ML17334B656

Application for Amends to Licenses DPR-58 & DPR-78,changing TSs 3/4.6.5 & 3/4.5.5 to Increase Both Minimum Required Ice Mass Per Ice Basket & Total Minimum Required Ice Mass. Proprietary Summary of Sump Inventory Calculations,Encl

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: ML17333B075 ML17334B656
References
AEP:NRC:0900K, AEP:NRC:900K, NUDOCS 9710150014
Download: ML17334B656 (27)

Text

CATEGORYj.REGUL*TOhOINPORN*TION DISTRIBUTION-TEN-(RIDE)

ACCESSION NBR:9710150014 DOC.DATE:97/10/08NOTARIZED:

YESDOCKET0FACIL:50-315DonaldC.CookNuclearPoeerPlantiUnit1IIndianaM0500031550-316DonaldC.CookNuclearPowerPlantiUnit2IIndianaM05000316AUTH.NAMEAUTHORAFFILIATION FITZPATRICK'.

AmericanElectricPoeerCo.IInc.RECIP.NAMERECIPIENT AFFILIATION DocumentControlBranch(Document ControlDesk)

SUBJECT:

Application foramendstolicensesDPR-58ZcDPR-78IrequestTSs3/4.6.5reiceeeighth3/4.5.5rebasesrefueling eaterstoragetankchange.Proprietary summaryofrecirculation sumpencl.Proprietary infoeithheld.

per10CFR2.790.DISTRIBUTION CODE,'*PDIDCOPIES.RECEIVED:

LTRIENCLlSIZE:+(DTITLE:,Proprietarj RevieeDistribution

-PreOperating License5Operating RNOTES:ERECIPIENTIDCODE/NAME-PD3-3LAHICKMANIJCOPIESLTTREEL111'ECIPIENT IDCODE/NAME PD3-3PDCOPIESLTTRENCL10RINTERNAL:

~CENTER01OGC/HDS21'EXTERNAL:

NRCPDR',CUENNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTRIBUTION LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083TOTALNUMBEROFCOPIESREQUIRED:

LTTR6ENCL 1~~*Ai,l~

IndianaMIchiganPowerCompany500CircleDriveBuchanan, MI491071395 tNOIAMANICHIGANPQWMOctober8,1997AEP:NRC:0900K 10CFR50.90DocketNos.:50-31550-316U.S.NuclearRegulatory Commission ATTN:DocumentControlDeskWashington, D.C.20555Gentlemen:

DonaldC.CookNuclearPlantUnits1and2REQUESTFOREXIGENTTECHNICAL SPECIFICATION AMENDMENT TECHNICAL SPECIFICATION 3/4.6.5ICEWEZGHTANDSURVEILLANCE REQUIREMENT ANDTECHNICAL SPECIFICATION 3/4.5.5BASISREFUELING WATERSTORAGETANKCHANGEPursuantto10CFR50:91(a)(5),

weproposetoamendbothtechnical specification (T/S)3/4.6.5,andtheT/S3/4.6.5and3/4.5.5basisofCookNuclearPlantunits1and2,andrequesttheNRCgrantthisasanexigentamendment.

Thisletterandits.attachments constitute anapplication fortheexigentamendment.

Thisamendment willincreaseboththeminimumrequiredicemasspericebasket,thetotalminimumrequiredicemass,andchangesthebasisfortheT/S.ThechangeintheT/S3/4.5.5basisisconsidered tobeanunreviewed safetyquestion.

Theanalysissupporting thechangeiniceweightconcludes thatbothwaterfromtherefueling waterstoragetank(RWST)andwaterfrommeltedicearerequiredtoprovideanadequatesumpinventory forthelimitingcalculation.

Theuseofwaterfrommeltediceisconsidered areduction inthemarginofsafetyasdefinedintheT/Ss.ThepresentwordingofT/S3/4.5.5basiscanbeinterpreted tomeanthattheonlywaterintherecirculation sumpthatcanbecreditedinthesafetyanalysisisthatfromtheRWST.Attachment 1providesadescription ofthechange,thebackground andreasonforthechange,thejustification forexigentreviewandapproval, thejustification forthechange,andouranalysesconcerning significant hazardsconsiderations.

Attachment 2providesthecurrentT/Spages,marked-up toreflecttheproposedchanges.Attachment 3providestheproposedrevisedT/Spages.Attachment 4providesthedatasupporting thesublimation rates.Attachment 5providesFauskeaAssociates'roprietary summaryoftherecirculation sumpinventory calculation thatsupportstheT/Schange.Attachment 6providesFauske&Associates'ffidavit andjustification forwithholding proprietary information frompublicdisclosure inaccordance with10CFR2.790.Q~p',L-Tk.~l.Lilllllllllllllllllllll)IIIIIIIII'llllll

@'I'7i01500f 4971008PDRADOCK050003i5'OR

$Webelievetheproposedchangeswillnotresultin:1)asignificant changeinthetypesofeffluents orasignificant increaseinthe.amountsofanyeffluents thatmaybereleasedoffsite;or2)asignificant increaseinindividual orcumulative occupational radiation exposure.

U.S.NuclearRegulatory Commission Page2AEP:NRC:0900KThischangeintheminimumrequiredicemassispartoftheresolution ofissuesraisedduringtherecentarchitect engineerdesigninspection atCookNuclearPlant.Therevisedicemassisusedasinputtothecalculation ofrecirculation sumpwatervolumeduringaloss-of-coolant accident.

Asummaryofthelimitingcalculation forsmallbreakloss-of-coolant accidentisprovidedinattachment 5.Thissummaryincludesthesignificant codeinputparameters andthecalculation results.Theinputparameters inattachment 5havebeenreviewedbyourpersonnel, andwehaveconcluded thattheinputparameters accurately reflectthecurrentCookNuclearPlantdesign.Theproposedchangeshavebeenreviewedbytheplantnuclearsafetyreviewcommittee, andwillbereviewedbythenuclearsafetyanddesignreviewcommittee atitsnextregularly scheduled meeting.Incompliance withtherequirements of10CFR50.91(b)(1),copiesofthisletteranditsattachments havebeentransmitted totheMichiganPublicServiceCommission andtheMichiganDepartment ofPublicHealth.Sincerely, pm+E.E.Fitzpatrick VicePresident SWORNTOANDSUBSCRIBED BEFOREMETHISRDAYOF0~~11997Jf("(>NotaryPublicMyCommission ExpiresvbAttachments JANWATSONNOTARYPUHUC,BERRlEN CNNTY,MlMYCOMMSSIONEXPlRES FEB.<0,<999A.A.BlindA.B.BeachMDEQ-DW6cRPDNRCResidentInspector J.R.Padgett ltlpI-ATTACHMENT 6TOAEP:NRC:0900K FAUSKE6cASSOCIATES'FFIDAVIT ANDJUSTIFICATION FORWITHHOLDING PROPRIETARY INFORMATION FROMPUBLICDISCLOSURE 1

STATSOFIL,LINOIS COUNTYOPDUPAGBBeforeme,theundersigned authority, personally appearedRobertH.Henry,who,beingbymedulyswornaccording tolaw,deposesandsaysthatheisauthorized toexecutethisAf6davitonbehalfofPauskeEcAssociates, Inc.,awhollyownedsubsidiary oftheWestinghouse HectricCoqmration

("Westinghouse"

)andthattheaverments offactsetforthinthisAffidavit aretrueandcorrecttothebestofhisknowledge, information, andbelief.RobertE.HenrySeniorVicePresident ProcessSafetyDepartment Sworntoandsubscribed beforemethisP"-'ay,1997OFFICIALggpLHANSlQ(STIANFAUSKEROTARYPU8UC,SgTEQpQIIIQISMYCOMMISS!OM EXPIRES621200$JfotaryPublic (1)IamSeniorVicePresident inchargeoftheProcessSafetyDepartment ofPauske&Associates, Inc.,awhollyownedsubsidiary ofWestinghouse ElectricCorporation andassuch,Ihavebeenspecifically delegated thefunctionofreviewing theproprietary information soughttobewithheldfrompublicdisclosure inconnection withiiuciearpowerplantlicensing, andamauthorized toapplytoitswithholding onbehalfoftheWestinghouse EnergySystemsBusinessUnit.(2)IammaMngthisAffidavit inconformance withtheprovisions of10CFRSection2.790oftheCommission's regulations andinconjunction withtheWestinghouse application forwithholding accompanying thisAffidavit.

(3)IhavepersonalKnowledge ofthecriteriaandprocedures utilizedbytheWestinghouse EnergySystemsBusinessUnitindesignating information asatradesecret,privileged orasconfidential commercial orfinancial information.

(4)Pursuanttotheprovisions ofparagraph (b)(4)ofSection2.790oftheCommission's regulations, thefollowing isfurnished forconsideration bytheCommission indetermining whethertheinformation soughttobcwithheldfrompublicdisclosure shouldbewithheld.

(i)Theinformation soughttobewithheldfrompublicdisclosure isownedandhasbeenheldinconfidence byWestinghouse.

(ii)Theinformation isofatypecustomarily heldinconfidence byWestinghouse andnotcustomarily disclosed tothepublic.Westinghouse hasarationalbasisfordetermining thetypesofinformation customarily heldinconfidence byitand,inthatconnection, utilizesasystemtodetermine whenandwhethertoholdcertaintypesofinformation inconfidence.

Theapplication ofthatsystemandthesubstance ofthatsystemconstitutes Westinghouse policyandprovidestherationalbasisrequired.

2/6 Underthatsystem,information isheldinconfidence ifitfallsinoneormoreofseveraltypes,thereleaseofwhichmightresultinthelossofanexistingorpotential competitive advantage, asfollows:(a)Theinformation revealsthedistinguishing aspectsofaprocess(orcomponent, structure, tool,method,etc.)whereprevention ofitsusebyanyofWestinghouse's competitors withoutlicensefromWestinghouse constitutes acompetitive economicadvantage overothercompanies.

(b)Itconsistsofsupporting data,including testdata,relativetoaprocess(orcomponent, structure, tool,method,etc.),theapplication ofwhichdatasecuresacompetitive economicadvantage, e.g.,byoptimization, orimprovedmarketability.

(c)Itsusebyacompetitor wouldreducehisexpenditure ofresources orimprovehiscompetitive positioninthedesign,manufacture,

shipment, installation, assurance ofquality,orlicensing asimilarproduct.(d)Itrevealscostorpriceinformation, production capacities, budgetlevels,orcommercial strategies ofWestinghouse, itscustomers orsuppliers.

(e)Itrevealsaspectsofpast,present,orfutureWestinghouse orcustomerfundeddevelopment plansandprogramsofpotential coinmercial valuetoWestinghouse.

(f)Itcontainspatentable ideas,forwhichpatentprotection maybedesirable.

(g)ItisnotthepropertyofWestinghouse, butmustbetreatedasproprietary byWestinghouse according toagreements withtheowner,3/6 IThere,aresoundpolicyreasonsbehindtheWestinghouse systemwhichincludethefollowing:

(a)Theuseofsuchinformation byWestinghouse givesWestinghouse acompetitive advantage overitscompetitors.

Itis,therefore, withheldfromdisclosure toprotecttheWestinghouse competitive position.

(b),Itisinformation whichismarketable inmanyways.Theextenttowhichsuchinformation isavailable tocompetitors diminishes theWestinghouse abilitytosell.productsandservicesinvolving theuseoftheinformation.

(c)Usebyourcompetitor wouMputWestinghouse atacompetitive disadvantage byreducinghisexpenditure ofresources atourexpense.(d)Eachcomponent ofproprietary information pertinent, toaparticular competitive advantage ispotentially asvaluableasthetotalcompetitive advantage.

Ifcompetitors acquirecomponent ofproprietary information, anyonecomponent maybethekeytotheentirepuzzle,therebydepriving Westinghouse ofacompetitive advantage.

(e)Unrestricted disclosure wouldjeopardize thepositionofprominence ofVifestinghouse intheworldmarket,andtherebygiveamarketadvantage tothecompetition ofthosecountries.

(f)TheWestinghouse capacitytoinvestcorporate assetsinresearchanddevelopment dependsuponthesuccessinobtaining andmaintaining acompetitive advantage.

(iii)Theinformation isbeingtransmitted totheCommission inconfidence and,undertheprovisions of10CFRSection2.790,itistobereceivedinconfidence bythe4/6 Commission.

(iv)Theinformation soughttobeprotected isnotavialable inpublicsourcesoravailable information hasnotbeenpreviously employedinthesameoriginalmannerormethodtothebestofourknowledge andbelief.(v)Theproprietary information soughttobewithheldinthissubmittal ispresented inSections2and3ofthedmQreportentitled"MAAP4SmallBreakLOCAAnalysesfartheD.C.CookP]ant".Theproprietary information assubmitted forusebyIndianaMichiganPowerCompanyforDonaldC.Cook¹clearPlantUnit1maybeapplicable inotherlicensesubmittals inresponsetocertainNRCrequirements..

Thisinformation ispartofthatwhichwillenableWestinghouse toassistthecustomertoobtainNRCapproval.

Purtherthisinformation hassubstantial commercial valueasfollows:(a)%westinghouse planstoselltheuseofsimilarinformation toitscustomers forpurposesofmeetingNRCrequirements forlicensing documentation.

(b)Westinghouse cansellsupportanddefenseofthetechnology toitscustomers inthelicensing process.Publicdisclosure ofthisproprietary information islikelytocausesubstantial harmtothecompetitive positionofWestinghouse becauseitwouldenhance'the abilityofcompetitor toprovidesimilarmethodologies andlicensing defenseservicesforcommercial powerreactorswithoutcommensurate expenses.

Also,publicdisclosure oftheinformation wouldenableotherstousctheinformation tomeetNRCrequirements forlicensing documentation withoutpurchasing therighttousetheinformation.

5/6 Thedevelopment ofthetechnology described inpartbytheinformation istheresultofapplyingtheresultsofmanyyearsofexperience inanintensive Westinghouse effortandtheexpenditure ofaconsiderable sumofmoney.3norderforcompetitors ofWestinghouse toduplicate thisinformation, similartechnical programswouldhavetobeperformed andasigni6cant manpowereffort,havingthe~uisitetalentandexperience, wouMhavetobeexpandedfordeveloping testingandanalytical methodsandperforming tests.Purtherthedeponentsayethnot.6/6

,97101500>4

~ATTACHMENT 1TOAEP:NRC:0900K DESCRIPTION OFCHANGE,BACKGROUND ANDREASONFORCHANGE/JUSTIFICATION FOREXIGENTREVIEWANDAPPROVAL, JUSTIFICATION FORCHANGEAND10CFR50.92ANALYSES

Attachment 1toAEP:NRC:0900K Page1DescritionofAmendment ReestTechnical specification (T/S)3.6.5.1.d requiresthateachicebasketcontainatleast1220poundsofice,andT/Ssurveillance 4.6.5.1.b.2 requiresaminimumtotaliceweightof2,371,450 poundsforeachunit.ThisrequestforaT/Schangeincreases boththeminimumicebasketweightrequirement andtheminimumtotalweightrequirement:

Also,thebasisfortheT/Sisbeingrevisedtodecreasethequantityassumedforsublimation lossesfrom10%to5%'.T/S3/4.5.5basisisbeingrevisedforclarification.

BackroundandReasonforChaneThisT/Sandsurveillance arecurrently requiredforoperation inmodes1,2,3,and4.Duringaloss-of-coolant accident(LOCA),waterfromseveralsources(e.g.,refueling waterstoragetank(RWST),reactorcoolantsystem(RCS),accumulators, andmeltedice)collectinthelowerregionsofthecontainment, partofwhichactsasasump(i.e.,recirculation sump)fortherecirculation ofwaterthroughthesafetyinjection andcontainment spraysystems.Astheaccidentprogresses, theRWST,theinitialsourceofwaterfortheemergency corecooling(ECCS)andcontainment spraysystems,emptiesandthewaterthathasaccumulated inthelowerregionsofthecontainment isusedasthesourceofwaterforthesafetyinjection andcontainment spraysystems.Thewaterlevelintherecirculation sumpmustbehighenoughtoprovidesufficient netpositivesuctionheadtothepumps,andtopreventvortexing intherecirculation sump.Duringtherecentarchitect engineerinspection conducted atCookNuclearPlant,itwasdetermined that,becauseofinstrument uncertainties, theswitchover totherecirculation modemightoccurbeforeasufficient volumeofRWSTwaterhadbeeninjectedintothecontainment.

This,whenconsidered withourlowercontainment designthatallowssomecontainment sprayflowtobecometrappedinthedeadendedannulusregion,raisedaconcernastowhetherthelimitingvortexing heightrequirements fortheRHRandCTSpumpscouldbemetthroughout thetransient.

Asaresult,evaluations fortransient sumplevelforsmallbreakloss-of-coolant accident(SBLOCA)andlargebreakloss-of-coolant accidentwereperformed.

Thelimitingevaluation istheSBLOCA,duetoitslowerRCSandaccumulator massrelease.Acalculation performed forSBLOCAindicates thatitisnecessary tocreditmoreoftheavailable icecondenser icemassthancurrently listedintheT/S.ThecurrentT/Sandbasisstatements requirethat:T/S3/4.6.5T/S3/4.6.5Eachicebaskethaveatleast1220poundsofice.Theminimumtotalicecondenser iceweightata95%levelofconfidence shallbecalculated usingallicebasketweightsdetermined duringthisweighingprogramandshallnotbelessthan2,371,450 pounds.

Attachment 1toAEP:NRC:0900K Page2T/S3/4.6.5BasisT/S3/4.5.5BasisTheminimumweightfigureof1220poundsoficeperbasketcontainsa10%conservative allowance foricelossthroughsublimation, whichisafactorof10higherthanassumedfortheicecondenser design.ThelimitsonRWSTminimumvolumeandboronconcentration ensurethat:1)sufficient waterisavailable withincontainment topermitrecirculation coolingflowtothecore.Weareproposing tochangetheserequirements to:T/S3/4.6.5Eachicebaskethaveatleast1333poundsofice.T/S3/4.6.5Theminimumtotalicecondenser iceweightata95%levelofconfidence shallbecalculated usingallicebasketweightsdetermined duringthisweighingprogramandshallnotbelessthan2,590,000pounds.T/S3/4.6.5BasisT/S3/4.5.5BasisTheminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservative allowance foricelossthroughsublimation.

Consistent withtheapplicable LOCAanalyses, thelimitsonRWSTminimumvolumeandboronconcentration ensurethat:1)whencombinedwithwaterfrommeltedice,theRCS,andtheaccumulators, sufficientwaterisavailable withincontainment, topermitrecirculation coolingflowtothecore.Justification forExientReviewandAroyalCookNuclearPlantT/Ssrequirethattheicecondenser beinmodes1,2,3,and4.Tomeetthisrequirement, condenser mustcontainsufficienticetocondensethesystemvolumereleasedduringaLOCA,andtoprovideanamountofwatertotherecirculation sumpsothatthewaterfromallsourcesissufficient toenablethe,RHRpumpstofunctionproperly.

operabletheicereactoradequatecombinedandCTSTheamountoficepresently takencreditfor(perbasketandtotal)inourcurrentT/Sminimumiceweightsislessthanwhatisneededtomaintainthesumplevelabove602'0".Basedonamodeltestin1977,waterlevelof602'0"issufficient topreventpumpvortexing atmaximumsafeguards flow.TheproposedchangestotheT/Swilltakecreditformoreoftheavailable icetoprovidereasonable assurance thatsufficient watertomaintain602'0"elevation isachieved.

OnSeptember 18,1997,oursubmittal AEP:NRC:126061 wassenttotheNRC,providing adiscussion oftheactionswearetakingtoaddresstechnical issuesidentified bytherecentlycompleted architect engineerteaminspection.

Weareanticipating thecommencement of

Attachment 1toAEP:NRC:0900K Page3startupactivities inseveralweeks,andrespectfully requesttheNRC'sreviewandapprovalonanexigentbasis.Weunderstand theimpactofsuchanexigentrequest,andrecognize thattheconditions andstatusofCookNuclearPlant'srestartmaychangeinthefuture.We'ntendtokeepthecommission

informed, throughourdailycontactwithourNRRprojectmanager,astothestatusofourrestartschedule.

Justification ForChaneInmodes1,2,3,and4,theicecondenser isrequiredtobeoperable.

Tobeconsidered

operable, theicecondenser mustbecapableofcondensing steam,providing boratedwatertotherecirculation sump,andbecapableofmaintaining itsstructural integrity.

Additionally, becausethewaterfromthemeltedicecombineswithwaterfromtheRWST,theRCS,andtheaccumulators, thetotalamountofwaterfromallsourcesmustnotcausethewaterlevelincontainment toresultinthesubmergence ofequipment requiredtosafelyshutdownthereactor.Thestructural analysisfortheicebasketshasshownthattheywillmaintaintheirstructural integrity ataweightof1877pounds(icebasketplusiceweight).Weadministratively controlicebasketweightsothaticebasketstructural integrity isnotadversely impacted.

Safetyrelatedequipment locatedinsidethecontainment isprotected frombeingsubmerged, sincetheequipment hasnotbeenqualified forsubmergence.

Inmanyinstances, theprotection againstsubmergence isachievedbylocatingtheequipment abovethecalculated flooduplevel.Thefloodupanalysisfortheplantassumedthattheicecondenser contained 3,000,000 poundsofice.TherevisedT/Svalueof2,590,000 poundsoficeislessthanthevalueusedinthefloodupevaluation.

Theminimumrequiredquantityoficehasbeendetermined usinganallowance of5%forsublimation.

Thisisareduction fromthe10%.valueusedinthepresentT/S,andhasbeendetermined onthebasisofhistorical averagechangesinicemass.Usingdatafromthelastthirteenyears,theaveragemeasuredchangeinicemassoveraneighteenmonthperiodwas2.31%forunit1,and2.68%forunit2.Thedatausedtodetermine thesublimation ratesaregiveninattachment 4.T/S3/4'.5basisisbeingrevisedtoclarifythatwatersourcesinadditiontowaterintheRWSTarerequiredtoprovideasufficient quantityofwatertoensurethatthereisnovortexing intherecirculation sump,andthatthereissufficient netpositivesuctionhead.Thecurrentbasiswordingcanbeinterpreted tomeanthatthewaterfromtheRWSTmust,byitself,besufficient tomeet"theserequirements.

Therevisedwordingwillbeconsistent withthecurrentwordinginthebasisofT/S3/4.6.5.7 whereinitisstatedthat,"Theoperability oftheicecondenser floor...drains ensuresthatfollowing aLOCA,thewaterfromthemeltedice...has access...to thesump.This...ensures theavailabili.ty ofthewaterforlongtermcoolingofthereactorduringthepostaccidentphase."BasisForNoSinificantHazardsDetermination 1

Attachment 1toAEP:NRC:0900K Page4Inaccordance with10CFR50.92,theproposedchangesdonotinvolveasignificant hazardsconsideration ifthechangesdonot:involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated; createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated; or3.involveasignificant reduction inamarginofsafety.Criterion 1Thisamendment requestdoesnotinvolveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated.

Thechangeincreases theminimumiceweight'equirements, ensuringthattherewillbesufficient water(i.e.,aminimumsumplevelof602'0")intherecirculation sumpfromthetimeofswitchover untilanequilibrium levelisreached.ThiswillprovideadequatesumplevelfortheRHRandCTSpumpstofunctionproperly, andprovidesufficient flowtomeetaccidentrequirements.

Criterion 2Theproposedchangedoesnotcreatethepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated.

Thischangeincreases therequiredminimumamountoficeintheicecondenser.

Itdoesnotalteranyotherphysicalcharacteristics oftheicebaskets,nordoesitchangetheicecondenser's function.

Noknownfailuremechanisms areintroduced bythischange.Criterion 3Thisproposedchangedoesnotinvolveasignificant reduction inamarginofsafety.Thechangeincreases theminimumheatabsorbing capability oftheicecondenser, andensuresthattherewillbeasufficient quantityofmeltedicetomaintainthedesiredminimumsumplevelof602'0"fromthetimeofswitchover.

ThiswillprovideanadequatesumplevelfortheRHRandCTSpumpsfollowing switchover totherecirculation phase.Thereduction intheallowance for.icesublimation doesnotsignificantly reducethemarginofsafety.Theoriginalallowance wasconservatively estimated tobetentimesthedesignvalue.Atthetimethisallowance wasmade,therewasnodatafordetermining theactualsublimation rate.Datatakensince1984hasshownthattheaveragemeasuredsublimation rateis2.31%pereighteenmonthcycleforunit1,and2.68%forunit2.Bothhistorical valuesarelessthanthe5%sublimation rateusedinsettingtheT/Sminimumiceweight.Basedonthishistorical data,thereisreasonable assurance thattheanalysisassumptions foravailable icemasswillbesatisfied.

TherevisiontotheT/S3/4.5.5basisprovidesclarification thatwatersourcesinadditiontothewaterintheRWSTareconsidered indetermining thewaterinventory fortherecirculation sump.Thisclarification isconsistent withFSARappendixN,section13.1throughsection13.25,question23,andappendixQ,unit2question212.29.Theanswerstothesequestions documentthatmeltedice, 0

Attachment 1toAEP:NRC:0900K Page5RCSinventory, andRWSTinventory wereconsidered ascontributing tothevolumeofwaterintherecirculation sump.

0 ATTACHMENT 2TOAEP:NRC:0900K CURRENTPAGESMARKED-UP TOREFLECTPROPOSEDCHANGESTOTECHNICAL SPECIFICATIONS 00