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'NFORMATIONDISTRIBUTIONSTEM(RIDS)ACCESSIONNOR:870'7210518'OC.DATE:87/09/14NOTARIZED:NODOCKET0FAClL:,50-316DonaldC.CookNuclearPowerPlantUnit2iIndianaZc05000316AUTH.NAMEAUTHORAFFILIATIONALEXICH>M.P.Indiana5MichiganElectricCo.RECIP.NAMERECIPIENTAFFILIATIONMURLEY>T.E.NRC-NoDetailedAffiliationGiven

SUBJECT:

Informsofutilintenttochangedesignoflowertieplateinfuelassemblies.AdvancedNuclearFuelsCorpfuelassemblieswillbeinstalledduringCycle2reload.Assembliesincorporatedebris-resistanttieplate.DISTRIBUTIONCODE:A001DCOPIEBRECEIVED:LTRENCLSIZE:TITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-3L*MIGGINGTONzDINTERNAL:ARM/DAF/LFMBNRR/DEBT/CEBNRR/DEBT/RBBB/ILRBREQFILE01EXTERNAL'QMHRUSKEiSNRCPDRCOPIESLTTRENCL1011101111111111HAECIPIENTIDCODE/NAMEPD3-3PDNRR/DEST/ADBNRR/DEBT/MTBNRR/DOEA/TSBOQC/HDS1REB/DE/EIHLPDRNBICCOPIESLTTRENCL551111011vlggg4I5$TOTALNUMBEROFCOPIESREQUIRED:LTTR21ENCL18 II)'1I(+~%~'~v'~I'I't~q~~)~!F~J;NN INDIANA&MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS,OHIO43216September14,1987AEP'NRC:1035DonaldC.CookNuclearPlantUnit2DocketNo.50-316LicenseNo.DPR-74UNIT2CYCLE7RELOAD:CHANGESTOLOWERTIEPLATEDESIGNU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.E.Murley

DearDr.Murley:

ThepurposeofthisletteristoinformyouofourintenttomakeachangetothedesignofthelowertieplateinthefuelassemblieswhichwillbefabricatedbyAdvancedNuclearFuelsCorporation(ANF)fortheupcomingD.C.CookUnit2Cycle7reload.D.C.CookUnit2Cycle7isscheduledtobeginoperationinJune1989.Thereloadwillconsistof80assembliessuppliedbyANF.Theassemblieswillincorporateadebris-resistantlowertieplateinthefuelassemblydesigntoprovideprotectionfortheassembliesintheunlikelyeventthatdebrisispresentintheprimarycoolantsystem.Thenewlowertieplateisspecificallydesignedtoentrapdebrisofthesizewhichwouldbeexpectedtobecomeentrappedinthefuelassemblyspacers.Unit2Cycle7willbeprecededbyanextendedoutagetoreplaceallfoursteamgenerators.Althoughextremecautionwillbeexercisedduringthisoutagetopreventdebrisfromenteringtheprimarycoolantsystem,therevisedlowertieplatedesignisconsideredadditionalprotectionagainstfueldamage.AsafetyreviewoftherevisedlowertieplatedesignhasbeenperformedbyANFandisincludedasanattachmenttothisletter.Thisreviewconcludedthatthereviseddesigndoesnotconstituteanunreviewedsafetyquestionasdefinedin10CFR50.59.ThisconclusionwasbasedonpressuredropdataobtainedexperimentallybyANF.Theseexperimentsdemonstratedthatthepressuredropfortherevisedlowertieplatedesignwaslessthan0.5%higherthanthepresentdesign.ThisdifferencewasconsideredexceedinglysmallandisboundedbytheassumptionsofthecurrentD.C.CookUnit2Cycle6safetyanalysesperformedbyANF.po9~~>>88709ePDRADQCK05000316P",."".PDRJ

(,C1 Dr.T.E.Murley-2-AEP:NRC:1035SincetheD.C.CookUnit:2Cycle7reloadwillbeverysimilartothepresentCycle6reload,thecurrentplansforCycle7aretoreviewthereloadinhouseundertheprovisionsof10CFR50.59,ratherthanseekformalNRCreview.Sincethesafetyreviewoftherevisedlowertieplatedesignconcludedthattherearenounreviewedsafetyquestionsassociatedwiththedesignchange,theplanstoreviewthereloadundertheprovisionsof10CFR50.59areunaltered.However,becausetheCycle7fuelwilldifferindesignfromthatpreviouslyreviewedbytheNRC,wehavedecidedasacourtesytoinformyouofthechangeandtosolicityourcomments.Asstatedabove,the10CFR50.59safetyevaluationperformedbyANFisattachedtothisletter;inaddition,ANFhastransmittedtoyou,viatheirletterDAA:014:87,datedAugust25,1987,acopyoftheirreportANF-87-91,"D.C.Cook2Debris-ResistantLowerTiePlatePressureDropTestReport."ANFisscheduledtobeginfabricationoftheCycle7reloadfuelbyOctober13,1987.Therefore,werequestthatyouinformusofanycommentsyouhaveonthenewlowertieplatedesignbySeptember30,1987,sothatwedonotriskdisruptionofthefabricationschedule.Pursuanttotherequirementsof10CFR170.12(c),wehaveenclosedanapplicationfeeof$150.00.ThisdocumenthasbeenpreparedfollowingCorporateprocedureswhichincorporateareasonablesetofcontrolstoinsureitsaccuracyandcompletenesspriortosignaturebytheundersigned.Verytrulyyours,M.P.AlichVicePresidentcmAttachmentcc:JohnE.DolanV.G.Smith,Jr.-BridgmanG.BruchmannR.C.CallenG.CharnoffNRCResidentInspector-BridgmanA.B.Davis-RegionIII AttachmenttoAEP:NRC:1035AdvancedNuclearFuelsSafetyEvaluationofRevisedLowerTiePlateDesign

.ADyANCEDNUCLEARFUELSCQRPORATION;0!HORNRAPIDSROAD.POBOX130,RICHL4PID,WA993524130is09i3rsei00TELEx:Ie2ereJuly30,1987ANF-AEP/0597FUELENGINEERING4TECHNICALSERVICESIndiana5MichiganElectricCompanyc/oMr.ThomasGeorgantisEngineer,NuclearMaterials3FuelManagementAmericanElectricPowerServiceCorp.OneRiversidePlaza,20thFloorColumbus,OH43216-6631

Reference:

ANF-87-91(P),"Debris-ResistantLowerTiePlatePressureDropTestReport,"AdvancedNuclearFuelsCorp.,July1987

DearHr.Georgantis:

AtAEP'srequest,AdvancedNuclearFuels(ANF)hasincorporatedadebris-resistantlowertieplate(LTP)inthefuelassemblydesignasaprecautionagainsttheunlikelyeventofdebrisbeingpresentintheprimarycoolantsystem.Thedebris-resistantLTPhasbeendesignedtoreducethepossibilityofdebrisenteringthefueledregionofthefuelassemblyfromtheprimarycoolantsystem.Specifically,itisdesignedtoentrapdebrisof*thesizewhichwouldbeexpectedtobecomeentrappedinthefuelassemblyspacers.ThisisanimprovementoverthecurrentLTPdesigninthatitwillaidinthepreventionoffuelrodfailuresassociatedwithdebrisbecomingentrappedinthefuelassemblyspacersandproducingfailuresduetofretting.Further,entrappingdebrisintheLTPinsteadofinaspacerwillprovidemoretimefortheflowtorecoverduetocrossflowaffectsbeforereachingtheHONBRregion,AreviewofthepressuredropinformationprovidedinReference(1)indicatesthattheunchamfereddebris-resistantLTPproposedforD.C.CookUnit2hasessentiallythesamepressuredropasthecurrentLTP.Thatis,lessthana0.5%differencewasobservedinthetestdataobtainedbetweenthecurrentLTPandtheprcposedunchamfereddebris-resistantLTP.Sincethisdifferenceisexceedinglysmall,itwillproduceonlyaveryminorinletflowperturbation.ThisminorinletflowperturbationwouldbeexpectedtodisappearduetocrossfloweffectspriortoreachingtheaxiallocationatwhichHONBRwouldoccur.Further,thecurrentHONBRanalysisperformedfor0,C.CookUnit2assumeda5%inletflowmaldistributionforthehotchannelwhichissignificantlylargerthantheinletflowmaldistributionwhichwouldbeexpectedfromtheLTPchange.Basedonthis,itisconcludedthattheCycle6safetyanalysiswillcovertheplantconditionsexpectedtooccurasaresultoftheLTPchange.Thus,AdvancedNuclearFuels(ANF)hasconcludedthattheresultspresentedintheCycle6DispositionofEventsandsafetyanalysisreportsarenotaffectedbythechangeinLTPandthatthesereportswillremainapplicabletofuture T.Georgantis(AEP)July30,1987ANF-AEP/0597cycleswiththeunchamfereddebris-resistantLTP.Consequently,ANFconcludesthatthesubstitutionoftheunchamfereddebris-resistantLTPforthecurrentD.C,CookUnit2LTP:(I)Doesnotinvolveasignificantincreaseintheprobabilityofoccurrenceortheconsequencesofanaccidentpreviouslyevaluatedinthesafetyanalysisreports(2)Doesnotcreatethepossibilityforanaccidentormalfunctionofadifferenttypethananyevaluatedpreviouslyinthesafetyanalysisreport.(3)Doesnotinvolveasignificantreductioninthemarginofsafetyasdefinedinthebasesforthetechnicalspecifications.Therefore,ANFconcludesthatthesubstitutionoftheunchamfereddebris-resistantLTPforthecurrentLTPdoesnotinvolveanunreviewedsafetyissueasdefinedin10CFR50.59.Noadditionalanalysesarerequiredinsupportofthisfinding.Ifyouhaveanyquestionsorcommentsregardingtheabove,pleasefeelfreetocontactus.cc:J.M.ClevelandDH.Malin~V.VanderBurgSincerely,.r.-..g'-wŽ'aryN.Ward,ManagerReloadLicensing