ML17334B286
| ML17334B286 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/30/1988 |
| From: | ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | MURLEY T E NRC, NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML17334B287 | List: |
| References | |
| AEP:NRC:1067A, NUDOCS 8901120447 | |
| Download: ML17334B286 (11) | |
Text
ACCELERATEDDIK+BUTIONDEMONSTR+OAISYFI'EM~~REGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR-8901120447DOC.DATE:88/12/30'OTARIZED:NODOCKETFACIL:50-315DonaldC.CookNuclearPowerPlant,Unit1,Indiana&05000315AUTH.NAMEAUTHORAFFILIATIONALEXICH,M.P.IndianaMichiganPowerCo.(formerlyIndiana&MichiganEleRECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControlDesk)
SUBJECT:
ApplicationforamendtoLicenseDPR-58,modifyingTechSpec4.1.1.5remintempforcriticality.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTRJENCLQSIZE:7~TITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-1LASTANG,JINTERNAL:ARM/DAF/LFMBNRR/DEST/CEB8HNRR/DEST/MTB9HNRR/DEST/SICBNRR/PMAS/ILRB12OGC/HDS1RES/DSIR/EIBEXTERNAL:LPDRNSICCOPIESLTTRENCL1011101.11111111011111.1RECIPIENTIDCODE/NAMEPD3-1PDNRR/DEST/ADS7ENRR/DEST/ESB8DNRR/DEST/RSB8ENRR/DOEA/TSB11NUDOC-BSTRACTGFg01NRCPDRCOPIESLTTRENCL2211111111111111NOTE'roALL"RIDS"RECIPXZmS.(/dcgg/<~~2.9(~g~hDSPZZASEHELPUSK)REDUCEWIPE!CGHIACZ'%HEDOCUMEÃZCONTROLDESKiROOMP1-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRZKITIONLISTSFORDOCGKBTZSYOUDGNiTNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR20ENCL17 IndianaMichiganPowerCompanyP.O.Box16631Columbus,OH43216IMEHANllNlCMGANROMEOAEP:NRC:1067A10CFR50.90DonaldC.CookNuclearPlantUnit1DocketNo.50-315llLicenseNo.DPR-58SUPPLEMENTALTECHNICALSPECIFICATIONCHANGESFORREDUCEDTEMPERATUREANDPRESSUREPROGRAMU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.E.MurleyDecember30,1988
DearDr.Hurley:
ThisletteranditsattachmentsconstituteanapplicationforamendmenttotheTechnicalSpecifications(T/Ss)fortheDonaldC.CookNuclearPlantUnit1.Specifically,weareproposingtomodifyT/S4.1.1.5(MinimumTemperatureforCriticality)suchthatthetemperaturebelowwhichthereactorcoolantsystemaveragetemperaturemustbemonitoredevery30minutesisreducedfrom551Fto545F.ThechangeisdesiredsinceweplantooperatetheupcomingUnit1Cycle11atreducedtemperatureandpressure(RTP)conditions.TheRTPprogramsupportsarangeofnominalfullpowerTavgfrom547Fto567.8F.TheexpectedfullpowerTavgforCyclellis0approximately550F,reducedfromthepresent(non-RTP)fullpower0Tavgof567.8F.PlantoperationwiththepresentT/SisnotprecludedundertheRTPconditions;however,theT/SdoesplaceaburdenontheplantoperatorssinceTavgwillhavetobemonitoredevery30minutesatessentiallyalltimeswhenthereactoriscritical.ThislettersupplementsourletterAEP:NRC:1067,datedOctober14,1988.ThatlettertransmittedtheanalysesthatsupportRTPoperation,aswellastheT/Schangesnecessarytoallowplantoperation.WerequestthatyourreviewofthisrequestbecompletedbyApril15,1989,whichisthesamedaterequestedinAEP:NRC:1067forapprovaloftheRTPanalysesandassociatedT/Schanges.pic'lpDRADQCK05OOoP'g,eel:4i~~Ios%~
Dr.T.E.Hurley-2-AEP:NRC:1067AAdditionaldetailsaboutthechangeandourevaluationconcerningsignificanthazardsconsiderationarecontainedinAttachment1tothisletter.TheproposedrevisedT/SchangeisfoundinAttachment2.Webelievethattheproposedchangeswillnotresultin(1)asignificantchangeinthetypesofeffluentsorasignificantincreaseintheamountsofanyeffluentthat,maybereleasedoffsite,or(2)asignificantincreaseinindividualorcumulativeoccupationalradiationexposure.TheseproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommittee,andwillbereviewedbytheNuclearSafetyandDesignReviewCommitteeattheirnextregularlyscheduledmeeting.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.R.C.CallenoftheMichiganPublicServiceCommission,andMr.GeorgeBruchmannoftheMichiganDepartmentofPublicHealth.Pursuanttotherequirementsof10CFR170'2(c),wehaveenclosedanapplicationfeeof$150.00fortheproposedamendments.ThisdocumenthasbeenpreparedfollowingCorporateproceduresthatincorporateareasonablesetofcontrolstoensureitsaccuracyandcompletenesspriortosignaturebytheundersigned.Sincerely,M.P.AlexichVicePresidentMPA/ehAttachmentscc:D.H.Williams,Jr.W.G.Smith,Jr.-BridgmanR.C.'allenG.CharnoffG.BruchmannA.B.Davis-RegionIIINRCResidentInspector-Bridgman ATTACHMENT1TOAEP:NRC:1067ADESCRIPTIONAND10CFR50.92SIGNIFICANTHAZARDSEVALUATIONFORCHANGESTOTHETECHNICALSPECIFICATIONSFORTHEDONALDC.COOKNUCLEARPLANTUNIT1
ATTACHMENT1TOAEP:NRC:1067APage1DescritionofChaneUnit1TechnicalSpecification(T/S)4.1.1.5.b(MinimumTemperatureforCriticality)aspresentlywrittenrequiresverificationthatthereactorcoolantsystemTavgis>541Fatleastonceper30minuteswhenthereactoriscriticalandTavgislessthan551F.WeareproposingtorevisetherequirementsuchthatTavgmustbeverifiedevery30minuteswhenTavgisbelow/(545ForwhenthelowTavgalarmisinoperable.0ReasonfortheChaneUnderpresentoperatingconditions,fullpowerTavgis567.8F.0FortheupcomingUnit1Cycle11,however,weareplanningtooperatetheplantunderreducedtemperatureandpressure(RTP)conditions.TheRTPprogramsupportsarangeofnominalfullpowerTavgfrom547Fto567.8F.ThefullpowerTavgwillbeloweredtoapproximately550FforUnit1Cyclell.Sincethis0isbelow551F,thepresentwordingofT/S4.1.1.5.bwouldrequirethatTavgbeverifiedtobeabove541F(theminimumtemperature0forcriticality)every30minutesessentiallyalltimeswhenthereactoriscritical.AlthoughthisdoesnotprecludeoperationunderRTPconditions,itisburdensomeandwilldistracttheoperatorsfromotherduties.ThisrequestsupplementsourletterAEP:NRC:1067,datedOctober14,1988.Thatlettertransmitted.theanalyseswhichsupportRTPoperation,aswellastheT/SchangesthatarenecessaryinordertoimplementtheRTPprogram.JustificationforChaneTheproposedchangedoesnotaltertheminimumtemperatureforcriticality.Tavgmustbemaintainedabove541Fanytimethereactoriscritical.ShouldTavgdropbelow541F,theactionstatementforT/S3.1.1.5requiresthatTavgberestoredabove0541Fwithin15minutesortheunitmustbeplacedinhotstandby.T/S4.1.1,5.bpresentlyrequiresTavgtobedeterminedevery30minuteswhenTavgislessthan10Fabove541F.This10FvalueisconsistentwiththelatestrevisionofWestinghouseStandardT/Ss.Westinghousehasinformedusthe10Fwasestablishedtoprotectagainstencroachmentuponthe541Fminimumtemperature0forcriticality.The10Fvalueisnotderivedfromanyanalysis.0TheplantisequippedwithalowTavgalarmthatiscurrentlyset0at554F.ThelowTavgalarmisderivedfromthebistablesthatclosethemainfeedwatercontrolvalvesonlowTavgcoincidentwithareactortrip.Thisfunctionhelpsprotectthereactorfromexcessivecooldownfollowingareactortrip.Diversityofsignals
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ATTACHMENT1TOAEP'NRC'1067APage2forterminatingmainfeedwaterisprovidedviatheP-4permissive,whichtripsthemainfeedwaterpumpsintheeventofareactortrip.ThefunctionsassociatedwiththelowTavgbistableandthemainfeedwaterpumptriponreactortriparenotdelineatedintheT/Ss.WeareproposingtolowerthelowTavgsetpoint(includingthealarm)from554Fto545F.Thetemperatureof545Fis00sufficientlybelowtheoperatingtemperaturetolessenthepossibilityofunnecessary.=alarms,butishighenoughtoprovidetheoperatorwithamplewarningthatTavgisapproachingthe541F0minimumtemperatureforcriticality.LoweringthelowTavgsetpointhasminimaleffectontheresponseoftheplanttoreactortripbecause,asdiscussedabove,themainfeedpumps(MFP)aretrippeddirectlyonareactortrip,viatheP-4permissive.TheFSARLOCAandtransientanalysesdonottakecreditforfeedwaterisolationderivedfromthe'lowTavgbistable.ThefunctionismodeledintheWestinghouseOwnersGroupanalysisofsteamlinebreakmassandenergyreleasesoutsidecontainment(WCAP10961),becauseitisconservativetodoso.Modelingofthefunctionisconservativebecauseitleadstoearlierfeedwaterisolationthantheother(T/S)signalsthatalsoprovidefeedwaterisolation.Earlyterminationoffeedwaterresultsingreatersteamgeneratortubeuncovery,andthusmoresuperheatingofthesteamexitingthebreak.LoweringthelowTavgsetpointisconservativewithrespecttothisanalysis,sinceitwillsomewhatdelaythefeedwaterisolation.WeproposethattheoperatoronlyberequiredtomonitoranddocumentTavgona30-minutebasisifTavgisbelowtheproposedlowTavgsetpointof545F,orifthelowTavgalarmis0inoperable.ThiswillavoidtheburdenthatmonitoringTavgevery30minutesplacesontheoperators,andwillhelpensuretheoperators'ttentionisnotdivertedfrommoreimportantsafetyfunctions.Tavgwillcontinuetobemeasuredatleastonceper12hoursinMode1,asrequiredbyT/S3.2.5(DNBParameters).TheresettingoftheTavgalarmto545FwillensuretheoperatoriswarnedthatTavgisencroachinguponthe541Fminimumtemperature0forcriticality.10CFR50.92EvaluationPer10CFR50.92,aproposedamendmentwillnotinvolveasignificanthazardsconsiderationiftheproposedamendmentdoesnot:
ATTACHMENT1TOAEP:NRC:1067APage31)Involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyanalyzed,2)Createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyanalyzedorevaluated,or3)Involveasignificantreductioninamarginofsafety.Criterion1TheperiodicmonitoringanddocumentingofTavgwhentheplantisoperatedneartheminimumtemperatureforcriticalitywillbereduced.However,thischangewillbecompensatedforbyloweringthealarmsetpointtowarntheoperatorofapproachtotheminimumtemperatureforcriticality.Therefore,wedonotbelieveourproposalwillresultinanincreaseintheprobabilityorconsequencesofanaccidentpreviouslyanalyzed.Criterion2TheproposedT/Schangesdonotrevisetheminimumtemperatureforcriticalityof541FspecifiedinT/S3.1.1.5.ThechangeonlyimpactsthetemperatureatwhichTavgmustbemonitoredevery30minutes.Thiswillbecompensatedforbyprovidinganalarmata0Tavgof545Fthatwillwarntheoperatorthattheplantisapproachingtheminimumtemperatureatwhichitmayremaincritical.Thus,wedonotbelievethechangecanresultinanynewordifferentkindsofaccidentsfromanypreviouslyanalyzedorevaluated.Criterion3ThepurposeoftheT/SistoensurethereactorisnotcriticalwithTavgbelow541F,withoutappropriateactionbeingtaken.WewillensurethattheoperatoriswarnedthatTavgisapproachingthe541FlimitbyloweringthelowTavgalarmsetpointto545F.Webelievethiswillprovideadequateassurancethatthe541FTavglimitisprotected.Therefore,theproposedchangeshouldnotsignificantlyreducethemarginofsafety.Lastly,wenotethattheCommissionhasprovidedguidanceconcerningthedeterminationofsignificanthazardsbyprovidingexamples(48FR14870)ofamendmentsconsiderednotlikelytoinvolvesignificanthazardsconsideration.Thesixthoftheseexamplesreferstochangesthatmayresultinsome*increasetotheprobabilityorconsequencesofapreviouslyanalyzedaccident,buttheresultsofwhicharewithinlimitsestablishedasacceptable.Asdiscussedinthebases,theminimumtemperatureforcriticalityensuresthatthereactor,instrumentation,andvesselareoperatedintheiranalyzedtemperatureranges.Theserequirementsarenot IC ATTACHMENT1TOAEP:NRC:1067APage4affectedbyourproposedrevisiontothesurveillancerequirements.ThechangeonlyimpactsthetemperatureatwhichtheoperatormustmonitorTavgevery30minutestoensurethetemperaturedoesnotdropbelowtheminimumtemperatureforcriticality.MewillbeprovidinganalarmthatwillalerttheoperatorthatthetemperatureisapproachingitsminimumTavglimit.Therefore,webelievetheexamplecitedisapplicableandthatthechangesshouldnotinvolveasignificanthazardsconsideration.