ML17212A852

Proposed Revisions to Tech Spec Pages B3/4 1-1 & 3/4 1-3 Adding Limitations to Address Mode 5 Operation W/Rcs Partially Drained

ML17212A852
Person / Time
Site:	Saint Lucie
Issue date:	09/28/1981
From:	FLORIDA POWER & LIGHT CO.
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Shared Package
ML17212A851	List: ML17212A850 ML17212A852
References
NUDOCS 8110050210
Download: ML17212A852 (3)

Text

3/4.1REACTIVITYCONTROLSYSTEMSBASES3/4.1.1BORATIONCONTROL3/4.1.1.1and3/4.1.1.2SHUTDOWNMARGINAsufficientSHUTDOWNMARGIN,ensuresthat1)thereactorcanbemadesubcriticalfromalloperatingconditions,2)thereactivitytransientsassociatedwithpostulatedaccidentconditionsarecontrollablewithinacceptablelimits,and3)thereactorwillbemaintainedsufficientlysubcriticaltoprecludeinadvertentcriticalityintheshutdowncondition.SHUTDOWNMARGINrequirementsvarythroughoutcorelifeasafunctionoffueldepletion,RCSboronconcentration,andRCSTaThemostrestrictiveconditionoccursatEOL,withTaatnoloadoiIeratingtemperature,andisassociatedwithapostulatedsteamlinebreakaccidentandresultinguncontrolledRCScooldown.Intheanalysisofthisaccident,aminimum'HUTDOWNMARGINof3.3//A,k/kisrequiredtocontrolthereactivitytransient.Accordingly,theSHUTDOWNMARGINrequiredbySpecification3.1.1.1isbaseduponthislimitingconditionandisconsistentwithFSARaccidentanalysisassumptions.Forearlierperiodsduringthefuelcycle,thisvalueisconservative.WithTv<200Fthereactivitytransientresultingfromaborondilutioneventwitk3partiallydrainedReactorCoolantSystemrequiresa2$hk/kSHUTDOWNMARGINandrestrictionsonchargingpumpooerationtoprovideadequateprotection.A2$ak/kSHUTDOWNMARGINis1.0gak/kconservativeforMode5operationwithtotalRCSvolumepresent,howeverLCO3.1.1.2iswrittenconservativelyforsimplicity.3/4.1.1.3BORONDILUTIONANDADDITIONAminimumflowrateofatleast3000GPMprovidesadequatemixing,preventsstratificationandensuresthatreactivitychangeswillbegradualduringboronconcentrationchangesintheReactorCoolantSystem.Aflowrateofatleast3000GPMwillcirculateanequivalentReactorCoolantSystemvolumeof11,400cubicfeetinapproximately26minutes.Thereactivitychangerateassociatedwithboronconcentrationchangeswillbewithinthecapabilityforoperatorrecognitionandcontrol.3/4.1.1.4MODERATORTEMPERATURECOEFFICIENT~MTCThelimitingvaluesassumedfortheMTCusedintheaccidentandtransientanalyseswere+0.5x10ak/k/'FforTHERMALPOWERlevels<7(5ofRATEDTWERliALPOWER,+0.2x20ck/k/'FforTERNALPOWERlevels>7OXofRATEDTHERMALand-2."2x10~k/k/'FatRATEDTHERMALPOWER.Therefore,theselimitingvaluesareincludedinthisspecification.DeterminationofMTCatthespecifiedconditionsensuresthatthemaximumpositiveand/ornegativevalUesoftheETCwillnotexceedthelimitingvalues.8l10050210810928&PDRADOCK05000335PPDRyST.LUCIE-UNIT183/41-19-28-81 REACTIVITYCONTROLSYSTEMSSHUTDOWNMARGIN-T('00FLIMITINGCONDITIONFOROPERATION3.1.1.2TheSHUTDOWNMARGINshallbe:>2.0%ak/k,andinadditionwiththeReactorCoolantSystemdrainedbelowthehotlegcenterline,onechargingpumpshallberenderedinoperable.*APPLICABILITY:Mode5ACTION:IftheSHUTDOWNMARGINrequirementscannotbemet,immediatelyinitiateandcontinueborationat>40gpmof1720ppmboronorequivalentuntiltherequiredSHUTDOWNMARGINisrestored.SURVEILLANCEREUIREMENTS4.1.1.2TheSHUTDOWNMARGINrequirementsofSpecification3.1.1.2shallbe'etermined:a.WithinonehourafterdetectionofaninoperableCEA(s)andatleastonceper12hoursthereafterwhiletheCEA(s)isinoperable.IftheinoperableCEAisimmovableoruntrippable,theaboverequiredSHUTDOWNMARGINshallbeincreasedbyanamountatleastequaltothewithdrawnworthoftheimmovableoruntrippableCEA(s).b.Atleastonceper24hoursbyconsiderationofthefollowingfactors:.1.Reactorcoolantsystemboronconcentration,2.CEAposition,3.Reactorcoolantsystemaveragetemperature,4.Fuelburnupbasedongrossthermalenergygeneration,5.Xenonconcentration,and6.Samariumconcentration.c.Atleastonceper24hours,whentheReactorCoolantSytemis,drainedbelowthehotlegcenterline,byconsiderationofthefactorsin4.1.1.2.bandbyverifyingatleastonechargingpumpisrenderedinoperable.**Breakerracked-out.ST.LUCIE-UNIT13/41-39-28-81 TO:DISTRIBUTIONFROP'I:ROBERTE.UFIRIGGO:H.L.Allen$U.B.DerricksonH.W.DotsonP.G.PluggerJ.FI.FrancisF.P.GreenIC.N.FIarrisC.S.KentN.B.LeeJ.E.MoabaH.N.PaduanoA.D.SchmidtA.H.SiebeD.R.StoneJ.R.TomontoJ.Vl.NilliamsC.O.WoodyDocumentaryPilesNRCCORRESPONDENCEST.LUCIEUN1'I'S1R2PSL1:PSL2:A.rU.13aileyR.R.JenningsJ.ICruminsN.RoosN.T.NeemsC.M.NethyQ.C.SupervisorStevenA.Elrod(NRC)B.J.HscueGeo.CromwellN.T.WeemsPTP3/4:H.H.YaegerPT.PIERCEOFC:H.SchindehetteSTUARTOFC:GeneVanCurenVJ.PALMBCH.OFC:T.R.MoffetOTHHR:NormanColl(SteelHector8cDavis)R.R.Mills(Combustion-PSLI)J.C.ibioulton(Combustion-PSL2)HaroldReis,Esq.(Lowenstein)LeoTsal<iris(Hbasco)M.P.IIorrell(Eoasco)