ML18030A389

Informs of Completion of Review of Ref Draft Final SE Re Spent Fuel Pool Cooling for Factual Accuracy

ML18030A389
Person / Time
Site:	Susquehanna
Issue date:	12/13/1994
From:	BYRAM R G PENNSYLVANIA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
PLA-4238, NUDOCS 9412200083
Download: ML18030A389 (4)

Text

12/19/1994B9:5561B-774-7968FPLNUClIC~INGP~B2QjgPennsylvaniaPower&LightCompanyVeoNethNinthStreetsAwentown,PA16101-1179~610/77441618sakrNos-Nuaissr010/7547$02Fav.610/7F44NQDEC~~~SS4U.S.NuclearRegulatoryCommissionAttn.:DocumentControlDeskMaHStationPl-137Washington,D.C.20555SUSQUEHANNASTREAMELEClRECSTATIONSPENTFUELPOOLCOOINGDocketNos.50-3$l/NPP-14and5MIS/NPF-22Eejirences:LetterPomJosephJF.SheatoRG.Byrant,"SusguehmnaStcamElectricStatton,OmitsIand2,DrySgbtyEvaluationRegardingSpentFuelPoolCoolingIssues",datedNovetnber3,1994

DearSir:

PALhascompletedourreviewofthereferenceddraftQnalsafetyevaluationregardingspent%elpoolcoolingforfactualaccuracy.OurcommentswerediscussedinaNovember21,1994teleconbetweenyourMr.JosephSheaandMr.SteveJonesandourMr.JimKennyandothers.Thefollowingarethercmairungcommentsnotedatthcconclusionofthereferencedtclccon.PPkLSEECOMMENTS;1)Page7,Section2.6,lastsentenceofQrstparagraphreads:"Table9.2-3ofreference8liststhedesignmakeuprateforeachESVlooptoeachpoolas60GPM."CCHHMENT'tissuggestedthatthisstatementberevisedto;"Table9.2-3ofreference8liststhedesignmakeuprateforeachfuelpoo1as60GPM."ThcreferencedFSARtablelistsitem11as"MakeuptoFuelPools".EachESWloopcansupply30GPMtoeachpool.Notethatcalculationsindicatethatthrottledflowof35GPMperlinewillbeachieved,EnclosureP.

12/13/1994PFLHUGLIC~Wc.B3FII.ER41-2PLA4238DocumentControlDesk2)Page7,Section2,7,thesentencewhichreads"However,thesafety-relatedloadcenterroomsarelocatedwithinZoneIandZoneII,andthesafety-relatedcontrolstructurechilledwatersystemcoolstheairsuppliedtotheloadcenterroomsfmmthereactorbuildinggeneralarea."COMMENT'heabovestatementiscorrectforUnit1butnotforUnit2.'IbeUnit2safcty-relatedloadcenterroomiscooledbyadirectcxIensioncoolingunit.ThecoolingwaterforthedirectexpansionunitisBS%'.Thiscon6gurationisdescribedinFSARSection9.4.2.2.2.Page17,Section4.2.1,thesentencewhichreads"BecausethccontrolroomindicationisnotfuHyqualifiedandredundant,thestaEconsidersthesealternativemethodsappropriateforbackupindication."COMMENYtWhenthcpoolsarecrosstied,thelevelandtemperatureindicationisredundant,Unit1ispoweredGumdistributionpanel1Y226andUnit2ispoweredfrom2Y226.4)Page26,Section4,3.2,item(2);"PlantproceduresensurenoESWsystemheatloadsaredissipatedthroughasprayloopwithafailedopenspraybypassvalve,exceptECCSandRCICroomcoolers,"COMMENT:Thisisaccurateonlyaftertheest8hoursofanaccident.AsmodeledinEC416-1002,therearenorestrictionswithregardtothealignmentofESWduringtheinitial8hoursoftheevent.Thcanalysisassumesthata<tet8hours,allESWbeatloadsonthcloopwiththefailedopenbypassvalveareshedwiththeexceptionoftheECCSandRCICroomcoolers.ThisactiontoshedloadsisprescribedinSSESemergencyprocedureEP-PS-102toaddresstheunlikelyoccurrencethatthebypassvalvecouldnotbcclosed.5)Page27,Section4.3,3,secondparagraph,lastst~reads"Tlmrewasnoemergency'ightinginareasthatrequirevalvemanipulation."COMMENT:Thoughnoemergencylightsarelocatedintheareasthatrequirevalvemanipulation,essentiallightingisprovidedinthoseareas.Theessentiallightingpowersuppliesarefcd&omClass1E480VACMCC'swhicharedieselgeneratorbacked.'

12/13/199469:55S18--79eePPLM.'CLICEHGP~843PILER41-2PLA4238DocunientControlDesk6)Page32,Section4.4.2.1,assumption8,whichreads"emergencyswitchgearroom5moperatingwithcoolingcoilsreceiving27GPMofcontrolstrucbirechilledwaterat47'F".COblMXNT:TheabovestatementiscorrectforUnit1butnotforUnit2.TheUnit2safety-relatedloadcenterroomiscooledbyadirecteqensioncoolingunit,'QecoolingwaterforthedirectexpansionunitisESWThisconfigurationisdescribedinFSARSection9.4.2,2.2.7)Page32,Section4.4.2.1,itissugsestedthatatenthsignificantassumptionbeaddedwhichidentifiesthat30daysummerwasherwasassumed.Theavcragcoutdoormanmcrairtemperatureiscalculatedfora24hourperiodusingdataandmethodologycontainedin1985ASHRAEFundamentals,TheS'Yosummerdesigndayaveragetemperaturewasusedfortheentire30dayperiodanalyzed.Additionally,thesolargainswerealsocalculatedfortheroofandwallsofthereactorbuilding(includingtherefuelingHoor).Thustheanalysisassumes30straightdaysofsunnyhotweather.8)Page34,Section4.4.22,topparagraph,thesentencewhichreads"PPdtLcalculatedthe'oistureaccumulationintherecircuhtionplenumbyintegratingthccalculatedconcentrationofcondcn!edvaporentrainedinthcQowenteringtherecirculationplenum(1000CFMinleakagcpluspressuredrivenQow)."COMMENT;ThecalculationusedamassQowbalancetodeterminethcHowtotherecirculationplenumQomtherefbelingQoor.Itisrecommendedthatthesentenceberewrittenasfollows;"PPM.calculatedthemoistureaccumulationintherecirculationplenumbyintegratingthecalculatedmassQowofcomieriscdvaporentrainedinthcQowenteringtherecirculationplenum."9)Page34,Section4.4,2.2,secondscntcnccofthesecondparagraph,thesentencewhichreads"TheunanalyzedconditionwasacctnnuhtionofcondensatewithintherecirculationplenumtothecxtcntthatwateroverQowedintotheSGTSductwork,"

12/13/199489:55618-774-7968F~854FILER41-2PLA4238DocumentControlDeskCOMMENT'hisstatementistrueforthetwopoolboilcasebutnotforthesinglepoolboilcasewhichisbeingdiscussedintMssection.Inthetwopoolboilcase,cormknsationintheplenumoccursatatnuchSeterratethanintheSOTSductworksuchthattheplenum61lsfasterthantheductandbeginstooverflowintotheduct.Inthesinglepoolcase,theoppositeistrue,theductcondensationfillstheductbeforetheplenumelisandoverflowsintotheduct.Inadditiontotheabovecomments,PPdhLwiHprovideaseparateresponsetotherequestcontainedonpage3SofthereferenceddocumenttodeflneouruseoftheRHRsystemtopreventspentSmlpoolboilingresultingRomaseismicevent.Shouldyouhaveanyquestionsonthisletter,pleasecontactMr.JamesM,Kennyat(610)774-7904.Verytrulyyours,CC:CRegionIMr.C.Poslusny,Jr.,NRCSr.ProjectManager-OWNMs.M.Banerjee,NRCSr.ResidentInspector-SSES