ML17254B004

Advises That Addl Tech Spec Re Leak Test of Containment Purge/Vent Valves Unnecessary,Based on Previous Operating Experience.No Existing Purge Valve Will Serve as Containment Isolation Valve Following Spring 1986

ML17254B004
Person / Time
Site:	Ginna
Issue date:	10/30/1984
From:	KOBER R W ROCHESTER GAS & ELECTRIC CORP.
To:	ZWOLINSKI J Office of Nuclear Reactor Regulation
References
NUDOCS 8411050270
Download: ML17254B004 (6)

Text

REGULATORlNFORMATIONDISTRIBUTIONSf'EM(RIDS)ACCESSIONNBR:8411050270DOC~DATE:84/10/30NOTARIZED:NODOCKETFACIL;50-244RobertEmmetGinnaNuclearPlantpUnit1iRochesterG05000244AUTHBYNAMEAUTHORAFFILIATIONK08ERiR~l'IeRochesterGas8,ElectricCorp'ECIP~NAME-RECIPIENTAFFILIATIONZHOLINSKIJ,OperatingReactorsBranch5

SUBJECT:

AdvisesthataddiTechSpecreleaktestofcontainmentpurge/ventvalvesunnecessary<basedonpreviousoperatingexperienceNoexistingpurgevalvewillserveascontainmentisolationvalvefollowingSpring1986,DISTRIBUTIONCODE:A034DCOPIESRECEIVED:LTR"ENCLSIZE:TITLE:ORSubmittal:ContainmentPurgingNOTES:NRR/DL/SEP1cy,OL$09/19/6905000244RECIPIENTIDCODE/NAMENRRORB5BC01INTERNAL:ADM/LFMBNRRREEVESiENRR/DSI/AEBRGN1COPIESLTTRENCL,RECIPIENT'DCODE/NAMENRRFIELDS'12NRR/DE/EQB0904COPIESLTTRENCLEXTERNAL:ACRSNRCPDRNTISNOTES:13-02LPDRNSIC0305TOTALNUMBEROFCOPIESREQUIRED:LTTR25ENCL

<<IlWrI44~<<s\I<<11il',ttkIt~Ill<<'4'IWItf~IrfxfIWfk'lllxk~hx<<WkfW4il 4tj/IIIIIIIIIItIIIIIIIIIIstvaROCHESTERGASANDELECTRICCORPORATIONo89EASTAVENUE,ROCHESTER,N.Y.14649-0001ROGERW.KOBERVICEPRESIDENTELECTRICRSTEAMPRODUCTIONTELEPIIONEAREAcoDETls546-2700October30T1984DirectorofNuclearReactorRegulationAttention:Mr.JohnZwolinski~ChiefOperatingReactorsBranchNo.5U.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

ContainmentPurgeandVentR."E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Zwolinski:

ThisletterisinresponsetoaletterdatedJune,21,1984fromDennisM.Crutchfield<USNRCTwhichtransmittedaSafetyEvaluationregardingtheGenericIssueonContainmc~ntPurgeand<VentOperation.Theletterrequestedthatweproosea'ZdchnicalSpecificationrequiringleaktestingofthecontainmentpurge/ventvalvesatintervalsnottoexceedsixmonthsor~toproposeanalternative.Asdiscussedbelow>wedonotbelievethatanyadditionalTechnicalSpecificationsarene~essaryatthistime.\Leaktestdataforthecontainmeng,purgevalvesforthelast21/2yearswerereviewedtodetermine"causesforanypreviousexcessiveleakageandtopredict'lone]-termperformanceof'heepurgevalves.IthasbeenconcludeI'hattheonlyoccurrencesofxcessiveleakagewereafterthevaveshadbeenopenedforpurgingfollowingreadtorwhutdggnndcooldowntocoldshutdown.Ithasbeenpostulatedthatleakagwas,'dueto'thecool4owqofthecontainmentatmosphereasaresu'ltofpreparationsfortheannua'1refuelingoutage.Ontheotherhanioncethy.purgevalveswereclosedpriortostartupfromtheoutage<'hetestdatademonstratethatsuccessfuloperationwithaccepblyp/owleakageismain-tainedthroughouttheannualoperatingcyclewithnorepairsoradjustmentsbeingnecessary.Forexampezfollowingstartupin1982,acceptableresultswereobtainedntestingperformedonselectedvalvesinAugustandOctober,982andinJanuary1983.Followingclosureofthevalveswithacceptableleaktightnesspriortostartupfromthe1983outage>testingwasnextperformedinApril1984~thusdemonstratingtheqacceptableperformancethroughoutthatoperatingcycle.Thus~thereisnoevidencethattheGinnapurgevalveswillnotmeetthleakagerequirementsthroughouttheannualoperatingcycle.(PDRADOCKo84i030<<ii0SOirOp05000g4yPDR Ct~Eh'II,F*%V~~aawt<~4Ok'Yp)Pl~pfs~'HL ROCHESTERGASANDELECTRICCORP.oATEOctober30<1984TOMr.JohnZwolinskiSHEETNO.AnadditionalfactorwhichsupportsourconclusiontonotsubmitaproposedTechnicalSpecificationatthistimerelatestoourcurrentplansforupgradingthecontainmentpurge/ventsystem.Sinceouroriginalsubmittals<inwhichweanticipatedareplace-mentwithupgradedandqualifiedpurgevalves<wehaveconcludedthataminipurgesystem<employing6"valves>wouldprovideamorecosteffectiveapproach.Wehavealsotentativelydecidedtoreplacethepurgesupplyandexhaustvalveswhichareinsidecontainmentwithblankflanges.Sinceitisourintentiontoprovidetheseflangeswithadoubleseal>itwouldnolongerbenecessarytorelyontheoutervalvesforcontainmentisolation.Duringcoldorrefuelingshutdown>theflangescouldberemovedandtheoutervalveswouldberelieduponforrefuelingintegrity.Wecurrentlyexpecttocompletethedesigninordertosupportmodificationsduringthe1986refuelingoutage.TheproposedchangeinthecurrentpurgeconfigurationwouldinvolveachangeinTechnicalSpecificationTable3.6-1.Consistentwithotherpenetrations<weanticipateproposinganannualtestcyclefortheminipurgepenetrationsandtheflangedoubleseals.Insummary<basedonpreviousoperatingexperienceandbasedonthefactthattheexistingpurgevalveswillnotserveascontainmentisolationvalvesfollowingtheSpring1985outage>priortowhichonlyonetestwouldbeperformedasaresultoftherequestedTechnicalSpecification>wedonotbelievethataproposedTechnicalSpecificationisnecessaryatthistime.Verytrulyyours<A'J~RogerW.Kober hyNW'Ikkl'r