ML13217A054

Palo Verde, Units 1, 2, and 3, Enclosure 1 - Technical Specifications Bases, Revision 58

ML13217A054
Person / Time
Site:	Palo Verde
Issue date:	07/03/2013
From:	Stephenson C J Arizona Public Service Co
To:	Office of Nuclear Reactor Regulation
References
102-06731-TNW/RKR/CJS
Download: ML13217A054 (26)

Text

PVNGSTechnical Specification Bases(TSBases)Revision58Replacement PagesandInsertion Instructions Thefollowing LDCRsareincludedinthischange:LDCR11-B002reflectschangesapprovedbyNRCLicenseAmendment 191,datedApril11,2013,relatedtoTSBasesSection3.7.4,Atmospheric DumpValves(ADVs),thatrequiresfourADVlinesbeOPERABLEwheninModes1,2,3,andinMode4whenthesteamgenerators arebeingusedforheatremoval.RelatedLDCR07-R002removessimilarrequirements forADVoperability thathadbeenincludedintheTechnical Requirements Manual(TRM)asaninterimaction,untilthelicenseamendment wasapproved.

LDCR12-B006clarified TSBasesSections3.4.8,RCSLoops-MODE5,LoopsNotFilled,and3.9.5,SDCandCoolantCirculation

-LowWaterLevel,toindicatethatContainment Spray(CS)pumpsarenottobeusedfornormaloperations ifthewaterlevelisatorbelowthetopofthehot-legpipe(103'-1")duetoconcernsofpotential airentrainment andgasbindingoftheCSpump.TheLDCRalsoupdatedtheReference sectionoftheBasesforeachspecification.

Instructions RemovePaqe:InsertNewPaqe:CoverPageCoverPageListofEffective PagesListofEffective Pages1/2through7/81/2through9/BlankB3.4.8-1B3.4.8-2B3.4.8-1/B3.4.8-2B3.4.8-3BlankB3.4.8-3/B3.4.8-4B3.7.4-1B3.7.4-2B3.7.4-1/B3.7.4-2throughthroughB3.7.4-5BlankB3.7.4-5/B3.7.4-6B3.9.5-1B3.9.5-2B3.9.5-1/B3.9.5-2B3.9.5-3B3.9.5-4B3.9.5-3/B3.9.5-4 PVNGSPaloVerdeNuclearGenerating StationUnits1,2,and3Technical Sp""eclficatlonBasesRevision58July03,2013-_-_.-¢'e_'_'enson o,g,t0,,.s,goe0byS,o..

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IDN:cn=Stephenson, CarlJ(ZO5778)

Reason:Iattesttotheaccuracyandintegrity ofCarlJ(Z05778) th,,_.......Date:20!3.06.2809:16:17-07'00' TECHNICAL SPECIFICATION BASESLISTOFEFFECTIVE PAGESPageRev.PageRevNo.No.No.No.B21i-i0B313-20B21i-20B313-30B21i-337B313-40B21i-421B313-50B21i-554B313-656B212-I0B314-i0B212-231B314-231B212-30B314-30B212-454B314-40B30-i49B314-50B30-20B315-i0B30-30B315-252B30-40B315-352B30-542B315-452B30-648B315-552B30-748B315-652B30-842B315-752B30-942B315-852B30-i042B315-952B30-ii42B315-1056B30-1242B315-1156B30-1342B315-1256B30-1449B316-i0B30-1550B316-246B30-1650B316-342B30-1750B316-442B30-1849B316-556B30-1949B316-646B30-2049B317-i57B30-2149B317-20B30-2249B317-353B31i-I28B317-448B31i-20B317-525B31i-343B317-60B31i-443B317-70B31I-527B317-856B31i-656B317-956B312-I28B318-i52B312-20B318-252B312-343B318-352B312-428B318-452B312-50B318-556B312-643B319-i0B312-712B319-20B312-847B319-30B312-956B319-40B313-I0B319-556PALOVERDEUNITSi,2,AND31Revision58July03,2013 TECHNICAL SPECIFICATION BASESLISTOFEFFECTIVE 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PAGESPageRev.PageRevNo.No.No.No.B389-80B389-90B389-1056B389-1151B38i0-I0B3810-221B3810-348B3810-456B39I-i34Corrected B391-20B39i-30B391-456B392-148B392-215B392-356B392-456B393-118B393-219B393-327B393-419B393-556B.393-656B394-i0B394-254B394-30B394-456B395-i0B395-258B395-358B395-458B396-i0B396-20B396-356B397-i0B397-20B397-356PALOVERDEUNITSI,2,AND39Revision58July03,2013 Thispageintentionally blank RCSLoops-MODE5,LoopsNotFilledB3.4.8B3.4REACTORCOOLANTSYSTEM(RCS)B3.4.8RCSLoops-MODE5,LoopsNotFilledBASESBACKGROUND InMODE5withtheRCSloopsnotfilled,theprimaryfunctionofthereactorcoolantistheremovalofdecayheatandtransferofthisheattotheShutdownCooling(SDC)heatexchangers

.TheSteamGenerators (SGs)arenotavailable asaheatsinkwhentheloopsarenotfilled.Thesecondary functionofthereactorcoolantistoactasacarrierforthesolubleneutronpoison,boricacid.InMODE5withloopsnotfilled,onlytheSDCSystemcanbeusedforcoolantcirculation

.Thenumberoftrainsinoperation canvarytosuittheoperational needs.TheintentofthisLCOistoprovideforcedflowfromatleastoneSDCtrainfordecayheatremovalandtransport andtorequirethattwopathsbeavailable toprovideredundancy forheatremoval.APPLICABLE InMODE5,RCScirculation isconsidered indetermining SAFETYANALYSESthetimeavailable formitigation oftheaccidental borondilutionevent.TheSDCtrainsprovidethiscirculation

.TheflowprovidedbyoneSDCtrainisadequatefordecayheatremovalandforboronmixing.RCSloops-MODE5(loopsnotfilled)havebeenidentified in10CFR50.36(c)(2)(ii) asimportant contributors toriskreduction

.LCOThepurposeofthisLCOistorequireaminimumoftwoSDCtrainsbeOPERABLEandoneofthesetrainsbeinoperation

.AnOPERABLEtrainisonethatiscapableoftransferring heatfromthereactorcoolantatacontrolled rate.HeatcannotberemovedviatheSDCSystemunlessforcedflowisused.AminimumofonerunningSDCpumpmeetstheLCOrequirement foronetraininoperation

.Anadditional SDCtrainisrequiredtobeOPERABLEtomeetthesinglefailurecriterion

.(continued)

PALOVERDEUNITS1,2,3B3.4.8-1REVISION0 RCSLoops-MODE5,LoopsNotFilledB3.4.8BASES(continued)

LCONote1permitsallSDCpumpstobede-energized

_1hourper(continued) 8hourperiod.Thecircumstances forstoppingbothSDCpumpsaretobelimitedtosituations whentheoutagetimeisshortandthecoreoutlettemperature ismaintained

>IO°Fbelowsaturation temperature

.The10degreesFisconsidered theactualvalueofthenecessary difference betweenRCScoreoutlettemperature andthesaturation temperature associated withRCSpressuretobemaintained duringthetimethepumpswouldbede-energized

.Theinstrument errorassociated withdetermining thisdifference islessthan10degreesF.(Therearenospecialrestrictions forinstrumentation use.)Therefore, theindicated valueofthedifference betweenRCScoreoutlettemperature andthesaturation temperature associated withRCSpressuremustbegreaterthanorequaltoi20degreesFinordertousetheprovisions oftheNoteallowingthepumpstobede-energized

,(Ref.1)TheNoteprohibits borondilutionordrainingoperations whenSDCforcedflowisstopped.Note2allowsoneSDCtraintobeinoperable foraperiodof2hoursprovidedthattheothertrainisOPERABLEandinoperation

.Thispermitsperiodicsurveillance teststobeperformed ontheinoperable trainduringtheonlytimewhenthesetestsaresafeandpossible.AnOPERABLESDCtrainiscomposedofanOPERABLESDCpump(CSorLPSI)capableofproviding flowtotheSDCheatexchanger forheatremoval.SDCpumpsareOPERABLEiftheyarecapableofbeingpoweredandareabletoprovideflow,ifrequired.NotethattheCSpumpsshallnotbeusedfornormaloperations ifthewaterlevelisatorbelowthetopofthehot-legpipe(103'1")duetoconcernsofpotential airentrainment andgasbindingoftheCSpump(Ref,2).APPLICABILITY InMODE5withloopsnotfilled,thisLCOrequirescoreheatremovalandcoolantcirculation bytheSDCSystem.Operation inotherMODESiscoveredby:LCO3.4.4,"RCSLoops-MODES 1and2";LCO3.4.5,"RCSLoops-MODE3";LCO3.4.6,"RCSLoops-MODE4";LCO3.4,7,"RCSLoops-MODE5,LoopsFilled";LCO3.9.4,"Shutdown Cooling(SDC)andCoolantCirculation

-HighWaterLevel"(MODE6);and(continued)

PALOVERDEUNITS1,2,3B3.4.8-2REVISION58 RCSLoops-MODE5,LoopsNotFilledB3,4.8BASES(continued)

APPLICABILITY LCO3.9.5,"Shutdown Cooling(SDC)andCoolant(continued)

Circulation

-LowWaterLevel"(MODE6),ACTIONSA.IIfaSDCtrainisinoperable, redundancy forheatremovalislost.Actionmustbeinitiated immediately torestoreasecondtraintoOPERABLEstatus.TheCompletion Timereflectstheimportance ofmaintaining theavailability oftwopathsforheatremoval.B.1andB.2IfnoSDCtrainisOPERABLEorinoperation, exceptasprovidedinNOTEI,alloperations involving thereduction ofRCSboronconcentration mustbesuspended

.ActiontorestoreoneSDCtraintoOPERABLEstatusandoperation mustbeinitiated immediately

.Borondilutionrequiresforcedcirculation forpropermixingandthemargintocriticality mustnotbereducedinthistypeofoperation

.Theimmediate Completion Timereflectstheimportance ofmaintaining operation fordecayheatremoval.SURVEILLANCE SR3.4.8.1REQUIREMENTS ThisSRrequiresverification thatoneSDCtrainisinoperation andcirculating reactorcoolantataflowrateofgreaterthanorequalto3780gpm.Verification includesflowrate,temperature, orpumpstatusmonitoring, whichhelpensurethatforcedflowisproviding decayheatremoval.TheSurveillance Frequency iscontrolled undertheSurveillance Frequency ControlProgram.SR3.4.8.2Verification thattherequirednumberoftrainsareOPERABLEensuresthatredundant pathsforheatremovalareavailable andthatanadditional traincanbeplacedinoperation, ifneeded,tomaintaindecayheatremovalandreactorcoolantcirculation

.Verification isperformed byverifying properbreakeralignment andindicated poweravailable totherequiredpumps.TheSurveillance Frequency iscontrolled undertheSurveillance Frequency ControlProgram.(continued)

PALOVERDEUNITS1,2,3B3.4.8-3REVISION58 RCSLoops-MODE5,LoopsNotFilledB3.4.8BASES(continued)

REFERENCES 1.PVNGSCalculation 13-JC-SH-0200, Section2.9.2.PVNGSCalculation 13-MC-SI-0250, AppendixC.PALOVERDEUNITS1,2,3B3.4.8-4REVISION58 ADVsB3,7.4B3.7PLANTSYSTEMSB3.7,4Atmospheric DumpValves(ADVs)BASESBACKGROUND TheADVsprovideasafetygrademethodforcoolingtheunittoShutdownCooling(SDC)Systementryconditions, shouldthepreferred heatsinkviatheSteamBypassControlSystem(SBCS)tothecondenser and/oratmosphere notbeavailable

,asdiscussed intheUFSAR,Section10.3(Ref.1).TheADVshavethecapacitytoachieveandmaintainsafeshutdownconditions following designbasisaccidents involving alossofoffsitepowerand/orclosureoftheMainSteamIsolation Valves(MSIVs)following receiptofaMainSteamIsolation Signal(MSIS).Thisisdoneinconjunction withtheAuxiliary Feedwater Systemproviding coolingwaterfromtheCondensate StorageTank(CST).TheADVsmayalsoberequiredtomeetthedesigncooldownrateduringanormalcooldown.FourADVlinesareprovided.EachADVlineconsistsofonenormallyclosedADVandanassociated, normallyopenblockvalve.TwoADVlinespersteamgenerator arerequiredtomeetthesinglefailureassumptions following adesignbasisaccidentthatmayrenderonesteamgenerator (SG)unavailable forheatremoval.TheADVblockvalvespermittestingoftheADVswhileaunitisatpower.Thesafetyanalyses, however,donotcreditblockvalveoperation asameansofisolation ofafailedopenADV.TheADVsareequippedwithpneumatic controllers topermitcontrolofthecooldownrate.TheADVsareprovidedwithapressurized gassupplyofbottlednitrogenthat,onalossofpressureinthenormalinstrument airsupply,automatically suppliesnitrogentooperatetheADVs.Thenitrogensupplyissizedtoprovidesufficient pressurized gastooperatetheADVsforthetimerequiredforReactorCoolantSystem(RCS)cooldowntotheShutdownCooling(SDC)Systementryconditions, asdescribed inUFSARAppendix5C,"NaturalCirculation CooldownAnalysis."

TheAppendix5Canalysisisbasedontheassumptions andconditions intheNRC'sBranchTechnical Position(BTP)RSB5-1,"DesignRequirements oftheResidualHeatRemovalSystem."RSB5-Iisanattachment (continued)

PALOVERDEUNITS1,2,3B3.7.4-1REVISION58 ADVsB3.7.4BASESBACKGROUND (continued) toStandardReviewPlan(SRP)5.4.7,"Residual HeatRemoval(RHR)System,"andidentifies RHRSystemrequirements thatensureconformance withGeneralDesignCriteria(GDC)34,"Residual HeatRemoval."ThePVNGSRSB5-1cooldownscenariodescribed inUFSARAppendix5Cisbasedonanaturalcirculation cooldownwithbothsteamgenerators (SGs)available, usingsafety-grade equipment, assumingalossofoffsitepower,alimitingsinglefailure(assumedtobeadieselgenerator failure),

andwithminimaloperatoractionsoutsidethecontrolroom,asapprovedbytheNRC.TheRSB5-1cooldowndurationwasestablished duringactualtestingperformed inJanuary1986,andwasconfirmed throughsubsequent analysestoaddresssteamgenerator replacement andpoweruprates.Adescription oftheADVsisfoundinReference 1.TheADVsrequirebothDirectCurrent(DC)sourcesandclassAlternating Current(AC)instrument powertobeconsidered OPERABLE.Inaddition, non-safety relatedhandwheelsareprovidedforlocalmanualoperations althoughhandwheelsarenotrequiredforADVOPERABILITY orcreditedintheaccidentanalysis.APPLICABLE ThedesignbasisoftheADVsisestablished bytheSAFETYANALYSEScapability tocooltheunittoSDCSystementryconditions

.Thedesignmustalsoaccommodate crediblesinglefailuresthatmayrenderasmanyastwoADVs(i.e.,oneoneachsteamgenerator) incapable ofopeningondemand.ThisdesignisadequatetocooltheunittoSDCSystementryconditions withonlyoneADVandoneSG,utilizing thecoolingwatersupplyavailable intheCST.Cooldownscenarios usingasingleADVmayrequireacombination oftheavailable nitrogensupplyandlocalmanualoperation orotheractions.Alternatives forcooldownandforADVoperation beyondtheRSB5-1scenariohavebeenevaluated usingprobabilistic riskanalysis(PRA)aspartoftheresolution ofUnresolved SafetyIssue(USI)A-45,"Shutdown DecayHeatRemovalRequirements

."USIA-45wassubsumedintotheIndividual PlantExamination (IPE)whichusedPRAtechniques andwassubmitted totheNRCinresponsetoGenericLetter88-20.TheIPEconsidered variousoperatoractionsandtheuseofnon-safety relatedequipment, andconcluded thattherearenosignificant heatremovalvulnerabilities atPVNGS.(continued)

PALOVERDEUNITS1,2,3B3.7.4-2REVISION58 ADVsB3.7.4BASESAPPLICABLE SAFETYANALYSESOperatoractionstolocallyoperatetheADVsarenotcredited(continued) intheUFSARChapter15accidentanalysesbutaredescribed intheEOPs;non-safety relatedequipment suchasthesupplemental nitrogensupplycouldalsobeusedduringextendedcooldownsituations

.ThedesignbasisaccidentanalysesalsoaccountforasinglefailurethatmayrenderoneADVincapable ofbeingclosedremotely, afteritisopenedbycontrolroomoperators

.Thistypeofpostulated failureyieldsmoreadverseradiological consequences forcertainanalyses, becauseitcreatesapathwayforradioisotope discharges totheenvironment

.Foraccidentmitigation thesafetyanalysesdonotcreditisolation ofafailedopenADVbyeitherlocalmanualhandwheeloperation orclosureofitsassociated blockvalve.ThesafetyanalysesintheUFSARassumethatplantoperators willusetheADVstocooldownanaffectedunittoSDCSystementryconditions, following accidents accompanied byalossofoffsitepowerand/orclosureoftheMSIVs.Initiation ofoperatoractionistypically assumedtooccur30minutesfollowing theinitiation ofanevent;however,toconservatively boundmaximumpotential doseconsequences forSteamGenerator TubeRupture(SGTR)events,initiation ofthisoperatoractionisassumedtooccurtwominutesfollowing reactortrip.Priortotheoperatoraction,theMainSteamSafetyValves(MSSVs)arecreditedintheanalysestomaintainSGpressureandtemperature neartheMSSVsetpoints

.ThelimitingdesignbasiseventfornitrogensupplycapacityistheRSB5-1naturalcirculation cooldownscenariodescribed above.Thisscenarioincludesaninitialperiodof4hoursathotstandbyconditions followedbynaturalcirculation cooldownfor9.3hoursuntilSDCentryconditions areachieved.EachADVisrequiredtohaveanitrogensupplythatsupportsADVoperation foratotalof13.3hours,Limitingdesignbasisaccidents withrespecttoRCSheatremovalandADVsteamflowcapacityincludethosethatmayrenderoneSGunavailable, withacoincident lossofoffsitepowerandasingleactivecomponent failure(i.e.,mainsteamlinebreaksupstreamoftheMSIVs,andfeedwaterline breaks).(continued)

PALOVERDEUNITS1,2,3B3.7.4-3REVISION58 ADVsB3.7.4BASESAPPLICABLE SAFETYANALYSESThelimitingdesignbasiseventwithrespecttooffsite(continued) radiological consequences isaSGTRwithacoincident lossofoffsitepower,acoincident RCSiodinespike,andasinglefailedopenADVontheaffectedSG(SGTRLOPSF)

.Todetermine boundingradiological consequences, anADVisassumedtostickopenduringoperatoractionthatoccurstwominutesaftertrip,andremainsopenforthedurationofthecooldown.ForthisSGTRLOPSF case,plantoperators willdirectauxiliary feedwater flowtotheaffectedSGaftertheaccidenthasoccurred.ThesteamreleasedthroughtheADVsiscontaminated, however,becauseofprimary-to-secondary leakagethattransports radioisotopes fromtheRCStotheSG.TheADVssatisfyCriterion 3of10CFR50.36(c)(2)(ii)

.LCOFourADVlinesarerequiredtobeOPERABLE, twooneachSGtoensureadesignbasisaccidentthatrendersoneSGunavailable forheatremoval(incombination withacoincident lossofoffsitepowerandasingleactivecomponent failure)wouldnotpreventcontrolroomoperators fromremotelyopeninganADVontheunaffected SG.FailuretomeettheLCOcanresultinaninability tocooltheaffectedunittoSDCSystementryconditions whentheSBCSisunavailable

.AnADVisconsidered OPERABLEwhenitiscapableofproviding acontrolled reliefofthemainsteamflow,andiscapableoffullyopeningandclosingondemand.IInMODES1,2,and3,andinMODE4,whenaSGisbeingAPPLICABILITY relieduponforheatremoval,theADVsarerequiredtobeOPERABLE.InMODES5and6,thereisinsufficient heatavailable toproducesteamthatcouldbereleasedthroughtheADVs,anddesignbasisaccidents suchasmainsteamlinebreaks,feedwater linebreaks,andSGTRsarenotcredibleevents.(continued)

PALOVERDEUNITS1,2,3B3.7.4-4REVISION58 BASESACTIONSA.1Thecondition forthisACTIONismodifiedbyaNotethatstatesseparateCondition entryisallowedforeachSG.Thisisacceptable becauseonlyoneSGisrequiredforRCSheatremovalafteradesignbasisaccident, andbecausethisCondition providestheappropriate RequiredActionandCompletion Timeforoneinoperable ADVlineoneachSG.WithoneADVlineonaSGinoperable, actionmustbetakentorestorethatADVlinetoOPERABLEstatuswithin7daystomeettheLCOforeachSGthathasenteredthisCondition

.The7-dayCompletion Timetakesintoconsideration theredundant capability affordedbytheremaining OPERABLEADVlines,thesafetygradeMSSVs,andthenon-safety gradebackupoftheSBCS.B.1WithtwoormoreADVlinesinoperable withbothADVlinesinoperable ononeormoreSGs,actionmustbetakentorestoreoneADVlineoneachSGtoOPERABLEstatuswithin24hours.The24hourCompletion Timeisreasonable torepairinoperable ADVlines,basedontheavailability oftheSteamBypassControlSystemandMSSVs,andthelowprobability ofaneventoccurring duringthisperiodthatrequirestheADVIines.NOTE:EntryintoCondition BforallfourADVlinessimultaneously inoperable isnotintendedforvoluntary removalofredundant systemsorcomponents fromserviceinlieuofotheralternatives thatwouldnotresultinredundant systemsorcomponents beinginoperable

.(continued)

PALOVERDEUNITS1,2,3B3.7.4-5REVISION58 ADVsB3.7.4BASESACTIONSC.1andC.2(continued)

IftheADVlinescannotberestoredtoOPERABLEstatuswithintheassociated Completion Time,theunitmustbeplacedinaMODEinwhichtheLCOdoesnotapply.Toachievethisstatus,theunitmustbeplacedinatleastMODE3within6hours,andinMODE4,withoutrelianceonItheSGforheatremoval,within24hours.TheallowedCompletion Timesarereasonable, basedonoperating experience, toreachtherequiredunitconditions fromfullpowerconditions inanorderlymannerandwithoutchallenging unitsystems.SURVEILLANCE SR3.7.4.1REQUIREMENTS Toperformacontrolled cooldownoftheRCS,theADVsmustbeabletobeopenedandthrottled throughtheirfullrange.ThisSRensurestheADVsaretestedthroughafullcontrolcycle.Performance ofinservice testingoruseofanADVduringaunitcooldownmaysatisfythisrequirement

.TheSurveillance Frequency iscontrolled undertheSurveillance Frequency ControlProgram.REFERENCES 1.UFSAR,Section10.3.(continued)

PALOVERDEUNITS1,2,3B3.7.4-6REVISION58 SDCandCoolantCirculation

-LowWaterLevelB3.9.5B3.9REFUELING OPERATIONS B3,9.5ShutdownCooling(SDC)andCoolantCirculation

-LowWaterLevelBASESBACKGROUND ThepurposesoftheSDCSysteminMODE6aretoremovedecayheatandsensibleheatfromtheReactorCoolantSystem(RCS),asrequiredbyGDC34,toprovidemixingofboratedcoolant,toprovidesufficient coolantcirculation tominimizetheeffectsofaborondilutionaccident, andtopreventboronstratification (Ref.1).HeatisremovedfromtheRCSbycirculating reactorcoolantthroughtheSDCheatexchanger(s),

wheretheheatistransferred totheEssential CoolingWaterSystemviatheSDCheatexchanger(s)

.ThecoolantisthenreturnedtotheRCSviatheRCScoldleg(s).Operation oftheSDCSystemfornormalcooldownordecayheatremovalismanuallyaccomplished fromthecontrolroom.Theheatremovalrateisadjustedbycontrolling theflowofreactorcoolantthroughtheSDCheatexchanger(s) andbypassing theheatexchanger(s)

.Mixingofthereactorcoolantismaintained bythiscontinuous circulation ofreactorcoolantthroughtheSDCSystem,APPLICABLE Ifthereactorcoolanttemperature isnotmaintained belowSAFETYANALYSES200°F,boilingofthereactorcoolantcouldresult.Thiscouldleadtoinadequate coolingofthereactorfuelduetotheresulting lossofcoolantinthereactorvessel.Additionally

,boilingofthereactorcoolantcouldleadtoareduction inboronconcentration inthecoolantduetotheboronplatingoutoncomponents neartheareasoftheboilingactivity, andbecauseofthepossibleadditionofwatertothereactorvesselwithalowerboronconcentration thanisrequiredtokeepthereactorsubcritical

.Thelossofreactorcoolantandthereduction ofboronconcentration inthereactorcoolantwouldeventually challenge theintegrity ofthefuelcladding, whichisafissionproductbarrier.TwotrainsoftheSDCSystemarerequiredtobeOPERABLE,andonetrainisrequiredtobeinoperation inMODE6,withthewaterlevel<23ftabovethetopofthereactorvesselflange,topreventthischallenge.

SDCandCoolantCirculation

-LowWaterLevelsatisfies Criterion 2of10CFR50.36(c)(2)(ii)

.(continued)

PALOVERDEUNITS1,2,3B3.9.5-IREVISION0 SDCandCoolantCirculation

-LowWaterLevelB3.9.5BASESLCOInMODE6,withthewaterlevel<23ftabovethetopofthereactorvesselflange,bothSDCloopsmustbeOPERABLE.Additionally, oneloopoftheSDCSystemmustbeinoperation inordertoprovide:a.Removalofdecayheat;b.Mixingofboratedcoolanttominimizethepossibility ofacriticality; andc.Indication ofreactorcoolanttemperature

.AnOPERABLESDCtrainiscomposedofanOPERABLESDCpump(LPSIorCS)capableofproviding flowtotheSDCheatexchanger forheatremoval.SDCpumpsareOPERABLEiftheyarecapableofbeingpoweredandareabletoprovideflow,ifrequired.NotethattheCSpumpsshallnotbeusedfornormaloperations ifthewaterlevelisatorbelowthetopofthehot-legpipe(103'1")duetoconcernsofpotential airentrainment andgasbindingoftheCSpump(Ref.2).BothSDCpumpsmaybealignedtotheRefueling WaterTank(RWT)tosupportfillingtherefueling cavityorforperformance ofrequiredtesting.TheLCOismodifiedbyaNotethatallowsarequiredoperating SDClooptoberemovedfromserviceforupto1hourineach8hourperiod,providednooperations arepermitted thatwouldcauseareduction oftheRCSboronconcentration

.Boronconcentration reduction isprohibited becauseuniformconcentration distribution cannotbeensuredwithoutforcedcirculation

.Thispermitsoperations suchascoremappingoralterations inthevicinityofthereaGtorvesselhotlegnozzles,surveillance testingofECCSpumps,andRCStoSDCisolation valvetesting.Duringthis1hourperiod,decayheatisremovedbynaturalconvection tothelargemassofwaterintherefueling cavity.ThisLCOismodifiedbyaNotethatallowsoneSDClooptobeinoperable foraperiodof2hoursprovidedtheotherloopisOPERABLEandinoperation

.Priortodeclaring theloopinoperable, consideration shouldbegiventotheexistingplantconfiguration

.Thisconsideration shouldincludethatthecoretimetoboilisnotshort,thereisnodrainingoperation tofurtherreduceRCSwaterlevelandthatthecapacityexiststoinjectboratedwaterintothereactorvessel.Thispermitssurveillance teststobeperformed onthenon-operating loopduringatimewhenthesetestsaresafeandpossible.(continued)

PALOVERDEUNITS1,2,3B3.9.5-2REVISION58 SDCandCoolantCirculation

-LowWaterLevelB3.9.5BASESAPPLICABILITY TwoSDCloopsarerequiredtobeOPERABLE, andoneSDCloopmustbeinoperation inMODE6,withthewaterlevel<23ftabovethetopofthereactorvesselflange,toprovidedecayheatremoval.Requirements fortheSDCSysteminotherMODESarecoveredbyLCOsinSection3.4,ReactorCoolantSystem.MODE6requirements, withawaterlevel_23ftabovethereactorvesselflange,arecoveredinLCO3.9.4,"Shutdown CoolingandCoolantCirculation

-HighWaterLevel."ACTIONSA.1andA.2IfoneSDCloopisinoperable, actionshallbeimmediately initiated andcontinued untiltheSDCloopisrestoredtoOPERABLEstatusandtooperation, oruntil_>23ftofwaterlevelisestablished abovethereactorvesselflange.Whenthewaterlevelisestablished at>23ftabovethereactorvesselflange,theApplicability willchangetothatofLCO3.9.4,"Shutdown CoolingandCoolantCirculation

-HighWaterLevel,"andonlyoneSDCloopisrequiredtobeOPERABLEandinoperation

.Animmediate Completion Timeisnecessary foranoperatortoinitiatecorrective actions.B.1IfnoSDCloopisinoperation ornoSDCloopsareOPERABLE, therewillbenoforcedcirculation toprovidemixingtoIestablish uniformboronconcentrations

.Reducedboronconcentrations canoccurbytheadditionofwaterwithlowerboronconcentration thanthatcontained intheRCS.Therefore, actionsthatreduceboronconcentration shallbesuspended immediately

.B.2IfnoSDCloopisinoperation ornoSDCloopsareOPERABLE, actionshallbeinitiated immediately andcontinued withoutinterruption torestoreoneSDClooptoOPERABLEstatusandoperation

.SincetheunitisinConditions AandBconcurrently, therestoration oftwoOPERABLESDCloopsandoneoperating SDCloopshouldbeaccomplished expeditiously

.B.3IfnoSDCloopisinoperation ornoSDCloopsareOPERABLE, allcontainment penetrations providing directaccessfrom(continued)

PALOVERDEUNITS1,2,3B3.9.5-3REVISION58 SDCandCoolantCirculation

-LowWaterLevelB3.9.5BASESACTIONSB.3(Continued) thecontainment atmosphere totheoutsideatmosphere mustbeclosedwithin4hours.WiththeSDClooprequirements notmet,thepotential existsforthecoolanttoboilandreleaseradioactive gastothecontainment atmosphere

.Closingcontainment penetrations thatareopentotheoutsideatmosphere ensuresthatdoselimitsarenotexceeded.TheCompletion Timeof4hoursisreasonable, basedonthelowprobability ofthecoolantboilinginthattime.SURVEILLANCE SR3.9.5.1REQUIREMENTS ThisSurveiIIancedemonstrates thatoneSDCloopisoperating andcirculating reactorcoolantataflowrateofgreaterthanorequalto3780gpm.Theflowrateisdetermined bytheflowratenecessary toprovidesufficient decayheatremovalcapability andtopreventthermalandboronstratification inthecore.Inaddition, thisSurveillance demonstrates thattheotherSDCloopisOPERABLE.Inaddition, duringoperation oftheSDCloopwiththewaterlevelinthevicinityofthereactorvesselnozzles,theSDCloopflowratedetermination mustalsoconsidertheSDCpumpsuctionrequirements

.TheSurveillance Frequency iscontrolledundertheSurveillance Frequency ControlProgram.SR3.9.5.2Verification thattherequiredpumpthatisnotinoperation isOPERABLEensuresthatanadditional SDCpumpcanbeplacedinoperation, ifneeded,tomaintaindecayheatremovalandreactorcoolantcirculation

.Verification isperformed byverifying properbreakeralignment andpoweravailable totherequiredpump.TheSurveillance Frequency iscontrolledundertheSurveiIIanceFrequency ControlProgram.REFERENCES 1.UFSAR,Section5.4.7.2.PVNGSCalculation 13-MC-SI-0250, AppendixC.PALOVERDEUNITS1,2,3B3.9.5-4REVISION58