ML17328A246
| ML17328A246 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/27/1989 |
| From: | ALEXICH M P INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | MURLEY T E NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML17328A247 | List: |
| References | |
| AEP:NRC:0930, AEP:NRC:930, NUDOCS 9001050235 | |
| Download: ML17328A246 (20) | |
Text
ACCELERATEDDlRIBUTIONDEMONTIONSYSTEMREGULATORYINFORMATIONDISTRXBUTXONSYSTEM(RIDS)ACCESSIONNBR:9001050235DOC.DATE:89/12/27NOTARIZED:NODOCKETFACIL:50-315DonaldC.CookNuclearPowerPlant,Unit1,Indiana&0500031550-316DonaldC.CookNuclearPowerPlant,Unit2,Indiana&05000316AUTH.NAMEAUTHORAFFILIATIONALEXICH,M.P.XndianaMichiganPowerCo.(formerlyIndiana&MichiganEleRECIP.NAMERECIPIENTAFFILIATIONRMURLEY,T.E.OfficeofNuclearReactorRegulation,Director(Post870411"
SUBJECT:
ApplicationforamendstoLicensesDPR-58&DPR-74,extends.ngdurationofoperatinglicensesto40years.kDISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTRENCLSIZE:l'JlTITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-1LAGIITTER,J.INTERNAL:NRR/DET/ECMB9HNRR/DST8E2NRR/DST/SICB7ENUDOCS-ABSTRACTOGC/HDS1RES/DSIR/EIBEXTERNAL:LPDRNSICCOPIESLTTRENCL11551111111110111111RECIPIENTIDCODE/NAMEPD3-1PDNRR/DOEA/OTSB11NRR/DST/SELB8DNRR/DST/SRXB8EOC/~BEGFILE0NRCPDRCOPIESLTTRENCL11111101111DDSS'OTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASIZlCONTACTTHE,DOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISIRIBUTIONLISISFORDOCUMENTSYOUDON'TNEEDlTOTALNUMBEROFCOPIESREQUIRED:LTTR21ENCL19i i*P~L44~l'IIapfJl indianaMichiganPowerCompanyP.O.Box16631Cofumbus,OH43216IAEP;NRC:0930DonaldC.CookNuclearPlantUnits1and2DocketNos.50-315and50-316LicenseNos.DPR-58andDPR-74PROPOSEDLICENSEAMENDMENT-40-YEARLIFEU.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Attn:T.E.MurleyDecember27,1989
DearDr.Murley:
ThisletteranditsattachmentsconstituteanapplicationforamendmenttotheFacilityOperatingLicensesfortheDonaldC.CookNuclearPlantUnits1and2.Specifically,weareproposingtoextendthedurationoftheoperatinglicensesto40yearsfromthedateofissuanceofthefull-powerlicenses.TheCookNuclearPlantunitsarecurrentlylicensedforoperationfor40yearscommencingwithissuanceoftheconstructionpermitandexpiringonMarch25,2009.However,alicensetermof40yearsfromthedateofissuanceofthefullpoweroperatinglicenseispermittedunder10CFR50.51.ThisamendmentapplicationrequeststheexpirationdateoftheFacilityOperatingLicenseforDonaldC,CookNuclearPlantUnit1tobechangedtoOctober25,2014,andforUnit2toDecember25,2017.Attachment1tothislettercontainsthereasonsforthechangesandouranalysesconcerningsignificanthazardsconsideration.Attachment2containstheproposedrevisedlicensepageforbothunits.Webelievethattheproposedchangeswillnotresultin(1)asignificantchangeinthetypesofeffluentsorasignificantincreaseintheamountsofanyeffluentthatmaybereleasedoffsite,or(2)asignificantincreaseinindividualorcumulativeoccupationalradiationexposure.TheseproposedchangeshavebeenreviewedbythePlantNuclearSafetyReviewCommitteeandbytheNuclearSafetyandDesignReviewCommittee.Incompliancewiththerequirementsof10CFR50.91(b)(1),copiesofthisletteranditsattachmentshavebeentransmittedtoMr.R.C.CallenoftheMichiganPublicServiceCommissionandNFEMSectionChiefoftheMichiganDepartmentofPublicHealth.9001050235S9'l227PDRADOCK0500031PPDCool CI Dr.T.E.Murley-2-AEP'NRC:0930ThisletterhasbeenpreparedfollovingCorporateproceduresthatincorporateareasonablesetofcontrolstoensureitsaccuracyandcompletenesspriortosignaturebytheundersigned.Sincerely,IM.P.AlichVicePresidentldpAttachmentscc:D.H.Williams,Jr.A.A.Blind-BridgmanR.C.CallenG.CharnoffA.B.Davis-RegionIIINRCResidentInspector-BridgmanNFEMSectionChief ATTACHMENT1TOAEP'NRC:0930REASONSAND10CFR50.92ANALYSESFORCHANGESTOTHEDONALDC.COOKNUCLEARPLANTUNITS1AND2FACILITYOPERATINGLICENSES TABLEOFCONTENTS~Pae1.0DescriptionoftheProposedChange2.0JustificationofChange3.0EnvironmentalandRadiologicalImpactsoftheProposedChange3.1RadiologicalImpactonMan3.2EnvironmentalImpactofPostulatedAccidents3'.OccupationalExposure3.4Low-LevelRadioactiveWaste3.5SpentFuel3.6'AquaticIssues4.0ElectricalEquipmentAssessment5.0ReactorVesselMaterialAnalysis6.0SteamGeneratorRepair7.0EconomicAssessment8.0BenefitstoStateandLocalEconomy9.0SignificantHazardsConsiderations Attachment1toAEP:NRC:0930Page11.0DescritionofProosedAmendmentCurrently,theDonaldC.CookNuclearPlantunitsarelicensedtooperatefor40yearsfromthedateofissuanceoftheconstructionpermitonMarch25,1969.ThelicenseswillexpireonMarch25,2009,Thepurposeofthissubmittalistorequesta40-yearoperatingtermfromthedateofissuanceofthefullpowerlicenses,i.e.,October25,1974forUnit1andDecember25,1977forUnit2.Thenewproposeddatesare40yearsfromtheabovedates,i,e.,October25,2014andDecember25,2017,respectively.2.0JustificationofChaneCurrentlythedurationofallnuclearpowerreactorlicensesisrestrictedto40years.Section103.CoftheAtomicEnergyActspecifiesthatalicenseistobeissuedforaperiodnotexceeding40years.Inaddition,10CFR50.51statesthateachlicensewillbeissuedforafixedperiodoftimenottoexceed40yearsfromthedateofissuance.Priorto1982,theCommissiongrantedoperatinglicenses(OL)withthedateofexpirationlinkedtotheissuancedateoftheconstructionpermit.However,thispracticewasmodifiedwhenCommonwealthEdisonCompanywasgrantedanOLforLaSalleUnit1forafulltermof40yearscommencingwiththeissuanceofthefull-powerlicense.TheCommissionextendeditsnewpracticeofgranting40-yearOLstoplantslicensedpriorto1982byissuingBaltimoreGasandElectricCompanylicenseamendmentswhichchangedtheOLexpirationdatesofCalvertCliffsUnits1and2toextendthedurationofbothlicensesto40yearsfromthedateofissuanceoftheOL.SincetheCommissiongrantedtheCalvertCliffsamendmentsonMay1,1985,similaramendmentshavebeengrantedtoPointBeach1and2,IndianPoint2,Oconee1,2and3,CrystalRiver3,Hatch1and2,St.Lucie1,Farley1and2,Surry1and2,NorthAnna1and2,HaddamNeck,Millstone1,FitzPatrick,YankeeRowe,Kewaunee,BeaverValley1,BrownsFerry1,2and3,McGuire1and2,PrairieIsland1and2,~Sequoyah1and2.TheoperqtinglicensesfortheDonaldC.CookNuclearPlantUnits1and2aresimilartothoseoftheseplantsinthattheywereallissuedpriorto1982andtheirlicensed40-yearlifetimeoriginallystartedfromthedateofissuanceoftheirconstructionpermits.ThisamendmentrequestistomodifythelicensesoftheCookNuclearPlantinthesamemannerthatwasgrantedtotheseunits'icenses.Thatis,toextendthedurationofthelicensesto40yearsstartingfromthedateofissuanceofthefullpowerlicenses.Thecurrentlicensesrepresentanoperatinglicensetermof34years,5monthsforUnit1and31years,3monthsforUnit2.
I Attachment1toAEP:NRC:0930Page23.0EnvironmentalImactsoftheProosedAmendmentTheAtomicEnergyCommission(AEC)staffpreparedandissuedtheFinalEnvironmentalStatement(FES)datedAugust1973fortheCookNuclearPlant.Priortoitsissuance,theAECstaffconsideredthefollowing:afinalcost-benefitanalysiswhichconsideredandbalancedtheenvironmentaleffectsofthefacilityandthealternativesavailableforreducingoravoidingadverseenvironmentaleffects,aswellastheenvironmental,economic,technical,andotherbenefitsofthefacility.TheFES'sconclusionafterweighingthebenefitsagainstenvironmentalcosts,andconsideringavailablealternatives,calledfortheissuanceofCookNuclearPlant'sproposedlicense.WehavereviewedtheFESandhaveconcludedthattheimpactonmanandtheenvironmentassociatedwithrecapturingtheconstructionyearsintheoperatinglicensesarenotsignificant,andhavebeenanalyzedsincetheFESassumeda30to40-yearoperationallife.Therearenoplanstobuildma]ornewstructuresonthesitewhichwouldbevisiblefromimmediatelyad]acentland.NewbuildingshavebeenerectedontheCookNuclearPlantsitesinceitwasoriginallybuilt.Themostsignificantareasfollows:trainingcenter,newsewageplant,twoofficebuildingextensions,threepolebarns,steamgeneratorstoragefacility,newsecurityaccessbuilding,andaradwastehandlingbuilding.Thesiteboundaryhasnotbeenchangedsincethelicenseswereoriginallygranted.NoplantmodificationshavebeenmadewhichwouldaffecttheconclusionsoftheenvironmentalreportorFES,suchasmodificationstotheintakeanddischargestructures.AppendixBofCookNuclearPlant'sTechnicalSpecificationsstates:"Beforeengaginginunauthorizedconstructionoroperationalactivitieswhichmayaffecttheenvironment,thelicenseeshallprepareandrecordanenvironmentalevaluationofsuchactivity.Whentheevaluationindicatesthatsuchactivityinvolvesanunreviewedenvironmentalquestion,thelicenseeshallprovideawrittenevaluationofsuchactivitiesandobtqinpriorapprovalfromtheNRC.WhensuchactivityinvolvesachangeintheEnvironmentalProtectionPlan,suchactivityandchangetotheEnvironmentalProtectionPlanmaybeimplementedonlyinaccordancewithanappropriatelicenseamendmentassetforthinSection5.3."Inaddition,weissuetheSemi-AnnualRadioactiveEffluentReleaseReportfortheNRC'sreview,whichdiscussestheradioactivedischarges,andtheAnnualEnvironmentalOperatingReport,whichdetailstheresultsandfindingsofongoingenvironmental,radiologicalandnon-radiologicalsurveillanceprograms.
Attachment1toAEP:NRC:0930Page3WhitethefollowingsectionsoftheFESareforthemostpartaccurate,afewminordiscrepanciesexist.V.D.RadiologicalImpactonManVI.EnvironmentalImpactofPostulatedAccidentsThesetopicsareaddressedinSections3.1and3.2ofthissubmittal.3.1RadioloicalImactonManAcomparativereviewwasperformedoftheFES'sgaseousandliquidradioactiveeffluentreleaseprojectionswiththatoftheactualoperatingreleases.TheactualgaseousaveragereleaseswereaboutsevenpercentofwhatwasprojectedintheFESreport.TheactualliquidaveragereleaseswerefoundtobeapproximatelyninepercentoftheprojectedannualreleaseswhichwereestimatedintheFES,exceptfortritium.Tritiumaverageeffluentreleaseswerefoundtobeabout46percenthigherthanwhatwasprojectedintheFES.However,itmustbenotedthattritiumisalowenergybetaradionuclidethatwouldcontributeverylittletotheoveralldoseconsequencetothegeneralpublic,andtheliquidtritiumannualrelease(averageoverthelastthreeyears)wasfoundtobelessthanonepercentoftheregulatoryrequirement(10CFR20).Acomparisonoftheprojectedannualmaximumindividualdosetothedosecalculatedfromactualreleaseswasmade,Itwasdeterminedthatthecalculatedindividualdose,basedonactualplantgaseouseffluentsaveragedoverthelastthreeyears,wasonlyabout16percentoftheprojectedgaseousdose.However,theactualcalculatedannualdosetoindividualsresultingfromliquideffluentsweregreaterthanwhathadbeenprojected(i.e.,0.6mRemvs.0.006mRem).Nevertheless,themaximumindividualdoseresultingfromallplanteffluents(gaseousandliquidcombined)isstillonlyabout2.3percentofwhatisallowedbyourTechnicalSpecifications.3.2EnvironmentalImactofPostulatedAccidentsAstud/wasconductedcomparingtheprojectedpopulationreflectedintheFgSfor1980withthe1980census.Theactualpopulationasof1980was17'tgreaterthanthe1980populationprojectedintheFES.Thefollowingisthecurrentpopulationestimatefortheyears2009and2015.Thisestimatewasbasedonthe1970and1980census.
Attachment1toAEP:NRC:0930Page4Year2009:RingMile0-1010-2020-3030-4040-5050-60Ring~Poulation45,401208,435.669,930416,4201,119,9006,588,075CumulativeMiles0-100-200-300-400-500-60Cumulative~Poulation,45,401253,836923,7661,340,1862,460,0869,949,891Year2015:RingMileRing~PoulationCumulativeMilesCumulative~Poulation0-1010-2020-3030-4040-5050-6044,140222,925718,350451,1001,229,7007,124,4910-100-200-300-400-500-6044,140267,065985,4151,436,5152,666,21510,878,999ItisouropinionthattheincreaseintherateofpopulationgrowthversusthatoriginallyestimatedwillnotchangetheconclusionsoftheFESreportwithregardtotheadequacyoftheplantsystems.VebaseouropiniononthefactthatCookNuclearPlant'sgaseousradioactiveeffluentreleasesaremuchlessthanwhattheFEShadprojected,andthatthemaximumindividualdoseresultingfromallplanteffluentsisonlyabout2.3percentofwhatisallowedbyourTechnicalSpecifications.Alsoitmustbenotedwearestilloperatingwithintheguidelinesof10CFR100and10CFR20,andtheradiologicalreleasesresultingfromCookNuclearPlantoperationarewellbelowtheTechnicalSpecificationlimits,3.3bccuationalExosureCookNuclearPlanthasastrongcommitmenttokeepoccupationalradiationexposureas-low-as-reasonably-achievable(ALARA).CookINuclearPlantpersonneloccupationalradiationexposurehistoryisprovidedinthefollowingtable.
Attachment1toAEP:NRC:0930Page5OccuationalExosureHistormanRemProjectedOfficialMaintenanceYearExposure(SRD)Exposure(SRD)Exposure(TLD)Exposure(SRD)86NotAvailable*829.258,672.859243.4928788891003.315555.258487.772746.037444.183645.707~666.172324.352289.252200.495496.748~NotAvailable~*Noexposureprojectionsweremadein1986~DataistakenthroughOctober31,1989~DatanotyetavailableatthetimeofthesubmittalOurcommitmenttomaintainradiationexposureALARAisfurtherexemplifiedbytheoccupationalexposuresincurredduringtheSteamGeneratorRepairProject(SGRP),whichwerereportedinAEP:NRC:0980T,TheestimatedmanRemexpenditureofthisprojectwas1032manRem.OfficialdoseasmeasuredbyTLDwas561manRem.Itwouldbeimpossibletoaccuratelypredictanumericalvalueforourannualexposure20yearsinthefuture.Wehavekeptourannualexposuretotalsconsistentlybelowtheindustryaverageformanyyears.OurfutureintentionsaretotakeadvantageoftechnologicaladvancementsandALARAoperatingimprovementssothatwecanmaintainourexposuresatorbelowtheindustryaverage.AdditionaloccupationalexposureswillresultfromdecommissioningoftheCookNuclearPlant,althoughthesedoseswouldbeincurredwithorwithoutthelicenseextensionperiods.IncreasesincorrosionproductbuildupincurredbythelicenseextensionareexpectedtobeoffsetbytechnologicalimprovementsinchemistrycontrolsandALARAoperatingimprovements.Consequently,theextendedoperatingtimeshouldhavenomeasurableadverseeffectondecoma&Lssiondoserequirements.3.4Low-LevelRadioactiveWasteInkeepingwiththespiritofitsALARAprogram,CookNuclearPlantiscommittedtokeepingitsvolumeofradioactivewastetoaminimum.OurmostrecenteffortsinthisareaincludeusingQuadrex,anoffsiteradwasteprocessor,toprocessourdryactivewaste(DAW),andtheuseofaDuratekwastewatercleanupsystem.Quadrexhasachievedanapproximate30%reductionintheburialvolumeofCookNuclearPlant'sDAW.ThisislargelyduetoQuadrex'sabilitytoputbetteremphasisonvolumereductionandmaterialrecovery.
c4+.1 Attachment1toAEP:NRC:0930Page6TheDuratekwastewatercleanupsystemusesveryspecializedionexchangemediatoremoveradioactivityfromthewater.DuratekhasreducedthevolumeofCookNuclearPlant'sliquidwasteover90%.Inthefuture,weintendtoassessnewtechnologicaldevelopmentstofurtherreducetheamountofradioactivewastegeneratedbyCookNuclearPlant.3.5SentFuelCookNuclearPlant'sspentfuelisstoredintheplant'sspentfuelpool,whichcurrentlyhasacapacityfor2050fuelassemblies.Presentfuelcycleplansindicatethatthepool,initspresentrackingconfiguration,willloseitscapacityforoneunitfullcoreoffloadin1995.Consequently,plansarebeingconsideredtorerackthepooltoaccommodate3500assemblies.Thepoolwouldthenloseitscapacityforonefullcoreoffloadbetween2007and2009.InaccordancewiththeStandardContractforDisposalofSpentNuclearFueland/orHigh-LevelRadioactiveWasteandtheNuclearWastePolicyAct,asamended,theU.S.DepartmentofEnergy(DOE)isobligatedtoacceptspentfuelfromtheutilitiesstartingin1998.InitsReporttoCongressdatedNovember1989,theDOEstatedthatthescheduleforthestartofrepositoryoperationshasslippedfromtheyear2003toapproximately2010.However,DOEalsoreconfirmeditsobligationtoacceptthespentfuelandstateditsbeliefthatwasteacceptanceatamonitoredretrievablestoragefacilitycouldbeginby1998orsoonthereafter.If,however,off-sitestorageordisposalisnotavailablewhenneeded,theCompanywilltakesuchstepsasarenecessarytostoreitsspentfuel.3.6AuaticIssuesAppendixBofCookNuclearPlant'sTechnicalSpecificationsspecifiesthataquaticissuesareaddressedbytheeffluentlimithtions,monitoringrequirementsandSection316oftheCleanWaterActrequirementscontainedintheeffectiveNPDESpermitissuedAythestateofMichigan.Section3,2ofAppendixBstatesthereportingrequirementstotheNRCofanychangestotheNPDESpermit.TheNPDESpermitisrenewedeveryfiveyearsandmaybemodifiedmorefrequentlytoassurethatthedischargestostatewaterswillnotcauseadverseenvironmentalimpactsforthelifeoftheplant.Assuch,theNPDESpermitwillassurethatnon-radiologicaldischargesfromCookNuclearPlantwillcomplywithapplicablewaterqualitystandards.
Attachment1toAEP:NRC:0930Page74.0ElectricalEuimentAssessmentExtendingtheoperatinglicensesto40yearswillnotsignificantlyimpactthesafety-relatedelectricalsystemsandequipment.Forequipmentwithinthescopeof10CFR50.49,agingreviewshavebeenconductedsoastoestablishaqualifiedlifefortheequipment.PlantManager'sInstruction(PMI)5025,Rev.3,Page4of12,Section3.2.1states:"fororiginallyinstalledcomponents,timeequalto'zero'sdefinedasthehotfunctionaltestdate."Thatis,theinstalled-but-not-operatedtimeperiodbeforestart-upina"cold"plantisnotconsideredsignificantfor40-yearqualifiedlifeequipment.Toensurethatequipmentqualificationismaintainedoverthelifeoftheplant,qualificationrelatedmaintenance/survei,llance/refurbi.shment/replacementrequirementsareintegratedintostationprocedures.Althoughsomecomponentswillbeexpectedtorequirereplacementduringtheplantlifetime,asinallpowerplants,thesew'illbereplacedusingnormalmaintenanceactivi.ties,andareunaffectedbytherequestedchangeintheoperatinglicense.Designfeatureshavebeenincorporatedandinserviceprogramsareinplacetofacilitatetheinspectionofsystemsandequipmentensuringcontinuousoperatingintegrity,Surveillanceandmaintenancepractices,whichareimplementedinaccordancewithASMEcodesandthefacilityTechnicalSpecifications,provideassurancethatanyunexpecteddegradationinplantequipmentwill,beidentifiedandcorrected.5.0ReactorVesselMaterialAnalsisAssuranceofadequatefracturetoughness.ofthereactorcoolantsystemisprovidedbycompliancewiththerequirementsforfracturetoughnesstestingincludedinSectionIIIoftheASMEBoilerandPressureVesselCodeandtheCodeofFederalRegulations,10CFR50,AppendicesGandH,and10CFR50.61.6.0SteamGeneratorReairUnit2oftheCookNuclearPlantexperiencedsecondarysidecorrosioninanumberoftubesinthefoursteamgenerators.Various-measuresweretakentoarrestthecorrosion,includingpluggingofdegradedtubes,boricacidadditionandreductionofthereactorcoolantsystemoperatingtemperature.Thereductioninoperatingtemperaturewasachievedbyoperatingtheunitat80'tpowersToincreaseavailabilityandreturntheunittofull-poweroperation,thelowerassembliesofthefoursteamgeneratorswerereplaced.Therepairpro]ectbeganonNovember21,1988,andwasbroughttoconclusiononJanuary31,1989.TheunitreturnedtoserviceonMarch17,1989.
Attachment1toAEP:NRC:0930Page8Unit2steamgeneratorrepairsweresimilartothoseofVirginiaElectricandPowerCompany'sSurryPowerStationandWisconsinElectricPowerCompany'sPointBeachNuclearPlant,Unit1(bothoftheseplantsweregrantedamendmentssimilartowhatisbeingrequestedinthissubmittal).Pursuantto10CPR50.59,anevaluationtoverifythatthesteamgeneratorrepairsdidnotposeanyunreviewedsafetyquestionsorrequiredchangestotheTechnicalSpecificationswasperformedandsubmittedtotheNRCinAEP:NRC:0980seriesoflettersstartingfromNovember7,1986.Uponreviewofoursubmittals,theNRCissuedAmendmentNo.100totheUnit2TechnicalSpecifications,whichapprovedthesteamgeneratorreplacement.Theevaluationshowedthatalthoughcertaindesignimprovementsweremade,therepairedsteamgeneratorsmatchthedesignperformanceoftheoriginalsteamgenerators.Verylittlechangewasmadetotheoriginaloperatingparameters.Therefore,theimpactontheaccidentanalyseswasinsignificant.Therepairsdidnotresultinanyadversechangesintheplantoperatingconditionsusedintheplant'slicensingbasisandthereforetheaccidentanalysesinourlicensingbasesarestillvalid.Itwasconcludedthatnounreviewedsafetyquestionsexistduetooperationwiththerepairedsteamgenerators.InanefforttoprecludesecondarysidecorrosioninthesteamgeneratorsofUnit1,theNRCissued,atourrequest,amendmentnumber126toCookNuclearPlant,Unit1,TechnicalSpecifications~Thisamendmentpermitstheunittooperateatreducedtemperatureandpressure.AsstatedintheNRC'sSafetyEvaluationReport(SER),"Thelicensee'scontractor(Westinghouse)hasdeterminedthatthisRTPprogramshouldmorethandoublethetimetoreachagivenlevelofsteamgeneratorU-tubecorrosionincomparisontotheoriginaltemperaturesandpressure."Ourintentionsaretoevaluateandimplementaccordinglyfuturetechnologicaladvancementsandoperatingimprovementstominimizeanyadditionalcorrosioninbothunits'teamgenerators.7.0kconomicAssessmentOperat&)nofCookNuclearPlantbeyonditscurrentoperatinglicenseperiodwk,llbeaconsiderablefinancialbenefittothecustomexsservedbyIndianaMichiganPower.WhenevertheCookNuclearPlantunitsretire,wewouldexpecttoreplacethemwithbase-loadcapacity.Ifthisapplicationisdenied,thiscapacitywouldhavetobereadyforservicein2009.Basedonreplacementoftheunitswithbase-loadcapacity,ourestimateshowsthecostofreplacementpowerovertheyearsthatwearerequestingtoextendCookNuclearPlant'slicensewouldbeapproximately$5.9billionin1989dollars,However,ourestimatealsoshowsthatthecosttooperatetheCookNuclearPlantunitsoverthesameperiodoftimewouldbeapproximately$1.6billion,whichisanapproximate$4.3billionsavingsin1989dollars.
Attachment1toAEP:NRC:0930Page98.0BenefitstotheServiceAreaEconomIfthisapplicationisapprovedtheunitswillcontinuetoenhancetheeconomichealthandwellbeingofthecompany'sservicearea.Theplantisama)orassettoBridgmanandsurroundingcommunitiesbyvirtueofitsongoingcontributionstothepropertytaxbaseandsecondarybenefitstothelocaleconomyfromemployeepayrollandfromexpendituresforgoodsandservicestooperatetheplant.Inaddition,aspreviouslydiscussed,customersthroughoutthecompany'sserviceareawillbenefitfromthelowercostofelectricitythatwillresultfromthecontinuedoperationoftheunitscomparedtothatofestablishingnewbase-loadcapacity.9,0SinificantHazardsConsiderationsPer10CFR50'2,aproposedamendmentwillnotinvolveasignificanthazardsconsiderationiftheproposedamendmentdoesnot:1)involveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated,2)createthepossibilityofanewordifferentkindofaccidentfromanyaccidentpreviouslyevaluated,or3)involveasignificantreductioninamarginofsafety.Criterion1Theprobabilityorconsequencesofanaccidentaredeterminedbythedesignandoperationofplantsystems.Existingpro'gramsareunaffectedbythischangeandwillremainineffectthroughoutthedurationoftheoperatinglicense,whateverdurationitis.Thus,thisproposedchangedoesnotinvolveasignificantincreaseintheprobabilityorconsequencesofanaccidentpreviouslyevaluated.Criterion2Thepchsibilityofanewordifferentkindofaccidentisnotcreated'ythisproposedchangesinceitdoesnotinvolvehardwareorproceduralmodifications.Surveillanceandmaintenancepractices,whichareimplementedinaccordancewiththeASMEcodeandthefacilityTechnicalSpecifications,provideassurancethatanyunexpecteddegradationinplantequipmentwillbeidentifiedandcorrected.Thus,anydegradationthatmightcreateadifferentkindofaccidentwouldbedetectedandcorrectedbyexistingprogramsandroutinemaintenance.
Attachment1toAEP:NRC:0930Page10Criterion3Thisproposedchangedoesnotinvolveasignificantreductioninamarginofsafety.TheCookNuclearPlantUnits1and2weredesignedandconstructedfora40-yearoperatinglife.Inaddition,existingprograms,routinemaintenance,andexistingTechnicalSpecificationsprovideassurancethatanadequatemarginofsafetyismaintained.Theseactivitieswillremainineffectthroughthedurationoftheoperatinglicense.Thus,theextensionofthedurationoftheoperatinglicensedoesnotresultinareductioninanymarginofsafety.Thus,weconcludethatthechangedoesnotinvolveasignificanthazardsconsiderationasdefinedby10CFR50.92,whichisconsistentwithpreviousNRCactionsonapplicationsofthistype.