ML17255A386

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Ginna Plant Criticality Safety Analysis for New Fuel Storage Racks.
ML17255A386
Person / Time
Site: Ginna Constellation icon.png
Issue date: 07/31/1983
From: ROBBINS T R
PLG, INC. (FORMERLY PICKARD, LOWE & GARRICK, INC.)
To:
Shared Package
ML17255A385 List:
References
NUDOCS 8309160056
Download: ML17255A386 (17)


Text

forRochesterGasandElectricCorporation-GINNAPLANT-CriticalitySafetyAnalysisfortheNewFuelStorageRacksbyThomasR.RobbinsPickard,LoweandGarrick,Inc.July19838309ih00568309i2PDRADOCK05000244PPDR7011R0706835

IntroductionThenewfuelstorageracksfortheGinnaPlantaccommodate44fuelassembliesin4rowsof11assemblies.Althoughnewfuelassembliesarealwaysstoredinadryconditioninthese,racks,theconditionofoptimummoderationisconsideredinthisanalysiseventhoughitisinconceivablethatsuchaconditioncouldbeachievedintheseracks.'escritionoftheAnalsisAplanviewofthenewfuelstorageracksisshowninFigure1.AlthoughthecentertocenterspacingbetweenallfuelassemblystoragelocationsisnotuniformintheEast-NestDirection,aminimumuniformspacingwasconservativelyassumedintheanalysis.Figure1alsoshowstheconservativesymmetricgeometrymodelchosentocalculatetheeffectsofradialneutronleakagefromtheracksintheNorth-Southdirection.Symmetryboundaryconditions(i.e.,zeroneutroncurrent)areimposedontheNorth,East,andi<estboundariesofthemodel,andazeroneutronfluxboundaryconditionisimposedattheouteredgeoftheassumedwaterreflectorontheSouthboundary.ThedetaileddimensionsandgeometryofthismodelareshowninFigure2.The'uelassemblycharacteristicsutilizedfortheanalysisareshowninTable1.Auniform'axialenrichmentdistributionof4.25w/oU-235wasassumedforeachfuelrodintheassembly.ThekofthefuelpincellusedtogeneratecrosssectionsfortherackcriticalityanalysisisshownasafunctionofwaterdensityinFigure3.Forthenormaldrystoragecondition,thefuelassemblykwillbeessentiallythesameasorlowerthanthefuelpincellQ,andthereforeanupperlimitforthekffoftherackfordryconditionsmaybeobtainedbyextrapolationofthefuelpincellk:tozerowaterdensity.Theresultingkisabout0.72,andthekffofthefiniterackwillbesubstantiallylessthanthatvalue.7011R0706831 I'C Ifitisassumedtheentirerackareaissurroundedbyafulldensitywaterreflector,thenthewaterdensityintheresultingenclosedareacanbevaried,andthekoftherackcanbedeterminedfromeditswhichcombinethevoid-waterandfuelassemblyregionsofthemodelshowninFigure2.TheresultingfuelrackkisalsoshowninFigure3.Atwaterdensitiesbelow0;1gm/cc,'noptimummoderationconditionisapproached.Theapparent,optimummoderatordensityisquitelowbecauseofthelargevolumefractionofthevoid-waterregion(0.994)ascomparedtothatofthefuelregion(;006)."However,theselargek'satlowwaterdensitiesarenotofconcernasshownbythekffvaluesfromtheeffsamecalculations.Theneutronmultiplicationfactor,whichincludesneutronleakageeffectsintheNorth-Southdirectiononly,isshownasafunctionofwaterdensityinFigure4.Themaximumneutronmultiplicationfactorisseentobeabout0.94atanoptimumwaterdensityofabout:045gm/cc.'owever,thesecalculationsassumedzeroneutronleakageinboththeEast-Westradialdirectionandtheaxialdirection.Todeterminetheeffectof"axialneutronleakageonthemultiplicationfactor,fluxweightedcrosssectionsrepresentingthefuelassemblyandvoid-waterregionsoftheradialmodelwereusedinone-dimensionalaxialcalculations,andtheresultsarealsoshowninIFigure4.Themaximumneutronmultiplicationfactorisnowseentobeabout0.70atawaterdensityofabout.075gm/cc.ThislowmultiplicationfactorevenatoptimummoderationconditionsmakesitunnecessarytoevaluatetheneutronleakageeffectsintheEast-Westradialdirectionwhichwouldresultinsomefurthersmallbutsignificantreductionintheneutronmultiplicationfactor.Inadditiontotheotherconservatismsinthecalculations,nocreditwastakenforneutronstreamingeffectsatlowwaterdensities.Consideringthelargedistancesseparatingfuelassembliesintherack,sucheffectswouldbeexpectedtosignificantlyincreaseneutronleakagefromtheracksandtherebyfurtherreducetheneutronmultiplicationfactor.7011R0706832 I

Figure4alsodemonstratestheacceptabilityofthenewfuelstorageracksinthefloodedconditionwhichcorrespondstoawaterdensityof1.0gm/cc.Asshown,theneutronmultiplicationfactorissomewhatlessthan0;88forthefullyfloodedconditionandthereforeclearlyacceptable.Becauseoftheconservativetechniquesandassumptionsusedtoevaluatethemaximumpossibleneutronmultiplicationfactor,thereismorethanreasonableassurancethatnosignificanthazardsbasedoncriticalitysafetyareinvolvedinstoringfuelassembliesofupto4.25w/oU-235intheGinna.newfuelstorageracks.7011R0706833 Table1FUELASSEMBLYCHARACTERISTICSNumberofrodscontainingU02Rodpitch(in)Overallenvelopedimensions(in)WeightofU(KgU)Activefuellength(in)EnricheduraniumregionLength(in)Enrichment(w/o)NaturaluraniumblanketregionLength(in)Enrichment(w/o)InstrumenttubeMaterialO.D;(in)I.D.(in)Guidetubes1790."55607.763350;5141.4128.984.2512.420.711Zr-40.40150.3499MaterialO.D.(in),O.D.(in),I.D.(in),I.D.(in),FuelpelletMaterialDensity(XO.D.(in)CladdingO.D.(in)I.D.(in)SpacerGridsNumberabovedashpotindashpotabovedashpotindashpottheoretical)Zr-40.52800.48250.49000.4425U0295+"-1.50.34440.0019.400.3514i<eightsofmaterials*Inconelgrids(2),lbstotalZircaloygrids(7),lbstotal3.0019.46*Doesnotincludeweightofthestainlesssteelsleevesorinserts.7Allun7n~n~n a55c5g/-'8"/'-8"/'-8"/'-8"2.4"/'-8"/'8"2'O/'8-8"/-'8"/-'8"/'-8"Il.8TYP.IIt!fIINENIFUELRACKS(7YP.4R0M/5)SEEENLARGEOPLAAIA-8~5EEELEV.2&Oed.O.5180'ru).O32L2~2COhlTINVOJ58=7u<EFNd<sFORSUPPORTSTEELWTHISAREA-SEEOM/CI.D-522-G'32CONERVAFORRADIVENljLEADEL0GERACKFOROET4/2$OFOOOOSFE'/dl072

~~Figure2SYNNETRICHODELTOCONSERVATIVELYREPRESENTRADIALLEAKAGEOFTHEGINNANEMFUELSTORAGERACKS117.071.892107.064.108VOID-WATER7.784FUELASSEMBLIES7.784'MATER 4'tFigure3GINNANEWFUELRACKWITHOFAAT4.25W/0U-235INFINITEMULTIPLICATIONFACTORVSWATERDENSITY4>>>>444~~4+MtI>>t~1.6"'>>t<<tt+<<t~4~>>2>>%toot~M+22M~24~2224WtW4<<44~\4'~2-OOn2ttO4IOGL41.41.21.00.8O.o~222i":2'ar~it4~4<<EwZ4>>t~4+t424>>~t44~\>>W4C~ot~otQt>>4+~4<<~>>4+~4~>>WoI'4+2EEit.t2~+<<tl44Ott+2'>>~tl2'KIool~ttttitiI>>24Pi4~\rFIE~~tt~t4+Ztt4>>+4HHE~tt28Lttt4~+4+tootal~4=HT2H+tt~4<<44444++t+t4to~tlttt4>>:223K3144+224tto~444>>4>>tt>>+tt<<.24I+t4t444IP>>R~tlt>>1~+to44+\4442<<1Pi'.llIttt>>~>><<>>4NewFuelRackModel."=."~~;,FuelPinCell-:.0.442244ttttttttot4~4+4~4>>t>>~++4tg+~tt>>4~<<4Ittt44~444444>>4+>>4~tLI1~~to4+>>~tlt+4~~<<4ttt44>>>>44~ltoC~2"t~4444>>~t'I~KiIK-=-442-g30.2)4<<X+3~t~+4+t>>t~~o'.IIi22=~4>>4~~444444\4~4>>22I4+t4tttttottol44otto<<444~4>>t>>4~4~4~4~t>>t14Ž44+tot~~4~+440~~40>>4>>t~o~~0.4'.60.81.00.2WaterDensity(gm/cc)I~~II4~~I~~~ll>>~~I~>>4~oil Figure40.9i!!iii!!!li!!i!!I!Iij,'jGINNANEWFUELSTORAGERACKSWITHOFAAT4.25W/0U-235NEUTRONULTIPLICATiONFACTORVSWATERDENSITYiil!)jj'!!ll'i!iiiiji!'II!I~Ill!j!Il!))ljll!i)iillI'!i!ill!Ii)fill!lilitel!i)fl!!Ti!!l"ll)iiIlljlI!li):IQi'ili!:.i'I'll)'ll)i.!i!hl!i!jll!!!!i!!!!li:I!Il!'Ill:IWITHCONSERVATIVEHOOELOFRADIALLEAKAGEj))i....,,...,.~..!'!l!)il!)!illII'jjIIIIIIl!!'!!i!;I!!!j!)!I!)!OWITHCONSERVATIVEHODELOFRADIALANDAXIALLEAKAGE!l!Ijii!!1I"..Iiil'!!ii!i!!!ll!IIIjij!Ij!j!I'!j!),')jj)ijiEJ+0':!tii!iiit!!:ii!iii:jt;L'(I!!il!I!I!,Nj!Ii!iliai!l!!!i!j!i':i!i:!i!!':i)I!!j')I!!ii!!1)!)llOt0.6!'ii!!!!iiii:I)IIIjijL':tjj!:Ij.Ij!!!!)j)ii:il!lii!!ji!!iP)~':.:0.400.1ljl!)l(!i!!t(l"'i'I[0.20.30.40.50.60.20.80.91.0WaterDensity(gm/cc) ~~~CahKl' September2,1983DISTRIBUTIONDocketORBReadingGDickHSmithELDattorneyDOCKETNO(S).50-244Nr.JohnE.Mlier,VicePresidentElectricandSteamProductionRochester,.GasandElectricCorporation89EastAvenueRochester,NewYork14649IR.E.GINNAPLANT-OPPORTUNITYFORHEARING(APPLICATIONS1"1,/24/81,SNUBBERREQUIREMENTS:9/28/82,STAFFREORGANIZATION)Thefollowingdocumentsconcerningourreviewofthesubjectfacilityaretransmittedforyourinformation.'oticeofReceiptofApplication.Draft/FinalEnvironmentalStatement,datedNoticeofAvailabilityofDraft/FinalEnvironmentalStatement,datedSafetyEvaluationReport,orSupplementNo.,datedNoticeofHearingonApplicationforConstructionPermit.NoticeofConsiderationofIssuanceofFacilityOperatingLicense.ApplicationandSafetyAnalysisReport,VolumeAmendmentNo.toApplication/SARdatedConstructionPermitNo.CPPR-,AmendmentNo.,datedFacilityOperatingLicenseNo.,AmendmentNo.,datedOrderExtendingConstructionCompletionDate,datedElOther(Specify)CAugust23,1983(see48FR38421);theinterventionperiodexpiresDt

Enclosures:

Asstatedcc:w/enclosures:SeeSnextpage/gZ~/8Office,ofNuclearReacorRegulationDivision-of.'icensingOperatingReactorsBranch85AOFF/cE>L:0iF5SURNAME/g~COATEP/7NROFORM318{10/80)NRCM0240OFF(CIALRECOROCOPY

Mr.JohnE.MaierCC'arryH.Voigt,EsquireLeBoeuf,Lamb,LeibyandMacRae1333NewHampshireAvenue,N.W.Suite1100Washington,D.C.20036Mr.MichaelSlade12TrailwoodCircleRochester,NewYork14618EzraBialikAssistantAttorneyGeneralEnvironmentalProtectionBureauNewYorkStateDepartmentofLaw2WorldTradeCenterNewYork,NewYork10047ResidentInspectorR.E.GinnaPlantc/oU.S.NRC1503LakeRoadOntario,NewYork14519StanleyB.Klimberg,EsquireGeneralCounselNewYorkStateEnergy'fficeAgencyBui-lding2'mpireStatePlazaAlbany,NewYork12223Dr.EmmethA.LuebkeAtomicSafetyandLicensingBoardU.S.NuclearRegulatoryComnissionWashington,D.C.20555Dr.RichardF.ColeAtomicSafetyandLicensingBoardU.S.NuclearRegulatoryCoomissionWashington,D.C.20555Dr.ThomasE.Murley,RegionalAdministratorNuclearRegulatoryCoomission,RegionI631ParkAvenue'ingofPrussia,Pennsylvania19406U.S.EnvironmentalProtectionAgencyRegionIIOfficeATTN:RegionalRadiationRepresentative26FederalPlazaNewYork,NewYork10007HerbertGrossman,Esq.,ChairmanAtomic.SafetyandLicensingBoardU.S.NuclearRegulatoryCommissionWashington,D.C.20555SupervisoroftheTownofOntario107RidgeRoadWestOntario,NewYork14519JayDunklebergerNewYorkStateEnergyOffice.AgencyBuilding2EmpireStatePlazaAlbany,NewYork12223}}