ML17334B656
| ML17334B656 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/08/1997 |
| From: | FITZPATRICK E INDIANA MICHIGAN POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17333B076 | List: |
| References | |
| AEP:NRC:0900K, AEP:NRC:900K, NUDOCS 9710150014 | |
| Download: ML17334B656 (27) | |
Text
CATEGORYj.REGUL*TOhOINPORN*TIONDISTRIBUTION-TEN-(RIDE)ACCESSIONNBR:9710150014DOC.DATE:97/10/08NOTARIZED:YESDOCKET0FACIL:50-315DonaldC.CookNuclearPoeerPlantiUnit1IIndianaM0500031550-316DonaldC.CookNuclearPowerPlantiUnit2IIndianaM05000316AUTH.NAMEAUTHORAFFILIATIONFITZPATRICK'.AmericanElectricPoeerCo.IInc.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)
SUBJECT:
ApplicationforamendstolicensesDPR-58ZcDPR-78IrequestTSs3/4.6.5reiceeeighth3/4.5.5rebasesrefuelingeaterstoragetankchange.Proprietarysummaryofrecirculationsumpencl.Proprietaryinfoeithheld.per10CFR2.790.DISTRIBUTIONCODE,'*PDIDCOPIES.RECEIVED:LTRIENCLlSIZE:+(DTITLE:,ProprietarjRevieeDistribution-PreOperatingLicense5OperatingRNOTES:ERECIPIENTIDCODE/NAME-PD3-3LAHICKMANIJCOPIESLTTREEL111'ECIPIENTIDCODE/NAMEPD3-3PDCOPIESLTTRENCL10RINTERNAL:~CENTER01OGC/HDS21'EXTERNAL:NRCPDR',CUENNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROFCOPIESREQUIRED:LTTR6ENCL 1~~*Ai,l~
IndianaMIchiganPowerCompany500CircleDriveBuchanan,MI491071395tNOIAMANICHIGANPQWMOctober8,1997AEP:NRC:0900K10CFR50.90DocketNos.:50-31550-316U.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskWashington,D.C.20555Gentlemen:DonaldC.CookNuclearPlantUnits1and2REQUESTFOREXIGENTTECHNICALSPECIFICATIONAMENDMENTTECHNICALSPECIFICATION3/4.6.5ICEWEZGHTANDSURVEILLANCEREQUIREMENTANDTECHNICALSPECIFICATION3/4.5.5BASISREFUELINGWATERSTORAGETANKCHANGEPursuantto10CFR50:91(a)(5),weproposetoamendbothtechnicalspecification(T/S)3/4.6.5,andtheT/S3/4.6.5and3/4.5.5basisofCookNuclearPlantunits1and2,andrequesttheNRCgrantthisasanexigentamendment.Thisletterandits.attachmentsconstituteanapplicationfortheexigentamendment.Thisamendmentwillincreaseboththeminimumrequiredicemasspericebasket,thetotalminimumrequiredicemass,andchangesthebasisfortheT/S.ThechangeintheT/S3/4.5.5basisisconsideredtobeanunreviewedsafetyquestion.Theanalysissupportingthechangeiniceweightconcludesthatbothwaterfromtherefuelingwaterstoragetank(RWST)andwaterfrommeltedicearerequiredtoprovideanadequatesumpinventoryforthelimitingcalculation.TheuseofwaterfrommeltediceisconsideredareductioninthemarginofsafetyasdefinedintheT/Ss.ThepresentwordingofT/S3/4.5.5basiscanbeinterpretedtomeanthattheonlywaterintherecirculationsumpthatcanbecreditedinthesafetyanalysisisthatfromtheRWST.Attachment1providesadescriptionofthechange,thebackgroundandreasonforthechange,thejustificationforexigentreviewandapproval,thejustificationforthechange,andouranalysesconcerningsignificanthazardsconsiderations.Attachment2providesthecurrentT/Spages,marked-uptoreflecttheproposedchanges.Attachment3providestheproposedrevisedT/Spages.Attachment4providesthedatasupportingthesublimationrates.Attachment5providesFauskeaAssociates'roprietarysummaryoftherecirculationsumpinventorycalculationthatsupportstheT/Schange.Attachment6providesFauske&Associates'ffidavitandjustificationforwithholdingproprietaryinformationfrompublicdisclosureinaccordancewith10CFR2.790.Q~p',L-Tk.~l.Lilllllllllllllllllllll)IIIIIIIII'llllll@'I'7i01500f4971008PDRADOCK050003i5'OR$Webelievetheproposedchangeswillnotresultin:1)asignificantchangeinthetypesofeffluentsorasignificantincreaseinthe.amountsofanyeffluentsthatmaybereleasedoffsite;or2)asignificantincreaseinindividualorcumulativeoccupationalradiationexposure.
U.S.NuclearRegulatoryCommissionPage2AEP:NRC:0900KThischangeintheminimumrequiredicemassispartoftheresolutionofissuesraisedduringtherecentarchitectengineerdesigninspectionatCookNuclearPlant.Therevisedicemassisusedasinputtothecalculationofrecirculationsumpwatervolumeduringaloss-of-coolantaccident.Asummaryofthelimitingcalculationforsmallbreakloss-of-coolantaccidentisprovidedinattachment5.Thissummaryincludesthesignificantcodeinputparametersandthecalculationresults.Theinputparametersinattachment5havebeenreviewedbyourpersonnel,andwehaveconcludedthattheinputparametersaccuratelyreflectthecurrentCookNuclearPlantdesign.Theproposedchangeshavebeenreviewedbytheplantnuclearsafetyreviewcommittee,andwillbereviewedbythenuclearsafetyanddesignreviewcommitteeatitsnextregularlyscheduledmeeting.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtotheMichiganPublicServiceCommissionandtheMichiganDepartmentofPublicHealth.Sincerely,pm+E.E.FitzpatrickVicePresidentSWORNTOANDSUBSCRIBEDBEFOREMETHISRDAYOF0~~11997Jf("(>NotaryPublicMyCommissionExpiresvbAttachmentsJANWATSONNOTARYPUHUC,BERRlENCNNTY,MlMYCOMMSSIONEXPlRESFEB.<0,<999A.A.BlindA.B.BeachMDEQ-DW6cRPDNRCResidentInspectorJ.R.Padgett ltlpI-ATTACHMENT6TOAEP:NRC:0900KFAUSKE6cASSOCIATES'FFIDAVITANDJUSTIFICATIONFORWITHHOLDINGPROPRIETARYINFORMATIONFROMPUBLICDISCLOSURE 1
STATSOFIL,LINOISCOUNTYOPDUPAGBBeforeme,theundersignedauthority,personallyappearedRobertH.Henry,who,beingbymedulyswornaccordingtolaw,deposesandsaysthatheisauthorizedtoexecutethisAf6davitonbehalfofPauskeEcAssociates,Inc.,awhollyownedsubsidiaryoftheWestinghouseHectricCoqmration("Westinghouse")andthattheavermentsoffactsetforthinthisAffidavitaretrueandcorrecttothebestofhisknowledge,information,andbelief.RobertE.HenrySeniorVicePresidentProcessSafetyDepartmentSworntoandsubscribedbeforemethisP"-'ay,1997OFFICIALggpLHANSlQ(STIANFAUSKEROTARYPU8UC,SgTEQpQIIIQISMYCOMMISS!OMEXPIRES621200$JfotaryPublic (1)IamSeniorVicePresidentinchargeoftheProcessSafetyDepartmentofPauske&Associates,Inc.,awhollyownedsubsidiaryofWestinghouseElectricCorporationandassuch,Ihavebeenspecificallydelegatedthefunctionofreviewingtheproprietaryinformationsoughttobewithheldfrompublicdisclosureinconnectionwithiiuciearpowerplantlicensing,andamauthorizedtoapplytoitswithholdingonbehalfoftheWestinghouseEnergySystemsBusinessUnit.(2)IammaMngthisAffidavitinconformancewiththeprovisionsof10CFRSection2.790oftheCommission'sregulationsandinconjunctionwiththeWestinghouseapplicationforwithholdingaccompanyingthisAffidavit.(3)IhavepersonalKnowledgeofthecriteriaandproceduresutilizedbytheWestinghouseEnergySystemsBusinessUnitindesignatinginformationasatradesecret,privilegedorasconfidentialcommercialorfinancialinformation.(4)Pursuanttotheprovisionsofparagraph(b)(4)ofSection2.790oftheCommission'sregulations,thefollowingisfurnishedforconsiderationbytheCommissionindeterminingwhethertheinformationsoughttobcwithheldfrompublicdisclosureshouldbewithheld.(i)TheinformationsoughttobewithheldfrompublicdisclosureisownedandhasbeenheldinconfidencebyWestinghouse.(ii)TheinformationisofatypecustomarilyheldinconfidencebyWestinghouseandnotcustomarilydisclosedtothepublic.Westinghousehasarationalbasisfordeterminingthetypesofinformationcustomarilyheldinconfidencebyitand,inthatconnection,utilizesasystemtodeterminewhenandwhethertoholdcertaintypesofinformationinconfidence.TheapplicationofthatsystemandthesubstanceofthatsystemconstitutesWestinghousepolicyandprovidestherationalbasisrequired.2/6 Underthatsystem,informationisheldinconfidenceifitfallsinoneormoreofseveraltypes,thereleaseofwhichmightresultinthelossofanexistingorpotentialcompetitiveadvantage,asfollows:(a)Theinformationrevealsthedistinguishingaspectsofaprocess(orcomponent,structure,tool,method,etc.)wherepreventionofitsusebyanyofWestinghouse'scompetitorswithoutlicensefromWestinghouseconstitutesacompetitiveeconomicadvantageoverothercompanies.(b)Itconsistsofsupportingdata,includingtestdata,relativetoaprocess(orcomponent,structure,tool,method,etc.),theapplicationofwhichdatasecuresacompetitiveeconomicadvantage,e.g.,byoptimization,orimprovedmarketability.(c)Itsusebyacompetitorwouldreducehisexpenditureofresourcesorimprovehiscompetitivepositioninthedesign,manufacture,shipment,installation,assuranceofquality,orlicensingasimilarproduct.(d)Itrevealscostorpriceinformation,productioncapacities,budgetlevels,orcommercialstrategiesofWestinghouse,itscustomersorsuppliers.(e)Itrevealsaspectsofpast,present,orfutureWestinghouseorcustomerfundeddevelopmentplansandprogramsofpotentialcoinmercialvaluetoWestinghouse.(f)Itcontainspatentableideas,forwhichpatentprotectionmaybedesirable.(g)ItisnotthepropertyofWestinghouse,butmustbetreatedasproprietarybyWestinghouseaccordingtoagreementswiththeowner,3/6 IThere,aresoundpolicyreasonsbehindtheWestinghousesystemwhichincludethefollowing:(a)TheuseofsuchinformationbyWestinghousegivesWestinghouseacompetitiveadvantageoveritscompetitors.Itis,therefore,withheldfromdisclosuretoprotecttheWestinghousecompetitiveposition.(b),Itisinformationwhichismarketableinmanyways.TheextenttowhichsuchinformationisavailabletocompetitorsdiminishestheWestinghouseabilitytosell.productsandservicesinvolvingtheuseoftheinformation.(c)UsebyourcompetitorwouMputWestinghouseatacompetitivedisadvantagebyreducinghisexpenditureofresourcesatourexpense.(d)Eachcomponentofproprietaryinformationpertinent,toaparticularcompetitiveadvantageispotentiallyasvaluableasthetotalcompetitiveadvantage.Ifcompetitorsacquirecomponentofproprietaryinformation,anyonecomponentmaybethekeytotheentirepuzzle,therebydeprivingWestinghouseofacompetitiveadvantage.(e)UnrestricteddisclosurewouldjeopardizethepositionofprominenceofVifestinghouseintheworldmarket,andtherebygiveamarketadvantagetothecompetitionofthosecountries.(f)TheWestinghousecapacitytoinvestcorporateassetsinresearchanddevelopmentdependsuponthesuccessinobtainingandmaintainingacompetitiveadvantage.(iii)TheinformationisbeingtransmittedtotheCommissioninconfidenceand,undertheprovisionsof10CFRSection2.790,itistobereceivedinconfidencebythe4/6 Commission.(iv)Theinformationsoughttobeprotectedisnotavialableinpublicsourcesoravailableinformationhasnotbeenpreviouslyemployedinthesameoriginalmannerormethodtothebestofourknowledgeandbelief.(v)TheproprietaryinformationsoughttobewithheldinthissubmittalispresentedinSections2and3ofthedmQreportentitled"MAAP4SmallBreakLOCAAnalysesfartheD.C.CookP]ant".TheproprietaryinformationassubmittedforusebyIndianaMichiganPowerCompanyforDonaldC.Cook¹clearPlantUnit1maybeapplicableinotherlicensesubmittalsinresponsetocertainNRCrequirements..ThisinformationispartofthatwhichwillenableWestinghousetoassistthecustomertoobtainNRCapproval.Purtherthisinformationhassubstantialcommercialvalueasfollows:(a)%westinghouseplanstoselltheuseofsimilarinformationtoitscustomersforpurposesofmeetingNRCrequirementsforlicensingdocumentation.(b)Westinghousecansellsupportanddefenseofthetechnologytoitscustomersinthelicensingprocess.PublicdisclosureofthisproprietaryinformationislikelytocausesubstantialharmtothecompetitivepositionofWestinghousebecauseitwouldenhance'theabilityofcompetitortoprovidesimilarmethodologiesandlicensingdefenseservicesforcommercialpowerreactorswithoutcommensurateexpenses.Also,publicdisclosureoftheinformationwouldenableotherstousctheinformationtomeetNRCrequirementsforlicensingdocumentationwithoutpurchasingtherighttousetheinformation.5/6 ThedevelopmentofthetechnologydescribedinpartbytheinformationistheresultofapplyingtheresultsofmanyyearsofexperienceinanintensiveWestinghouseeffortandtheexpenditureofaconsiderablesumofmoney.3norderforcompetitorsofWestinghousetoduplicatethisinformation,similartechnicalprogramswouldhavetobeperformedandasigni6cantmanpowereffort,havingthe~uisitetalentandexperience,wouMhavetobeexpandedfordevelopingtestingandanalyticalmethodsandperformingtests.Purtherthedeponentsayethnot.6/6
,97101500>4~ATTACHMENT1TOAEP:NRC:0900KDESCRIPTIONOFCHANGE,BACKGROUNDANDREASONFORCHANGE/JUSTIFICATIONFOREXIGENTREVIEWANDAPPROVAL,JUSTIFICATIONFORCHANGEAND10CFR50.92ANALYSES
Attachment1toAEP:NRC:0900KPage1DescritionofAmendmentReestTechnicalspecification(T/S)3.6.5.1.drequiresthateachicebasketcontainatleast1220poundsofice,andT/Ssurveillance4.6.5.1.b.2requiresaminimumtotaliceweightof2,371,450poundsforeachunit.ThisrequestforaT/Schangeincreasesboththeminimumicebasketweightrequirementandtheminimumtotalweightrequirement:Also,thebasisfortheT/Sisbeingrevisedtodecreasethequantityassumedforsublimationlossesfrom10%to5%'.T/S3/4.5.5basisisbeingrevisedforclarification.BackroundandReasonforChaneThisT/Sandsurveillancearecurrentlyrequiredforoperationinmodes1,2,3,and4.Duringaloss-of-coolantaccident(LOCA),waterfromseveralsources(e.g.,refuelingwaterstoragetank(RWST),reactorcoolantsystem(RCS),accumulators,andmeltedice)collectinthelowerregionsofthecontainment,partofwhichactsasasump(i.e.,recirculationsump)fortherecirculationofwaterthroughthesafetyinjectionandcontainmentspraysystems.Astheaccidentprogresses,theRWST,theinitialsourceofwaterfortheemergencycorecooling(ECCS)andcontainmentspraysystems,emptiesandthewaterthathasaccumulatedinthelowerregionsofthecontainmentisusedasthesourceofwaterforthesafetyinjectionandcontainmentspraysystems.Thewaterlevelintherecirculationsumpmustbehighenoughtoprovidesufficientnetpositivesuctionheadtothepumps,andtopreventvortexingintherecirculationsump.DuringtherecentarchitectengineerinspectionconductedatCookNuclearPlant,itwasdeterminedthat,becauseofinstrumentuncertainties,theswitchovertotherecirculationmodemightoccurbeforeasufficientvolumeofRWSTwaterhadbeeninjectedintothecontainment.This,whenconsideredwithourlowercontainmentdesignthatallowssomecontainmentsprayflowtobecometrappedinthedeadendedannulusregion,raisedaconcernastowhetherthelimitingvortexingheightrequirementsfortheRHRandCTSpumpscouldbemetthroughoutthetransient.Asaresult,evaluationsfortransientsumplevelforsmallbreakloss-of-coolantaccident(SBLOCA)andlargebreakloss-of-coolantaccidentwereperformed.ThelimitingevaluationistheSBLOCA,duetoitslowerRCSandaccumulatormassrelease.AcalculationperformedforSBLOCAindicatesthatitisnecessarytocreditmoreoftheavailableicecondensericemassthancurrentlylistedintheT/S.ThecurrentT/Sandbasisstatementsrequirethat:T/S3/4.6.5T/S3/4.6.5Eachicebaskethaveatleast1220poundsofice.Theminimumtotalicecondensericeweightata95%levelofconfidenceshallbecalculatedusingallicebasketweightsdeterminedduringthisweighingprogramandshallnotbelessthan2,371,450pounds.
Attachment1toAEP:NRC:0900KPage2T/S3/4.6.5BasisT/S3/4.5.5BasisTheminimumweightfigureof1220poundsoficeperbasketcontainsa10%conservativeallowanceforicelossthroughsublimation,whichisafactorof10higherthanassumedfortheicecondenserdesign.ThelimitsonRWSTminimumvolumeandboronconcentrationensurethat:1)sufficientwaterisavailablewithincontainmenttopermitrecirculationcoolingflowtothecore.Weareproposingtochangetheserequirementsto:T/S3/4.6.5Eachicebaskethaveatleast1333poundsofice.T/S3/4.6.5Theminimumtotalicecondensericeweightata95%levelofconfidenceshallbecalculatedusingallicebasketweightsdeterminedduringthisweighingprogramandshallnotbelessthan2,590,000pounds.T/S3/4.6.5BasisT/S3/4.5.5BasisTheminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservativeallowanceforicelossthroughsublimation.ConsistentwiththeapplicableLOCAanalyses,thelimitsonRWSTminimumvolumeandboronconcentrationensurethat:1)whencombinedwithwaterfrommeltedice,theRCS,andtheaccumulators,sufficientwaterisavailablewithincontainment,topermitrecirculationcoolingflowtothecore.JustificationforExientReviewandAroyalCookNuclearPlantT/Ssrequirethattheicecondenserbeinmodes1,2,3,and4.Tomeetthisrequirement,condensermustcontainsufficienticetocondensethesystemvolumereleasedduringaLOCA,andtoprovideanamountofwatertotherecirculationsumpsothatthewaterfromallsourcesissufficienttoenablethe,RHRpumpstofunctionproperly.operabletheicereactoradequatecombinedandCTSTheamountoficepresentlytakencreditfor(perbasketandtotal)inourcurrentT/Sminimumiceweightsislessthanwhatisneededtomaintainthesumplevelabove602'0".Basedonamodeltestin1977,waterlevelof602'0"issufficienttopreventpumpvortexingatmaximumsafeguardsflow.TheproposedchangestotheT/Swilltakecreditformoreoftheavailableicetoprovidereasonableassurancethatsufficientwatertomaintain602'0"elevationisachieved.OnSeptember18,1997,oursubmittalAEP:NRC:126061wassenttotheNRC,providingadiscussionoftheactionswearetakingtoaddresstechnicalissuesidentifiedbytherecentlycompletedarchitectengineerteaminspection.Weareanticipatingthecommencementof
Attachment1toAEP:NRC:0900KPage3startupactivitiesinseveralweeks,andrespectfullyrequesttheNRC'sreviewandapprovalonanexigentbasis.Weunderstandtheimpactofsuchanexigentrequest,andrecognizethattheconditionsandstatusofCookNuclearPlant'srestartmaychangeinthefuture.We'ntendtokeepthecommissioninformed,throughourdailycontactwithourNRRprojectmanager,astothestatusofourrestartschedule.JustificationForChaneInmodes1,2,3,and4,theicecondenserisrequiredtobeoperable.Tobeconsideredoperable,theicecondensermustbecapableofcondensingsteam,providingboratedwatertotherecirculationsump,andbecapableofmaintainingitsstructuralintegrity.Additionally,becausethewaterfromthemeltedicecombineswithwaterfromtheRWST,theRCS,andtheaccumulators,thetotalamountofwaterfromallsourcesmustnotcausethewaterlevelincontainmenttoresultinthesubmergenceofequipmentrequiredtosafelyshutdownthereactor.Thestructuralanalysisfortheicebasketshasshownthattheywillmaintaintheirstructuralintegrityataweightof1877pounds(icebasketplusiceweight).Weadministrativelycontrolicebasketweightsothaticebasketstructuralintegrityisnotadverselyimpacted.Safetyrelatedequipmentlocatedinsidethecontainmentisprotectedfrombeingsubmerged,sincetheequipmenthasnotbeenqualifiedforsubmergence.Inmanyinstances,theprotectionagainstsubmergenceisachievedbylocatingtheequipmentabovethecalculatedflooduplevel.Thefloodupanalysisfortheplantassumedthattheicecondensercontained3,000,000poundsofice.TherevisedT/Svalueof2,590,000poundsoficeislessthanthevalueusedinthefloodupevaluation.Theminimumrequiredquantityoficehasbeendeterminedusinganallowanceof5%forsublimation.Thisisareductionfromthe10%.valueusedinthepresentT/S,andhasbeendeterminedonthebasisofhistoricalaveragechangesinicemass.Usingdatafromthelastthirteenyears,theaveragemeasuredchangeinicemassoveraneighteenmonthperiodwas2.31%forunit1,and2.68%forunit2.Thedatausedtodeterminethesublimationratesaregiveninattachment4.T/S3/4'.5basisisbeingrevisedtoclarifythatwatersourcesinadditiontowaterintheRWSTarerequiredtoprovideasufficientquantityofwatertoensurethatthereisnovortexingintherecirculationsump,andthatthereissufficientnetpositivesuctionhead.ThecurrentbasiswordingcanbeinterpretedtomeanthatthewaterfromtheRWSTmust,byitself,besufficienttomeet"theserequirements.TherevisedwordingwillbeconsistentwiththecurrentwordinginthebasisofT/S3/4.6.5.7whereinitisstatedthat,"Theoperabilityoftheicecondenserfloor...drainsensuresthatfollowingaLOCA,thewaterfromthemeltedice...hasaccess...tothesump.This...ensurestheavailabili.tyofthewaterforlongtermcoolingofthereactorduringthepostaccidentphase."BasisForNoSinificantHazardsDetermination 1
Attachment1toAEP:NRC:0900KPage4Inaccordancewith10CFR50.92,theproposedchangesdonotinvolveasignificanthazardsconsiderationifthechangesdonot:involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated;createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated;or3.involveasignificantreductioninamarginofsafety.Criterion1Thisamendmentrequestdoesnotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.Thechangeincreasestheminimumiceweight'equirements,ensuringthattherewillbesufficientwater(i.e.,aminimumsumplevelof602'0")intherecirculationsumpfromthetimeofswitchoveruntilanequilibriumlevelisreached.ThiswillprovideadequatesumplevelfortheRHRandCTSpumpstofunctionproperly,andprovidesufficientflowtomeetaccidentrequirements.Criterion2Theproposedchangedoesnotcreatethepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated.Thischangeincreasestherequiredminimumamountoficeintheicecondenser.Itdoesnotalteranyotherphysicalcharacteristicsoftheicebaskets,nordoesitchangetheicecondenser'sfunction.Noknownfailuremechanismsareintroducedbythischange.Criterion3Thisproposedchangedoesnotinvolveasignificantreductioninamarginofsafety.Thechangeincreasestheminimumheatabsorbingcapabilityoftheicecondenser,andensuresthattherewillbeasufficientquantityofmeltedicetomaintainthedesiredminimumsumplevelof602'0"fromthetimeofswitchover.ThiswillprovideanadequatesumplevelfortheRHRandCTSpumpsfollowingswitchovertotherecirculationphase.Thereductionintheallowancefor.icesublimationdoesnotsignificantlyreducethemarginofsafety.Theoriginalallowancewasconservativelyestimatedtobetentimesthedesignvalue.Atthetimethisallowancewasmade,therewasnodatafordeterminingtheactualsublimationrate.Datatakensince1984hasshownthattheaveragemeasuredsublimationrateis2.31%pereighteenmonthcycleforunit1,and2.68%forunit2.Bothhistoricalvaluesarelessthanthe5%sublimationrateusedinsettingtheT/Sminimumiceweight.Basedonthishistoricaldata,thereisreasonableassurancethattheanalysisassumptionsforavailableicemasswillbesatisfied.TherevisiontotheT/S3/4.5.5basisprovidesclarificationthatwatersourcesinadditiontothewaterintheRWSTareconsideredindeterminingthewaterinventoryfortherecirculationsump.ThisclarificationisconsistentwithFSARappendixN,section13.1throughsection13.25,question23,andappendixQ,unit2question212.29.Theanswerstothesequestionsdocumentthatmeltedice, 0
Attachment1toAEP:NRC:0900KPage5RCSinventory,andRWSTinventorywereconsideredascontributingtothevolumeofwaterintherecirculationsump.
0 ATTACHMENT2TOAEP:NRC:0900KCURRENTPAGESMARKED-UPTOREFLECTPROPOSEDCHANGESTOTECHNICALSPECIFICATIONS 00