ML17223B295

Responds to Generic Ltr 91-06, Resolution of Generic Issue A-30, 'Adequacy of Safety-Related DC Power Supplies.'

ML17223B295
Person / Time
Site:	Saint Lucie
Issue date:	10/28/1991
From:	BOHLKE W H FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-A-30, REF-GTECI-EL, TASK-A-30, TASK-OR GL-91-06, GL-91-6, L-91-291, NUDOCS 9111060225
Download: ML17223B295 (27)

Text

ACCELERATEDDISTRIBUTIONDEMONSTTIONSYSTEM4REGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9111060225DOC.DATE:91/10/28NOTARIZED:YESFACIL:50-335St.LuciePlant,Unit1,FloridaPower&LightCo.50-389St.LuciePlant,Unit2,FloridaPower&LightCo.AUTH.NAMEAUTHORAFFILIATIONBOHLKE,W.H.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)

SUBJECT:

RespondstoGenericLtr91-06,"ResolutionofGenericIssueA-30AdequacyofSafety-RelatedDCPowerSupplies."NRCrequestedlicenseestoprovidewrittenresponsestoquestionsinEncl1ofgenericltrwithin180daysofltr.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTRiENCLQSIZE:TITLE:ORSubmittal:GeneralDistributionNOTESDOCKET0500033505000389DRECIPIENTIDCODE/NAMEPD2-2LANORRIS,JINTERNAL:ACRSNRR/DET/ESGBNRR/DST8E2NRR/DST/SICB8H7NUDOCS-ABSTRACTOGC/HDS3RES/DSIR/EIBEXTERNAL:NRCPDRCOPIESLTTRENCL11226611111111101111RECIPIENTIDCODE/NAMEPD2-2PDNRR/DET/ECMB7DNRR/DOEA/OTSBllNRR/DST/SELB7ENRR/DS~TSRXB8EO,C/'~LB'GFILEEO1.NSICCOPIESLTTRENCL1111111111101111DDDNOTETOALL"RIDS"RECIPIENTS:ADDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISTSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR24ENCL22 P.O.Box14000,JunoBeach,FL33408-0420October28,1991L-91-29110CFR50.54(f)U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:RE:St.LucieUnitNos.1and2DocketNos.50-335and50-389GenericLetter91-06ResonseAttachments1and2aretheFloridaPowerandLightCompanyresponsetoGenericLetter91-06"ResolutionofGenericIssueA-30AdequacyofSafety-RelatedDCPowerSupplies"forSt.LucieUnits1and2respectively.OnApril29,~1991,theNRCissuedGenericLetter91-06whichprovidedtheresultsofitsevaluationofGenericIssueA-30.Theevaluationdeterminedthatcertainmaintenance,surveillance,andmonitoringprovisionsareappropriateforsafety-relateddcsystems.Inordertodeterminewhetheranysitespecificstaffactionwouldberequired,theNRCrequestedlicenseestoprovidewrittenresponsestothequestionsinEnclosure1oftheGenericLetterwithin180daysofthedateoftheletter.TheattachedresponsesforSt.LucieUnit1and2areprovidedpursuanttoSection182oftheAtomicEnergyActof1954,asamended,and10CFR50.54(f).Pleasecontactusifthereareanyquestionsaboutthissubmittal.Verytrulyyours,W.H.BohlkeVicePresidentNuclearEngineeringandLicensingWHB/GRM/kwcc:StewartD.Ebneter,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlantDAS/PSL0547-91!9iii0602259ii02SPDRADOCK05000335PPDR:9anFPLGroupcompanycp I~1AsF St.LucieUnitNos.1and2DocketNos.50-335and50-389.GenericLetter91-06ResonseSTATEOFFLORIDA))COUNTYOFPALMBEACH)SS~W.H.Bohlkebeingfirstdulysworn,deposesandsays:ThatheisVicePresident,NuclearEngineeringandLicensingfortheNuclearDivisionofFloridaPower6LightCompany,theLicenseeherein;Thathehasexecutedtheforegoingdocument;thatthestatementsmadeinthisdocumentaretrueandcorrecttothebestofhisknowledge,informationandbelief,andthatheisauthorizedtoexecutethedocumentonbehalfofsaidLicensee.W.H.BohlkeSubscribedandsworntobeforemethis~cP>aayor19'P/NOTARYPUBLIC,indfortheCountyofPalmBeach,StateofFloridaffotaryPublic,StateofFlorfdaMyComm.Exp.Feb.18,1995MyCommissionexpiresBondedthruPLGHARDIns.Aaen 0~I1~~>~9~"'~hi~o*>

ATTACHMENT1ST.LUCIEUNIT1QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-2.aQ2.bQ-3.aUnitThenumberofindependentredundantdivisionsofclass1Eorsafety-relatedDCpowerforthisplant.(IncludeanyseparateClass1EorSafety-relatedDC,suchasanyDCdedicatedtothedieselgenerators.)Thcnumberoffunctionalsafety-rclatcddivisionsofDCpowernecessarytoattainsafeshutdownforthisunit.Doesthecontrolroomatthisunithavethcfollowingseparate,indepcndcntlyannunciatedalarmsforeachdivisionofDCpower?1.Batterydisconnectorcircuitbreakeropen?R-1.St.LucieUnit1DocketNo.50-335R-2.a.St.LucieUnit1hastwo(2)independentredundantdivisionsofclass1Eorsafety-relatedDCPowerdesignated1Aand1B.Eachsubsystemconsistsofa125voltDCBusdcsignatcd1A(1B),a125voltsafety-relatedbatterydcsignatcd1A(1B),and2safety-related125voltbatterychargersdesignated1Aand1AA(1Band1BB).Inaddition,aswingbusdcsignatcd1ABwithasingle125voltDCbatterychargerdcsignatcd1ABcanbcalignedtoeitherthc1Abusorthe1Bbus.R-2.b.St.LucieUnit1requiresonc(1)ofthefunctionalsafety-rclatcddivisionsofDCpower,eitherAorB,toattainsafeshutdown.R-3.a.St.LucieUnit1hasthcfollowingannunciatedalarmsinthecontrolroom:1.Ycs,anopenbatterydisconnectorcircuitbreakerisalarmedbyANNUNCIATORSA-30orB30.2.Batterychargerdisconnectorcircuitbreakeropen(bothinputAC&outputDC)'?A-30(B-30)"125VDCBUS1B(1A)UNDERVOLTAGE/MAINBATTERYBREAKER."2.Ycs,anopenbatterychargerdisconnectorcircuitbreaker(eitherinputACoroutputDC)isalarmedbyANNUNCIATORSA-20,B-20,Z9,&Z10.3.DCsystemground?A-20(B-20)"125VDCBUS1B(IA)BA7LCHGR./BATT.RMFANTROUBLE"Z-9(Z-10)BATTERYCHARGER1AA(1BB)TROUBLE"3.Ycs,aDCsystemgroundisalarmedbyANNUNCIATORSA-10&B-10.4.DCbusundervoltage?A-10(B-10)"125VDCBUS1B(1A)GROUND"4.Yes,aDCbusundervoltageisalarmedbyANNUNCIATORSA-30&B-305.DCbusovervoltage?A-30(B-30)SameannunciatorasresponseR-3.a.15.Ycs,aDCbusovcrvoltageisalarmedbyANNUNCIATORSA-20&B-20.A-20(B-20)SameannunciatorasresponseR-3.a.2Inadditionhighvoltagecausesthebatterychargershutdownandtroublealarm.

0C~

QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSE6.Batterychargerfailure?6.Yes,abatterychargerfailureisalarmedbyANNUNCIATORSA-20&B-20Q-3.b7.Batterydischarge?DocsthccontrolroomatthisunithavethcfollowingseparateindependentindicationsforeachdivisionofDCpower'?1.Batteryfloatchargecurrent'?A-20(B-20)SameannunciatorasresponseR-3.a.27.No,St.LucieUnit1docsnothaveabauerydischargealarm.ScethcresponsetoQ-5forjustification.R-3.b.St.LucieUnit1hasthefollowingindicationsinthecontrolroom:1.No,Unit1doesnothavebatteryfloatcurrentindicationinthccontrolroom.ScetheresponsetoQ-5forgustiflcation.Q-3.c2.Batterycircuitoutputcurrent?3.Bauerydischarge?4.Busvoltage?Doestheunithavewrittenproccdurcsforresponsetothealarms(3.a1-7)andindications(3b.1<)?2.No,Unit1doesnothavebatterycircuitoutputcurrentindicationinthccontrolroom.SccthcresponsetoQ-5forjustification.3.No,Unit1doesnothavebatterydischargeindicationinthecontrolroom.SccthcresponsetoQ-5forjustification.4.Ycs,DCbusvoltageindicationisprovidedinthecontrolroombyvoltmctcrsVM-1001&VM-1002andindcpcrfdcntwhiteindicatinglights.R-3.c.Ycs,writtenproceduresfortheresponsetothcalarms(R-3.a.1-7)&Indications(R-3.b.14)arelistedbelow:3.a.1-7(Alarms)OP1-0960020"125VDCSYSTEMNORMALOPERATION"ONOP1-0030131"PLANTANNUNCIATORSUMMARY"ONOP1M60030"DCGROUNDISOLATION"DoesthisunithaveindicationofbypassedandinoperablestatusofcircuitbrcakcrsorotherdevicesthatcanbcusedtodisconnectthcbatteryandthcbatterychargerfromitsDCbusandthebatterychargerfromitsACpowersourceduringmaintenanceortesting?3.b.I<(indications)OP1-0960020125VDCSYSTEMNORMALOPERATION"ONOP1~30136"LOSSOFASAFETYRELATEDDCBUS"RPYcs,bypassand/orinoperablestatusofDCoutputorACinputcircuitbrcakcrsisprovidedbythccontrolroomannunciatorsidentifiedinR-3,specificallyA-20(B-20)&,A-30(B-30)provideannunciationofbatterychargertroubleincludingACpowerfailure,andmisalignmentofbatteryoutputbreakers.Howcvcr,thereisnospecificalarmorindicationprovidedtoidentifyaninoperablecircuitbreaker.ScetheresponsetoQ-5forjustification.

'l~q QUESTION'O.GENERICLETTERREQUESTFPLRESPONSEIfthcanswertoanypartofquestion3or4isno,thenprovideinformationjustifyingtheexistingdesignfeaturesofthefacility'ssafety-relatedDCsystems.R-3.a.7R-3.b.1R-3.b.2R-3.b.3RPInsteadofdcvclopingEcsupplyingthcjustification,FPLmaycommittoperformthcevaluationsduringthepcrformanccoftheIPEforscvcreaccidentvulnerabiliticsHasFPLconductedareviewofmaintenanceandtestingactivitiestominimizethepotentialforhumanerrorcausingmorethanonc(1)DCdivisiontobeunavailable?R-5Anccdhasnotbeenidentifiedforanalarminquestion3.a.7(batterydischargealarm)orthccontrolroomindicationsinquestions3.b.1(batteryIloatcurrent),3.b.2batterycircuitoutputcurrent),or3.b.3(batterydischargeindicators)norisanyrccommcndcdbyIEEE308-1971fortheseparameters.Fortheinoperablestatusindicationofquestion4,thccontrolroomannunciatorsA-20(B-20)andA-30(B-30)provideannunciationofbatterychargertroubleincludingACpowerfailureandmisalignmentofthebatteryoutputbrcakcrs.ThereisnospecificalarmorindicationprovidedtoidentifyaninoperablecircuitbreakerandnoneisrecommendedbyIEEE308-1971.Aninoperablecircuitbreaker'thatwillnotcloseorthatwilltripprematurelywouldbcdctcctcdbyoncofthealarmslistedabove.Aninopcrablccircuitbreakerthatwillnotopenisanundctcctablefailurevianormalannunciatorssinceitsnormaloperatingmodeisthcclosedposition.Thissituationwillnotinterferewithbatteryoperation.R4.1Ycs,St.LucicPlanthaspcrformcdahumanfactorsrcvicwoftheclcctricalmaintenanceproccdurcsforDCdistributioncquipmcnt.ThereviewwaspartofamaintcnanccprocedureupgradeprogrambutwasnotpcrformcdspecificallytopreventhumanerrorfromcausingmorethanoneDCdivisiontobecomeunavailablc.Q-7.aDoplantproceduresprohibitmaintenanceortestingonredundantDCdivisionsatthcsametime?IfthefacilityTechnicalSpecificationsforthisunithaveprovisionsequivalenttothosefoundintheCombustionEngineeringStandardTcchnicalSpecificationsformaintenanceandsurveillance?Aremaintenance,surveillanceandtestproccdurcsrequiringstationbattcricsconductedroutinelyatthisplant?Atleastbnccpcr7daysarcthefollowingverifiedtobcwithinacccptablclimits:R4.2.PlantAdministrativeProcedure(AP)AP0010142"ManipulationofSensitiveSystems"prohibitsmaintenanceontwo(2)portionsofasensitivesystemorontwoseparatescnsitivcsystemsatthesametime.The125vDCelectricalsystemisadcsignatcdsensitivesysteminAP0010142.R-7ThcSt.LucicUnit1TcchnicalSpecificationshaveprovisionssimilartotheCombustionEngineeringStandardTcchnicalSpecificationsformaintenanceandsurvcillancc,howcvcrbccauscofthcdiffercnccsaresponsetoquestion7isbeprovided.Ycs,asdetailedintheresponsetoquestions7.aThrough7.ebelow,proccdurcsformaintcnancc,surveillance,andtestingareroutinelyconductedonthestationbattcrics.R-7.aMaintenanceProcedureMP0960163providestheweeklytestsandinspections.1.Pilotcellelectrolytelevel?2.Specificgravityand/orchargingcurrent?1.Ycs,MP0960163verifiespilotcellelectrolytelevelatwccklyintervals.2.Ycs,MP0960163vcrificschargingcurrentattheoutputshuntmctcrconnectionsofeachbatterychargerusingaDVOMandthechargingcurrentusingtheinstalledmeteringatwccklyintervals.Inaddition,MP0960163teststhespecificgravityofeachbatterypilotcellatwccklyintervalstoverifythattheyarewithinacceptablelimits.

0ICk1hI.

QUESTIONNO.GENEMCLETTERREQUESTFPLRESPONSE3.Floatvoltage?3.Ycs,MP0960163vcrificsthebatteryfloatvoltageusinginstalledpanelmctcringatthebatterychargcrsatwccklyintervals.Q-7.b4.Totalbusvoltageonfloatcharge?S.Physicalconditionofallcells?Atleastoncepcr92days,orwithin7daysaflcrabatterydischarge,overcharge,orifpilotcellreadingsareoutsidethe7daysurveillancercquircmcntsarethefollowingverifiedtobewithinacccptablclimits:1.ElectrolyteIcvclineachcell?4.Ycs,MP0960163verifiesbatterybusvoltageusingtheinstalledpanelmeteringatthcDCbusesatweeklyintervals.S.Ycs,MP0960163visuallyinspectsthcindividualbatterycellsforcracks,loosematerial,dust,dirt,corrosion,andclcctrolytcleaks.R-7.b.MaintenanceProcedureMP0960164providesthemonthlyinspectionsandteststhatcorrespondtothequarterlyrcquircmcntsofquestion7.b.Note:Theparametersofquestion7.bareverifieifthcpilotcellreadingsarcoutsidethe74aysurveillancercquircmcntsforthcbatterics,pcrperiodicMaintcnanccProccdurcMP0960163.ThcscparamctcrsarcalsovcrificdaRcradischargetestofthcbattericspcrtherequirementsofMaintenanceProccdurcsMP1%960062&MP1M60063forthc1AEcIBbattcricsrcspcctivcly.Anoverchargeofthestationbattcricsisnotanticipatedduringthclifetimeofthcbatteries,sorecoveryfromanoverchargeofthebattcricsisnotprocedurallydocumented.Ifsuchanoverchargeoccurred,recommendationstoverifytheintegrityofthebatterieswouldbeconsidered,andwouldlikelyincludetheparamctcrsvcrificdinthcmonthlybatterymaintenance.procedureasaminimum..1.Ycs,MP0960164verifiestheelcctrolytclevelatmonthlyintervals.2.Theaveragespecificgravityofallcells?3.Thespecificgravityofeachcell?4.Theaverageelectrolytetcmpcratureofarcprcscntativenumberofcells?S.Thefloatvoltageofeachcell?6.Visuallyinspectormcasurcresistanceofterminalsandconnectors(includingtheconnectorsattheDCbus)?2.Ycs,MP0960164mcasurcsthcspecificgravityofallcellsandthencalculatestheaveragespecificgravityofthecellsmonthly.3.Ycs,MP0960164recordsthespecificgravityofeachcellmonthly.4.Ycs,MP0960164Calculatesthcaverageclcctrolytctemperatureofthebatterymonthly.S.Ycs,MP0960164recordsthebatteryfloatvoltagemonthly.6.Ycs,MP0960164visuallyinspectsallbatteryconnectionsmonthly.Ifanyvisualcorrosionisnoted,microwhmreadingsoftheaffcctcdbatteryconnectionsarcpcrformcd.However,thcconnectionsattheDCbusarenotverifiedbythisvisualinspectionsincetheyarenotinacorrosiveenvironmentandhavenotbccnnotedtobecorrodedinanypastperiodicmaintcnanccpcrformcdonthisequipment.

01Il QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-7.cAtleastcvcry18monthsarcthcfollowingverified:1.Lowresistanceofeachconnection(bytest)R-7.cMaintcnanccProceduresMP14960062,MP1-0960063,MP0960150,andMP0960165providethe18monthtestsandinspections.l.Ycs,MP0960150verifiestheresistanceofallbatteryintcr~cllandterminalconnectionsat18monthintervals.2.Physicalconditionofthebattery'2.Ycs,MP0960150includesaphysicalinspectionofallbatterycellsat18monthintervals.3.BatterychargercapabilitytodeliverratedampcrcoutputtotheDCbus?3.Ycs,MP0960165verifiethecapabilityofthebatterychargcrstodclivcrratedoutputtothcDCbuscvcry18months.Q-7.dQ-8.a4.ThecapabilityofthebatterytodeliveritsdesigndutycycletotheDCbus?5.Eachindividualcellvoltageiswithinacceptablelimitsduringtheservicetest?Atleastcvcry60months,iscapacityofeachbatteryverifiedbyperformanceofadischargetest?Atleastannually,isthcbatterycapacityverifiedbyperformancedischargetest,ifthcbatteryshowssignsofdegradationorhasreached85%ofexpectedlife?Docsthcunithaveoperationalfeaturessuchthatfollowinglossofonesafety-relatedDCpowersupplyorbus:a.,Capabilityismaintainedforensuringcontinuedandadequatereactorcooling'4.Ycs,MP14960062&MP14960063,verifythecapabilityofthebatteries1A&,1BrespectivelytodelivertheirdesigndutycycletothcDCbusat18monthintervals.5.Ycs,MP1-0960062&MP1-0960063verifytheindividualcellvoltagesofthcbatterics1A&1Brcspcctivclyat18monthintervals.R-7.d.Ycs,MaintenanceProceduresMP1-0960151&MP14960152verifythecapacityofthcstationbatteriesbyperformanceofadischargetestat60monthintervalsforthe1A&1Bbattcricsrcspcctivcly.R-7.e.Ycs,MaintenanceProccdurcsMP14960151&MP14960152providefortheannualtestandinspectionsandperformanceofabatterydischargetestifthcbatteryshowssignsofdegradationorhasreached85percentoftheexpcctcdservicelife.R-8.a.YcsUFSARSection8.3.discusseshowthecapabilityismaintainedforensuringcontinuedandadequatereactorcoolingfollowingthclossofoncsafety-relatedDCpowersupplyorbus.LoadgroupsAandBareeachcapableofsupplyingthcminimumDCpowerrequirementstosafelyshutdowntheplantand/ormitigatetheconsequencesofaLOCA.Q-g.bDocsthcunithaveoperationalfcaturcssuchthatfollowinglossofonesafcty-relatedDCpowersupplyorbus:b.Reactorcoolantsystemintegrityandisolationcapabilityarcmaintained?R-8.b.Ycs,UFSARSection8.3discusseshowreactorcoolantsystemintegrity(RCS)andisolationcapabilityaremaintainedfollowingalossofonesafety-rclatcdDCpowersupplyHowcvcr,inOperationalModes1through4thclossofonesafety-relatedDCbuswillinitiateareactortripsignalinthcreactorprotectionsystemandwillcausethePORVintheoppositetraintoopen.Off-NormalOperatingProcedureONOP14030136directsthcoperatortoclosetheassociatedblockvalvewhichrestoresRCSintegrity.ScetheresponsetoQ-9forjustification.

',I)

~~1QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-g.cDoestheunithaveoperationalfeaturessuchthatfollowinglossofoncsafety-relatedDCpowersupplyorbus:c.Operatingprocedures,instrumentation(includingindicators&annunciators),andcontrolfunctionsareadequatetoinitiatesystemsasrequiredtomaintainadcquatccorecooling?R-8.cYcs,OffNormalOperatingProcedureONOP1-0440030,"ShutdownCoolingOff-Normal"providesguidanceforrealignmentofthcshutdowncoolingsystemshouldalossoccur.Additionally,alternatemeansofdecayheatremovalareprovidedinaccordancewithGenericLetter88-17,withinthisproccdurc.Off-NormalOperatingProccdurcONOP14030136"LossofSafety-RelatedDCBus"providesguidanceforlossofoncsafetyrelatedDCbus.Iftheanswertoanypartofquestion6,7,or8isnothenprovidethebasisfornotperformingthcmaintenance,surveillance,and/ortestproceduresdescribedand/orthebasesfornotincludingtheoperationalfeaturescited.Unit1controlroomannunciatorsarepoweredfromtheIABDCbus,allowingmanualrealignmentifrequiredtoanoperablc1Aor1BDCbus.TheopeningofonePORVatpowerisboundedbythcanalysisinsection15.2ofthcUFSAR.TheOff-NormalOperatingProcedureprovidesthcoperatorwithguidanceforlossofoncsafety-relatedDCbus.R-8.bInsteadofdcvclopingEcsupplyingtheinformationinresponsetoQuestion9,FPLmaycommittofurtherevaluatethcnccdforsuchprovisionsduringtheperformanceofthcIPEforsevereaccidentvulncrabilitics.

A'

~~~~~ATTACHMENT2ST.LUCIEUNIT2QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-2.aQ-2.bQ-3.aUnitThcnumberofindependentredundantdivisionsofclass1Eorsafety-relatedDCpowerforthisplant.(IncludeanyseparateClass1EorSafety-relatedDC,suchasanyDCdedicatedtothedieselgenerators.)Thenumberoffunctionalsafety-relateddivisionsofDCpowernecessarytoattainsafeshutdownforthisunit.Doesthecontrolroomatthisunithavethefollowingscparatc,indcpcndcntlyannunciatedalarmsforeachdivisionofDCpower'1.Batterydisconnectorcircuitbrcakcropen?R-1.St.LucieUnit2DocketNo.50-389R-2.a.St.LucieUnit2hastwo(2)independentredundantdivisionsofclass1Eorsafety-relatedDCpowerdesignated2Aand2B.Eachsubsystemconsistsofa125voltDCbusdcsignatcd2A(2B),a125volt,safety-relatedbatterydesignated2A(2B),andtwo(2)safety-related125voltbatterychargcrsdesignated2Aand2AA(2Band2BB).Inaddition,aswingbusdesignated2ABwithasingle125voltbatterychargerdesignated2ABcanbealignedtoeitherthe2Aorthe2Bbus.R-2.b.St.LucieUnit2requiresone(1)ofthefunctionalsafety-rclatcddivisionsofDCpower,either2Aor2B,toattainsafeshutdown.R-3.aStLucicUnit2hasthefollowingannunciatedalarmsinthecontrolroom:1.Yes,anopenbatterydisconnectorcircuitbreakerisalarmedbyANNUNCIATORSA48&B-50.A<8(B-50)"125VDCBATT.2B(2A)DISCHARGEHI/BKROPEN"2.Batterychargerdisconnectorcircuitbrcakcropen(bothinputAC&outputDC)?2.Yes,anopenbatterychargerdisconnectorcircuitbreaker(cithcrinputAC&outputDC)isalarmedbyANNUNCIATORSA-20&B-20.A-20(B-20)"125VDC2B/2BB(2A/2AA)BATT.CHGR.2B/2BB(2A/2AA)TROUBLE"3.DCsystemground?3.Yes,aDCsystemgroundisalarmedbyANNUNCIATORSA-10&B-10.A-10(B-10)"125VDCBUS2B/2BB(2A/2AA)GROUND"n4.DCbusundervoltage?4.Ycs,aDCbusundervoltagealarmisprovidedbyANNUNCIATORSA-30&B-30.A-'30(B-30)"125VDCBUS2B(2A)UNDERVOLTAGE" QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSE5.DCbusovervoltage'?5.Yes,aDCbusovervoltagealarmisprovidedbyANNUNCIATORSA-20&B-20.A-20(B-20)sameannunciatorasresponseR-3.a.2Inaddition,highvoltagecausesbatterychargershutdown&troublealarm.6.Batterychargerfailure?6.Yes,abatterychargerfailurealarmisprovidedbyANNUNCIATORSA-20&B-20.A-20(B-20)sameannunciatorasresponseR-3.a.27.Batterydischarge'?7.Ycs,abatterydischargealarmisprovidedbyANNUNCIATORSAA8&B-50.A48(B-50)sameannunciatorasresponseR-3.a.lQ-3.bQ-3.cDocsthecontrolroomatthisunithavethefollowingseparateindcpcndcntindicationsforeachdivisionofDCpower?1.Batteryfloatchargecurrent?2.Batterycircuitoutputcurrent?3.Batterydischarge?4.Busvoltage?Doesthcunithavewrittenproceduresforresponsetothcalarms(3.a1-7)andindications(3b.1-4)?R-3.b.St.LucieUnit2hasthefollowingindicationsforeachdivisionofDCpower:1.No,Unit2doesnothavefloatcurrentindicationinthecontrolroom.SeetheresponsetoQ-5forjustification.',2.Yes,batterycircuitoutputcurrentindicationisprovidedinthecontrolroombyAM-1801&AM-1802.3.Yes,batterydischargeindicationisprovidedinthecontrolroombyAM-1801&AM-1802.4.BusvoltageindicationisprovidedinthecontrolroombyvoltmetersVM-1001&VM-1002andindcpcndcntwhiteindicatinglights.R-3.c.Ycs,writtenproceduresforthercsponsctothealarms(R-3.a.1-7)&indications(R-3.b.ld)arelistedbelow:R-3.a.1-7(Alarms)OP2-0960020"125VDCSYSTEMNORMALOPERATION"ONOP24030131"PLANTANNUNCIATORSUMMARY"ONOP2-0960030"DCGROUNDISOLATION"R-3.b.1<(indications)OP2-0960020"125VDCSYSTEMNORMALOPERATION"ONOP2%030136"LOSSOFASAFETYRELATEDDCBUS" 4>>V,II QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEDocsthisunithaveindicationofbypassedandinoperablestatusofcircuitbreakersorotherdcviccsthatcanbeusedtodisconnectthebatteryandthebatterychargerfromitsDCbusandthebatterychargerfromitsACpowersourceduringmaintenanceortesting?RPYcs,bypassedand/orinopcrablcstatusindicationisprovidedbycontrolroomannunciatorsA<8(B-50)foranopenbatterydischargebreaker.CommontroublealarmsA-20(B-20)annunciateforalossofACpowertothebatterychargers.However,thereisnospecificalarmorindicationprovidedtoidentifyaninoperablecircuitbreaker;secthcresponsetoQ-5forjustification.Q-5Q4.1Iftheanswertoanypartofquestion3or4isno,thenprovideinformationjustifyingtheexistingdesignfeaturesofthefacility'ssafety-relatedDCsystems.R-3.a.7R-3.b.1R-3.b.2R-3.b.3RAInsteadofdcvcloping&supplyingthejustification,FPLmaycommittoperformtheevaluationsduringtheperformanceofthcIPEforsevereaccidentvulnerabiliticsHasFPLconductedareviewofmaintenanceandtestingactivitiestominimizethepotentialforhumanerrorcausingmorcthanone(1)DCdivisiontobeunavailablc?R-5Aneedhasnotbeenidentifiedfortheindicationinquestion3.b.1(batteryfloatcurrent)norisanyrccommcndcdbyIEEE308-1971asmodifiedbyR.G.1.32,Rcv0forthisparamctcr.Forthcinoperablestatusindicationofquestion4,thccontrolroomannunciatorsA<8(B-50)provideindication,ofanopenbatteryoutputbreaker.CommontroublealarmsA-20(B-20)provideannunciationofbatterychargertroubleincludingACpowerfailure.ThereisnospecificalarmorindicationprovidedtoidentifyaninoperablecircuitbreakerandnoneisrccommcndcdbyIEEE308-1971asmodifiedbyR.G.1.32,Rcv0.Aninoperablecircuitbreakerthatwillnotcloseortripprcmaturclywouldbedetectedbyoneofthcalarmslistedabove.Aninoperablecircuitbreakerthatwillnotopenisanundetectablefailurevianormalannunciatorssinceitsnormaloperatingmodeistheclosedposition.Thissituationwillnotinterferewithbatteryoperation.R4.1Yes,ST.LucioplanthasperformedareviewofthcclcctricalmaintenanceproccdurcsregardingDCdistributionequipmentwithrcspccttohumanfactorconcerns.ThercvicwwasperformedaspartofamaintenanceprocedureupgradeprogrambutwasnotperformedspecificallytoprcvcnthumanerrorfromcausingmorethanoneDCdivisiontobecomeunavailable.Q-6.2DoplantproceduresprohibitmaintenanceortestingonredundantDCdivisionsatthesametime?R 2PlantAdministrativeProcedure(AP)AP0010142"ManipulationofScnsitivcSystems"prohibitsmaintenanceontwo(2)portionsofsamesensitivesystemorontwoseparatesensitivesystemsatthesametime.The125vDCelectricalsystemisadesignatedsensitivesysteminAP0010142.IfthefacilityTcchnicalSpecificationsforthisunithaveprovisionsequivalenttothosefoundintheCombustionEngineeringStandardTechnicalSpecificationsformaintenanceandsurveillance?Arcmaintenance,surveillanceandtestproccdurcsrequiringstationbattericsconductedroutinelyatthisplant?R-7ThcSt.LucieUnit2TcchnicalSpecificationshaveprovisionssimilartotheCombustionEngineeringStandardTcchnicalSpecificationsformaintenanceandsurveillance,,howeverbecauseofthedifferencestheresponsetoquestion7isbeprovided.Yes,asdetailedintheresponsetoquestions7.athrough-7.ebelow,proceduresformaintenance,surveillance,andtestingarcroutinelyconductedforthestationbattcrics.

IEK+~QI~Ass QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-7.aAtleastoncepcr7daysarethefollowingverifiedtobewithinacceptablelimits:R-7.aMaintenanceProcedureMP0960163providestheweekly(7daysurvcillanccs)testsandinspections.1.Pilotcellelectrolytelevel?1.Yes,MP0960163verifiespilotcellelectrolytelevelatweeklyintervals.2.Specificgravityand/orchargingcurrent?2.Yes,MP0960163verifieschargingcurrentattheoutputshuntmeterconnectionsofeachbatterychargerusingaDVOMandthechargingcurrentusingtheinstalledmeteringatweeklyintervals.Inaddition,thcspecificgravityofeachbatterypilotcellistestedatweeklyintervalstoverifythattheyarewithinacceptablelimits.3.Floatvoltage?3.Yes,MP0960163verifiesthebatteryfloatvoltageusinginstalledpanelmeteringatthebatterychargcrsatweeklyintervals.4.Totalbusvoltageonfloatcharge?4.Ycs,MP0960163verifiesbatterybusvoltageusingtheinstalledpanelmeteringattheDCbusesatwccklyintervals.Q-7.b5.Physicalconditionofallcells?Atleastoncepcr92days,orwithin7daysafterabatterydischarge,ovcrchargc,orifpilotcellreadingsareoutsidethe7daysurveillancerequirementsarcthefollowingverifiedtobewithinacceptablelimits:1.Elcctrolytclevelineachcell?5.Ycs,MP0960163visuallyinspectsthcindividualbatterycellsforcracks,loosematerial,dust,dirt,"corrosion,andelectrolyteleaks.R-7.b.MaintenanceProcedureMP0960164providesthcmonthlyinspectionsandteststhatcorrcspondtothequarterlyrequirementsofquestion7.b.NOTE:Theparametersofquestion7.bareverifieifthepilotcellreadingsareoutsidethc74aysurveillancerequirementsforthcbatteries,perperiodicMaintenanceProccdurcMP0960163.TheseparamctcrsarealsovcrificdaflcradischargetestofthebatteriespertherequirementsofMaintenanceProceduresMP2-0960062,EcMP24960063forthe2A&2Bbatteriesrespectively.Anoverchargeofthestationbattcricsisnotanticipatedduringthclifctimcofthebatteries,sorecoveryfromanoverchargeofthebatteriesisnotprocedurallydocumcntcd.Ifsuchanoverchargeoccurred,recommendationstoverifytheintegrityofthebattcricswouldbcconsidered,andwouldlikelyincludetheparametersverifiedinthemonthlybatterymaintenanceprocedureasaminimum.2.Theaveragespecificgravityofallcells?3.Thespecificgravityofeachcell?4.Theaverageelectrolytetcmpcratureofarepresentativenumberofcells?1.Ycs,MP0960164verifiestheelectrolytelcvclatmonthlyintervals.2.Ycs,MP0960164measuresthcspecificgravityofallcellsandthencalculatesthcaveragespecificgravityofthecellsmonthly.3.Yes,MP0960164recordsthespcciflcgravityofeachcellmonthly.4.Ycs,MP0960164calculatestheavcragcclcctrolytctcmpcraturcofthebatterymonthly.

'-c"Aas' nQUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-7.c5.Thefloatvoltageofeachcell?6.Visuallyinspectormeasureresistanceofterminalsandconnectors(includingtheconnectorsattheDCbus)'?Atleastevery18monthsarethefollowingverified:1.Lowresistanceofeachconnection(bytest)5.Ycs,MP0960164recordsthebatteryfloatvoltage'onthly.6.Ycs,MP0960164visuallyinspectsallbatteryconnectionsmonthly.Ifanyvisualcorrosionisnoted,microwhmreadingsoftheaffcctcdbatteryconnectionsareperformed.However,theconnectionsatthcDCbusarenotvcrifledbythisvisualinspectionsincetheyarenotlocatedinacorrosivecnvironmcntandhavenotbeennotedtobccorrodedinanypastperiodicmaintenanceperformedonthiscquipmcnt.R-7.cMaintenanceProceduresMP,2-0960062,MP2-0960063,MP0960150,&MP0960165providethe18monthtestsandinspections.1.Ycs,MP0960150verifiestheresistanceofallbatteryinter-cellandterminalconnectionsat18monthintervals.2.Physicalconditionofthcbattery?3.BatterychargercapabilitytodeliverratedampereoutputtothcDCbus'?2.Ycs,MP0960150includesaphysicalinspectionofallbatterycellsat18monthintervals.3.Ycs,MP0960165verifiesthecapabilityofthebatterychargcrstodeliverratedoutputtotheDCbusevery18months.Q-7.dQ-7.eQ-8.a.4.ThecapabilityofthcbatterytodeliveritsdesigndutycycletotheDCbus?5.Eachindividualcellvoltageiswithinacceptablelimitsduringtheservicetest?Atleastevery60months,iscapacityofeachbatteryverifiedbyperformanceofadischargetest?Atleastannually,isthebatterycapacityverifiedbyperformancedischargetest,ifthcbatteryshowssignsofdegradationorhasrcachcd85%ofexpectedlife?Doestheunithaveoperationalfeaturessuchthatfollowinglossofonesafety-rclatcdDCpowersupplyorbus:a.Capabilityismaintainedforensuringcontinuedandadequatereactorcooling?4.Ycs,MP2-0960062&MP2-0960063verifythecapabilityofthebatteries2A&2BrespectivelytodclivcrtheirdesigndutycycletothcDCbusat18monthintervals.5.Ycs,MP2-0960062&MP2-0960063verifytheindividualcellvoltagesofthebatteries2A&2Brespectivelyat18monthintervals.R-7.d.Ycs,MP2-0960151&MP2-0960152verifythecapacityofthestationbatteriesbyperformanceofadischargetestat60monthintervalsforthe2A&2Bbatteriesrespectively.R-7.e.Ycs,MaintenanceProceduresMP2-0960151&MP2-0960152providetheannualtestsandinspectionsandprovideforthcbatterydischargetestifthebatteryshowssignsofdegradationorifthebatteryhasreached85percentoftheexpcctcdservicelife.R-g.a.Ycs,UFSARSection8.3.discusseshowthecapabilityismaintainedforensuringcontinuedandadcquatcreactorcoolingfollowingthelossofoncsafety-relatedDCpowersupplyorbus.LoadgroupsAandBareeachcapableofsupplyingtheminimumDCpowerrequirementstosafelyshutdowntheplant.

l' QUESTIONNO.GENERICLETTERREQUESTFPLRESPONSEQ-8.bDocstheunithaveoperationalfeaturessuchthatfollowinglossofoncsafety-relatedDCpowersupplyorbus:b.Reactorcoolantsystemintegrityandisolationcapabilityaremaintained?R-8.b.Yes,UFSARSection8.3discusseshowreactorcoolantsystemintegrity(RCS)andisolationcapabilityaremaintainedfollowingalossofonesafety-relatedDCpowersupply.However,inOperationalModes1through4thelossofonesafety-rclatcdDCbuswillinitiateareactortripsignalinthereactorprotectionsystemandwillcausethePORVintheoppositetraintoopen.Off-NormalOperatingProcedureONOP2%030136directstheoperatortoclosetheassociatedblockvalvewhichrestoresRCSintegrity.ScctheresponsetoQ-9forjustification.Q-g.cDoestheunithaveoperationalfeaturessuchthatfollowinglossofoncsafety-rclatcdDCpowersupplyorbus:c.Operatingprocedures,instrumentation(includingindicators&annunciators),andcontrolfunctionsareadequatetoinitiatesystemsasrcquircdtomaintainadequatecorecooling?R-8.cOffNormalOperatingProcedureONOP2-0440030,"ShutdownCoolingOff-Normal"providesguidanceforrealignmentofthcshutdowncoolingsystemshouldalossofonesafety-relatedDCbusoccur.Additionally,alternatemeansofdecayheatremovalareprovidedinaccordancewithGeneriLetter88-17,withinthisprocedure.Off-NormalOperatingProccdurcONOP2-0030136"LossofSafety-RelatedDCBus"providesguidanceforlossofoncsafety-relatedDCbus.Unit2controlroomannunciatorsarepoweredfromthevitalACbus.Ifthcanswertoanypartofquestion6,7,or8isnothenprovidethcbasisfornotperformingthemaintenance,surveillance,and/ortestproceduresdcscribcdand/orthebasesfornotincludingthcoperationalfeaturescited.TheopeningofonePORVatpowerisboundedbytheanalysisinsection15.6oftheUFSAR.TheOff-NormalOperatingProcedureprovidestheoperatorwithguidanceforlossofonesafety-relatedDCbus.R-8.bInsteadofdcvcloping&supplyingthcinformationinresponsetoQuestion9,FPLmaycommittofurthercvaluatcthcneedforsuchprovisionsduringthepcrformanccoftheIPEforsevereaccidentvulncrabilitics.