ML22115A178
| ML22115A178 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/25/2022 |
| From: | Marshall T Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML22115A178 (72) | |
Text
Sequoyah Nuclear Plant, Post Office Box 2000, Soddy Daisy, Tennessee 37384 April 25, 2022 10 CFR 50.4 10 CFR 50.36a 10 CFR 50, Appendix I 10 CFR 72.44(d)(3)
ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D. C. 20555-0001 Sequoyah Nuclear Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327, 50-328, and 72-034
Subject:
Annual Radioactive Effluent Release Report for 2021 Monitoring Period Enclosed is the Annual Radioactive Effluent Release Report (ARERR) for the period of January 1 to December 31, 2021. This report (enclosure) is being submitted in accordance with the respective Sequoyah Nuclear Plant (SQN), Units 1 and 2, Technical Specification (TS) 5.6.2 and Certificate of Compliance for Spent Fuel Storage Casks Nos. 1014 and 1032, Chapter 5.
Offsite Dose Calculation Manual (ODCM), Section 5.2 requires that a Radiological Impact Assessment be submitted with the ARERR for the same reporting period. The assessment is included in the report. There were no changes to the ODCM during the reporting period.
There are no new regulatory commitments contained in this letter. If you have any questions concerning this matter, please contact Mr. Jeffrey Sowa at (423) 843-8129.
Respectfully, Thomas Marshall Site Vice President Sequoyah Nuclear Plant
Enclosure:
Annual Radioactive Effluent Release Report, Sequoyah Nuclear Plant, January -
December 2021
- Marshall, Thomas B.
Digitally signed by Marshall, Thomas B.
Date: 2022.04.25 12:40:27
-04'00'
U.S. Nuclear Regulatory Commission Page 2 April 25, 2022 cc (Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector - Sequoyah Nuclear Plant NRR Project Manager - Sequoyah Nuclear Plant
ENCLOSURE ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT SEQUOYAH NUCLEAR PLANT JANUARY - DECEMBER 2021
1
SequoyahNuclearPowerPlant
TennesseeValleyAuthority
AnnualRadioactive
EffluentReleaseReport
2021
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
RadiologicalImpact
2
I.
Introduction..........................................................................................................................................4
II.
SupplementalInformation....................................................................................................................4
A.
RegulatoryLimits..............................................................................................................................4
B.
LimitationonDoseRate....................................................................................................................5
C.
AverageEnergy.................................................................................................................................5
D.
Measurements&ApproximationsofTotalRadioactivity.................................................................5
E.
BatchReleases..................................................................................................................................7
F.
AbnormalReleases..........................................................................................................................11
G.
Nonroutine,PlannedDischarges...................................................................................................11
H.
RadioactiveWasteSystemTreatmentChanges.............................................................................11
I.
LandUseCensusChanges...............................................................................................................11
J.
EffluentMonitoringInstrumentInoperability>30Days................................................................11
K.
EffluentMonitoringEquipmentSampleDeviation.........................................................................11
L.
OffsiteDoseCalculationManualChanges......................................................................................11
M.
GroundwaterMonitoringandProgram(NEI0707)...................................................................12
N.
Errata/CorrectionstoPreviousARERRs..........................................................................................14
III.
GaseousEffluents...........................................................................................................................15
Table1AGaseousEffluentsSummationofallReleases......................................................................15
Table1BGaseousEffluents-GroundLevelReleases(Batch)...............................................................16
Table1BGaseousEffluents-GroundLevelReleases(Continuous).....................................................17
IV.
LiquidEffluents...............................................................................................................................18
Table2ALiquidEffluentsSummationofallReleases..........................................................................18
Table2BLiquidEffluents-BatchMode................................................................................................19
Table2BLiquidEffluents-ContinuousMode.......................................................................................20
V.
SolidWasteStorageandShipment................................................................................................21
VI.
IndependentSpentFuelStorageInstallation.................................................................................28
VII.
RadiologicalImpacttoMan............................................................................................................29
A.
Introduction....................................................................................................................................29
B.
DoseLimits......................................................................................................................................29
C.
DoseCalculations............................................................................................................................29
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D.
DosesfromAirborneEffluents........................................................................................................30
E.
DosesfromLiquidEffluents............................................................................................................31
F.
PopulationDoses............................................................................................................................32
G.
OffsiteDirectRadiationDose..........................................................................................................32
H.
DosetoaMemberofthePublicInsidetheSiteBoundary.............................................................32
I.
TotalDose.......................................................................................................................................33
J.
Tables..............................................................................................................................................34
Table3ADosesfromAirborneEffluents-1stQuarter..........................................................................34
Table3BDosesfromAirborneEffluents-2ndQuarter.........................................................................35
Table3CDosesfromAirborneEffluents-3rdQuarter..........................................................................36
Table3DDosesfromAirborneEffluents-4thQuarter..........................................................................37
Table4ADosesfromLiquidEffluents-1stQuarter...............................................................................38
Table4BDosesfromLiquidEffluents-2ndQuarter..............................................................................38
Table4CDosesfromLiquidEffluents-3rdQuarter..............................................................................39
Table4DDosesfromLiquidEffluents-4thQuarter..............................................................................39
Table5TotalDosefromFuelCycle.........................................................................................................40
VIII.
MeteorologicalData.41
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I.
Introduction
TheAnnualRadioactiveEffluentReleaseReportcoveringtheoperationofbothunitsis
submittedpursuanttoSequoyahNuclearPlantTechnicalSpecification5.6.2andOffsiteDose
CalculationManual5.2
II.
SupplementalInformation
A. RegulatoryLimits
- 1. GaseousEffluents
Doseratesduetoradioactivityreleasedingaseouseffluentsfromthesitetoareasat
andbeyondtheunrestrictedareaboundaryshallbelimitedtothefollowing:
Noblegases:
x Lessthanorequalto500mrem/yeartothetotalbody.
x Lessthanorequalto3000mrem/yeartotheskin.
Iodines,tritiumandparticulateswithhalflivesgreaterthaneightdays
x Lessthanorequalto1500mrem/yeartoanyorgan.
DosetoamemberofthepublicduetoIodines,tritiumandparticulateswithhalf
livesgreaterthaneightdays
x Lessthanorequalto7.5mremtoanyorganduringanycalendarquarter.
x Lessthanorequalto15mremtoanyorganduringanycalendaryear.
Airdoseduetonoblegases
x Lessthanorequalto5mradforgammaradiationandlessthanorequalto10
mradforbetaradiationduringanycalendarquarter.
x Lessthanorequalto10mradforgammaradiationandlessthanorequalto
20mradforbetaradiationduringanycalendaryear.
- 2. LiquidEffluents
Theannualaverageconcentrationofradioactivityreleasedinliquideffluentsto
unrestrictedareasshallbelimitedtotheconcentrationsspecifiedinTitle10oftheCode
ofFederalRegulations(CFR),Part20(StandardsforProtectionagainstRadiation),
AppendixB,Table2,Column2,forradionuclidesotherthandissolvedorentrainednoble
gases.Fordissolvedorentrainednoblegases,theconcentrationshallbelimitedto2.0E 04microcuries/milliliter(Ci/ml)totalactivity.
Thedoseordosecommitmenttoamemberofthepublicfromradioactivityinliquid
effluentsreleasedtounrestrictedareasshallbelimitedtolessthanorequalto1.5mrem
tothetotalbodyduringanycalendarquarter,lessthanorequalto5mremtoanyorgan
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duringanycalendarquarter,lessthanorequalto3mremtothetotalbodyduringany
calendaryearandlessthanorequalto10mremtoanyorganduringanycalendaryear.
B. LimitationonDoseRate
- 1. GaseousEffluents
Concentrationlimitsforgaseousreleasesaremetthroughcompliancewiththe
maximumpermissibledoseratesforgaseousreleasesasdefinedinplantOffsiteDose
CalculationManual(ODCM).(Thesevaluesareusedasapplicablelimitsforgaseous
effluents.)
Noblegases:
x Lessthanorequalto500mrem/yeartothetotalbody.
x Lessthanorequalto3000mrem/yeartotheskin.
Iodines,tritiumandparticulateswithhalflivesgreaterthaneightdays
x Lessthanorequalto1500mrem/yeartoanyorgan.
- 2. LiquidEffluents
Theeffluentconcentrationlimits(ECL)forliquidsarethoselistedin10CFR20,
AppendixB,Table2,Column2.Fordissolvedandentrainedgases,theECLof2.0E04
Ci/mlisapplied.ThisECLisbasedontheXe135concentrationinair(submersiondose)
convertedtoanequivalentconcentrationinwaterasdiscussedintheInternational
CommissiononRadiologicalProtection(ICRP),Publication2.(Thesevaluesareusedas
applicablelimitsforliquideffluents.)
C. AverageEnergy
SequoyahNuclearPlant'sODCMlimitsthedoseequivalentratesduetothereleaseof
noblegasestolessthanorequalto500mrem/yeartothetotalbodyandlessthanor
equalto3000mrem/yeartotheskin.TheuseofdoseratesisinaccordancewithNUREG 0133,"PreparationofRadiologicalEffluentTechnicalSpecificationsforNuclearPower
Plants."Sincethereleaserateisnotusedforeffluentcontrol,theaverageenergy
discussedinRegulatoryGuide1.21(usedforreleaseratecontrol)isnotincludedinthis
report.
D. Measurements&ApproximationsofTotalRadioactivity
RadioactivitymeasurementsperformedinsupportoftheSequoyahNuclearPlantODCM
meettheLowerLimitofDetectionrequirementsgiveninODCMTables2.21and2.22.
- 1. GaseousEffluents
FissionandActivationGases
Airborneeffluentgaseousactivityiscontinuouslymonitoredandrecorded.Additional
grabsamplesfromtheshieldbuilding,auxiliarybuilding,servicebuildingandcondenser
vacuumexhaustsaretakenandanalyzedatleastmonthlytodeterminethequantityof
noblegasactivityreleasedforthemonthbasedontheaverageventflowratesrecorded
forthesampleperiod.Also,noblegassamplesarecollectedandevaluatedfortheshield
andauxiliarybuildingsfollowingstartup,shutdownorratedthermalpowerchange
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exceeding15percentwithinonehour(SamplingisonlyrequiredifthedoseequivalentI 131concentrationintheprimarycoolantorthenoblegasactivitymonitorshowsthat
thecontainmentactivityhasincreasedmorethanafactorof3).
Thequantityofnoblegasesreleasedthroughtheshieldandauxiliarybuilding
exhaustsduetopurgingorventingofcontainmentandreleasesofwastegasdecaytanks
arealsodetermined.
Thetotalnoblegasactivityreleasedforthemonthisthendeterminedbysummingof
theactivityreleasedfromeachventforthesamplingperiods.
IodinesandParticulatesinGaseousReleases
lodineandparticulateactivityiscontinuouslysampled.Charcoalandparticulate
samplesaretakenfromtheshieldandauxiliarybuildingexhaustsandanalyzedatleast
weeklytodeterminethetotalactivityreleasedfromtheplantbasedontheaveragevent
flowratesrecordedforthesamplingperiod.
Also,particulateandcharcoalsamplesaretakenfromtheshieldandauxiliarybuilding
exhaustsonceper24hoursfor2daysfollowingstartup,shutdown,oraratedthermal
powerchangeexceeding15percentwithinonehour.Thequantityofiodineand
particulatereleasedfromeachventduringeachsamplingperiodisthendetermined
usingtheaverageventflowratesrecordedforthesamplingperiodandactivity
concentration.
Thetotalparticulateandiodineactivityreleasedforthemonthisthendeterminedby
summingallactivityreleasedfromtheshieldandauxiliarybuildingexhaustsforthe
samplingperiods.
Carbon14inGaseousReleases
TheCarbon14productionandeffluentsourcetermestimateswerebasedonEPRI
methodologyprovidedinEPRIReport1021106,"EstimationofCarbon14inNuclear
PowerPlantGaseousEffluents,"datedDecember2010.Itwasdeterminedthat21.6
curiesofCarbon14isgeneratedannuallyatSequoyahNuclearPlant.However,only98%
isconsideredreleasedasgasandonlythecarbondioxideform(20%)ofthatisusedin
thegaseousdosecalculations
- 2. LiquidEffluents
Batch(Radwasteandduringperiodsofprimarytosecondaryleakage,condensate
regenerantstocoolingtowerblowdown)
Totalgammaisotopicactivityconcentrationsaredeterminedoneachbatchofliquid
effluentpriortorelease.Thetotalactivityofareleasedbatchisdeterminedbysumming
eachnuclide'sconcentrationandmultiplyingbythetotalvolumedischarged.Thetotal
activityreleasedduringamonthisthendeterminedbysummingtheactivitycontentof
eachbatchdischargedduringthemonth.
ContinuousReleasesandPeriodicContinuousReleases(Condensateregenerants,
turbinebuildingsump,andsteamgeneratorblowdown)
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Totalgammaisotopicactivityandtritiumconcentrationsaredeterminedmonthlyon
onecompositesampleeachfromthecondensatesystem,andtheturbinebuildingsump.
Thetritiumvalueisappliedtoreleasesoverthemonth.Totalgammaisotopicactivity
concentrationforUnits1and2steamgeneratorblowdownisdetermined3timesa
week.InadditiontoODCMTable2.21,tritiumconcentrationsaredetermined3timesa
week,averagedforthemonth,andappliedtoreleasesoverthemonth.Thetotalactivity
ofthecontinuousreleaseisdeterminedbysummingeachnuclide'sconcentrationand
multiplyingbythetotalvolumedischarged.
E. BatchReleases
- 1. Gaseous
- 2. Liquid
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
1.Gaseous
1.NumberofBatch
Releases
29
29
30
25
2.Totaldurationof
batchreleases
minutes
2.09E+04
5.63E+04
1.63E+04
5.64E+04
3.Maximumbatch
releaseduration
minutes
9.76E+02
3.18E+04
8.13E+02
3.63E+04
4.Averagebatch
releaseduration
minutes
7.20E+02
1.94E+03
5.42E+02
2.26E+03
5.Minimumbatch
releaseduration
minutes
2.50E+01
3.60E+01
7.70E+01
2.90E+01
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
1.Liquids
1.NumberofBatch
Releases
29
49
40
48
2.Totaldurationof
batchreleases
minutes
4.90E+03
7.62E+03
6.45E+03
6.51E+03
3.Maximumbatch
releaseduration
minutes
1.98E+02
1.90E+02
1.93E+02
1.79E+02
4.Averagebatch
releaseduration
minutes
1.69E+02
1.56E+02
1.61E+02
1.36E+02
5.Minimumbatch
releaseduration
minutes
1.20E+02
1.14E+02
1.10E+02
9.90E+01
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ReleaseType:Gaseous(Steam)
ReleasePoint:Unit1PowerOperatedReliefValves(PORV)1,2,3,&4
Date(s)ofRelease:4/10/2109:5105/08/2120:35
ThisevaluationisforthereleasetotheenvironmentthatoccurredfromUnit1PORVs1,2,3and4
duringtheU1R24refuelingoutage.Followingthereactortrip,theSteamGeneratorPORVswereopen
forperiodsoftimeduringtheoutage.Thefollowingisdatausedtodeterminethecuriesanddose
impactsasaresultoftherelease:
x TheevaluationassumedthereleasewascontinuousfromPORVs1,2,3,and4.
x TherehavebeennogammaemittingradionuclidesidentifiedinanySecondaryCoolant
samplesduringthepreviouscycle.
ThevolumeofthesteamgeneratorwastakenfromWestinghouseGuidelinesforSecondaryWater
Chemistry.Thelistednormalwaterlevelvalueof3516ft3wasusedasaconservativevalue.This
calculationassumesthatthetotalvolumeofthegeneratorswasreleasedandthatallthetritium
presentinthatinitialvolumewasreleased.Thecalculationforthetotaltritiumactivityreleasedisas
follows:
3516ft3/generator*2.832E+04ml/ft3*4generators=3.983E+08ml
9.49E07Ci/ml*3.983E+08ml=3.78E+02CiofH3or3.78E04CiofH3
Theactivityof3.78E04Ciwasaddedtothe2ndQuartersectionofTable1AGaseousEffluents
SummationofAllReleasesandTable3BDosesfromAirborneEffluents2ndQuarter.
IndividualDoses
PathwayExternal
Dose
Quarterly
Limit
Percentof
Limit
Location
Sector/Distance/Unit
GammaAir
0.00E+01mrad
5mrad
<1
N/A
BetaAir
0.00E+01mrad
10mrad
<1
N/A
Submersion
TotalBody
0.00E+01mrad
10mrad
<1
N/A
Skin
0.00E+01mrad
10mrad
<1
N/A
OrganDose
Child/Thyroid
2.11E07mrad
7.5mrem
<1
WSW/1152/meters
Child/TotalBody
2.11E07mrad
7.5mrem
<1
WSW/1152/meters
PopulationDoses
TotalBodyDose
2.00E06manrem
MaximumOrganDose(organ) 2.00E06manrem(Thyroid,Liver,Bone,GIT,Lung,Kidney)
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ReleaseType:Gaseous(Steam)
ReleasePoint:Unit1PowerOperatedReliefValves(PORV)1,2,3,&4
Date(s)ofRelease:8/5/2123:1908/08/2112:00
ThisevaluationisforthereleasetotheenvironmentthatoccurredfromUnit1PORVs1,2,3and4
duringtheUnit1PlannedOutagetorepairTurbineDrainLinesteamleak.Followingthereactortrip,
theSteamGeneratorPORVswereopenforperiodsoftimeduringtheoutage.Thefollowingisdataused
todeterminethecuriesanddoseimpactsasaresultoftherelease:
x TheevaluationassumedthereleasewascontinuousfromPORVs1,2,3,and4.
x TherehavebeennogammaemittingradionuclidesidentifiedinanySecondaryCoolant
samplesduringthepreviouscycle.
ThevolumeofthesteamgeneratorwastakenfromWestinghouseGuidelinesforSecondaryWater
Chemistry.Thelistednormalwaterlevelvalueof3516ft3wasusedasaconservativevalue.This
calculationassumesthatthetotalvolumeofthegeneratorswasreleasedandthatallthetritium
presentinthatinitialvolumewasreleased.Thecalculationforthetotaltritiumactivityreleasedisas
follows:
3516ft3/generator*2.832E+04ml/ft3*4generators=3.983E+08ml
1.15E06Ci/ml*3.983E+08ml=4.60E+02CiofH3or4.60E04CiofH3
Theactivityof4.60E04Ciwasaddedtothe3rdQuartersectionofTable1AGaseousEffluents
SummationofAllReleasesandTable3CDosesfromAirborneEffluents-3rdQuarter.
IndividualDoses
PathwayExternal
Dose
Quarterly
Limit
Percentof
Limit
Location
Sector/Distance/Unit
GammaAir
0.00E+01mrad
5mrad
<1
N/A
BetaAir
0.00E+01mrad
10mrad
<1
N/A
Submersion
TotalBody
0.00E+01mrad
10mrad
<1
N/A
Skin
0.00E+01mrad
10mrad
<1
N/A
OrganDose
Child/Thyroid
1.99E07mrad
7.5mrem
<1
S/4010/meters
Child/TotalBody
1.99E07mrad
7.5mrem
<1
S/4010/meters
PopulationDoses
TotalBodyDose
2.07E06manrem
MaximumOrganDose(organ) 2.07E06manrem(Thyroid,Liver,Bone,GIT,Lung,Kidney)
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ReleaseType:Gaseous(Steam)
ReleasePoint:Unit2PowerOperatedReliefValves(PORV)1,2,3,&4
Date(s)ofRelease:10/22/2108:00-11/06/2110:09
ThisevaluationisforthereleasetotheenvironmentthatoccurredfromUnit2PORVs1,2,3and4
duringtheU2R24refuelingoutage.Followingthereactortrip,theSteamGeneratorPORVswereopen
forperiodsoftimeduringtheoutage.Thefollowingisdatausedtodeterminethecuriesanddose
impactsasaresultoftherelease:
x TheevaluationassumedthereleasewascontinuousfromPORVs1,2,3,and4.
x TherehavebeennogammaemittingradionuclidesidentifiedinanySecondaryCoolant
samplesduringthepreviouscycle.
ThevolumeofthesteamgeneratorwastakenfromWestinghouseGuidelinesforSecondaryWater
Chemistry.Thelistednormalwaterlevelvalueof3516ft3wasusedasaconservativevalue.This
calculationassumesthatthetotalvolumeofthegeneratorswasreleasedandthatallthetritium
presentinthatinitialvolumewasreleased.Thecalculationforthetotaltritiumactivityreleasedisas
follows:
3516ft3/generator*2.832E+04ml/ft3*4generators=3.983E+08ml
1.20E06Ci/ml*3.983E+08ml=4.76E+02CiofH3or4.76E04CiofH3
Theactivityof1.25E03Ciwasaddedtothe4thQuartersectionofTable1AGaseousEffluents
SummationofAllReleasesandTable3DDosesfromAirborneEffluents-4thQuarter.
IndividualDoses
PathwayExternal
Dose
Quarterly
Limit
Percentof
Limit
Location
Sector/Distance/Unit
GammaAir
0.00E+01mrad
5mrad
<1
N/A
BetaAir
0.00E+01mrad
10mrad
<1
N/A
Submersion
TotalBody
0.00E+01mrad
10mrad
<1
N/A
Skin
0.00E+01mrad
10mrad
<1
N/A
OrganDose
Child/Thyroid
1.38E07mrad
7.5mrem
<1
SSW/4363/meters
Child/TotalBody
1.38E07mrad
7.5mrem
<1
SSW/4363/meters
PopulationDoses
TotalBodyDose
2.08E06manrem
MaximumOrganDose(organ) 2.08E06manrem(Thyroid,Liver,Bone,GIT,Lung,Kidney)
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F. AbnormalReleases
Incalendaryear2021therewerenoabnormalreleases.
G. Nonroutine,PlannedDischarges
Incalendaryear2021therewerenononroutineplanneddischarges.
H. RadioactiveWasteSystemTreatmentChanges
Incalendaryear2021therewerenochangestotheradwastesystemortheprocess
controlprogram.
I. LandUseCensusChanges
Incalendaryear2021therewerenochangestothelandusecensus.
J. EffluentMonitoringInstrumentInoperability>30Days
Incalendaryear2021therewerenoeffluentmonitoringinstrumentsinoperable>30
days.
K. EffluentMonitoringEquipmentSampleDeviation
Date
DescriptionofDeviation
5/6/2021
CR#1692579
On5/6/21at0941OperationsenteredODCMnonconformance1.1.2actionsC,
D,andLduetocondenservacuumpumpsbeingstartedwhilebypassingthe1 RM90119and1RM9099radmonitors.OPSnotifiedChemistryandat1515
hadplacedtheODCMactionsintheLCOtrackerineSOMS.Duetoplant
conditionstheradmonitorsremaininbypass.
On5/7/21atapproximately1230,Chemistrysupervisiondiscoveredduringlog
reviewthatcompensatorysamplinghadnotbeenperformedsincetheentry
intotheODCMactions.TheapplicableactionforChemistryisactionDinthe
ODCMwhichistoperformanoblegassampleonceevery12hourswhileinnon compliance.Upondiscoveryasamplewasimmediatelyobtainedat1245and
analyzedwhichmakesatotalof2missedODCMsamplessincethenon conformancewasdeclared.
AChemistrydepartmentstandingorderwasissuedtorequireshifttechnicians
tovalidateandenterthestatusofradiationmonitorsintheeSOMSChemistry
logsandlaterreportingonthestatusofradiationmonitorsduringthe
Operationsturnoveronashiftlyfrequency.
L. OffsiteDoseCalculationManualChanges
Incalendaryear2021therewerenochangestotheOffsiteDoseCalculationManual.
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M. GroundwaterMonitoringandProgram(NEI0707)
MonitoringWells
SequoyahNuclearPlantstartedinvestigatingtritiumreleasestothegroundwaterin
2003duetoidentificationoftritiuminoneoftheonsitemonitoringwells.Thisstudy
involvedpressuretestingoftheradwastedischargeline,installationandsamplingof
groundwaterwells,visualinspectionundertherefuelingwaterstoragetanks(RWSTs)
andinspectionofdrainlines.InadditiontotheoneonsiteRadiologicalEnvironmental
MonitoringProgram(REMP)groundwatermonitoringwell,SQNalsohas29nonREMP
monitoringwellstosupportmonitoringtheonsitegroundwaterplumeandforthe
presenceorincreaseofradioactivity.SQNupdatedthenumberofwellsin2019tobetter
monitortheonsitegroundwater.Thesewellsaresampledperiodicallyfortritium.
Thetritiumconcentrationsobtainedin2021fromthesenonREMPwellsarelisted
below.Initialandfollowupanalysesforthesemiannualsamplingprocedureindicated
nogammaactivity.TritiumfluctuationinWell47icontinuestobeobserved(ref.
CR#1677302)andisconsistentwithseasonalvariationduetosourcesfrompreviously
documentedlegacyreleases.Noleakstositegroundwaterarecurrentlypresent.
WellID
Date
Tritium(pC/L)
Date
Tritium(pC/L)
W9
1/12/20210:00
<1.380E+02
4/6/202110:35
<1.870E+02
7/13/20210:00
<1.660E+02
10/27/202111:20
<2.470E+02
W10
1/14/20210:00
3.78E+03
3/4/202112:50
3.40E+03
4/7/202113:20
3.98E+03
7/15/202115:20
1.80E+03
10/28/202114:20
1.90E+03
W11
1/12/20210:00
<1.360E+02
4/7/202112:45
<2.060E+02
7/13/202114:45
<1.620E+02
10/26/202111:55
<2.510E+02
W12
1/14/20210:00
1.17E+03
3/4/202111:50
8.67E+02
4/7/20219:55
1.12E+03
7/14/202115:25
7.15E+02
10/28/202114:50
8.77E+02
W13
1/12/20210:00
<1.400E+02
4/7/20219:15
<1.960E+02
7/13/202113:50
<1.980E+02
10/26/202110:40
<2.500E+02
W15
1/13/20210:00
<1.660E+02
3/4/202113:35
<2.440E+02
4/7/202114:05
<2.070E+02
7/14/202114:50
2.45E+02
10/28/202113:30
<1.950E+02
W16
1/13/20210:00
Dry
3/4/202115:45
3.73E+02
4/6/20219:50
6.26E+02
8/6/202111:05
6.54E+02
10/27/202115:53
Dry
W18
1/13/20210:00
4.30E+02
4/6/202112:15
4.72E+02
7/14/202111:45
3.98E+02
10/28/202112:05
3.73E+02
W24
4/5/202111:45
<1.920E+02
10/28/202110:05
<2.070E+02
W25
4/5/202112:20
<1.960E+02
10/26/202115:55
<2.450E+02
W26
4/5/202113:00
<1.940E+02
10/26/202115:25
<2.510E+02
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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13
W27
4/7/20210:00
4.15E+02
10/27/202113:50
3.01E+02
W28
4/6/202115:05
<1.950E+02
10/27/202112:10
<2.480E+02
W36
1/12/20210:00
<1.370E+02
4/7/20218:45
<1.960E+02
7/13/202113:10
<1.610E+02
10/26/202112:20
<2.490E+02
W37
4/5/202113:50
<1.950E+02
10/26/202114:45
<2.480E+02
W38
1/14/20210:00
3.00E+02
4/5/202115:15
3.45E+02
7/15/202111:25
2.39E+02
10/27/202113:10
2.94E+02
W39
1/12/20210:00
<1.370E+02
4/6/20219:10
<1.880E+02
7/13/202111:55
<1.710E+02
10/27/202110:35
<2.410E+02
W40
4/6/202113:40
<1.870E+02
10/25/202113:40
<2.480E+02
W41
4/6/202114:25
<1.950E+02
10/25/202114:40
<2.470E+02
W42
1/12/20210:00
<1.400E+02
4/6/202113:00
<1.940E+02
7/14/202110:10
<1.630E+02
10/25/202115:25
<2.470E+02
W43
1/13/20210:00
<1.320E+02
4/7/202114:40
<2.020E+02
7/14/202110:50
<2.070E+02
10/26/202113:10
<2.510E+02
W44
1/13/20210:00
<2.660E+02
4/8/20219:10
<2.060E+02
7/15/202113:20
<2.360E+02
10/27/202115:00
2.72E+02
W45i
1/13/20210:00
2.43E+02
4/8/202110:20
3.03E+02
7/15/202112:40
3.81E+02
10/7/202114:30
<1.970E+02
W45s
1/13/20210:00
9.26E+02
4/8/20219:45
1.65E+03
7/15/202112:15
9.92E+02
10/27/202115:55
Dry
W46i
1/14/20210:00
7.04E+02
4/7/202111:10
5.58E+02
7/14/202114:05
2.96E+02
10/28/202111:20
5.65E+02
W46s
1/14/20210:00
<1.680E+02
4/7/202110:40
<2.060E+02
7/14/202113:30
1.45E+02
10/26/202113:45
<2.480E+02
W47i
1/14/20210:00
2.21E+04
3/4/202115:20
1.86E+04
4/8/202112:05
1.38E+04
7/15/202114:35
2.32E+04
10/28/202115:45
2.15E+04
W47s
1/14/20210:00
8.68E+03
3/4/202114:35
9.80E+03
4/8/202111:30
3.41E+03
7/15/202114:05
9.44E+03
10/28/202115:25
1.48E+03
W48
1/13/20210:00
1.61E+03
4/6/202111:20
1.27E+03
7/14/202112:45
1.26E+03
10/28/202112:50
1.20E+03
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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14
Dosesfroml131WaterlngestionPathway
TheREMPrequirementsasspecifiedinTable3.121fromNUREG1301,"OffsiteDoes
CalculationManualGuidance:StandardRadiologicalEffluentControlsforPressurized
WaterReactors,"April1991,requiresanI131specificanalysisfordrinkingwaterpathway
samplesiftheannualdosefromI131isgreaterthan1mrem.Toevaluatetheneedfor
implementationofthisadditionalanalysis,thedrinkingwaterpathwaydosefromI131to
themaximumorganandagegroupiscalculated.Theevaluationconfirmsthatthedrinking
waterpathwaydosefromI131waslessthanthe1mremlimitandthattheperformanceof
theI131specificanalysisisnotrequiredforSQNREMPdrinkingwatersamples.
N. Errata/CorrectionstoPreviousARERRs
NocorrectionsneededtopreviousARERRs.
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
I131Ci
0.00E+01
3.070E06
0.00E+01
0.00E+01
0.00E+01
3.070E06
Child/Thyroid(mrem)
0.00E+01
3.20E07
0.00E+01
0.00E+01
0.00E+01
3.20E07
Population/Thyroid(mrem)
0.00E+01
1.10E05
0.00E+01
0.00E+01
0.00E+01
1.10E05
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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15
III.
GaseousEffluents
Table1AGaseousEffluentsSummationofallReleases
ApplicableLimitsareexpressedintermsofdose.SeeTables3AD.
Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels.
N/AErrorsinmeasurementarenotreportedforthesevaluessincenonewereidentifiedduring
thereportingperiod.
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
Error%
A.FissionandActivationGases
1.TotalRelease
Curies
1.63E01
1.45E+00
1.98E01
2.57E01
2.06E+00
11%
2.AverageReleaseRatefor
Period
uCi/sec
2.10E02
1.84E01
2.49E02
3.23E02
3.PercentofTechnical
Specification(TS)Limit
%
B.Iodines
1.TotalRelease
Curies
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
N/A***
2.AverageReleaseRatefor
Period
uCi/sec
0.00E+01**
0.00E+01
0.00E+01
0.00E+01
3.PercentofTSLimit
%
C.Particulates
1.TotalRelease
Curies
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
N/A***
2.AverageReleaseRatefor
Period
uCi/sec
0.00E+01
0.00E+01
0.00E+01
0.00E+01
3.PercentofTSLimit
%
D.Tritium
1.TotalRelease
Curies
6.94E01
2.25E+00
1.74E+00
4.29E+00
8.97E+00
15%
2.AverageReleaseRatefor
Period
uCi/sec
8.93E02
2.86E01
2.19E01
5.39E01
3.PercentofTechSpecLimit
%
E.Carbon14
1.TotalRelease
Curies
5.68E+00
4.50E+00
5.56E+00
4.54E+00
2.03E+01
2.AverageReleaseRatefor
Period
uCi/sec
7.30E01
5.72E01
6.99E01
5.71E01
3.PercentofTechSpecLimit
%
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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Table1BGaseousEffluents-GroundLevelReleases(Batch)
Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels.
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
1.FissionandActivationGases
Ar41
Ci
1.53E01
7.33E01
1.61E01
2.37E01
1.28E+00
Xe131m
Ci
0.00E+01*
0.00E+01
1.83E03
0.00E+01
1.83E03
Xe133
Ci
1.05E02
6.86E01
3.45E02
2.02E02
7.51E01
Xe135
Ci
0.00E+01
2.64E02
5.10E04
0.00E+01
2.69E02
TotalForPeriod
Ci
1.63E01
1.45E+00
1.98E01
2.57E01
2.06E+00
2.Iodines
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
3.Particulates
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
4.GrossAlpha
GrossAlpha
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
5.Tritium
H3
Ci
7.86E02
1.92E+00
7.05E02
6.14E01
2.68E+00
6.Carbon14
C14
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
SequoyahNuclearPlant
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Table1BGaseousEffluents-GroundLevelReleases(Continuous)
Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels.
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
1.FissionandActivationGases
TotalForPeriod
Ci
0.00E+01*
0.00E+01
0.00E+01
0.00E+01
0.00E+01
2.Iodines
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
3.Particulates
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
4.GrossAlpha
GrossAlpha
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
5.Tritium
H3
Ci
6.15E01
3.34E01
1.67E+00
3.67E+00
6.29E+00
6.Carbon14
C14
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
SequoyahNuclearPlant
Units1and2
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IV.
LiquidEffluents
Table2ALiquidEffluentsSummationofallReleases
ApplicableLimitsareexpressedintermsofdose.SeeTables4AD.
- Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels.
- N/AErrorsinmeasurementarenotreportedforthesevaluessincenonewereidentifiedduring
thereportingperiod.
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Annual
Error%
A.FissionandActivationProducts
1.TotalRelease
Curies
1.45E03
8.69E03
3.36E03
4.51E02
5.86E02
18%
2.AverageDilutedConcentration
uCi/mL
6.58E10
3.30E09
1.35E09
1.79E08
5.95E09
3.PercentofTechSpecLimit
%
B.Tritium
1.TotalRelease
Curies
6.43E+02
4.89E+02
6.21E+02
1.09E+02
1.86E+03
18%
2.AverageDilutedConcentration
uCi/mL
2.92E04
1.86E04
2.49E04
4.33E05
1.89E04
3.PercentofTechSpecLimit
%
C.DissolvedandEntrainedNobleGases
1.TotalRelease
Curies
9.93E04
1.10E03
1.24E03
9.34E05
3.42E03
39%
2.AverageDilutedConcentration
uCi/mL
4.51E10
4.17E10
4.96E10
3.71E11
3.47E10
3.PercentofTechSpecLimit
%
D.GrossAlphaRadioactivity
1.TotalRelease
Curies
0.00E+01**
0.00E+01
0.00E+01
0.00E+01
0.00E+01
N/A***
E.VolumeofLiquidWasteto
DischargeCanal(priorto
dilution)
Liters
1.71E+06
2.60E+06
2.23E+06
2.13E+06
8.66E+06
4%
F.VolumeofDilutionWaterfor
Period
Liters
2.13E+09
2.53E+09
2.38E+09
2.43E+09
9.47E+09
N/A
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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Table2BLiquidEffluents-BatchMode
Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
1.FissionandActivationProducts
Cr51
Ci
- 0.00E+01
3.74E03
2.44E04
9.86E03
1.39E02
Mn54
Ci
3.32E05
5.63E05
3.10E05
9.25E04
1.05E03
Fe55
Ci
1.52E04
1.05E04
5.05E05
0.00E+01
3.07E04
Co58
Ci
9.81E06
7.58E04
2.63E04
6.95E03
7.98E03
Fe59
Ci
0.00E+01
1.54E05
0.00E+01
1.22E04
1.37E04
Co60
Ci
1.06E03
1.73E03
1.34E03
1.32E02
1.73E02
Ni63
Ci
1.30E04
7.55E04
1.12E03
2.51E03
4.52E03
Zn65
Ci
0.00E+01
0.00E+01
1.09E05
1.83E04
1.94E04
Sr91
Ci
0.00E+01
8.97E06
0.00E+01
0.00E+01
8.97E06
Zr95
Ci
0.00E+01
2.41E04
1.23E05
1.40E03
1.66E03
Nb95
Ci
0.00E+01
4.72E04
2.84E05
2.26E03
2.76E03
Nb97
Ci
0.00E+01
1.64E04
5.14E05
7.96E05
2.95E04
Ag110m
Ci
0.00E+01
1.82E04
1.27E05
0.00E+01
1.95E04
Sn113
Ci
0.00E+01
0.00E+01
0.00E+01
2.09E05
2.09E05
Sn117m
Ci
0.00E+01
1.86E05
0.00E+01
4.57E06
2.32E05
Sb122
Ci
0.00E+01
1.83E05
0.00E+01
0.00E+01
1.83E05
Sb124
Ci
0.00E+01
1.66E04
1.95E05
1.23E03
1.41E03
Sb125
Ci
6.03E05
2.32E04
1.69E04
4.87E03
5.33E03
Te129m
Ci
0.00E+01
0.00E+01
0.00E+01
5.66E04
5.66E04
Te131m
Ci
0.00E+01
8.68E06
0.00E+01
0.00E+01
8.68E06
I131
Ci
3.07E06
0.00E+01
0.00E+01
0.00E+01
3.07E06
Te132
Ci
0.00E+01
7.47E06
0.00E+01
0.00E+01
7.47E06
I132
Ci
0.00E+01
6.90E06
0.00E+01
0.00E+01
6.90E06
Cs136
Ci
0.00E+01
3.38E06
0.00E+01
0.00E+01
3.38E06
Cs137
Ci
5.42E06
0.00E+01
0.00E+01
9.73E04
9.78E04
TotalForPeriod
Ci
1.45E03
8.69E03
3.36E03
4.51E02
5.86E02
2.DissolvedandEntrainedGases
Ar41
Ci
0.00E+01
0.00E+01
6.36E05
0.00E+01
6.36E05
Xe133
Ci
9.93E04
1.06E03
1.03E03
8.88E05
3.17E03
Xe135m
Ci
0.00E+01
0.00E+01
0.00E+01
4.60E06
4.60E06
Xe135
Ci
0.00E+01
3.99E05
1.40E04
0.00E+01
1.80E04
TotalForPeriod
Ci
9.93E04
1.10E03
1.24E03
9.34E05
3.42E03
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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Table2BLiquidEffluents-ContinuousMode
Zeroesindicatethatnoradioactivitywaspresentatdetectablelevels
Units
1st
Quarter
2nd
Quarter
3rd
Quarter
4th
Quarter
Total
1.FissionandActivationProducts
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
2.DissolvedandEntrainedGases
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
3.Tritium
TotalForPeriod
Ci
6.16E01
3.34E01
1.67E+00
3.67E+00
6.29E+00
4.GrossAlphaActivity
TotalForPeriod
Ci
0.00E+01
0.00E+01
0.00E+01
0.00E+01
0.00E+01
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
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V.
SolidWasteStorageandShipment
SolidWasteShippedOffsiteforBurialorDisposal(notIrradiatedFuel)
1.TypeofWaste
a. SpentResins,FilterSludges,Evaporator
Bottoms,etc.
b. DryActiveWaste,CompressibleWaste
ContaminatedEquipment,etc.
c. IrradiatedComponents,Control
Rods,etc.
d. Other:GlycolSentforProcessing
Unit
m3
Ci
m3
Ci
m3
Ci
m3
Ci
12Month
Period
5.50
1.60E+01
728
4.56E+00
0.00
0.00E+00
102
2.66E02
Est.Tot.
Error%
+5.00E01
+2.29E+01
+1.00E+01
+2.29E+01
+1.00E+01
+2.29E+01
+1.00E+01
+2.29E+01
Thereportedvolumeforcategoryawasteisbasedonthevolumeofthedisposalcontainer.Waste
volumesforcategoriesb,c,anddarebasedonthenetwastevolumeratherthantheshippingcontainer
volume.Duringtransit,thewasteforcategorybmaysettleresultinginanoverallreducedvolume.The
reductionindisposalvolumeisestimatedtobe10percentduetosettling.Volumeestimatesfor
categorybwasteswerebasedonavisualinspectionofthecontainerscontentsanditspercentfull.
Theestimatedtotalerror(percent)forthetotalCuriesshippedisbasedoncalculatingthesquareroot
ofthesumofthesquaresmethod.Threeparameterswereconsideredasimportantforestimatingthe
error.Theparameterswerevarianceswithsamplepreparationandcountinggeometry,survey
instrumentaccuracyfordosetoCurieevaluations,andinfieldsamplingtechniques.Theassigned
valuesfortheseparameterswere20,10,and5percent,respectively.
Totalerror(%)=(0.202+0.102+0.052)1/2x100=22.9%
SequoyahNuclearPlant
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2021AnnualRadioactiveEffluentReleaseReport
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2.EstimateofMajorNuclideComposition(bytypeofwaste)
a.Spentresins,filtersludges,evaporatorbottoms,etc.(nuclidesdeterminedbymeasurement)
Nuclide
Curies
Percent
1
Hydrogen3
2.38E02
0.02
2
Carbon14
1.67E01
0.14
3
Chromium51
1.43E03
0
4
Manganese54
1.43E+00
1.22
5
Iron55
1.21E+01
10.29
6
Iron59
6.03E04
0
7
Cobalt57
1.88E02
0.02
8
Cobalt58
1.13E01
0.1
9
Cobalt60
5.27E+01
44.86
10
Nickel59
6.78E01
0.58
11
Nickel63
4.58E+01
38.95
12
Zinc65
2.55E01
0.0022
13
Strontium89
2.39E05
0.01
14
Strontium90
1.60E02
0.07
15
Zirconium95
7.82E02
0.15
16
Niobium95
1.71E01
0.01
17
Technitium99
9.89E03
0.0001
18
Silver110m
9.24E04
0
19
Tin113
5.35E03
0
20
Antimony124
3.15E04
0
21
Antimony125
2.44E01
0.21
22
Cesium134
5.67E02
0.05
23
Cesium137
3.55E+00
3.02
24
Cerium144
4.62E02
0.04
25
Plutonium238
1.71E04
0
26
Plutonium239
5.54E05
0
27
Plutonium240
5.54E05
0
28
Plutonium241
5.46E02
0.05
29
Americium241
1.76E04
0
30
Curium242
4.51E05
0
31
Curium243
1.55E04
0
32
Curium244
1.43E04
0
SequoyahNuclearPlant
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b.Dryactivewaste,compressiblewaste,contaminatedequipment,etc.(nuclidesdeterminedby
estimate)
Nuclide
Curies
Percent
1
Hydrogen3
5.16E02
0.08
2
Carbon14
1.81E02
0.03
3
Manganese54
1.74E+00
2.54
4
Iron55
5.28E+01
77.21
5
Cobalt57
1.30E02
0.02
6
Cobalt58
8.96E02
0.13
7
Cobalt60
1.30E+01
19.01
8
Nickel63
1.47E02
0.02
9
Zinc65
3.96E01
0.58
10
Strontium90
2.09E03
0.00
11
Zirconium95
4.54E02
0.07
12
Niobium95
8.74E02
0.13
13
Antimony124
6.90E02
0.10
14
Cesium137
1.88E02
0.03
15
Cerium144
4.15E02
0.06
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c.IrradiatedComponents
Nuclide
Curies
Percent
N/A
N/A
N/A
d.Other
Nuclide
Curies
Percent
1
Hydrogen3
1.13E02
42.31
2
Carbon14
3.15E06
0.01
3
Chromium51
4.65E18
5.49
4
Manganese54
1.46E03
1.13
5
Iron55
3.01E04
35.47
6
Cobalt57
9.45E03
0.01
7
Cobalt58
2.50E06
1.22
8
Cobalt60
3.26E04
8.61
9
Nickel63
2.29E03
0.01
10
Zinc65
2.55E06
0.66
11
Strontium90
1.75E04
0.01
12
Zirconium95
2.77E06
0.10
13
Niobium95
2.56E05
0.18
14
Silver110m
4.70E05
0.51
15
Tin117m
1.37E04
0.03
16
Antimony124
7.57E06
1.28
17
Antimony125
3.41E04
2.66
18
Cesium137
7.08E04
0.09
19
Cerium144
2.49E05
0.22
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3.SolidWasteDisposition
- a.
Spentresins,filtersludges,evaporatorbottoms,etc.
Numberof
Shipments
TypeQuantity
Modeof
Transportation
Destination
1
ALSAII
MotorFreight
EnergySolutionsServices,LLC
CliveDisposalSiteTreatment
FacilityInterstate80,Exit49
Clive,UT84029
1
TypeB
MotorFreight
WasteControlSpecialist,LLC
CompactWasteDisposalFacility
9998W.StateHwy.176
Andrews,TX79714
- b.
Dryactivewaste,compressiblewaste,contaminatedequipment,etc.
Numberof
Shipments
TypeQuantity
Modeof
Transportation
Destination
8
ALSAII
MotorFreight
TOXCOInc.
TOXCOMaterialsManagementCenter
109FlintRd.
OakRidge,TN37830
6
ALSAII
LimitedQuantity
MotorFreight
TOXCOInc.
TOXCOMaterialsManagementCenter
109FlintRd.
OakRidge,TN37830
3
LimitedQuantity
MotorFreight
TOXCOInc.
TOXCOMaterialsManagementCenter
109FlintRd.
OakRidge,TN37830
1
ALSAII
MotorFreight
EnergySolutionsServices,Inc.
1560BearCreekRd.OakRidge,TN
37830
c.Irradiatedcomponents,controlrods,etc.
Numberof
Shipments
TypeQuantity
Modeof
Transportation
Destination
None
N/A
N/A
N/A
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d.Other:Glycolforprocessing
Numberof
Shipments
TypeQuantity
Modeof
Transportation
Destination
3
Exempt
Quantity
MotorFreight
EnergySolutionsServices,Inc.
1560BearCreekRd.Oak
Ridge,TN37830
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4.IrradiatedFuelShipments(Disposition)
NumberofShipments
TypeQuantity
ModeofTransportation
Destination
None
N/A
N/A
N/A
5.SolidificationofWaste
Wassolidificationperformed?No
Ifyes,solidificationmedia:N/A
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VI.
IndependentSpentFuelStorageInstallation
SQNimplementeduseofanindependentspentfuelstorageinstallation(ISFSI)on
July13,2004.10CFR72.214CertificateofCompliance(CoC)Nos.1014and1032correspond
tothetwocertificatesofthespentfuelstoragesystemsinuseattheISFSI.TheISFSIis
locatedonsite,withintheprotectedareaandisdesignedtohold90spentfuelstorage
canisters(SFSCs).CoCNos.1014and1032AppendixAChapter5requiresanannualreport
inaccordancewith10CFR72.44(d)(3).CoCNos.1014and1032Chapter5alsoprovidesthat
theISFSIoperationsmaybeconsideredpartofplantoperationsforthepurposesofthe
radiologicalenvironmentalmonitoringprogram.
CoCNo.1014Section5.4astatesTheHISTORM100CaskSystemdoesnotcreateany
radioactivematerialorhaveanyradioactivewastetreatmentsystems.Therefore,specific
operatingproceduresforthecontrolofradioactiveeffluentsarenotrequired.
Specification3.1.1,MultiPurposeCanister(MPC),providesassurancethattherearenot
radioactiveeffluentsfromSFSC.
CoCNo.1032Section5.1astates,TheHISTORMFWMPCStorageSystemdoesnotcreate
anyradioactivematerialsorhaveanyradioactivewastetreatmentsystems.Therefore,
specificoperatingproceduresforthecontrolofradioactiveeffluentsarenotrequired.
Specification3.1.1,MultiPurposeCanister(MPC),providesassurancethattherearenot
radioactiveeffluentsfromtheSFSC.
TheEnvironmentalProtectionAgencylimitsforthetotaldosetothepublicinthevicinity
ofanuclearpowerplant,establishedintheEnvironmentalDoseStandardof40CFR190,are
asfollows:
TotalBody
25mrem/year
Thyroid
75mrem/year
Anyotherorgan
25mrem/year
AlthoughCoCNos.1014and1032providethattheHISTORM100CaskSystemandHI STORMFWMPCStorageSystemdonotcreateanyradioactivematerialorhaveany
radioactivewastetreatmentsystems,forthisreport,totalsitereleasesincludetheSQNISFSI
aspartoftheSQNsiteandpartofplantoperations.Thesereleasesarewithin40CFR190
limitsand10CFR72.104limits.
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VII. RadiologicalImpacttoMan
A. Introduction
PotentialdosestomaximumindividualsandthepopulationaroundSequoyahNuclear
Plant(SQN)arecalculatedforeachquarterasrequiredinSection5.2oftheOffsiteDose
CalculationManual(ODCM).Measuredplantreleasesforthereportingperiodareusedto
estimatethesedoses.Dispersionofradioactiveeffluentsintheenvironmentisestimated
usingmeteorologicaldataandriverflowdata.Inthisreport,thedosesresultingfrom
releasesaredescribedandcomparedtolimitsestablishedforSQN.
B. DoseLimits
TheODCMspecifieslimitsforthereleaseofradioactiveeffluents,aswellaslimitsfor
dosestothegeneralpublicfromthereleaseofradioactiveeffluents.Theselimitsaresetwell
belowtheTechnicalSpecificationlimitswhichgoverntheconcentrationsofradioactivityand
dosespermissibleinunrestrictedareas.Thisensuresthatradioactiveeffluentreleasesare
AsLowAsReasonablyAchievable.
Thelimitsfordosesinunrestrictedareasfromairbornenoblegasesreleasedare:
x Lessthanorequalto5mradperquarterand10mradperyear(perreactorunit)
forgammaradiation
x Lessthanorequalto10mradperquarterand20mradperyear(perreactorunit)
forbetaradiation.
Thelimitforthedosetoamemberofthegeneralpublicinanunrestrictedareafrom
Iodinesandparticulatesreleasedinairborneeffluentsis:
x Lessthanorequalto7.5mremperquarterand15mremperyear(perreactor
unit)toanyorgan.
Thelimitsfordosestoamemberofthegeneralpublicfromradioactivematerialinliquid
effluentsreleasedtounrestrictedareasare:
x Lessthanorequalto1.5mremperquarterand3mremperyear(perreactor
unit)tothetotalbody
x Lessthanorequalto5mremperquarterand10mremperyear(perreactorunit)
toanyorgan.
TheEnvironmentalProtectionAgencylimitsfortotaldosetothepublicinthevicinityofa
nuclearpowerplant,establishedintheEnvironmentalDoseStandardof40CFR190are:
x Lessthanorequalto25mremperyeartothetotalbody,
x Lessthanorequalto75mremperyeartothethyroid,
x Lessthanorequalto25mremperyeartoanyotherorgan.
C. DoseCalculations
Estimateddosestothepublicaredeterminedusingcomputermodels:GaseousEffluent
LicensingCode(GELC),andtheQuarterlyWaterDoseAssessmentCode(QWATA).These
modelsarebasedonguidanceprovidedbytheNRC(inRegulatoryGuides1.109,1.111and
1.113)fordeterminingthepotentialdosetoindividualsandpopulationslivinginthevicinity
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oftheplant.Theareaaroundtheplantisanalyzedtodeterminethepathwaysthroughwhich
thepublicmayreceiveadose.Thedosescalculatedarearepresentationofthedosetoa
"maximumexposedindividual."Someofthefactorsusedinthesecalculations(suchas
ingestionrates)aremaximumvalues.ManyofthesefactorsareobtainedfromNUREG/CR 1004.Thevalueschosenwilltendtooverestimatethedosetothis"maximum"person.The
expecteddosetoactualindividualsislower.ThecalculateddosesarepresentedinTables3
and4.
D. DosesfromAirborneEffluents
Forairborneeffluents,thepubliccanbeexposedtoradiationfromseveralsources:direct
radiationfromtheradioactivityintheair,directradiationfromradioactivitydepositedonthe
ground,inhalationofairborneradioactivity,ingestionofvegetationwhichcontains
radioactivitydepositedfromtheatmosphere,andingestionofmilkandbeefwhichcontains
radioactivitydepositedfromtheatmosphereontovegetationandsubsequentlyeatenby
milkandbeefanimals.
AirborneDischargePoints
AllreleasesfromSQNareconsideredgroundlevelreleases.ThegroundlevelJoint
FrequencyDistribution(JFD)isderivedfromwindspeedsanddirectionsmeasured10meters
abovegroundandfromtheverticaltemperaturedifferencebetween10and46meters,as
presentedforeachquarterinSectionVIIMeteorologicalData.
MeteorologicalData
MeteorologicalvariablesatSQNaremeasuredcontinuously.Measurementscollected
includewindspeed,winddirection,andtemperatureatheightsof10,46,and91meters
abovetheground.QuarterlyJFDsarecalculatedforeachreleasepointusingtheappropriate
levelsofmeteorologicaldata.AJFDprovidesthepercentageofthetimeinaquarterthatthe
windisblowingoutofaparticularupwindcompasssectorinaparticularrangeofwind
speedsforagivenstabilityclassAthroughG.Thewindspeedsaredividedintoninewind
speedranges.Calmsaredistributedbydirectioninproportiontothedistributionofnoncalm
winddirectionslessthan0.7m/s(1.5mph).Stabilityclassesaredeterminedfromthevertical
temperaturedifferencebetweentwomeasurementlevels.Thisyear,duetoanissueduring
analignmentofasonicsensorusedtodeterminewinddirection,thewinddataforQ42021
waslost.ThisisreflectedinCR#1742782.Dosecalculationsforthisperiodforgaseous
releasesreflecta10yearaveragedatacalculatedfor20092018,asthiswouldmost
accuratelyreflectatheoreticalmodelintheabsenceofempiricalquarterlydata.
ExternalExposureDose
Doseestimatesformaximumexternalairdose(gammaairandbetaairdoses)aremade
forpointsatandbeyondtheunrestrictedareaboundaryasdescribedintheSQNODCM.The
highestofthesedosesisthenselected.
SubmersionDose
Externaldosestotheskinandtotalbody,duetosubmersioninacloudofnoblegases,are
estimatedforthenearestresidenceineachsector.Theresidencewiththehighestdoseis
thenselectedfromallsectors.
OrganDose
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Dosestoorgansduetoreleasesofairborneeffluentsareestimatedfortheinhalation,
groundcontamination,andingestionpathways.Theingestionpathwayisfurtherdividedinto
fourpossiblecontributingpathways:ingestionofcowmilk,ingestionofbeef,andingestion
ofvegetables.Dosesfromapplicablepathwaysarecalculatedforeachrealreceptorlocation
identifiedinthemostrecentlandusesurvey.Todeterminethemaximumorgandose,the
dosesfromthepathwaysaresummedforeachreceptor.Fortheingestiondose,however,
onlythosepathwaysthatexistforeachreceptorareconsideredinthesum,i.e.,milk
ingestiondosesareincludedonlyforlocationswheremilkisconsumedwithoutcommercial
preparationandvegetableingestionisincludedonlyforthoselocationswhereagardenis
identified.Toconservativelyaccountforbeefingestion,abeefingestiondoseequaltothat
forthehighestunrestrictedareaboundarylocationisaddedtoeachidentifiedreceptor.For
groundcontamination,thedoseaddedtotheorgandosebeingcalculatedisthetotalbody
dosecalculatedforthatlocation,i.e.,itisassumedthatthedosetoanindividualorganis
equaltothetotalbodydose.
DosesfromairborneeffluentsarepresentedinTable3.
E. DosesfromLiquidEffluents
Forliquideffluents,thepubliccanbeexposedtoradiationfromthreesources:the
ingestionofwaterfromtheTennesseeRiver,theingestionoffishcaughtintheTennessee
River,anddirectexposurefromradioactivematerialdepositedontherivershoreline
sediment(recreation).
TheconcentrationsofradioactivityintheTennesseeRiverareestimatedbyacomputer
modelwhichusesmeasuredhydraulicdatadownstreamofSQN.Parametersusedto
determinethedosesarebasedonguidancegivenbytheNRC(inRegulatoryGuide1.109)for
maximumingestionrates,exposuretimes,etc.Whereverpossible,parametersusedinthe
dosecalculationaresitespecificusefactorsdeterminedbyTVA.Themodelsthatareusedto
estimatedoses,aswellastheparametersinputtothemodels,aredescribedindetailinthe
SQNODCM.
LiquidReleasePointsandRiverData
RadioactivityconcentrationsintheTennesseeRiverarecalculatedassumingthatreleases
inliquideffluentsarecontinuous.RoutineliquidreleasesfromSQN,locatedatTennessee
RiverMile484,aremadethroughdiffuserswhichextendintotheTennesseeRiver.Itis
assumedthatreleasestotheriverthroughthesediffuserswillinitiallybeentrainedinone fifthofthewaterwhichflowspasttheplant.TheQWATAcodeassumesthatthismixing
conditionholdstrueuntilthewateriscompletelymixedatthefirstdownstreamdam,at
TennesseeRiverMile471.
Dosesarecalculatedforlocationswithina50mileradiusdownstreamoftheplantsite.
Themaximumpotentialrecreationdoseiscalculatedforalocationimmediatelydownstream
fromtheplantoutfall.Themaximumindividualdosefromingestionoffishisassumedtobe
thatcalculatedfortheconsumptionoffishcaughtanywherebetweentheplantandthefirst
downstreamdam(ChickamaugaDam).Themaximumindividualdosefromdrinkingwateris
assumedtobethatcalculatedatthenearestdownstreampublicwatersupply(EastSide
Utilities).Thiscouldbeinterpretedasindicatingthatthemaximumindividual,asassumedfor
liquidreleasesfromSequoyah,isanindividualwhoobtainsallofhisdrinkingwateratEast
SideUtilities,consumesfishcaughtfromtheTennesseeRiverbetweenSQNand
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ChickamaugaDam,andspends500hoursperyearontheshorelinejustbelowtheoutfall
fromSequoyah.Doseestimatesforthemaximumindividualduetoliquideffluentsforeach
quarterintheperiodarepresentedinTable4,alongwiththeaverageriverflowspastthe
plantsitefortheperiods.
Populationdosesarecalculatedassumingthateachindividualconsumesmilk,vegetables,
andmeatproducedwithinthesectorannulusinwhichheresides.Dosesfromexternal
pathwaysandinhalationarebasedonthe50milehumanpopulationdistribution.
F. PopulationDoses
Populationdosesforhighestexposedorganduetoairborneeffluentsarecalculatedfor
anestimated1,060,000personslivingwithina50mileradiusoftheplantsite.Dosesfrom
externalpathwaysandinhalationarebasedonthe50milehumanpopulationdistribution.
Ingestionpopulationdosesfortotalbodyandthemaximumexposedorganduetoliquid
effluentsarecalculatedfortheentiredownstreamTennesseeRiverpopulation.Water
ingestionpopulationdosesarecalculatedusingactualpopulationfiguresfordownstream
publicwatersupplies.Fishingestionpopulationdosesarecalculatedassumingthatallsport
fishcaughtintheTennesseeRiverareconsumedbytheTennesseeRiverpopulation.
Recreationpopulationdosesarecalculatedusingactualrecreationaldataonthenumberof
shorelinevisitsatdownstreamlocations.
PopulationdoseestimatesforairborneandliquideffluentsarepresentedinTables3and
4.
G. OffsiteDirectRadiationDose
ExternalgammaradiationlevelsweremeasuredbydosimetersdeployedaroundSQNas
partoftheoffsiteREMP.Thequarterlygammaradiationlevelsdeterminedfromthese
dosimetersduringthisreportingperiodaveragedapproximately15.0mrem/quarteratonsite
(atornearthesiteboundary)stationsandapproximately14.2mrem/quarteratoffsite
stations,orapproximately0.8mrem/quarterhigheronsitethanatoffsitestations.This
differenceisconsistentwithlevelsmeasuredforpreoperationalandconstructionphasesof
theTVAnuclearplantsitewheretheaverageradiationlevelsonsiteweregenerally13
mrem/quarterhigherthanthelevelsoffsite.Thismaybeattributabletonaturalvariationsin
environmentalradiationlevels,earthmovingactivitiesonsite,themassofconcrete
employedintheconstructionoftheplants,orotherundeterminedinfluences.Fluctuations
innaturalbackgrounddoseratesandindosimetersreadingstendtomaskanysmall
incrementswhichmaybeduetoplantoperations.Thus,therewasnoidentifiableincreasein
doseratelevelsattributabletodirectradiationfromplantequipmentand/orgaseous
effluents.
H. DosetoaMemberofthePublicInsidetheSiteBoundary
AsstatedintheSQNODCM,anevaluationofthedosetoamemberofthepublicinside
theunrestrictedareaboundaryisperformedforahypotheticalTVAemployeewhoworks
justoutsidetherestrictedareaboundaryforanentireworkyear(2000hours).Resultsfrom
onsitedosimetermeasurementsfor2021indicatethatthehighestonsitedosimeterreading
was20mremaftersubtractionoftheannualbackgroundvalueof49mrem/year(from
perimeterdosimetersaroundSequoyah).Usingthisvalueandmultiplyingbytheratioofthe
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occupancytimes(2000/8760),theexternaldosewas4.57mrem.Thedosesdueto
radioactiveeffluentsreleasedtotheatmospherecalculatedinthisreportwouldnotadda
significantamounttothismeasureddose.Thisdoseiswellbelowthe10CFR20annuallimit
of100mrem.
I. TotalDose
Todeterminecompliancewith40CFR190,annualtotaldosecontributionstothe
maximumindividualfromSQNradioactiveeffluentsandothernearbyuraniumfuelcycle
sourcesareconsidered.
Theannualdosetoanyorganotherthanthyroidforthemaximumindividualis
conservativelyestimatedbysummingthefollowingdoses:thetotalbodyairsubmersion
doseforeachquarter,thecriticalorgandose(foranyorganotherthanthethyroid)from
airborneeffluentsforeachquarterfromgroundcontamination,inhalationandingestion,the
totalbodydosefromliquideffluentsforeachquarter,themaximumorgandose(forany
organotherthanthethyroid)fromliquideffluentsforeachquarter,andanyidentifiable
increaseindirectradiationdoselevelsasmeasuredbytheenvironmentalmonitoring
program.Thisdoseiscomparedtothe40CFR190limitfortotalbodyoranyorgandose
(otherthanthyroid)todeterminecompliance.
Theannualthyroiddosetothemaximumindividualisconservativelyestimatedby
summingthefollowingdoses:thetotalbodyairsubmersiondoseforeachquarter,the
thyroiddosefromairborneeffluentsforeachquarter,thetotalbodydosefromliquid
effluentsforeachquarter,thethyroiddosefromliquideffluentsforeachquarter,andany
identifiableincreaseindirectradiationdoselevelsasmeasuredbytheenvironmental
monitoringprogram.Thisdoseiscomparedtothe40CFR190limitforthyroiddoseto
determinecompliance.
CumulativeannualtotaldosesarepresentedinTable5.
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J. Tables
Table3ADosesfromAirborneEffluents-1stQuarter
IndividualDoses
Pathway
Dose
QuarterlyLimit
Percentof
Limit
Location
External
GammaAir
1.34E04
5mrad
<1%
SSW/1840/meters
BetaAir
4.84E05
10mrad
<1%
SSW/1840/meters
Submersion
TotalBody
1.00E04
10mrad
<1%
SSW/2129/meters
Skin
1.48E04
10mrad
<1%
SSW/2129/meters
OrganDoses
(Iodine,Tritium,Particulateswith>8Dayhalflife)
Child/Bone
(Max)
2.99E01
7.5mrem
4.0%
NNE/3770/meters
Child/Thyroid
6.00e02
7.5mrem
<1%
NNE/3770/meters
Child/Total
Body
6.00E02
7.5mrem
<1%
NNE/3770/meters
PopulationDoses
TotalBodyDose
3.36E01manrem
MaximumOrganDose(Organ)
1.67E+00manrem(Bone)
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Table3BDosesfromAirborneEffluents-2ndQuarter
IndividualDoses
Pathway
Dose
QuarterlyLimit
Percentof
Limit
Location
External
GammaAir
1.29E03
5mrad
<1%
N/950/meters
BetaAir
5.95E04
10mrad
<1%
N/950/meters
Submersion
TotalBody
8.92E04
10mrad
<1%
NNW/864/meters
Skin
1.35E03
10mrad
<1%
NNW/864/meters
OrganDoses
(Iodine,Tritium,Particulateswith>8Dayhalflife)
Child/Bone
(Max)
4.64E01
7.5mrem
6.2%
WSW/1152/meters
Child/Thyroid
9.41E02
7.5mrem
1.3%
WSW/1152/meters
Child/Total
Body
9.41E02
7.5mrem
1.3%
WSW/1152/meters
PopulationDoses
TotalBodyDose
4.61E01manrem
MaximumOrganDose(Organ)
2.26E+00manrem(Bone)
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Table3CDosesfromAirborneEffluents-3rdQuarter
IndividualDoses
Pathway
Dose
QuarterlyLimit
Percentof
Limit
Location
External
GammaAir
2.88E04
5mrad
<1%
S/1570/meters
BetaAir
1.10E04
10mrad
<1%
S/1570/meters
Submersion
TotalBody
2.25E04
10mrad
<1%
S/1764/meters
Skin
3.33E04
10mrad
<1%
S/1764/meters
OrganDoses
(Iodine,Tritium,Particulateswith>8Dayhalflife)
Child/Bone
(Max)
4.84E01
7.5mrem
6.5%
S/4010/meters
Child/Thyroid
9.73e02
7.5mrem
1.3%
S/4010/meters
Child/Total
Body
9.73e02
7.5mrem
1.3%
S/4010/meters
PopulationDoses
TotalBodyDose
4.78E01manrem
MaximumOrganDose(Organ)
2.36E+00manrem(Bone)
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Table3DDosesfromAirborneEffluents-4thQuarter
IndividualDoses
Pathway
Dose
QuarterlyLimit
Percentof
Limit
Location
External
GammaAir
3.19E04
5mrad
<1%
N/950/meters
BetaAir
1.16E04
10mrad
<1%
N/950/meters
Submersion
TotalBody
1.83E04
10mrad
<1%
SSW/2129/meters
Skin
2.70E04
10mrad
<1%
SSW/2129/meters
OrganDoses
(Iodine,Tritium,Particulateswith>8Dayhalflife)
Child/Bone
(Max)
2.69E01
7.5mrem
3.6%
SSW/4363/meters
Child/Thyroid
5.48e02
7.5mrem
<1%
WSW/1152/meters
Child/Total
Body
5.48E02
7.5mrem
<1%
WSW/1152/meters
PopulationDoses
TotalBodyDose
3.91e01manrem
MaximumOrganDose(Organ)
1.88e+00manrem(Bone)
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Table4ADosesfromLiquidEffluents-1stQuarter
IndividualDoses
AgeGroup
Organ
Dose
QuarterlyLimit
PercentofLimit
Child(Max)
Bone/GIT/Liver
Kidney/Lung
1.40E03
5mrem
<1%
Child
Thyroid
1.40E03
5mrem
<1%
Child
TotalBody
1.40E03
1.5mrem
<1%
AverageRiverflowpastSQN(cubicfeetpersecond):55,371
PopulationDoses
TotalBodyDose
1.20E01manrem
MaximumOrganDose(Organ)
1.20E01manrem(Bone/GIT/Thyroid/Liver/Kidney/Lung)
Table4BDosesfromLiquidEffluents-2ndQuarter
IndividualDoses
AgeGroup
Organ
Dose
QuarterlyLimit
PercentofLimit
Child(Max)
Bone/GIT
2.00E03
5mrem
<1%
Child/Infant
Thyroid
1.90E03
5mrem
<1%
Child/Infant
TotalBody
1.90E03
1.5mrem
<1%
AverageRiverflowpastSQN(cubicfeetpersecond):30,838
PopulationDoses
TotalBodyDose
1.70E01manrem
MaximumOrganDose(Organ)
1.70E01manrem(Bone/GIT/Thyroid/Liver/Kidney/Lung)
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Table4CDosesfromLiquidEffluents-3rdQuarter
IndividualDoses
AgeGroup
Organ
Dose
QuarterlyLimit
PercentofLimit
Child
Bone/GIT/Liver
Kidney/Lung
2.30E03
5mrem
<1%
Child
Thyroid
2.30E03
5mrem
<1%
Child
TotalBody
2.30E03
1.5mrem
<1%
AverageRiverflowpastSQN(cubicfeetpersecond):32,432
PopulationDoses
TotalBodyDose
2.00E01manrem
MaximumOrganDose(Organ)
2.00E01manrem(Bone/GIT/Thyroid/Liver/Kidney/Lung)
Table4DDosesfromLiquidEffluents-4thQuarter
IndividualDoses
AgeGroup
Organ
Dose
QuarterlyLimit
PercentofLimit
Adult
GIT
2.40E03
5mrem
<1%
Child
Thyroid
7.30E04
5mrem
<1%
Adult
TotalBody
8.10E04
1.5mrem
<1%
AverageRiverflowpastSQN(cubicfeetpersecond):33,875
PopulationDoses
TotalBodyDose
1.10E01manrem
MaximumOrganDose(Organ)
1.20E01manrem(GIT)
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
RadiologicalImpact
40
Table5TotalDosefromFuelCycle
Dose
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
TotalBodyoranyOrgan(exceptthyroid)
Totalbodyair
(submersion)
1.00E04
8.92E04
2.25E04
1.83E04
Criticalorgan
dose
(airborne)
2.99E01
4.64E01
4.84E01
2.69E01
Totalbody
dose(liquid)
1.40E03
1.90E03
2.30E03
8.10E04
Maximum
organdose
(liquid)
1.40E03
2.00E03
2.30E03
2.40E03
Direct
Radiation
Dose
0.00E+01
0.00E+01
0.00E+01
0.00E+01
Total
3.02E01
4.69E01
4.89E01
2.72E01
CumulativeTotalDose(mrem)
1.53
AnnualDoseLimit(mrem)
25
PercentofLimit
6.13
Thyroid
Totalbodyair
(submersion)
1.00E04
8.92E04
2.25E04
1.83E04
Thyroiddose
(airborne)
6.00e02
9.41E02
9.73e02
5.48e02
Totalbody
dose(liquid)
1.40E03
1.90E03
2.30E03
8.10E04
Thyroiddose
(liquid)
1.40E03
1.90E03
2.30E03
7.30E04
Total
6.29E02
9.88E02
1.02E01
5.65E02
CumulativeTotalDose(mrem)
3.20E01
AnnualDoseLimit(mrem)
75
PercentofLimit
<1
SequoyahNuclearPlant
Units1and2
2021AnnualRadioactiveEffluentReleaseReport
MeteorologicalData
41
VIII.JointFrequencyDistributionTables
42
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.101 0.151 0.101 0.000 0.000 0.000 0.352 NNE 0.000 0.000 0.050 0.201 0.352 0.251 0.000 0.000 0.000 0.854 NE 0.000 0.000 0.000 0.151 0.302 0.050 0.000 0.000 0.000 0.503 ENE 0.000 0.000 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.101 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.151 0.000 0.000 0.000 0.151 SSW 0.000 0.000 0.000 0.050 0.050 0.251 0.000 0.000 0.000 0.352 SW 0.000 0.000 0.000 0.000 0.050 0.050 0.000 0.000 0.000 0.101 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.050 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.101 0.000 0.201 0.000 0.000 0.000 0.302 SUBTOTAL 0.000 0.000 0.050 0.704 0.955 1.055 0.000 0.000 0.000 2.764 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS A 57 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 55 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 6.97 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
43
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.050 0.302 0.201 0.000 0.000 0.000 0.553 NNE 0.000 0.000 0.000 0.402 0.452 0.402 0.000 0.000 0.000 1.256 NE 0.000 0.000 0.050 0.101 0.050 0.151 0.000 0.000 0.000 0.352 ENE 0.000 0.000 0.000 0.050 0.050 0.000 0.000 0.000 0.000 0.101 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.050 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.000 0.000 0.000 0.151 0.000 0.000 0.000 0.151 SSW 0.000 0.000 0.000 0.000 0.101 0.653 0.000 0.000 0.000 0.754 SW 0.000 0.000 0.000 0.050 0.050 0.201 0.000 0.000 0.000 0.302 WSW 0.000 0.000 0.000 0.000 0.050 0.101 0.000 0.000 0.000 0.151 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.050 NW 0.000 0.000 0.000 0.000 0.000 0.101 0.000 0.000 0.000 0.101 NNW 0.000 0.000 0.000 0.000 0.101 0.101 0.000 0.000 0.000 0.201 SUBTOTAL 0.000 0.000 0.101 0.653 1.206 2.060 0.000 0.000 0.000 4.020 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS B 85 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 80 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 7.25 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
44
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.101 0.000 0.302 0.151 0.000 0.000 0.000 0.553 NNE 0.000 0.000 0.050 0.302 0.402 0.452 0.050 0.000 0.000 1.256 NE 0.000 0.000 0.101 0.151 0.151 0.050 0.000 0.000 0.000 0.452 ENE 0.000 0.000 0.050 0.050 0.000 0.000 0.000 0.000 0.000 0.101 E 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.050 ESE 0.000 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.050 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.101 0.050 0.000 0.000 0.000 0.000 0.000 0.151 S 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSW 0.000 0.000 0.050 0.101 0.201 0.251 0.000 0.000 0.000 0.603 SW 0.000 0.000 0.000 0.101 0.101 0.050 0.000 0.000 0.000 0.251 WSW 0.000 0.000 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.050 W 0.000 0.000 0.000 0.050 0.050 0.000 0.000 0.000 0.000 0.101 WNW 0.000 0.000 0.050 0.050 0.000 0.050 0.000 0.000 0.000 0.151 NW 0.000 0.000 0.000 0.101 0.101 0.151 0.000 0.000 0.000 0.352 NNW 0.000 0.000 0.000 0.050 0.050 0.151 0.000 0.000 0.000 0.251 SUBTOTAL 0.000 0.000 0.553 1.106 1.357 1.307 0.050 0.000 0.000 4.372 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS C 91 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 87 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 6.36 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
45
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.101 1.256 2.915 2.462 1.608 0.000 0.000 0.000 8.342 NNE 0.000 0.050 1.256 3.819 4.322 3.769 0.000 0.000 0.000 13.216 NE 0.000 0.000 0.704 0.352 0.101 0.050 0.000 0.000 0.000 1.206 ENE 0.000 0.000 0.402 0.101 0.000 0.000 0.000 0.000 0.000 0.503 E 0.000 0.000 0.151 0.050 0.000 0.000 0.000 0.000 0.000 0.201 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.151 0.000 0.000 0.000 0.000 0.000 0.000 0.151 SSE 0.000 0.000 0.251 0.050 0.050 0.000 0.000 0.000 0.000 0.352 S 0.000 0.000 0.201 0.754 0.151 0.553 0.050 0.000 0.000 1.709 SSW 0.000 0.000 1.055 2.362 1.910 0.804 0.000 0.000 0.000 6.131 SW 0.000 0.000 1.307 1.357 1.055 0.352 0.000 0.000 0.000 4.070 WSW 0.000 0.000 0.201 1.005 0.553 0.201 0.000 0.000 0.000 1.960 W 0.000 0.000 0.151 0.603 1.307 0.804 0.000 0.000 0.000 2.864 WNW 0.000 0.050 0.201 0.302 0.553 0.302 0.000 0.000 0.000 1.407 NW 0.000 0.000 0.201 0.553 0.854 0.352 0.000 0.000 0.000 1.960 NNW 0.000 0.000 0.352 0.704 1.457 1.357 0.000 0.000 0.000 3.869 SUBTOTAL 0.000 0.201 7.839 14.925 14.774 10.151 0.050 0.000 0.000 47.940 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS D 1009 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 954 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 5.62 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
46
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.151 1.156 0.653 0.201 0.201 0.000 0.000 0.000 2.362 NNE 0.000 0.302 2.462 2.312 0.653 0.251 0.000 0.000 0.000 5.980 NE 0.000 0.151 0.402 0.101 0.000 0.000 0.000 0.000 0.000 0.653 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.050 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.101 ESE 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.050 SE 0.000 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.101 SSE 0.000 0.101 0.101 0.000 0.050 0.000 0.000 0.000 0.000 0.251 S 0.000 0.050 0.503 0.251 0.251 1.055 0.000 0.000 0.000 2.111 SSW 0.000 0.000 1.960 1.658 1.106 0.201 0.000 0.000 0.000 4.925 SW 0.000 0.050 1.307 1.457 0.251 0.050 0.000 0.000 0.000 3.116 WSW 0.000 0.050 0.402 0.402 0.151 0.050 0.000 0.000 0.000 1.055 W 0.000 0.000 0.050 0.402 0.352 0.000 0.000 0.000 0.000 0.804 WNW 0.000 0.000 0.251 0.101 0.452 0.000 0.000 0.000 0.000 0.804 NW 0.000 0.000 0.452 0.352 0.302 0.000 0.000 0.000 0.000 1.106 NNW 0.000 0.151 0.653 0.754 0.101 0.000 0.000 0.000 0.000 1.658 SUBTOTAL 0.000 1.106 9.849 8.442 3.869 1.809 0.000 0.000 0.000 25.075 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS E 546 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 499 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 4.13 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
47
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.151 0.905 0.101 0.000 0.000 0.000 0.000 0.000 1.156 NNE 0.000 0.050 1.809 0.101 0.000 0.000 0.000 0.000 0.000 1.960 NE 0.000 0.352 0.653 0.000 0.000 0.000 0.000 0.000 0.000 1.005 ENE 0.000 0.101 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.151 E 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.101 ESE 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.101 SE 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.050 SSE 0.000 0.101 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.151 S 0.000 0.201 0.101 0.101 0.000 0.000 0.000 0.000 0.000 0.402 SSW 0.000 0.000 1.508 0.503 0.251 0.151 0.000 0.000 0.000 2.412 SW 0.000 0.000 1.457 0.503 0.151 0.050 0.000 0.000 0.000 2.161 WSW 0.000 0.050 0.402 0.000 0.000 0.000 0.000 0.000 0.000 0.452 W 0.000 0.000 0.101 0.050 0.050 0.000 0.000 0.000 0.000 0.201 WNW 0.000 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.101 NW 0.000 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.101 NNW 0.000 0.000 0.352 0.000 0.000 0.000 0.000 0.000 0.000 0.352 SUBTOTAL 0.000 1.256 7.588 1.357 0.452 0.201 0.000 0.000 0.000 10.854 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS F 244 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 216 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 2.70 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
48
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2021 - MAR 31, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.001 0.000 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.102 NNE 0.007 0.101 0.402 0.000 0.000 0.000 0.000 0.000 0.000 0.509 NE 0.005 0.000 0.352 0.000 0.000 0.000 0.000 0.000 0.000 0.356 ENE 0.001 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.051 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.001 0.101 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.102 S 0.004 0.050 0.251 0.000 0.000 0.000 0.000 0.000 0.000 0.305 SSW 0.020 0.352 1.206 0.603 0.151 0.000 0.000 0.000 0.000 2.332 SW 0.007 0.000 0.503 0.101 0.000 0.000 0.000 0.000 0.000 0.610 WSW 0.001 0.000 0.050 0.050 0.000 0.000 0.000 0.000 0.000 0.101 W 0.001 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.051 WNW 0.001 0.000 0.050 0.151 0.000 0.000 0.000 0.000 0.000 0.202 NW 0.001 0.050 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.051 NNW 0.003 0.050 0.151 0.000 0.000 0.000 0.000 0.000 0.000 0.204 SUBTOTAL 0.050 0.704 3.166 0.905 0.151 0.000 0.000 0.000 0.000 4.975 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2155 TOTAL HOURS OF STABILITY CLASS G 123 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 99 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 1990 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/04/26 MEAN WIND SPEED = 2.44 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
49
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.276 0.414 0.000 0.000 0.000 0.690 NNE 0.000 0.000 0.000 0.506 0.506 0.460 0.000 0.000 0.000 1.472 NE 0.000 0.000 0.000 0.690 0.414 0.184 0.000 0.000 0.000 1.288 ENE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SSE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 S 0.000 0.000 0.000 0.046 0.184 0.000 0.000 0.000 0.000 0.230 SSW 0.000 0.000 0.000 0.138 0.322 0.184 0.000 0.000 0.000 0.644 SW 0.000 0.000 0.000 0.368 0.092 0.000 0.000 0.000 0.000 0.460 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.046 NNW 0.000 0.000 0.000 0.000 0.230 0.276 0.000 0.000 0.000 0.506 SUBTOTAL 0.000 0.000 0.000 1.840 2.070 1.564 0.000 0.000 0.000 5.474 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS A 119 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 119 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 6.56 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
50
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.138 0.138 0.184 0.046 0.000 0.000 0.506 NNE 0.000 0.000 0.000 0.736 0.230 0.046 0.000 0.000 0.000 1.012 NE 0.000 0.000 0.092 0.874 0.000 0.000 0.000 0.000 0.000 0.966 ENE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 E 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.092 0.092 0.000 0.000 0.000 0.000 0.184 S 0.000 0.000 0.000 0.092 0.092 0.000 0.000 0.000 0.000 0.184 SSW 0.000 0.000 0.000 0.138 0.644 0.138 0.000 0.000 0.000 0.920 SW 0.000 0.000 0.000 0.368 0.138 0.046 0.000 0.000 0.000 0.552 WSW 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.092 W 0.000 0.000 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.138 WNW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.046 0.000 0.046 0.322 0.000 0.000 0.000 0.414 SUBTOTAL 0.000 0.000 0.230 2.622 1.518 0.736 0.046 0.000 0.000 5.152 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS B 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 112 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 5.51 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
51
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.092 0.000 0.138 0.000 0.000 0.000 0.276 NNE 0.000 0.000 0.046 0.506 0.184 0.046 0.000 0.000 0.000 0.782 NE 0.000 0.000 0.322 0.552 0.092 0.000 0.000 0.000 0.000 0.966 ENE 0.000 0.000 0.230 0.092 0.000 0.000 0.000 0.000 0.000 0.322 E 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.092 0.138 0.000 0.000 0.000 0.000 0.230 S 0.000 0.000 0.092 0.460 0.368 0.046 0.000 0.000 0.000 0.966 SSW 0.000 0.000 0.230 0.828 0.552 0.092 0.000 0.000 0.000 1.702 SW 0.000 0.000 0.138 0.276 0.230 0.046 0.000 0.000 0.000 0.690 WSW 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.092 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.092 NW 0.000 0.000 0.000 0.000 0.092 0.046 0.000 0.000 0.000 0.138 NNW 0.000 0.000 0.000 0.000 0.046 0.184 0.000 0.000 0.000 0.230 SUBTOTAL 0.000 0.000 1.288 2.990 1.794 0.598 0.000 0.000 0.000 6.670 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS C 145 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 145 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 5.03 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
52
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.092 0.736 0.782 0.828 0.322 0.000 0.000 0.000 2.760 NNE 0.000 0.092 1.150 1.472 1.012 0.506 0.000 0.000 0.000 4.232 NE 0.000 0.046 1.242 0.598 0.184 0.000 0.000 0.000 0.000 2.070 ENE 0.000 0.092 0.368 0.000 0.000 0.000 0.000 0.000 0.000 0.460 E 0.000 0.046 0.276 0.184 0.000 0.000 0.000 0.000 0.000 0.506 ESE 0.000 0.000 0.368 0.000 0.000 0.000 0.000 0.000 0.000 0.368 SE 0.000 0.092 0.368 0.230 0.000 0.000 0.000 0.000 0.000 0.690 SSE 0.000 0.046 0.414 0.828 0.092 0.000 0.000 0.000 0.000 1.380 S 0.000 0.000 2.300 3.128 0.828 0.368 0.000 0.000 0.000 6.624 SSW 0.000 0.000 3.312 3.864 0.920 0.506 0.000 0.000 0.000 8.602 SW 0.000 0.000 1.748 2.346 0.414 0.138 0.000 0.000 0.000 4.646 WSW 0.000 0.000 0.460 0.276 0.138 0.046 0.000 0.000 0.000 0.920 W 0.000 0.000 0.276 0.046 0.000 0.000 0.000 0.000 0.000 0.322 WNW 0.000 0.046 0.046 0.092 0.092 0.000 0.000 0.000 0.000 0.276 NW 0.000 0.046 0.092 0.276 0.414 0.138 0.000 0.000 0.000 0.966 NNW 0.000 0.092 0.230 0.322 0.598 0.184 0.000 0.000 0.000 1.426 SUBTOTAL 0.000 0.690 13.385 14.443 5.520 2.208 0.000 0.000 0.000 36.247 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS D 788 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 788 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 4.19 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
53
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.007 0.460 2.668 0.690 0.322 0.092 0.000 0.000 0.000 4.239 NNE 0.008 0.874 2.484 0.736 0.092 0.000 0.000 0.000 0.000 4.193 NE 0.001 0.000 0.230 0.046 0.000 0.000 0.000 0.000 0.000 0.277 ENE 0.001 0.276 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.507 E 0.001 0.138 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.277 ESE 0.001 0.138 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.323 SE 0.001 0.138 0.414 0.046 0.000 0.000 0.000 0.000 0.000 0.599 SSE 0.002 0.230 0.736 0.230 0.046 0.000 0.000 0.000 0.000 1.244 S 0.004 0.506 1.334 0.506 0.138 0.046 0.000 0.000 0.000 2.534 SSW 0.007 0.414 2.668 0.644 0.046 0.000 0.000 0.000 0.000 3.779 SW 0.006 0.230 2.392 0.736 0.138 0.000 0.000 0.000 0.000 3.502 WSW 0.002 0.046 0.690 0.184 0.000 0.000 0.000 0.000 0.000 0.922 W 0.001 0.184 0.414 0.046 0.046 0.000 0.000 0.000 0.000 0.691 WNW 0.001 0.046 0.230 0.230 0.046 0.046 0.000 0.000 0.000 0.599 NW 0.002 0.276 0.598 0.322 0.230 0.000 0.000 0.000 0.000 1.428 NNW 0.002 0.138 0.736 0.644 0.092 0.046 0.000 0.000 0.000 1.658 SUBTOTAL 0.046 4.094 16.145 5.060 1.196 0.230 0.000 0.000 0.000 26.771 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS E 582 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 582 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 2.74 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
54
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.005 0.092 1.426 0.276 0.000 0.000 0.000 0.000 0.000 1.798 NNE 0.015 1.288 3.634 0.000 0.000 0.000 0.000 0.000 0.000 4.936 NE 0.008 1.196 1.472 0.000 0.000 0.000 0.000 0.000 0.000 2.676 ENE 0.002 0.598 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.600 E 0.001 0.184 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.277 ESE 0.001 0.230 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.323 SE 0.002 0.460 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.554 SSE 0.002 0.552 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.692 S 0.002 0.230 0.368 0.000 0.000 0.000 0.000 0.000 0.000 0.600 SSW 0.003 0.184 0.782 0.092 0.000 0.000 0.000 0.000 0.000 1.061 SW 0.004 0.046 1.196 0.000 0.000 0.000 0.000 0.000 0.000 1.246 WSW 0.001 0.092 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.369 W 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 WNW 0.000 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.092 NW 0.000 0.046 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.138 NNW 0.001 0.000 0.414 0.138 0.000 0.000 0.000 0.000 0.000 0.553 SUBTOTAL 0.046 5.198 10.212 0.506 0.000 0.000 0.000 0.000 0.000 15.961 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS F 347 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 347 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 1.79 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
55
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT APR 1, 2021 - JUN 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.138 0.000 0.000 0.000 0.000 0.000 0.000 0.138 NNE 0.000 0.230 0.460 0.000 0.000 0.000 0.000 0.000 0.000 0.690 NE 0.000 0.230 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.506 ENE 0.000 0.276 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.368 E 0.000 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.092 ESE 0.000 0.230 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.230 SE 0.000 0.414 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.414 SSE 0.000 0.368 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.414 S 0.000 0.276 0.092 0.000 0.000 0.000 0.000 0.000 0.000 0.368 SSW 0.000 0.000 0.276 0.000 0.000 0.000 0.000 0.000 0.000 0.276 SW 0.000 0.046 0.184 0.000 0.000 0.000 0.000 0.000 0.000 0.230 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 2.162 1.564 0.000 0.000 0.000 0.000 0.000 0.000 3.726 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2174 TOTAL HOURS OF STABILITY CLASS G 81 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 81 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2174 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/07/23 MEAN WIND SPEED = 1.47 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
56
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.046 0.232 0.093 0.093 0.000 0.000 0.000 0.464 NNE 0.000 0.000 0.232 1.020 0.556 0.139 0.000 0.000 0.000 1.947 NE 0.000 0.000 0.139 0.278 0.046 0.000 0.000 0.000 0.000 0.464 ENE 0.000 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.093 E 0.000 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.093 ESE 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.093 SE 0.000 0.046 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.093 SSE 0.000 0.000 0.093 0.139 0.093 0.093 0.000 0.000 0.000 0.417 S 0.000 0.046 0.000 0.139 0.139 0.000 0.000 0.000 0.000 0.325 SSW 0.000 0.000 0.139 0.000 0.371 0.000 0.000 0.000 0.000 0.510 SW 0.000 0.000 0.000 0.232 0.000 0.000 0.000 0.000 0.000 0.232 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.093 NW 0.000 0.046 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.093 NNW 0.000 0.000 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.046 SUBTOTAL 0.000 0.139 0.834 2.133 1.530 0.371 0.000 0.000 0.000 5.007 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS A 110 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 108 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 4.82 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
57
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.139 0.232 0.000 0.046 0.000 0.000 0.000 0.417 NNE 0.000 0.000 0.093 0.742 0.232 0.046 0.000 0.000 0.000 1.113 NE 0.000 0.000 0.325 0.232 0.000 0.000 0.000 0.000 0.000 0.556 ENE 0.000 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.000 0.139 E 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 ESE 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SE 0.000 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.185 SSE 0.000 0.000 0.093 0.000 0.093 0.000 0.000 0.000 0.000 0.185 S 0.000 0.000 0.046 0.093 0.093 0.000 0.000 0.000 0.000 0.232 SSW 0.000 0.000 0.093 0.510 0.232 0.000 0.000 0.000 0.000 0.834 SW 0.000 0.000 0.093 0.325 0.000 0.046 0.000 0.000 0.000 0.464 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.046 0.093 0.046 0.000 0.000 0.000 0.185 SUBTOTAL 0.000 0.046 1.159 2.318 0.742 0.185 0.000 0.000 0.000 4.451 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS B 99 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 96 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 4.52 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
58
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.093 0.278 0.185 0.000 0.000 0.000 0.000 0.556 NNE 0.000 0.000 0.371 0.834 0.046 0.046 0.000 0.000 0.000 1.298 NE 0.000 0.000 0.695 0.139 0.000 0.000 0.000 0.000 0.000 0.834 ENE 0.000 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.185 E 0.000 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.139 ESE 0.000 0.000 0.046 0.000 0.046 0.000 0.000 0.000 0.000 0.093 SE 0.000 0.000 0.093 0.139 0.000 0.000 0.000 0.000 0.000 0.232 SSE 0.000 0.000 0.093 0.185 0.000 0.000 0.000 0.000 0.000 0.278 S 0.000 0.046 0.139 0.232 0.093 0.000 0.000 0.000 0.000 0.510 SSW 0.000 0.000 0.417 1.623 0.139 0.000 0.000 0.000 0.000 2.179 SW 0.000 0.000 0.464 0.603 0.046 0.000 0.000 0.000 0.000 1.113 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.093 0.046 0.000 0.000 0.000 0.000 0.139 SUBTOTAL 0.000 0.046 2.643 4.219 0.603 0.046 0.000 0.000 0.000 7.557 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS C 165 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 163 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 3.94 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
59
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.093 2.689 1.159 0.093 0.000 0.000 0.000 0.000 4.033 NNE 0.000 0.046 2.364 1.715 0.139 0.000 0.000 0.000 0.000 4.265 NE 0.000 0.000 0.881 0.232 0.000 0.000 0.000 0.000 0.000 1.113 ENE 0.000 0.093 0.371 0.046 0.000 0.000 0.000 0.000 0.000 0.510 E 0.000 0.093 0.510 0.000 0.000 0.000 0.000 0.000 0.000 0.603 ESE 0.000 0.000 0.417 0.093 0.000 0.000 0.000 0.000 0.000 0.510 SE 0.000 0.000 0.974 0.093 0.000 0.000 0.000 0.000 0.000 1.066 SSE 0.000 0.046 0.742 0.325 0.000 0.000 0.000 0.000 0.000 1.113 S 0.000 0.093 3.106 2.133 0.325 0.046 0.000 0.000 0.000 5.702 SSW 0.000 0.185 4.265 3.338 0.232 0.000 0.000 0.000 0.000 8.020 SW 0.000 0.046 2.179 0.834 0.232 0.000 0.000 0.000 0.000 3.292 WSW 0.000 0.093 1.020 0.325 0.000 0.000 0.000 0.000 0.000 1.437 W 0.000 0.046 0.278 0.185 0.046 0.000 0.000 0.000 0.000 0.556 WNW 0.000 0.046 0.093 0.139 0.046 0.000 0.000 0.000 0.000 0.325 NW 0.000 0.278 0.464 0.417 0.232 0.046 0.000 0.000 0.000 1.437 NNW 0.000 0.185 0.556 0.556 0.325 0.000 0.000 0.000 0.000 1.623 SUBTOTAL 0.000 1.344 20.909 11.590 1.669 0.093 0.000 0.000 0.000 35.605 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS D 770 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 768 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 3.24 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
60
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 1.669 7.000 0.834 0.093 0.000 0.000 0.000 0.000 9.597 NNE 0.000 1.623 2.782 0.325 0.046 0.000 0.000 0.000 0.000 4.775 NE 0.000 0.371 0.325 0.000 0.000 0.000 0.000 0.000 0.000 0.695 ENE 0.000 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.139 E 0.000 0.185 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.325 ESE 0.000 0.278 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.325 SE 0.000 0.325 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.464 SSE 0.000 0.232 0.881 0.000 0.000 0.000 0.000 0.000 0.000 1.113 S 0.000 0.695 0.927 0.046 0.000 0.000 0.000 0.000 0.000 1.669 SSW 0.000 0.603 1.901 0.046 0.000 0.000 0.000 0.000 0.000 2.550 SW 0.000 0.417 2.689 0.510 0.046 0.000 0.000 0.000 0.000 3.662 WSW 0.000 0.278 1.484 0.325 0.000 0.000 0.000 0.000 0.000 2.086 W 0.000 0.695 0.834 0.139 0.000 0.000 0.000 0.000 0.000 1.669 WNW 0.000 0.649 0.556 0.046 0.046 0.000 0.000 0.000 0.000 1.298 NW 0.000 0.649 0.742 0.093 0.093 0.000 0.000 0.000 0.000 1.576 NNW 0.000 1.020 2.179 0.325 0.000 0.000 0.000 0.000 0.000 3.523 SUBTOTAL 0.000 9.828 22.624 2.689 0.325 0.000 0.000 0.000 0.000 35.466 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS E 776 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 765 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 2.06 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
61
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.788 3.848 0.046 0.000 0.000 0.000 0.000 0.000 4.682 NNE 0.000 1.066 1.994 0.000 0.000 0.000 0.000 0.000 0.000 3.060 NE 0.000 0.510 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.603 ENE 0.000 0.139 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.232 E 0.000 0.185 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.278 ESE 0.000 0.278 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.371 SE 0.000 0.232 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.232 SSE 0.000 0.139 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.185 S 0.000 0.185 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.371 SSW 0.000 0.046 0.139 0.000 0.000 0.000 0.000 0.000 0.000 0.185 SW 0.000 0.093 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.185 WSW 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.000 0.093 0.000 0.000 0.000 0.000 0.000 0.000 0.093 WNW 0.000 0.000 0.185 0.000 0.000 0.000 0.000 0.000 0.000 0.185 NW 0.000 0.000 0.232 0.093 0.000 0.000 0.000 0.000 0.000 0.325 NNW 0.000 0.093 0.510 0.185 0.000 0.000 0.000 0.000 0.000 0.788 SUBTOTAL 0.000 3.755 7.742 0.325 0.000 0.000 0.000 0.000 0.000 11.822 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS F 264 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 255 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 1.76 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
62
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JUL 1, 2021 - SEP 30, 2021 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ENE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 E 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 ESE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SE 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SSE 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 S 0.000 0.000 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.046 SSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WSW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 W 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 WNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 NNW 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SUBTOTAL 0.000 0.046 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.093 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 2186 TOTAL HOURS OF STABILITY CLASS G 2 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 2 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 2157 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2021/11/01 MEAN WIND SPEED = 1.55 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
63
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS A (DELTA T<=-1.9 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.023 0.092 0.141 0.139 0.000 0.000 0.000 0.396 NNE 0.000 0.000 0.084 0.528 0.537 0.320 0.005 0.000 0.000 1.473 NE 0.000 0.001 0.136 0.404 0.256 0.092 0.001 0.000 0.000 0.890 ENE 0.000 0.001 0.049 0.087 0.005 0.000 0.000 0.000 0.000 0.143 E 0.000 0.000 0.017 0.023 0.001 0.000 0.000 0.000 0.000 0.041 ESE 0.000 0.000 0.015 0.030 0.002 0.000 0.000 0.000 0.000 0.047 SE 0.000 0.000 0.015 0.032 0.003 0.000 0.000 0.000 0.000 0.051 SSE 0.000 0.000 0.008 0.030 0.025 0.014 0.000 0.000 0.000 0.077 S 0.000 0.000 0.009 0.079 0.109 0.054 0.000 0.000 0.000 0.252 SSW 0.000 0.000 0.023 0.399 0.506 0.155 0.000 0.000 0.000 1.083 SW 0.000 0.000 0.025 0.434 0.269 0.066 0.000 0.000 0.000 0.793 WSW 0.000 0.000 0.005 0.033 0.037 0.016 0.000 0.000 0.000 0.091 W 0.000 0.000 0.003 0.009 0.048 0.049 0.005 0.000 0.000 0.115 WNW 0.000 0.000 0.000 0.013 0.045 0.063 0.000 0.000 0.000 0.121 NW 0.000 0.000 0.001 0.014 0.067 0.100 0.000 0.000 0.000 0.182 NNW 0.000 0.000 0.002 0.017 0.070 0.113 0.001 0.000 0.000 0.204 SUBTOTAL 0.000 0.002 0.416 2.224 2.123 1.181 0.011 0.000 0.000 5.958 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS A 5183 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS A 5181 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 5.95 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
64
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS B (-1.9< DELTA T<=-1.7 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.000 0.013 0.078 0.097 0.092 0.001 0.000 0.000 0.281 NNE 0.000 0.000 0.079 0.298 0.240 0.122 0.005 0.000 0.000 0.744 NE 0.000 0.000 0.131 0.195 0.060 0.026 0.000 0.000 0.000 0.413 ENE 0.000 0.002 0.052 0.029 0.000 0.000 0.000 0.000 0.000 0.083 E 0.000 0.000 0.030 0.013 0.001 0.000 0.000 0.000 0.000 0.044 ESE 0.000 0.000 0.032 0.013 0.000 0.000 0.000 0.000 0.000 0.045 SE 0.000 0.000 0.016 0.036 0.003 0.000 0.000 0.000 0.000 0.055 SSE 0.000 0.000 0.015 0.029 0.010 0.007 0.000 0.000 0.000 0.061 S 0.000 0.000 0.034 0.103 0.077 0.047 0.001 0.000 0.000 0.263 SSW 0.000 0.000 0.051 0.565 0.346 0.132 0.000 0.000 0.000 1.094 SW 0.000 0.000 0.056 0.367 0.162 0.030 0.001 0.000 0.000 0.616 WSW 0.000 0.001 0.015 0.036 0.021 0.014 0.002 0.000 0.000 0.089 W 0.000 0.000 0.000 0.007 0.022 0.031 0.000 0.000 0.000 0.060 WNW 0.000 0.000 0.001 0.021 0.028 0.030 0.003 0.000 0.000 0.083 NW 0.000 0.000 0.002 0.017 0.057 0.038 0.001 0.000 0.000 0.116 NNW 0.000 0.000 0.001 0.021 0.055 0.069 0.001 0.000 0.000 0.147 SUBTOTAL 0.000 0.003 0.529 1.826 1.180 0.638 0.016 0.000 0.000 4.193 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS B 3655 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS B 3646 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 5.49 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
65
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS C (-1.7< DELTA T<=-1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.001 0.034 0.103 0.144 0.082 0.001 0.000 0.000 0.366 NNE 0.000 0.000 0.117 0.348 0.251 0.141 0.009 0.000 0.000 0.867 NE 0.000 0.001 0.225 0.199 0.064 0.024 0.000 0.000 0.000 0.514 ENE 0.000 0.000 0.086 0.024 0.003 0.000 0.000 0.000 0.000 0.114 E 0.000 0.000 0.068 0.014 0.001 0.000 0.000 0.000 0.000 0.083 ESE 0.000 0.000 0.054 0.021 0.000 0.000 0.000 0.000 0.000 0.075 SE 0.000 0.000 0.047 0.045 0.002 0.000 0.000 0.000 0.000 0.094 SSE 0.000 0.001 0.051 0.059 0.014 0.008 0.000 0.000 0.000 0.132 S 0.000 0.000 0.066 0.209 0.103 0.047 0.000 0.000 0.000 0.425 SSW 0.000 0.000 0.168 0.842 0.347 0.098 0.000 0.000 0.000 1.455 SW 0.000 0.001 0.166 0.452 0.193 0.038 0.000 0.000 0.000 0.850 WSW 0.000 0.000 0.037 0.052 0.031 0.017 0.000 0.000 0.000 0.137 W 0.000 0.000 0.007 0.026 0.038 0.028 0.000 0.000 0.000 0.099 WNW 0.000 0.000 0.007 0.018 0.036 0.038 0.003 0.000 0.000 0.102 NW 0.000 0.000 0.001 0.032 0.068 0.053 0.002 0.000 0.000 0.156 NNW 0.000 0.001 0.011 0.048 0.072 0.080 0.001 0.000 0.000 0.215 SUBTOTAL 0.000 0.006 1.145 2.493 1.368 0.654 0.017 0.000 0.000 5.684 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS C 4950 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS C 4943 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 0 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 5.08 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
66
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS D (-1.5< DELTA T<=-0.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.057 1.080 1.192 1.066 0.669 0.007 0.000 0.000 4.072 NNE 0.000 0.054 1.524 2.199 1.610 1.097 0.036 0.001 0.000 6.520 NE 0.000 0.056 0.961 0.430 0.114 0.059 0.002 0.000 0.000 1.623 ENE 0.000 0.028 0.340 0.044 0.002 0.000 0.000 0.000 0.000 0.414 E 0.000 0.017 0.233 0.031 0.001 0.000 0.000 0.000 0.000 0.283 ESE 0.000 0.016 0.216 0.017 0.005 0.001 0.000 0.000 0.000 0.255 SE 0.000 0.034 0.286 0.072 0.010 0.002 0.000 0.000 0.000 0.406 SSE 0.000 0.034 0.522 0.186 0.071 0.074 0.002 0.000 0.000 0.890 S 0.000 0.086 1.486 1.305 0.511 0.365 0.010 0.000 0.000 3.763 SSW 0.000 0.057 2.278 3.002 0.972 0.368 0.002 0.000 0.000 6.680 SW 0.000 0.061 1.452 1.458 0.538 0.175 0.003 0.000 0.000 3.688 WSW 0.000 0.059 0.396 0.273 0.176 0.136 0.005 0.000 0.000 1.043 W 0.000 0.045 0.205 0.246 0.182 0.174 0.008 0.000 0.000 0.859 WNW 0.000 0.033 0.166 0.197 0.214 0.191 0.003 0.000 0.000 0.804 NW 0.000 0.048 0.225 0.375 0.406 0.227 0.002 0.000 0.000 1.283 NNW 0.000 0.057 0.417 0.552 0.634 0.379 0.005 0.000 0.000 2.045 SUBTOTAL 0.001 0.745 11.788 11.580 6.511 3.915 0.086 0.001 0.000 34.627 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS D 30159 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS D 30113 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 1 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 4.59 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
67
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS E (-0.5< DELTA T<= 1.5 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.002 0.522 3.160 1.133 0.255 0.040 0.000 0.000 0.000 5.112 NNE 0.002 0.537 3.391 1.471 0.373 0.049 0.001 0.000 0.000 5.824 NE 0.001 0.324 0.639 0.125 0.014 0.002 0.000 0.000 0.000 1.106 ENE 0.000 0.167 0.137 0.006 0.000 0.000 0.000 0.000 0.000 0.309 E 0.000 0.139 0.106 0.008 0.000 0.000 0.000 0.000 0.000 0.253 ESE 0.000 0.124 0.124 0.008 0.001 0.000 0.000 0.000 0.000 0.258 SE 0.000 0.162 0.227 0.031 0.005 0.001 0.000 0.000 0.000 0.426 SSE 0.000 0.221 0.450 0.135 0.057 0.034 0.000 0.000 0.000 0.897 S 0.001 0.360 1.367 0.584 0.329 0.268 0.006 0.000 0.000 2.915 SSW 0.002 0.343 2.710 1.099 0.528 0.193 0.001 0.000 0.000 4.876 SW 0.002 0.299 2.595 1.015 0.247 0.092 0.000 0.000 0.000 4.251 WSW 0.001 0.206 1.044 0.269 0.078 0.036 0.001 0.000 0.000 1.635 W 0.000 0.204 0.527 0.155 0.048 0.024 0.002 0.000 0.000 0.961 WNW 0.000 0.155 0.407 0.136 0.071 0.016 0.000 0.000 0.000 0.786 NW 0.000 0.212 0.574 0.264 0.089 0.031 0.000 0.000 0.000 1.170 NNW 0.001 0.285 1.219 0.534 0.133 0.033 0.000 0.000 0.000 2.205 SUBTOTAL 0.013 4.259 18.677 6.973 2.229 0.821 0.011 0.000 0.000 32.983 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS E 28777 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS E 28683 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 11 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 3.02 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
68
JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS F ( 1.5< DELTA T<= 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.002 0.267 1.709 0.149 0.002 0.001 0.000 0.000 0.000 2.131 NNE 0.004 0.528 3.319 0.155 0.007 0.000 0.000 0.000 0.000 4.013 NE 0.001 0.419 0.726 0.036 0.002 0.000 0.000 0.000 0.000 1.183 ENE 0.000 0.202 0.098 0.002 0.001 0.000 0.000 0.000 0.000 0.304 E 0.000 0.178 0.075 0.002 0.001 0.000 0.000 0.000 0.000 0.257 ESE 0.000 0.136 0.047 0.001 0.000 0.000 0.000 0.000 0.000 0.184 SE 0.000 0.191 0.070 0.001 0.000 0.000 0.000 0.000 0.000 0.262 SSE 0.000 0.207 0.146 0.006 0.001 0.000 0.000 0.000 0.000 0.360 S 0.001 0.250 0.394 0.028 0.006 0.003 0.000 0.000 0.000 0.681 SSW 0.001 0.170 0.960 0.129 0.011 0.001 0.000 0.000 0.000 1.273 SW 0.001 0.114 0.824 0.137 0.015 0.002 0.000 0.000 0.000 1.093 WSW 0.000 0.036 0.218 0.029 0.000 0.000 0.000 0.000 0.000 0.283 W 0.000 0.037 0.112 0.018 0.003 0.000 0.000 0.000 0.000 0.170 WNW 0.000 0.028 0.077 0.017 0.001 0.000 0.000 0.000 0.000 0.123 NW 0.000 0.040 0.145 0.038 0.001 0.000 0.000 0.000 0.000 0.224 NNW 0.001 0.074 0.377 0.089 0.008 0.000 0.000 0.000 0.000 0.548 SUBTOTAL 0.014 2.875 9.297 0.837 0.061 0.008 0.000 0.000 0.000 13.092 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS F 11420 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS F 11385 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 12 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 2.09 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS
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JOINT PERCENTAGE FREQUENCIES OF WIND SPEED BY WIND DIRECTION FOR STABILITY CLASS G (DELTA T > 4.0 C/100 M)
SEQUOYAH NUCLEAR PLANT JAN 1, 2009 - DEC 31, 2018 WIND WIND SPEED(MPH)
DIRECTION CALM 0.60-1.40 1.41-3.40 3.41-5.40 5.41-7.40 7.41-12.40 12.41-18.40 18.41-24.40 >=24.41 TOTAL N 0.000 0.015 0.070 0.001 0.000 0.000 0.000 0.000 0.000 0.086 NNE 0.001 0.080 0.496 0.021 0.001 0.000 0.000 0.000 0.000 0.599 NE 0.001 0.159 0.397 0.014 0.000 0.000 0.000 0.000 0.000 0.570 ENE 0.000 0.123 0.057 0.000 0.000 0.000 0.000 0.000 0.000 0.181 E 0.000 0.103 0.023 0.000 0.000 0.000 0.000 0.000 0.000 0.127 ESE 0.000 0.100 0.028 0.000 0.000 0.000 0.000 0.000 0.000 0.128 SE 0.000 0.106 0.029 0.000 0.000 0.000 0.000 0.000 0.000 0.135 SSE 0.000 0.170 0.046 0.000 0.000 0.000 0.000 0.000 0.000 0.216 S 0.000 0.163 0.183 0.002 0.000 0.001 0.000 0.000 0.000 0.350 SSW 0.001 0.108 0.440 0.029 0.000 0.000 0.000 0.000 0.000 0.578 SW 0.000 0.031 0.299 0.032 0.000 0.000 0.000 0.000 0.000 0.363 WSW 0.000 0.017 0.025 0.003 0.000 0.000 0.000 0.000 0.000 0.046 W 0.000 0.009 0.008 0.006 0.000 0.000 0.000 0.000 0.000 0.023 WNW 0.000 0.006 0.005 0.001 0.000 0.001 0.000 0.000 0.000 0.013 NW 0.000 0.009 0.003 0.005 0.001 0.000 0.000 0.000 0.000 0.018 NNW 0.000 0.008 0.011 0.011 0.000 0.000 0.000 0.000 0.000 0.031 SUBTOTAL 0.005 1.209 2.120 0.125 0.002 0.002 0.000 0.000 0.000 3.464 TOTAL HOURS OF VALID STABILITY OBSERVATIONS 87160 TOTAL HOURS OF STABILITY CLASS G 3016 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY CLASS G 3012 TOTAL HOURS OF VALID WIND DIRECTION-WIND SPEED-STABILITY OBSERVATIONS 86963 TOTAL HOURS CALM 4 METEOROLOGICAL FACILITY: SEQUOYAH NUCLEAR PLANT STABILITY BASED ON DELTA-T BETWEEN 9.25 AND 45.99 METERS WIND SPEED AND DIRECTION MEASURED AT 9.73 METER LEVEL DATE PRINTED: 2020/07/17 MEAN WIND SPEED = 1.86 NOTE: TOTALS AND SUBTOTALS ARE OBTAINED FROM UNROUNDED NUMBERS