ML17331A091

Proposed Tech Specs Supporting Request to Allow Interim Plugging Criteria of 1.0 Volt for Cycle 14

ML17331A091
Person / Time
Site:	Cook
Issue date:	03/10/1993
From:	INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML17331A090	List: ML17331A089 ML17331A091
References
NUDOCS 9303160110
Download: ML17331A091 (12)

Text

ATTACHMENT3toAEP:NRC:1166GPROPOSEDREVISEDTECHNICALSPECIFICATIONSPAGES9303i601ip9303i0PDRADQCK'50003i5P,'DR REACTORCOOLANTSYSTEMSURVEILLANCEREUIREMENTSContinuedTubesinthoseareaswhereexperiencehasindicatedpotentialproblems.Atubeinspection(pursuanttoSpecification4.4.5.4.a.8)shallbeperformedoneachselectedtube.Ifanyselectedtubedoesnotpermitthepassageoftheeddycurrentprobeforatubeinspection,thisshallberecordedandanadjacenttubeshallbeselectedandsubjectedtoatubeinspection.c.Thetubesselectedasthesecond'andthirdsamples(ifrequiredbyTable4.4-2)duringeachinserviceinspectionmaybesubjectedtoapartialtubeinspectionprovided:Thetubesselectedforthesamplesincludethetubesfromthoseareasofthetubesheetarraywheretubeswithimperfectionswerepreviouslyfound.d.2:Theinspectionsincludethoseportionsofthetubeswhereimperfectionswerepreviouslyfound.Implementationofthesteamgeneratortube/tubesupportplateinterimpluggingcriteriaforonefuelcycle(Cycle14)requiresa100Xbobbincoilinspectionforhotlegtubesupportplateintersectionsandcoldlegintersectionsdowntothelowestcoldlegtubesupportplatewithknownouterdiameterstresscorrosioncracking(ODSCC)indications.Theresultsofeachsampleinspectionshallbeclassifiedintooneofthefollowingthreecategories:CaterInsectionResultsC-lLessthan5Xofthetotaltubesinspectedaredegradedtubesandnoneoftheinspectedtubesaredefective.C-2Oneormoretubes,butnotmorethan1Xofthetotaltubesinspectedaredefective,orbetween5Xand10Xofthetotaltubesinspectedaredegradedtubes.C-3iMorethan10Xofthetotaltubesinspectedaredegradedtubesormorethan1Xoftheinspectedtubesaredefective.COOKNUCLEARPLANT-UNIT13/44-8AMENDMENTNO.%3,~~

REACTORCOOLANTSYSTEMOPERATIONALLEAKAGELIMITINGCONDITIONFOROPERATION3.4.6.2ReactorCoolantSystemleakageshallbelimitedto:a.NoPRESSUREBOUNDARYLEAKAGE,b.1GPMUNIDENTIFIEDLEAKAGE,c~600gallonsperdaytotalprimary-to-secondaryleakagethroughallsteamgeneratorsand150gallonsperdaythroughanyonesteamgeneratorforFuelCycle14.d.10GPMIDENTIFIEDLEAKAGEfromtheReactorCoolantSystem,e.Seallineresistancegreaterthanorequalto2.27E-lft/gpm~and,f.1GPMleakagefromanyreactorcoolantsystempressureisolationvalvespecifiedinTable3.4-0.APPLICABILITY:MODES1,2,3and4.~ACTION'~WithanyPRESSUREBOUNDARYLEAKAGE,beinatleastHOTSTANDBYwithin6hoursandinCOLDSHUTDOWNwithinthefollowing30hours.b.WithanyReactorCoolantSystemleakagegreaterthananyoneoftheabovelimits,excludingPRESSUREBOUNDARYLEAKAGE,reducetheleakageratetowithinlimitswithin4hoursorbeinatleastHOTSTANDBYwithinthenext6hoursandinCOLDSHUTDOWNwithinthefollowing30hours.c~Withanyreactorcoolantsystempressureisolationvalve(s)leakagegreaterthantheabovelimit,exceptwhen:Theleakageislessthanorequalto5.0gpm,and2.Themostrecentmeasuredleakagedoesnotexceedthepreviousmeasuredleakage*byanamountthatreducestheTosatisfyALARArequirements,measuredleakagemaybemeasuredindirectly(asfromtheperformanceofpressureindicators)ifaccomplishedinaccordancewithapprovedproceduresandsupportedbycomputationsshowingthatthemethodiscapableofdemonstratingvalvecompliancewiththeleakagecriteria.Specification-3.4:6.2.eisapplicablewithaveragepressurewithin20psiofthenominalfullpressurevalue.COOKNUCLEARPLANT-UNIT13/44-16AmendmentNo.+62-466-OrderdatedApril20,1981

\~C~

EACTORCOOLANTSYSTEM~ASES3445STEAMGENERATORSTUBEINTEGRTheSurveillanceRequirementsforinspectionofthesteamgeneratortubesensurethatthestructuralintegzityofthisportionoftheRCSwillbemaintained.TheprogramforinserviceinspectionofsteamgeneratortubesisbasedonamodificationofRegulatoryGuide1.83,Revisionl.Inservice-inspectionofsteamgeneratortubingisessentialinordertomaintainsuzveillanceoftheconditionsofthetubesintheeventthat:thereisevidenceofmechanicaldamageorprogressivedegradationduetodesign,manufacturingerrors,orinserviceconditionsthatleadtocorrosion.Insezvtceinspectionofsteamgeneratortubingalsoprovidesameansofcharacterizingthenatureandcauseof.anytubedegradationsothatcorrectivemeasurescanbetaken.Theplantisexpectedtobeoperatedinamannersuchthatthesecond-arycoolantwillbemaintainedwithinthosechemistrylimitsfoundtoresult:innegligiblecorrosionofthesteamgeneratortubes.Xfthesecondarycoolantchemistryisnotmaint:ainedwithintheseparameterlimits,localizedcorrosionmaylikelyresultinstresscorrosioncracking.Theextentofcrackingduringplantoperationwouldbelimitedbythelimitationofsteamgeneratortubeleakagebetweentheprimarycoolantsystemand.thesecondarycoolantsystem.Theallowableprimary-to-secondaryleakrateis150gallonsperdaypersteamgeneratorforonefuelcycle(Cycle14).Axialorcircumferentiallyorientedcrackshavingaprimary-to-secondaryleakagelessthanthislimit:duringoperationwillhaveanadequatemarginofsafetytowithstandt:heloadsimposedduringnormaloperationandbypostulatedaccidents.Leakageinexcessofthislimitwillrequireplantshutdownandaninspection,duringwhichtheleakingtubeswillbelocatedandpluggedorrepaired.AsteamgeneratorwhileundergoingcreviceflushinginMode4isavailablefordecayheatremovalandisoperable/operatinguponreinstatementofauxiliaryormainfeedflowcontrolandsteamcontrol.Wastage-typedefectsareunlikelywiththeallvolatiletreatment(AVT)ofsecondarycoolant.However,evenifadefect:ofsimilartypeshoulddevelopinservice,itwillbefoundduringscheduledinservicest:earngeneratortubeexaminations.PluggingorsleevingwillberequiredforalltubeswithimperfectionsexceedingtherepairlimitwhichisdefinedinSpecification4.4.5.4.a.Steamgeneratortubeinspectionsofoperatingplantshavedemonst:ratedthecapabilitytoreliablydetectdegradationthathaspenetrated20Xoftheoriginaltubewallthickness.Tubesexpeziencingouterdiameterstresscorrosioncrackingwithinthethicknessofthetubesupportarepluggedorrepairedbythecriteriaof4.4.5.4.a.10,COOKNUCLEARPLANT-UNIT1B3/44-2aAMENDMENTNO.403,~

EACTORCOOLANSYSTBASESMaintaininganoperatingleakagelimitof150gpdpersteamgenerator(600gpdtotal)forFuelCycle14willminimizethepotentialforalargeleakageeventduringsteamlinebreakunderLOCAconditions.BasedontheNDEuncertainti.es,bobbincoilvoltagedistributionandcrackgrowthratefromthepreviousinspection,theexpectedleakratefollowingasteamlineruptureislimitedtobelow120gpminthefaultedloopand150gpdpersteamgeneratorintheintactloops,whichwilllimitoffsitedosestowithin10percentofthe10CFR100guidelines.Iftheprojectedendofcycledistributionofcrakindicationsresultsinprimary-to-secondazyleakagegreaterthan120gpminthefaultedloopduringapostulatedsteamlinebreakevent,additionaltubesmustberemovedfromserviceinordertoreducethepostulatedprimary-to-secondarysteamlinebreakleakagetobelow120gpm.PRESSUREBOUNDARYLEAKAGEofanymagnitudeisunacceptablesinceitmaybeindicativeofanimpendinggrossfailureofthepressureboundary.ShouldPRESSUREBOUNDARYLFAKAGEoccurthroughacomponentwhichcanbeisolatedfromthebalanceoftheReactorCoolantSystem,plantoperati.onmaycontinueprovidedtheleakingcomponentispromptlyisolatedfromtheReactorCoolantSystemsinceisolationremovesthesourceofpotentialfailure.TheSurveillanceRequirementsforRCSPressureIsolationValvesprovideaddedassuranceofvalveintegritytherebyreducingtheprobabilityofgrossvalvefailureandconsequentintersystemLOCA.LeakagefromtheRCSPressureIsolationValvesisIDENTIFIEDLEAKAGEandwillbeconsideredasaportionoftheallowedlimit.344CHEMISTRYThelimitationsonReactorCoolantSystemchemistryensurethatcorrosionoftheReactorCoolantSystemisminimizedandreducesthepotentialforReactorCoolantSystemleakageorfailureduetostresscorrosion.Maintaining.thechemistrywithintheSteadyStateLimitsprovidesadequatecorrosionprotectiontoensurethestructuralintegrityoftheReactorCoolantSystemoverthelifeoftheplant.Theassociatedeffectsofexceedingtheoxygen,chloride,andfluoridelimitsaretimeandtemperaturedependent.Corrosionstudiesshowthatoperati,onmaybecontinuedwithcontaminantconcentrationlevelsinexcessoftheSteadyStateLimits,uptotheTransientLimits,forthespecifiedlimitedtimeintervalswithouthavingasignificanteffectonthestructuralintegrityoftheReactorCoolantSystem.Thetimeintervalpermi,ttingcontinuedoperationwithintherestrictionsoftheTransi.entLimitsprovidestimefortakingcorrectiveactionstorestorethecontaminantconcentrationstowithintheSteadyStateLimits.COOKNUCLEARPLANT-UNIT1B3/44-4AMENDMENTNO.~~

ATTACHMENT4toAEP:NRC:1166GCURRENTPAGESMARKED-UPTOREFLECTPROPOSEDCHANGES CTOCOOLANSEHSURILLANCEIREMESContinued2.Tubesinthoseareaswhereexperiencehasindicatedpotentialproblems.Atubeinspection(pursuanttoSpecification4.4.5.4.a.8)shallbeperformedoneachselectedtube.Ifanyselectedtubedoesnotpermitthepassageoftheeddycurrentprobeforatubeinspection,thisshallberecordedandanad5acenttubeshallbeselectedandsub]ectedtoatubeinspection.c.Thetubesselectedasthesecondandthirdsamples(ifrequiredbyTable4.4-2)duringeachinsezviceinspectionmaybesub]ectedtoapartialtubeinspectionprovided:1.Thetubesselectedforthesamplesincludethetubesfromthoseareasofthetubesheetarraywheretubeswithimperfectionswerepreviouslyfound.2,Theinspectionsincludethoseportionsofthetubeswhereimperfectionswerepreviouslyfound.H"'.Implementationofthesteamgeneratortube/tubesuppplateinterimpluggingcriteriaforonefuelcycle(Cycle'equiresa100'tbobbincoilinspectionforhot.legtubesupportplateintersectionsandcoldlegintersectionsdowntothelowestcoldlegtubesupportplatewithKnownouterdiameterstresscorrosioncracking(ODSCC)indications.Theresultsofeachsampleinspectionshallbeclassifiedintooneofthefollowingthreecategories:CategoOInsectionResultsC-lLessthan5tofthetotaltubesinspectedaredegradedtubesandnoneoftheinspectedtubesaredefective.C-2Oneormoretubes,butnotmorethan1%ofthetotaltubesinspectedaredefective,orbetween5%and10%ofthetotaltubesinspectedaredegradedtubes.C-3Morethan10%ofthetotaltubesInspectedaredegradedtubesormorethan1%oftheinspectedtubesaredefective.COOKNUCLEARPLANT-UNIT13/44-8AMENDMENTNO.O8,454166 0GC3.4.6.2ReactorCoolantSystemleakageshallbelimitedto:a.NoPRESSUREBOUNDARYLEAKAGE,b.C~IGPEmIDEETZEZEDIEliEAGE,600gallonspezdaytotalpzry-to-secondazyleakagethroughallsteamgeneratorsand150onsperdaythroughanyonesteamgeneratorforFuelCyclePd.e.10GPEIDENTIFIEDLEDGEfromtheReactorCoolantSystem,Seallineresistancegreaterthanozequalto2.27E-lft/gpm~and,f.1GPNleakagefromanyreactorcoolantsystempressureisolationvalvespecifiedinTable3.4-0.AOTZOE'ithanyPRESSUREBOUNDARYLEAKAGE;beinatleastHOTSTANDBYwithin6hoursandinCOLDSHUTDOWNwithinthefollowing30houzs.b.WithanyReactorCoolantSystemleakagegreaterthananyoneoftheabo~elimits,excludingPRESSUREBOUNDARYIKKAGE,reducetheleakageratetowithinlimitswithin4hoursozbeinatleastHOTSTANDBYwithinthenext6hoursandinCOLDSHUTDOWNwithinthefollowing30hours.C~Withanyreactorcoolantsystempressureisolationvalve(s)leakagegreaterthantheabovelimit,exceptwhen:l.Theleakageislessthanorequalto5.0gpm,and2.Themostrecentmeasuredleakagedoesnotexceedthepreviousmeasuredleakage*byanamountthatreducestheTosatisfy~iRArequirements,measuredleakagemaybemeasuredindirectly(asfromtheperformanceofpressureindicators)ifaccomplishedinaccordancewithapprovedproceduresandsupportedbycomputationsshowingthatthemethodiscapableofdemonstratingvalvecompliancewiththeleakagecriteria.Specification3.4.6.2.eisapplicablewithaveragepzessure-within20.psiofthenominalfullpressurevalue.COOKNUCLEARPLANT-UNIT13/44-16AMENDMENTNO.444166OrderdatedApril20,1981 4.4TheSurveillanceRequirementsforinspectionofthesteamgeneratortubesensurethatthestructuralintegrityofthisportionoftheRCSwillbemaintained.TheprogramforinserviceinspectionofsteamgeneratortubesisbasedonamodificationofRegulatoryGuide1.83,Revisionl.Inserviceinspectionofsteamgeneratortubingisessentialinordertomaintainsurveillanceoftheconditionsofthetubesintheeventthatthereisevidenceofmechanicaldamageorprogressivedegradationduetodesign,manufacturingerrors,orinserviceconditionsthatleadtocorrosion.Inserviceinspectionofsteamgeneratortubingalsoprovidesameansofcharacterizingthenatureandcauseofanytubedegradationsothatcorrectivemeasurescanbetaken.Theplantisexpectedtobeoperatedinamannersuchthathesecond-arycoolantwillbemaintainedwithinthosechemistrylimitsoundtoresultinnegligiblecorrosionofthesteamgeneratortubes.Ifesecondarycoolantchemistryisnotmaintainedwithintheseparametelimits,localizedcorrosionmaylikelyresultinstresscorrosioncrackingTheextentofcrackingduringplantoperationwouldbelimitedbytheimitationofsteamgeneratortubeleakagebetweentheprimarycoolantsystandthesecondarycoolantsystem.Theallowableprimary-to-secondarylerareis150gallonsperdaypersteamgeneratorforonefuelcycle(Cycle.Axialorcircumferentiallyorientedczackshavingaprimary-to-secondaryleakagelessthanthislimitduringoperationwillhaveanadequatemarginofsafetytowithstandtheloadsimposedduringnormaloperationandbypostulatedaccidents.Leakageinexcessofthislimitwillrequireplantshutdownandaninspection,duringwhichtheleakingtubeswillbelocatedandpluggedorrepaired.AsteamgeneratorwhileundergoingcreviceflushinginMode4isavailablefordecayheatremovalandisoperable/operatinguponreinstatementofauxiliaryormainfeedflowcontzolandsteamcontrol.Wastage-typedefectsazeunlikelywiththeallvolatQ.etreatment(AVT)ofsecondarycoolant.However,evenifadefectofsimilartypeshoulddevelopinservice,itwillbefoundduringscheduledinsezvicesteamgeneratortubeexaminations.PluggingorsleevtngwillberequiredforalltubeswithimperfectionsexceedingtherepairlimitwhichisdefinedinSpecification4.4.5.4.a.Steamgeneratortubeinspectionsofoperatingplaneshavedemonstratedthecapabilitytoreliablydetectdegradationthathaspenetrated20%oftheoriginaltubewallthickness.Tubesexperiencingouterdiameterstresscorrosioncrackingwithinthethicknessofthetubesupportplatesarepluggedorrepairedbythecriteriaof4.4.5.4.a.10.COOKNUCLEARPLANT"UNIT1B3/44-2aAMENDMENTNO.~~166 s'.0COCOrXhZZMaintaininganoperating1gelimitof150gpdpersteamgenerator(600gpdtotal)forFuelCyclewillminimizethepotentialforalargeleakageeventduringsteamlinereekunderLOCAconditions.BasedontheNDEuncertainties,bobbincoilvoltagedistributionandcrackgrowthratefromthepreviousinspection,theexpectedleakratefollowingasteamlineruptureislimitedtobelow120gpminthefaultedloopand150gpdpersteamgeneratorintheintactloops,whichwilll~toffsitedosestowithin10percentofthe10CFR100guidelines.Iftheprojectedendofcycledistributionofcrackindicationsresultsinprimary-to-secondaryleakagegreaterthan120gpminthefaultedloopduringapostulatedsteamlinebreakevent,additionaltubesmustberemovedfromserviceinordertoreducethepostulatedprimary-to-secondarysteamlinebreakleakagetobelow120gpm.PRESSUREBOUNDARYLEAKAGEofanymagnitudeisunacceptablesinceitmaybeindicativeofanimpendinggrossfailureofthepressureboundary.ShouldPRESSUREBOUNDARYLEAKAGEoccurthroughacomponentwhichcanbeisolatedfromthebalanceoftheReactorCoolantSystem,plantoperationmaycontinueprovidedtheleakingcomponentispromptlyisolatedfromtheReactorCoolantSystemsinceisolationremovesthesourceofpotentialfailure.IITheSurveillanceRequirementsfozRCSPressureIsolationValvesprovideaddedassuranceofvalveintegritytherebyreducingtheprobabilityofgrossvalvefailureandconsequentintersystemLOCA.LeakagefromtheRCSPressureIsolationValvesisIDENTIFIEDLEAKAGEandwillbeconsideredasaportionoftheallowedlimit./34.4.7KiEMISTRYThelimitationsonReactorCoolantSystemchemistryensurethatcorrosionoftheReactorCoolantSystemisminimiedandreducesthepotentialforReactorCoolantSystemleakageorfailureduetostresscorrosion.HaintainingthechemistrywithintheSteadyStateLimitsprovidesadequatecorrosionprotectiontoensurethestzucturalintegrityoftheReactorCoolantSystemoverthelifeoftheplant.Theassociatedeffectsofexceedingtheoxygen,chloride,andfluoridelimitsaretimeandtemperaturedependent.CorrosionstudiesshowthatoperationmaybecontinuedwithcontaminantconcentrationlevelsinexcessoftheSteadyStateLimits,uptotheTransientLimits,forthespecifiedlimitedtimeintervalswithouthavingasignificanteffectonthestructuralintegrityoftheReactorCoolantSystem.ThetimeintervalpermittingcontinuedoperationwithintherestrictionsoftheTransientLimitsprovidestimefortakingcorrectiveactionstorestorethecontaminantconcentrationstowithintheSteadyStateLimits.COOKNUCLEARPLANT-UNIT1B3/44-4hK?HDHENTNOM6 t.l~~IOlgg,C,S!Ilt'4j~e4