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'NFORMATION DISTRIt3UT YSTEM(RIDS)ACCESSION NBR:8509100061-DOC~DATE:85/09/04NOTARIZED:=

NODOCKETACIL'.50.

410NineMilePointNuclear"Stationi Unit2E:NiagaraMoha05000410AUTHI,NAME AUTHORAFFILIATION MANGANECO-Vs=

NiagaraMohawks,Power Corp'.RECIPONAMEt RECIPIENT:

AFFILIATION BUTLER'S'j1t

~'icensing.

Branch2"SUBJECT!ForwardsFSARchangesrequested bySinghChanges.providedtocloseoutSEROpenI.teip"12'.re'lternate) shutdowncapability..

FuturetamendofFSARwillincorpot'ate changes;DISTRIBUTION CODE:S001DCOPIESRECEIVEDILiTR J'NCLJ.01ZE:l"'p'ITLE".Licensing Submittal0'SAR/FSAR Amdts8,RelatedCo>re'spondence NOTES:RECIPIENT IDCODE/NAtlEl NRR/OL/ADL NRR"LB2'ACOPIESRECIPIENT LTTRENCLi.IDCODE/NAME' 0NRRLB2BC10HAUGHEYiM 01COPIESLT'TRENCL"101l~INTERNAL:

ACRS41ELO/HDS3>>

IE/DEPER/EPB 36'RRROE'AL'RR/DE/CEB 11'RR/OE/EQB 131NRR/DE/MEB 18NRR/DE/SAB 24NRR/DHFS/HFEB40.

NRR/DHFS/PSRB NRR/OSI"/AEB

'26NRR/OSI/CPB 10NRR/DSI/ICSB 16NRR/DSI'/PSB19NRR/DSI/RSB 23>>RGN1EXTERNAL:

?4XDMB/OSS(AMOTS).NRCPDR02!PNLiGRUEL'ER66101~1"1122"1111<<1111111111111311.111111ADA/LFMBIE".FILE'E/DQAVT/QAB21 NRR/DE/AEAB NRR/DE/EHEB NRR/DE/GB 28NRR/DE/MTEB 17NRR/DE/SGEB 25NRR/DHFS/LQB 32"NRR/DL/SSPB NRR/DSI/ASB NRR/DSI/CSB 09'RR/DSI/METB 12"NRR'AB22'4RM/ODAMI/MI BBNL(AMOTS ONLY)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/300 ERIEBOULEVARD WEST,SYRACUSE.

N,Y.13202/TELEPHONE (315)474-1511September 4,1985(NMP2L0486)Mr.WalterButler,ChiefLicensing BranchNo.2U.S.NuclearRegulatory Commission Washington, OC20555

DearMr.Butler:

Re:NineMilePointUnit2DocketNo.50-410Enclosedarechangesrequested byMr.Singhofyourstaff.ThechangesareprovidedtocloseoutSafetyEvaluation ReportOpenItem12.Thesechangeswillbeincorporated intoafutureamendment oftheFinalSafetyAnalysisReport.Verytrulyyours,C.V.ManganSeniorVicePresident BB/rlaEnclosure 0925Gxc:R.A.Gramm,NRCResidentInspector ProjectFile(2)8509i'00061 850904'PDRADOCK050004i0E'.PDR'

NineMilePointUn'AR7.4SYSTEMSREQUIREDFORSAFESHUTDOWN7.4.1Description Thissectiondiscusses theinstrumentation andcontrolsofthefollowing systemswhichcanbeusedforsafeplantshutdown:

1.Reactorcoreisolation coolingsystem(RCIC).2.Standbyliquidcontrolsystem{SLCS).3.RHRshutdowncoolingmode(RSCM).4.Remoteshutdownsystem{RSS).Thesourcesthatsupplypowertothesafeshutdownsystemsoriginate fromonsiteac/dcsafety-related buses.RefertoChapter8foracompletediscussion ofthesafety-related powersources.7.4.1.1ReactorCoreIsolation CoolingSystemSstemFunctionTheRCICsystemisdesignedtoassurethatsufficient reactorwaterinventory ismaintained inthereactorvesselthusassuringcontinuity ofcorecooling.Reactorvesselwaterismaintained orsupplemented byRCICsystemduringthefollowing conditions:

1.Whenthereactorvesselisisolatedandmaintained inthehotstandbycondition.

Whenthereactorvesselisisolatedandaccompanied byalossofnormalcoolantflowfromthereactorfeedwater system.Whenacompleteplantshutdownunderconditions oflossofnormalfeedwater systemisstartedbeforethereactorisdepressurized toalevelwherethereactorshutdowncoolingmodeoftheRHRsystemcanbeplacedintooperation.

Sstem0erationSchematic arrangements ofsystemmechanical equipment andinstrumentation andadescription ofsystemdesignandoperation areprovidedinSectionS.4.6.Theinstrumentation specifications arelistedinTable7.4-1'.ThecontrollogicisshownonFigure7.4-1.7.4-1

~0 4kResonAsshownonFSARFigure9B.4-2,theapproachusedforNMP2issimilartothatdescribed above.Thereactoriseithermanuallyorautomatically scramed.Thenoneoffourtrainsareusedtoprovidemakeupwateranddecayheatremoval.EitherHPCSorRCICisusedforhighpressuremakeup.IfablowdownweretooccureitherthroughtheADSorreliefvalves,makeupwouldbeprovidedusingthelowpressure systems(LPCSorLPCI);Additionally, decayheatremovalisprovidedbytheRHRsystem.Intheeventofafireinthecontrolroomorrelayroomwhichforcesevacuation ofthecontrolroom,sufficient equipment toenablehotandcoldshutdownisprovidedattheremoteshutdownpanels(FSARSection7.4)andthroughtheuseoflocalcontrol.Viability ofthesecircuitsisassuredbytheuseoftransferswitcheswhicnelectrically isolatethecontrolroomandtransfercontroltothelocalpanelsandtheremoteshutdownpanels.Redundant andisolatedfusesareprovided(intheemergencyswitchgear rooms)tomaintainthepowersourcetothesecircuits.

12.Thedescription ofthesystemsorportionsthereofusedtoprovidetheshutdowncapability andmodifications requiredtoachievealternate shutdowncapability ifrequired.

~ResenseAppendix98andSection7.4oftheFSARprovidedescriptions oftheshutdownsystemsandmodifications andalternate shutdowncapability fromtheremoteshutdownroom.

ATTACHMENT le0Hih/LowPressureInterfaces SternBoundaries OER-Reactor BuildingEquipment Drain2OER~V128 MSS-MainSteam2MSS*MOV112 2MSS+HYV6A,B,C,D 2HSS+HYV7A,B,C,D RHS-ResidualHeatRemoval2RHS*MOV22A, B2RHSAOV80A, B2RHS*MOV113 2RHS*MOV67A,B 2RHS*MOV32A,B WCS-ReactorWaterCleanup2WCS-MOV106 2WCS-MOV107 2WCS-AOV26A,B,C,O 2WCS-AOV28A,B,C,O 2WCS-AOV29A,B,C,O 2WCS-AOV30A,B,C,O 2WCS-AOV44A,B,C,D 2WCS-AOV51A,B,C,O 2WCS-AOV52A,B,C$

02WCS-AOV53A,B,C,O 2WCS-AOV54A,B,C,O 2WCS-AOV61A,B,C,O Notes:DescritionWCSDrainValveMainSteamDrainMainSteamIsolation HainSteamIsolation SteamSupplytoRHS*ElSteamSupplytoRHS*ElShutdownCoolingSuctionShutdownCoolingReturnRHS*ElReturntoICSDraintoLiquidWasteDraintoMainCondenser Demineralizer Vent/Drain Oemineralizer Vent/Drain Demineralizer Vent/Drain Oemineralizer Vent/Drain Demineralizer Vent/Drain Oemineralizer Vent/Drain Oemineralizer Vent/Drain Demineralizer Vent/Drain Oemineralizer Vent/Drain Oemineralizer Vent/Drain Resolution Note1Note1Note3Note3Note1Note1Note1Note1Note1Note1Note1Note2Note2Note2Note2Note2Note2Note2Note2Note2Note21)2)3)Atleastonevalveisde-energized anddisconnected frompowersource(breakeropen)duringnormalplantoperation.

Nosinglefirecouldcausesufficient spuriousoperations toviolatethehigh/lowpressureinterface inthisflowpathsincethesevalvesarecontrolled fromlocalpanelswhicharelocatedinaseparatefireareafromthecontrolroom.Thesevalvesarenormallyopen.Intheeventofacontrolroomfire,asdefinedbytheAppendixRcriteria, theyareclosedbytheoperatorandsubsequently disconnected fromtheir.powersourcetoensurenospuriousoperation.

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