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

REGULATORl NFORMATION DISTRIBUTION Sf'EM(RIDS)ACCESSION NBR:8411050270 DOC~DATE:84/10/30NOTARIZED:

NODOCKETFACIL;50-244 RobertEmmetGinnaNuclearPlantpUnit1iRochester G05000244AUTHBYNAMEAUTHORAFFILIATION K08ERiR~l'IeRochester Gas8,ElectricCorp'ECIP

~NAME-RECIPIENT AFFILIATION ZHOLINSKI J,Operating ReactorsBranch5

SUBJECT:

AdvisesthataddiTechSpecreleaktestofcontainment purge/vent valvesunnecessary<based onpreviousoperating experience Noexistingpurgevalvewillserveascontainment isolation valvefollowing Spring1986,DISTRIBUTION CODE:A034DCOPIESRECEIVED:LTR "ENCLSIZE:TITLE:ORSubmittal:

Containment PurgingNOTES:NRR/DL/SEP 1cy,OL$09/19/6905000244RECIPIENT IDCODE/NAME NRRORB5BC01INTERNAL:

ADM/LFMBNRRREEVESiENRR/DSI/AEBRGN1COPIESLTTRENCL,RECIPIENT

'DCODE/NAME NRRFIELDS'12NRR/DE/EQB 0904COPIESLTTRENCLEXTERNAL:

ACRSNRCPDRNTISNOTES:13-02LPDRNSIC0305TOTALNUMBEROFCOPIESREQUIRED:

LTTR25ENCL

<<IlWrI44~<<s\I<<11il',ttkIt~Ill<<'4'IWItf~IrfxfIWfk'lllxk~hx<<WkfW4il 4tj/IIIIIIIIII tIIIIIIIIII stvaROCHESTER GASANDELECTRICCORPORATION o89EASTAVENUE,ROCHESTER, N.Y.14649-0001 ROGERW.KOBERVICEPRESIDENT ELECTRICRSTEAMPRODUCTION TELEPIIONE AREAcoDETls546-2700October30T1984DirectorofNuclearReactorRegulation Attention:

Mr.JohnZwolinski~

ChiefOperating ReactorsBranchNo.5U.S.NuclearRegulatory Commission Washington, D.C.20555

Subject:

Containment PurgeandVentR."E.GinnaNuclearPowerPlantDocketNo.50-244

DearMr.Zwolinski:

ThisletterisinresponsetoaletterdatedJune,21,1984fromDennisM.Crutchfield<

USNRCTwhichtransmitted aSafetyEvaluation regarding theGenericIssueonContainmc~nt Purgeand<VentOperation.

Theletterrequested thatweproosea'Zdchnical Specification requiring leaktestingofthecontainment purge/vent valvesatintervals nottoexceedsixmonthsor~toproposeanalternative.

Asdiscussed below>wedonotbelievethatanyadditional Technical Specifications arene~essaryatthistime.\Leaktestdataforthecontainmeng,purge valvesforthelast21/2yearswerereviewedtodetermine"causes foranypreviousexcessive leakageandtopredict'lone]-term performance of'heepurgevalves.IthasbeenconcludeI'hattheonlyoccurrences ofxcessiveleakagewereafterthevaveshadbeenopenedforpurgingfollowing readtorwhutdggnndcooldowntocoldshutdown.

Ithasbeenpostulated thatleakagwas,'dueto'thecool4owqofthecontainment atmosphere asaresu'ltofpreparations fortheannua'1refueling outage.Ontheotherhanioncethy.purgevalveswereclosedpriortostartupfromtheoutage<'he testdatademonstrate thatsuccessful operation withaccepblyp/owleakageismain-tainedthroughout theannualoperating cyclewithnorepairsoradjustments beingnecessary.

Forexampezfollowing startupin1982,acceptable resultswereobtainedntestingperformed onselectedvalvesinAugustandOctober,982andinJanuary1983.Following closureofthevalveswithacceptable leaktightness priortostartupfromthe1983outage>testingwasnextperformed inApril1984~thusdemonstrating theqacceptable performance throughout thatoperating cycle.Thus~thereisnoevidencethattheGinnapurgevalveswillnotmeetthleakagerequirements throughout theannualoperating cycle.(PDRADOCKo84i030<<ii0SOirOp05000g4yPDR Ct~Eh'II,F*%V~~aawt<~4Ok'Yp)Pl~pfs~'HL ROCHESTER GASANDELECTRICCORP.oATEOctober30<1984TOMr.JohnZwolinski SHEETNO.Anadditional factorwhichsupportsourconclusion tonotsubmitaproposedTechnical Specification atthistimerelatestoourcurrentplansforupgrading thecontainment purge/vent system.Sinceouroriginalsubmittals<

inwhichweanticipated areplace-mentwithupgradedandqualified purgevalves<wehaveconcluded thataminipurge system<employing 6"valves>wouldprovideamorecosteffective approach.

Wehavealsotentatively decidedtoreplacethepurgesupplyandexhaustvalveswhichareinsidecontainment withblankflanges.Sinceitisourintention toprovidetheseflangeswithadoubleseal>itwouldnolongerbenecessary torelyontheoutervalvesforcontainment isolation.

Duringcoldorrefueling shutdown>

theflangescouldberemovedandtheoutervalveswouldberelieduponforrefueling integrity.

Wecurrently expecttocompletethedesigninordertosupportmodifications duringthe1986refueling outage.Theproposedchangeinthecurrentpurgeconfiguration wouldinvolveachangeinTechnical Specification Table3.6-1.Consistent withotherpenetrations<

weanticipate proposing anannualtestcyclefortheminipurge penetrations andtheflangedoubleseals.Insummary<basedonpreviousoperating experience andbasedonthefactthattheexistingpurgevalveswillnotserveascontainment isolation valvesfollowing theSpring1985outage>priortowhichonlyonetestwouldbeperformed asaresultoftherequested Technical Specification>

wedonotbelievethataproposedTechnical Specification isnecessary atthistime.Verytrulyyours<A'J~RogerW.Kober hyNW'Ikkl'r