ML17212A852

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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 NextEra Energy icon.png
Issue date: 09/28/1981
From:
FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17212A851 List:
References
NUDOCS 8110050210
Download: ML17212A852 (3)


Text

3/4.1REACTIVITY CONTROLSYSTEMSBASES3/4.1.1BORATIONCONTROL3/4.1.1.1 and3/4.1.1.2 SHUTDOWNMARGINAsufficient SHUTDOWNMARGIN,ensuresthat1)thereactorcanbemadesubcritical fromalloperating conditions, 2)thereactivity transients associated withpostulated accidentconditions arecontrollable withinacceptable limits,and3)thereactorwillbemaintained sufficiently subcritical toprecludeinadvertent criticality intheshutdowncondition.

SHUTDOWNMARGINrequirements varythroughout corelifeasafunctionoffueldepletion, RCSboronconcentration, andRCSTaThemostrestrictive condition occursatEOL,withTaatnoloadoiIerating temperature, andisassociated withapostulated steamlinebreakaccidentandresulting uncontrolled RCScooldown.

Intheanalysisofthisaccident, aminimum'HUTDOWNMARGINof3.3//A,k/kisrequiredtocontrolthereactivity transient.

Accordingly, theSHUTDOWNMARGINrequiredbySpecification 3.1.1.1isbaseduponthislimitingcondition andisconsistent withFSARaccidentanalysisassumptions.

Forearlierperiodsduringthefuelcycle,thisvalueisconservative.

WithTv<200Fthereactivity transient resulting fromaborondilutioneventwitk3partially drainedReactorCoolantSystemrequiresa2$hk/kSHUTDOWNMARGINandrestrictions onchargingpumpooeration toprovideadequateprotection.

A2$ak/kSHUTDOWNMARGINis1.0gak/kconservative forMode5operation withtotalRCSvolumepresent,howeverLCO3.1.1.2iswrittenconservatively forsimplicity.

3/4.1.1.3 BORONDILUTIONANDADDITIONAminimumflowrateofatleast3000GPMprovidesadequatemixing,preventsstratification andensuresthatreactivity changeswillbegradualduringboronconcentration changesintheReactorCoolantSystem.Aflowrateofatleast3000GPMwillcirculate anequivalent ReactorCoolantSystemvolumeof11,400cubicfeetinapproximately 26minutes.Thereactivity changerateassociated withboronconcentration changeswillbewithinthecapability foroperatorrecognition andcontrol.3/4.1.1.4 MODERATOR TEMPERATURE COEFFICIENT

~MTCThelimitingvaluesassumedfortheMTCusedintheaccidentandtransient analyseswere+0.5x10ak/k/'FforTHERMALPOWERlevels<7(5ofRATEDTWERliALPOWER,+0.2x20ck/k/'FforTERNALPOWERlevels>7OXofRATEDTHERMALand-2."2x10~k/k/'FatRATEDTHERMALPOWER.Therefore, theselimitingvaluesareincludedinthisspecification.

Determination ofMTCatthespecified conditions ensuresthatthemaximumpositiveand/ornegativevalUesoftheETCwillnotexceedthelimitingvalues.8l10050210810928&PDRADOCK05000335PPDRyST.LUCIE-UNIT183/41-19-28-81 REACTIVITY CONTROLSYSTEMSSHUTDOWNMARGIN-T('00FLIMITINGCONDITION FOROPERATION 3.1.1.2TheSHUTDOWNMARGINshallbe:>2.0%ak/k,andinadditionwiththeReactorCoolantSystemdrainedbelowthehotlegcenterline, onechargingpumpshallberenderedinoperable.*

APPLICABILITY:

Mode5ACTION:IftheSHUTDOWNMARGINrequirements cannotbemet,immediately initiateandcontinueborationat>40gpmof1720ppmboronorequivalent untiltherequiredSHUTDOWNMARGINisrestored.

SURVEILLANCE REUIREMENTS 4.1.1.2TheSHUTDOWNMARGINrequirements ofSpecification 3.1.1.2shallbe'etermined:

a.Withinonehourafterdetection ofaninoperable CEA(s)andatleastonceper12hoursthereafter whiletheCEA(s)isinoperable.

Iftheinoperable CEAisimmovable oruntrippable, theaboverequiredSHUTDOWNMARGINshallbeincreased byanamountatleastequaltothewithdrawn worthoftheimmovable oruntrippable CEA(s).b.Atleastonceper24hoursbyconsideration ofthefollowing factors:.1.Reactorcoolantsystemboronconcentration, 2.CEAposition, 3.Reactorcoolantsystemaveragetemperature, 4.Fuelburnupbasedongrossthermalenergygeneration, 5.Xenonconcentration, and6.Samariumconcentration.

c.Atleastonceper24hours,whentheReactorCoolantSytemis,drainedbelowthehotlegcenterline, byconsideration ofthefactorsin4.1.1.2.b andbyverifying atleastonechargingpumpisrenderedinoperable.*

  • Breakerracked-out.

ST.LUCIE-UNIT13/41-39-28-81 TO:DISTRIBUTION FROP'I:ROBERTE.UFIRIGGO:H.L.Allen$U.B.Derrickson H.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.WoodyDocumentary PilesNRCCORRESPONDENCE ST.LUCIEUN1'I'S1R2PSL1:PSL2:A.rU.13aileyR.R.JenningsJ.ICruminsN.RoosN.T.NeemsC.M.NethyQ.C.Supervisor StevenA.Elrod(NRC)B.J.HscueGeo.CromwellN.T.WeemsPTP3/4:H.H.YaegerPT.PIERCEOFC:H.Schindehette STUARTOFC: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)