ML17331B093

Provides Supplemental Info Re Instrument Drift in Response to NRC Request on 930416 TS Interval Extensions for Cycle 9 to Avoid Unnecessary Shutdown

ML17331B093
Person / Time
Site:	Cook
Issue date:	12/03/1993
From:	FITZPATRICK E INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17331B094	List: ML17331B093 ML17331B095
References
AEP:NRC:1181C, NUDOCS 9312100055
Download: ML17331B093 (44)

Text

,ACCELERATED ISTRIBUTION DEMOTRATIONSYSTEM<s.REGULATORY INFORMATION DXSTRXBUTION SYSTEM(RIDS)ACCESSION NBR:9312100055

,DOC.DATE:

93/12/03NOTARIZED:

NODOCKETFACXL:50-316 DonaldC.CookNuclearPowerPlant,Unit2,IndianaM05000316AUTH.NAMEAUTHORAFFILIATION FXTZPATRXCK,E.

XndianaMichiganPowerCo.(formerly Indiana6MichiganEleRECXP.NAME RECIPXENT AFFILIATION MURLEY,T.E.

DocumentControlBranch(Document ControlDesk)SUBZECT:Providessupplemental inforeinstrument driftinresponsetoNRCrequeston930416TSintervalextensions forCycle9toavoidunnecessary shutdown.

DISTRIBUTION CODE:AOOIDCOPIESRECEIVED:LTR (ENCL(SIZE:+TITLE:ORSubmittal:

GeneralDistribution=-

NOTES'RECIPIENT IDCODE/NAME PD3-1LAWETZEL,BINTERNAL:

NRR/DE/EELB NRR/DRCH/HICB NRR/DSSA/SPLB NUDOCS-ABSTRACT OGC/HDS2EXTERNAL:

NRCPDRCOPIESLTTRENCL1122111111111011RECIPIENT IDCODE/NAME PD3-1PDNRR/DORS/OTS BNRR/DRPWNRR/DSSA/SRXB CBE01NSXCCOPIESLTTRENCL11111111101111DDRDNOTETOALL"RIDS"RECIPIENTS:

D~:,rDPLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMP1-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISISFORDOCUMENTS YOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:

LTTR16ENCL14 It1~ea"4 IndianaMichip~PowerComp~P.O.Box1663>Coiumbus, OH43216AEP:NRC:1181C DonaldC.CookNuclearPlantUnit2DocketNo.50-316LicenseNo.DPR-74SUPPLEMENTAL INFORMATION CONCERNING SURVEILLANCE INTERVALEXTENSION FORUNIT2CYCLE9U.S.NuclearRegulatory Commission DocumentControlDeskWashington, D.C.20555Attn:T.E.MurleyDecember3,1993

DearDr.Murley:

InourApril16,1993,AEP:NRC:1181 letterwerequested certaintechnical specification intervalextensions fortheDonaldC.CookNuclearPlantUnit2Cycle9toavoidanunnecessary shutdown.

Thepurposeof.thisletter.istoprovidesupplemental information regarding instrument drift,asrequested byyourstaff.The-instrument driftdataiscontained inAttachment 1.Wearealsoproviding anupdateofthetechnical specifications thatrequireanextension.

Thisinformation iscontained inAttachments 2through4.Webelievethattheproposedchangeswillnotresultin1)asignificant changeinthetypesofeffluents orasignificant increaseintheamountofanyeffluents thatmaybereleasedoffsite,or2)asignificant increaseinindividual orcumulative occupational radiation exposure.

TheseproposedchangeshavebeenreviewedandapprovedbythePlantNuclearSafetyReviewCommittee andwillbereviewedbytheNuclearSafetyDesignReviewCommittee atthenextscheduled meeting.Incompliance withtherequirements of10CFR50.91(b)(1),

copiesofthisletteranditsattachments havebeentransmitted toMr.J.R.PadgettoftheMichiganPublicServiceCommission andtotheMichiganDepartment ofPublicHealth.9312100055 931203PDRADOCK05000316 PPDR IIlv'1 Dr.T.E.MurleyAEP:NRCt1181C Thisletterissubmitted pursuantto10CFR50.30(b),

and,assuch,anoathstatement isattached.

Sincerely, p~)VicePresident Attachments cc:A.A.BlindG.CharnoffJ.B.Martin-RegionIIINFEMSectionChiefNRCResidentInspector J.R.Padgett Dr.T.E.Murley3AEP:NRCfl181C bc:S.J.BrewerD.H.Malin/K.J.Toth/M.I.TerryM.L.Horvath-Brldgman-w/oattachments J.B.Shinnock-w/oattachments W.G.Smith,Jr./S.H.Steinhart/R.

C.CarruthJ.B.Hickman,NRC-Washington, D.C.B.A.Wetzel,NRC-Washington, D.C.AEP:NRC:1181CDC-N-6015.1 w/oattachments STATEOFOHIO)COUNTYOFFRANKLIN)

E.E.Fitzpatrick, beingdulysworn,deposesandsaysthatheistheVicePresident oflicenseeIndianaMichiganPowerCompany,thathehasreadtheforgoingREQUESTFORADDITIONAL INFORMATION CONCERNING SURVEILLANCE INTERVALEXTENSION FORUNIT2CYCLE9andknowsthecontentsthereof;andthatsaidcontentsaretruetothebestofhisknowledge andbelief.Subscribed andsworntobeforemethis~~dayof19~9NOTARYPUBLICRlTADHILLNOTARYPUBLIC.STATEOFOHIO fLil~-'~e'>p Attachment 1toAEP:NRC:1181C Supplemental Information onInstrument DriftforDonaldC.CookNuclearPlantUnit2 Attachment 1toAEP:NRC:1181C Page1ThedatainTables1(Pressurizer Water.LevelDrift),2(Pressurizer PressureDrift)and3(RTDDrift)clearlyindicatethatinstrument driftwillbewithinacceptable limitswhileoperating intherequested surveillance extension period.PRESSURIZER WATERLEVELCHANNELCALIBRATION ForthePressurizer WaterLevelchannelcalibration, weareonlyseekingasurveillance extension foroneofthethreechannels, NLP-153,asdescribed inAEP:NRC:1181 (April16,1993).NLP-151andNLP-152canbecalibrated atpowerwithoutplacingtheunitinjeopardy.

However,wehaveprovideddatafor.allthreesetsofinstruments sincethe"asfound"dataforNLP-153forthelastsurveillance wasunusableforthisanalysis.

Discussion concerning thisdataappearsattheendofthisattachment.

Table1providesinformation onthemaximumallowedpercentspanerror(+5.27%,-3.27%),tripsetpoint(92%ofspan),driftextrapolation methodology, andmargintotripsetpointcalculation methodology.

TablelAcontainsthemeasured"asfound"and"asleft"dataforthepastthreesurveillances.

Table1Bliststheresultsofthedriftextrapolation calculations andcomparisons totheprotective tripsetpoints.

Ascanbeseenbyexamining theextrapolated percentspanerrorresultsinTable1Bandcomparing themtothemaximumallowedpercentspanerroratthepressurizer waterlevelhighreactortripsetpoint, excessmarginexists.Thesmallestamountofmargin(extrapolated toAugust13,1994)atthetripsetpointis+0.06%onNLP-153basedontheAugust24'990@calibration data.Allotherextrapolations yieldedexcessmarginofatleast1.35%tothetripsetpoint.

Basedontheresultsofthisanalysis, webelievethatthedriftassociated withNLP-153willbewithintherequiredmargintothetripsetpointandwillnotadversely impactthesafeoperation oftheplant.PRESSURIZER PRESSURECHANNELCALIBRATION ForthePressurizer Pressurechannelcalibration, weareonlyseekingasurveillance extension fortwoofthefourchannels, NPP-153andNPS-153,asdescribed inAEP:NRC:1181.

NPP-151andNPP-152canbecalibrated atpowerwithoutplacingtheunitin)eopardy.

Table2providesinformation onthemaximumallowedpercentspanerror.(f3.25%),

tripsetpoint(lowsetpoint=1950psior31.25'4ofspan;highsetpoint=2385psior85.625%ofspan),driftextrapolation methodology, andmargintotripsetpointcalculation methodology.

Table2Acontainsthemeasured"asfound"and"asleft"dataforthepastthreesurveillances.

Table2Bliststheresultsofthedriftextrapolation calculations andcomparisons totheprotective tripsetpoints.

Ascanbeseenbyexamining theextrapolated percentspanerrorresultsinTable2Bandcomparing themtothemaximumallowedpercentspanerroratthepressurizer pressurelowandhighreactortripsetpoint, excessmarginexists.

Attachment 1toAEP:NRC:1181C Page2Thesmallestamountofmargin(extrapolated toAugust13,1994)atthelowtripsetpointis+0.71%onNPS-153basedontheJuly25,1988,calibration data.Thesmallest.amount.ofmargin(extrapolated toAugust13,1994)atthehightripsetpointis+0.50%,alsoonNPS-153basedontheJuly25,1988,calibration data.Allotherextrapolations yieldedexcessmarginofatleast1.61%tothetripsetpoints.

Basedontheresultsofthisanalysis, webelievethatthedriftassociated withNPP-153andNPS-153willbewithinourmaximumallowedpercentspanerror,bewithintherequiredmargintothetripsetpoints, andwillnotadversely impactthesafeoperation oftheplant.RTDCHANNELCALIBRATION Asdescribed inAEP:NRC:1181, weareseekingrelieffromallT/Ssurveillances whicharedependent ontheRTDchannelcalibration.

Table3providesinformation onthe'maximum allowedtemperature deviation (NarrowRange[NR]:21.2'FandWideRange[WR):f8.4'F)andonthedriftextrapolation methodology.

Tables3Aand3Bcontainthemeasureddataforthepastthreesurveillance intervals ontheNarrowRangeRTDsandWideRangeRTDs,respectively.

Tables3Cand3Dlisttheresultsofthedriftextrapolation calculations forNarrowRangeRTDsandWideRangeRTDs,respectively.

Thedatapresented intheMarch5,1989,columninTables3Cand3Dshowthatalltemperature deviations fortheNRandWRRTDsarewithinthemaximumalloweddeviation.

Thisissignificant sincethetimeperiodbetweensurveillances wasapproximately 33months,orsevenmonthsgreaterthanthecurrentextension thatwearerequesting.

Intheothertwosurveillance intervals, thereareafewextrapolated driftdatapointswithvaluesoutsideourmaximumalloweddeviation.

Webelievethesedatapointstobeinsignificant becausetheRTDsareinherently stableandourapplication oflinearextrapolation toestimatedriftisconservative, asfollows.Asmentioned before,thedriftmeasuredoverthe33monthintervalhadnotemperature deviations exceeding ourmaximumalloweddeviations.

Sincethatintervalwasgreaterthantheintervalwearerequesting (26months),wedidnothavetoextrapolate anydatatoestimatethedrift.Also,comparison ofthemeasureddatafromJune1986toJune1992showsthatoverthesixyearintervalthemaximum"drift"fortheNRRTDswas1.08'F(RTD2-TE-421Bat250'F)andfortheWRRTDswas5.60'F(RTD2-TE-413B at527'F),whichiswellwithinthemaximumalloweddeviation.

Thisisanacceptable comparison sincethedatathatisbeingcomparedisdirectlyofftheRTDsandcannotbeadjustedfromonecycletothenext.Thus,basedonthe33monthintervalandasixyearintervalweshowthattheRTDsarestableandlinearextrapolation ofthedataisconservative.

Anotherfactorwhichwebelievecontributed tothefewextrapolated driftdatapointsexceeding themaximumalloweddeviations wasdifferences intheindividual looptemperatures.

Thisisveryapparentuponexamination oftheWRRTDsat350'Fand250'FduringOctober1990,wheretheindividual loopshavedeviations ofsimilarmagnitudes butinoppositedirections.

Alloftheextrapolated driftdatapointswhichwereoutsidethemaximumalloweddeviation wereaffectedbytheOctober.1990 data.Notethatthemeasureddeviations wereallwithinthemaximumalloweddeviation forthatsurveillance.

1lIIL

~l(p(I'IAttachment 1toAEP:NRC:1181C Page3Finally,thestability oftheRTDsisevidentinthatoverthethreesurveillance intervals, alloftheRTDsat527'F(closesttooperating temperature) hadanextrapolated driftlessthanthemaximumalloweddeviation.

Basedontheresultsofthisanalysis, webelievethatthedriftassociated withtheNarrowRangeandWideRangeRTDswillremainwithinourmaximumalloweddeviation andwillnotadversely impactthesafeoperation oftheplant.RVLISCalibration WecannotprovideanydriftdataonRVLZSsincethetransmitters werereplacedduringthemostrecent,refueling outageaspartofits10yearrecommended replacement frequency.

Evenwithoutthedriftdata,webelievethatwewouldbeawareofexcessive driftthroughtheT/Srequiredmonthlychannelchecksperformed onthetwoindependent trainsofindication.

Attachment 1toAEP:NFIC:1181 CTable1Page4PRESSURIZER WATERLEVELDRIFTSeekinganExtension onlyforNLP-153(SetIII)MaximumAllowed%S anErrorandTechnicalS ecificaton TriSetointBasedonWCAP13801,Table3-8MaximumAllowed%SpanError=+5.27%,-3.27%Technical Specification TripSetpoint=92%ofInstrument SpanSurveillance IntervalExtrapolation Factor(SIEF)Instr8NLP-151(N-4)07/01/86Calibration DateExtension Date(N)(N-3)(N-2)(N-1)09/03/8808/24/9004/21/9208/13/94SIEF(N-3)(N-2)1.06161.1722(N-1)1.3927NLP-152NLP-15307/01/8607/01/8609/03/8809/01/8808/24/9004/21/9208/13/9408/22/9004/20/9208/13/941.06161.17221.06561.17361.39271.3921ExamIe:SIEFcalculation forNLP-153inAril92SIEF(N-1)

=[N-(N-1)]/[(N-1)-(N-2)]=[08/13/94-04/20/92]/[04/20/92-8/22/90]=1.3921Calculation ofExtraolated%SanErrorE=(SensorDrift)x(SIEF)+RackErrora0.515where:SensorDrift=(AsFound-AsLeA)/(Span)Span=0.4VDCRackError=MeasuredRackErrora0.515=a[0.5(MaxAllowedSensorM8TE)+0.015(ActualRackM&TE)]a0.515MBTEerrorisaddedin"like-sign" direction foreachextrapolation MeasuredRackErrorsInstr.0NLP-151NLP-15209/8808/90-0.125-0.100-0.050-0.05004/92-0.0500.000Note:Atpowermonthlychannelfunctional testingperformed onRacksasassumedbyWCAP13801.Theabovedataistreatedinaccordance withtheWCAPinaconservative fashion.Calculation ofMarintoTSTriSetointM:E(92)=[E(100)-E(75)]x[92-75]/[100-75]+E(75)ExcessMarginto-3.27%:M=E(92)-(4.27%)ExcessMarglnto+5.27%:

M=5.27%-E(92) where:E(P)=%SpanErrorat%Span(P) 1IEIAttachment 1toAEP:NRC:1181 CPage5Table1APressurizer WaterLevelMeasuredDataNLP-151Nominal09/03/8808/24/9004/21/92Scalep25%inputH2VDG2350.10003120.2203AsFoundAsLeft0.11310.10100.23220.2200AsFound0.09800.2158AsLeftAsFoundAsLeft0.10120.09530.10120.21910.21530.21995p3890.34060.35190.33950.33500.33920.33560.339975%100%100%75%50%25%p4680.46404910.50000.22033122350.10004910.50004680.46403890.34060.47600.46360.51230.49990.51250.50000.47590.46360.35190.33990.23210.22010.11310.10090.45880.49560.49500.45880.33500.21580.09800.46350.45940.46390.49970.49540.50020.49970.49500.49980.46360.45820.46310.33950.33450.33920.21900.21440.21940.10120.09540.1006ScalepNominalInputH2244NLP-15209/03/8808/24/90AsLeft0.1001VDCAsFoundAsLeft*AsFound0.10000.10910.10100.104404/21/92AsFoundAsLeft0.30120.100025%5p75%100%100%75%50%25%p3083724365005004363723082440.20000.20760.22020.22220.30000.30600.34030.34130.40000.40580.46470.46370.50000.50600.50100.50070.50000.50600.50130.50070.40000.40590.46460.46380.30000.30630.34000.34130.20000.20770.22020.22220.10000.10900.10120.10440.21950.33960.46370.49940.49970.46380.33960.21940.10010.41880.21930.53810.34010.66260.46480.69880.50180.69880.50180.66240.46510.53820.34010.41880.21930.30110.1000NominalScaleInputH2VDCNLP-15309/01/8808/22/90AsFoundAsLeftAsFoundAsLeft04/20/92AsLeftAsFoundp25%50%75%100%100%2353123894684914910.10000.22030.34060.46400.50000.50000.10690.22100.34090.46640.50330.50340.10030.08580.10020.21980.20680.21900.34030.32900.33910.46480.45580.46300.50060.49270.50030.50100.49270.50080.03410.13710.25590.37930.41530.41540.10020.22010.34020.46490.50130.50084683895p25%-3120.46400.34060.22030.46770.35400.23130.46490.45580.46400.34050.32900.33420.21980.20680.21900.37900.25500.13580.46420.34010.21900%2350.10000.10590.10040.08580.10020.03410.1009*Seefollowing pageforcomments-

'sI~~Attachment 1toAEP:NRC:1181 CPage6Table1A(continued)

Pressurizer WaterLevelMeasuredDataNLP-152Calibration DataChange09/03/88OriginalCalibration Data09/03/88Calibration DataChange2440%30825%5p37275%-436ScaleInputH2VDCAsFoundAsLeft0.10000.10910.10100.20000.20760.20000.30000.30600.29940.40000.40580.4001Scale0%30%GQ%91%3210.2203398034064770.4640InputH2VDC2440.1000AsLeft0.10100.22020.34030.46471PQ%100%75%50%25%0%5005004363723082440.50000.50600.50100.50000.50600.50130.40000.40590.40020.30000.30630.29960.20000.20770.20010.10000.10900.1012100%100%91%60%30%0%5000.50005000.50004770.46403980.34063210.22032440.10000.50100.50130.46460.34000.22020.1012AftertheSep88calibration, thenominalVDCcalibration pointforNLP-152waschangedtomatchthatofNLP-151andNLP-153forhumanfactorsreasons.Thus,the"asleft"datafromtheSep88calibration, whichwasmeasuredattheoriginalinputwaterlevels,neededtobeadjustedtothenewinputwaterlevelstomakeitcomparable totheAug90calibration data.Thiswasaccomplished bylinearlyinterpolating onthe"asleft"datafromSep88forthenewcalibration inputwaterlevels.Thisprovided"asleft"datafromSep88whichcouldbecomparedtothe"asfound"datafromAug90.

IilI~IAttachment 1toAEP:NRC:1181C Page7Table1BPressurizer WaterLevelExtrapolated

%SpanErrorNLP-151Scale09/03/880%3.28%25o/o29850%2.82%75%3.00%100%3.07%100%3.12%75%2.97%50%2.82%25%2.95%0%3.28%SensorDrift08/24/9004/21/92-0.75%-1.48%-105%-095%-1.13%-090%-1.20%-1.03%-1.08%-1.07%-1.25%-1.18%-1.2Pyo-1.35%-1.22%-1.25%1.08%-1.15%-0.73%-1.45%Extraolated%S09/03/8808/24/903.87%-1.49%355%-1.85%339%193%357%-2.02%365%188%3.71%-2.08%3.55%-2.02%3.39%<<2.05%3.52%-1.88%387%146anError04/21/92262'g-1.82%199%2.0622P2.45%2.31%2.17%2.58%SanError92%TriSetointMarInto-3.27%192%Tri SetointMarinto+5.27%92%TriSetoint363%-192%6.90%1.35%1.64%7.19%-2.04%1.23%731%SensorDriftNLP-152Extraolated%SanErrorScale0%25%5p75%1pp%100%5p09/03/8808/24/90228%085%1.90%0.50%1.50%0.25%1.45%-0.26%150%-007%150%-015%1.47%-0.21%1.58%0.32%04/21/9209/03/885028%28849.83%2.48%49.63%2.06%49.73%2.00%49.85%2.06%4978%20649.65%2.03%4965%2.14%08/24/9004/21/921.46%105%0.76%0.87%-065%P74-P.810.84%25%p1.93%0.50%2.25%0.80%49.85%2.51%50.25%2.85%%SanErrorI92%TriSetoint2.04%Marinto-3.27%I92%TriSetoint5.31%Marinto+5.27%92%TriSetoint3.23%105%1.40%-0.72%2.55%5ggxxx=Resultsnotconsidered foranalysis.

Discussion atendofattachment.

Attachment 1toAEP:NRC:1181 CPage8Table1B(continued)

Pressurizer WaterLevelExtrapolated

%SpanErrorNLP-153SensorDriftExtraolated%SanErrorScalep25%50%75%100%100%75%50%25%p09/01/8808/22/9004/20/92173%-363%-1653P.18%-3.25%-2Q.48%PP7%-2.82%-2P.8P%0.60%-2.25%-20.93%0.82%-198%2125P.85%-2.P7%-21.35%0.92%-2.28%-21.25%335%288%-198Q%2.75%-3.25%-2P.8P%148%"365%1653%09/01/882.10%-0.58%-P69%0.90%1.14%1.17%1.25%3.83%3.20%1.84%08/22/9004/20/92-5.04%-4.60%-4.11%'3.43%-3.11%323%3.46%-4.16%-460%5.07%'XX%SanError92%TriSetointMarinto-3.27%@92%Tri SetointMarinto+5.27%92%TriSetoint1.07%4.34%4.20%-3.21%pp6%8.48%xxx=Resultsnotconsidered foranalysis.

Discussion atendofattachment.

1,~pI~IAttachment 1toAEP:NRC:1181C Page9Table2PRESSURIZER PRESSUREDRIFTSeekinganExtension onlyforNPP-153(SetIII)andNPS-153(SetIV)MaximumAllowed%SanErrorandTechnical Secification TriSetpintsBasedonWCAP13801,Table3-7MaximumAllowed%SpanError=a3.25%Technical Specification TripSetpoint(High)=2385psi=85.625%ofInstrument SpanTechnical Specification TripSetpoints (Low)=1950psi=31.25%ofInstrument SpanSurveillance IntervalExtrapolation Factor(SIEF)Instr¹Calibration Date(N-4)(N-3)(N-2)(N-1)Extension Date(N)(N-3)SIEF(N-2)(N-1)NPP-153NPS-15307/01/8607/26/8808/23/9004/22/9207/01/8607/25/8808/23/9004/23/9208/13/941.115108/13/941.11521.11211.38651.10941.3826Examle:SIEFcalculation forNPP-153inAril92SIEF(N-1)

=[N-(N-1)]/[(N-1)-(N-2)]=[08/13/94-04/22/92]/[04/22/92-08/23/90]=1.3865Calculation ofExtraplated%SanErrorE:E=(SensorDrift)x(SIEF)+RackErrora0.25%where:SensorDrift=(AsFound-AsLeft)/(Span)Span=0.4VDCRackError=MeasuredRackErrort0.25=(MaxAllowedSensor&RackM8TEByProcedure) t0.25MBTEerrorisaddedinconservative direction foreachextrapolation Instr407/88NPP-153-0.475NPS-1530.07508/9004/92-0.250-0.2500.2000.150MeasuredRackErrorsNote:Atpowermonthlychannelfunctional testingperformed onRacksasassumedbyWCAP13801.Theabovedataistreatedinaccordance withtheWCAPinaconservative fashion.Calculation ofMarintoTSTriSetointM:E(85.625)

=[E(100)-E(75)]x[85.625-75]/[100-75]+E(75)E(31.25)=[E(25)-E(50)]x[25-31.25]/[25-50]+E(50)Marginto-3.25%:M=E(P)-(-3.25%)Marginto+3.25%:M=3.25%-E(P)where:E(P)=%SpanErrorat%Span(P) t'IeIIIAttachment 1toAEP:NRC:1181C Page10Table2APressurizer PressureMeasuredDataScalepNominal17260.1InputPSIVDCNPP-15307/26/88AsFoundAsLeft0.10530.098808/23/90AsFoundAsLeft0.10120.099004/22/92AsFound0.099925%5p75%100%100%75%50%25%p1926212623262526252623262126192617260.20.30.40.50.50.40.30.20.10.20540.19880.30560.29920.40680.40000.50650.50000.50650.50030.40680.40030.30560.29940.20540.19870.10530.09840.20220.19950.30280.30030.40340.40090.50380.50030.50430.50150.40340.40040.30310.29960.20200.19900.10160.09890.20400.30390.40260.50180.50180.40220.30260.20230.1014Scale0%17260.1NominalInputPSIVDCNPS-15307/25/88AsFoundAsLeft0.10660.100508/23/90AsLeft0.0998AsFound0.100004/23/92AsFound0.097325%50%75%100%100%75%50%25%0%1926212623262526252623262126192617260.20.30.40.50.50.40.30.20.10.20680.20660.30710.30050.40860.40120.50880.50100.50920.50100.40960.40100.30840.30000.20780.20030.10810.09980.20040.30080.40180.50230.50250.40200.30100.20080.10090.20050.30110.40100.50100.50180.40100.29990.19990.10000.19800.29830.39940.49960.49960.39970.29900.19850.0983 C~~IAttachment 1toAEP:NRC:1181C Page11Table2BPressurizer PressureExtrapolated

%SpanErrorNPP-153SensorDriftExtrapolated

%SpanErrorScale07/26/8808/23/9004/22/9207/26/8808/23/9004/22/920%1.33%060%023%1.25%0.67%0.31%25%1.35%50%140%75%1.70%100%1.62%085%112%0.90%090%0.85%0.43%0.95%0.38%1.28%0.95%1.34%1.00%167%095%1.59%1.06%1.56%1.25%059%0.52%100%75%5p1.62%170%140%1.00%0.08%0.77%0.45%0.92%0.75%159%1.11%1.67%0.86%1.34%1.03%-0.40%0.62%1.04%25%1.35%0.83%0.82%'l.28%0.92%1.14%p133%0.80%0.63%%SpanError31.25%TriSetpoint%SpanError@85.625%TripSetpointMarinto-3.25%I31.25%TriSetMarinto+3.25%I31.25%TriSet.Marinto-3.25%I85.625%TriSetMarinto+3.25%85.625%TriSet.125%089%1.29%095%164%099%454%420%1.96%2.30%4.89%4.24%1.61%2.26%087%1.12%p56%4.37%213%3.81%2.69NPS-153SensorDriftExtrapolated

%SpanErrorScale07/25/880%165%25%1.70%50%1.78%75%2.15%100%2.20%08/23/9004/23/92-0.13%-0.63%1.55%-0.63%0.08%-0.70%015%-040%0.32%-0.35%07/25/8808/23/902.17%0.31%222%-177%2.30%0.53%272%062%2.78%0.81%04/23/92-096%-0.96%-1.07%-065%-P58100%2.30%0.37%-0.55%2.89%087%-086%5p2,1P195%25%0%2.03%75%2.40%025%-033%0.25%-0.23%0.13%-0.35%028%-043%3.00%073%2.67%073%2.50%0.59%258%0.76%p55-0.41%058%-0.69%%SpanError31.25%TripSetoint%SpanError@85.625%TripSetpointMarinto-3.25%@31.25%

TriSet.Marinto+3.25%Q31.25%TriSet.Marinto-3.25%I85.625%TriSetMarinto+3.25%85.625%TriSet.2.54%0.62%2.75%0.70%5.79%3.87%0.71%2.63%6.00%395%050%255%-P54%062%271%3.79%263%3.87%

Attachment 1toAEP:NRC:1181C Page12Table3NARROWRANGEandWIDERANGERTDDRIFTMaximumAllowed'FDeviation Procedure AccetanceCriteria:

NarrowRange:k1.2'FWideRange:a8.4FSurveillance IntervalExtrapolation Factor(SIEF)TempCalInt(N-2)N-4(N-3)(N-1)ensionDate(N)(N-3)SIEF(N-2)(N-1)527'F06/21/8603/05/8910/11/9006/08/92450'F06/20/8603/05/8910/09/9006/08/92350'F06/19/8602/28/8910/07/9006/08/92250'F06/18/8602/28/8910/06/9006/06/9208/13/9408/13/9408/13/9408/13/940.80571.36070.80491.36540.80811.35840.80931.36411.31351.30921.30491.3103Examle:SIEFcalculation for527'FinJune92SIEF(N-1)

=[N-(N-1)]/[(N-1)-(N-2)]=[08/13/94-06/08/92]/[06/08/92-10/11/90]=1.3135ExcetiontoSIEFN-3Jun86toFeb/Mar89:SinceSIEF(N-3) isapproximately 0.8,avalueof1.0wasconservatively usedinthedriftextrapolations.

InotheNvords, theintervalbetweenthemeasureddata(33months)isgreaterthantheextendedintervalbeingrequested (26months).Calculation ofExtraplatedDrift:Extrapolated Drift=[RTD(n)-RTD(n-1)]

xSIEF(n)where:RTD(n)=measureddeviation duringsurveillance (n)RTD(n-1)=measureddeviation duringsurveillance (n-1)[previous intewal]

CIIAttachment 1toAEP:NRC:1181C Page13Table3ANarrowRangeRTDsMeasuredData('FDeviation fromAverageRCSTemperature) 527'F450'FRTD¹06/21/8603/05/8910/11/9006/08/9206/20/8603/05/8910/09/9006/08/922-TE-410A

-0.040.24-0.150.000.09-0.16-0.070.032-TE-410B 2-TE-411A

-0.01-0.020.230.130.04-0.08-0.16-0.14-0.230.130.07-0.15-0.07-0.021.05-0.092-TE-411B0.12-0.40-0.05-0.04-0.200.27-0.96-0.042-TE-420A 2-TE-420B 2-TE-421A 2-TE-421B-0.12-0.180.040.010.150.030.200.140.030.130.390.03-0.01-0.01-0.12-0.07-0.06-0.180.220.010.010.150.010.060.030.410.110.08-0.10-0.010.060.102-TE-430A 0.140.200.01-0.11-0.01-0.140.01-0.062-TE-430B

-0.120.000.05-0.04-0.14-0.050.01-0.132-TE-431A

-0.050.260.05-0.160.05-0.220.02-0.182-TE-431B-0.010.07-0.100.00-0.07-0.07-0.14-0.022-TE-440A 2-TE-440B 2-TE-441A 0.00-0.37-0.08-0.010.04-0.26-0.060.040.100.120.100.13-0.010.14-0.060.270.020.020.040.060.030.000.870.012-TE-441B0.06-0.380.05-0.04-0.040.33-0.96-0.14RTD¹2-TE-410A 2-TE-410B 0.020.010.18-0.21-0.030.81350'F06/19/8602/28/8910/07/90-0.10-0.0606/08/9206/18/860.080.110.09-0.270.000.84250'F02/28/8910/06/9006/06/920.14-0.082-TE-411A 2-TE-411B 2-TE-420A 0.110.15-0.110.02-0.11-0.72-0.010.200.070.10-0.040.40-0.010.020.25-0.11-0.270.280.02-0.440.000.08-0.030.282-TE-420B

-0.030.070.060.08-0.210.05-0.040.032-TEC21A2-TE-421B2-TER30A-0.120.12-0.040.05-0.090.10-0.11-0.04-0.010.050.080.09-1.060.010.10-0.050.13-0.11-0.030.24-0.110.110.020.022-TE-430B

-0.11-0.100.03-0.18-0.21-0.10-0.07-0.312-TE-431A 2-TE-431B-0.090.09-0.02-0.090.00-0.110.26-0.11-0.22-0.210.03-0.08-0.11-0.11-0.07-0.282-TE-440A

-0.01-0.070.010.040.370.04-0.020.072-TE-440B 2-TE-441A 2-TE-44180.07-0.020.63,-0.06-0.02-0.030.040.15-0.67-0.01-0.01-0.140.030.280.160.050.710.09.-0.06-0.520.000.01-0.010.01 7PaI~gAttachment 1toAEP:NRC:1181C Page14Table3BWideRangeRTDsMeasuredData('FDeviation fromAverageRCSTemperature)

RTD¹527'F06/21/8603/05/8910/11/9006/08/9206/20/86450'F03/05/8910/09/9006/08/922-TE-413A 2-TEP13B0.28-2.431.59-1.750.72-0.194.873.17-1.50-2.013.400.75-0.241.32-0.132-TE423A2-TE-423B 2-TE<33A2-TE-433B 0.94-0.58-0.090.34-0.430.820.21-0.03-0.19-0.49-0.12-0.15-4.43-3.973.433.12-1.100.07-0.17-0.63-0.820.03-0.31-0.670.01-0.36-0.11-0.250.24-0.420.50-0.212-TE-443A 0.90-0.050.66-3.12-0.81-0.390.36-0.352-TE-443B

-0.670.95-0.21-3.870.700.78-0.17-0.94350'F250'FRTD¹06/19/862-TE-413A 1.2502/28/89-2AO10/07/90-4.700.050.9806/08/9206/18/86-4.39-1.4502/28/8910/06/9006/06/921.642-TE-413B

-3.803.95-6.34-1.29-4.133.27-6.12-0.392-TE-423A 2-TE-423B 2-TE-433A 0.900.340.33-0.700.06-0.436.026.04-6.321.01-0.571.241.130.610.38-0.53-0.04-0.815.885.69-6.220.07-0.510.712-TE-433B1.20-1.12-6.73-1.341.15-1.23-6.55-0.482-TE-443A 2-TE-443B 0.54-0.78-0.280.926.095.94-1.140.420.880.61-0.441.225.875.86-0.26-0.77 fllt,I Attachment 1toAEP:NRC:1181 CPage15Table3CNarrowRangeRTDsExtrapolated Drift('FDeviation fromAverageRCSTemperature)

RTD¹2-TE-410A 527'F0.20-0.530.2803/05/8910/11/9006/08/9203/05/89-0.25450F10/09/9006/08/920.120.132-TE-4108 2-TE-411A 0.15-0.290.24-0.26-0.26-0.08-0.36-0.221.75-1.490.18-0.072-TE-4118

-0.520.480.010.47-1.681.202-TE-420A 2-TE-4208 2-TE-421A

-0.20-0.120.16-0.010.190.160.47-0.130.070.050.070.19-0.040.14-0.150.50-0.040.122-TE-4218-0.06-0.200.00-0.07-0.120.052-TE-430A

=2-TE-4308 2-TE-431A 0.06-0.26-0.290.310.120.07-0.16-0.12-0.28-0.130.09-0.270.20-0.090.08-0.180.33-0.262-TE-4318 0.08-0.230.130.00-0.100.162-TE-440A 2-TE-4408 2-TE-441A

-0.370.640.040.210.410.11-0.300.07-0.070.28-0.120.08-0.311.16-0.030.03-1.130.042-TE-4418

-0.440.59-0.120.37-1.761.07MaxDeviation MinDeviation Marginto+1.2'F0.560.890.310.64-0.52-0.530.47-0.280.730.47-0.360.73-1.76-0.55-1.490.001.751.20Marginto-1.2'F0.680.670.920.84-0.56-0.29RTD¹2-TE-410A 2-TE-4108 2-TE-411A 2-TE-4118 2-TE-420A 02/28/89-0.01-0.39-0.22-0.160.31350'F10/07/90-0.051.390.18-0.97-0.180.00-0.360.89-0.370.290.4306/08/9202/28/890.14-0.02-1.14-0.17-0.120.181.52-1.200.180.08-0.23-0.380.540.37250'F10/06/9006/06/922-TE-4208 0.10-0.010.030.26-0.120.092-TE<21A0.24-0.220.120.05'-0.250.212-TE-4218

-0.190.190.051.03-0.110.172-TE-430A 2-TE-4308 2-TE-431A 2-TE-43182-TE-440A 2-TE-4408 0.070.01-0.070.18-0.06-0.090.040.180.12-0.270.110.880.03-0.28-0.14-0.140.04-0.840.140.11-0.230.10-0.330.02-0.480.170.04-0.31-0.150.010.00-0.220.12-0.080.90-0.922-TE-441A 0.10-0.100.03-0.19-0.200.072-TE-4418MaxDeviation MinDeviation 0.170.31-0.39-1.121.39-1.120.70-0.160.891.03-1.14-0.370.69-0.710.691.52-0.71-1.20Marginto+1.2'FMarginto-1.2'F0.890.81-0.190.080.310.060.170.83-0.320.490.510.00 Attachment 1toAEP:NRC:1181 CPage16Table3DWideRangeRTDsExtrapolated Drift('FDeviation fromAverageRCSTemperature)

RTD¹2-TE-413A 527'F3.36-3.3403/05/8910/11/9006/08/9203/05/895.45-0.51450'F10/09/9006/08/923.770.752-TE-413B 2-TE-423A 0.33-1.372.71-0.644.41-5.57-0.040.280.14-4.971.130.302-TE<23B1.40-1.78-4.57-0.04-0.53-0.082-TE-433A 0.30-0.454.66-0.140.270.802-TE-433B

-0.37-0.164.30-0.040.570.052-TE-443A 2-TE-443B MaxDeviation

-0.950.971.62-1.582.713.360.08-4.815.450.42P.970.421.02-0.93-1.01-1.303.770.80MinDeviation

-3.34-'1.78-5.57-0.51-4.97-1.01Marginto+8.4'FMarginto-8.4F5.695.065.046.622.952.837.987.897.604.633.437.39RTD¹350'F02/28/8910/07/90250'F06/08/9202/28/8910/06/9006/06/922-TE-413A

-3.65-3.126.20-2.43-4.017.902-TE-413B 2-TE-423A 2-TE-423B

-1.60-0.289.138.127.75-13.986.59-6.24-7.09-1.66-0.428.?47.827.40-12.817.51-7.61-8.122-TE-433A

-0.76-8.007.50-1.82-7.389.082-TE-4338 2-TE-443A 2-TE-443B

-2.32-0.821.70-7.628.656.827.03-6.80-7.20-2.38-1.052.36-7.268.616.337.95-8.03-8.69MaxDeviation 7.759.137.507.408.749.08MinDeviation Marginto+8.4'FMarginto-8.4'F-3.65-13.980.65-0.734.75-5.58-7.200.901.201.005.97-0.34-4.41-2.43-12.81-8.69-0.68-0.29 Attachment 1toAEP:NRC:1181C Page17Discussion ofNLP-152andNLP-153Aril1992Surveillance DataDuringtheUnit21992refueling calibration, twopressurizer leveltransmitters, NLP-152andNLP-153,werefoundwithzeroshifts.NLP-152,theprotection setIItransmitter exhibited a+50%spanzeroshift,andNLP-153,theprotection setZZZtransmitter showedanapproximate

-20%spanzeroshift.Thereasonforthelargezeroshiftsonthetransmitters wasneverdetermined.

Thetransmitters werenotdamaged,andwerecalibrated tonominalvalues.Itispostulated thatonlyoneside'srootorinstrument valvesonthesensinglinestothetransmitter wereshut,orthatleak-byofarootvalvemayhaveallowedRCSpressureononesideoftheDPcell.Thisone-sided pressureeffect,whichcouldhavebeenaspikeorappliedoverweekspriortothecalibration ispostulated tohavecausedthelargezeroshifts.The"asfound"dataandcalculated shiftareshowninTables1Aand1B.This"asfound"datadoesnotreflectthelastoperational stateofthetransmitters.

Pastmeasureddriftdataindicates thesetransmitters normallydeviateI2%tof3%ofspanfromthe"asleft"valuesoverafuelcycle.Inaccordance withtechnical specifications, thechannelsarecomparedatthepanelindicator everyshift.Randomlyselectedshiftlysurveillance datatakenbyOperations revealsnogreaterthana1%deviation fromSeptember 1,1991,toFebruary18,1992,justbeforetheUnit2shutdown.

TheOperations shiftlydataisshownbelowforvariousdates.Date09/01/9111/01/9112/01/9101/01/9202/08/92.02/15/92 02/18/92Instr.NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153NLP-151NLP-152NLP-153Shift1st2nd3rd51't51't50%51%51%50%50%50%49%52't52't52%52%52%52%51't51%51't52%52%52't52't52%52't52%51%52't52%52%52't52%52%52%51't51%51%42%42%42't42%42%42't42%42%42%42%42%42't42%42't42%42%42%42%42%42%42%42%42%42%42%42%42%

Attachment 1toAEP:NRC:1181C Page18Thepanelindication isanisolatedcurrentloop.Theisolatorandtheindicator drifterrorswerecomparedoverthelastthree'cycles todiscerntherelativestability andmagnitude of.errors,associated withthesecomponents.

Theerrorsaresummedtoprovideworst-case valuesandareshownbelow.Alldriftvaluesin%Spanforthevalues25'4,50%,75%,75%,50%,25%arefromthepastcalibrations.

NLP-1519/88Calibration 8/90Calibration 4/92Calibration ScaleI/ILZSumLZSumLISum25%50%75%75't50%25%-0.100-0.075-0'50-0.050-0.075-0.100+0.050-0.025+0.1000.000-0.375-0.100-0.050-0.100+0.050-0.050-0.425-0.200-0.025-0.025-0.025.-0.025-0.025-0.0200.000-0.025-0.125-0.125-0.1250.000-0.025-0.050-0.150-0.150-0.150-0.025-0.375-0.425-0.450-0.450-0.425-0.3750.0000.000-0.400-0.4000.0000.000-0.375-0.425-0.850-0.850-0.425-0.375NLP-1529/88Calibration 8/90Calibration 4/92Calibration ScaleI/I25%+0.05050%+0.07575%+0.05075%+0'5050%+0.07525%+0.050LI0.0000.0000.0000.0000.0000.000Sum+0.050+0.075+0.050+0.050+0.075+0.050+0.0500.0000F0000.0000.000+0.050LZ+0.625+0.125-0.150-0.150+0.125+0.625Sum+0.675+0.125-0.150-0.150+0.125+0.675+0.075+0.050+0.050+0.050+0.050+0.075LI0.0000.0000.0000.0000.0000.000Sum+0.075+0.050+0.050+0050+0.050+0.075NLP-1539/88Calibration 8/90Calibration 4/92Calibration ScaleI/ZLZSumLZSumLISum25%+0.05050%+0.07575%+0.05075%+0.05050%+0.07525%+0.050-0.225-0.575-1.125-1.125-0.625-0.300-0.175-0.500-1.075-1.075-0.550-0.250+0.100+0.100+0.100+0.100+0.100+0.100-0.100-0.325-0.850-0.850-0.325-0.2500.000-0.225-0.750-0750-0.225-0.150-0.175-0.150-0.150-0.150-0.150-0.175+0.450+0.475-0.500-0.375+0.250+0.325+0.275+0.325~-0.650-0.525-0.400+0.150 Attachment 1toAEPsNRC:1181C Page19Comparing the"asfound"errordatabetweenthethreepanelindicators attheapproximate levelfornormaloperation, 50%,thegreatestdeviation was0.75%yhichwasbetweenNLP-151andNLP-153..

Theindicator errorforNLP-152wasvirtually zeroat+0.05%.Thus,theactualcalibration difference betweenthethreeleveltransmitters musthavebeenverysmall.Toverifythisstatement, arealistic scenariowasderivedtodetermine thetransmitter errorsassuming:

NLP-151=NLP-152=NLP-153=42%Atthetwo50%level(pressure appliedinanincreasing, thendecreaseing fashion)readings, theerrorsareasfollowss,NLP-151NLP-151NLP-152NLP-152NLP-153NLP-153transmitter errors:indicator errors:transmitter errors:indicator errors:transmitter errors:indicator errors:-0.900%-0.425%unknown+0.050%unknown+0.325%-1.250%-0.425%unknown+0.050%unknown-0.400%(fromTable1B)(fromabove)(fromabove)(fromabove)NLP-151totallooperrorstotheindicator:

>>1.325%-1.675%(transmitter

+indicator)

Thusthetransmitter errorsforNLP-152andNLP-153canbesolvedasfollows:NLP-152transmitter error=(NLP-151totalerror)>>(NLP-152indicator error)~-1.325%-(+0.050%)

=-1.375%,and-1.675%-(+0.050%)

~-1.725%NLP-153transmitter errorI(NLP-151totalerror)-(NLP-153indicator error)=-1.325%-(+0.325%)

=-1.650%,and-1'75't-(-0.400't)

~-1.275%.Therefore, itisreadilyapparentthatthemeasuretransmitter errorsof+50%onNLP-152and-20%onNLP-153arenotattributable todriftandthedatashouldbediscarded forthedriftanalysis.

Attachment 2toAEP:NRC:1181C UpdatetoAEP:NRC:1181 Reasonsand10CFR50.92Significant HazardsEvaluations forChangestotheTechnical Specifications forDonaldC.CookNuclearPl'antUnit2 Attachment 2toAEP:NRC:1181C Page1UPDATETOAEP:NRC:1181 Surveillance extension reestswhichmaberemovedfromAEP:NRC:1181 Theextension fortheintermediate rangedetectorcalibration andP-6interlock functional testing(Group11,T/Ss4'111,Table4'lgI'tern5and4'11')isnolongerneededsincethesurveillance wassatisfactorily completed duringtheforcedoutageonAugust10,1993.(ReplaceT/Spage3/43-11fromAEP:NRC:1181 submittal withnewproposedpage3/43-11.)Theextension forthereactorcoolantflowcalibration (Group15,T/Ss4.2.5.2and4.3.1.1.1, Table4.3-1,Items12613)isnotneededsincethetransmitters werecalibrated duringOctoberandNovember1992.Thefirsttransmitters calibration isdueAugust17,1994,aftertherequested extension date.Theremainder ofthechannelcanbecalibrated atpower.(ReplaceT/Spage3/43-11[sameasabove)anddeleteT/Spages3/42-15and3/43-12fromAEPsNRC:1181 submittal.

)Theextension forcontainment waterlevelcalibration (Group14,T/S4.3.3.6,Table4.3-10,Item18)isnolongerneeded.Ithasbeendetermined thatthiscalibration canbeperformed withoutentryintolowercontainment, therefore, wecanperformitpriortotherefueling outage.(ReplaceT/Spage3/43-47fromAEP:NRC:1181 submittal withnewproposedpage3/43-47.)Surveillance extension reestswhichneedaddedtoAEP:NRC:1181 Ithasrecentlybeendetermined thatthreeT/Ssurveillances wereomittedfromouroriginalsubmittal (AEP:NRC:1181 datedApril16,1993)concerning operation ofUnit2longerthancertainT/Ssurveillances allow.Thesurveillances whichneedintervalextensions maybeaddedtoexistinggroupsofT/SsassetforthinAEP:NRC:1181 asfollows:~GrauTSAffectedDescritionofChaneDueDate(4)4.3.2.1.1, Table4.3-2,Items8.a6S.bDelaycalibrations oftime02/05/94delayrelaysfor4Kvbuslimitinglossof/degraded voltageduedate(5)4)Table4.3-10,Item15Delaycalibrations ofincorethermocouples inmode304/28/94(14)4.4.6.1.b Delaycalibration ofcontainment flowmonitoring system04/03/94Theremainder ofthisattachment containsthereasonstheintervalextensions arebeingrequested,

)ustlfications fortheextensions, andthesignificant hazardsconsideration.

g~)f Attachment 2toAEP:NRC:1181C Page244KvLossofVoltaeandDeradedVoltaeTimeDelaRelasT/S4.3.2.1.1, Table4.3-2,Items8.aand.S.brequirethatthesetimedelayrelaysbecalibrated every18months.Thissurveillance shouldnotbeperformed atpowerbecausethecomponents involved(agastats) cannotbeisolatedfromtheirnormalpowersupply.Performance ofthesurveillance couldcauseapowertransferwhichwouldresultinachallenge tosafetyrelatedcomponents.

Also,sincethesurveillance wouldbeperformed on"live"equipment, personnel safetyisatrisk.Thisextension isneedfromFebruary5,1994,untiltheUnit2refueling outage.(ReplaceT/Spage3/43-32fromAEP:NRC:1181 submittal withnewproposedpage3/43-32.)Thetimedelayrelaysinvolvedinthissurveillance areelectronic andwereinstalled in1986.Electronic agastatsarehighlyreliable, accurateandrepeatable.

Thereliablity, accuracyandrepeatablity ofthetimedelayrelaysweredemonstrated duringthepreviousthreechannelcalibration surveillances wherenoadjustments wererequiredontheasfoundconditions.

Basedontheabove,thereisnoreasontobelievethatduringtheextension periodthesetimedelayrelayswouldnotperformtheirintendedsafetyfunctionasrequired.

10CFR50.92CriteriaPer10CFR50.92,aproposedamendment willnotinvolveasignificant hazardsconsideration iftheproposedamendment doesnot:(1)involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously

analyzed, (2)createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously analyzedorevaluated, or(3)involveasignificant reduction inamarginofsafety.Ourevaluation oftheproposedchangewithrespecttothesecriteriaisprovidedbelow.Criterion 1Ourlastthreesetsofsurveillance dataonthetimedelayrelaysshowthattheyareveryreliable, accurateandrepeatable.

Sincetheyareelectronic relays,thereisnoreasontobelievethattheywoulddriftoutsidetheiracceptable setpoints.

Thus,webelievethattheywouldperformtheirintendedfunction(s) duringtheextension period.Forthesereasons,webelievetheextension wearerequesting willnotresultinasignificant increaseintheprobability orconsequences ofapreviously evaluated

accident, norwillitresultinasignificant reduction inamarginofsafety.

Attachment 2toAEP:NRC:1181C Page3Criterion 2~Thisextension wi,llnotresultinachangeinplantconfiguration oroperation.

Therefore, theextension shouldnotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously evaluated oranalyzed.

Criterion 3SeeCriterion 1,above.Lastly,wenotethattheCommission hasprovidedguidanceconcerning

.thedetermination ofsignificant hazardsbyproviding certainexamples(48FR14870)ofamendments considered notlikelytoinvolvesignificant hazardsconsideration.

Thesixthoftheseexamplesreferstochangeswhichmayresultinsomeincreasetotheprobability orconsecpences ofapreviously evaluated

accident, buttheresultsofwhicharewithinlimitsestablished asacceptable.

Webelievethischangefallswithinthescopeofthisexample,forthereasonscitedabove.Thus,webelievethischangedoesnotinvolveasignificant hazardsconsideration asdefinedin10CFR50.92.

$~'I Attachment 2toAEP:NRC:1181C Page45IncoreThermocou lesCoreExitThermocou lesT/S4.3.3.6,Table4.3-10,Item15requiresthatachannelcalibration beperformed every18months.Footnote(1)tothisT/Srequiresthatapartialrangechannelcalibration forthesensorbeperformed belowP-12inmode3.Thissurveillance cannotbeperformed duringreactoroperation sinceitrequirestheunittobeinmode3.Thisextension isneededfromApril28,1994,untiltheUnit2refueling outage.(ReplaceT/Spage3/43-47fromAEP:NRC:1181 submittal withnewproposedpage3/43-47.Samepagereplacement astheoneremovingtheextension requestforcontainment waterlevelsurveillance.)

T/S3'.3.6,Post-Accident Instrumentation, requiresaminimumof2coreexitthermocouples percorequadrant.

Datafrom58incorethermocouples, whicharedistributed throughout thecoreinvariouscorelocations (13inQuadrantI,16inQuadrantII,17inQuadrantIIIand12inQuadrantIV),werereviewedforthisanalysis.

Duringreactoroperation thecoreexitthermocouples arerequiredtobechannelcheckedonamonthlybases.Weadministratively performthechannelcheckweekly.Thissurveillance confirmsthatcoreexitthermocouples havenotchangedsignificantly fromtheaveragereadingandverifiesT/Scompliance.

Ifasignificant changeisnotedtheassociated thermocouple isdeclaredinoperable.

Thissurveillance wouldcontinuetobeperformed duringtheextension periodandifnecessary, appropriate T/Sactionstakenbasedontheresultsofthesurveillance.

Areviewhasbeenperformed onthiscycle'sandtheprevioustwocycle'scoreexitthermocouple data.Thepurposeofthereviewwastodetermine ifasignificant driftcharacteristic wasinherenttothecoreexittherocouples whichcouldleadtoseveralcoreexitthermocouples becominginoperable priortothescheduled refueling outage.Essentialy, nothermocouple driftwasobserved, thusweexpectthatcompliance withT/S3.3.3.6(2thermocouples/core quadrant) willbeassuredthroughout therestofthescheduled cycleoperation.

Basedontheabove,webelieveextension ofthecoreexitthermocouple channelcalibration willnotadversely impacttheabilityofthisequipment toperformitssafetyfunction.

10CFR50.92CriteriaPer10CFR50.92,aproposedamendment willnotinvolveasignificant hazardsconsideration iftheproposedamendment doesnot:(1)involveasignificant increaseintheprobability orconsequences ofanaccidentpreviously

analyzed, (2)createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously analyzedorevaluated, or(3)involveasignificant reduction inamarginofsafety.

4Vl~~

Attachment 2toAEP:NRC:1181C Page5Ourevaluation oftheproposedchangewithrespecttothesecriteriaisprovidedbelow.Criterion 1Reviewofourlastthreecycle'ssurveillance dataindicated thatdriftofthethermocouples isnotextpected.

Also,weadministratively performtheT/Srequiredmonthlychannelcheckonaweeklybasis.Thischannelcheckwouldprovideadequateindication ifasignificant numberofthermocouples neededtobedeclaredinoperable, thusallowingustotakethecorrective actionsnecessary toensureT/Scompliance.

Therefore, webelievethattheincorethermocouples willbecapableofperforming theirintendedfunctionduringtheextension period.Forthesereasons,webelievetheextension wearerequesting willnotresultinasignificant increaseintheprobability orconsequences ofapreviously evaluated

accident, norwillitresultinasignificant reduction inamarginofsafety.Criterion 2Thisextension willnotresultinachangeinplantconfiguration oroperation.

Therefore, theextension shouldnotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously evaluated oranalyzed.

Criterion 3SeeCriterion 1,above.Lastly,wenotethattheCommission hasprovidedguidanceconcerning thedetermination ofsignificant hazardsbyproviding certainexamples(48FR14870)ofamendments considered notlikelytoinvolvesignificant hazardsconsideration.

Thesixthoftheseexamplesreferstochangeswhichmayresultinsomeincreasetotheprobability orconsequences ofapreviously evaluated

accident, buttheresultsofwhicharewithinlimitsestablished asacceptable.

Webelievethischangefallswithinthescopeofthisexample,forthereasonscitedabove.Thus,webelievethischangedoesnotinvolveasignificant hazardsconsideration asdefinedin10CFR50.92.

I Attachment 2toAEP:NRC:1181C Page614Containment FlowMonitorin Sstem'/S4.4.6.1.b requiresthatthecontainment sumpflowmonitoring systembecalibrated every18months.Thissurveillance cannotbeperformed duringreactoroperation sinceitrequiresentryintothelowervolumeofcontainment.

Thisextension isneededfromApril3,1994,untiltheUnit2refueling outage.(AddnewproposedT/Spage3/44-14toAEP:NRC:1181 submittal.)

Thecontainment flowmonitoring systemisusedtomonitoranddetectRCSleakage.Byknowingthesumppumpcapacities (flowrates)andhowlongapumpruns,theleakageratecanbemonitored andestimated.

Thepasttwosurveillances showthatthemeasuredpumpflowrateshavebeenwellabovetheiracceptance criteriaasdisplayed below:~PumFlowRate(GPM)Acceptance 1992Surveillance 1990Surveillance CriteriaReactorCavity2-PP-0593A56.2153.722ReactorCavity2-PP-0593B50.9848.722LowerContainment 2-PP-0382A140.75167.3>45LowerContainment 2-PP-0382B166.21164.0>45PipeTunnel2-PP-0612A56.3653.2>45PipeTunnel2-PP-0612B57.2243.657.3(retest)>45Theretestonthepipetunnelpump(2-PP-061 2B)wassuccessful following removalofforiegnmaterialwhichenteredthesumpandpumpinletstrainers duringtheoutage.Zfapumpweretodegrade,theflowratewoulddecreaseg thusincreasing theruntimeforthepumptodeliveragivenamountofwater.Thiswouldleadtoanoverestimation ofRCSleakage,whichisconservative inrespecttotheT/Ss.Thepipetunnelsumppumptypically runsaminuteperday,andthereactorcavityandlowercontainment pumpsrunlessfrequently.

Basedontheexcellent surveillance historyofthepumpsandtheminimalamountofruntimeaccumulated onthepumps,thereisnoreasontobelievethatcontinued operation duringtheextension periodwouldcausethepumpstobecomeinoperable.

I'I'IJ C~~i+'Attachment 2toAEP:NRC:1181C Page710CFR50.92CriteriaPer10CFR50.92,aproposed.

amendment willnotinvolveasignificant hazardsconsideration iftheproposedamendment doesnot:(1)involveasignificant increaseintheprobability orconsequences ofanaccident, previously

analyzed, (2)createthepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously analyzedorevaluated, or(3)involveasignificant reduction inamarginofsafety.Ourevaluation oftheproposedchangewithrespecttothesecriteriaisprovidedbelow.Criterion 1Ourpastsurveillance historyonthecontainment flowmonitoring systemhasshownthepumpstohavecapacities wellaboveouracceptance criteria.

Duringthecurrentcycle,thereactorcavity,lowercontainment, andpipetunnelsumppumpshaverunforaminimalamountoftime.Thus,thepotential forpumpdegradation issmall.Therefore, thereisnoreasontobelievethatthecontainment flowmonitoring systemwouldnotperformitsintendedfunctionduringtheextension period.Forthesereasons,webelievetheextension wearerequesting willnotresultinasignificant increaseintheprobability orconsequences ofapreviously evaluated

accident, norwillitresultinasignificant reduction inamarginofsafety.Criterion 2Thisextension willnotresultinachangeinplantconfiguration oroperation.

Therefore, theextension shouldnotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously evaluated oranalyzed.

ICriterion 3SeeCriterion 1,above.Lastly,wenotethattheCommission hasprovidedguidanceconcerning thedetermination ofsignificant hazardsbyproviding certainexamples(48FR14870)ofamendments considered notlikelytoinvolvesignificant hazardsconsideration.

Thesixthoftheseexamplesreferstochangeswhichmayresultinsomeincreasetotheprobability orconsequences ofapreviously evaluated

accident, buttheresultsofwhicharewithinlimitsestablished asacceptable.

Webelievethischangefallswithinthescopeofthisexample,forthereasonscitedabove'.Thus,webelievethischangedoesnotinvolveasignificant hazardsconsideration asdefinedin10CFR50.92.

Attachment 3toAEP:NRC:1181C ExistingTechni.cal Specifications forDonaldC.CookNuclearPlantUnit2MarkedtoReflecttheProposedChanges