ML17325A297

Informs of Intent to Change Design of Lower Tie Plate in Fuel Assemblies.Advanced Nuclear Fuels Corp Fuel Assemblies Will Be Installed During Cycle 7 Reload.Assemblies Incorporate debris-resistant Tie Plate.Fee Paid

ML17325A297
Person / Time
Site:	Cook
Issue date:	09/14/1987
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:1035, NUDOCS 8709210518
Download: ML17325A297 (8)

Text

'/eREQULAT'NFORMATION DISTRIBUTION STEM(RIDS)ACCESSION NOR:870'7210518

'OC.DATE:87/09/14NOTARIZED:NODOCKET0FAClL:,50-316 DonaldC.CookNuclearPowerPlantUnit2iIndianaZc05000316AUTH.NAMEAUTHORAFFILIATION ALEXICH>M.P.Indiana5MichiganElectricCo.RECIP.NAMERECIPIENT AFFILIATION MURLEY>T.E.NRC-NoDetailedAffiliation Given

SUBJECT:

Informsofutilintenttochangedesignoflowertieplateinfuelassemblies.

AdvancedNuclearFuelsCorpfuelassemblies willbeinstalled duringCycle2reload.Assemblies incorporate debris-resistant tieplate.DISTRIBUTION CODE:A001DCOPIEBRECEIVED:

LTRENCLSIZE:TITLE:ORSubmittal:

GeneralDistribution NOTES:RECIPIENTIDCODE/NAME PD3-3L*MIGGINGTONz DINTERNAL:

ARM/DAF/LFMB NRR/DEBT/CEB NRR/DEBT/RBB B/ILRBREQFILE01EXTERNAL'QM HRUSKEiSNRCPDRCOPIESLTTRENCL1011101111111111HAECIPIENTIDCODE/NAME PD3-3PDNRR/DEST/ADB NRR/DEBT/MTB NRR/DOEA/TSB OQC/HDS1REB/DE/EIH LPDRNBICCOPIESLTTRENCL551111011vlggg4I5$TOTALNUMBEROFCOPIESREQUIRED:

LTTR21ENCL18 II)'1I(+~%~'~v'~I'I't~q~~)~!F~J;NN INDIANA&MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS, OHIO43216September 14,1987AEP'NRC:1035 DonaldC.CookNuclearPlantUnit2DocketNo.50-316LicenseNo.DPR-74UNIT2CYCLE7RELOAD:CHANGESTOLOWERTIEPLATEDESIGNU.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555Attn:T.E.Murley

DearDr.Murley:

Thepurposeofthisletteristoinformyouofourintenttomakeachangetothedesignofthelowertieplateinthefuelassemblies whichwillbefabricated byAdvancedNuclearFuelsCorporation (ANF)fortheupcomingD.C.CookUnit2Cycle7reload.D.C.CookUnit2Cycle7isscheduled tobeginoperation inJune1989.Thereloadwillconsistof80assemblies suppliedbyANF.Theassemblies willincorporate adebris-resistant lowertieplateinthefuelassemblydesigntoprovideprotection fortheassemblies intheunlikelyeventthatdebrisispresentintheprimarycoolantsystem.Thenewlowertieplateisspecifically designedtoentrapdebrisofthesizewhichwouldbeexpectedtobecomeentrapped inthefuelassemblyspacers.Unit2Cycle7willbeprecededbyanextendedoutagetoreplaceallfoursteamgenerators.

Althoughextremecautionwillbeexercised duringthisoutagetopreventdebrisfromenteringtheprimarycoolantsystem,therevisedlowertieplatedesignisconsidered additional protection againstfueldamage.Asafetyreviewoftherevisedlowertieplatedesignhasbeenperformed byANFandisincludedasanattachment tothisletter.Thisreviewconcluded thatthereviseddesigndoesnotconstitute anunreviewed safetyquestionasdefinedin10CFR50.59.Thisconclusion wasbasedonpressuredropdataobtainedexperimentally byANF.Theseexperiments demonstrated thatthepressuredropfortherevisedlowertieplatedesignwaslessthan0.5%higherthanthepresentdesign.Thisdifference wasconsidered exceedingly smallandisboundedbytheassumptions ofthecurrentD.C.CookUnit2Cycle6safetyanalysesperformed byANF.po9~~>>88709ePDRADQCK05000316P",."".PDRJ

(,C1 Dr.T.E.Murley-2-AEP:NRC:1035 SincetheD.C.CookUnit:2Cycle7reloadwillbeverysimilartothepresentCycle6reload,thecurrentplansforCycle7aretoreviewthereloadinhouseundertheprovisions of10CFR50.59,ratherthanseekformalNRCreview.Sincethesafetyreviewoftherevisedlowertieplatedesignconcluded thattherearenounreviewed safetyquestions associated withthedesignchange,theplanstoreviewthereloadundertheprovisions of10CFR50.59areunaltered.

However,becausetheCycle7fuelwilldifferindesignfromthatpreviously reviewedbytheNRC,wehavedecidedasacourtesytoinformyouofthechangeandtosolicityourcomments.

Asstatedabove,the10CFR50.59safetyevaluation performed byANFisattachedtothisletter;inaddition, ANFhastransmitted toyou,viatheirletterDAA:014:87, datedAugust25,1987,acopyoftheirreportANF-87-91, "D.C.Cook2Debris-Resistant LowerTiePlatePressureDropTestReport."ANFisscheduled tobeginfabrication oftheCycle7reloadfuelbyOctober13,1987.Therefore, werequestthatyouinformusofanycommentsyouhaveonthenewlowertieplatedesignbySeptember 30,1987,sothatwedonotriskdisruption ofthefabrication schedule.

Pursuanttotherequirements of10CFR170.12(c),

wehaveenclosedanapplication feeof$150.00.Thisdocumenthasbeenpreparedfollowing Corporate procedures whichincorporate areasonable setofcontrolstoinsureitsaccuracyandcompleteness priortosignature bytheundersigned.

Verytrulyyours,M.P.AlichVicePresident cmAttachment cc:JohnE.DolanV.G.Smith,Jr.-BridgmanG.Bruchmann R.C.CallenG.CharnoffNRCResidentInspector

-BridgmanA.B.Davis-RegionIII Attachment toAEP:NRC:1035 AdvancedNuclearFuelsSafetyEvaluation ofRevisedLowerTiePlateDesign

.ADyANCED NUCLEARFUELSCQRPORATION

0!HORNRAPIDSROAD.POBOX130,RICHL4PID, WA993524130 is09i3rsei00TELEx

Ie2ereJuly30,1987ANF-AEP/0597 FUELENGINEERING 4TECHNICAL SERVICESIndiana5MichiganElectricCompanyc/oMr.ThomasGeorgantis

Engineer, NuclearMaterials 3FuelManagement AmericanElectricPowerServiceCorp.OneRiverside Plaza,20thFloorColumbus, OH43216-6631

Reference:

ANF-87-91(P),

"Debris-Resistant LowerTiePlatePressureDropTestReport,"AdvancedNuclearFuelsCorp.,July1987

DearHr.Georgantis:

AtAEP'srequest,AdvancedNuclearFuels(ANF)hasincorporated adebris-resistant lowertieplate(LTP)inthefuelassemblydesignasaprecaution againsttheunlikelyeventofdebrisbeingpresentintheprimarycoolantsystem.Thedebris-resistant LTPhasbeendesignedtoreducethepossibility ofdebrisenteringthefueledregionofthefuelassemblyfromtheprimarycoolantsystem.Specifically, itisdesignedtoentrapdebrisof*thesizewhichwouldbeexpectedtobecomeentrapped inthefuelassemblyspacers.Thisisanimprovement overthecurrentLTPdesigninthatitwillaidintheprevention offuelrodfailuresassociated withdebrisbecomingentrapped inthefuelassemblyspacersandproducing failuresduetofretting.

Further,entrapping debrisintheLTPinsteadofinaspacerwillprovidemoretimefortheflowtorecoverduetocrossflowaffectsbeforereachingtheHONBRregion,Areviewofthepressuredropinformation providedinReference (1)indicates thattheunchamfered debris-resistant LTPproposedforD.C.CookUnit2hasessentially thesamepressuredropasthecurrentLTP.Thatis,lessthana0.5%difference wasobservedinthetestdataobtainedbetweenthecurrentLTPandtheprcposedunchamfered debris-resistant LTP.Sincethisdifference isexceedingly small,itwillproduceonlyaveryminorinletflowperturbation.

Thisminorinletflowperturbation wouldbeexpectedtodisappear duetocrossfloweffectspriortoreachingtheaxiallocationatwhichHONBRwouldoccur.Further,thecurrentHONBRanalysisperformed for0,C.CookUnit2assumeda5%inletflowmaldistribution forthehotchannelwhichissignificantly largerthantheinletflowmaldistribution whichwouldbeexpectedfromtheLTPchange.Basedonthis,itisconcluded thattheCycle6safetyanalysiswillcovertheplantconditions expectedtooccurasaresultoftheLTPchange.Thus,AdvancedNuclearFuels(ANF)hasconcluded thattheresultspresented intheCycle6Disposition ofEventsandsafetyanalysisreportsarenotaffectedbythechangeinLTPandthatthesereportswillremainapplicable tofuture T.Georgantis (AEP)July30,1987ANF-AEP/0597 cycleswiththeunchamfered debris-resistant LTP.Consequently, ANFconcludes thatthesubstitution oftheunchamfered debris-resistant LTPforthecurrentD.C,CookUnit2LTP:(I)Doesnotinvolveasignificant increaseintheprobability ofoccurrence ortheconsequences ofanaccidentpreviously evaluated inthesafetyanalysisreports(2)Doesnotcreatethepossibility foranaccidentormalfunction ofadifferent typethananyevaluated previously inthesafetyanalysisreport.(3)Doesnotinvolveasignificant reduction inthemarginofsafetyasdefinedinthebasesforthetechnical specifications.

Therefore, ANFconcludes thatthesubstitution oftheunchamfered debris-resistant LTPforthecurrentLTPdoesnotinvolveanunreviewed safetyissueasdefinedin10CFR50.59.Noadditional analysesarerequiredinsupportofthisfinding.Ifyouhaveanyquestions orcommentsregarding theabove,pleasefeelfreetocontactus.cc:J.M.Cleveland DH.Malin~V.VanderBurg Sincerely,

.r.-..g'-wŽ'aryN.Ward,ManagerReloadLicensing