ML17215A270: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(Created page by program invented by StriderTol)
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:SAFETYPARAMETER DISPLAYSYSTEMPARAMETER SELECTION EVALUATION ANDIMPLEMENTATION PLAN,.04080Ei0110i 84030'DRADOCK05000335F...PDR h
{{#Wiki_filter:SAFETY PARAMETER DISPLAY SYSTEM PARAMETER SELECTION EVALUATION AND IMPLEMENTATION PLAN ,.04080Ei0110i 84030'DR ADOCK 05000335 F...PDR h
SPDSPage2of6I.DESCRIPTI0NThepurposeoftheSafetyParameter DisplaySystem(SPDS)istoassistcontrolroompersonnel inevaluating thesafetystatusoftheplant.'he SPDSatSt.Lucieprovidesacontinuous displayofawidevarietyofplantparameters ona19"CRTcentrally locatedinthecontrolroom.InputstotheSt.LucieSPDSareobtainedviaexistingplantinstrumentation, processed throughacentralcomputer, andthendisplayed onCRTs.TherearethreeprimarydisplaysthatmaybeshownontheCRTs,oneforeachmajormodeofoperation
SPDS Page 2 of 6 I.D ESC RIPTI 0 N The purpose of the Safety Parameter Display System (SPDS)is to assist control room personnel in evaluating the safety status of the plant.'he SPDS at St.Lucie provides a continuous display of a wide variety of plant parameters on a 19" C RT centrally located in the control room.Inputs to the St.Lucie SPDS are obtained via existing plant instrumentation, processed through a central computer, and then displayed on C RTs.There are three primary displays that may be shown on the CRTs, one for each major mode of operation-normal, heatup/cooldown, and shutdown cooling modes.The necessary plant parameters are displayed in each'mode to allow the control room operator to adequately assess plant safety status for a variety of normal and abnormal plant operating conditions.
-normal,heatup/cooldown, andshutdowncoolingmodes.Thenecessary plantparameters aredisplayed ineach'modetoallowthecontrolroomoperatortoadequately assessplantsafetystatusforavarietyofnormalandabnormalplantoperating conditions.
Supple mental para meters and trending information can also be displayed.
Supplementalparametersandtrendinginformation canalsobedisplayed.
A listing of chosen parameters for the primary displays is supplied in Table 1.II.BASIS FOR PARANETER SELECTION N R C Generic Letter 82-33 entitled"Supple ment 1 to N U R E G-0737 Require m ents for E m ergency Response C apability" requires that, as a minimum, the SP 0 S should provide information to plant operators about: i)-)iii)iv)v)Reactivity Control Reactor core cooling and heat removal from the primary system Reactor coolant syste m integrity Radioactivity control Containment Integrity Additional guidance used to select SP DS parameters was obtained from work performed by a utility owners group, Regulatory Guide 1.97, and operating experience.
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.
The basis for the parameters selected to meet the requirements of each of the five areas identified in Generic Letter 82-33 is as follows: Reactivit Control The purpose of monitoring a reactivity controi para meter is to provide to the operator the status of flux conditions within the reactor core.In order.to assess the reactor core flux conditions it is necessary to monltot reactor power in all ranges and rate of change of power.Therefore, the SPDS monitors the startup range, wide range logarithmic and power range nuclear instruments.
Thebasisfortheparameters selectedtomeettherequirements ofeachofthefiveareasidentified inGenericLetter82-33isasfollows:Reactivit ControlThepurposeofmonitoring areactivity controiparameteristoprovidetotheoperatorthestatusoffluxconditions withinthereactorcore.Inorder.toassessthereactorcorefluxconditions itisnecessary tomonltotreactorpowerinallrangesandrateofchangeofpower.Therefore, theSPDSmonitorsthestartuprange,widerangelogarithmic andpowerrangenuclearinstruments.
This provides the means to monitor core.flux conditions throughout all ranges of reactor operation.
Thisprovidesthemeanstomonitorcore.fluxconditions throughout allrangesofreactoroperation.
Changes in flux conditions are monitored'on the SPDS by the startup rate indication.
Changesinfluxconditions aremonitored'on theSPDSbythestartuprateindication.
In addition to these parameters, reactor trip status is also displayed to provide the operator additional information on reactivity control syste ms status.The SPDS'monitors core power, startup rate, and reactor trip status.Based on the above evaluation, these parameters are sufficient to provide the operator with indication of reactivitiy control for a range of plant conditions.
Inadditiontotheseparameters, reactortripstatusisalsodisplayed toprovidetheoperatoradditional information onreactivity controlsystemsstatus.TheSPDS'monitors corepower,startuprate,andreactortripstatus.Basedontheaboveevaluation, theseparameters aresufficient toprovidetheoperatorwithindication ofreactivitiy controlforarangeofplantconditions.
SP DS Page 3 of 6 2.Reactor Core Coolin and Heat Removal from the Primar S stem The objective in this area is to provide sufficient indication such that an operator can determine, if the reactor core is being adequately cooled and heat is being continuously removed from this system.To ensure adequate core cooling and heat removal, it is necessary to ensure there is flow through the core and that a heat sink is available to remove heat from the core.There are three separate cases that must meet these criteria: RCS integrity maintained, loss of RCS integrity, and shutdown cooling.'I In the case where RCS integrity is maintained, flow through the core must first be established.
SPDSPage3of62.ReactorCoreCoolinandHeatRemovalfromthePrimarSstemTheobjective inthisareaistoprovidesufficient indication suchthatanoperatorcandetermine, ifthereactorcoreisbeingadequately cooledandheatisbeingcontinuously removedfromthissystem.Toensureadequatecorecoolingandheatremoval,itisnecessary toensurethereisflowthroughthecoreandthataheatsinkisavailable toremoveheatfromthecore.Therearethreeseparatecasesthatmustmeetthesecriteria:
Core exit temperatures and cold leg temperatures are monitored on SPDS to assure that there is a differential temperature across the core and heat is being removed.Subcooling margin assures there is no void formation that might impede natural circulation through the core when there is no forced flow.The primary heat sink for this case would be the steam generators.
RCSintegrity maintained, lossofRCSintegrity, andshutdowncooling.'IInthecasewhereRCSintegrity ismaintained, flowthroughthecoremustfirstbeestablished.
Steam generator levels and pressures provide indication that the steam generators are available as primary heat sinks.In the case where RCS integrity is not maintained (i.e., LOCA)the Safety Injection Actuation message on SPDS indicates that cooling water is going to the reactor coolant system.Core exit temperatures are monitored to assure that heat is being removed.The reactor vessel level monitor indicates the extent to which the core is covered with water.Finally, for the special case of shutdown cooling, a separate display provides indication of shutdown cooling flow and temperatures.
Coreexittemperatures andcoldlegtemperatures aremonitored onSPDStoassurethatthereisadifferential temperature acrossthecoreandheatisbeingremoved.Subcooling marginassuresthereisnovoidformation thatmightimpedenaturalcirculation throughthecorewhenthereisnoforcedflow.Theprimaryheatsinkforthiscasewouldbethesteamgenerators.
This, combined with core exit temperatures, is a positive indication of heat re m oval.These monitored para m e ters-core exit te m p era ture, cold leg te mperatures, subcooled margin, stea m generator level, stea m generator pressure, reactor vessel level, shutdown cooling temperatures and flow and the safety injection actuation message-are sufficient for the operator to assess reactor core cooling for a range of plant conditions.
Steamgenerator levelsandpressures provideindication thatthesteamgenerators areavailable asprimaryheatsinks.InthecasewhereRCSintegrity isnotmaintained (i.e.,LOCA)theSafetyInjection Actuation messageonSPDSindicates thatcoolingwaterisgoingtothereactorcoolantsystem.Coreexittemperatures aremonitored toassurethatheatisbeingremoved.Thereactorvessellevelmonitorindicates theextenttowhichthecoreiscoveredwithwater.Finally,forthespecialcaseofshutdowncooling,aseparatedisplayprovidesindication ofshutdowncoolingflowandtemperatures.
30 RCS Inte rit The objective of this area is to provide sufficient indication such that an operator'can determine'if all primary coolant system boundaries are intact, thus maintaining coolant inventory for core cooling.RCS integrity may be breached either in the form of a Loss Of Coolant Accident (LO CA)to containment or as a Steam Generator Tube Rupture (SG T R).Pressurizer level, pressurizer pressure and reactor vessel level are used to provide the operator with indication of a properly maintained Reactor Coolant Syste m boundary.
This,combinedwithcoreexittemperatures, isapositiveindication ofheatremoval.Thesemonitored parameters-coreexittemperature,coldlegtemperatures, subcooled margin,steamgenerator level,steamgenerator
SP DS Page 4 of 6 Additional indication of a failure of RCS integrity in the form of a LO CA can be determined by containment radiation or by the containment environment indication.
: pressure, reactorvessellevel,shutdowncoolingtemperatures andflowandthesafetyinjection actuation message-aresufficient fortheoperatortoassessreactorcorecoolingforarangeofplantconditions.
The containment environment indication will alarm if any of its input parameters
30RCSInteritTheobjective ofthisareaistoprovidesufficient indication suchthatanoperator'candetermine
-containment te mperature, pressure or sump level-exceed set limits.Indication of a failure of RCS integrity in the form of a Steam Generator Tube Rupture (SGTR)is provided by steam generator levels and pressures and by the secondary radiation indication.
'ifallprimarycoolantsystemboundaries areintact,thusmaintaining coolantinventory forcorecooling.RCSintegrity maybebreachedeitherintheformofaLossOfCoolantAccident(LOCA)tocontainment orasaSteamGenerator TubeRupture(SGTR).Pressurizer level,pressurizer pressureandreactorvessellevelareusedtoprovidetheoperatorwithindication ofaproperlymaintained ReactorCoolantSystemboundary.
Rising steam generator level is one indication of an SGTR.The secondary radiation indication will alarm if either of its inputs, the steam generator blowdown radiation or air ejector radiation monitors, exceeds set limits.A SGTR could cause a secondary radiation alarm.Additionally, charging and letdown system flows are also displayed.
SPDSPage4of6Additional indication ofafailureofRCSintegrity intheformofaLOCAcanbedetermined bycontainment radiation orbythecontainment environment indication.
Increased charging flow is the first sign of a small breach in RCS integrity.
Thecontainment environment indication willalarmifanyofitsinputparameters
These monitored para meters-pressurizer pressure, pressurizer level, reactor vessel level, containment environment, containment radiation, secondary radiation, stea m generator levels, stea m generator pressures, and charging and letdown flows-are sufficient to assess R CS integrity for a range of operating conditions.
-containment temperature, pressureorsumplevel-exceedsetlimits.Indication ofafailureofRCSintegrity intheformofaSteamGenerator TubeRupture(SGTR)isprovidedbysteamgenerator levelsandpressures andbythesecondary radiation indication.
R adioac tiv it Control The objective of this area is to provide sufficient indication such that an operator can determine that no radioactive substances are being released to the environment in an uncontrolled manner.Radioactive products can be released from the RCS into either the containment during a LOCA or into the secondary side during a steam generator tube rupture.Radioactivity control is, therefore, monitored in two ways, by the containment radiation indication and by the secondary radiation indication.
Risingsteamgenerator levelisoneindication ofanSGTR.Thesecondary radiation indication willalarmifeitherofitsinputs,thesteamgenerator blowdownradiation orairejectorradiation
Containment radiation is supplied as a digital indication from 1 to 108 R/hr.,A high radiation signal also causes a containment isolation signal to be initiated to prevent uncontrolled release to the environm ent.The secondary radiation indication will alarm if either of its monitored inputs-air ejector radiation or steam generator blowdown radiation-exceeds specified lim,its.These indications
: monitors, exceedssetlimits.ASGTRcouldcauseasecondary radiation alarm.Additionally, chargingandletdownsystemflowsarealsodisplayed.
-containment radiation and secondary radiation-provide the operator with indication of any potential uncontrolled
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.
'radiation release.
SPDSPage5of65Containment InteritTheobjective ofthisareaistoprovidesufficient indication suchthatanoperatorcandetermine ifacontainment boundaryisbeingmaintained tocontrolradioactive substances duringandfollowing aLossofCoolantAccident(LOCA).Todothis,challenges tothecontainment mustbemonitored.
SP DS Page 5 of 6 5 Containment Inte rit The objective of this area is to provide sufficient indication such that an operator can determine if a containment boundary is being maintained to control radioactive substances during and following a Loss of Coolant Accident (LOCA).To do this, challenges to the containment must be monitored.
Challenges tothecontainment aremonitored viathecontainment environment indication.
Challenges to the containment are monitored via the containment environment indication.
Thecontaiment environment indication isaderivedparameter usingcontainment temperature,
The contaiment environment indication is a derived parameter using containment temperature, pressure, and sump level as inputs.Should any of these parameters go out of established limits, an alarm will occur.This provides an indication that containment integrity is being challenged, and corrective actions should be taken by the operator.The message for a-Safety Injection Actuation Signal (SIAS)on the display will infer that a Containment Isolation Signal (C IS)has been initiated (C IS occurs on SI AS).These indications
: pressure, andsumplevelasinputs.Shouldanyoftheseparameters gooutofestablished limits,analarmwilloccur.Thisprovidesanindication thatcontainment integrity isbeingchallenged, andcorrective actionsshouldbetakenbytheoperator.
-containment environment and Safety Injection actuation-in conjunction with the RCS integrity parameters provide the essential information to assess containment integrity.
Themessagefora-SafetyInjection Actuation Signal(SIAS)onthedisplaywillinferthataContainment Isolation Signal(CIS)hasbeeninitiated (CISoccursonSIAS).Theseindications
Based on the above information, the SP D S displays provide sufficient information for the control room operator to assess plant status during heatup-cooldown, normal operation, shutdown operation, and for a wide range of postulated plant accidents including Hain Steam Line Breaks (HSL6), LO CA's, SG TR's, and Boron Dilution Events.III.SAFETY ANALYSIS The Safety Parameter Display System is a nonwafety, non-seismic system (with the exception of the isolation system).It is a passive, monitoring and indication system only, and does not interact with the automatic initiation of any protection system.All modifications to safety-class IE circuits where SPDS inputs are obtained satisfy the isolation and'qualification requirements of FSAR Section 7.1 and 7.5.Only Safety Class IE equipment is used and separation is provided by routing wires through totally enclosed metallic wireways dedicated to each safety division and terminating in the Class IE Termination Cabinets.Furthermore, all interface between safety and non-safety signals are through:,.isolation devices fully, qualified and installed to IEEE-323-1974 and IEEE-344-1975 standards.
-containment environment andSafetyInjection actuation
Finally, implementation of the SPDS will require no changes to the plant's Technical Spec if ications.Based on the above information, it has been determined that installation and operation of the SPDS does not constitute an unreviewed safety question in accordance with 10 C F R50.59.
-inconjunction withtheRCSintegrity parameters providetheessential information toassesscontainment integrity.
SP DS Page 6 of 6 I V.I H PL E H E N T A TI 0 N In FPL letter L-83-236, dated April 15, 1983, FPL committed to have the Safety Parameter Display System (SPDS)fully operable, including training of operators, by the Fall 1984 outage at St.Lucie Unit 1.Due to the extended outage at St.Lucie 1 to remove the Thermal Shield, the next outage at Unit 1 is not planned until Fall 1985 (cycle 7).Because the SPDS installation can only be completed during a plant outage, final completion of the SPDS will be delayed until Fall 1985.Therefore, FPL will have the SPDS fully operable, including training of operators, prior to startup following the Fall 1985 outage at St.Lucie Unit 1.
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.
ST.LUCIE PLANT UNIT NO.1 NUREG 0696-'UNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION KEY PARAMETERS TABLE 1 REMARKS Page 1 PLANT FUNCTION DESCRIPTION RANGE TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF METER ON DISPLAY TARGET, BAR GRAPH INSTRUHENTS USED CPS Source Range Power Level (Startup)10 1 to 104 CPS Direct Average Below Ti t le Digital Value 4 REACTIVITY CONTROL Percent Wide Range Power (Logrithmic)
Furthermore, allinterface betweensafetyandnon-safety signalsarethrough:,.isolation devicesfully,qualified andinstalled toIEEE-323-1974 andIEEE-344-1975standards.
Percent Power (Linear)Startup Rate Reactor Trip Signal 1x10 8 amps to 1504 0 to 1254-1 to 7 dpm Direct Average Direct Average Direct Average Ca l cu lated Below Title Below Title Message Area Line 6 Message Area Line 7 Digital Value 4 Digital Value 4 Digital Value 4"'Message Cold Leg Temperature 212o to 705oF Direct Average Top Row Right Bar Graph 6 Digital Value Wide Range WR)4 Narrow Range (NR Core Ex i t Tempera ture Feedwater Isolation Signal AFB 32 to 2300oF Direct Average This is a derived para-meter using AFAS ASB, HSIS ASB, and SIAS ASB Bottom Row Right Message Area Line 9 Digital Value Message 45 Thermocouples (TC's)6 Digital~Contact Inputs REACTOR CORE COOLING AND HEAT REMOVAL FROM THE PRIMARY SYSTEM Main Steam Isolation Signal (MSIS)ASB Direct Hessage Area Line 8 RCS Average Temperature A derived parameter Message Area from Hot 6 Cold Leg Temp.Line 5 Message 4 WR Co ld Leg 4 WR Hot Leg D i g i ta I Va lue 4 NR Co I d Leg 4 NR Hot Leg
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
ST.LUCIE PLANT UNIT NO.1'UREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION TABLE 1 Page 2 PLANT FUNCTION KEY PARAMETERS DESCRIPTION RANGE REMARKS TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF'HETER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED Reactor Vessel Level 0 to 1004 Lowest Bottom Row Center Target 1 for Channel A 1 for Channel B REACTOR CORE COOLING AND HEAT REMOVAL FROM THE PRIMARY SYSTEM Shutdown Cooling (SDC)Flow SDC from.RCS (Temp.)SDC to RCS (Temp.)Safety Injection Actuation Signal (SIAS)0 to 8000 gpm 0 to 400oF 0 to 400oF Direct Direct Direct Direct Center Section Center/Left Section Center/Left Section Message Area Line 10 Bar Graph S Dig i ta l Va lue Bar Graph 6 D i g i ta 1 Va 1ue Bar Graph 6 Digital Value Message 2 Digital Contacts Steam Generator (S/G)Leve Is A 6 B S/G Pressure A 6 B 0 to 1004 0 to 1200 Average Center Section Average Center Section Bar Graph 6 Digital Value Bar Graph 8 Digital Value 4 NR S/G A 4 NR S/G B 3S/G A 3 S/G B RCS INTEGRITY Subcooling Charging Fl'ow Containment Environment 700 to-2100oF Lowest (subcooled to superheat) 0 to 150 gpm Direct A der i ved par arne te r using containment pressure, temperature, level Bottom Row Right Middle Row/Left Bottom Row Target Bar Graph 6 Digital Value Target Cont.Level 2 Cont.Press.8 Cont.Temp.1 ST.LUG I E PLANT UNIT NO.1 NUREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION KEY PARAMETERS TABLE 1 REMARKS Page 3 PLANT FUNCTION DESCRIPTION RANGE TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF METER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED Conta inment Radiation Core Exit Temperature Letdown Flow 10o to 108 R/HR 32 to 2300oF 0 to 140 gpm Average Direct Average Direct Bottom Row Bot tom Row Right Middle Row/Left Digital Value 2 Low Range'Wide Range Digital Value 45 TC's Bar Graph 6 Digital Value Pressurizer Level 0 to 1004 Average Top Row Center Bar Graph S Digital Value RCS INTEGRITY Pressurizer Pressure 0 to 1600 psia Direct Top Row Bar Graph 6 Digital Value RCS Average Temperature Derived from Hot 6 Cold Leg Temps.Message Area Line 5 Digital Value 4 WR Co I d Leg 4 WR Hot Leg 4 NR Cold Leg 4 NR Hot Leg RCS Pressure-0 to 3000 psia Calculated Top Row Bar Graph 6 Digital Value 4 Narrow Range 2 Wide Range Reactor Vessel Level 0 to 1004 Lowest Bottom Row Center Digital Value 1-Ch.A 1-Ch.B Secondary Radiatio~S/G Level AGB S/G Pressure Derived from S/G Blowdown 6 Air Ejector Radiation 0 to 1004 Average 0 to 1200 psia Average Bottom Row Left Cente'r Section Center Section Target Bar Graph S Digital Value Bar Graph 6 Digital Value 1-Air Ejector 2-S/G B lowdown 4 NR S/G A 4 NR S/G B 3 S/G A 3 S/G B ST.LUCIE PLANT UNIT NO-1 NUREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION TABLE 1 Page 4 PLANT FUNCTION-KEY PARAMETERS DESCRIPTION RANGE REHARKS TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUHBER OF HETER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED RAD IOACTI VTY Conta inment'Radiat ion CONTROL Secondary Radiation 100 to 108 R/HR Derived from S/G Blowdown 6 Air Ejector Radiation Average Bottom Row Ca lcu lated Bottom Row Digital Value Target 2 Low Range 2 Wide Range Air Ejector 1 S/G Blowdown CONTAINMENT INTEGRITY Containment Environment A derived parameter using containment temperature, pressure, 6 level Bottom Row Target Cont.Level 2 Cont.Press.8 Cont.Temp.1 vr}}
: 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}}

Revision as of 17:25, 7 July 2018

Safety Parameter Display Sys Parameter Selection Evaluation & Implementation Plan.
ML17215A270
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 03/01/1984
From:
FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17215A269 List:
References
RTR-NUREG-0737, RTR-NUREG-737 GL-82-33, PROC-840301, NUDOCS 8403060116
Download: ML17215A270 (13)


Text

SAFETY PARAMETER DISPLAY SYSTEM PARAMETER SELECTION EVALUATION AND IMPLEMENTATION PLAN ,.04080Ei0110i 84030'DR ADOCK 05000335 F...PDR h

SPDS Page 2 of 6 I.D ESC RIPTI 0 N The purpose of the Safety Parameter Display System (SPDS)is to assist control room personnel in evaluating the safety status of the plant.'he SPDS at St.Lucie provides a continuous display of a wide variety of plant parameters on a 19" C RT centrally located in the control room.Inputs to the St.Lucie SPDS are obtained via existing plant instrumentation, processed through a central computer, and then displayed on C RTs.There are three primary displays that may be shown on the CRTs, one for each major mode of operation-normal, heatup/cooldown, and shutdown cooling modes.The necessary plant parameters are displayed in each'mode to allow the control room operator to adequately assess plant safety status for a variety of normal and abnormal plant operating conditions.

Supple mental para meters and trending information can also be displayed.

A listing of chosen parameters for the primary displays is supplied in Table 1.II.BASIS FOR PARANETER SELECTION N R C Generic Letter 82-33 entitled"Supple ment 1 to N U R E G-0737 Require m ents for E m ergency Response C apability" requires that, as a minimum, the SP 0 S should provide information to plant operators about: i)-)iii)iv)v)Reactivity Control Reactor core cooling and heat removal from the primary system Reactor coolant syste m integrity Radioactivity control Containment Integrity Additional guidance used to select SP DS parameters was obtained from work performed by a utility owners group, Regulatory Guide 1.97, and operating experience.

The basis for the parameters selected to meet the requirements of each of the five areas identified in Generic Letter 82-33 is as follows: Reactivit Control The purpose of monitoring a reactivity controi para meter is to provide to the operator the status of flux conditions within the reactor core.In order.to assess the reactor core flux conditions it is necessary to monltot reactor power in all ranges and rate of change of power.Therefore, the SPDS monitors the startup range, wide range logarithmic and power range nuclear instruments.

This provides the means to monitor core.flux conditions throughout all ranges of reactor operation.

Changes in flux conditions are monitored'on the SPDS by the startup rate indication.

In addition to these parameters, reactor trip status is also displayed to provide the operator additional information on reactivity control syste ms status.The SPDS'monitors core power, startup rate, and reactor trip status.Based on the above evaluation, these parameters are sufficient to provide the operator with indication of reactivitiy control for a range of plant conditions.

SP DS Page 3 of 6 2.Reactor Core Coolin and Heat Removal from the Primar S stem The objective in this area is to provide sufficient indication such that an operator can determine, if the reactor core is being adequately cooled and heat is being continuously removed from this system.To ensure adequate core cooling and heat removal, it is necessary to ensure there is flow through the core and that a heat sink is available to remove heat from the core.There are three separate cases that must meet these criteria: RCS integrity maintained, loss of RCS integrity, and shutdown cooling.'I In the case where RCS integrity is maintained, flow through the core must first be established.

Core exit temperatures and cold leg temperatures are monitored on SPDS to assure that there is a differential temperature across the core and heat is being removed.Subcooling margin assures there is no void formation that might impede natural circulation through the core when there is no forced flow.The primary heat sink for this case would be the steam generators.

Steam generator levels and pressures provide indication that the steam generators are available as primary heat sinks.In the case where RCS integrity is not maintained (i.e., LOCA)the Safety Injection Actuation message on SPDS indicates that cooling water is going to the reactor coolant system.Core exit temperatures are monitored to assure that heat is being removed.The reactor vessel level monitor indicates the extent to which the core is covered with water.Finally, for the special case of shutdown cooling, a separate display provides indication of shutdown cooling flow and temperatures.

This, combined with core exit temperatures, is a positive indication of heat re m oval.These monitored para m e ters-core exit te m p era ture, cold leg te mperatures, subcooled margin, stea m generator level, stea m generator pressure, reactor vessel level, shutdown cooling temperatures and flow and the safety injection actuation message-are sufficient for the operator to assess reactor core cooling for a range of plant conditions.

30 RCS Inte rit The objective of this area is to provide sufficient indication such that an operator'can determine'if all primary coolant system boundaries are intact, thus maintaining coolant inventory for core cooling.RCS integrity may be breached either in the form of a Loss Of Coolant Accident (LO CA)to containment or as a Steam Generator Tube Rupture (SG T R).Pressurizer level, pressurizer pressure and reactor vessel level are used to provide the operator with indication of a properly maintained Reactor Coolant Syste m boundary.

SP DS Page 4 of 6 Additional indication of a failure of RCS integrity in the form of a LO CA can be determined by containment radiation or by the containment environment indication.

The containment environment indication will alarm if any of its input parameters

-containment te mperature, pressure or sump level-exceed set limits.Indication of a failure of RCS integrity in the form of a Steam Generator Tube Rupture (SGTR)is provided by steam generator levels and pressures and by the secondary radiation indication.

Rising steam generator level is one indication of an SGTR.The secondary radiation indication will alarm if either of its inputs, the steam generator blowdown radiation or air ejector radiation monitors, exceeds set limits.A SGTR could cause a secondary radiation alarm.Additionally, charging and letdown system flows are also displayed.

Increased charging flow is the first sign of a small breach in RCS integrity.

These monitored para meters-pressurizer pressure, pressurizer level, reactor vessel level, containment environment, containment radiation, secondary radiation, stea m generator levels, stea m generator pressures, and charging and letdown flows-are sufficient to assess R CS integrity for a range of operating conditions.

R adioac tiv it Control The objective of this area is to provide sufficient indication such that an operator can determine that no radioactive substances are being released to the environment in an uncontrolled manner.Radioactive products can be released from the RCS into either the containment during a LOCA or into the secondary side during a steam generator tube rupture.Radioactivity control is, therefore, monitored in two ways, by the containment radiation indication and by the secondary radiation indication.

Containment radiation is supplied as a digital indication from 1 to 108 R/hr.,A high radiation signal also causes a containment isolation signal to be initiated to prevent uncontrolled release to the environm ent.The secondary radiation indication will alarm if either of its monitored inputs-air ejector radiation or steam generator blowdown radiation-exceeds specified lim,its.These indications

-containment radiation and secondary radiation-provide the operator with indication of any potential uncontrolled

'radiation release.

SP DS Page 5 of 6 5 Containment Inte rit The objective of this area is to provide sufficient indication such that an operator can determine if a containment boundary is being maintained to control radioactive substances during and following a Loss of Coolant Accident (LOCA).To do this, challenges to the containment must be monitored.

Challenges to the containment are monitored via the containment environment indication.

The contaiment environment indication is a derived parameter using containment temperature, pressure, and sump level as inputs.Should any of these parameters go out of established limits, an alarm will occur.This provides an indication that containment integrity is being challenged, and corrective actions should be taken by the operator.The message for a-Safety Injection Actuation Signal (SIAS)on the display will infer that a Containment Isolation Signal (C IS)has been initiated (C IS occurs on SI AS).These indications

-containment environment and Safety Injection actuation-in conjunction with the RCS integrity parameters provide the essential information to assess containment integrity.

Based on the above information, the SP D S displays provide sufficient information for the control room operator to assess plant status during heatup-cooldown, normal operation, shutdown operation, and for a wide range of postulated plant accidents including Hain Steam Line Breaks (HSL6), LO CA's, SG TR's, and Boron Dilution Events.III.SAFETY ANALYSIS The Safety Parameter Display System is a nonwafety, non-seismic system (with the exception of the isolation system).It is a passive, monitoring and indication system only, and does not interact with the automatic initiation of any protection system.All modifications to safety-class IE circuits where SPDS inputs are obtained satisfy the isolation and'qualification requirements of FSAR Section 7.1 and 7.5.Only Safety Class IE equipment is used and separation is provided by routing wires through totally enclosed metallic wireways dedicated to each safety division and terminating in the Class IE Termination Cabinets.Furthermore, all interface between safety and non-safety signals are through:,.isolation devices fully, qualified and installed to IEEE-323-1974 and IEEE-344-1975 standards.

Finally, implementation of the SPDS will require no changes to the plant's Technical Spec if ications.Based on the above information, it has been determined that installation and operation of the SPDS does not constitute an unreviewed safety question in accordance with 10 C F R50.59.

SP DS Page 6 of 6 I V.I H PL E H E N T A TI 0 N In FPL letter L-83-236, dated April 15, 1983, FPL committed to have the Safety Parameter Display System (SPDS)fully operable, including training of operators, by the Fall 1984 outage at St.Lucie Unit 1.Due to the extended outage at St.Lucie 1 to remove the Thermal Shield, the next outage at Unit 1 is not planned until Fall 1985 (cycle 7).Because the SPDS installation can only be completed during a plant outage, final completion of the SPDS will be delayed until Fall 1985.Therefore, FPL will have the SPDS fully operable, including training of operators, prior to startup following the Fall 1985 outage at St.Lucie Unit 1.

ST.LUCIE PLANT UNIT NO.1 NUREG 0696-'UNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION KEY PARAMETERS TABLE 1 REMARKS Page 1 PLANT FUNCTION DESCRIPTION RANGE TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF METER ON DISPLAY TARGET, BAR GRAPH INSTRUHENTS USED CPS Source Range Power Level (Startup)10 1 to 104 CPS Direct Average Below Ti t le Digital Value 4 REACTIVITY CONTROL Percent Wide Range Power (Logrithmic)

Percent Power (Linear)Startup Rate Reactor Trip Signal 1x10 8 amps to 1504 0 to 1254-1 to 7 dpm Direct Average Direct Average Direct Average Ca l cu lated Below Title Below Title Message Area Line 6 Message Area Line 7 Digital Value 4 Digital Value 4 Digital Value 4"'Message Cold Leg Temperature 212o to 705oF Direct Average Top Row Right Bar Graph 6 Digital Value Wide Range WR)4 Narrow Range (NR Core Ex i t Tempera ture Feedwater Isolation Signal AFB 32 to 2300oF Direct Average This is a derived para-meter using AFAS ASB, HSIS ASB, and SIAS ASB Bottom Row Right Message Area Line 9 Digital Value Message 45 Thermocouples (TC's)6 Digital~Contact Inputs REACTOR CORE COOLING AND HEAT REMOVAL FROM THE PRIMARY SYSTEM Main Steam Isolation Signal (MSIS)ASB Direct Hessage Area Line 8 RCS Average Temperature A derived parameter Message Area from Hot 6 Cold Leg Temp.Line 5 Message 4 WR Co ld Leg 4 WR Hot Leg D i g i ta I Va lue 4 NR Co I d Leg 4 NR Hot Leg

ST.LUCIE PLANT UNIT NO.1'UREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION TABLE 1 Page 2 PLANT FUNCTION KEY PARAMETERS DESCRIPTION RANGE REMARKS TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF'HETER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED Reactor Vessel Level 0 to 1004 Lowest Bottom Row Center Target 1 for Channel A 1 for Channel B REACTOR CORE COOLING AND HEAT REMOVAL FROM THE PRIMARY SYSTEM Shutdown Cooling (SDC)Flow SDC from.RCS (Temp.)SDC to RCS (Temp.)Safety Injection Actuation Signal (SIAS)0 to 8000 gpm 0 to 400oF 0 to 400oF Direct Direct Direct Direct Center Section Center/Left Section Center/Left Section Message Area Line 10 Bar Graph S Dig i ta l Va lue Bar Graph 6 D i g i ta 1 Va 1ue Bar Graph 6 Digital Value Message 2 Digital Contacts Steam Generator (S/G)Leve Is A 6 B S/G Pressure A 6 B 0 to 1004 0 to 1200 Average Center Section Average Center Section Bar Graph 6 Digital Value Bar Graph 8 Digital Value 4 NR S/G A 4 NR S/G B 3S/G A 3 S/G B RCS INTEGRITY Subcooling Charging Fl'ow Containment Environment 700 to-2100oF Lowest (subcooled to superheat) 0 to 150 gpm Direct A der i ved par arne te r using containment pressure, temperature, level Bottom Row Right Middle Row/Left Bottom Row Target Bar Graph 6 Digital Value Target Cont.Level 2 Cont.Press.8 Cont.Temp.1 ST.LUG I E PLANT UNIT NO.1 NUREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION KEY PARAMETERS TABLE 1 REMARKS Page 3 PLANT FUNCTION DESCRIPTION RANGE TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUMBER OF METER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED Conta inment Radiation Core Exit Temperature Letdown Flow 10o to 108 R/HR 32 to 2300oF 0 to 140 gpm Average Direct Average Direct Bottom Row Bot tom Row Right Middle Row/Left Digital Value 2 Low Range'Wide Range Digital Value 45 TC's Bar Graph 6 Digital Value Pressurizer Level 0 to 1004 Average Top Row Center Bar Graph S Digital Value RCS INTEGRITY Pressurizer Pressure 0 to 1600 psia Direct Top Row Bar Graph 6 Digital Value RCS Average Temperature Derived from Hot 6 Cold Leg Temps.Message Area Line 5 Digital Value 4 WR Co I d Leg 4 WR Hot Leg 4 NR Cold Leg 4 NR Hot Leg RCS Pressure-0 to 3000 psia Calculated Top Row Bar Graph 6 Digital Value 4 Narrow Range 2 Wide Range Reactor Vessel Level 0 to 1004 Lowest Bottom Row Center Digital Value 1-Ch.A 1-Ch.B Secondary Radiatio~S/G Level AGB S/G Pressure Derived from S/G Blowdown 6 Air Ejector Radiation 0 to 1004 Average 0 to 1200 psia Average Bottom Row Left Cente'r Section Center Section Target Bar Graph S Digital Value Bar Graph 6 Digital Value 1-Air Ejector 2-S/G B lowdown 4 NR S/G A 4 NR S/G B 3 S/G A 3 S/G B ST.LUCIE PLANT UNIT NO-1 NUREG 0696-FUNCTIONAL CRITERIA FOR EMERGENCY RESPONSE FACILITIES SAFETY PARAMETER DISPLAY SYSTEM (SPDS)PARAMETER SELECTION TABLE 1 Page 4 PLANT FUNCTION-KEY PARAMETERS DESCRIPTION RANGE REHARKS TYPE LOCATION OF PARA-DISPLAY TYPE e.g.NUHBER OF HETER ON DISPLAY TARGET, BAR GRAPH INSTRUMENTS USED RAD IOACTI VTY Conta inment'Radiat ion CONTROL Secondary Radiation 100 to 108 R/HR Derived from S/G Blowdown 6 Air Ejector Radiation Average Bottom Row Ca lcu lated Bottom Row Digital Value Target 2 Low Range 2 Wide Range Air Ejector 1 S/G Blowdown CONTAINMENT INTEGRITY Containment Environment A derived parameter using containment temperature, pressure, 6 level Bottom Row Target Cont.Level 2 Cont.Press.8 Cont.Temp.1 vr