ML17208A480

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Proposed Tech Spec Changes,Increasing Combined Secondary Containment Bypass Leakage Rates & Intake of Outside Air Into Control Room
ML17208A480
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 04/18/1980
From:
FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17208A479 List:
References
NUDOCS 8004230464
Download: ML17208A480 (10)


Text

CONTAINMENT SYSTEHSCONTAINMENT LEAKAGELIMITINGCONDITION FOROPERATION 3.6.1.2Containment leakageratesshallbelimitedto:a.Anoverallintegrated leakagerateof:=l.<La,0.50percentbyweightofthecontainment airper24hoursatP,(39.6psig),or2.<Lt,0.32percentbyweightofthecontainment airper24hoursatareducedpressureofPt,(19.8psig).b.Acombinedleakagerateof<0.60Laforallpenetrations andvalvessubjecttoTypeBandCtestsasidentified inTable3.6-1whenpressurized toPa.c.Acombinedleakagerateof<0.27Laforallpenetrations identified inTable3.6-1assecondary containment bypassleakagepathswhenpressurized toPa.APPLICABILITY:

NODES1,2,3and4.ACTION:Witheither(a)themeasuredoverallintegrated containment leakagerateexceeding 0.75Laor0.75Lt,asapplicable, or(b)withthemeasuredcombinedleakagerateforaTlpenetrations andvalvessubjecttoTypesBandCtestsexceeding 0.60La~or(c)withthecombinedbypassleakagerateexceeding 0.27La,restoretheleakagerate(s)towithinthelimit(s)priortoincreasingtheReactorCoolantSystemtemperature above200'F.SURVEILLANCE REUIREMENTS 4.6.1.2Thecontainment leakageratesshallbedemonstrated atthefollowing testscheduleandshallbedetermined inconformance withthecriteriaspecified inAppendixJof10CFR50usingthemethodsandprovisions ofANSIN45.4-1972:

a.ThreeTypeAtests(Overallintegrated Containment LeakageRate)shallbeconducted at40+10monthintervals duringshutdownateitherPa(39.6psig)oratPt(19.8psig)duringeach10-yearST.LUCIE-UNIT13/46-24/18/80 CONTAINMENT SYSTBiSSUR'lEILLANCE REQUIRB1ENTSContinued) serviceperiod.Thethirdtestofeachsetshallbeconducted duringtheshutdownforthe10-yearplant.inservice inspection..

b.IfanyperiodicTypeAtestfailstomeeteither.75Lor.75L,thetestscheduleforsubsequent TypeAtestsshallbreviewedandapprovedbytheCommission.

Iftwoconsecutive TypeAtestsfailtomeeteither.75Lor.75L,a=-TypeAtestshallbeperformdatleastevery18mont~isuntiltwocon-secutiveTypeAtestsmeteither.75Lor.75Latwhichtimetheabovetestschedulemayberesumed.c.TheaccuracyofeachTypeAtestshallbeverifiedbyasupplemental testwhich:l.ConfirmstheaccuracyoftheTypeAtestbyverifying thatthedifference betweensupplemental andTypeAtestdataiswithin0.25Lor0.25Lt,a2..Hasadurationsufficient toestablish accurately thechangeinleakagebetweentheTypeAtestandthesupplemental testd.e.3.Requiresthequantityofgasinjectedintothcontainment orbledfromthecontainment duringthesupplementa'1 testtobeequivalent toatleast25percent,ofthetotalmeasuredleakagerateatP-(39.6psig)orPt(19.8psig).aTypeBand'Ctestsshallbeconducted withgasatP'39;6psig)atintervals nogreaterthan24monthsexceptfortestsin-volvingairlocks..Thecombinedbypassleakagerateshallbedetermined tobe<0.27Lbyapplicable TypeBandCtestsatleastonceper24monthsexceptforpenetrations whichare.notindividually testable; penetrations notindividually testableshallbedetermined tohavenodetectable leakagewhentestedwithsoapbubbleswhilethecontainment ispressurized toP(39.6psig)duringeachTypeAtest.Airlocksshallbetestedanddemonstrated OPERABLEperSurveillance Requirement 4.6.1.3.ST.LUCIE-UNIT13/46-34/18/80 0V PLANTSYSTEHSSURVEILLANCE REUIREHENTS Continued) e.At.leastonceper18monthsby:l.'erifying thatthepressuredropacrossthecombinedHEPAfiltersandcharcoaladsorberbanksis<4.15inchesHaterGaugewhileoperating theventilation systema.taflowrate.of2000cfm+10/..A2.'erifying thatonacontainment i'solation signalorchlorineaccidentdetection signal,thesystemautomatically isolatesthecontrolroomwithin35secondsandswi"tches intoarecirculation mode.ofoperation withflowthroughtheHEPAfiltersandcharcoaladsorberbanks.3.'eri,ying thatthesystemmaintains thecontrolroomatapositivepressureof>1/8inchH.G.relativetotheoutsideatmosphere duringsystemoperation with<450'cfmoutsideairintake.f.""Aftereachcompleteorpartialreplacement of.aHEPAfilterbankbyverifying thattheHEPAfilterbanksremove>99iloftheDQPwhentheyaretestedin-p'lace inaccordance withANSI.N510-1975 whileoperating theventilation systemataflowrateof2000cfm+10!..,-.'...~Afg.Aftereachcompleteorpartialreplacement ofacharcoa1adsorberbankbyverifying thatthcharcoaladsorbers remove>99;ofahalogenated hydrocarbon refrigranttestgaswhentheyaretestedin-placeinaccordance withANSIN510-1975 whileoperating theventilation systemataflowrateof2000'fm+10/.ST.LUCIE-UNIT13/47-234/18/80 SAFETYEVALUATIOH 0Re."St.LucieUnit.l;,'ocket No50-335ProposedAmendment Containment

&ControlRoomLeakageI.Introduction Thisevaluation supportsaproposalto(1)increasethecombinedleakagerateallowedforallpenetrations identified assecondary containment by-passleakaqepaths,and(2)increasethelimitonoutsideairintakeintothecontrolroomduringtherecirculation modeofoperation.

Thesoughtafterbypassleakagerateof27'Awaspreviously evaluated inAppendix6BoftheFSAR.Thereevaluation discussed hereinisbasedonamoreconser-vativecontainment modelingtechnique.

Thecurrentlimitoncontrolroomoutsideairintakeisbasedontheoriginalcontrolroompost-LOCA habit-abilityevaluation thatispresented inFSARsection15.4.1.2.5(d).

Theevaluation didnottakecreditfortheoperation ofthe"backfitted" IodineRemovalSystem(IRS)andShieldBuildingVentilation System(SBVS)heaters.Thereevaluation discussed belowusesthesamecontrolroommodelsandassumptions presented intheFSARinadditiontotheoperation ofthe"backfitted" systems.II.Discussion TheSt.LucieUnit1calculations estimating wholebodyandthyroiddosesfromapostulated lossofcoolantaccident(LOCA)havebeenrevised.Therevisedanalysisusesamoreconservative containment releasemodel.Theanalysiswaspreviously presented inAppendix6BoftheFSAP,andwasbasedonasinglevolumewell-mixed containment activityreleasemodelaswellasthe"backfit",

containment bypassfractionof27K.Thedifference betweentheFSARanalysisandtheanalysisdescribed hereinisthatamoreconser-vativetwocompartment containment modelisusedthattakesintoaccountthedifference iniodinescrubbing effectiveness betweentheregionsofthecon-tainmentthatreceiveordonotreceivespraycoverage.

Thevolumeofthecontainment atmosphere thatissprayedisconservatively assumedtobe86/.i'lixingisassumedtooccurbetweenthesprayedandunsprayed regionsatarateof4volumesofunsprayed regionperhour.Theonlyotherchangeinassumptions fromthosepresented inAppendix6BoftheFSARisthatittakes44minutesforthespraystoreducetheelemental iodineconcentration inthecontainment bytheallowable factorof100ratherthanthepreviousperiodof28minutes.Theremovalofparticulate iodinebythespraysisterminated at1hour.ThepHofthesodiumhydroxide solutionatthespraynozzlewillbebetween8.5andll.TherevisedoffsiteLOCAdosesarepre-sentedinTablel.Althoughtherevisedthyroiddosesforboththeexclu-sionzoneboundaryandlowpopulation zonearesomewhathigherbecauseamoreconservative modelwasused,theyarestillwellwithinthe300remlimitsetby10CFR100forthereactorsitingcriteria.Intheprocessofdeveloping revisedoffsiteLOCAdosecalculations, itwasdetermined thatTechnical Specification leaktestingcriteriacouldbemadelessstringent.

ThecurrentSpecifications seta12"limitonunfiltered

,0SAFETYEVALUATION (Continued) 0secondary containment bypassleakageanda100CFHlimitonControlRoomin-leakage.TherevisedLOCAanalysisdiscussed abovejustifies acontainment bypassleakageofupto27%andacontrolroominleakage ofupto450CFH.TheLOCAdosespresented inTable1arebasedonabypassleakageof27'Aandthemoreconservative containment model.AllotherFSARassumptions havebeenretained, Therevised30daypost-LOCA controlroomdosesarepresented inTable2andarecomparedtothosepresented intheFSAR.Thecontrolroomdosemodelusedinthereelevation isidentical tothemodeldescribed inchap-.ter15oftheFSAR.Theonlychangeinassumptions isthattheIRSandSBVSheat"backfits" havebeenincorporated andthecontainment bypassleakagein-creasedto27~value.Controlroominleakage isconservatively limitedto450CFH.Thismaximumvalueofinleakage,plustheControlRoomairconditioning System,assuresthattherelativehumidityoftheairattheinletofthecon-trolroom'scharcoalfiltersislessthan70/,Relativehumiditymustbemain-tainedbelowthisvalueinorderthattheassumedcharcoalefficiencies presen-tedonFSARpage15.4.1-20d canbeobtained..

Theeffectofapostulated chlo-rinereleaseonthecontrolroomhabitability wasalsoreevaluated.

Thechlorinereleaseevaluation illustrated avalueforinleakage of568CFtlwhichisabovethelimitation imposedbytherelativehumidityrequirements.

III.Conclusion Mehaveconcluded, basedontheconsiderations discussed above,that:(1)theamendment doesnotinvolveasignificant increaseintheprobability orcon-sequences ofaccidents previously considered anddoesnotinvolveasignificant decreaseinasafetymargin,(2)thereisreasonable assurance thatthehealthandsafetyofthepublicwillnotbeendangered byoperation intheproposedmanner,and(3)suchactivities willbeconducted incompliance withtheCom-mission's regulations andtheissuanceofthisamendment willnotbeinimicaltothecommondefenseandsecurityortothehealthandsafetyofthepublic, TABLEIREEYALUATION OFFSAROFFSITELOCADOSESFOR27'ASHIELDBUILDINGBYPASSLEAKAGE2HourThyroid-Doseat1555Meters(EZB)2HourMholeBodyDoseat1555fleters(EZB)30DayThyroidDoseat1609tIeters(LPZ)30Dayi<holeBodyDoseat1609Meters(LPZ)~FSAR66rem4rem150rem5.5rem*~ANENDt1ENT75rem4rem167rem6rem*PostiodineremovalsystemsbackfitcaseperFSARAppendix6Batpage68-17.**PostIodineremovalsystemsbackfitcaseperFSARAppendix6Bwithaddition-alcalculational conservatisms asnotedintext.

TABLEIIREEVALUATION OFFSARCONTROLROOMLOCADOSESFORTHEPOSTIODINEREMOVAL'YSTEMS BACKFI'TCASELIITH450CFMINLEAKAGE ControlRoomThyroidDoseControlRoom(!holeBodyDoseControlRoomSkinDose"FSAR'0rem1.7rem17.8rem**At1EIIDMENT 12.5rem3.0rem27.0rem*FSARcaseatpage15.4.1-20d withnocreditforiodineremovalsystembackfitsand100CFMcontrolroominleakage.

~*Postiodineremovalsystemsbackfitcasewithadditional calculational conservatisms asnotedintextand450CFMcontrolroominleakage.

STATEOFFLORIDA))COUNTYOFDADE)ssRobertE.Uhrig,beingfirstdulysworn,deposesandsays:ThatheisaVicePresident ofFlorid'aPower5LightCompany,theLicenseeherein;Thathehasexecutedtheforegoing document; thatthestate-mentsmadeinthissaiddocumentaretrueandcorrecttothebestofhisknowledge, information, andbelief,andthatheisauthorized toexecutethedocument-onbehalfofsaidLicensee.

RobertE.Uhrig~SCIBQOrASubscribed andsworntobeforemethistil~NOTARYPUBLX,inandforthecountyofDade,StateofFloridaNotaryPubgc,StateotFloridaatLargoMyCommis"'on ExpiresOctober30,>>1983loryCOmmiSSiOn eXpireS:~endedtbruMaynardEondingAgency kg"w.PIIQY(