ML18038A051

Forwards FSAR Changes Requested by Singh.Changes Provided to Close Out SER Open Item 12 Re Alternate Shutdown Capability. Future Amend of FSAR Will Incorporate Changes

ML18038A051
Person / Time
Site:	Nine Mile Point
Issue date:	09/04/1985
From:	MANGAN C V NIAGARA MOHAWK POWER CORP.
To:	BUTLER W Office of Nuclear Reactor Regulation
References
(NMP2L-0486), (NMP2L-486), NUDOCS 8509100061
Download: ML18038A051 (10)

Text

REGUL1t'NFORMATIONDISTRIt3UTYSTEM(RIDS)ACCESSIONNBR:8509100061-DOC~DATE:85/09/04NOTARIZED:=NODOCKETACIL'.50.410NineMilePointNuclear"StationiUnit2E:NiagaraMoha05000410AUTHI,NAMEAUTHORAFFILIATIONMANGANECO-Vs=NiagaraMohawks,PowerCorp'.RECIPONAMEtRECIPIENT:AFFILIATIONBUTLER'S'j1t~'icensing.Branch2"SUBJECT!ForwardsFSARchangesrequestedbySinghChanges.providedtocloseoutSEROpenI.teip"12'.re'lternate)shutdowncapability..FuturetamendofFSARwillincorpot'atechanges;DISTRIBUTIONCODE:S001DCOPIESRECEIVEDILiTRJ'NCLJ.01ZE:l"'p'ITLE".LicensingSubmittal0'SAR/FSARAmdts8,RelatedCo>re'spondenceNOTES:RECIPIENTIDCODE/NAtlElNRR/OL/ADLNRR"LB2'ACOPIESRECIPIENTLTTRENCLi.IDCODE/NAME'0NRRLB2BC10HAUGHEYiM01COPIESLT'TRENCL"101l~INTERNAL:ACRS41ELO/HDS3>>IE/DEPER/EPB36'RRROE'AL'RR/DE/CEB11'RR/OE/EQB131NRR/DE/MEB18NRR/DE/SAB24NRR/DHFS/HFEB40.NRR/DHFS/PSRBNRR/OSI"/AEB'26NRR/OSI/CPB10NRR/DSI/ICSB16NRR/DSI'/PSB19NRR/DSI/RSB23>>RGN1EXTERNAL:?4XDMB/OSS(AMOTS).NRCPDR02!PNLiGRUEL'ER66101~1"1122"1111<<1111111111111311.111111ADA/LFMBIE".FILE'E/DQAVT/QAB21NRR/DE/AEABNRR/DE/EHEBNRR/DE/GB28NRR/DE/MTEB17NRR/DE/SGEB25NRR/DHFS/LQB32"NRR/DL/SSPBNRR/DSI/ASBNRR/DSI/CSB09'RR/DSI/METB12"NRR'AB22'4RM/ODAMI/MIBBNL(AMOTSONLY)LPOR'03~NSIC050"1.1~11101121111111101'11111111011111"1TOTALNUMBEROFCOPIESREQUIRED:LTTR52ENCL' IivpIkr<<k(4~<<'l-4'("'Irgvr"44'"IlI"<<'(v,"iYtlr4&4<<<<444vI(f4Irk<<4~4g~I'f)Vf<<4<<vlY,f4V4F4k,~HTVvIj LITNIIINRAAVMOHAWKNIAGARAMOHAWKPOWERCORPORATION/300ERIEBOULEVARDWEST,SYRACUSE.N,Y.13202/TELEPHONE(315)474-1511September4,1985(NMP2L0486)Mr.WalterButler,ChiefLicensingBranchNo.2U.S.NuclearRegulatoryCommissionWashington,OC20555

DearMr.Butler:

Re:NineMilePointUnit2DocketNo.50-410EnclosedarechangesrequestedbyMr.Singhofyourstaff.ThechangesareprovidedtocloseoutSafetyEvaluationReportOpenItem12.ThesechangeswillbeincorporatedintoafutureamendmentoftheFinalSafetyAnalysisReport.Verytrulyyours,C.V.ManganSeniorVicePresidentBB/rlaEnclosure0925Gxc:R.A.Gramm,NRCResidentInspectorProjectFile(2)8509i'00061850904'PDRADOCK050004i0E'.PDR'

NineMilePointUn'AR7.4SYSTEMSREQUIREDFORSAFESHUTDOWN7.4.1DescriptionThissectiondiscussestheinstrumentationandcontrolsofthefollowingsystemswhichcanbeusedforsafeplantshutdown:1.Reactorcoreisolationcoolingsystem(RCIC).2.Standbyliquidcontrolsystem{SLCS).3.RHRshutdowncoolingmode(RSCM).4.Remoteshutdownsystem{RSS).Thesourcesthatsupplypowertothesafeshutdownsystemsoriginatefromonsiteac/dcsafety-relatedbuses.RefertoChapter8foracompletediscussionofthesafety-relatedpowersources.7.4.1.1ReactorCoreIsolationCoolingSystemSstemFunctionTheRCICsystemisdesignedtoassurethatsufficientreactorwaterinventoryismaintainedinthereactorvesselthusassuringcontinuityofcorecooling.ReactorvesselwaterismaintainedorsupplementedbyRCICsystemduringthefollowingconditions:1.Whenthereactorvesselisisolatedandmaintainedinthehotstandbycondition.Whenthereactorvesselisisolatedandaccompaniedbyalossofnormalcoolantflowfromthereactorfeedwatersystem.WhenacompleteplantshutdownunderconditionsoflossofnormalfeedwatersystemisstartedbeforethereactorisdepressurizedtoalevelwherethereactorshutdowncoolingmodeoftheRHRsystemcanbeplacedintooperation.Sstem0erationSchematicarrangementsofsystemmechanicalequipmentandinstrumentationandadescriptionofsystemdesignandoperationareprovidedinSectionS.4.6.TheinstrumentationspecificationsarelistedinTable7.4-1'.ThecontrollogicisshownonFigure7.4-1.7.4-1

~0 4kResonAsshownonFSARFigure9B.4-2,theapproachusedforNMP2issimilartothatdescribedabove.Thereactoriseithermanuallyorautomaticallyscramed.Thenoneoffourtrainsareusedtoprovidemakeupwateranddecayheatremoval.EitherHPCSorRCICisusedforhighpressuremakeup.IfablowdownweretooccureitherthroughtheADSorreliefvalves,makeupwouldbeprovidedusingthelowpressuresystems(LPCSorLPCI);Additionally,decayheatremovalisprovidedbytheRHRsystem.Intheeventofafireinthecontrolroomorrelayroomwhichforcesevacuationofthecontrolroom,sufficientequipmenttoenablehotandcoldshutdownisprovidedattheremoteshutdownpanels(FSARSection7.4)andthroughtheuseoflocalcontrol.Viabilityofthesecircuitsisassuredbytheuseoftransferswitcheswhicnelectricallyisolatethecontrolroomandtransfercontroltothelocalpanelsandtheremoteshutdownpanels.Redundantandisolatedfusesareprovided(intheemergencyswitchgearrooms)tomaintainthepowersourcetothesecircuits.12.Thedescriptionofthesystemsorportionsthereofusedtoprovidetheshutdowncapabilityandmodificationsrequiredtoachievealternateshutdowncapabilityifrequired.~ResenseAppendix98andSection7.4oftheFSARprovidedescriptionsoftheshutdownsystemsandmodificationsandalternateshutdowncapabilityfromtheremoteshutdownroom.

ATTACHMENTle0Hih/LowPressureInterfacesSternBoundariesOER-ReactorBuildingEquipmentDrain2OER~V128MSS-MainSteam2MSS*MOV1122MSS+HYV6A,B,C,D2HSS+HYV7A,B,C,DRHS-ResidualHeatRemoval2RHS*MOV22A,B2RHSAOV80A,B2RHS*MOV1132RHS*MOV67A,B2RHS*MOV32A,BWCS-ReactorWaterCleanup2WCS-MOV1062WCS-MOV1072WCS-AOV26A,B,C,O2WCS-AOV28A,B,C,O2WCS-AOV29A,B,C,O2WCS-AOV30A,B,C,O2WCS-AOV44A,B,C,D2WCS-AOV51A,B,C,O2WCS-AOV52A,B,C$02WCS-AOV53A,B,C,O2WCS-AOV54A,B,C,O2WCS-AOV61A,B,C,ONotes:DescritionWCSDrainValveMainSteamDrainMainSteamIsolationHainSteamIsolationSteamSupplytoRHS*ElSteamSupplytoRHS*ElShutdownCoolingSuctionShutdownCoolingReturnRHS*ElReturntoICSDraintoLiquidWasteDraintoMainCondenserDemineralizerVent/DrainOemineralizerVent/DrainDemineralizerVent/DrainOemineralizerVent/DrainDemineralizerVent/DrainOemineralizerVent/DrainOemineralizerVent/DrainDemineralizerVent/DrainOemineralizerVent/DrainOemineralizerVent/DrainResolutionNote1Note1Note3Note3Note1Note1Note1Note1Note1Note1Note1Note2Note2Note2Note2Note2Note2Note2Note2Note2Note21)2)3)Atleastonevalveisde-energizedanddisconnectedfrompowersource(breakeropen)duringnormalplantoperation.Nosinglefirecouldcausesufficientspuriousoperationstoviolatethehigh/lowpressureinterfaceinthisflowpathsincethesevalvesarecontrolledfromlocalpanelswhicharelocatedinaseparatefireareafromthecontrolroom.Thesevalvesarenormallyopen.Intheeventofacontrolroomfire,asdefinedbytheAppendixRcriteria,theyareclosedbytheoperatorandsubsequentlydisconnectedfromtheir.powersourcetoensurenospuriousoperation.

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