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

forRochester GasandElectricCorporation

-GINNAPLANT-Criticality SafetyAnalysisfortheNewFuelStorageRacksbyThomasR.RobbinsPickard,LoweandGarrick,Inc.July19838309ih0056 8309i2PDRADOCK05000244PPDR7011R0706835

Introduction ThenewfuelstorageracksfortheGinnaPlantaccommodate 44fuelassemblies in4rowsof11assemblies.

Althoughnewfuelassemblies arealwaysstoredinadrycondition inthese,racks,thecondition ofoptimummoderation isconsidered inthisanalysiseventhoughitisinconceivable thatsuchacondition couldbeachievedintheseracks.'escri tionoftheAnalsisAplanviewofthenewfuelstorageracksisshowninFigure1.Althoughthecentertocenterspacingbetweenallfuelassemblystoragelocations isnotuniformintheEast-Nest Direction, aminimumuniformspacingwasconservatively assumedintheanalysis.

Figure1alsoshowstheconservative symmetric geometrymodelchosentocalculate theeffectsofradialneutronleakagefromtheracksintheNorth-South direction.

Symmetryboundaryconditions (i.e.,zeroneutroncurrent)areimposedontheNorth,East,andi<estboundaries ofthemodel,andazeroneutronfluxboundarycondition isimposedattheouteredgeoftheassumedwaterreflector ontheSouthboundary.

Thedetaileddimensions andgeometryofthismodelareshowninFigure2.The'uelassemblycharacteristics utilizedfortheanalysisareshowninTable1.Auniform'axialenrichment distribution of4.25w/oU-235wasassumedforeachfuelrodintheassembly.

Thekofthefuelpincellusedtogeneratecrosssectionsfortherackcriticality analysisisshownasafunctionofwaterdensityinFigure3.Forthenormaldrystoragecondition, thefuelassemblykwillbeessentially thesameasorlowerthanthefuelpincellQ,andtherefore anupperlimitforthekffoftherackfordryconditions maybeobtainedbyextrapolation ofthefuelpincellk:tozerowaterdensity.Theresulting kisabout0.72,andthekffofthefiniterackwillbesubstantially lessthanthatvalue.7011R0706831 I'C Ifitisassumedtheentirerackareaissurrounded byafulldensitywaterreflector, thenthewaterdensityintheresulting enclosedareacanbevaried,andthekoftherackcanbedetermined fromeditswhichcombinethevoid-water andfuelassemblyregionsofthemodelshowninFigure2.Theresulting fuelrackkisalsoshowninFigure3.Atwaterdensities below0;1gm/cc,'noptimummoderation condition isapproached.

Theapparent, optimummoderator densityisquitelowbecauseofthelargevolumefractionofthevoid-water region(0.994)ascomparedtothatofthefuelregion(;006)."However,theselargek'satlowwaterdensities arenotofconcernasshownbythekffvaluesfromtheeffsamecalculations.

Theneutronmultiplication factor,whichincludesneutronleakageeffectsintheNorth-South direction only,isshownasafunctionofwaterdensityinFigure4.Themaximumneutronmultiplication factorisseentobeabout0.94atanoptimumwaterdensityofabout:045gm/cc.'owever, thesecalculations assumedzeroneutronleakageinboththeEast-West radialdirection andtheaxialdirection.

Todetermine theeffectof"axialneutronleakageonthemultiplication factor,fluxweightedcrosssectionsrepresenting thefuelassemblyandvoid-water regionsoftheradialmodelwereusedinone-dimensional axialcalculations, andtheresultsarealsoshowninIFigure4.Themaximumneutronmultiplication factorisnowseentobeabout0.70atawaterdensityofabout.075gm/cc.Thislowmultiplication factorevenatoptimummoderation conditions makesitunnecessary toevaluatetheneutronleakageeffectsintheEast-West radialdirection whichwouldresultinsomefurthersmallbutsignificant reduction intheneutronmultiplication factor.Inadditiontotheotherconservatisms inthecalculations, nocreditwastakenforneutronstreaming effectsatlowwaterdensities.

Considering thelargedistances separating fuelassemblies intherack,sucheffectswouldbeexpectedtosignificantly increaseneutronleakagefromtheracksandtherebyfurtherreducetheneutronmultiplication factor.7011R0706832 I

Figure4alsodemonstrates theacceptability ofthenewfuelstorageracksinthefloodedcondition whichcorresponds toawaterdensityof1.0gm/cc.Asshown,theneutronmultiplication factorissomewhatlessthan0;88forthefullyfloodedcondition andtherefore clearlyacceptable.

Becauseoftheconservative techniques andassumptions usedtoevaluatethemaximumpossibleneutronmultiplication factor,thereismorethanreasonable assurance thatnosignificant hazardsbasedoncriticality safetyareinvolvedinstoringfuelassemblies ofupto4.25w/oU-235intheGinna.newfuelstorageracks.7011R0706833 Table1FUELASSEMBLYCHARACTERISTICS Numberofrodscontaining U02Rodpitch(in)Overallenvelopedimensions (in)WeightofU(KgU)Activefuellength(in)EnricheduraniumregionLength(in)Enrichment (w/o)NaturaluraniumblanketregionLength(in)Enrichment (w/o)Instrument tubeMaterialO.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*Doesnotincludeweightofthestainless steelsleevesorinserts.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).O32L2~2COhlTINVOJ5 8=7u<EFNd<sFORSUPPORTSTEELWTHISAREA-SEEOM/CI.D-522-G'32CONERVAFORRADIVENljLEADEL0GERACKFOROET4/2$OFOOOOSFE'/dl072

~~Figure2SYNNETRIC HODELTOCONSERVATIVELY REPRESENT RADIALLEAKAGEOFTHEGINNANEMFUELSTORAGERACKS117.071.892107.064.108VOID-WATER7.784FUELASSEMBLIES 7.784'MATER 4'tFigure3GINNANEWFUELRACKWITHOFAAT4.25W/0U-235INFINITEMULTIPLICATION FACTORVSWATERDENSITY4>>>>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-235NEUTRONULTIPLICATiON FACTORVSWATERDENSITYiil!)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:IWITHCONSERVATIVE HOOELOFRADIALLEAKAGEj))i....,,...,.~..!'!l!)il!)!illII'jjIIIIIIl!!'!!i!;I!!!j!)!I!)!OWITHCONSERVATIVE HODELOFRADIALANDAXIALLEAKAGE!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' September 2,1983DISTRIBUTIONDocketORBReadingGDickHSmithELDattorneyDOCKETNO(S).50-244Nr.JohnE.Mlier,VicePresident ElectricandSteamProduction Rochester,.Gas andElectricCorporation 89EastAvenueRochester, NewYork14649IR.E.GINNAPLANT-OPPORTUNITY FORHEARING(APPLICATIONS 1"1,/24/81, SNUBBERREQUIREMENTS: 9/28/82,STAFFREORGANIZATION) Thefollowing documents concerning ourreviewofthesubjectfacilityaretransmitted foryourinformation.'otice ofReceiptofApplication. Draft/Final Environmental Statement, datedNoticeofAvailability ofDraft/Final Environmental Statement, datedSafetyEvaluation Report,orSupplement No.,datedNoticeofHearingonApplication forConstruction Permit.NoticeofConsideration ofIssuanceofFacilityOperating License.Application andSafetyAnalysisReport,VolumeAmendment No.toApplication/SAR datedConstruction PermitNo.CPPR-,Amendment No.,datedFacilityOperating LicenseNo.,Amendment No.,datedOrderExtending Construction Completion Date,datedElOther(Specify) CAugust23,1983(see48FR38421);theintervention periodexpiresDt

Enclosures:

Asstatedcc:w/enclosures: SeeSnextpage/gZ~/8Office,ofNuclearReacorRegulation Division-of.'icensing Operating ReactorsBranch85AOFF/cE>L:0iF5SURNAME/g~COATEP/7NROFORM318{10/80)NRCM0240OFF(CIALRECOROCOPY

Mr.JohnE.MaierCC'arryH.Voigt,EsquireLeBoeuf,Lamb,LeibyandMacRae1333NewHampshire Avenue,N.W.Suite1100Washington, D.C.20036Mr.MichaelSlade12Trailwood CircleRochester, NewYork14618EzraBialikAssistant AttorneyGeneralEnvironmental Protection BureauNewYorkStateDepartment ofLaw2WorldTradeCenterNewYork,NewYork10047ResidentInspector R.E.GinnaPlantc/oU.S.NRC1503LakeRoadOntario,NewYork14519StanleyB.Klimberg, EsquireGeneralCounselNewYorkStateEnergy'ffice AgencyBui-lding 2'mpireStatePlazaAlbany,NewYork12223Dr.EmmethA.LuebkeAtomicSafetyandLicensing BoardU.S.NuclearRegulatory Comnission Washington, D.C.20555Dr.RichardF.ColeAtomicSafetyandLicensing BoardU.S.NuclearRegulatory Coomission Washington, D.C.20555Dr.ThomasE.Murley,RegionalAdministrator NuclearRegulatory Coomission, RegionI631ParkAvenue'ingofPrussia,Pennsylvania 19406U.S.Environmental Protection AgencyRegionIIOfficeATTN:RegionalRadiation Representative 26FederalPlazaNewYork,NewYork10007HerbertGrossman, Esq.,ChairmanAtomic.SafetyandLicensing BoardU.S.NuclearRegulatory Commission Washington, D.C.20555Supervisor oftheTownofOntario107RidgeRoadWestOntario,NewYork14519JayDunkleberger NewYorkStateEnergyOffice.AgencyBuilding2EmpireStatePlazaAlbany,NewYork12223}}