ML17254A419
| ML17254A419 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/26/1985 |
| From: | KOBER R W ROCHESTER GAS & ELECTRIC CORP. |
| To: | ZWOLINSKI J A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8507030236 | |
| Download: ML17254A419 (12) | |
Text
REGUlATORYIORMATIONDISTRIBUTIONSYS(RIDS)1ACCESSIONNBR;8507030236DOCCHOATE'5/06/26NOTARIZED;NODOCKETFACIL:50244'obertEmmetGinnaNuclearPlantiUni,tliRochesterG05000244AUTH'AME>>AUTHORAFFILIATIONKOBER'rRiH~RochesterGas8ElectricCorp,RECIPtNAHE>>RECIPIENTAFFILIATIONZI>>IOLINSK43l,A~OperatingReactorsBranch5
SUBJECT:
Responds"toquestionsraisedat>>850604meetingre"critical-ity>>safetyanalysis.Calclulations8graphsprepar>>edbyPickardiLoie>>'8GarrickiIncencl-~D>>ISTR'IBUTIONCODE!AQQ1DCOPIESRECEIVED:L>>TR-'NCLSIZE',TITI.E'RSubmittal:GeneralDistributionNOTESSNRR/DL/SEP1cy,OL409/19/6905000244RECIPIENT<IDCODE/NAMEINRR4ORBSBCiOf~INTERNALACRS09ELD/HDS4NRR/DL>>DIRNRR/DL/TSRGNRR/DSI/RABRGN1.COPIESLTTRENCL>>7766fi01111RECIPIENT"IDCODE/NAHE'DM/LFMBNRR/OE/MTEB>>NRR/DL/GRABNRR/DSI/HETBQ4.'COPIESLTTRENCL'011101111EXTERNAL'.24XLPDRNSICNOTES'3>>Q511ii11EG8,GBRUSKE'gSNRCPDR02'1f,~TOTAlNUMBEROFCOPIESREQUIREDTTR29ENCL26 I~<<I~~rrIfctP>('04fils~t<>>,Ivpi~e'1Os1t"}t.l(IE>t~'0I~)g.iQi,A(tn.t~l.ixiiiI'irg(iiItf1t~.t',gtf,,~t)ii9'rtt,ttI'y"0'Qf)f.ADkt,~.I~"-t~~":tIt-st~,t,<,.~~~~I~sAq~""tI"~iX>v"Ijtt'FrI)")I,is~f~it3<gc'~iNtt't4~~t>Ar<'l)"c"Jjik'19r>>rtagc~ii,i~irf~+)g>i'~A(7<<8<l<~I)pic>lgytglgii/g)~~fJ~gfgf>tyQlt<JJ[gii'g<<rIrj,)f.lot)o@ttIi<are~~<<~lo~~>>i~<<>,sar~"stJ,~IiTQ:italI~>t"l'It~J'rttjfi:,.I(Ici')i~XTt">IT~'Tr,'X~r>'rk<tlr't9,rf~san,.).'t">>4f">~<<:.)ITIf.v)I">9P.,XI~~'H~'I:r'!tI'h't..II$j'I]'I)'i)~i>X)<t3XP'->I~t>Jtf,.tf'.II'~EJ)'jlliX,)ig(tz<P'tJ'tgq$l1i5+ii)HIXNiightpiir'I)(IIjls.),ti<i4'~lll~k<<1%>lIiIi("(IIJl~I>AgbgltdF..it"Ill<'.sjfXJofp3f")1tg",)gii,'j'~)kL,.>JI trZ>Zen>>>>>>IAHD>>>>>>)I)I>mn'I>>i!>>>>zz)EI~>>urszsilROCHESTERGASANDELECTRICCORPORA77ONo89EASTAVENUE,PtWLkElOat~4i555'MROCHESTER,N.Y.14649-0001ROGERW.KOSERVICEPt)ESIDENTELECTRICStSTEAMPI)ODUCTIONTELEPHONE*RCACODETIS546-2700June26Il985DirectorofNuclearReactorRegulationAttention:Mr.JohnA.ZwolinskiiChiefOperatingReactorsBranchNo.5U.S.NuclearRegulatoryCommissionNashingtoniD.C.20555
Subject:
ResponsetoNRCStaffQuestionsR.E.GinnaNuclearPowerPlantDocketNo.50-244
DearMr.Zwolinski:
OnFebruary27I1985IRochesterGasandElectricCorporationsubmittedanApplicationforAmendmenttoOperatingLicensetoallowthestorageofconsolidatedfuelatGinna.AtourmeetingofJune4I1985,theNRCStaffraisedseveralquestionsconcerningthecriticalitysafetyanalysis.Attached>inresponse>aresomeadditionalcalculationsperformedbyPickardiLoweandGarrick.Vrtrulyyours>RogerN.Kober850708023b85062024PDR>>))DOCK0500PP
~~Question:Pleasediscusstheeffectsoncriticalityofthestorageoffewerthan179rodsperhalfcanistersuchasinafailedfuelconfiguration.Response:Thediscussionbelowsummarizestheresultsofcalculationsperformedtodetermineattheoptimumpitchthekforfuelrodstorageinafailedfuelconfiguration.Inaddition<resultsarepresentedtoshowtheeffectofburnuponthek~ofbothaninfinitelatticeoffuelrodsandthefuelstoragerackcontainingthesefuelrodsasafunctionofthenumberoffuelrodspresentina,,consolidatedfuelrodstoragecanister'(resul,tsfo'rzeroburnupwere"previouslypresentedinFigure7ofthecriticalityanalysisin.theFebruary"27<'985submittal).ThecalculationswereperformedforanExxonfuelassemblydesignwithaninitialenrichmentof3.13w/oandforaburnupof21MWD/KGU.Thisfueltypewasselectedbecausealloftheburnupdependentinputdatarequiredforthecurrentcalculationswerereadilyavailablefromtheresultsofpreviouscalculations.However<goodestimatesofthecorrespondingresultsforthefuelstoredatWestValleywereobtainedbycomparingthek~burnupdependenceoftheExxonfuelassemblywiththatofaWCore1fuelassemblywithaninitialenrichmentof2.78w/o.Thestainlesssteeltubeswhichareintendedtocontainfailedfuelrodsforstorageinconsolidatedfuelcanistershavea0.75inchouterdiameterwithawallthicknessof0.035inch.Basedonthesetubedimensionsandthedimensionsoftheconsolidatedfuelstoragecanister>geometricconsiderationslimitthenumberoftubesthatcanbeaccommodatedinone-halfofacanisterto55whentherodsarearrangedonatriangularorhexagonalpitch.Ifthetubescouldbeconstrainedtoasquarepitch>thelimitingnumberoftubeswouldbereducedto50perhalfcanister.Usingthesetwocasesasalowerlimitonthewater-to-nonwatervolumeratio,thisratiowasthenincreasedbyincreasingthepitchonasquarelattice<andtheresultingkisshowninFigure1foraninfinitelatticeofstainlesssteeltubescontainingExxontypefuelrodsat3.13w/oinitialandwithaburnupof21MWD/KGU.Duetothepresenceofthestainlesssteeltubes<themaximumk~ofabout0.83isobtainedforthedryestlattices>andincreasingthewatervolume(byincreasingthepitch)resultsinauniformreductioninkduetoincreasedneutronabsorptioninthestainlesssteeltubesand/orthewater.Basedonthelowk~'sobtainedforaninfinitelatticeofthesefuelrods<thereisnoneedtoevaluatethereductionink~which
~~ihk wouldoccuriftheserodswereplacedincanistersandstoredintheRegion2racks.Asimilarsetofcalculationswereperformedusingthesamefuelrodsbutwithoutthepresenceofthestainlesssteeltubes.Inthiscasethemaximumnumberoffuelrodsperhalfcanisteris179.TheresultsareshowninFigure2forboththekofaninfinitelatticeandthehofthestoragerackcontainingthecanisters.Inthiscase>themaximumlatticehisabout1.16>butthemaximumrackk~isonlyabout0.87.Figure3showsacomparisonofkvs.burnupbehaviorforanExxonfuelassemblyat3.13w/oanda2.78w/ofuelassemblystoredatWestValley.Thek~ofthetwotypesoffuelassembliesisthesameforaburnupof21MWD/KGU;sothedatashowninFigures1and2shouldalsobeapplicabletoWestValleyfuelassemblieswithaburnupof21MWD/KGU.However>theminimumburnupofthefuelassembliesstoredatWestValleyisabout15.5MWD/KGUforaninitialenrichmentof2.795w/o.Thek~ofthe2.78w/ofuelassembliesataburnupof15.0MWD/KGUwasselectedasbeingrepresentativeoftheminimumburnup-maximumkfuelstoredatWestValley~andbasedonthedatashowninFigure3<thedifferenceink~forthisfuelatburnupsof21and15MWD/KGUis.05356k~.ThisreactivitydifferencehasbeenappliedtothedatageneratedfortheExxonfuelandtheresultsareshowninFigures4and5.ThesefiguresshowthatfortheminimumburnupmaximumhfuelstoredatWestValley<themaximuminfinitelatticehforthefuelrodsinstainlesssteeltubesisabout0.88~andfor.thefuelrodsstoredincanistersinthestoragerack>themaximumk~isabout0.93.However<asituationinwhichbetween75and100fuelrodsperhalfcanisterareuniformlyspacedinmorethanonestoragerackpositionwouldhavetobeconsideredalowprobabilityaccidentsituation.Inthatcase<creditshouldbeallowedforthepresenceof2000ppmboronwhichwouldfurtherreducethek~oftherackbymorethan.20hkInconclusionthereappearstobenocriticalitysafetyconcernsforstorageoffailedornonfailedfuel.
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