ML17261B059

Advises That No Interlocks Required for RHR motor-operated Valves 701 & 720 Based on Present Arrangement.Listed Failures Would Have to Occur in Order for Potential Overpressurization of RHR Sys to Occur

ML17261B059
Person / Time
Site:	Ginna
Issue date:	04/17/1990
From:	MECREDY R C ROCHESTER GAS & ELECTRIC CORP.
To:	JOHNSON A R Office of Nuclear Reactor Regulation
References
TASK-05-11.B, TASK-5-11.B, TASK-RR GL-89-10, NUDOCS 9005020083
Download: ML17261B059 (4)

Text

ACCELERATED DISTjUBUTION DEMONSHRATION SYSTEMREGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS)ACCESSION NBR:9005020083 DOC.DATE:

90/04/17NOTARIZED:

NOFACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester GAUTH.NAMEAUTHORAFFILIATION MECREDY,R.C.

Rochester Gas6ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION JOHNSON,A.R.

ProjectDirectorate I-3

SUBJECT:

Advisesthatnointerlocks arerequiredforRHRvalvesMOV7016MOV720atplant,per NRCSERforSEPTopicV-ll.B.DISTRIBUTION CODE,AEOIDCOPIESRECEIVED,LTR 2ENCL0SIZE.TITLE:Correspondence reSEPTopicsNOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72).

DOCKET05000244S05000244,

/RECIPIENT IDCODE/NAME JOHNSON,A INTERNAL:

NUDOCS-ABS~

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LPDRNSICCOPIESLTTRENCLRECIPIENT IDCODE/NAME OGC/HDS2NRCPDRCOPIESLTTRENCL'DRDSNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTElCONTACTTHE,DOCUMENTCONTROLDESK,ROOMPI-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISISFORDOCUMENTS YOUDON'TNEEDIgTOTALNUMBEROFCOPIESREQUIRED:

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,zsizzpsvze,>i,~zrurzi/pzrzizu'~YOTklizsiiriziz ROCHESTER GASANDELECTRICCORPORATION o89EASTAVENUE,ROCHESTER, NK146490001YORKiYKYRApril17,1990YCLKPHONE KDKKCOOKYYO546.2700U.S.NuclearRegulatory Commission DocumentControlDeskAttn:AllenR.JohnsonProjectDirectorate I-3Washington, D.C.20555

Subject:

LackofInterlocks onRHRValvesMOV701and.MOV720R.E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Johnson:

IntheNRC'sSafetyEvaluation ReportforSEPTopicV-11.B,"RHRInterlock Requirements",

datedSeptember 29,1981,itwasdetermined thatthelackofinterlocks onRHRMOVs701andMOVs720wasacceptable.

Severalreasonswerestatedforthis,asfollows:~TheRHRvalvesaredesignedsuchthattheyarephysically unabletoopenagainstadifferential pressuregreaterthan500psi~Byadministrative procedure, theRHRvalvesarekey-locked closed,withpowerremoved~Areliefvalve,setat600psig,isavailable intheRHRsystem.InthecourseofRG&E'simplementation ofourMOVtestingprogram,usingtheguidanceofGenericLetter89-10,ithasbeendetermined, thatMOVs701and720willopenagainstadifferential pressureofgreaterthan500psi.Nonetheless, RGGEconsiders that,withthepresentarrangement, nointerlocks arerequiredforthesevalves.Inorderforapotential overpressurization oftheRHRsystemtooccur,thefollowing setoffailureswouldhavetooccur:(Note:a.schematic oftheRHRsystemisshownonUFSARFigure5.4-7.)1.Powerwould.havetobedeliberately restoredatthebreaker,inviolation ofprocedure A-52.2Theinterlocked in-boardvalves(MOV700orMOV721)wouldhavetofailtoallowsignificant leakage.Thisisconsidered oflowprobability, sincethesevalvesareintheGinnaPumpandValveInservice TestingProgram,andareleak-tested onanannualbasisusinrocedurePT-8.3.gpPDRADOCK00000244P~gg/~g~P~PggPb.g2S'8CO2.Thekey-locked switchwouldhavetobeenabled,andthevalveopened,inviolation ofnormalalignment procedures J4.~~ReliefvalveRV-203,withacapacityof70,000lb/hr,wouldhavetofail.Thisreliefvalvehasbeentestedannually(RSSP-12) forseatleakageandsetpointverification.

Thus,itisconsidered thatthecapability ofMOVs701and720toopenagainstadifferential pressureofgreaterthan500psi,withouttheavailability ofinterlocks onthesevalves,remainsacceptable, anddoesnothaveasignificant implication forpublichealthandsafety.Thisinformation willbereflected inthenextrevisionoftheGinnaStationUFSAR.Verytrulyyours,RobertC.MecredDivisionManagerNuclearProduction GJWN099xc:Mr.AllenR.Johnson(MailStop14D1)ProjectDirectorate I-3Washington, D.C.20555U.S.NuclearRegulatory Commission RegionI475Allendale Road".KingofPrussia,PA19406GinnaSeniorResidentInspector