ML17328A937

Application for Amend to License DPR-74,changing Tech Specs to Revise Boric Acid Storage Tank Vol Requirements for Modes 1 Through 4 to 5,650 Gallons to Reflect Boron Concentration Requirements Specific to Cycle 8

ML17328A937
Person / Time
Site:	Cook
Issue date:	02/15/1991
From:	ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17328A938	List: ML17328A937 ML17328A939
References
AEP:NRC:1139, NUDOCS 9102260036
Download: ML17328A937 (11)

Text

IACCELERATEDDISTBUTIONDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9102260036DOC.DATE:91/02/15NOTARIZED:NODOCKETFACIL:50-316DonaldC.CookNuclearPowerPlant,Unit2,Indiana605000316AUTH.NAMEAUTHORAFFILIATIONALEXICH,M.P.IndianaMichiganPow'erCo.(formerlyIndianaEMichiganEleRECIP.NAMERECIPIENTAFFILIATIONMURLEY,T.E.DocumentControlBranch(DocumentControlDesk)

SUBJECT:

ApplicationforamendtoLicenseDPR-74,changingTechSpecstoreviseboricacidstoragetankvolrequirementsforModes1through4to5,650gallonstoreflectboronconcentrationrequirementsspecifictoCycle8.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTR(ENCLfSIZE:7+lg-TITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-1LACOLBURN,T.INTERNAL:NRR/DET/ECMB9HNRR/DOEA/OTSBl1NRR/DST/SELB8DNRR/DST/SRXB8EOCEGMXQ'1EXTERNAL:NRCPDRCOPIESLTTRENCL112211111111101111RECIPIENTIDCODE/NAMEPD3-1PDNRR/DET/ESGBNRR/DST8E2NRR/DST/SICB7ENUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBNSICCOPIESLTTRENCL1111111111101111NOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLINISFORDOCUMENTSYOUDON'TNEED!/f/7TOTALNUMBEROFCOPIESREQUIRED:LTTR~ENCL

'4~~~IndianaMichiganPowerCompanyP.O.Box16631Columbus,OH43216AEP:NRC:1139DonaldC.CookNuclearPlantUnit2DocketNo.50-316LicenseNo.DPR-74TECHNICALSPECIFICATIONCHANGEREQUESTBASTVOLUMEREDUCTIONU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.EDMurleyFebruary15,1991

DearMr.Murley:

ThisletteranditsattachmentsconstituteanapplicationforachangetotheTechnicalSpecifications(T/Ss)forDonaldC.CookNuclearPlantUnit2.Specifically,werequestthattheboricacidstoragetank(BAST)volumerequirementforModes1through4bechangedto5650gallonstoreflecttheboronconcentrationrequirementsspecifictoCycle8withadditionalconservatismstocoverfuturecycles.ThereductionintherequiredBASTvolumewillenhancetheabilityoftheplanttomaintaintherequiredboricacidconcentrationinthehighpressuresafetyinjectionflowpath.Itwillconcurrentlyreducethepotentialforboricacidblockagesassociatedwiththeboricacidevaporator.ThisrevisionwillalsomaketheUnit2requirementidenticaltotheUnit1requirement.Wedesiretoimplementthesechangespriortothestartofournextrefuelingoutage,whichisscheduledforearly1992.DuringtheUnit2Cycle8reloadsafetyevaluationprocess,WestinghouseperformedcalculationstodeterminetheBASTminimumborationvolumerequirementsforModes1through4,ThosecalculationswereboundingandresultedinanincreaseintherequiredminimumBASTboratedwatervolumefrom5650to7715gallons(T/S3.1,2.8).Theadditionalvolumehasincreasedthepotentialformaintenanceproblemswithinthissystem.Furtherreviewoftheassumptionsusedintheabovecalculationindicatedthatsomeconservatismscouldbeeliminated.WethereforecontractedWestinghousetocalculateamoreaccurateminimumborationvolumerequirement.Theresultsofthiscalculationjustifiedaminimumborationvolumeof4905gallons.TheseresultsarecontainedinAttachment1tothisletter.Toachieveconsistencybetweenthe;~<<226<<K0so003<<.0036910215'.DR-ADOCpclg~.gag(98EiP'f'PPI/(

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~~Dr.T.E.Murley-2-AEP:NRC:1139Unit1andUnit2technicalspecifications,andtobeconservative,wearerequestingthattheminimumborationvolumerequiredbyT/S3.1.2.8equal5650gallons.Inaddition,severalchangestoT/SpageB3/41-3arebeingmadetoreflecttheresultsoftheenclosedWestinghouseanalysis.Specifically,themaximumexpectedborationcapabilityusablevolumerequirementfromtherefuelingwaterstoragetank(RWST)hasbeenreducedfrom"160,122gallons"to"69,215gallons."OurevaluationconcerningsignificanthazardsconsiderationsisprovidedinAttachment2,TheproposedrevisedT/SspagesareincludedinAttachment3.AcopyoftheexistingT/Sspagesmarked-uptoreflectthechangesproposedinthissubmittalareincludedinAttachment4.ThetechnicalspecificationsthatweareproposingtoreviseinthissubmittalarenotimpactedbyanyotherrequeststhatarependingNRCreviewandapproval.Webelievethattheproposedchangewillnotresultin(1)asignificantchangeinthetypesofeffluentsorasignificantincreaseintheamountsofanyeffluentthatmaybereleasedoffsite,or(2)asignificantincreaseinindividualorcumulativeoccupationalradiationexposure.TheproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommitteeandbytheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.J.R.PadgettoftheMichiganPublicServiceCommissionandtotheMichiganDepartmentofPublicHealth.ThisdocumenthasbeenpreparedfollowingCorporateproceduresthatincorporateareasonablesetofcontrolstoensureitsaccuracyandcompletenesspriortosignatureoftheundersigned.Sincerely,M.P.AlexchVicePresidentMPA/ehAttachments Dr.T.E.Murley-3-AEP:NRC:1139cc:D.H.Williams,Jr.A.A.Blind-BridgmanJ.R.PadgettG.CharnoffNFEMSectionChiefA.B.Davis-RegionIIINRCResidentInspector-Bridgman ATTACHMENT1TOAEP:NRC:1139WESTINGHOUSEENGINEERINGCALCULATIONSUMMARY OOHALDC.COOKNUCLEARPLANTUNIT2ENGINEERINGCALCULATIOHSUMMARYOFTHEMINIMUMBORICACIOTANKVOLUMEREQUIREMENTFORCYCLE8OPERATIONPageIof3 01I BACKGROUNDAspartoftheefforttosupportCycle8operationoftheDonaldC.CookUnit2NuclearPlantwithWestinghouseVANTAGE5Fuel,WestinghouseperformedcalculationstodeterminetheBoricAcidStorageTank(BAST)minimumborationvolumerequirementsasdelineatedinTechnicalSpecifications3.1.2.7and3.1.2.8.TheresultsofthesecalculationsindicatedthattheminimumboricacidtankvolumerequiredtoreachHode4fromMode1exceededthethencurrentTechnicalSpecificationlimit(T.S.3.1.2.8).TheminimumborationvolumerequiredtoreachMode6fromMode5waswellwithintheTechnicalSpecificationlimit(T.S.3.1.2.7).FurtherreviewoftheassumptionsemployedinthecalculationoftheminimumborationvolumerequiredtoreachMode4revealedthatconservatismscouldbeeliminatedfromtheprojectedHode1andMode4finalboronconcentrationassumptionswhichwouldprovidesomereliefintheoriginalcalculationoftheminimumBoricAcidStorageTankvolumerequirement.INTROOUGTIONAttherequestofAmericanElectricPowerServiceCorporation(AEPSC),WestinghousehasrecalculatedtheminimumborationvolumerequiredtocooldownfromMode1toMode4withrevisedfinalboronconcentrationassumptions.Forconsistency,theconservatismsinthepreviousMode5and6finalboronconcentrationswerealsoeliminatedandtheminimumBASTvolumerequiredinModes5and6hasbeenrecalculated.ThecalculationshavebeenperformedusingboronconcentrationdatawhichismoreaccuratethanemployedintheoriginalcalculationoftheBoricAcidStorageTankminimumvolumerequirementforUnit2Cycle8operation.ThemethodemployedinthecalculationoftheBASTminimumvolumerequirementsisbrieflydescribedbelow.EVALUATIONEvaluationMethodsTheBORDERcomputercodewasusedtoperformthecalculation.TheBORDERcode,developedbytheWestinghouseCommercial'NuclearFuelsDivision,performscalculationswhichdetermineifboronrequirementsdictatedbyfuelreloaddesignarewithinexistinglimitsspecifiedintheTechnicalSpecificationsandtheFSAR.Page2of3 I1 ResultsTheminimumborationvolumecalculatedtoberequiredintheBoricAcidStorageTanktocooldown.fromMode1toHade4was4905gallons,whichislessthantheminimumvolumeof7715gallonsspecifiedinTechnical'pecification3.1.2.8.TheequivalentcontainedborationvolumeintheRefuelingMaterStorageTank(RWST)forcooldownfromMode1toNode4wascalculatedtobe69,215gallons(TechnicalSpecification3.1.2.8requiresaminimumvolumeof350,000gallonsbasedonEmergencyCoreCoolingSystemrequirements).ForcooldownfromHode5toHode6,TechnicalSpecification3.1.2.7requiresaminimumusable'oratedwatervolumeof4300gallonsintheBASTand90,000gallonsintheRWST.TheminimumborationvolumecalculatedtoberequiredintheBASTtocooldownfromHode5toMode6was298gallons.TheequivalentcontainedborationvolumeintheRWSTforcooldownfromHode5toHode6was2408gallons.CONCLUSIONSTheresultsofthecalculationindicatethattherelaxationoftheminimumborationvolumerequirementspecifiedinTechnicalSpecification3.1.2.8forDonaldC.CookNuclearPlantUnit2canbeaccommodated.MarkupsoftheUnit2TechnicalSpecificationsindicatingtherelaxedrequirementhavebeenprovidedforAEPSC'suseinthesubmittalofachangetotheTechnicalSpecifications.Asstatedpreviously,additionalconservatismwasincludedintheMode4/5/6boronconcentrationstoaccommodatevariationsinfuturecyclesprovidedcurrentfuelmanagementtechniquesandfuelproductdesignsaremaintained.Therefore,itisexpectedthattheboronconcentrationrangesassumedforthedeterminationoftheminimumborationvolumerequirementsforModes1through6canboundfuturecyclesofoperationoftheDonaldC.CookNuclearPlantUnit2.Page3of3