ML17334B051

Application for Amend to License DPR-58,revising Tech Specs to Increase Allowed Peak Pellet Exposure for Advanced Nuclear Fuel Corp Fuel.Nonproprietary & Proprietary Evaluations Encl.Proprietary Evaluation Withheld.Fee Paid

ML17334B051
Person / Time
Site:	Cook
Issue date:	02/20/1987
From:	ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17334B052	List: ML17334B051 ML17334B053
References
AEP:NRC:1018, NUDOCS 8703030045
Download: ML17334B051 (13)

Text

(;,REGULATORY

",ORMATIONDISTRIBUTIQNSYS(RIDB>ACCESSION NBR:8103030045 DQC.DATE:B7/02/20NOTARIZED:

NQ,DOCKETIFACIL/50-3f5 DonaldC.CookNuclearPouerPlant.Unitlindiana5050003kBAUTH(NAME AUTHORAFFILIATION ALEXICH,M.P.IndianaZcMichiganElectricCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentContv'olBvanch(Document ControlDesk)

SUBJECT:

Application fovamendtoLicensDPR-58krevisingTechSpecstoincv'ease allottedpeakpelletexposurefov'dvanc edNuclearFuelCorpfuel.Nonpvopv'ietav gZcproprietary evaluations encl.Propvietargevaluation withheld.

Feepaid.DISTRIBUTION CODE:A001DCOPIEBRECEIVED:

LTRIENCLjSIZE:1~36TITLE:QRSubmittal:

QenevalDistribution NOTES:RECIPIENTXDCODE/NAME PNR-AEBpNR-AFQBPNR-APD4PD~-7PklRMPBBINTERNAL:

ADM/LFMBNRR/QRAS50-Fit~~1COPIESLTTRENCL1155111010RECIPIENT IDCODE/MMEPNR-AEICS~S-<lPNR-APD4LANIQGINQTON>

DfQPNR-ARSB~t3NRR/DHFT/TBCB4 (QOQC/HDB1COPIESLTTRENCL2201111110EXTERNAL:

EQZcQBRUSKEaSNRCPDR02PPLPDRPpNSIC0305g'P1@pTOTALNUMBEROFCOPIESREQUIRED:

LTTR22ENCL18 h~~0V*Y~1'h4INDIANA8MICHIGANELECTRICCOMPANYP.O.BOX16631COLUMBUS, OHIO43216February20,1987AEPNRC1018DonaldC.CookNuclearPlantUnitNo.1DocketNo.50-315LicenseNo.DPR-58PROPOSEDTECHNICAL SPECIFICATION CHANGEREGARDING EXTENSION OFPEAKPELLETEXPOSUREFORADVANCEDNUCLEARFUELCORPORATION FUELU.S.NuclearRegulatory Commission Attn:DocumentControlDeskWashington, D.C.20555

DearSirs:

Thisletteranditsattachments constitute anapplication foramendment totheTechnical Specifications (T/Ss)fortheDonaldC.CookNuclearPlantUnitNo~1.Specifically, weproposetomodifyT/Ss3/4.2.2(HeatFluxHotChannelFactor-F(Z))and3/4.2.6(AxialPowerDistribution) toallowanincreaseintheallowedpeakpelletexposureforAdvancedNuclearFuelCorporation (ANF)(formerly ExxonNuclearCompany)fuelfromitspresentvalueof48.0MwD/kgto51'MwD/kg.OF)AQIOLI'Q0OOQIllr!6OOOAFLICOHOK>AIXI'.4Thereasonsfortheproposedchangesandouranalysisconcerning significant hazardsconsiderations arecontained inAttachment 1tothisletter.TheproposedrevisedT/Spagesarecontained inAttachment 2.Attachments 3and4containevaluations performed byANFinsupportofthechanges.Theseevaluations arediscussed inmoredetailinAttachment l.ECtPDIQ/a~ye:gpss~l(goaS-gf/CAderp~~(.D~l(Predictions offuelburnupmadepriortothebeginning ofthecurrentcycleindicated thattheANFfuelwouldnotexceedthecurrentpeakpelletexposurelimitof48.0MwD/kg.However,recentfluxmapshaveindicated thepotential fortheANFfueltoslightlyexceedthelimitpriortodischarge attheendofcycle.According toourfluxmaps,thelimitmaybeexceededasearlyasMay3,1987,approximately threeweekspriortothestartoftheupcomingUnit1refueling outage,currently scheduled tobeginonMay24,1987.Becausethissituation createsthepotential forarequiredearlyshutdownoftheunit,werequestanexpedited reviewoftheproposedchangesandaresponsebyApril30,1987.Wearecurrently preparing proposedsimplifications totheD.C.CookUnit1powerdistribution monitoring T/Ss.Tneseproposedchanges,whichareintendedtoprovideconsistency betweentheD.C.CookUnits1and2T/Ss,willmostlikelyproposedeletionoftheburnuprequirements fromtheT/Ss.However,becausewewillreachourpeakpelletexposurelimitinearlyMay1987,wehavedecidedtosubmitthepeakpelletexposureextension requestseparately toallowadequatetimeforNRCreview.

~2~AEP:NRG:101& SinceAttachment 4containsANFproprietary information, wehaveincludedanaffidavit tothateffectwithit.Attachment 5containsanon-proprietary versionoftheANFdocumentinAttachment 4.TheANFanalyseswehaveattachedprovidejustification foranextension oftheallowedpeakpelletexposurefortheirfuelto48.7Mwd/kg,ratherthanthe51.0Mwd/kgwehaveproposedinthissubmittal.

AsdetailedinAttachment 1,itisourunderstanding thattheadditional analysesnecessary tosupportthevalueof51.0Mwd/kgcanbereviewedbyusundertheprovisions of10CFR50.59andtherefore willnotrequireanadditional submittal.

Thevalueof48.7Mwd/kgshouldbesufficient toallowoperation tocontinueuntilthestartoftheUnit1refueling outage,currently scheduled forMay24,1987.Atthistime,however,weareinvestigating thepossibility ofdelayingtheoutagestartdateduetovarioussystemconcerns, suchasoutagesinotherofouroperating units.Forthisreason,weareconsidering havinganalysesperformed tojustifypeakpelletexposurelimitsforANFfuelgreaterthan48.7Mwd/kg.ANFhasinformedusthattheseanalysesmaybeextensive andinvolveseveralweekspreparation timeInordertoallowadequatetimeforNRCreviewofourproposedchangesandforourownevaluation ofourpeakpelletexposureneeds,wehavechosentosubmitanalysessupporting peakpelletexposures of48.7Mwd/kgandtopursueexposures beyondthisvalueviathe10CFR50.59process.Thisapproachwasdiscussed withtheNRCstaffonFebruary12,1987.Sinceatthepresenttimewecanonlyjustifyavalueof48.7Mwd/kg,wewouldimplement administration controlstoprohibitoperation abovepeakpelletexposures forANFfuelof48.7Mwd/kgwithoutappropriate analysesand10CFR50.59review.Webelievethattheproposedchangeswillnotresultin(1)asignificant changeinthetypesofeffluents orasignif4.cant increaseintheamountsofanyeffluents thatmaybereleasedoffsite,or(2)asignificant increaseinindividual orcumulative occupational radiation exposure.

TheseproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommittee (PNSRC),andwillbereviewedbytheNuclearSafetyandDesignReviewCommittee (NSDRC)attheirnextregularly scheduled meeting.Incompliance withtherequirements of10CFR50.91(b)(l),

copiesofthisletteranditsattachments havebeentransmitted toMr.R.C.CallenoftheMichiganPublicServiceCommission andMr.G.Bruchmann oftheMichiganDepartment ofPublicHealth.Pursuantto10CFR170.12(c),

wehaveenclosedanapplication feeof$150.00fortheproposedamendment.

AEPNRC'1018-3-Thisdocumenthasbeenpreparedfollowing Corporate procedures whichincorporate areasonable setofcontrolstoinsureitsaccuracyandcompleteness priortosignature bytheundersigned.

M.P.AlezichVicePresident Attachments cc:JohnE.DolanW.G.Smith,Jr.-BridgmanG.Bruchmann R.C.CallenG.CharnoffNRCResidentInspector

-BridgmanJ.G.Keppler-RegionIII

~~Attachment 1toAEP:NRC:1018 Reasonsand10CFR50.92AnalysesforChangestotheDonaldC.CookNuclearPlantUnitNo.1Technical Specifications

VAttaohment

'1toAEP:N:1018 I,Page1BBackBoundThisletterproposestoincreasetheallowable peakpelletexposureforANFfuelfromitspresentvalueof48.0Mwd/kgtoahighervalueof51.0Mwd/kg.PeakpelletexposureisingenerallimitedbyeitherLOCAanalysisconsiderations orfuelmechanical designcharacteristics.

ForANFfuelinUnit1,thevaluehasbeenincludedintheT/Ssspecifically becauseofLOCAanalysisconsiderations, whicharediscussed inmoredetailbelo~.Thelimitof48.0Mwd/kgappearsinthegraphsofexposure-dependent Flimit(F(Eg,))andnormalized Flimit(T(E0,))foundinFigure3.2-4oftheLUnit1T/Ss(page3/42-23).ItalsoappearsintheFuncertainty factorsE(Z)(page3/42-7)andF(page3/42-20).PPDuringthedesignphaseofafuelcycle,predictions ofpeakpelletexposurearemade,andthesepredicted exposures areensuredtobewithinapplicable limits(mechanical andLOCA,aswellasT/Swhereapplicable).

ForANFassemblies inD.C.CookUnit1,wemonitorburnupviafluxmappingtoensureadherence toT/Slimits.Recentfluxmappinghasdemonstrated thatthepotential existsforseveralANFfuelassemblies toslightlyexceed.their48.0Mwd/kgT/SlimitbyMay3,1987,approximately threeweekspriortothescheduled startoftheupcomingUnit1outage,whichiscurrently scheduled tobeginonMay24,1987.Currently, allnewfuelforD.C.CookUnit1isbeingsuppliedbyWestinghouse ElectricCorporation (Westinghouse).

Thepresentcycle(Cycle9)usesonly34ANFassemblies.

Ofthese34assemblies, only4areexpectedtoexceedthecurrentpeakpelletexposurelimitof48.0Mwd/kg.ByMay24,1987noneshouldhaveexceededthelimitbymorethan0.7Mwd/kg,whichrepresents anexcessoflessthan2%.CurrentdesignplansfortheCycle10coredonotcallforanyoftheANFassemblies tobereused,althoughtheseplansaresubjecttochangeshouldweencounter unanticipated fuelfailu"esordamagedassemblies duringrefueling.

ANFhasevaluated thesafetyimpactofoperation upto51.0Mwd/kgforLOCAconsiderations (Attachment 3),butonlyto48.7Mwd/kgformechanical design VAttachment 1toAEP:;1018considerations (Attachment 4).Themechanical designevaluation waslimitedto48.7Mwd/kgbecausethisvaluecouldbesupported inlargepartbyextrapolations fromexistinganalyses.

ANFhasinformedusthatanalysestosupporthighervaluesofpeakpelletexposuremaybeextensive andinvolveseveralweekspreparation time.Thus,wewereunabletohavetheseanalysesperformed intimetoaccompany thisletterandstillallowadequatetimeforNRCreview.Additionally, asdiscussed inthecoverletter,weareunsureatthistimewhetherpeakpelletexposures beyond48.7Mwd/kgareevennecessary.

Wearetherefore unsurewhetherwewanttoundertake theexpenseandefforttohavetheanalysesperformed.

ANFhasinformedusthatinmeetingswiththeNRCstaffheldinAugust1986,thestaffexplained thatfuelmechanical designanalysescouldbereviewedundertheprovisions of10CFR50.59withoutNRCreviewprovidedthatANFfollowedthemethodology outlinedintheirdocumentXN-NF-82-06, Rev.1,"Qualification ofExxonNuclearFuelforExtendedBurnup",andifthebatchaverageisbelowtheapprovedhighburnuplevelinthisdocument.

Shouldwedecidetopursuepeakpelletexposures beyond48.7Mwd/kg,whichequatestobatchaverageburnupconsiderably lessthanbatchaverageburnupsapprovedinXN-NF-82-06 Rev.1,weproposetohaveANFdosousingthepartsofXN-NF-82-06 Rev.1whichareapplicable topeakpelletexposure, andtoreviewtheseanalysesundertheprovisions of10CFR50.59.(Sincepeakrodandpeakassemblyexposures arenotbeingchangedbeyondthataddressed inthecurrently approvedmechanical designsafetyevaluation, XN-NF-84-25, notallaspectsoftheXN-NF-82-06 Rev.1methodology needtobeaddressed.)

DescitiooProosedChanesTheANFevaluations presented inAttachments 3and4providesupportforapeakpelletexposurelimitof51.0Mwd/kgbasedonLOCAconsiderations, butonly48.7Mwd/kgbasedonmechanical designconsiderations.

Theseanalysesallowtheexposure-dependent peakingfactorlimit,F(ER)ofT/SFigureLQ3.2-4(p.3/43-23)toremainat1.82(itspresentvalueat48.0Mwd/kgpeakpelletexposure).

WehaveredrawnT/SFigure3.2-4toshowthecurveextending toanF(Ei)valueof1.82at51.0Mwd/kg.T(ER),theLL,normalized F'(Eg,),whichisalsocontained inT/SFigure3.2-4,hasbeen Attachment.

1toAEP:.:1018similarly redrawn.WehavealsomodifiedthevaluesofE(Z)inT/S4.2.2.2P(p.3/42-7)andFinT/S3.2.6.g.(p.3/42-20)todefinethesefactorsasP1.0from48.0to51.0Mwd/kgpeakpelletexposure.

E(Z)isanuncertainty Pfactortoaccountforareduction intheF(Ei)curveduetoanaccumulation ofexposurebetweenfluxmaps'hequantityFisasimilarPfactorforusewiththeAxialPowerDistribution Monitoring System(APDMS).ThevaluesofthesefactorsarerelatedtotheslopeoftheF(Ea)curveLLQfromT/SFigure3.2-4.AflatslopefortheF(Eg)curve,aswehaveproposedbetween48.0and51.0Mwd/kg,resultsinnochangeintheallowable LvalueofF(Eg,)betweenfluxmapsandthusnopenalty(penaltyfactorof1.0).Thisisconsistent withthevalueof1.0assignedtothesefactorsbetweenpeakpelletexposures of0'and17.62Mwd/kgwheretheslopeofFLQ(Eg)isalsoflat.Sinceatthepresenttimewecanonlyjustifyapeakpelletexposureof48.7Mwd/kg,wewouldimplement administrative controlstoprohibitoperation beyond48.7Mwd/kgwithoutananalysiswhichusesthemethodology fromtheappropriate sectionsofXN-NF-82-06 Rev.1andasubsequent reviewoftheseanalysesunder10CFR50.59.Justificati,on forProosedChanesThefollowing justifications addressLOCAconsiderations upto51.0Mwd/kgandmechanical designconsiderations upto48.7Mwd/kg.Asdiscussed previously, weproposethatanyadditional mechanical designanalyseswhichmaybeperformed insupportofhigherpeakpelletburnupswillbeperformed usingtheapprovedmethodology ofZN-NF-82-06 Rev.1andwillbereviewedundertheprovisions of10CFR50.59.1.LOCAConsiderations FdoesnotvaryasafunctionofburnupforWestinghouse fuelineithertheD.C.CookUnits1or2T/Ss.ForANFfuel,itvariesasafunctionofburnuponlyintheUnit1T/Ss.Thereasontheburnupdependence isincludedforANFfuelinUnit1isthatthelimitswerebasedonANFLOCAanalysesdatingbacktothemid-1970s, whichusedaburnup-dependent F.MoredetailedandmodernANFLOCAanalysesdonotrequireF'obeburnup-dependent.

Forexample,FforANFfuelinQ Attachment 1toAEP:NRC:1018 Page4D.,C.CookUnit2isaconstantat-2.10,withnoexposuredependence

.orlimitsfoundintheT/Ss.ThenewerANFanalyseshavedetermined thelimitingexposures withregardtopeakcladtemperature concernstobeatrelatively lowexposures (lessthan10Mwd/kg).Similarly, Westinghouse LOCAmodelsassumeaconstantvalueforFthroughout thecycle.ANFhasrecentlyperformed anewlimitingbreakK(Z)LOCA/ECCS analysisforUnit1.Thisanalysis, whichiscontained inXN-NF'-85-115 Rev.2,wassenttoyoudirectlybyANFintheirletterGNW:001:87, datedJanuary15,1987(asnotedinourletterAEP:NRC:0940E, datedJanuary29,1987).ThisanalysisusedthemodernANFevaluation methodsincluding theFuelCoolingTestFacility(FCTF)refloodheattransfercorrelations.

Thedocumentdiscusses analysesperformed forpeakpelletexposures of2Mwd/kgand9Mwd/kg,whichANFhasdetermined tobeboundingwithregardtopeakcladtemperature.

TheseanalysesassumedanFvalueof2.04peakedatthecoremidplaneat2~Mwd/kgand1.95peakedatthecoretopat9Mwd/kg.Bothofthesevaluesareconservative withrespecttothevalueof1.82requiredbyUnit1T/SFigure3.2-4at48Mwd/kg.Asdiscussed inAttachment 3,ANFhasinformedusthattheanalysestheyperformed forXN-NF-85-115 Rev.2areapplicable uptoapeakrodaverageexposureof47Mwd/kg,whichcorresponds toapeakpelletexposureof51Mwd/kg.Thisisbasedoncomparisons ofexposureanalysesANFperformed fortheirfuelinD.C.CookUnit2andSt.LucieUnit1.Theanalysesforbothoftheseunitsdemonstrated maximumvaluesofpeakcladtemperature occurring intheverylowexposurerange.ForD.C.CookUnit2,thepeaktemperature occurredatanexposureofonly2Mwd/kg.SincealltheANFassemblies haveundergone significant burnup,wedidnotneedanFvalueashighasQthatsupported bytheANFanalysesandhavethusconservatively proposedtomaintainFatavalueof1.82,whichcorresponds toitspresentlimitat48.0Mwd/kg.

'aAttachment 1toAEP::10182.Mechanical DesignConsiderations Theanalysissupporting thecurrentpeakpelletexposureof48.0Mwd/kgiscontained inANFreportXN-NF-84-25 (P),entitled"Mechanical DesignReportSupplement forD.C.CookUnit1ExtendedBurnupFuelAssemblies."

Thisdocumentwassubmitted directlytoyoubyANFwiththeirletterJCC:113:84, datedAugust21,1984.Itwasreferenced byusinourletterAEP:NRC:0745M, datedAugust23,1984,whichproposedtoincreasepeakpelletexposureforANFfuelinD.C.CookUnit1from42.2Mwd/kgtoitspresentvalueof48.0Mwd/kg.ThechangeswereapprovedbytheNRCviaAmendment 82totheD.C.CookUnit1T/Ss,whichisdatedNovember29,1984.Attachment 4tothislettercontainsanevaluation byANFtosupportextending thepeakpelletburnupto48.7Mwd/kg.Thisevaluation demonstrates thatapplicable ANFmechanical designcriteriawouldbesatisfied withapeakpelletexposurelimitof48.7Mwd/kg.Ofthesecriteria, whicharediscussed inAttachment 4,ANFhasdetermined thatallcriteriaexceptsteady-state strain,corrosion, hydrogenabsorption, andfuelrodinternalpressureareessentially independent ofthepeakpelletexposurelimit.Forsteady-state strain,corrosion, andhydrogenabsorption, ANFperformed extrapolations oftheiranalysesreportedinXN-NF-84-25 (P).Theresultsoftheseextrapolations, reportedinAttachment 4,demonstrate significant margintotheANFdesignlimits.Forfuelrodinternalpressure, ANFperformed anewanalysisusingtheirRODEX2code.Thepeakingfactorwasincreased by2%atthemaximumaxialregionfromthatusedfortheXN-NF-84-25 analysistoboundtheincreased peakpelletburnup.Theresultsofthisanalysisdemonstrated apeakinternalpressurewellbelowtheANFdesigncriterialimitof2250psiaspecified inXN-NF-84-25.

Attachm'ent 1toAEP:NRC:1018 Page6SificantaardsConsideationsPer10CFR50.92,aproposedamendment willnotinvolveasignificant hazardsconsideration iftheproposedamendment doesnot:(1)involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated, (2)createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated; or(3)involveasignificant reduction inamarginofsafety.CiterionWehavepresented analyseswhichdemonstrate thatoperation upto48.7Mwd/kgpeakpelletexposurewillnotviolateanyapplicable safetylimitsor'designcriteria.

Inaddition, wewouldimplement administrative controlstoprohibitoperation beyond48.7Mwd/kgunlessanalysesareperformed usingmethodology thatisknowntobeacceptable totheNRC.Therefore, weconcludethattheproposedchangeswillnotsignificantly increasetheprobability ofoccurrence orconsequences ofapreviously evaluated

accident, norwilltheyinvolveasignificant reduction inamarginofsafety.Criterion LOCAanalysesandfuelmechanical designlimitsaretheprincipal areasofconcernregarding peakpelletexposures Wehavepresented evaluations whichconcludethatapplicable criteriawithregardtotheseissueswillcontinuetobemetforexposures upto48.7Mwd/kg,andhavecommitted tonotexceedthatlimitwithoutanalyseswhichusemethodologies acceptable totheNRC.Thus,weconcludethattheproposedchangeswillnotcreatethepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously analyzedorevaluated.

Attachment 1toAEP:C:1018Page7Criterion 3SeeCriterion 1,above'astly, wenotethattheCommission hasprovidedguidanceconcerning thedetermination ofsignificant hazardsbyproviding certainexamples(48FR14870)ofamendments considered notlikelytoinvolvesignificant hazardsconsideration.

Thesixthoftheseexamplesreferstochangeswhichmayresultinsomeincreasetotheprobability ofoccurrence orconsequences ofapreviously analyzedaccidentormayreduceinsomewayasafetymargin,buttheresultsofwhichareclearlywithinlimitsestablished asacceptable.

Becausetheseproposedchangesinvolveextension ofalimitcontained intheT/Ss,theymaybeperceived asinvolving areduction insafetymargin;however,forreasonspreviously presented, wedonotbelievethatanyreductions wouldbesignificant.