ML17325A285

Application for one-time Interpretation of Tech Spec 3.5.2.e to Allow ECCS Subsystem Flow Path to Be Considered Operable W/Flow from RHR Pump Aligned to Deliver Flow to Only Two of Four RCS Loops.Fee Paid

ML17325A285
Person / Time
Site:	Cook
Issue date:	09/11/1987
From:	ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	MURLEY T E NRC, NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
AEP:NRC:1024B, NUDOCS 8709170267
Download: ML17325A285 (6)

Text

ACCESSIONNBRFACIL:50-315AUTH.NAMEALEXICHORM.P.RECIP.NAMEMURLEYiT.E.REQULATO'NFORMATIONDISTRIBUTIONSTEM(RIDS)8709170267DOC.DATE:87/O'P/11NOTARIZED:NODOCKET0DonaldC.CookNuclearPoeerPlantiUnitiiIndianah05000315AUTHORAFFILIATIONIndiana5MichiganElectricCo.RECIPIENTAFFILIATIONDocumentControlBranch<DocumentControlDesk)

SUBJECT:

Requestsone-timeinterpretationofUnit1TechSpec3.5.2.etoallowECCSsubsystemfloepathtobeconsideredoperablew/floefromRHRpumpalignedtodeliverfloetoonlytwooffourreactorcoolantsosloops.Feepaid.DISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTR(ENCL0SIZE:TITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-3LAWIQQINGTONeDINTERNAL:ARM/DAF/LFMBNRR/DEST/CEBNRR/DEBT/RSBNRRLRBQFILE01EXTERNAL:EGS(GBRUSKEeSNRCPDRCOPIESLTTRENCLRECIPIENTIDCODE/NAMEPD3-3PDNRR/DEBT/ADSNRR/DEST/MTBNRR/DOEA/TSBOQC/HDS1RES/DE/EIBLPDRNSICCOPIESLTTRENCLTOTALNUMBEROFCOPIESREQUIRED:LTTR21ENCL vC.Q>>g'(-tp"h>>4'(I, INDIANA8MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS,OHIO43216September11,1987AEP'NRC:1024BDonaldC.CookNuclearPlantUnit1DocketNo.50-315LicenseNo.DPR-58RHRCROSS-TIESURVEILLANCE:REQUESTFORONE-TIMETECHNICALSPECIFICATIONINTERPRETATIONU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.E.Murley

DearDr.Murley:

PursuanttodiscussionswithyourstaffonSeptemberll,1987,thepurposeofthisletteristorequestaone-timeinterpretationofUnit1TechnicalSpecification(T/S)3.5.2.e.TheinterpretationwouldallowanECCSsubsystemflowpathtobeconsideredoperablewithflowfromaresidualheatremoval(RHR)pumpalignedtodeliverflowtoonlytwoofthefourreactorcoolantsystemloops,providedthesafetyinjection(SI)systemisalignedsuchthateachSIpumpcandeliverflowtoallfourreactorcoolantsystemloops.BackroundT/S3.5.2statesthattwoemergencycorecoolingsystem(ECCS)subsystemsmustbeoperable;itdefinesanoperableECCSsubsystemasincludingoneoperableSIpump,oneoperableRHRpump,andassociatedflowpaths.ThisT/SallowstheoperatortoremoveoneECCSsubsystemforupto72hourswhileinModes1,2,or3whilemaintaininganoperableflowpathfortheopposingsubsystem.TheRHRandsafetyinjection(SI)pumpconfigurationattheD.C.CookPlantissuchthatanyonepumpcandeliverflowtoallfourreactorcoolantloops.Thisisaccomplishedbymeansofcross-tievalves.Withthecross-tievalvesclosed,eachpumpcanonlysupplyflowtotworeactorcoolantloops.Thecurrentsmall-breakandlarge-breakLOCAanalysesforD.C.CookUnit1assumethatthecross-tievalvesintheSIandRHRlinesareopen.Thisrequiresthatthecross-tievalvesbeopentosatisfytheoperableflowpathrequirementofT/S3.5.2.eforModes1,2,and3.I'109170'2'70'1>iPDRAQOCN,05000315P00((g+A[pi<'s~i)o 4~~

Dr.T.E.Murley-2-AEP:NRC:1024BInthepast,therewereinstanceswhereD.C.CookUnit1wasoperatedinModes1,2,or3withthecross-tievalvesclosed.Thevalveswereclosedtoallowmaintenanceworktobeperformedonvarioussystemcomponents.Becausethisoperationwasnotinagreementwiththeexistingsafetyanalyses,itwasthesubjectofanEnforcementConferenceheldatRegionIIIheadquartersonJanuary21,1987.SincesomemaintenanceworkcanonlybeperformedontheRHRorSIsystemsinModes1,2,or3withthecross-tievalvesclosed,wedecidedtopursuenewanalyseswhichwouldsupporttwo-loopinjection.ThenewanalysesweresubmittedinourlettersAEP:NRC:1024,datedMarch23,1987,andAEP:NRC:1024A,datedMay13,1987.TheanalysespresentedintheseletterssupportedclosingofeithertheSIsystemcross-tievalvesortheRHRsystemcross-tievalves,butnotboth.Thenewanalysesinvolvedlarge-breakLOCAevaluationsfortheRHRcross-tievalves,andsmall-breakLOCAevaluationsfortheSIcross-tievalves.IndiscussionswithyourstaffonJuly29,1987wewereinformedthatthestaffhadnoproblemswiththeRHR(large-break)analysesbuthadremainingquestionsontheSI(small-break)analyses.Adraftresponsetothestaff'squestionsontheSIevaluationhasbeenreceivedfromWestinghouseElectricCorporation,andiscurrentlyunderourreview.ThedraftindicatesthatthesmallbreakLOCAanalyseswesubmittedinourlettersAEP:NRC:1024andAEP:NRC:1024Aremainvalid,andthattheSIcross-tievalvesshouldbeallowedtobeclosed.ReasonForReuestOnSeptember11,1987,it.wasdeterminedthatavalveintheUnit1RHRsystemwouldneedtoberepaired.D.C.CookUnit1iscurrentlyreturningtooperationfollowingrefueling.RepairingthevalveinMode3(ratherthanMode4)willsaveapproximately36hoursofcriticalpathtimebutwillrequiretheRHRcross-tievalvestobeclosed.Webelievetheanalyseswehavepreviouslysubmittedsupportthisoperation(providedtheSIcross-tievalvesremainopen).AdditionallywenotethatsinceD.C.CookUnit1isreturningfromarefuelingoutage,decayheatinthecoreisminimalwhichfurthersupportsourconclusionthattheRHRcross-tievalvescansafelybeclosed.AlthoughwehavebeeninformallytoldthatthestaffhasnoproblemswiththeRHRanalysis,thenewanalysishasneverbeenformallyapprovedbytheNRC.Forthisreason,we,arerequestingaone-timeinterpretationofT/S3.5.2.esuchthatwemayoperatewiththeRHRcross-tievalvesclosedwhileinMode3incidenttotherequiredvalvemaintenance.Pursuanttotherequirementsof10CFR170.12(c),wehaveenclosedanapplicationfeeof$150.00fortheproposedinterpretation.

Dr.T.E.Murley-3-AEP'NRC:1024BThisdocumenthasbeenpreparedfollowingCorporateprocedureswhichincorporateareasonablesetofcontrolstoinsureitsaccuracyandcompletenesspriortosignaturebytheundersigned.Verytrulyyours,M.P.AlexichVicePresidentcc:JohnE.DolanW.G.Smith,Jr.-BridgmanR.C.CallenG.BruchmannG.CharnoffNRCResidentInspector-BridgmanA.B.Davis-RegionIII