ML17251A838

Proposed Tech Specs Allowing Use of New Rod Position Indication Sys

ML17251A838
Person / Time
Site:	Ginna
Issue date:	10/24/1986
From:	ROCHESTER GAS & ELECTRIC CORP.
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ML17251A836	List: ML17251A835 ML17251A837 ML17251A838
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NUDOCS 8611030092
Download: ML17251A838 (36)

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AttachmentARevisetheTechnicalSpecificationpagesasfollows:Remove3.5-73.10-23.10-73.10-8-3.10-93.10-103.10-133.10-14-3.10-183.10-194.1-54.1-64.1-8Insert3.5-73.10-23.10-73.10-83.10-93.10-103.10-133.10-143.10-14a3.10-183.10-193.10-19a4.1-54.1-64.1-8SSSioSO0V~BS>0Z4PDRADOCK05000244'P.PDR TABLE3.5-1(Continued)Page2of36NO.FUNCTIONAIUNITll.TurbineTrip12.SteamFlowFeedwaterFlowMismatchWithLoSteamGeneratorLevelNO.OFCHANNELS3.-NO.OFCHANNELSTOTRIP22/loop*1/loopMIN.OPERABLECHANNELS1/loopMIN.DEGREEOFREDUNDANCY1/loopOPERATORACTIONPERMISSIBLEIFCONDITIONSOFBYPASSCOLUMN3OR5CONDITIONSCANNOTBEMETMaintain50/ofRatedPowerMaintainhotshutdown13.LoLoSteamGeneratorMaterLevel3/loop-.-2/loop2/loop1/loopMaintainhotshutdown14.VlI15.Undervoltage4KVBusUnderfrequency4KVBus2/bus2/bus1/bus1/bus1/bus1/bus(bothbusses)iCMaintainhotshutdownMaintainhotshutdown16.QuadrantPowerTiltMonitor(Upper8IowerEx-CoreNeutronDetectors)1orIogindividualupper8lowerionchambercurrentsonce/hr8afteraloadchangeof10/orafter48stepsofcontrolrodmotionMaintainhotshutdown 3.10.1.2Whenthereactoriscriticalexceptforphysicstestsandcontrolrodexercises,theshutdowncontrolrodsshallbefullywithdrawn(indicatedposition).3.10.1.3Whenthereactoriscritical,exceptforphysicstestsandcontrolrodexercises,eachgroupofcontrolrodsshallbeinsertednofurtherthanthelimitsshownbythelinesonFigure3.10-1andmovedsequentiallywitha100(+5)step(demandposition)overlapbetween3.10.1.4successivebanks.DuringcontrolrodexercisesindicatedinTable4.1-2,theinsertionlimitsneednotbeobservedbuttheFigure3.10-2mustbeobserved.3.10.1.5Thepartlengthcontrolrodswillnotbeinsertedexceptforphysicstestsorforaxialoffsetcalibrationperformedat75%powerorless.3.10.1.6Duringmeasurementofcontrolrodworthandshutdownmargin,theshutdownmarginrequirement,Specification3.10.1.1,neednotbeobservedprovidedthereactivityequivalenttoatleastthehighestestimatedcontrolrodworthisavailablefortripinsertionandallpartlengthcontrolrodsarefullywithdrawn.Eachfulllengthcontrolrodnotfullyinserted,thatis,therodsavailablefortripinsertion,shallbedemonstratedcapableoffull',insertionwhentrippedfromatleast"the50%withdrawnposition(indicated)within24hoursJl(priortoreducingtheshutdownmargintolessthanthelimitsofSpecification3.10.1.1.Thepositionofeachfulllengthrodnotfullyinserted,thatis,availablefortripinsertion,shallbedeterminedatleastonceper2hours.3.10-2Proposed 3.10.2.12Whenthereactoriscriticalandthermalpowerislessthanorequalto90%ofratedpower,analarmisprovidedtoindicatewhentheaxialfluxdifferencehasbeenoutsidethetargetbandformorethanonehour(cumulative)out,ofany24hourperiod.Inaddition,whenthermalpowerisgreaterthan90%ofratedpower,analarmisprovidedtoindicatewhentheaxialfluxdifferenceisoutsidethetargetband.Ifeitheralarmisoutofservice,thefluxdifferenceshallbeloggedhourlyforthefirst24hoursthealarmisoutofserviceandhalf-hourlythereafter.3.10.33.10.3.1ControlRodDroTimeWhilecritical,theindividualfulllength(shutdownandcontrol)roddroptimefromthefullywithdrawnposition(indicated)shallbelessthanorequalto1.8secondsfrombeginningofdecayofstationarygrippercoilvoltagetodashpotentrywith:a.Tavgreaterthanorequalto540'F,andavgb.Allreactorcoolantpumpsoperating.3.10.3.2Withthedroptimeofany'ulllengthroddeterminedtoexceedtheabovelimit,restoretheroddroptimetowithintheabovelimitpriortocriticality.3.10.43.10.4.1ControlRodGrouHeihtWhilecritical,andexceptforphysicstesting,allfulllength(shutdownandcontrol)rodsshallbeoperableandpositionedwithin+12steps(indicatedposition)oftheirgroupstepcounterdemandposition.3.10-7Proposed 1CN 3.10.4.2Withanyfulllengthrodinoperableduetobeingimmovableasaresultofexcessivefrictionormechanicalinterferenceorknowntobeuntripable,determinethattheshutdownmarginrequirementofSpecification3.10.1.1issatisfiedwithin1hourandbeinhotshutdownwithin6hours.3.10.4.3Withonefulllengthrodinoperableduetocausesotherthanaddressedby3.10.4.2,above,ormisalignedfromitsgroupstepcounterdemandpositionbymorethan+12steps(indicatedposition),operationmaycontinueprovidedthatwithinonehoureither:3.10.4.3.1Therodisrestoredtooperablestatuswithintheabovealignmentrequirements,or3.10.4.3.2TherodisdeclaredinoperableandtheshutdownmarginrequirementofSpecification3.10.1.1issatisfied.Operationsmaythencontinueprovidedeither:a.Theremainderoftherodsinthegroupwiththeinoperablerodarealignedtothesameindicatedb.positionastheinoperablerodwithinonehour,whilemaintainingthelimitofSpecification3.10.1.3;orThepowerlevelisreducedtolessthanorequalnto75%ofratedpowerwithinthenextonehour,andthehighneutronfluxtripsetpointisreducedtolessthanorequalto85$ratedpowerwithinthenext,fourhours(totalofsixhours)andthefollowingevaluationsareperformed:(i)TheshutdownmarginrequirementofSpecification3.10.1.1isdeterminedatleastonceper12hours.3.10-8Proposed (ii)ApowerdistributionmapisobtainedfromthemovableincoredetectorsandF~(Z)andF<Hareverifiedtobewithintheirlimitswithin72hours.(iii)AreevaluationofeachaccidentanalysisofTable3.10-1isperformedwithin5days;thisreevaluationshallconfirmthatthepreviouslyanalyzedresultsoftheseaccidentsremainvalidforthedurationofoperationundertheseconditions.c.Ifpowerhasbeenrestrictedinaccordancewith(b)above,thenfollowingcompletionoftheevaluationidentifiedin(b),thepowerlevelandhighneutronfluxtripsetpointmaybereadjustedbasedontheresultsoftheevaluationprovidedtheshutdownmarginrequirementofSpecification3.10.1.1isdeterminedatleastonceper12hours.3.10.4.4Withtwoormorefulllengthrodsinoperableormisalignedfromthegroupstepcounterdemandpositionbymorethani12steps(indicatedposition),beinhotshutdown3.10.5within6hours.ControlRodPositionIndicationSstems3.10.5.1Whilecritical,therodpositionindicationsystemandthestepcountersshallbeoperableandcapableofdeterminingthecontrolrodpositionswithini12steps.3.10-9Proposed

'PVIIII

~~~~3.10.5.2Withamaximumofonerodpositionindicationperbankinoperableeither:a.Determinethepositionof,thenon-indicatingIJrod(s)'indirectlybythemovableincoredetectorsatleastonceper8hoursand,immediatelyafteranymotionofthenon-indicatingrodwhichexceeds24steps(demandposition)inonedirectionsincethelastdeterminationoftherod'sposition,orb.Reducethepowertolessthan50%ofratedpowerwithin8hours.3.10.5.3Withamaximumofonestepcounterperbankinoperableeither:a.Verifythatpositionindicationfore'achrodoftheaffectedbankisoperableandthattherodsofthebankareatthesameindicatedpositionatleastonceper8hours,orb.Reducethepowertolessthan50%ofratedpowerwithin8hours.BasisThereactivitycontrolconceptisthatreactivitychangesaccompanyingchangesinreactorpowerarecompensatedbycontrolrodmotion.Reactivitychangesassociatedwithxenon,samarium,fueldepletion,andlargechangesinreactorcoolanttemperature(operatingtemperaturetocoldshutdown)arecompensatedbychangesinthesolubleboronconcentration.Duringpoweroperation,theshutdowngroupsarefullywithdrawn3.10-10Proposed i,III conditionsareasfollows:1.Controlrodsinasinglebankmovetogetherwithnoindividualrodinsertiondifferingbymorethan25stepsfromthebankdemandposition.2.ControlrodbanksaresequencedwithoverlappingbanksasdescribedinSpecification3.10.3.Thefulllengthcontrolbankinsertionlimitsarenotviolated.4.Axialpowerdistributionlimitswhicharegivenintermsoffluxdifferencelimitsandcontrolbankinsertionlimitsareobserved.Fluxdifference,isjtqT-qBasdefinedinSpecification2.3.1.2d.'ThepermittedrelaxationinF<Hwithreducedpowerallowsradialpowershapechangeswithrodinsertiontotheinsertionlimits.Ithasbeendeterminedthatprovidedtheaboveconditions1through4areobserved,thesehotchannelfactorslimitsaremet.InSpecification3.10,FisarbitrarilylimitedforP(0.5(exceptforlowerpowerphysicstests).Thelimitsonaxialpowerdistributionreferredtoabovearedesignedtominimizetheeffectsofxenonredistributionontheaxialpowerdistributionduringload-followmaneuvers.Basically,controloffluxdifferenceisrequiredtolimitthedifferencebetweenthecurrentvalueofFluxDifference(LI)andareferencevaluewhichcorrespondstothefullpowerequilibrium3.10-13Proposed valueofAxialOffset(AxialOffset=b,I/fractionalpower).Thereferencevalueoffluxdifferencevarieswithpowerlevelandburnupbutexpressedasaxialoffsetitvariesprimarilywithburnup.ThetechnicalspecificationsonpowerdistributionassurethattheF~upperboundenvelopeof2.32timesFigure3.10-3isnotexceededandxenondistributionsarenotdevelopedwhich,atalatertime,couldcausegreaterlocalpowerpeakingeventhoughthefluxdifferenceisthenwithinthelimits.Thetarget(orreference)valueoffluxdifferenceisdeterminedasfollows.At,anytimethatequilibriumxenonconditionshavebeenestablished,theindicatedfluxdifferenceisnotedwithpartlengthrodswithdrawnfromthecoreandwithcontrolBankDmorethan190steps(indicatedposition)withdrawn.Thisvalue,dividedbythefractionoffullpoweratwhichthecorewasoperatingisthefullpowervalueofthetargetfluxdifference.Valuesforallothercorepowerlevelsareobtainedbymultiplyingthefullpowervaluebythefractionalpower.Sincetheindicatedequilibriumvaluewasnoted,noallowancesforexcoredetectorerrorarenecessaryandindicateddeviationof25percentBIispermittedfromtheindicatedreferencevalue.Duringperiodswhereextensiveloadfollowingis3.10-14Proposed required,itmaybeimpossibletoestablishtherequiredcoreconditionsformeasuringthetargetfluxdifferenceeverymonth.Forthisreason,twomethodsare3.10-14aProposed feetoutofalignmentwithitsbank)doesnotresultinexceedingcoresafetylimitsinsteadystateoperationatratedpowerandisshortwithrespecttoprobabilityofanindependentaccident.Ifinsteadofdeterminingthehotchannelfactors,theoperatordecidestoreducepower,thespecified75%powermaintainsthedesignmargintocoresafetylimitsforupto1.12powertilt,usingthe2to1ratio.Reducingtheoverpowertripset,pointensuresthattheprotectionsystembasisismaintainedforsustainedplantoperation.Atiltratioof1.12ormoreisindicativeofaseriousperformanceanomalyandaplantshutdownisprudent.Themaximumroddroptimerestrictionisconsistentwiththeassumedroddroptimeusedinthesafetyanalyses.MeasurementwithTgreaterthanoravgequalto540'Fandwithbothreactorcoolantpumpsoperatingensuresthat.themeasureddroptimeswillberepresentativeofinsertiontimesexperiencedduringareactortripatoperatingconditions.IIThevariouscontrolrodbanks(shutdownbanks,controlbanksA,B,C,andD)areeachtobemovedlasabank;thatis,withallrodsinthebankU'ithinonestep(5/8inch)ofthebankposition.Positionindicationisprovidedbytwomethods:adigitalcountofactuationpulseswhichshowsthe3.10-18Proposed

~~demandpositionofthebanksandamicroprocessorrodpositionindication(MRPI)systemwhichindicatestheactualrodposition.Thedigitalcountersareknownasthestepcounters.Operabilityofthecontrolrodpositionindicationisrequiredtodeterminecontrolrodpositionsandtherebyensurecompliancewiththecontrolrodalignmentandinsertionlimits.The12steppermissibledemandtoindicatedmisalignmentandthe,0steprodtorodindicatedmisalignmentensuresthatthe25stepmisalignmentassumedinthesafetyanalysis"ismet.TheMRPIsystemdisplaysthepositionofallrodsonaCRT.AfailureoftheCRTwouldresultinlossofpositionindicationoftherodseventhoughtheMRPIsystemisstilloperable.SincetheMRPIsystemalsotransmitsrodpositioninformationtothePlantProcessComputerSyst:em(PPCS),thePPCScanbeusedforrodpositionindicationuntiltheCRTismadeoperable.Theactionstatementswhichpermitlimitedvaria-tionsfromthebasicrequirementsareaccompaniedbyadditionalrestrictionswhichensurethattheoriginaldesigncriteriaaremet.Misalignmentofarodrequiresmeasurementofpeakingfactorsora3.10-19Proposed 01\Jk1 restrictioninpower;eitheroftheserestrictionsprovideassuranceoffuelrodintegrityduringcontinuedoperation.Znaddition,thosesafetyanalysesaffectedbyamisalignedrodarereevaluatedtoconfirmthattheresultsremainvalidduringfutureoperation.

References:

(1)UpdatedFinalSafetyAnalysisReport(UFSAR)Section4.2.3.10-19aProposed TABLE4.1-1MINIMUMFREQUENCIESFORCHECKSgCALIBRATIONSANDTESTOFINSTRUMENTCHANNELSChannelDescrition1.NuclearPowerRangeCheckSM*(3)CalibrateD(1)Q*(3)TestB/W(2)(4)P(2)(5)Remarks1)Heatbalancecalculation**2)SignaltoAT;bistableaction(permissive>rodstop>trips)~3)Upperandlowerchambersforaxialoffset**4)Highsetpoint(<109%ofratedpor)5)Lowsetpoint('<25%ofratedpower)2.NuclearIntermediateS(l)RangeN.A.P(2)1)Once/shiftwheninservice2)Loglevel;bistableaction(permissive>rodstop>trip)3.NuclearSourceRangeS(l)N.A.P(2)1)Once/shiftwheninservice2)Bistableaction(alarm<trip)4.ReactorCoolantTemperature5.ReactorCoolantFlowSM(l)(2)1)Overtemperature-DeltaT2)Overpower-DeltaT6.PressurizerWaterLevel7.PressurizerPressureS,08.4KvVoltageFrequency0e9.RodPositionfhIndicationN.A.S(1,2)N.A.ReactorProtectioncircuitsonly1)Withstepcounters2)Logrodpositionindicationseach4hourswhenroddeviationmonitorisoutofservice*Bymeansofthemovablein-coredetectorsystem.**Notrequiredduringhot>cold>orrefuelingshutdownbutassoonaspossibleafterreturntopower.

lLg,r>I'1Il-ylIIL4GliW TABLE4.1-1(Continued)Channel10.RodPositionBankCountersCheckCalibrateN.ATestN.A.Remarks1)Withrodpositionindication2)Logrodpositionindicationseach4hourswhenroddeviationmonitorisoutofservicell.SteamGeneratorLevelS12.ChargingFlow13.ResidualHeatRemovalPumpFlowN.A.N.A.N.A.N.A.14.BoricAcidTankLevelDNABubblertuberoddedweekly15.RefuelingWaterStorageTankLevel16.VolumeControlTankLevelN.A.N.A.N.A.N.A.17.ReactorContainmentPressureDM(l)1)IsolationValvesignal18.RadiationMonitoringSystem19.BoricAcidControlDN.AN.A.AreaMonitorsRltoR9ISystemMonitorR1720.ContainmentDrainSumpLevelN.A.N.A21.ValveTemperature4Interlocks0Q922.Pump-ValveInterlock23.TurbineTripSet-PointN.A.N.A.N.A.N.A.N.A.M(l)1)BlockTrip24.AccumulatorLevelandPressureN.A.

TABLE4.1-2MINIMUMFREQUENCIESFOREQUIPMENTANDSAMPLINGTESTS1.ReactorCoolantChemistrySamplesTestChlorideandFluorideOxygenFrequency3times/weekandatleasteverythirdday5times/weekandatleasteveryseconddayexceptwhenbelow250FFSARSectionReference2.ReactorCoolantBoronBoronconcentrationWeekly3.RefuelingWaterStorageTankWaterSampleBoronconcentrationWeekly4.BoricAcidTank5.ControlRods6.FullLengthControlRodBoronconcentrationRoddroptimesofallfulllengthrodsMoveanyrodnotfullyinsertedasufficientnumberofstepsinanyonedirectiontocauseachangeofpositionasindicatedbytherodpositionindicationsystemTwice/weekAftervesselheadremovalandatleastonceper18months(1)t1onthly77.PressurizerSafetyValvesSetpointEachRefuelingShutdown8.MainSteamSafetyValvesSetpointEachRefuelingShutdown109.Containment.IsolationTripFunctioningEachRefuelingShutdown10.RefuelingSystemInterlocksFunctioningPriortoRefuelingOperations9.4.5ll.ServiceWaterSystem12.FireProtectionPumpandPowerSupplyFunctioningFunctioningEachRefuelingShutdownMonthly9.5.59.5.54.1-8Proposed AttachmentBDuringtheSpring1987outagetheanalogrodpositionindication(ARPI)systemwillbereplacedwithaWestinghousemicroprocessorrodpositionindication(MRPI)system.TheARPIsystemisbeingreplacedbecausethesystemrequiressignificanteffortto'aintainalignments,theagingsystemisbecomingpronetocomponentfailures,andsparepartsaredifficulttoobtain.Also,replacingtheARPIsystemwillresolvehumanengineeringdiscrepenciesraisedduringthedetailedcontrolroomdesignreview.AblockdiagramoftheMRPIsystemisillustratedonFigure1.Thesystemconsistsofadigitaldetectorassemblyforeachrod,adatacabinetlocatedinsidecontainment,anddisplayrackslocatedintherelayroom.RodpositiondataisdisplayedonacolorCRTinthecontrolroomandalsotransmittedtotheplantprocesscomputersystem(PPCS).Thedatacabinetinsidecontainmentcontainstwomultiplexerswhichtakerodpositioninformationfromeachoftherodsandtransmitittotheprocessorswhichareinthedisplayrackslocatedintherelayroom.OneprocessorsuppliesinformationtotheCRTlocatedonthecontrolboard,theotherprocessorsuppliesinformationtothePPCS.Bothprocessorsarerequiredtoproduceaturbinerunbackandblockrodwithdrawalsignal.TheMRPIsystemsensesrodpositioninintervalsof12stepsforeachrod.Thedigitaldetectorassembliesconsistof20discretecoilpairsspacedat12stepintervalsasillustratedonFigure2.TheMRPIsystemwillnormallyindicate0rodpositionuntiltherodgoesfromthefifthtosixthstep.Atthattimetheindicationwillnormallyswitchfrom0to12.Whentherodgoesfromtheseventeenthtoeighteenth,theindicationwillnormallyswitchfrom12to24.Therodwillnormallybewithin+6stepsoftheMRPIindication,however,ifthetransitionuncertaintyof+2stepsisconsideredtherodwillalwaysbewithin+8stepsoftheMRPIindication.ThechangesmadetotheTechnicalSpecificationsbasicallyreplacereferencestotheARPIsystemwithreferencestotheMRPIsystem,provideclarificationwhetherindicatedpositionordemandpositionsisrequired,allowthePPCStobeusedasabackuptotheMRPICRTiftheCRTshouldbecomeinoperable,removethecalibrationrequirement,andmodifytherodmovementtest.ThedetailedchangesaredescribedonTableI.ThePPCSbackupisusedbecauseintheMRPIsystemiftheCRTbecomesinoperable,positionindicationislostforallrods,whereas,intheoldARPIsystemthereisoneindicatorforeachrod;anindicatorfailurewouldresult.inlossofpositionindicationforonlyonerod.ThesafetyconcernsassociatedwithreplacingtheARPIsystemwiththeMRPIsystemareassociatedwithgenerationofaturbinerunback(TR)signal,generationofablockrodwithdrawal(BRW)signal,andtheabilitytocomplywiththerodmisalignmentrequirement.

ThecurrentARPIsystemconsistsofonedetectorassemblyperrod.ThedetectorassemblyisinputtoanARPIdrawer(onedrawerprocessestworods).TheARPIsystemdrawerswillsensearodbottomforanyrodandsendanactuatingsignaltotheTRandBRWrelays.Thesignalfromonedrawerisrequiredto:generateaTRandBRW.TheMRPIsystemconsistsofonedigitaldetectorassemblyperrod.AllthedetectorassembliesaremultiplexedandbecomeinputtotworedundantMRPIsignalprocessors.Eachsignalprocessorindependentlymonitorsallrodsandsensesarodbottomforanyrod.ArodbottomsignalfrombothsignalprocessorsisrequiredtogenerateaTRandBRW.ThetwooutoftwocoincidentreducesinadvertentTRandBRWbutdoesnoteffecttheaccidentanalysisassumptions.TheroddropanalysisassumesaTRisgeneratedbyrodbottomindicationfromtheRPIsystemornegativefluxrate,whicheverismorelimiting.FailureofacomponentmaypreventaTRfromtheRPIsystembutnotfromthenegativefluxratecircuitry.However,failureofaprocessororothercomponentsintheMRPIsystemwillbeannunciatedonthemaincontrolboard.ThisconditionisthesameastheexistingARPIsystem;failureofthedrawerrespondingtoadroppedrodwillalsonotproduceaTRfromthepositionindicationsystem.However,theredundantnegativefluxrateTRwillstillbeavailableinaccordancewiththesafetyanalysis.TheNRPIsystemisdesignedtosatisfytherodmisalignmentrequirement.TheMRPIsystemdeterminesrodpositionin12stepintervals.Thetruerodpositionisalwayswithin28stepsoftheindicatedposition(k6stepsduetothe12stepintervalandi2stepstransitionuncertaintyduetoprocessingandcoilsensitivity).'igure2illustratesascenariowherearodbecomesstuckatthefourthstep.TheNRPIforthatrodcouldbe12.Sincethestepcounterdoesnot.knowtherodisstuckitwouldcontinuetocount.TheroddeviationalarmwillbegeneratedbythePPCSasiscurrentlydonefortheARPIsystem.Thealarmwouldbegeneratedwhenthestepcounterreaches24steps(24steps-MRPIindicationof12steps=isetpointof12steps).Therefore,themaximumdeviationpossibleis24-4or20steps.Thisisboundedbytheaccidentanalysiswhichassumes25steprodmisalignment.Anotherpossiblesituationistherodtorodmisalignmentwithinagrouporabank.ThissituationisassociatedwithSpecifications3.10.4.3.2aand3.10.5.3a.UsingFigure2asanaid,assumetheinoperablerodisatstep4.TheMRPIindicationforthisrodcouldbe12steps.IftheotherrodswithinthegrouporbankarealignedsothattheirMRPIindicatedpositionisalso12steps,thehighestactualpositionforanyoftheserodswouldbe19steps.Therefore,iftherodsarerequiredtohavethesameindicatedpositionthemaximumactualpositiondifferencewouldbe19-4or15steps.Thisisboundedbytheaccidentanalysiswhichassumes25stepsrodmisalignment.Thus,replacingtheARPIsystemwiththeMRPIsystemisacceptableprovidedSpecifications3.10.4.3.2aand3.10.5.3aarechangedtorequiretheaffectedrodstobealignedtothesameindicatedposition.

ThefinalsafetyissueconcernsresponsetimefortheTR.TheMRPIsystemprocessesrodpositioninformationseveraltimesasecond.Westinghousehascalculatedtheresponsetimetobeapproximatelyonesecond.ThisislessthanthecalculatedresponsetimeoftheARPIsystem.SincetheMRPIresponsetimeisfasterthantheARPIresponsetime,replacingtheARPIsystemwiththeMRPIsystemdoesnotchangetheresultsofthecurrentsafetyanalysis.CalibrationisdefinedinthecurrentTechnicalSpecification1.7.1as"Theadjustment,asnecessary,ofthechanneloutputsothatitrespondswiththenecessaryrangeandaccuracytoknownvaluesoftheparameterwhichthechannelmonitors".Thisdefinitionisinappropriateforadigitalsystem.OncetheMRPIsystemisinstalledandthedigitaldetectorassembliespositionedthesystemdoesnotneedperiodiccalibration.SincedriftisnotaproblemwithdigitalequipmenttherequirementforperiodiccalibrationabovehasbeenremovedfromTable4.1-1.TheexistingrequirementsforcheckingandtestingwillinsureproperfunctioningoftheNRPIsystem.Therodmovementtest(item6Table4.1-2)requiredmodificationbecauserodmovementcouldbecheckedbytheNRPIsystemwithrodmovementassmallasonesteporaslargeastwelvesteps(SeeFigure2).Sincerodmovementmaybecheckedwithlessthanatensteprodmotionorasmuchastwelvestep,rodmotionthecurrentrequirementisnolongerappropriate.Inaccordancewith10CFR50.91,thischangetotheTechnicalSpecificationshasbeenevalutedagainstthreecriteriatodetermineiftheoperationofthefacilityinaccordancewiththeproposedamendmentwould:l.Involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated;or2.Createthepossibilityofanewordifferentkindofaccidentfromanyaccident,previouslyevaluated;or3.Involveasignificantreductioninmarginofsafety.Theproposedchangesdonot,involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluatedbecausetheMRPIsystemwillindicaterodmisalignmentwithintheboundsofcurrentsafetyanalyses,theMRPIsystemresponsetimeisfasterthantheAPRIsystem,andtheresponsetoacontrolroddropcoincidentwithasystemsinglefailureisessentiallythesameasthatoftheARPIsystem.TheproposedchangesdonotcreatethepossibilityofanewordifferentkindofaccidentfromanypreviouslyevaluatedbecausetheMRPIsystemprovidesthesameinterfacesastheexistingARPIsystem.Thenewprocessingisdigitalversusanalog.FailureofNRPIonlycauseslossofindicationwhichisconsistent,withafailureoftheAPRIsystem.

TheproposedchangesdonotinvolveasignificantreductioninmarginofsafetybecausetheexistingboundsusedinthesafetyanalysisfortheARPIsystemareapplicabletotheMRPIsystem.'herefore,anosignificanthazardsfindingiswarrantedfortheproposedchanges.

~~'FIGURE,MRPI',;SUBSYSTEMARCHITECTUREDETEC.TORS..B.,DATACABINETMANUALSELECTORSWITCHESINSIDECONTAINMENTOUTSIDECONTAINMENT8RGBALPHAVIDEOVIDEOSUPPORT'CA,RD2/2D/ACONVERTERSURGESUPPRES-SIONDISPLAYRACKS(RELAYROOM)CRTCONTROLROOMMCBTURBINERUNBACKMCBCOMPUTERMUXRELAYROOM I

NoraelOperationFIGURE2XLLUSTRATONOFHRPIINDICATIONStuckRodactualrodposition4342414039383736353433323130292827262524232221201918171615141312ll109876543210stepcounter434241~4393837363534333231302927262524232221201918171615141312ll1087543210HRPIdisplay362412actualrodposition4(stuck)3210stepcounter434241Q039383736353433323130292Q272625242322212019'1171615141312ll1098543210NRPIdisplay121212dottedlineindicatestransitionuncertaintyassociatedwithprocessingandcoilsensitivities

~~Table1DetailedTechnicalSpecificationChangesLocationDescritionofCheReasonforChepg.3.5-7item16changed30"to48stepswiththeMRPIsystemallindicationsareinstepvsinches,48stepsisecpivalentto30inches.pg.3.10-2section3.10.1.2pg.3.10-2section3.10.1.3pg.3.10-2section3.10.1.6pg.3.10-7section3.10.3.1pg.3.10-8section3.10.4.3.2added"(zndzcated)"added"(indicated)"removed"within&+2stepsof"added"thesameindicatedpositionas"operatorclarificationcperatorclarificationmaintainuncertaintywithinthesafetyanalysisassumptionof25stepsadded"(indicatedposition)"operatorclarificationadded"(demandposition)"operatorclarificationpg.3.10-9section3.10.5.1pg.3.10-10section3.10.5.2removetheword"analog"added"(demandposition)"Plremovetheword"analog"added"(demandposition)"removereferencetoARPIsystemoperatorclarificationreravereferencetoARPIsystemoperatorclarification'g.3.10-10section'.10.5.3allowsindicationtobebytheMRPIsystenorPPCSmaintainuncertaintywithinthesafetyanalysisassumptionof25stepsreplaced,"indicator"with"indication""removed"mostwitMrawnrodandleastwithdrawnrcdofthebankarewithinamaximumof12stepsofeachother'"added"rodsofthebankareatthesaneindicatedposition"pg.3.10-13topofpagechanged24to25safetyanalysisassumes25stepspg.3.10-14middleofpagepg.3.10-14apg.3.10-18pageaddedpartofpage3.10-18isnewonpage3.10-19retypingrecpiredadditionalpageadded"(indicatedposition)"operatorclarification 0~~rh LocationDescritionofReasonforChanepg.3.10-19todoretyping,partofpage3.10-18isnowonpage3.10-19linearpositionindicatorreplaceARPIwithbSPI(LVDT)replacedwithmicro-processorrodpositionindication(MRPI)systemreference2wasrenovedFSAR,Section7.3doesnotdescribethenewMRPIsystemreworded"Theseareknownasthestepcountersandanalogredpositionindicationrespectively",to,"Thedigitalccuntersareknownasthestepcounters".redundentchangedindicatorstoindicationallowindicationtobebytheMRPIsystemorPPCSremoved"(7.5inches)"replaced"15inches"with"25steps"withtheMRPIsystemallindicationsareinstepsvs.inchesaddedadiscussiononusesofthePECSasbackuptoCRTallerPECSasbackuptoCRTpg.3.10-19apg.4.1-5item4updatedreference1removedreference2addednote(2)updatedreferencetoUFSARFSAR,Section7.3doesnotdescribethenewnmIsystemthisnotewasinadvertentlyanittedwhenthispagewasre~forAdmend-ment21pg.4.1-5item9changed"AnalogRodPosition"to"RodPositionIndication"allowindicationtobebytheMRPIsystemorPPCSrenovethecalibrationrecpirenentsdigitalsystemsarenotsubjecttoinstrumntdriftchange"analogrcdpositions"to"rodpositionsindications"allerindicationtobebytheMRPIsystemorPPCS LocationDescritionofReasonforChanepg.4.1-6item10changed"analogredallcwindicationtobebyposition"to"rodpositiontheMRPIsystemorPECSindication"pg.4.1-8item6changed"analogrodpos3.'t3.ons"to"rodpositionindications"changedTestto"Moveanyrodnotfullyinsertedasufficientnumberofstepsinanyonedirectiontocauseachangeofpositionasindicatedbytherodpositionindicationsystemaminimimmovementof10stepsisinappropriateforthenewsystem.Arodmovementof1to12stepswillcauseanindicationchangeontheMRPIsystem.

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