ML17215A270

Safety Parameter Display Sys Parameter Selection Evaluation & Implementation Plan.

ML17215A270
Person / Time
Site:	Saint Lucie
Issue date:	03/01/1984
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17215A269	List: ML17215A268 ML17215A270
References
RTR-NUREG-0737, RTR-NUREG-737 GL-82-33, PROC-840301, NUDOCS 8403060116
Download: ML17215A270 (13)

Text

SAFETYPARAMETER DISPLAYSYSTEMPARAMETER SELECTION EVALUATION ANDIMPLEMENTATION PLAN,.04080Ei0110i 84030'DRADOCK05000335F...PDR h

SPDSPage2of6I.DESCRIPTI0NThepurposeoftheSafetyParameter DisplaySystem(SPDS)istoassistcontrolroompersonnel inevaluating thesafetystatusoftheplant.'he SPDSatSt.Lucieprovidesacontinuous displayofawidevarietyofplantparameters ona19"CRTcentrally locatedinthecontrolroom.InputstotheSt.LucieSPDSareobtainedviaexistingplantinstrumentation, processed throughacentralcomputer, andthendisplayed onCRTs.TherearethreeprimarydisplaysthatmaybeshownontheCRTs,oneforeachmajormodeofoperation

-normal,heatup/cooldown, andshutdowncoolingmodes.Thenecessary plantparameters aredisplayed ineach'modetoallowthecontrolroomoperatortoadequately assessplantsafetystatusforavarietyofnormalandabnormalplantoperating conditions.

Supplementalparametersandtrendinginformation canalsobedisplayed.

Alistingofchosenparameters fortheprimarydisplaysissuppliedinTable1.II.BASISFORPARANETER SELECTION NRCGenericLetter82-33entitled"Supplement1toNUREG-0737RequirementsforEmergencyResponseCapability" requiresthat,asaminimum,theSP0Sshouldprovideinformation toplantoperators about:i)-)iii)iv)v)Reactivity ControlReactorcorecoolingandheatremovalfromtheprimarysystemReactorcoolantsystemintegrity Radioactivity controlContainment Integrity Additional guidanceusedtoselectSPDSparameters wasobtainedfromworkperformed byautilityownersgroup,Regulatory Guide1.97,andoperating experience.

Thebasisfortheparameters selectedtomeettherequirements ofeachofthefiveareasidentified inGenericLetter82-33isasfollows:Reactivit ControlThepurposeofmonitoring areactivity controiparameteristoprovidetotheoperatorthestatusoffluxconditions withinthereactorcore.Inorder.toassessthereactorcorefluxconditions itisnecessary tomonltotreactorpowerinallrangesandrateofchangeofpower.Therefore, theSPDSmonitorsthestartuprange,widerangelogarithmic andpowerrangenuclearinstruments.

Thisprovidesthemeanstomonitorcore.fluxconditions throughout allrangesofreactoroperation.

Changesinfluxconditions aremonitored'on theSPDSbythestartuprateindication.

Inadditiontotheseparameters, reactortripstatusisalsodisplayed toprovidetheoperatoradditional information onreactivity controlsystemsstatus.TheSPDS'monitors corepower,startuprate,andreactortripstatus.Basedontheaboveevaluation, theseparameters aresufficient toprovidetheoperatorwithindication ofreactivitiy controlforarangeofplantconditions.

SPDSPage3of62.ReactorCoreCoolinandHeatRemovalfromthePrimarSstemTheobjective inthisareaistoprovidesufficient indication suchthatanoperatorcandetermine, ifthereactorcoreisbeingadequately cooledandheatisbeingcontinuously removedfromthissystem.Toensureadequatecorecoolingandheatremoval,itisnecessary toensurethereisflowthroughthecoreandthataheatsinkisavailable toremoveheatfromthecore.Therearethreeseparatecasesthatmustmeetthesecriteria:

RCSintegrity maintained, lossofRCSintegrity, andshutdowncooling.'IInthecasewhereRCSintegrity ismaintained, flowthroughthecoremustfirstbeestablished.

Coreexittemperatures andcoldlegtemperatures aremonitored onSPDStoassurethatthereisadifferential temperature acrossthecoreandheatisbeingremoved.Subcooling marginassuresthereisnovoidformation thatmightimpedenaturalcirculation throughthecorewhenthereisnoforcedflow.Theprimaryheatsinkforthiscasewouldbethesteamgenerators.

Steamgenerator levelsandpressures provideindication thatthesteamgenerators areavailable asprimaryheatsinks.InthecasewhereRCSintegrity isnotmaintained (i.e.,LOCA)theSafetyInjection Actuation messageonSPDSindicates thatcoolingwaterisgoingtothereactorcoolantsystem.Coreexittemperatures aremonitored toassurethatheatisbeingremoved.Thereactorvessellevelmonitorindicates theextenttowhichthecoreiscoveredwithwater.Finally,forthespecialcaseofshutdowncooling,aseparatedisplayprovidesindication ofshutdowncoolingflowandtemperatures.

This,combinedwithcoreexittemperatures, isapositiveindication ofheatremoval.Thesemonitored parameters-coreexittemperature,coldlegtemperatures, subcooled margin,steamgenerator level,steamgenerator

pressure, reactorvessellevel,shutdowncoolingtemperatures andflowandthesafetyinjection actuation message-aresufficient fortheoperatortoassessreactorcorecoolingforarangeofplantconditions.

30RCSInteritTheobjective ofthisareaistoprovidesufficient indication suchthatanoperator'candetermine

'ifallprimarycoolantsystemboundaries areintact,thusmaintaining coolantinventory forcorecooling.RCSintegrity maybebreachedeitherintheformofaLossOfCoolantAccident(LOCA)tocontainment orasaSteamGenerator TubeRupture(SGTR).Pressurizer level,pressurizer pressureandreactorvessellevelareusedtoprovidetheoperatorwithindication ofaproperlymaintained ReactorCoolantSystemboundary.

SPDSPage4of6Additional indication ofafailureofRCSintegrity intheformofaLOCAcanbedetermined bycontainment radiation orbythecontainment environment indication.

Thecontainment environment indication willalarmifanyofitsinputparameters

-containment temperature, pressureorsumplevel-exceedsetlimits.Indication ofafailureofRCSintegrity intheformofaSteamGenerator TubeRupture(SGTR)isprovidedbysteamgenerator levelsandpressures andbythesecondary radiation indication.

Risingsteamgenerator levelisoneindication ofanSGTR.Thesecondary radiation indication willalarmifeitherofitsinputs,thesteamgenerator blowdownradiation orairejectorradiation

monitors, exceedssetlimits.ASGTRcouldcauseasecondary radiation alarm.Additionally, chargingandletdownsystemflowsarealsodisplayed.

Increased chargingflowisthefirstsignofasmallbreachinRCSintegrity.

Thesemonitored parameters-pressurizer

pressure, pressurizer level,reactorvessellevel,containment environment, containment radiation, secondary radiation, steamgenerator levels,steamgenerator pressures, andchargingandletdownflows-aresufficient toassessRCSintegrity forarangeofoperating conditions.

RadioactivitControlTheobjective ofthisareaistoprovidesufficient indication suchthatanoperatorcandetermine thatnoradioactive substances arebeingreleasedtotheenvironment inanuncontrolled manner.Radioactive productscanbereleasedfromtheRCSintoeitherthecontainment duringaLOCAorintothesecondary sideduringasteamgenerator tuberupture.Radioactivity controlis,therefore, monitored intwoways,bythecontainment radiation indication andbythesecondary radiation indication.

Containment radiation issuppliedasadigitalindication from1to108R/hr.,Ahighradiation signalalsocausesacontainment isolation signaltobeinitiated topreventuncontrolled releasetotheenvironment.Thesecondary radiation indication willalarmifeitherofitsmonitored inputs-airejectorradiation orsteamgenerator blowdownradiation-exceedsspecified lim,its.Theseindications

-containment radiation andsecondary radiation-providetheoperatorwithindication ofanypotential uncontrolled

'radiation release.

SPDSPage5of65Containment InteritTheobjective ofthisareaistoprovidesufficient indication suchthatanoperatorcandetermine ifacontainment boundaryisbeingmaintained tocontrolradioactive substances duringandfollowing aLossofCoolantAccident(LOCA).Todothis,challenges tothecontainment mustbemonitored.

Challenges tothecontainment aremonitored viathecontainment environment indication.

Thecontaiment environment indication isaderivedparameter usingcontainment temperature,

pressure, andsumplevelasinputs.Shouldanyoftheseparameters gooutofestablished limits,analarmwilloccur.Thisprovidesanindication thatcontainment integrity isbeingchallenged, andcorrective actionsshouldbetakenbytheoperator.

Themessagefora-SafetyInjection Actuation Signal(SIAS)onthedisplaywillinferthataContainment Isolation Signal(CIS)hasbeeninitiated (CISoccursonSIAS).Theseindications

-containment environment andSafetyInjection actuation

-inconjunction withtheRCSintegrity parameters providetheessential information toassesscontainment integrity.

Basedontheaboveinformation, theSPDSdisplaysprovidesufficient information forthecontrolroomoperatortoassessplantstatusduringheatup-cooldown, normaloperation, shutdownoperation, andforawiderangeofpostulated plantaccidents including HainSteamLineBreaks(HSL6),LOCA's,SGTR's,andBoronDilutionEvents.III.SAFETYANALYSISTheSafetyParameter DisplaySystemisanonwafety, non-seismic system(withtheexception oftheisolation system).Itisapassive,monitoring andindication systemonly,anddoesnotinteractwiththeautomatic initiation ofanyprotection system.Allmodifications tosafety-class IEcircuitswhereSPDSinputsareobtainedsatisfytheisolation and'qualification requirements ofFSARSection7.1and7.5.OnlySafetyClassIEequipment isusedandseparation isprovidedbyroutingwiresthroughtotallyenclosedmetallicwirewaysdedicated toeachsafetydivisionandterminating intheClassIETermination Cabinets.

Furthermore, allinterface betweensafetyandnon-safety signalsarethrough:,.isolation devicesfully,qualified andinstalled toIEEE-323-1974 andIEEE-344-1975standards.

Finally,implementation oftheSPDSwillrequirenochangestotheplant'sTechnical Specifications.

Basedontheaboveinformation, ithasbeendetermined thatinstallation andoperation oftheSPDSdoesnotconstitute anunreviewed safetyquestioninaccordance with10CFR50.59.

SPDSPage6of6IV.IHPLEHENTATI0NInFPLletterL-83-236, datedApril15,1983,FPLcommitted tohavetheSafetyParameter DisplaySystem(SPDS)fullyoperable, including trainingofoperators, bytheFall1984outageatSt.LucieUnit1.DuetotheextendedoutageatSt.Lucie1toremovetheThermalShield,thenextoutageatUnit1isnotplanneduntilFall1985(cycle7).BecausetheSPDSinstallation canonlybecompleted duringaplantoutage,finalcompletion oftheSPDSwillbedelayeduntilFall1985.Therefore, FPLwillhavetheSPDSfullyoperable, including trainingofoperators, priortostartupfollowing theFall1985outageatSt.LucieUnit1.

ST.LUCIEPLANTUNITNO.1NUREG0696-'UNCTIONAL CRITERIAFOREMERGENCY RESPONSEFACILITIES SAFETYPARAMETER DISPLAYSYSTEM(SPDS)PARAMETER SELECTION KEYPARAMETERS TABLE1REMARKSPage1PLANTFUNCTIONDESCRIPTION RANGETYPELOCATIONOFPARA-DISPLAYTYPEe.g.NUMBEROFMETERONDISPLAYTARGET,BARGRAPHINSTRUHENTS USEDCPSSourceRangePowerLevel(Startup) 101to104CPSDirectAverageBelowTitleDigitalValue4REACTIVITY CONTROLPercentWideRangePower(Logrithmic)

PercentPower(Linear)StartupRateReactorTripSignal1x108ampsto15040to1254-1to7dpmDirectAverageDirectAverageDirectAverageCalculatedBelowTitleBelowTitleMessageAreaLine6MessageAreaLine7DigitalValue4DigitalValue4DigitalValue4"'Message ColdLegTemperature 212oto705oFDirectAverageTopRowRightBarGraph6DigitalValueWideRangeWR)4NarrowRange(NRCoreExitTemperatureFeedwater Isolation SignalAFB32to2300oFDirectAverageThisisaderivedpara-meterusingAFASASB,HSISASB,andSIASASBBottomRowRightMessageAreaLine9DigitalValueMessage45Thermocouples (TC's)6Digital~ContactInputsREACTORCORECOOLINGANDHEATREMOVALFROMTHEPRIMARYSYSTEMMainSteamIsolation Signal(MSIS)ASBDirectHessageAreaLine8RCSAverageTemperature Aderivedparameter MessageAreafromHot6ColdLegTemp.Line5Message4WRColdLeg4WRHotLegDigitaIValue4NRCoIdLeg4NRHotLeg

ST.LUCIEPLANTUNITNO.1'UREG0696-FUNCTIONAL CRITERIAFOREMERGENCY RESPONSEFACILITIES SAFETYPARAMETER DISPLAYSYSTEM(SPDS)PARAMETER SELECTION TABLE1Page2PLANTFUNCTIONKEYPARAMETERS DESCRIPTION RANGEREMARKSTYPELOCATIONOFPARA-DISPLAYTYPEe.g.NUMBEROF'HETERONDISPLAYTARGET,BARGRAPHINSTRUMENTS USEDReactorVesselLevel0to1004LowestBottomRowCenterTarget1forChannelA1forChannelBREACTORCORECOOLINGANDHEATREMOVALFROMTHEPRIMARYSYSTEMShutdownCooling(SDC)FlowSDCfrom.RCS(Temp.)SDCtoRCS(Temp.)SafetyInjection Actuation Signal(SIAS)0to8000gpm0to400oF0to400oFDirectDirectDirectDirectCenterSectionCenter/Left SectionCenter/Left SectionMessageAreaLine10BarGraphSDigitalValueBarGraph6Digita1Va1ueBarGraph6DigitalValueMessage2DigitalContactsSteamGenerator (S/G)LeveIsA6BS/GPressureA6B0to10040to1200AverageCenterSectionAverageCenterSectionBarGraph6DigitalValueBarGraph8DigitalValue4NRS/GA4NRS/GB3S/GA3S/GBRCSINTEGRITY Subcooling ChargingFl'owContainment Environment 700to-2100oFLowest(subcooled tosuperheat) 0to150gpmDirectAderivedpararneterusingcontainment

pressure, temperature, levelBottomRowRightMiddleRow/LeftBottomRowTargetBarGraph6DigitalValueTargetCont.Level2Cont.Press.8Cont.Temp.1 ST.LUGIEPLANTUNITNO.1NUREG0696-FUNCTIONAL CRITERIAFOREMERGENCY RESPONSEFACILITIES SAFETYPARAMETER DISPLAYSYSTEM(SPDS)PARAMETER SELECTION KEYPARAMETERS TABLE1REMARKSPage3PLANTFUNCTIONDESCRIPTION RANGETYPELOCATIONOFPARA-DISPLAYTYPEe.g.NUMBEROFMETERONDISPLAYTARGET,BARGRAPHINSTRUMENTS USEDContainmentRadiation CoreExitTemperature LetdownFlow10oto108R/HR32to2300oF0to140gpmAverageDirectAverageDirectBottomRowBottomRowRightMiddleRow/LeftDigitalValue2LowRange'WideRangeDigitalValue45TC'sBarGraph6DigitalValuePressurizer Level0to1004AverageTopRowCenterBarGraphSDigitalValueRCSINTEGRITY Pressurizer Pressure0to1600psiaDirectTopRowBarGraph6DigitalValueRCSAverageTemperature DerivedfromHot6ColdLegTemps.MessageAreaLine5DigitalValue4WRCoIdLeg4WRHotLeg4NRColdLeg4NRHotLegRCSPressure-0to3000psiaCalculated TopRowBarGraph6DigitalValue4NarrowRange2WideRangeReactorVesselLevel0to1004LowestBottomRowCenterDigitalValue1-Ch.A1-Ch.BSecondary Radiatio~

S/GLevelAGBS/GPressureDerivedfromS/GBlowdown6AirEjectorRadiation 0to1004Average0to1200psiaAverageBottomRowLeftCente'rSectionCenterSectionTargetBarGraphSDigitalValueBarGraph6DigitalValue1-AirEjector2-S/GBlowdown4NRS/GA4NRS/GB3S/GA3S/GB ST.LUCIEPLANTUNITNO-1NUREG0696-FUNCTIONAL CRITERIAFOREMERGENCY RESPONSEFACILITIES SAFETYPARAMETER DISPLAYSYSTEM(SPDS)PARAMETER SELECTION TABLE1Page4PLANTFUNCTION-KEYPARAMETERS DESCRIPTION RANGEREHARKSTYPELOCATIONOFPARA-DISPLAYTYPEe.g.NUHBEROFHETERONDISPLAYTARGET,BARGRAPHINSTRUMENTS USEDRADIOACTIVTYContainment'RadiationCONTROLSecondary Radiation 100to108R/HRDerivedfromS/GBlowdown6AirEjectorRadiation AverageBottomRowCalculatedBottomRowDigitalValueTarget2LowRange2WideRangeAirEjector1S/GBlowdownCONTAINMENT INTEGRITY Containment Environment Aderivedparameter usingcontainment temperature,

pressure, 6levelBottomRowTargetCont.Level2Cont.Press.8Cont.Temp.1 vr