ML17251A838

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Proposed Tech Specs Allowing Use of New Rod Position Indication Sys
ML17251A838
Person / Time
Site: Ginna Constellation icon.png
Issue date: 10/24/1986
From:
ROCHESTER GAS & ELECTRIC CORP.
To:
Shared Package
ML17251A836 List:
References
NUDOCS 8611030092
Download: ML17251A838 (36)
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Attachment ARevisetheTechnical Specification pagesasfollows: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.FUNCTIONAI UNITll.TurbineTrip12.SteamFlowFeedwater FlowMismatchWithLoSteamGenerator LevelNO.OFCHANNELS3.-NO.OFCHANNELSTOTRIP22/loop*1/loopMIN.OPERABLECHANNELS1/loopMIN.DEGREEOFREDUNDANCY 1/loopOPERATORACTIONPERMISSIBLE IFCONDITIONS OFBYPASSCOLUMN3OR5CONDITIONS CANNOTBEMETMaintain50/ofRatedPowerMaintainhotshutdown13.LoLoSteamGenerator MaterLevel3/loop-.-2/loop2/loop1/loopMaintainhotshutdown14.VlI15.Undervoltage 4KVBusUnderfrequency 4KVBus2/bus2/bus1/bus1/bus1/bus1/bus(bothbusses)iCMaintainhotshutdownMaintainhotshutdown16.QuadrantPowerTiltMonitor(Upper8IowerEx-CoreNeutronDetectors) 1orIogindividual upper8lowerionchambercurrentsonce/hr8afteraloadchangeof10/orafter48stepsofcontrolrodmotionMaintainhotshutdown 3.10.1.2Whenthereactoriscriticalexceptforphysicstestsandcontrolrodexercises, theshutdowncontrolrodsshallbefullywithdrawn (indicated position).

3.10.1.3Whenthereactoriscritical, exceptforphysicstestsandcontrolrodexercises, eachgroupofcontrolrodsshallbeinsertednofurtherthanthelimitsshownbythelinesonFigure3.10-1andmovedsequentially witha100(+5)step(demandposition) overlapbetween3.10.1.4successive banks.Duringcontrolrodexercises indicated inTable4.1-2,theinsertion limitsneednotbeobservedbuttheFigure3.10-2mustbeobserved.

3.10.1.5Thepartlengthcontrolrodswillnotbeinsertedexceptforphysicstestsorforaxialoffsetcalibration performed at75%powerorless.3.10.1.6Duringmeasurement ofcontrolrodworthandshutdownmargin,theshutdownmarginrequirement, Specification 3.10.1.1, neednotbeobservedprovidedthereactivity equivalent toatleastthehighestestimated controlrodworthisavailable fortripinsertion andallpartlengthcontrolrodsarefullywithdrawn.

Eachfulllengthcontrolrodnotfullyinserted, thatis,therodsavailable fortripinsertion, shallbedemonstrated capableoffull',insertion whentrippedfromatleast"the50%withdrawn position(indicated) within24hoursJl(priortoreducingtheshutdownmargintolessthanthelimitsofSpecification 3.10.1.1.

Thepositionofeachfulllengthrodnotfullyinserted, thatis,available fortripinsertion, shallbedetermined atleastonceper2hours.3.10-2Proposed 3.10.2.12Whenthereactoriscriticalandthermalpowerislessthanorequalto90%ofratedpower,analarmisprovidedtoindicatewhentheaxialfluxdifference hasbeenoutsidethetargetbandformorethanonehour(cumulative) out,ofany24hourperiod.Inaddition, whenthermalpowerisgreaterthan90%ofratedpower,analarmisprovidedtoindicatewhentheaxialfluxdifference isoutsidethetargetband.Ifeitheralarmisoutofservice,thefluxdifference shallbeloggedhourlyforthefirst24hoursthealarmisoutofserviceandhalf-hourly thereafter.

3.10.33.10.3.1ControlRodDroTimeWhilecritical, theindividual fulllength(shutdown andcontrol)roddroptimefromthefullywithdrawn position(indicated) shallbelessthanorequalto1.8secondsfrombeginning ofdecayofstationary grippercoilvoltagetodashpotentrywith:a.Tavgreaterthanorequalto540'F,andavgb.Allreactorcoolantpumpsoperating.

3.10.3.2Withthedroptimeofany'ulllengthroddetermined toexceedtheabovelimit,restoretheroddroptimetowithintheabovelimitpriortocriticality.

3.10.43.10.4.1ControlRodGrouHeihtWhilecritical, andexceptforphysicstesting,allfulllength(shutdown andcontrol)rodsshallbeoperableandpositioned within+12steps(indicated position) oftheirgroupstepcounterdemandposition.

3.10-7Proposed 1CN 3.10.4.2Withanyfulllengthrodinoperable duetobeingimmovable asaresultofexcessive frictionormechanical interference orknowntobeuntripable, determine thattheshutdownmarginrequirement ofSpecification 3.10.1.1issatisfied within1hourandbeinhotshutdownwithin6hours.3.10.4.3Withonefulllengthrodinoperable duetocausesotherthanaddressed by3.10.4.2, above,ormisaligned fromitsgroupstepcounterdemandpositionbymorethan+12steps(indicated position),

operation maycontinueprovidedthatwithinonehoureither:3.10.4.3.1 Therodisrestoredtooperablestatuswithintheabovealignment requirements, or3.10.4.3.2 Therodisdeclaredinoperable andtheshutdownmarginrequirement ofSpecification 3.10.1.1issatisfied.

Operations maythencontinueprovidedeither:a.Theremainder oftherodsinthegroupwiththeinoperable rodarealignedtothesameindicated b.positionastheinoperable rodwithinonehour,whilemaintaining thelimitofSpecification 3.10.1.3; orThepowerlevelisreducedtolessthanorequalnto75%ofratedpowerwithinthenextonehour,andthehighneutronfluxtripsetpointisreducedtolessthanorequalto85$ratedpowerwithinthenext,fourhours(totalofsixhours)andthefollowing evaluations areperformed:

(i)Theshutdownmarginrequirement ofSpecification 3.10.1.1isdetermined atleastonceper12hours.3.10-8Proposed (ii)Apowerdistribution mapisobtainedfromthemovableincoredetectors andF~(Z)andF<Hareverifiedtobewithintheirlimitswithin72hours.(iii)Areevaluation ofeachaccidentanalysisofTable3.10-1isperformed within5days;thisreevaluation shallconfirmthatthepreviously analyzedresultsoftheseaccidents remainvalidforthedurationofoperation undertheseconditions.

c.Ifpowerhasbeenrestricted inaccordance with(b)above,thenfollowing completion oftheevaluation identified in(b),thepowerlevelandhighneutronfluxtripsetpointmaybereadjusted basedontheresultsoftheevaluation providedtheshutdownmarginrequirement ofSpecification 3.10.1.1isdetermined atleastonceper12hours.3.10.4.4Withtwoormorefulllengthrodsinoperable ormisaligned fromthegroupstepcounterdemandpositionbymorethani12steps(indicated position),

beinhotshutdown3.10.5within6hours.ControlRodPositionIndication Sstems3.10.5.1Whilecritical, therodpositionindication systemandthestepcountersshallbeoperableandcapableofdetermining thecontrolrodpositions withini12steps.3.10-9Proposed

'PVIIII

~~~~3.10.5.2Withamaximumofonerodpositionindication perbankinoperable either:a.Determine thepositionof,thenon-indicating IJrod(s)'indirectly bythemovableincoredetectors atleastonceper8hoursand,immediately afteranymotionofthenon-indicating rodwhichexceeds24steps(demandposition) inonedirection sincethelastdetermination oftherod'sposition, orb.Reducethepowertolessthan50%ofratedpowerwithin8hours.3.10.5.3Withamaximumofonestepcounterperbankinoperable either:a.Verifythatpositionindication fore'achrodoftheaffectedbankisoperableandthattherodsofthebankareatthesameindicated positionatleastonceper8hours,orb.Reducethepowertolessthan50%ofratedpowerwithin8hours.BasisThereactivity controlconceptisthatreactivity changesaccompanying changesinreactorpowerarecompensated bycontrolrodmotion.Reactivity changesassociated withxenon,samarium, fueldepletion, andlargechangesinreactorcoolanttemperature (operating temperature tocoldshutdown) arecompensated bychangesinthesolubleboronconcentration.

Duringpoweroperation, theshutdowngroupsarefullywithdrawn 3.10-10Proposed i,III conditions areasfollows:1.Controlrodsinasinglebankmovetogetherwithnoindividual rodinsertion differing bymorethan25stepsfromthebankdemandposition.

2.Controlrodbanksaresequenced withoverlapping banksasdescribed inSpecification 3.10.3.Thefulllengthcontrolbankinsertion limitsarenotviolated.

4.Axialpowerdistribution limitswhicharegivenintermsoffluxdifference limitsandcontrolbankinsertion limitsareobserved.

Fluxdifference, isjtqT-qBasdefinedinSpecification 2.3.1.2d.

'Thepermitted relaxation inF<Hwithreducedpowerallowsradialpowershapechangeswithrodinsertion totheinsertion limits.Ithasbeendetermined thatprovidedtheaboveconditions 1through4areobserved, thesehotchannelfactorslimitsaremet.InSpecification 3.10,Fisarbitrarily limitedforP(0.5(exceptforlowerpowerphysicstests).Thelimitsonaxialpowerdistribution referredtoabovearedesignedtominimizetheeffectsofxenonredistribution ontheaxialpowerdistribution duringload-follow maneuvers.

Basically, controloffluxdifference isrequiredtolimitthedifference betweenthecurrentvalueofFluxDifference (LI)andareference valuewhichcorresponds tothefullpowerequilibrium 3.10-13Proposed valueofAxialOffset(AxialOffset=b,I/fractional power).Thereference valueoffluxdifference varieswithpowerlevelandburnupbutexpressed asaxialoffsetitvariesprimarily withburnup.Thetechnical specifications onpowerdistribution assurethattheF~upperboundenvelopeof2.32timesFigure3.10-3isnotexceededandxenondistributions arenotdeveloped which,atalatertime,couldcausegreaterlocalpowerpeakingeventhoughthefluxdifference isthenwithinthelimits.Thetarget(orreference) valueoffluxdifference isdetermined asfollows.At,anytimethatequilibrium xenonconditions havebeenestablished, theindicated fluxdifference isnotedwithpartlengthrodswithdrawn fromthecoreandwithcontrolBankDmorethan190steps(indicated position) withdrawn.

Thisvalue,dividedbythefractionoffullpoweratwhichthecorewasoperating isthefullpowervalueofthetargetfluxdifference.

Valuesforallothercorepowerlevelsareobtainedbymultiplying thefullpowervaluebythefractional power.Sincetheindicated equilibrium valuewasnoted,noallowances forexcoredetectorerrorarenecessary andindicated deviation of25percentBIispermitted fromtheindicated reference value.Duringperiodswhereextensive loadfollowing is3.10-14Proposed

required, itmaybeimpossible toestablish therequiredcoreconditions formeasuring thetargetfluxdifference everymonth.Forthisreason,twomethodsare3.10-14aProposed feetoutofalignment withitsbank)doesnotresultinexceeding coresafetylimitsinsteadystateoperation atratedpowerandisshortwithrespecttoprobability ofanindependent accident.

Ifinsteadofdetermining thehotchannelfactors,theoperatordecidestoreducepower,thespecified 75%powermaintains thedesignmargintocoresafetylimitsforupto1.12powertilt,usingthe2to1ratio.Reducingtheoverpower tripset,pointensuresthattheprotection systembasisismaintained forsustained plantoperation.

Atiltratioof1.12ormoreisindicative ofaseriousperformance anomalyandaplantshutdownisprudent.Themaximumroddroptimerestriction isconsistent withtheassumedroddroptimeusedinthesafetyanalyses.

Measurement withTgreaterthanoravgequalto540'Fandwithbothreactorcoolantpumpsoperating ensuresthat.themeasureddroptimeswillberepresentative ofinsertion timesexperienced duringareactortripatoperating conditions.

IIThevariouscontrolrodbanks(shutdown banks,controlbanksA,B,C,andD)areeachtobemovedlasabank;thatis,withallrodsinthebankU'ithinonestep(5/8inch)ofthebankposition.

Positionindication isprovidedbytwomethods:adigitalcountofactuation pulseswhichshowsthe3.10-18Proposed

~~demandpositionofthebanksandamicroprocessor rodpositionindication (MRPI)systemwhichindicates theactualrodposition.

Thedigitalcountersareknownasthestepcounters.

Operability ofthecontrolrodpositionindication isrequiredtodetermine controlrodpositions andtherebyensurecompliance withthecontrolrodalignment andinsertion limits.The12steppermissible demandtoindicated misalignment andthe,0steprodtorodindicated misalignment ensuresthatthe25stepmisalignment assumedinthesafetyanalysis"is met.TheMRPIsystemdisplaysthepositionofallrodsonaCRT.AfailureoftheCRTwouldresultinlossofpositionindication oftherodseventhoughtheMRPIsystemisstilloperable.

SincetheMRPIsystemalsotransmits rodpositioninformation tothePlantProcessComputerSyst:em(PPCS),thePPCScanbeusedforrodpositionindication untiltheCRTismadeoperable.

Theactionstatements whichpermitlimitedvaria-tionsfromthebasicrequirements areaccompanied byadditional restrictions whichensurethattheoriginaldesigncriteriaaremet.Misalignment ofarodrequiresmeasurement ofpeakingfactorsora3.10-19Proposed 01\Jk1 restriction inpower;eitheroftheserestrictions provideassurance offuelrodintegrity duringcontinued operation.

Znaddition, thosesafetyanalysesaffectedbyamisaligned rodarereevaluated toconfirmthattheresultsremainvalidduringfutureoperation.

References:

(1)UpdatedFinalSafetyAnalysisReport(UFSAR)Section4.2.3.10-19aProposed TABLE4.1-1MINIMUMFREQUENCIES FORCHECKSgCALIBRATIONS ANDTESTOFINSTRUMENT CHANNELSChannelDescrition1.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.NuclearIntermediate S(l)RangeN.A.P(2)1)Once/shift wheninservice2)Loglevel;bistableaction(permissive>

rodstop>trip)3.NuclearSourceRangeS(l)N.A.P(2)1)Once/shift wheninservice2)Bistableaction(alarm<trip)4.ReactorCoolantTemperature 5.ReactorCoolantFlowSM(l)(2)1)Overtemperature-DeltaT2)Overpower

-DeltaT6.Pressurizer WaterLevel7.Pressurizer PressureS,08.4KvVoltageFrequency 0e9.RodPositionfhIndication N.A.S(1,2)N.A.ReactorProtection circuitsonly1)Withstepcounters2)Logrodpositionindications each4hourswhenroddeviation monitorisoutofservice*Bymeansofthemovablein-coredetectorsystem.**Notrequiredduringhot>cold>orrefueling shutdownbutassoonaspossibleafterreturntopower.

lLg,r>I'1Il-ylIIL4GliW TABLE4.1-1(Continued)

Channel10.RodPositionBankCountersCheckCalibrate N.ATestN.A.Remarks1)Withrodpositionindication 2)Logrodpositionindications each4hourswhenroddeviation monitorisoutofservicell.SteamGenerator LevelS12.ChargingFlow13.ResidualHeatRemovalPumpFlowN.A.N.A.N.A.N.A.14.BoricAcidTankLevelDNABubblertuberoddedweekly15.Refueling WaterStorageTankLevel16.VolumeControlTankLevelN.A.N.A.N.A.N.A.17.ReactorContainment PressureDM(l)1)Isolation Valvesignal18.Radiation Monitoring System19.BoricAcidControlDN.AN.A.AreaMonitorsRltoR9ISystemMonitorR1720.Containment DrainSumpLevelN.A.N.A21.ValveTemperature 4Interlocks 0Q922.Pump-Valve Interlock 23.TurbineTripSet-Point N.A.N.A.N.A.N.A.N.A.M(l)1)BlockTrip24.Accumulator LevelandPressureN.A.

TABLE4.1-2MINIMUMFREQUENCIES FOREQUIPMENT ANDSAMPLINGTESTS1.ReactorCoolantChemistry SamplesTestChlorideandFluorideOxygenFrequency 3times/week andatleasteverythirdday5times/week andatleasteveryseconddayexceptwhenbelow250FFSARSectionReference 2.ReactorCoolantBoronBoronconcentration Weekly3.Refueling WaterStorageTankWaterSampleBoronconcentration Weekly4.BoricAcidTank5.ControlRods6.FullLengthControlRodBoronconcentration RoddroptimesofallfulllengthrodsMoveanyrodnotfullyinsertedasufficient numberofstepsinanyonedirection tocauseachangeofpositionasindicated bytherodpositionindication systemTwice/week Aftervesselheadremovalandatleastonceper18months(1)t1onthly77.Pressurizer SafetyValvesSetpointEachRefueling Shutdown8.MainSteamSafetyValvesSetpointEachRefueling Shutdown109.Containment.

Isolation TripFunctioning EachRefueling Shutdown10.Refueling SystemInterlocks Functioning PriortoRefueling Operations 9.4.5ll.ServiceWaterSystem12.FireProtection PumpandPowerSupplyFunctioning Functioning EachRefueling ShutdownMonthly9.5.59.5.54.1-8Proposed Attachment BDuringtheSpring1987outagetheanalogrodpositionindication (ARPI)systemwillbereplacedwithaWestinghouse microprocessor rodpositionindication (MRPI)system.TheARPIsystemisbeingreplacedbecausethesystemrequiressignificant effortto'aintain alignments, theagingsystemisbecomingpronetocomponent

failures, andsparepartsaredifficult toobtain.Also,replacing theARPIsystemwillresolvehumanengineering discrepencies raisedduringthedetailedcontrolroomdesignreview.AblockdiagramoftheMRPIsystemisillustrated onFigure1.Thesystemconsistsofadigitaldetectorassemblyforeachrod,adatacabinetlocatedinsidecontainment, anddisplayrackslocatedintherelayroom.Rodpositiondataisdisplayed onacolorCRTinthecontrolroomandalsotransmitted totheplantprocesscomputersystem(PPCS).Thedatacabinetinsidecontainment containstwomultiplexers whichtakerodpositioninformation fromeachoftherodsandtransmitittotheprocessors whichareinthedisplayrackslocatedintherelayroom.Oneprocessor suppliesinformation totheCRTlocatedonthecontrolboard,theotherprocessor suppliesinformation tothePPCS.Bothprocessors arerequiredtoproduceaturbinerunbackandblockrodwithdrawal signal.TheMRPIsystemsensesrodpositioninintervals of12stepsforeachrod.Thedigitaldetectorassemblies consistof20discretecoilpairsspacedat12stepintervals asillustrated onFigure2.TheMRPIsystemwillnormallyindicate0rodpositionuntiltherodgoesfromthefifthtosixthstep.Atthattimetheindication willnormallyswitchfrom0to12.Whentherodgoesfromtheseventeenth toeighteenth, theindication willnormallyswitchfrom12to24.Therodwillnormallybewithin+6stepsoftheMRPIindication, however,ifthetransition uncertainty of+2stepsisconsidered therodwillalwaysbewithin+8stepsoftheMRPIindication.

ThechangesmadetotheTechnical Specifications basically replacereferences totheARPIsystemwithreferences totheMRPIsystem,provideclarification whetherindicated positionordemandpositions isrequired, allowthePPCStobeusedasabackuptotheMRPICRTiftheCRTshouldbecomeinoperable, removethecalibration requirement, andmodifytherodmovementtest.Thedetailedchangesaredescribed onTableI.ThePPCSbackupisusedbecauseintheMRPIsystemiftheCRTbecomesinoperable, positionindication islostforallrods,whereas,intheoldARPIsystemthereisoneindicator foreachrod;anindicator failurewouldresult.inlossofpositionindication foronlyonerod.Thesafetyconcernsassociated withreplacing theARPIsystemwiththeMRPIsystemareassociated withgeneration ofaturbinerunback(TR)signal,generation ofablockrodwithdrawal (BRW)signal,andtheabilitytocomplywiththerodmisalignment requirement.

ThecurrentARPIsystemconsistsofonedetectorassemblyperrod.ThedetectorassemblyisinputtoanARPIdrawer(onedrawerprocesses tworods).TheARPIsystemdrawerswillsensearodbottomforanyrodandsendanactuating signaltotheTRandBRWrelays.Thesignalfromonedrawerisrequiredto:generate aTRandBRW.TheMRPIsystemconsistsofonedigitaldetectorassemblyperrod.Allthedetectorassemblies aremultiplexed andbecomeinputtotworedundant MRPIsignalprocessors.

Eachsignalprocessor independently monitorsallrodsandsensesarodbottomforanyrod.Arodbottomsignalfrombothsignalprocessors isrequiredtogenerateaTRandBRW.Thetwooutoftwocoincident reducesinadvertent TRandBRWbutdoesnoteffecttheaccidentanalysisassumptions.

TheroddropanalysisassumesaTRisgenerated byrodbottomindication fromtheRPIsystemornegativefluxrate,whichever ismorelimiting.

Failureofacomponent maypreventaTRfromtheRPIsystembutnotfromthenegativefluxratecircuitry.

However,failureofaprocessor orothercomponents intheMRPIsystemwillbeannunciated onthemaincontrolboard.Thiscondition isthesameastheexistingARPIsystem;failureofthedrawerresponding toadroppedrodwillalsonotproduceaTRfromthepositionindication system.However,theredundant negativefluxrateTRwillstillbeavailable inaccordance withthesafetyanalysis.

TheNRPIsystemisdesignedtosatisfytherodmisalignment requirement.

TheMRPIsystemdetermines rodpositionin12stepintervals.

Thetruerodpositionisalwayswithin28stepsoftheindicated position(k6stepsduetothe12stepintervalandi2stepstransition uncertainty duetoprocessing andcoilsensitivity).'igure 2illustrates ascenariowherearodbecomesstuckatthefourthstep.TheNRPIforthatrodcouldbe12.Sincethestepcounterdoesnot.knowtherodisstuckitwouldcontinuetocount.Theroddeviation alarmwillbegenerated bythePPCSasiscurrently donefortheARPIsystem.Thealarmwouldbegenerated whenthestepcounterreaches24steps(24steps-MRPIindication of12steps=isetpointof12steps).Therefore, themaximumdeviation possibleis24-4or20steps.Thisisboundedbytheaccidentanalysiswhichassumes25steprodmisalignment.

Anotherpossiblesituation istherodtorodmisalignment withinagrouporabank.Thissituation isassociated withSpecifications 3.10.4.3.2a and3.10.5.3a.

UsingFigure2asanaid,assumetheinoperable rodisatstep4.TheMRPIindication forthisrodcouldbe12steps.IftheotherrodswithinthegrouporbankarealignedsothattheirMRPIindicated positionisalso12steps,thehighestactualpositionforanyoftheserodswouldbe19steps.Therefore, iftherodsarerequiredtohavethesameindicated positionthemaximumactualpositiondifference wouldbe19-4or15steps.Thisisboundedbytheaccidentanalysiswhichassumes25stepsrodmisalignment.

Thus,replacing theARPIsystemwiththeMRPIsystemisacceptable providedSpecifications 3.10.4.3.2a and3.10.5.3a arechangedtorequiretheaffectedrodstobealignedtothesameindicated position.

ThefinalsafetyissueconcernsresponsetimefortheTR.TheMRPIsystemprocesses rodpositioninformation severaltimesasecond.Westinghouse hascalculated theresponsetimetobeapproximately onesecond.Thisislessthanthecalculated responsetimeoftheARPIsystem.SincetheMRPIresponsetimeisfasterthantheARPIresponsetime,replacing theARPIsystemwiththeMRPIsystemdoesnotchangetheresultsofthecurrentsafetyanalysis.

Calibration isdefinedinthecurrentTechnical Specification 1.7.1as"Theadjustment, asnecessary, ofthechanneloutputsothatitrespondswiththenecessary rangeandaccuracytoknownvaluesoftheparameter whichthechannelmonitors".

Thisdefinition isinappropriate foradigitalsystem.OncetheMRPIsystemisinstalled andthedigitaldetectorassemblies positioned thesystemdoesnotneedperiodiccalibration.

Sincedriftisnotaproblemwithdigitalequipment therequirement forperiodiccalibration abovehasbeenremovedfromTable4.1-1.Theexistingrequirements forcheckingandtestingwillinsureproperfunctioning oftheNRPIsystem.Therodmovementtest(item6Table4.1-2)requiredmodification becauserodmovementcouldbecheckedbytheNRPIsystemwithrodmovementassmallasonesteporaslargeastwelvesteps(SeeFigure2).Sincerodmovementmaybecheckedwithlessthanatensteprodmotionorasmuchastwelvestep,rodmotionthecurrentrequirement isnolongerappropriate.

Inaccordance with10CFR50.91,thischangetotheTechnical Specifications hasbeenevalutedagainstthreecriteriatodetermine iftheoperation ofthefacilityinaccordance withtheproposedamendment would:l.Involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated; or2.Createthepossibility ofanewordifferent kindofaccidentfromanyaccident, previously evaluated; or3.Involveasignificant reduction inmarginofsafety.Theproposedchangesdonot,involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated becausetheMRPIsystemwillindicaterodmisalignment withintheboundsofcurrentsafetyanalyses, theMRPIsystemresponsetimeisfasterthantheAPRIsystem,andtheresponsetoacontrolroddropcoincident withasystemsinglefailureisessentially thesameasthatoftheARPIsystem.Theproposedchangesdonotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously evaluated becausetheMRPIsystemprovidesthesameinterfaces astheexistingARPIsystem.Thenewprocessing isdigitalversusanalog.FailureofNRPIonlycauseslossofindication whichisconsistent, withafailureoftheAPRIsystem.

Theproposedchangesdonotinvolveasignificant reduction inmarginofsafetybecausetheexistingboundsusedinthesafetyanalysisfortheARPIsystemareapplicable totheMRPIsystem.'herefore, anosignificant hazardsfindingiswarranted fortheproposedchanges.

~~'FIGURE,MRPI',;SUBSYSTEM ARCHITECTURE DETEC.TORS..B.,DATACABINETMANUALSELECTORSWITCHESINSIDECONTAINMENT OUTSIDECONTAINMENT 8RGBALPHAVIDEOVIDEOSUPPORT'CA,RD2/2D/ACONVERTER SURGESUPPRES-SIONDISPLAYRACKS(RELAYROOM)CRTCONTROLROOMMCBTURBINERUNBACKMCBCOMPUTERMUXRELAYROOM I

NoraelOperation FIGURE2XLLUSTRATON OFHRPIINDICATION StuckRodactualrodposition4342414039383736353433323130292827262524232221201918171615141312ll109876543210stepcounter434241~4393837363534333231302927262524232221201918171615141312ll1087543210HRPIdisplay362412actualrodposition4(stuck)3210stepcounter434241Q039383736353433323130292Q272625242322212019'1171615141312ll1098543210NRPIdisplay121212dottedlineindicates transition uncertainty associated withprocessing andcoilsensitivities

~~Table1DetailedTechnical Specification ChangesLocationDescritionofCheReasonforChepg.3.5-7item16changed30"to48stepswiththeMRPIsystemallindications areinstepvsinches,48stepsisecpivalent to30inches.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.3.10-8section3.10.4.3.2 added"(zndzcated)"

added"(indicated)"

removed"within&+2stepsof"added"thesameindicated positionas"operatorclarificationcperatorclarification maintainuncertainty withinthesafetyanalysisassumption of25stepsadded"(indicated position)

"operatorclarificationadded"(demandposition)"

operatorclarification pg.3.10-9section3.10.5.1pg.3.10-10section3.10.5.2removetheword"analog"added"(demandposition)"

Plremovetheword"analog"added"(demandposition)"

removereference toARPIsystemoperatorclarificationreravereference toARPIsystemoperatorclarification

'g.3.10-10section'.10.5.3 allowsindication tobebytheMRPIsystenorPPCSmaintainuncertainty withinthesafetyanalysisassumption of25stepsreplaced, "indicator" with"indication" "removed"mostwitMrawnrodandleastwithdrawn rcdofthebankarewithinamaximumof12stepsofeachother'"added"rodsofthebankareatthesaneindicated position" pg.3.10-13topofpagechanged24to25safetyanalysisassumes25stepspg.3.10-14middleofpagepg.3.10-14apg.3.10-18pageaddedpartofpage3.10-18isnewonpage3.10-19retypingrecpiredadditional pageadded"(indicated position)"

operatorclarification 0~~rh LocationDescritionofReasonforChanepg.3.10-19todoretyping, partofpage3.10-18isnowonpage3.10-19linearpositionindicator replaceARPIwithbSPI(LVDT)replacedwithmicro-processor rodpositionindication (MRPI)systemreference 2wasrenovedFSAR,Section7.3doesnotdescribethenewMRPIsystemreworded"Theseareknownasthestepcountersandanalogredpositionindication respectively",

to,"Thedigitalccuntersareknownasthestepcounters".

redundent changedindicators toindication allowindication tobebytheMRPIsystemorPPCSremoved"(7.5inches)"replaced"15inches"with"25steps"withtheMRPIsystemallindications areinstepsvs.inchesaddedadiscussion onusesofthePECSasbackuptoCRTallerPECSasbackuptoCRTpg.3.10-19apg.4.1-5item4updatedreference 1removedreference 2addednote(2)updatedreference toUFSARFSAR,Section7.3doesnotdescribethenewnmIsystemthisnotewasinadvertently anittedwhenthispagewasre~forAdmend-ment21pg.4.1-5item9changed"AnalogRodPosition" to"RodPositionIndication" allowindication tobebytheMRPIsystemorPPCSrenovethecalibration recpirenents digitalsystemsarenotsubjecttoinstrumntdriftchange"analogrcdpositions" to"rodpositions indications" allerindication tobebytheMRPIsystemorPPCS LocationDescritionofReasonforChanepg.4.1-6item10changed"analogredallcwindication tobebyposition" to"rodpositiontheMRPIsystemorPECSindication" pg.4.1-8item6changed"analogrodpos3.'t3.ons" to"rodpositionindications" changedTestto"Moveanyrodnotfullyinsertedasufficient numberofstepsinanyonedirection tocauseachangeofpositionasindicated bytherodpositionindication systemaminimimmovementof10stepsisinappropriate forthenewsystem.Arodmovementof1to12stepswillcauseanindication changeontheMRPIsystem.

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