Stable - 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 1 10 5 4 0 20 NNE 0 2 7 4 4 9 26 NE 0 0 6 10 1 1 18 ENE 0 3 14 8 1 0 26 E 0 3 22 12 0 0 37 ESE 0 5 33 18 0 0 56 SE 1 10 36 11 0 1 59 SSE 0 4 27 9 4 0 44 s 1 7 34 23 3 .o 68 SSW 0 3 21 31 22 3 80 SW 1 1 15 36 5 0 58 WSW 0 3 8 13 3 0 27 w 0 2 15 27 0 0 44 WNW 0 1 16 24 3 0 44 NW 0 8 16 14 6 0 44 NNW 0 2 17 12 2 0 33 Variable 0 0 0 0 0 0 0 Total 3 55

297 257 58 14 684 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: 17 Page 71 of 108

Clinton Power Station Period of Record: April - June 2020 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 1 2 3 2 0 0 8 NNE 1 0 3 2 0 0 6 NE 0 0 1 1 0 0 2 ENE 0 3 6 4 0 0 13 E 0 0 6 3 0 0 9 ESE 0 1 5 3 0 0 9 SE 1 0 2 0 0 0 3 SSE 0 0 2 0 0 0 2 s 0 3 9 5 0 ', 0 17 SSW 0 0 8 1 0 0 9 SW 0 2 6 1 0 0 9 WSW 0 1 6 5 0 0 12 w 0 1 11 3 0 0 15 WNW 1 1 6 0 0 0 8 NW 0 3 3 5 0 0 11 NNW 0 2 2 4 1 0 9 Variable 0 0 0 0 0 0 0 Total 4 19 79 39 1 0 142 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: 17 Page 72 of 108

Clinton Power Station Period of Record: April - June 2020 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 2 1 1 2 0 0 6 NE 0 0 0 2 0 0 2 ENE 1 0 0 0 0 0 1 E 0 1 10 0 0 0 11 ESE 0 1 4 2 0 0 7 SE 0 1 2 0 0 0 3 SSE 0 1 0 0 0 0 1 s 0 4 3 0 0 ,0 7 SSW 2 3 6 0 0 0 11 SW 0 3 4 0 0 0 7 WSW 2 3 8 2 0 0 15 w 0 1 6 3 0 0 10 WNW 1 1 2 0 0 0 4 NW 1 1 1 2 0 0 5 NNW 1 2 1 0 0 0 4 Variable 0 0 0 0 0 ,0 0 Total 10 23 48 13 0 0 94 Hours of calm in this stability class: 0 Hours of missing ,wind measurements in this ~tability class: 0 Hours of missing stability measurements in all stability classes: 17 Page 73 of 108

Clinton Power Station Period of Record: July - September 2020 Stability Class - Extremely 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 4 0 0 0 5 NNE 0 0 2 1 0 0 3 NE 0 1 11 0 0 0 12 ENE 0 2 0 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 0 1 SE 0 10 1 0 0 0 11 SSE 0 3 1 0 0 0 4 s 0 1 9 2 0 0 12 SSW 0 1 7 0 0 0 8 SW 0 1 1 1 0 0 3 WSW 0 0 1 4 0 0 5 w 0 0 2 0 0 0 2 WNW 0 0 2 0 0 0 2 NW 0 0 10 2 0 0 12 NNW 0 0 2 0 0 0 2 Variable 0 0 0 0 0 0 0 Total 0 21 53 10 0 0 84 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: 4 Page 74 of 108

Clinton -Power Station Period of Record: July - September 2020 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 2 7 0 0 0 9 NNE 0 0 5 0 0 0 5 NE 0 3 3 0 0 0 6 ENE 0 8 1 0 0 0 9 E 0 5 0 0 0 0 5 ESE 0 15 0 0 0 0 15 SE 0 15 0 0 0 0 15 SSE 0 5 0 0 0 0 5 s 0 6 8 1 0 0 15 SSW 0 9 5 0 0 0 14 SW 0 2 5 0 0 0 7 WSW 0 1 3 1 0 0 5 w 0 0 3 1 0 0 4 WNW 0 0 3 1 1 0 5 NW 0 3 3 1 0 0 7 NNW 0 6 1 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 0 80 47 5 1 0 133 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: 4 Page 75 of 108

Clinton Power Station Period of Record: July - September 2020 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 6 0 0 0 9 NNE 0 3 2 1 0 0 6 NE 0 14 7 0 0 0 21 ENE 1 13 0 0 0 0 14 E 0 8 0 0 0 0 8 ESE 0 9 0 0 0 0 9 SE 0 18 0 0 0 0 18 SSE 0 23 0 0 0 0 23 s 0 18 5 1 0 0 24 SSW 0 11 11 0 0 0 22 SW 0 5 7 0 0 0 12 WSW 0 11 8 0 0 0 19 w 0 5 4 0 0 0 9 WNW 1 6 6 1 0 0 14 NW 0 16 4 1 0 0 21 NNW 0 3 1 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 2 166 61 4 0 0 233 Hours of calm in this stability class: 6 Hours of missing wind measurements in this stability class:* 0 Hours of missing stability measurements in all stability classes: 4 Page 76 of 108

Clinton Power Station Period of Record: July - September 2020 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 24 17 0 0 0 43 NNE 1 27 9 0 0 0 37 NE 1 39 26 0 0 0 66 ENE 3 25 4 0 0 0 32 E 7 18 1 0 0 0 26 ESE 7 16 2 0 0 0 25 SE 5 18 2 0 0 0 25 SSE 3 42 9 0 0 0 54 s 10 33 19 3 0 0 65 SSW 3 27 36 21 0 0 87 SW 2 26 16 0 0 0 44 WSW 3 17 14 0 0 0 34 w 1 28 9 1 0 0 39 WNW 3 25 13 3 0 0 44 NW 1 25 14 3 0 0 43 NNW 1 16 4 0 0 0 21 Variable 0 0 0 0 0 0 0 Total 53 406 195 31 0 0 685 Hours of calm in this stability class: 0 Hours of missing, wind measurements in th:i,s stability, class: 0 Hours of_miss:j.ng stability measurements in all stability classes*:, ,4 Page 77 of 108

Clinton Power Station Period of Record: July - September 2020 Stability Class - Slightly 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 1 12 2 1 0 0 16 NNE 2 21 5 0 0 0 28 NE 4 37 9 0 0 0 50 ENE 12 9 0 1 0 0 22 E 15 13 1 0 0 0 29 ESE 20 30 0 0 0 0 50 SE 15 19 0 0 0 0 34 SSE 10 42 1 0 0 0 53 s 9 49 12 1 0 0 71 SSW 11 34 19 1 0 0 65 SW 7 21 9 0 0 0 37 WSW 10 16 3 0 0 0 29 w 4 9 3 0 0 0 16 WNW 5 20 3 0 0 0 28 NW 4 13 2 0 0 0 19 NNW 1 12 3 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 130 357 72 4 0 0 563 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: 4 Page 78 of 108

Clinton .Power Station Period of Record: July - September 2020 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 5 0 0 0 0 8 NNE 8 8 0 0 0 0 16 NE 19 32 0 0 0 0 51 ENE 11 8 0 0 0 0 19 E 20 6 0 0 0 0 26 ESE 13 3 0 0 0 0 16 SE 10 2 0 0 0 0 12 SSE 14 2 0 0 0 0 16 s 8 5 0 0 0 0 13 SSW 12 30 3 0 0 0 45 SW 16 15 0 0 *O 0 31 WSW 9 6 0 0 0 0 15 w 6 1 0 0 0 0 7 WNW 5 12 0 0 0 0 17 NW 10 15 0 0 0 0 25 NNW 8 1 0 0 0 0 9 Variable 0 0 0 0 0 0 0 Total 172 151 3 0 0 0 326 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: 4 Page 79 of 108

Clinton Power Station Period of Record: July - September 2020 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 8 1 0 0 0 0 9 NNE 29 9 0 0 0 0 38 NE 51 22 0 0 0 0 73 ENE 10 2 0 0 0 0 12 E 2 1 0 0 0 0 3 ESE 1 0 0 0 0 0 1 SE 1 0 0 0 0 0 1 SSE 3 2 0 0 0 0 5 s 1 0 0 0 0 0 1 SSW 5 1 0 0 0 0 6 SW 2 7 1 0 0 0 10 WSW 1 1 0 0 0 0 2 w 3 0 0 0 0 0 3 WNW 4 0 0 0 0 0 4 NW 3 2 0 0 0 0 5 NNW 7 0 0 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 131 48 1 0 0 0 180 Hours of calm in this stability class: *b Hours of missing, wind measurements in this stability -class: 0 Hours of missing stability measurements in all stability classes£- 4 Page 80 of 108

Clinton Power Station Period of Record: July - September 2020 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 2 2 0 0 4 NNE 0 0 0 1 1 0 2 NE 0 0 5 5 0 0 10 ENE 0 0 3 2 0 0 5 E 0 0 1 0 0 0 1 ESE 0 0 1 0 0 0 1 SE 0 3 8 0 0 0 11 SSE 0 0 3 0 0 0 3 s 0 1 7 3 2 0 13 SSW 0 0 3 5 0 0 8 SW 0 1 0 2 0 0 3 WSW 0 0 0 5 1 0 6 w 0 0 0 1 0 0 1 WNW 0 0 0 2 0 0 2 NW 0 0 3 7 1 0 11 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 o* 0 Total 0 5 38 36 5 0 84 Hours of calm in this stability class: 0 Hours of misstng wind measurements in t:his stability class: 0 Hours of misstng,stability measurements in *all stability classes:, 4 Page 81 of 108

Clinton Power Station Period of Record: July - September 2020 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 4 6 0 0 10 NNE 0 0 0 3 0 0 3 NE 0 0 4 3 0 0 7 ENE 0 2 6 0 0 0 8 E 0 3 4 G 0 0 7 ESE 0 9 6 0 0 0 15 SE 0 9 6 0 0 0 15 SSE 0 4 2 0 0 0 6 s 0 3 7 5 1 0 16 SSW 0 0 10 2 0 0 12 SW 0 1 4 1 0 0 6 WSW 0 0 5 1 0 0 6 w 0 0 1 2 1 0 4 WNW 0 0 3 0 0 1 4 NW 0 2 4 1 2 0 9 NNW 0 1 3 1 0 0 5 Variable 0 0 0 0 0 0 0 Total 0 34 69 25 4 1 133 Hours of calm in this stability class: :0 Hours of missing wind measurements iri this stability class: 0 Hours of .missing stability measurements in.all stability classes: 4-Page 82 of 108

Clinton Power Station Period of Record: July - September 2020 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 1 6 2 0 0 9 NNE 0 3 0 2 0 0 5 NE 0 9 1 3 0 0 13 ENE 0 12 6 2 0 0 20 E 0 6 6 0 0 0 12 ESE 0 3 3 1 0 0 7 SE 0 21 2 0 0 0 23 SSE 0 13 10 0 0 0 23 s 0 7 9 3 1 0 20 SSW 0 4 14 4 0 0 22 SW 0 4 9 3 0 0 16 WSW 0 6 6 0 0 0 12 w 0 3 3 4 0 0 10 WNW 1 4 4 4 1 0 14 NW 0 8 13 1 1 0 23 NNW 0 1 3 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 1 105 95 29 3 0 233 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: .4 Page 83 of 108

Clinton Power Station Period of Record: July - September 2020 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 10 19 14 1 0 45 NNE 0 13 10 8 0 0 31 NE 0 7 25 23 0 0 55 ENE 1 18 19 12 0 *O 50 E 1 11 9 3 0 0 24 ESE 0 15 6 3 0 0 24 SE 4 16 12 3 0 0 35 SSE 4 13 24 7 3 0 51 s 4 24 19 21 4 2 74 SSW 0 12 23 23 13 3 74 SW 2 15 21 7 0 0 45 WSW 0 10 14 5 0 0 29 w 0 15 20 5 1 0 41 WNW 0 10 19 12 4 0 45

. NW 1 16 12 8 2 2 41 NNW 0 4 12 5 0 o* 21 Variable 0 0 0 0 0 0 0 Total 18 209 264 159 28 *7 685 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: ** 0 Hours of missing stability measurement's in all stability,classes: 4 Page 84 of 108

Clinton Power Station Period of Record~ July - September 2020 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 5 6 4 0 1 17 NNE 0 0 11 4 0 0 15 NE 0 3 16 27 0 0 46 ENE 0 6 19 5 0 0 30 E 1 3 11 3 0 0 18 ESE 1 6 16 10 0 0 33 SE 1 28 27 0 0 0 56 SSE 3 13 33 5 1 0 55 s 0 19 46 21 3 0 89 SSW 0 7 27 14 1 0 49 SW 0 5 23 16 0 0 44 WSW 0 8 9 4 0 0 21 w 0 7 7 10 0 0 24 WNW 1 8 9 11 0 0 29 NW 0 7 5 3 0 0 15 NNW 0 2 12 8 0 0 22 Variable 0 0 0 0 0 0 0 Total 8 127 277 145 5 1 563 Hours of calm in this stability class: 0 Hours of missing wind measurements iIJ. this stability.class: 0 Hours of missing stability measurements .in all stability classes: 4 Page 85 of 108

Clinton Power Station Period of Record: July - September 2020

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 2 10 1 0 0 13 NNE 1 9 0 0 0 0 10 NE 0 1 7 16 0 0 24 ENE 0 2 18 7 0 0 27 E 0 7 19 4 0 0 30 ESE 0 4 14 4 1 0 23 SE 1 9 8 0 0 0 18 SSE 1 13 5 0 0 0 19 s 1 14 5 3 0 0 23 SSW 0 5 20 11 0 0 36 SW 0 6 11 12 0 0 29 WSW 0 5 11 6 0 0 22 w 0 4 3 3 0 0 10 WNW 0 2 3 0 0 0 5 NW 0 4 14 2 0 0 20 NNW 1 0 12 4 0 0 17 Variable 0 0 0 0 0 0 0 Total 5 87 160 73 1 0 326 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: 4 Page 86 of 108

Clinton Power Station Period of Record: July - September 2020 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 1 1 0 0 2 NNE 0 3 3 2 0 0 8 NE 0 4 7 8 0 0 19 ENE 2 7 11 4 0 0 24 E 0 3 27 11 0 0 41 ESE 1 10 6 3 0 0 20 SE 5 8 2 0 0 0 15 SSE 2 6 1 0 0 0 9 s 0 7 2 0 0 0 9 SSW 1 1 2 0 0 0 4 SW 0 2 5 5 0 0 12 WSW 0 0 4 3 0 0 7 w 1 0 1 0 0 0 2 WNW 0 1 1 0 0 0 2 NW 0 2 0 0 0 0 2 NNW 0 1 2 1 0 0 4 Variable 0 0 0 0 0 0 0 Total 12 55 75 38 0 0 180 Hours of calm in this stability clc1.ss: 0 Hours of missing wind measurements in thics stability clas5,: 0-Hours of .missing.stability measqrements .in all stability classes:* 4-Page 87 of 108

Clinton Power Station Period of Record: October - December2020 Stability Class - Extremely Unstable - 6 0rn-1 Orn 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 3 0 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 1 0 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 1 0 0 1 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 1 5 1 0 0 7 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 st&bility*~1~ss~s: 0 Page 88 of 108

Clinton Power Station Period of Record: October - December2020 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 0 1 0 0 1 NNE 0 1 0 2 0 0 3 NE 0 0 3 0 0 0 3 ENE 0 1 0 0 0 0 1 E 0 0 1 0 0 0 1 ESE 0 1 1 0 0 0 2 SE 0 1 2 0 0 0 3 SSE 0 0 1 0 0 0 1 s 0 0 4 2 0 0 6 SSW 0 0 1 5 0 0 6 SW 0 0 5 0 0 0 5 WSW 0 0 2 3 0 0 5 w 0 0 0 0 0 0 0 WNW 0 0 5 4 0 0 9 NW 0 0 15 3 4 0 22-NNW 0 5 5 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 0 9 45 20 4 0 78 Hours of calm in this stability class: 0 Hours of miss ng wind measurements in this stability class: 0 Hours of miss ng stability measurements in all stability classes: 0 Page 89 of 108

Clinton Power Station Period of Record: October - December2020 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 1 1 0 0 2 NNE 0 1 0 0 0 0 1 NE 0 3 3 0 0 0 6 ENE 0 0 4 0 0 0 4 E 0 1 2 0 0 0 3 ESE 0 1 0 0 0 0 1 SE 0 1 1 0 0 0 2 SSE 0 0 0 0 0 0 0 s 0 0 6 9 0 0 15 SSW 0 0 11 5 4 0 20

. SW 0 0 5 2 0 0 7 WSW 0 0 2 5 0 0 7 w 0 0 5 2 0 0 7 WNW 0 0 5 4 2 0 11 NW 0 3 5 0 1 0 9 NNW 0 3 4 1 0 0 8 Variable 0 0 0 0 0 0 0 Total 0 13 54 29 7 0 103 Hours of calm in this stability class:* *o Hours of missing wind measurements in this stability class: 0 Hours of missing stability.measurements in all stability classes: 0 Page 90 of 108

Clinton Power Station Period of Record: October - December2020 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 3 29 42 6 0 0 80 NNE 2 23 33 5 0 0 63 NE 0 28 56 0 0 0 84 ENE 0 14 20 0 0 0 34 E 1 7 3 0 0 0 11 ESE 2 11 9 0 0 0 22 SE 0 9 7 2 0 0 18 SSE 1 8 39 20 0 0 68 s 2 18 24 25 10 0 79 SSW 0 15 41 35 17 4 112 SW 1 7 33 4 0 0 45 WSW 2 17 22 11 1 0 53 w 3 20 25 28 14 3 93 WNW 2 38 70 26 4 1 141

, NW 2 29 46 36 5 0 118 NNW 4 14 21 20 0 0 59 Variable 0 0 0 0 0 o* 0 Total 25 287 491 218 51 8 1080 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~*- o*

Page 91 of 108

Clinton Power Station Period of Record: October - December2020 Stability Class - Slightly 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 10 2 0 0 0 12 NNE 2 10 6 0 0 0 18 NE 2 19 1 0 0 0 22 ENE 3 11 0 0 0 0 14 E 4 7 0 0 0 0 11 ESE 4 17 1 0 0 0 22 SE 4 28 4 0 0 0 36 SSE 9 41 22 5 0 0 77 s 6 23 44 10 3 0 86 SSW 2 14 73 24 6 0 119 SW 8 22 22 2 0 0 54 WSW 5 16 20 3 1 0 45 w 3 16 16 8 0 0 43 WNW 5 37 21 10 1 0 74 NW 1 19 15 1 0 0 36 NNW 1 13 2 0 0 0 16 Variable 0 0 0 0 0 o* 0 Total 59 303 249 63 11 0 685 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 92 of 108

Clinton Power Station Period of Record: October - Decernber2020 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 2 0 0 0 0 4 NNE 3 2 0 0 0 0 5 NE 3 6 0 0 0 0 9 ENE 0 4 0 0 0 0 4 E 1 1 0 0 0 0 2 ESE 7 2 0 0 0 0 9 SE 4 4 0 0 0 0 8 SSE 4 13 1 0 0 0 18 s 1 20 4 0 0 0 25 SSW 0 12 4 0 0 0 16 SW 3 8 1 0 0 0 12 WSW 1 9 0 0 0 0 10 w 4 4 0 0 0 0 8 WNW 0 13 0 0 0 0 13 NW 3 14 0 0 0 0 17 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 37 114 10 0 0 0 161 Hours of calm in this stability class~. 0 Hours of missing wind measurements in this stability clas~:

0 0 Hours of m~ssing.stability measurements in all stability cl~sses: 0 Page 93 of 108

Clinton Power Station

~eriod of Record: October - December2020 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 3 0 0 0 0 0 3 NNE 8 2 0 0 0 0 10 NE 11 0 0 0 0 0 11 ENE 6 5 0 0 0 0 11 E 3 2 0 0 0 0 5 ESE 3 1 0 0 0 0 4 SE 2 1 0 0 0 0 3 SSE 2 3 0 0 0 0 5 s 1 2 0 0 0 0 3 SSW 1 3 0 0 0 0 4 SW 1 1 0 0 0 0 2 WSW 4 5 0 0 0 0 9 w 4 0 0 0 0 0 4 WNW 4 5 0 0 0 0 9 NW 4 3 0 0 0 0 7 NNW 2 2 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 59 35 0 0 0 0 94 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stabili*ty class: 0 Hours of missing stability measurements in* all stability Classes: 0 Page 94 of 108

Clinton Power Station Period of Record: October - December2020 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 3 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 1 0 0 0 1 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 1 0 1 NW 0 0 1 0 0 0 1 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0

'l;'otal 0 0 3 3 1 0 7 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 95 of 108

Clinton Power Station Period of Record: October - December2020 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 1 1 0 3 NNE 0 1 0 0 2 0 3 NE 0 0 2 0 0 0 2 ENE 0 0 1 0 0 0 1 E 0 1 0 0 1 0 2 ESE 0 0 1 1 0 0 2 SE 0 0 3 0 0 0 3 SSE 0 0 1 0 0 0 1 s 0 0 2 3 2 0 7 SSW 0 0 0 1 4 0 5 SW 0 0 1 4 0 0 5 WSW 0 0 0 4 1 0 5 w 0 0 0 0 0 0 0 WNW 0 0 1 6 3 0 10 NW 0 0 5 10 1 ,4 20 NNW 0 1 6 2 0 0 9 Variable 0 0 0 0 0 0 0 Total 0 3 24 32 15 4 78 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class~ 0 Hours of. missing stability measurement3 in all stability classes: 0 Page 96 of 108

Clinton Power Station Period of Record: October - Decernber2020 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 1 1 1 0 3 NNE 0 1 0 0 0 0 1 NE 0 2 3 0 0 0 5 ENE 0 1 1 3 0 0 5 E 0 1 0 1 1 0 3 ESE 0 1 0 1 0 0 2 SE 0 0 1 0 0 0 1 SSE 0 0 1 0 0 0 1 s 0 0 2 2 7 4 15 SSW 0 0 2 9 4 3 18 SW 0 0 2 5 1 0 8 WSW 0 0 0 5 1 1 7 w 0 0 2 4 0 1 7 WNW 0 0 2 3 2 4 11 NW 0 2 4 2 0 1 9 NNW 0 1 2 1 3 0 7 Variable 0 0 0 0 0 0 0 Total 0 9 23 37 20 14 103 Hours of calm in this stability class: : - 0 Hours of missing wind measurements iri this stabili*ty class: 0 Hours of missing* stability measurements in all stability classes: 0 Page 97 of 108

Clinton Power Station Period-of Record: October - December2020 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 2 8 32 32 5 0 79 NNE 1 8 29 12 5 0 55 NE 0 9 19 42 4 0 74 ENE 0 4 13 27 6 0 50 E 0 3 2 9 0 0 14 ESE 0 4 10 6 2 0 22 SE 0 3 9 7 3 0 22 SSE 1 2 7 24 26 5 65 s 1 10 7 17 33 22 90 SSW 0 7 19 34 21 19 100 SW 0 6 20 17 5 0 48 WSW 1 6 17 10 11 2 47 w 2 14 17 22 20 19 94 WNW 1 14 45 40 22 13 135 NW 2 15 29 44 27 6 123 NNW 0 7 15 17 23 0 62 Variable 0 0 0 0 0 0 0 Total 11 120 290 360 213 *8 6 1080 Hours of calm in this stability class: 6 Hours of missing wind measurements in this stability c;tass: 0 Hours of missing stabflity measurements in all stability classes: 0 Page 98 of 108

Clinton Pow~r Station Period of RecorQ: October - Decernber2020 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 2 11 3 0 0 16 NNE 0 4 7 5 0 0 16 NE 0 1 5 2 2 0 10 ENE 0 3 6 9 0 ..o 18 E 1 2 8 3 0 0 14 ESE 0 0 15 3 0 0 18 SE 1 3 23 7 0 0 34 SSE 1 9 23 42 9 1 85 s 0 8 10 36 22 12 88 SSW 0 6 9 48 37 14 114 SW 1 3 5 37 3 0 49 WSW 1 1 8 32 3 1 46 w 0 6 5 21 12 1 45 WNW 1 7 15 20 6 7 56 NW 0 1 28 23 1 4 57 NNW 1 2 13 3 0 .0 19 Variable 0 0 0 0 0 0 0 Total 7 58 191 294 95 40 685 Hours of calm in this stability classc, 0 Hours of miss:i,ng wind measurements in this stability class: Q Hours of missing* stability measurements in all stability classes:* 0 Page 99 of 108

Clinton Power*station Eeriod of Record: October - December2020 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 3 1 1 0 0 5 NNE 0 0 1 1 0 *o 2 NE 0 0 3 1 0 0 4 ENE 0 0 5 4 0 0 9 E 0 1 2 1 0 0 4 ESE 0 2 1 3 0 0 6 SE 0 3 2 1 0 0 6 SSE 0 1 4 4 0 0 9 s 0 4 6 14 1 0 25 SSW 0 1 3 19 0 0 23 SW 0 1 3 12 0 0 16 WSW 0 3 1 9 0 0 13 w 1 1 1 6 0 0 9 WNW 0 0 8 2 0 0 10 NW 0 0 10 3 0 0 13 NNW 0 1 3 3 0 0 7 Variable 0 0 0 0 0 0 0 Total 1 21 54 84 1 0 161 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability 6lass:

0 Hours of. missing stability measurements in all stability classes: 0 Page 100 of 108

Clinton Power Station Period of Record: October - Decernber2020 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 5 0 0 0 5 NNE 0 1 2 3 0 0 6 NE 1 2 3 2 0 0 8 ENE 1 3 2 3 0 0 9 E 1 0 2 1 0 0 4 ESE 0 1 3 2 0 0 6 SE 0 0 1 1 0 0 2 SSE 0 2 4 0 0 0 6 s 0 3 5 2 0 0 10 SSW 1 1 0 2 0 0 4 SW 2 2 1 1 0 0 6 WSW 0 1 2 6 0 0 9 w 0 1 2 0 0 0 3 WNW 0 0 3 0 0 0 3 NW 0 1 2 2 0 0 5 NNW 0 1 6 1 0 .0 8 Variable 0 0 0 0 0 0 0 Total 6 19 43 26 0 0 94 Hours of calm in this stability class: 0 Hours of missing wind measurements il) this stability.class: 0.

Hours of mi.:jsing stability measuremen t.s in. all stability clpsses: 0 Page 101 of 108

SECTtON'S ODCIVI OPERATIONAL REMEDIAL,REQUIREMENT 'REPORT In accordance with cps**oocM 3.1.1 Action* G.1, 3.2.1 Action F.1, and 3.2.2 Action G.1; NON-FUNCTIONAL radioactive liqui'd and gaseous effluentmbriitoring instrumentation channels remaining in a NON-FUNCTIONAL condition for greater than,. the desighated time shall be reported in the Annual Radioactive Effluent Release Report. During the course of 2020, there were zero (O) instances where a. radioactive

liquid or* gaseous effluent mo'nitoring instrumentation channel remained* in* a NON-FUNCTIONAL: condition -for greater than* the designated clock requirement.

Throughout 2020, there was zero (0) instances of missed ODCM required samples and zero (O) instances of delayed ODCM required sampling.

Page 102 of 108

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 2020 reporting period; therefore, there is no documentation required i1;1 the 2020 Annual Radioactive Effluent Release Report.

Page 103 of 108

SECTION 10 NEW LOCATIONS FOR DOSE CALCULATION AND/OR ENVIRONMENTAL MONITORING The following is a summary of the 2020 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 nea.rest residents identified in each of ~he sixteen (16) sectors are shown bel<:Jw.

2020 RESI DEN:r 2019 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 A 2.86 A E 1.67 A 1:67 A ESE 5.14 A 5.14 A SE 3.90* C/A* 4.44 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 2.05* ., .. .. *- ., -*

'NNW

'A' 2.05 A

Indicates any changes from the previous year (l)nfant (C)hild (T)een (A)dult Page 104 of 108

2.0 Broadleaf Garden Census Fifty-NINE (59) gardens within a five (5) kilometer radius were located in the sixteen (16) geographical sectors surrounding CPS. Thirteen (14) gardens contained broad leaf vegetation, which were specifically. identified fior this report. Although .other crops w,ere identified within thes_e areas, they are not addressed as part of this report.

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

TABLE 20 Nearest Broadleaf Garden 2020 GARDENS 2019 GARDENS SECTOR AGE GROUPS AGE GROUPS (km) ** (km)

N ,, 1.50 ,. .A 1.50 A NNE 1.50* '. A* >8*

NE 3.46 A .. 3.46 A*

ENE 4.22* A ' 4.29* A E 1.67 A .1.67 A

_ESE ' :>8* 7.72* A*

SE

\.

>8 >8*

_SSE >8 >8 s >8 >8*

SSW

>8 >8 SW 5.61* A*. >8 ..

. WSW 3.66* A* 4.32 . C/T/A .. ..

w >8 ,. >8*

I

~-* ... WNW' . ' >8 ~**

I

.... .>8* .. , I NW >8* '"

4.70* A*

NNW ,, j .. ,2.05,. .. .A ,, .. ~-- 2.05 A (l)nfant (C)hild (T)een (A)dult Page 105 of 108

3.0 Milking Animal Census Milking animals wjthin the sixteen (16) geographic:ai sectors were located within -five fS) 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 2020 MILKING 2019 MILKING ANIMALS SECTOR 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 6.60 A 6.60 A SSW >8 >8*

SW >8 >8 WSW 4.32 A/T* 4.32* C/A/T*

w 3.29* A/T* >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 108

SECTION 11 CORRECTIONS TO DATA REPORTED IN PREVIOUS REPORTS There were no administrative changes identified in 2020 against previously submitted Annual Radio;:ictive Effluent Releas~ Repprts resulting in an ern~ta dat.a submittal to the Commission.

j * ,, ;*,

Page 107 of 108

SECTION 12 CHANGES TO THE OFFSITE DOSE CALCULATION MANUAL The Offsite Dose Calculation Manual was last revised in December of 2015. Revision 25 of the ODCM is not included with this submittal since no updates were made in 2020.

Page 108 of 108

U-604627, Annual Radioactive Effluent Release Report

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