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

ACCESSION NBRFACIL:50-315AUTH.NAMEALEXICHORM.P.RECIP.NAMEMURLEYiT.E.REQULATO'NFORMATION DISTRIBUTION STEM(RIDS)8709170267 DOC.DATE:87/O'P/11NOTARIZED:

NODOCKET0DonaldC.CookNuclearPoeerPlantiUnitiiIndianah05000315AUTHORAFFILIATION Indiana5MichiganElectricCo.RECIPIENT AFFILIATION DocumentControlBranch<Document ControlDesk)

SUBJECT:

Requestsone-timeinterpretation ofUnit1TechSpec3.5.2.etoallowECCSsubsystem floepathtobeconsidered operablew/floefromRHRpumpalignedtodeliverfloetoonlytwooffourreactorcoolantsosloops.Feepaid.DISTRIBUTION CODE:A001DCOPIESRECEIVED:

LTR(ENCL0SIZE:TITLE:ORSubmittal:

GeneralDistribution NOTES:RECIPIENTIDCODE/NAME PD3-3LAWIQQINGTONe DINTERNAL:

ARM/DAF/LFMB NRR/DEST/CEB NRR/DEBT/RSB NRRLRBQFILE01EXTERNAL:

EGS(GBRUSKEeSNRCPDRCOPIESLTTRENCLRECIPIENT IDCODE/NAME PD3-3PDNRR/DEBT/ADS NRR/DEST/MTB NRR/DOEA/TSB OQC/HDS1RES/DE/EIB LPDRNSICCOPIESLTTRENCLTOTALNUMBEROFCOPIESREQUIRED:

LTTR21ENCL vC.Q>>g'(-tp"h>>4'(I, INDIANA8MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS, OHIO43216September 11,1987AEP'NRC:1024B DonaldC.CookNuclearPlantUnit1DocketNo.50-315LicenseNo.DPR-58RHRCROSS-TIE SURVEILLANCE:

REQUESTFORONE-TIMETECHNICAL SPECIFICATION INTERPRETATION U.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Attn:T.E.Murley

DearDr.Murley:

Pursuanttodiscussions withyourstaffonSeptember ll,1987,thepurposeofthisletteristorequestaone-timeinterpretation ofUnit1Technical Specification (T/S)3.5.2.e.Theinterpretation wouldallowanECCSsubsystem flowpathtobeconsidered operablewithflowfromaresidualheatremoval(RHR)pumpalignedtodeliverflowtoonlytwoofthefourreactorcoolantsystemloops,providedthesafetyinjection (SI)systemisalignedsuchthateachSIpumpcandeliverflowtoallfourreactorcoolantsystemloops.BackroundT/S3.5.2statesthattwoemergency corecoolingsystem(ECCS)subsystems mustbeoperable; itdefinesanoperableECCSsubsystem asincluding oneoperableSIpump,oneoperableRHRpump,andassociated flowpaths.ThisT/SallowstheoperatortoremoveoneECCSsubsystem forupto72hourswhileinModes1,2,or3whilemaintaining anoperableflowpathfortheopposingsubsystem.

TheRHRandsafetyinjection (SI)pumpconfiguration attheD.C.CookPlantissuchthatanyonepumpcandeliverflowtoallfourreactorcoolantloops.Thisisaccomplished bymeansofcross-tie valves.Withthecross-tie valvesclosed,eachpumpcanonlysupplyflowtotworeactorcoolantloops.Thecurrentsmall-break andlarge-break LOCAanalysesforD.C.CookUnit1assumethatthecross-tie valvesintheSIandRHRlinesareopen.Thisrequiresthatthecross-tie valvesbeopentosatisfytheoperableflowpathrequirement ofT/S3.5.2.eforModes1,2,and3.I'109170'2'70'1>i PDRAQOCN,05000315P00((g+A[pi<'s~i)o 4~~

Dr.T.E.Murley-2-AEP:NRC:1024B Inthepast,therewereinstances whereD.C.CookUnit1wasoperatedinModes1,2,or3withthecross-tie valvesclosed.Thevalveswereclosedtoallowmaintenance worktobeperformed onvarioussystemcomponents.

Becausethisoperation wasnotinagreement withtheexistingsafetyanalyses, itwasthesubjectofanEnforcement Conference heldatRegionIIIheadquarters onJanuary21,1987.Sincesomemaintenance workcanonlybeperformed ontheRHRorSIsystemsinModes1,2,or3withthecross-tie valvesclosed,wedecidedtopursuenewanalyseswhichwouldsupporttwo-loopinjection.

Thenewanalysesweresubmitted inourlettersAEP:NRC:1024, datedMarch23,1987,andAEP:NRC:1024A, datedMay13,1987.Theanalysespresented intheseletterssupported closingofeithertheSIsystemcross-tie valvesortheRHRsystemcross-tie valves,butnotboth.Thenewanalysesinvolvedlarge-break LOCAevaluations fortheRHRcross-tie valves,andsmall-break LOCAevaluations fortheSIcross-tie valves.Indiscussions withyourstaffonJuly29,1987wewereinformedthatthestaffhadnoproblemswiththeRHR(large-break) analysesbuthadremaining questions ontheSI(small-break) analyses.

Adraftresponsetothestaff'squestions ontheSIevaluation hasbeenreceivedfromWestinghouse ElectricCorporation, andiscurrently underourreview.Thedraftindicates thatthesmallbreakLOCAanalyseswesubmitted inourlettersAEP:NRC:1024 andAEP:NRC:1024A remainvalid,andthattheSIcross-tie valvesshouldbeallowedtobeclosed.ReasonForReuestOnSeptember 11,1987,it.wasdetermined thatavalveintheUnit1RHRsystemwouldneedtoberepaired.

D.C.CookUnit1iscurrently returning tooperation following refueling.

Repairing thevalveinMode3(ratherthanMode4)willsaveapproximately 36hoursofcriticalpathtimebutwillrequiretheRHRcross-tie valvestobeclosed.Webelievetheanalyseswehavepreviously submitted supportthisoperation (provided theSIcross-tie valvesremainopen).Additionally wenotethatsinceD.C.CookUnit1isreturning fromarefueling outage,decayheatinthecoreisminimalwhichfurthersupportsourconclusion thattheRHRcross-tie valvescansafelybeclosed.Althoughwehavebeeninformally toldthatthestaffhasnoproblemswiththeRHRanalysis, thenewanalysishasneverbeenformallyapprovedbytheNRC.Forthisreason,we,arerequesting aone-timeinterpretation ofT/S3.5.2.esuchthatwemayoperatewiththeRHRcross-tie valvesclosedwhileinMode3incidenttotherequiredvalvemaintenance.

Pursuanttotherequirements of10CFR170.12(c),

wehaveenclosedanapplication feeof$150.00fortheproposedinterpretation.

Dr.T.E.Murley-3-AEP'NRC:1024B Thisdocumenthasbeenpreparedfollowing Corporate procedures whichincorporate areasonable setofcontrolstoinsureitsaccuracyandcompleteness priortosignature bytheundersigned.

Verytrulyyours,M.P.AlexichVicePresident cc:JohnE.DolanW.G.Smith,Jr.-BridgmanR.C.CallenG.Bruchmann G.CharnoffNRCResidentInspector

-BridgmanA.B.Davis-RegionIII