ML17157C274

Proposed TS 3.4.1.1.2 Re LCO for Recirculation Loops,Single Loop Operation

ML17157C274
Person / Time
Site:	Susquehanna
Issue date:	04/02/1993
From:	PENNSYLVANIA POWER & LIGHT CO.
To:
Shared Package
ML17157C275	List: ML17157C274 ML18030A382
References
NUDOCS 9304090264
Download: ML17157C274 (8)

Text

TECHNICALSPECIFICATIONMARKUPS9304090264930402pfPDRADOCK05000387PDR RIRLATINLP.-INLELPPERATNLIMITINNDITIONFROPERATION3.4.1~1.2Onereactorcoolantrecirculationloopshallbeinoperationwiththepumpspeeds80%oftheratedpumpspeedandthereactorataTHERMALPOWER/coreflowconditionoutsideofRegionsIandIIofFigure3.4.1.1.1-1,anda.thefollowingrevisedspecificationlimitsshallbefollowed:1.Specification2.1.2:theMCPRSafetyLimitshallbeincreasedto1.07.4.0V~E2.Table2.2.1-1:theAPRMFlow-BiasedScramTripSetpointsshallbeasfollows:=~,;-Trip',Setpoint.~;~"."";-.>-."'P~~~Pr-".'gj".;~~~'4b:.':'"lAIIowabhi:Value~-,":,~'",'.s0.58W+54%s0.58W+57%v00H~vCTj\3.Specification3.2.2:theAPRMSetpointsshallbeasfollows:""""j~'":"'":""')Trip,'Setpoht~"-""'~"""'i"."'F~':'~4Z~~'-:"AIIowable'Yah'-';;<i+:.--'"i>>Ss(0.58W+54%)TSps(0.58W+45%)TSs(0.58W+57%)TS<s(0.58W+48%)T4.Specification3.2.3:TheMINIMUMCRITICALPOWERRATIO(MCPR)shallbegreaterthanorequaltothelargestofthefollowingvalues:Ia.theMCPRdeterminedfromFigure3.2.3-1plus0.01,andIb.theMCPRdeterminedfromFigure3.2.3-2,Figure3.2.3-3,orFigure3.2.3-4,asappropriate,plus0.01.~~~~~g.'gTable3.3.6-2:theRBM/APRMControlRodBlockSetpointsshallbeasfollows:a.RBM-Upscaleb.APRM-FlowBiasedTripSetpoint:.-,',s0.66W+36%TripSetpoint'..=".~-'0.58W+45%~v.",;.'AllowableValoe:.'".'-':.'0.66W+39%;.'-.';-'+;:AIIowibieVetue~,",',,"'s0.58W+48%*:<<<<+.doperation.¹SUSQUEHANNA-UNIT13/44-1cAmendmentNo.118

RESPONSETONRCQUESTIONS RESPONSETONRCQUESTIONSREACTORSYSTH6BRANCHREV.1QUESTION3Ifsingleloopoperation(SLO)yieldsahigherpeakcladdingtemperature(PCT)thantwoloopoperation,whyistheupperboundpeakcladdingtemperature(UBPCT)basedontwoloopoperationapplicableforSLO?DoesthelimitingsinglefailureandbreaksizeremainthesameforSLOasfortwoloopoperation?DiscusstheapplicabilityofSAFER/GESTRforSLOinviewofthefactSLOresultsinahigherPCT.Operationwithonerecirculationloopoutofserviceisallowed,butitisnotconsideredanormalmodeofoperation.SLOisaspecialoperationalconditionwhenonlyoneofthetworecirculationloopsisoperable.Inthisoperatingcondition,thereactorpowerwillbelimitedtolessthan804ofratedbythemaximumachievablecoreflow,whichistypicallylessthan604ofratedcoreflow.ApostulatedLOCAoccurringintheactiverecirculationloopduringSLOwouldcauseamorerapidcoastdown,oftherecirculationflowthanwouldoccurintwoloopoperation,whereoneactiveloopwouldremainintact.Thisrapidcoastdowncausesanearlierboilingtransitiontimeanddeeperpenetrationofboilingtransitionintothebundle,whichtendstoincreasethecalculatedPCT.However,thePCTeffectsoftheearlyboilingtransitionaresubstantiallyoffsetbythemitigatingeffectofthelowerpowerlevelachievableatthestartofsuchanevent.TheSAFER/GESTR-LOCAanalysisresultsforSusquehanna(NEDC-32071P)forSLOandtwoloopoperationarewellbelow2200'F.TheECCSperformanceforSusquehannaunderSLOwasevaluatedusingSAFER/GESTR-LOCA.CalculationsfortheDBAwereperformedusingbothnominalandAppendixKinputs.TheSLOSAFER/GESTR-LOCAanalysisfortheDBAassumesthatthereisessentiallynoperiodofrecirculationpumpcoastdown.Thus,dryoutisassumedtooccursimultaneouslyatallaxiallocationsofthehotbundleshortlyafterinitiationoftheevent.DryoutisassumedtooccurinonesecondforthenominalcaseandO.lsecondfortheAppendixKcase.TheseassumptionsareveryconservativeandprovideboundingresultsfortheDBAunderSLO.Thetwo-loopAppendixKbreakspectrumdocumentedinNEDC-32071PisrepresentativeofSLObecausethetwo-loopspectrumwasanalyzedassumingaoneseconddryouttimeforallaxiallocationsofthehotbundle.Asshownbythetwo-loopbreakspectrum,theDBAisthelimitingcaseforSLO.Inaddition,SLOwillaffecttheDBAresultsmorethanthesmallerbreaks.WithbreakssmallerthantheDBA,thereisalongerperiodofnucleateand/orfilmboilingpriortofueluncoverytoremovethefuelstoredenergy.AnLHGRreduction(multiplier)of0.70willbeimposedwhentheplantisinSLO.AsshowninTable5-6ofNEDC-32701P,theSLOresultsarelesslimiting(i.e.,lowerPCTs)thantheresultsforthetwoloopDBALOCA.Thus,thelicensingPCTisbasedappropriatelyontwoloopoperationratherthanSLO.

~'

OErrataandAddendaSheetApplicableto:PublicationNo.TitleUnits1and2SAFERGESTR-LOCALoss-Of-ColantAccidentAnalsisIssueDateGf'NvdeerfnerJry/15CurlerA@eveSanJm.CA85125EBANo.Datec199Note:Correctallcopiesoftheapplicablepublicationasspecifiedbelow.References(SecdaaPapePareyaptCkeJlmtrecdaer(Conec0iesaifAdkera)Pages5-6and5-7Replacewithnewpages5-6and5-7Page5-l3ReplacewithnewPage5-13(changebracketsinrighthandmarginindicateareaswherereporthasbeenchanged)

/>