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

12/19/1994 B9:5561B-774-7968 FPLNUClIC~INGP~B2QjgPennsylvania Power&LightCompanyVeoNethNinthStreetsAwentown, PA16101-1179

~610/7744161 8sakrNos-Nuaissr010/7547$02Fav.610/7F44NQ DEC~~~SS4U.S.NuclearRegulatory Commission Attn.:DocumentControlDeskMaHStationPl-137Washington, D.C.20555SUSQUEHANNA STREAMELEClRECSTATIONSPENTFUELPOOLCOOINGDocketNos.50-3$l/NPP-14and5MIS/NPF-22 Eejirences:

LetterPomJosephJF.SheatoRG.Byrant,"Susguehmna StcamElectricStatton,OmitsIand2,DrySgbtyEvaluation Regarding SpentFuelPoolCoolingIssues",datedNovetnber 3,1994

DearSir:

PALhascompleted ourreviewofthereferenced draftQnalsafetyevaluation regarding spent%elpoolcoolingforfactualaccuracy.

Ourcommentswerediscussed inaNovember21,1994teleconbetweenyourMr.JosephSheaandMr.SteveJonesandourMr.JimKennyandothers.Thefollowing arethercmairung commentsnotedatthcconclusion ofthereferenced tclccon.PPkLSEECOMMENTS; 1)Page7,Section2.6,lastsentenceofQrstparagraph reads:"Table9.2-3ofreference 8liststhedesignmakeuprateforeachESVlooptoeachpoolas60GPM."CCHHMENT't issuggested thatthisstatement berevisedto;"Table9.2-3ofreference 8liststhedesignmakeuprateforeachfuelpoo1as60GPM."Thcreferenced FSARtablelistsitem11as"MakeuptoFuelPools".EachESWloopcansupply30GPMtoeachpool.Notethatcalculations indicatethatthrottled flowof35GPMperlinewillbeachieved, Enclosure P.

12/13/1994 PFLHUGLIC~Wc.B3FII.ER41-2PLA4238DocumentControlDesk2)Page7,Section2,7,thesentencewhichreads"However, thesafety-related loadcenterroomsarelocatedwithinZoneIandZoneII,andthesafety-related controlstructure chilledwatersystemcoolstheairsuppliedtotheloadcenterroomsfmmthereactorbuildinggeneralarea."COMMENT'he abovestatement iscorrectforUnit1butnotforUnit2.'IbeUnit2safcty-related loadcenterroomiscooledbyadirectcxIension coolingunit.Thecoolingwaterforthedirectexpansion unitisBS%'.Thiscon6guration isdescribed inFSARSection9.4.2.2.2.

Page17,Section4.2.1,thesentencewhichreads"Becausethccontrolroomindication isnotfuHyqualified andredundant, thestaEconsiders thesealternative methodsappropriate forbackupindication."

COMMENYtWhenthcpoolsarecrosstied, thelevelandtemperature indication isredundant, Unit1ispoweredGumdistribution panel1Y226andUnit2ispoweredfrom2Y226.4)Page26,Section4,3.2,item(2);"Plantprocedures ensurenoESWsystemheatloadsaredissipated throughasprayloopwithafailedopenspraybypassvalve,exceptECCSandRCICroomcoolers,"

COMMENT:Thisisaccurateonlyaftertheest8hoursofanaccident.

AsmodeledinEC416-1002, therearenorestrictions withregardtothealignment ofESWduringtheinitial8hoursoftheevent.Thcanalysisassumesthata<tet8hours,allESWbeatloadsonthcloopwiththefailedopenbypassvalveareshedwiththeexception oftheECCSandRCICroomcoolers.Thisactiontoshedloadsisprescribed inSSESemergency procedure EP-PS-102 toaddresstheunlikelyoccurrence thatthebypassvalvecouldnotbcclosed.5)Page27,Section4.3,3,secondparagraph, lastst~reads"Tlmrewasnoemergency

'ightinginareasthatrequirevalvemanipulation."

COMMENT:Thoughnoemergency lightsarelocatedintheareasthatrequirevalvemanipulation, essential lightingisprovidedinthoseareas.Theessential lightingpowersuppliesarefcd&omClass1E480VACMCC'swhicharedieselgenerator backed.'

12/13/1994 69:55S18--79eePPLM.'CLICEHGP~843PILER41-2PLA4238Docunient ControlDesk6)Page32,Section4.4.2.1,assumption 8,whichreads"emergency switchgear room5moperating withcoolingcoilsreceiving 27GPMofcontrolstrucbire chilledwaterat47'F".COblMXNT:

Theabovestatement iscorrectforUnit1butnotforUnit2.TheUnit2safety-related loadcenterroomiscooledbyadirecteqensioncoolingunit,'Qecoolingwaterforthedirectexpansion unitisESWThisconfiguration isdescribed inFSARSection9.4.2,2.2.

7)Page32,Section4.4.2.1,itissugsested thatatenthsignificant assumption beaddedwhichidentifies that30daysummerwasherwasassumed.Theavcragcoutdoormanmcrairtemperature iscalculated fora24hourperiodusingdataandmethodology contained in1985ASHRAEFundamentals, TheS'Yosummerdesigndayaveragetemperature wasusedfortheentire30dayperiodanalyzed.

Additionally, thesolargainswerealsocalculated fortheroofandwallsofthereactorbuilding(including therefueling Hoor).Thustheanalysisassumes30straightdaysofsunnyhotweather.8)Page34,Section4.4.22,topparagraph, thesentencewhichreads"PPdtLcalculated the'oistureaccumulation intherecircuhtion plenumbyintegrating thccalculated concentration ofcondcn!ed vaporentrained inthcQowenteringtherecirculation plenum(1000CFMinleakagc pluspressuredrivenQow)."COMMENT;Thecalculation usedamassQowbalancetodetermine thcHowtotherecirculation plenumQomtherefbeling Qoor.Itisrecommended thatthesentenceberewritten asfollows;"PPM.calculated themoistureaccumulation intherecirculation plenumbyintegrating thecalculated massQowofcomieriscd vaporentrained inthcQowenteringtherecirculation plenum."9)Page34,Section4.4,2.2,secondscntcnccofthesecondparagraph, thesentencewhichreads"Theunanalyzed condition wasacctnnuhtion ofcondensate withintherecirculation plenumtothecxtcntthatwateroverQowed intotheSGTSductwork,"

12/13/1994 89:55618-774-7968 F~854FILER41-2PLA4238DocumentControlDeskCOMMENT'his statement istrueforthetwopoolboilcasebutnotforthesinglepoolboilcasewhichisbeingdiscussed intMssection.Inthetwopoolboilcase,cormknsation intheplenumoccursatatnuchSeterratethanintheSOTSductworksuchthattheplenum61lsfasterthantheductandbeginstooverflowintotheduct.Inthesinglepoolcase,theoppositeistrue,theductcondensation fillstheductbeforetheplenumelisandoverflows intotheduct.Inadditiontotheabovecomments, PPdhLwiHprovideaseparateresponsetotherequestcontained onpage3Softhereferenced documenttodeflneouruseoftheRHRsystemtopreventspentSmlpoolboilingresulting Romaseismicevent.Shouldyouhaveanyquestions onthisletter,pleasecontactMr.JamesM,Kennyat(610)774-7904.

Verytrulyyours,CC:CRegionIMr.C.Poslusny, Jr.,NRCSr.ProjectManager-OWNMs.M.Banerjee, NRCSr.ResidentInspector

-SSES