ML17258B185

Forwards Responses to Questions 1,2,3,5 & 6 of SEP Topic VI-7.B Re ESF Switchover,Per NRC 810227 Ltr

ML17258B185
Person / Time
Site:	Ginna
Issue date:	08/18/1981
From:	MAIER J E ROCHESTER GAS & ELECTRIC CORP.
To:	CRUTCHFIELD D Office of Nuclear Reactor Regulation
References
TASK-06-07.B, TASK-6-7.B, TASK-RR NUDOCS 8108250280
Download: ML17258B185 (15)

Text

REBULATOR'NPORMATIONDISTRIBUTIONSTEM(RIBS)~IACCESSIONNBR:8108250280.DOC~DATE'.-81/08/18NOTARIZED:NOFACIL>>:50.244RobertEmmetGinnaNuclearPlant<UnitliRochestelGAUTHIBNAMEAUTHORAFFILIATIONMAIER'rJ~E'RochesterGasLElectricCorpsRECIP~NAMKIRECIPIENTAFFIL>>IATIONCRUTCHFIELD<,D,OperatingReactorsBranch5

SUBJECT:

ForwardsresponsestoQuestions1p2g3g5L6ofSEPT'opicVI~7~B;reESFswitchover'gper8102271tr.DISTRIBUTIONCDDEi:A03SSCOPIESRECEIVED:LiTRgENCLL'IZE""'T>>ITLK~:SEPT'opicsNOTES!'1copy:SEPSectsLdrDOCKEiT¹0500024405000244RECIPIENT'D'ODE/NAMEIACTiION:ORB.¹5BC04VINTERNAL>>$A/9'ATLLQUAl>>13(HYD/GKO."BR10,ORASSESSBR11SEPBR12!COPIESLTTRENCL<77I3RECIPIENT.IDCOOK/NAME.CONT"SYSA07I8E'6"01.COPIES'>>TTR>>ENCL11>>2211EXTERNAL>>sACRSNRCPORENTIS1402!ie111LPDRNSIC03>>05>>1111~'tTOTALNUMBER"OFCOPIESRKQUIRED:'"L>>TTRENCL~

IQ'IIQ1II1aQ1+pg"QlIII11Ii1t',r$lI4 zimzzziuznzzAIV0>>zuigruuesuzn~lZZilZIZrZZit.ROCHESTERGASANDELECTRICCORPORATION)'SOAK)H'go89EASTAVENUE,ROCHESTER,N.Y.14649JOHNE.MAIERVICEPRESIDENTTCLKPHONL'REACODE7IO546.2700August18,1981ci'veDirectorofNuclearReactorRegulationMr.DennisM.Crutchfield,ChiefOperatingReactorsBranchNo.5DivisionofLicensing'.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

SEPTopicVI-7.B,"ESFSwitchover"R.E.GinnaNuclearPowerPlantDocketNo.50-2443

DearMr.Crutchfield:

AttachedisaresponsetoyourletterofFebruary27,1981regardingthisSEPtopic.BasedonsubsequentcorrespondencebetweenDennisM.CrutchfieldandJamesA.KayofYankeeAtomicElectricCompany,datedJune4,1981,ithasbeendeterminedthatthemajorNRCstafffocusforthisreviewconcernstheinstru-mentationandcontrolsusedtoindicateRefuelingWaterStorageTanklevelandtoterminatetheinjectionphaseofEmergencyCoreCooling.Thebasesforthisre-focusareprovidedinSectionVofthisreferencedletter.RochesterGasandElectricwillthusrespondonlytoquestions1,2,3,5,and6oftheFebruary27,1981letter.Theinformationrequestedinquestion4canonlybeobtainedviaadetailedhydraulicsetofcalculations,whicharenotavailableatthistime.Ifrequiredtocompletethistopicassessment,ascheduleforthisanalysiscanbeprovided.Itappears,however,thattheparticularconcernsofthisSEPtopicassessmentareaddressedinourresponsessubmittedintheattachment.Verytrulyyours,Attachmenti/i8108250280810818tPDRADOCK05000244>>P,PMr'

~~IIl4wVke'l

Attachment:

AdditionalInformationRequestedByFebruary27,1981LetterRegardingSEPTopicVI7.B,"ESFSwitchover"(1)Describetheproceduresusedtoswitchoverfromtheinjectiontotherecirculationmodeofemergencycorecooling(ECC).Response1:GinnaEmergencyProcedureE-1.2,"LossofReactorCoolant",describestheprocedureusedtoswitchoverfromtheinjectiontotherecirculationmodeofemergencycorecooling.Acondenseddescriptionispresentedhere.1)Atthe31%lowRWSTlevelalarmLIA-921,stoponesafetyinjection(SI)andonecontainmentspray(CS)pump,ifmorethanonearerunning.2)At10%onLT-920intheRWST,stoptheoperatingsafetyinjection,containmentspray,andresidualheatremovalpumps.3)Closethefollowingvalves:896A,RWSTtoSIPumps896B,RWSTtoSIPumps897,SIPumpRecirculationtoRWST898,SIPumpRecirculationtoRWST704A,RHRPump1ASuctionCross-Tie704B,RHRPump1BSuctionCross-Tie4)Openthefollowingvalves:850A,RHRPump1ASuctionfromSumpB850B,RHRPump1BSuctionfromSumpB5)Start1Aand1BRHRPumps6)CheckRHRflowonFI-626Thissetofactionswillinitiatelowheadrecirculation.Ifhighheadrecirculation,orlowheadrecirculationwithsprayisrequired,thefollowingadditionalactionsmustbeperformed:~HihHeadRecirculation1)CheckRCwiderangepressurePR-4202)OpenvalvesMOV-857A,B,C-RHRtoSIandCSpumpsuction3)StartSafetyInjectionpumps1Aand1B4)CheckSIflowinFI-924andFI-925 IIhl)I LowHeadRecirculationwi~thSra1)Checksprayadditive(NaOH)tanklevelLT-931andLIA-9322)CheckcontainmentpressurePT-944-9503)OpenvalvesMOV857A,B,C-RHRtoSIandCSpumpsuctions4)StartContainmentSprayPump(s)1Aand/or1B5)CheckNaOHflowFI-9306)CheckRHRandCSflowsFI-931A,931B,626(2)Foreachinstrument,indicator,logicdeviceandalarmthatisusedbytheoperatortoperformamanualfunctionorthatisusedtoinitiateanautomaticfunctionintheswitchoversequence;describehowthatdeviceisqualifiedandin-stalled(e.g.independenceandseparationofcircuits)asClass1Eequipment.Response2:Allindicationsrequiredbytheoperatortoper-formasafety-relatedfunctionhaveredundant.ordiversecomponents.Theinstrumentbuselectricalone-linediagram,RG&Edrawing521489-269showingpowersupplyarrangements,isattached.1)RWSTlevel,LT-920,oninstrumentbus1C(IB1C),isbackedupbylevelindicatingalarmLIA-921ontheannunciatorpowertransformer(normallyfedfrombattery1A).2)3)RHRflowFI-626,onIB1CisbackedupbyRCwiderangepressurePR-420onIB1D.Instrumentbus1D,althoughfedfromnon-safeguardsbus15,isprocedurallyconnectedtosafeguardsbus16ifoffsitepowerislostpriortothetimethatRWST-to-sumpswitchoverwouldberequired.SIflowFI-924,onIB1AandFI-925,onIB1B,areredundant4)NaOHtanklevelLT-931,onIB1CisbackedupbyLIA-932onIB1B.5)Thereareseven'containmentpressureindicationsPT-944toPT-950onredundantpowersources.6)NaOHflowFT-930onIB1CisbackedupbytanklevelLIA-932onIB1B.7)RHRflowtosuctionofCSandSIpumpsFI-931AonIB1CandFI-931BonIB1Bareredundant.

0 Alloftheinstrumentationwhichmightexperienceanadversepost-accident.environm'enthasbeenincludedintheRGGEenvironmentalqualificationprogram,asstatedinletterdatedOctober31,1980fromJohnE.MaiertoDarrellG.Eisenhut.(3)Describethelevelsensingsystemthatis'sedtoindicateordetectthelevelinthetankthatsuppliesinjectioncoolant.Thisdescriptionshouldincludesensoranddatacolumnlocation,freezeprotection,freezeprotectionpowersupplyandthoseitemsspecifiedin(2)above.Response3:LeveltransmitterLT-920andlevelindicatingalarmLIA-921,whosesensorsarelocatedatthebaseoftheRWST,providetheoperatorwithredundantindicationofRWSTlevel.SinceatGinnatheRWSTislocatedintheauxiliarybuilding,whichismaintainedabovefreezingtemperatures,,nofreezeprotectionisprovided.(5)DescribethepathsoftheminimumflowlinesfromeachECCSpumpdischargetothelineend.Thisdescriptionshouldidentifyallvalvesintheselines,thesignalsthatcontroleachvalve,thepowersourcesforeachvalve,andthequali-ficationofeachvalve.Response5:TheflowpathsforthesepumpsareshownonRGEEdrawings33013-425,SafetyInjectionSystem,and33013-436,AuxiliaryCoolantSystem(attached).ThesafetyinjectionpumpseachhaveaminimumflowlinereturningtotheRWST.Thethreelinesjoinupstreamoftwoseriesair-operatedvalves,AOV897andAOV898.Thesevalvesdonotreceiveanactuationsignal;however,theyareinterlockedwithmotor-operatedvalves857A,B,andCsuchthatthedischargeoftheRHRpumpscannotbeconnectedwiththesuctionoftheSIpumpsuntilAOV897and898areclosed.ThesolenoidAOV897ispoweredfrominstrumentbus1B;AOV898frominstrumentbus1D.Thesevalvesfail-closedonlossofpowerorair.TheContainmentSpraypumpshavearecirculationlinefromthedischargetothesuctionofthepumps,withmanuallocked-openvalves.TheRHRpumpsrecirculatefromthedischargeofthepumpsthroughtheRHRheatexchangers,andthroughacommonlineviarecirculationorificeFE628tothesuctionofthepumps.Thesearenovalvesintherecirculationpath.(6)Foreachminimumflowlinethatreturnstoapointotherthanthepumpintakepoint,provideasinglefailureanalysisandquantifytheoffsitedoserate,dose,anddoseassumptionsobtainingfromallsinglefailuresthatdonotisolatetheselinesduringtherecirculationphaseat,ECC.

'0It,~'ttt Response6:Asnotedinresponse5above,onlytheSIpumpsrecirculatebacktotheRWST.Redundantair-operatedvalves,whichfail-closed,areinterlockedwiththe857A,BandCvalvesinthelineleadingfromthedischargeoftheRHRtotheSIpumps.Nosinglefailurewouldthuspreventfailuretoclosethisminimumflowline.

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RWSTInformationTotalVolume=r338,000gal.Normal=300,000gal.TechSpecMin=230,000gal.BottomofRWST:236'2"PumpInletNozzle:237'8"--',lOSLevel:244'6"I31%Level:262'0"TankI.D.=26.45'olume/Ft=4;110gal.VolumetoPumpInletNozzle=6,165gal.Volumeto10%Level'=34,250gal.olumeto31%Level=106,175gal.-~Vgag/A'{'jSM'KrhlLlIvv%GGODWNK