ML17335A358
| ML17335A358 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/03/1998 |
| From: | INDIANA MICHIGAN POWER CO. |
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| NUDOCS 9812080046 | |
| Download: ML17335A358 (27) | |
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ATTACHMENT 2ATOAEP:NRC:09000TECHNICAL SPECIFICATIONS PAGESMARKEDTOSHOWPROPOSEDCHANGESREVISEDPAGESUNIT13/46-27B3/46-4'P8i208004b 98i203PDR 3/4LIMITINGCONDITIONS FOROPERATION ANDSURVEILLANCE REQUIREMENTS 3/4.6CONTAINMENT SYSTEMSSURVEILLANCE REUIREMENTS Continued 4tD'aEO'ostgCd)C4OQCJ4C5OOOo~gyOcrtclstggO~O~rnCtgsts~Q~styOBBca3.48gW4E0gigQtshallbeconstituted ofonebasketeachfromRadialRowsI,2,4,6,8and9(orfromthesamerowofanadjacentbayifabasketfromadesignated rowcannotbeobtainedforweighing) withineachbay.Ifanybasketisfoundtocontainlessthan1333poundsofice,arepresentative sampleof20additional basketsfromthesamebayshallbcweighed.Theminimumaverageweightoficefromthe20additional basketsandthediscrepant basketshallnotbeless,than1333pounds/basket ata95%levelofconfidence.
Theicccondenser shallalsobesubdivided into3groupsofbaskets,asfollows:Group1-baysIthrough8,Group2-bays9through16,andGroup3-bays17through24.TheminimumaverageiceweightofthesamplebasketsfromRadialRowsI,2,4,6,8and9ineachgroupshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
Theminimumtotalicecondenser iccweightata95%levelofconfidence shallbecalculated usingallicebasketweightsdetermined duringthisweighingprogramandshallnotbclessthan2,590,000 pounds.+gVerifying, byavisualinspection ofatieastinve fioutAptutsegee pericecondenser bay,thattheaccumulation offrostoriceonflowbetweenicebasketsandpastlatticeramesisrestricttoanommalthickness of3/8inches.Ifonefiow+ssage-perbayisfoundtohaveanaccumulation offrostoricegreaterthanthisthickness, arepresentative sampleof20additional floromthesame++bayshallbevisuallyinspected.
Iftheseadditional flowIaesagesarefoundacceptable, thcsurveillance programmayproceedconsidering thesingl'cdeficiency asuniqueandacceptable.
Morethanonerestricted flowpaseegggperbayisevidenceofabnormaldegradation Atleastonceper40monthsbyliftingandvisuallyinspecting theaccessible portionsofatleasttwoicebasketsfromeach1/3oftheicecondenser andverifying thattheicebasketsarefreeofdetrimental structural wear,cracks,corrosion orotherdamage.Theicebasketsshallberaisedatleast12feetforthisinspection.
Atleastonceper18monthsbyverifying, byavisualinspection, ofeachicecondenser bay,thattheaccumulation offrostoriceonthelowerplenumsupportstr'uctures
~tunungvane'srestricted toanominalthickness of3/8inches.Anaccumulation offrostoricegreaterthanthisthickness isevidenceofabnormaldegradation oftheicecondenser.
andwillrequirea100%inspection ofthatbaytodetermine, bycalculation, thatthctotalflowpassageblockageislessthanthe15%assumedintheanalysisoflowersubcompartment pressurization following a,LOCAorMSLB.Gys&rswK/44ghw~~a/~COOKNUCLEARPLANT-UNIT 1Page3/46-27AMENDMENT 408,AQUA,438,444,220 3/4BASES3/4.6CONTAINMENT SYSTEMS'3/4.6.5'ICECONDENSERTherequirements associated witheachofthecomponents oftheicecondenser ensurethattheoverallsystemwillbeavailable toprovidesufficient pressuresuppression capability tolimitthecontainment peakpressuretransient tolessthanl2psigduringLOCAconditions.
3/4.6.5.1 ICEBEDTheOPERABILITY oftheicebedensuresthattherequirediceinventory willI)bedistributed evenlythroughthecontainment bays,2)containsufficient borontoprecludedilutionofthecontaininent sumpfollowing theLOCAand3)containsufficient heatremovalcapability tocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditions areconsistent withtheassumptions usedintheaccidentanalyses.
Theminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservative allowance foricelossthroughsublimation.
Intheeventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions afterthreeyearsofoperation, theminimumicebasketsweightmaybeadjusteddownward.
Inaddition, thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperation ifsuchareduction issupported byobservedsublimation data.3/4.6.5.2 ICEBEDTEMPERATURE MONITORING SYSTEMTheOPERABILITY oftheicebedtemperature monitoring systemensuresthatthecapability isavailable formonitoring theicetemperature.
Intheeventthemonitoring systemisinoperable, theACTIONrequirements provideassurance thattheicebedheatremovalcapacitywillberetainedwithinthespecified timelimits.COOKNUCLEARPLANT-UNIT IPageB3/4&4AMENDMENT 480,220
INSERTFORPAGEB3/46-4(Unit1)\Thecontainment sub-compartment analysesassumesa15%blockagethroughout theicecondenser flowpaths.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations, andincludesthenetopenareaatthesesupportelevations.
Thisincludestheflowarealeftbetweenthecranewallandthecontainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatelevation, thatincludesicebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairductsandwallpanelcradlesandotherappurtenances.
Insummary,aflowchannelconsistsoftheannularareaoutsideofeachbasketandone-halfofthetriangular areasformedbythelatticesupportsbetweenbaskets,suchthatthesumoftheseareasaroundeachbasketequalsthetotalflowareainthebay.Flowchannelsinradialrowsoneandnineincludetheareabetweenthebasketandthecontainment andcranewallrespectively.
Thereareatotalof81flowchannelsineachbay-onepericebasket.Theselection ofoneflowchanneleachfromradialrows1and9assuresthattheinspection shouldincludethoseareaswhere,basedonexperience, itisexpectedtoseefrostbuild-upfirst.The3/8"frostoriceaccumulation inaflowchannelcriterion providesonlyanindicator oficecondenser condition.
Thelatticeframethickness is3/8",andtherefore, thisdimension providesaconvenient visualreference duringflowchannelinspections.
Frostoricebuildupinexcessof3/8"shallbeevaluated byselecting afurtherrepresentative sampleof20flowchannelsthatspiraloutwardfromtheaffectedflowchannel.Thissamplepopulation assuresthattheareasaroundandadjacenttotheblockedchannelarealsoinspected.
Morethanonerestricted flowchannelperbayrequiresa100%inspection ofthebayandcalculation toensurethatthe15%blockagelimitismet.Becausetheminimumicecondenser flowareaineachicecondenser bayoccursatthelatticeframesupportelevations, theinspection ofthelowerinletplenumsupportstructures andturningvanes,topdeckfloorgratingandintermediate deckalsoprovidesonlyanindicator oftheoverallicecondenser condition.
The3/8"thickness criterion providesathreshold toprovidereasonable assurance thatanyfrostoricebuildupiscorrected wellbeforethe15%blockageassumption isapproached intheseareas.
ATTACHMENT 2BTOAEP:NRC:09000 TECHNICAL SPECIFICATIONS PAGESMARKEDTOSHOWPROPOSEDCHANGESREVISEDPAGESUNIT2
3/4LIMITINGCONDITIONS FOROPERATION ANDSURVEILLANCE REQUIREMENTS 3/4.6CONTAINMENT SYSTEMSSURVEILLANCE REUlREMENTS Continued 4'OtDCO'OCtgCOCOOO'aOOOOCtgOOjlyVlOQ~CtoCO~cnCtgcntnOtyP.Cc,shallbeconstituted ofonebasketeachfromRadialRows1,2,4,6,8and9(orfromthesamerowofanadjacentbayifabasketfromadesignated rowcannotbeobtainedforweighing) withineachbay.Ifanybasketisfoundtocontainlessthan1333poundsofice,arepresentative sampleof20additional basketsfromthesamebayshallbeweighed.Theminimumaverageweightoficefromthe20additional basketsandthediscrepant basketshallnotbelessthan1333pounds/ba'sket ata95%levelofconfidence.
Theicecondenser shallalsobesubdivided into3groupsofbaskets,asfollows:Group1-bays1through8,Group2-bays9through16,andGroup3-bays17through24.TheminimumaverageiceweightofthesamplebasketsfromRadialRows1,2,4,6,8and9ineachgroupshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
3.Theminimumtotalicecondenser iceweightata95%levelofconfidence shallbecalculated usingallicebasketweightsdetermined duringthisweighingprogramandshallnotbelessthan2,590,000 pounds.Verifying, byavisualinspection ofatteastjttwe tlowgpassegee pericecondenser bay,thattheaccumulation offrostoriceonflowbetweenicebasketsandpastlatticeramesisrestricttoanoaunalicknessof3/8mches.Ifoneflowjgssage-perbayisfoundtohaveanaccumulation of.frostoricegreaterthanthisthickness, arepresentative sampleof20additional floromthesamebayshalbevisu~lyinspect~.
Iftheseaddition~
flow~mmearefoundacceptable, thesurveillance programmayproceedconsidering thesingledeficiency asuniqueandacceptable.
Morethanonerestricted flowpassageperbayisevidenceofabnormaldegradation Atleastonceper40monthsbyliftingandvisuallyinspecting theaccessible portionsofatleasttwoicebasketsfromeach1/3oftheicecondenser andverifying thattheicebasketsarefreeofdetrimental structural wear,cracks,corrosion orotherdamage.Theicebasketsshallberaisedatleast12feetforthisinspection.
Atleastonceper18monthsbyverifying, byavisualinspection, ofeachicecondenser bay,thattheaccumulation offrostoriceonthelowerplenumsupportstiuctures andgturnmgvan'srestricted toanominalthickness of3/8inches.Anaccumulation offrostoricegreaterthanthisthickness isevidenceofabnormaldegradation oftheicecondenser.
andwillrequirea100%inspection ofthatbaytodetermine, bycalculation, thatthetotalflowpassageblockageislessthanthe15%assumedintheanalysisoflowersubcompartment pressurization following aLOCAorMSLB.vV&tlapnate,/Q44Cj~nna/X COOKNUCLEARPLANT-UNIT 2Page3/46-36AMENDMENT QO,42$,204 3/4BASES3/4.6CONTAINMENT SYSTEMS3/4.6.4COMBUSTIBLE GASCONTROL'L~TheOPERABILITY oftheequipment andsystemsrequiredforthedetection andcontrolofhydrogengasensuresthatthisequipment willbeavailable tomaintainthehydrogenconcentration withincontainment belowitsflammable limitduringpost-LOCA conditions.
Eitherrecombiner unitiscapableofcontrolling theexpectedhydrogengeneration associated with:I)'zirconium-water reactions; 2)radiolytic decomposition ofwater;and3)corrosion ofmetalswithincontainment.
Thesehydrogencontrolsystemsareconsistent withtherecommendations ofRegulatory Guide1.7,"ControlofCombustible GasConcentrations inContainment Following aLOCA,"March1971.Theacceptance criterion of10,000ohmsisbasedonthetestbeingperformed withtheheaterelementatanambienttemperature, butcanbeconservatively appliedwhentheheaterelementisatatemperature aboveambient.3/4.6.5ICECONDENSER Therequirements associated witheachofthecomponents oftheicecondenser ensurethattheoverallsystemwillbeavailable toprovidesufficient pressuresuppression capability tolimitthecontainment peakprcssuretransient tolessthan12psigduringLOCAconditions.
3/4.6.5.1 ICEBEDTheOPERABILITY oftheicebedensuresthattherequirediceinventory willI)bedistributed evenlythroughthecontainment bays,2)containsufficient borontoprecludedilutionofthecontainment sumpfollowing theLOCAand3)containsufficient heatremovalcapability tocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditions areconsistent withtheassumptions usedintheaccidentanalyses.
Theminimumweightfigureof1333poundsof,iceperbasketcontainsa5%conservative allowance foricelossthroughsublimation.
Intheeventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions afterthreeyearsofoperation, theminimumicebasketsweightmaybeadjusteddownward.
Inaddition, thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperation ifsuchareduction issupported byobservedsublimation data.3/4.6.5.2 ICEBEDTEMPERATURE MONITORING SYSTEMTheOPERABILITY oftheicebedtemperature monitoring systemensuresthatthecapability isavailable formonitoring theicetemperature.
Intheeventthemonitoring systemisinoperable, theACTIONrequirements provideassurance thattheicebedheatremovalcapacitywillberetainedwithinthespecified timelimits.COOKNUCLEARPLANT-UNIT 2PageB3/464AMENDMENT 4,444,104,207 INSERTFORPAGEB3/46-4(Unit2)lThecontainment sub-compartment analysesassumesa15%blockagethroughout theicecondenser flowpaths.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations, andincludesthenetopenareaatthesesupportelevations.
Thisincludestheflowarealeftbetweenthecranewallandthecontainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatele'vation, thatincludesicebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairductsandwallpanelcradlesandotherappurtenances.
Insummary,aflowchannelconsistsoftheannularareaoutsideofeachbasketandone-halfofthetriangular areasformedbythelatticesupportsbetweenbaskets,suchthatthesumoftheseareasaroundeachbasketequalsthetotalflowareainthebay.Flowchannelsinradialrowsoneandnineincludetheareabetweenthebasketandthecontainment andcranewallrespectively.
Thereareatotalof81flowchannelsineachbay-onepericebasket.Theselection ofoneflowchanneleach,fromradialrows1and9assuresthattheinspection shouldincludethoseareaswhere,basedonexperience, itisexpectedtoseefrostbuild-upfirst.The3/8"frostoriceaccumulation inaflowchannelcriterion providesonlyanindicator oficecondenser condition.
Thelatticeframethickness is3/8",andtherefore, thisdimension providesaconvenient visualreference duringflowchannelinspections.
Frostoricebuildupinexcessof3/8"shallbeevaluated furtherbyselecting afurtherrepresentative sampleof20flowchannelsthatspiraloutwardfromtheaffectedflowchannel.Thissamplepopulation assuresthattheareasaroundandadjacenttotheblockedchannelarealsoinspected.
Morethanonerestricted flowchannelperbayrequiresa100%inspection ofthebayandcalculation toensurethatthe15%blockagelimitismet.Becausetheminimumicecondenser flowareaineachicecondenser bayoccursatthelatticeframesupportelevations,
.theinspection ofthelowerinletplenumsupportstructures andturningvanes,topdeckfloorgratingandintermediate deckalsoprovidesonlyanindicator oftheoverallicecondenser condition.
The3/8"thickness criterion providesathreshold toensurethatanyfrostoricebuildupiscorrected wellbeforethe15%blockageassumption isapproached intheseareas.
ATTACHMENT 3ATOAEP:NRC:09000PROPOSEDTECHNICAL SPECIFICATIONS PAGESREVISEDPAGESUNIT1 3/4LIMITINGCONDITIONS FOROPERATION ANDSURVEILLANCE REQUIRIMENTS 3/4.6CONTAINMENT SYSTEMSSurveillance.Re uirements Continued shallbeconstituted ofonebasketeachfromRadialRows1,2,4,6,8and9(orfromthesamerowofanadjacentbayifabasketfromadesignated rowcannotbeobtainedforweighing) withineachbay.Ifanybasketisfoundtocontainlessthan1333poundsofice,arepresentative sampleof20additional basketsfromthesamebayshallbeweighed.Theminimumaverageweightoficefromthe20additional basketsandthediscrepant basketshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
Theicecondenser shallalsobesubdivided into3groupsofbaskets,asfollows:Group1-bays1through8,Group2-bays9through16,andGroup3-bays17through24.TheminimumaverageiceweightofthesamplebasketsfromRadialRows1,2,4,6,8and9ineachgroupshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
Theminimumtotalicecondenser iceweightata95%levelofconfidence shallbecalculated usingallicebasketweightsdetermined duringthisweighingprogramandshallnotbelessthan2,590,000 pounds.Verifying, byavisualinspection ofatleastfourflowchannelspericecondenser bay,thattheaccumulation offrostoriceonflowchannelsbetweenicebasketsandpastlatticeframesisrestricted toanominalthickness of3/8inches.Flowchannelswillbeselectedasfollows:twoatrandomfromradialrows2through8andoneeachfromradialrows1and9.Ifoneflowchannelperbayisfoundtohaveanaccumulation offrostoricegreaterthanthisthickness, arepresentative sampleof20additional flowchannelsfromthesamebayshallbevisuallyinspected.
Iftheseadditional flowchannelsarefoundacceptable, thesurveillance programmayproceedconsidering thesingledeficiency asuniqueandacceptable.
Morethanonerestricted flowchannelperbayisevidenceofabnormaldegradation andwillrequirea100%inspection ofthatbaytodetermine, bycalculation, thatthetotalflowpassageblockageislessthanthe15%assumedintheanalysisoflowersubcompartment pressurization following aLOCAorMSLB.Atleastonceper18monthsbyverifying, byavisualinspection, ofeachicecondenser bay,thattheaccumulation offrostoriceonthelowerinletplenumsupportstructures andtamingcanes,onthetopdeckfloorgratingandontheintermediate deck,isrmtricted toanominalthickness of3/8inches.Anaccumulation offrostandicegreaterthanthisthickness isevidenceofabnormaldegradation oftheicecondenser.
Atleastonceper40monthsbyliftingaridvisuallyinspecting theaccessible portionsofatleasttwoicebasketsfromeach1/3oftheicecondenser andverifying thattheicebasketsarefreeofdetrimental structural wear,cracks,corrosion orotherdamage.Theicebasketsshallberaisedatleast12feetforthisinspection.
COOKNUCLEARPLANT-UNIT 1Page3/46-27AMENDMENT 408,4Skp488,444p220 lW44AI'sIl 3/4BASES3/4,6CONTAINMENT SYSTEMS3/4,6.5ICE.CONDENSER Therequirements associated witheachofthecomponents oftheicecondenser ensurethattheoverallsystemwillbeavailable toprovidesufficient pressuresuppression capability tolimitthecontainment peakpressuretransient tolessthan12psigduringLOCAconditions.
3/4.6.5.1 ICEBEDTheOPERABILITY oftheicebedensuresthattherequirediceinventory will1)bedistributed evenlythroughthecontainment bays,2)containsufficient borontoprecludedilutionofthecontainment sumpfollowing theLOCAand3)containsufficient heatremovalcapability tocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditions areconsistent withtheassumptions usedintheaccidentanalyses.
Theminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservative allowance foricelossthroughsublimation.
Intheeventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions afterthreeyearsofoperation, theminimumicebasketsweightmaybeadjusteddownward.
Inaddition, thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperation ifsuchareduction issupported byobservedsublimation data.Thecontainment sub-compartment analysisassumesa15%blockagethroughout theicecondenser flowpaths.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations, andincludesthenetopenareaatthesesupportelevations.
Thisincludesthefiowarealeftbetweenthecranewallandthecoritainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatelevation, thatincludesicebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairductsandwallpanelcradlesandotherappurtenances.
Insummary,aflowchannelconsistsoftheannularareaoutsideofeachbasketandone-halfofthetriangular areasformedbythelatticesupportsbetweenbaskets,suchthatthesumoftheseareasaroundeachbasketequalsthetotalfiowareainthebay.Flowchannelsinradialrowsoneandnineincludetheareabetweenthebasketandthecontainment andcranewallrespectively.
Thereareatotalof81flowchannelsineachbay-onepericebasket.Theselection ofoneflowchanneleachfromradialrows1and9assuresthattheinspection shouldincludethoseareaswhere,basedonexperience, itisexpectedtoseefrostbuild-upfirst.The3/8"criterion forfrostoriceaccumulation inaflowchannelprovidesonlyanindicator oficecondenser condition.
Thelatticeframethickness is3/8"and,therefore, thisdimension providesaconvenient visualreference duringflowchannelinspections.
Frostoricebuild-upinexcessof3/8"shallbeevaluated furtherbyselecting arepresentative sampleof20flowchannelsthatspiraloutwardfromtheaffectedfiowchannel.Thissamplepopulation assuresthattheareasaroundandadjacenttotheblockedchannelarealsoinspected.
Morethanonerestricted flowchannelperbayrequiresa100%inspection ofthebayandcalculation toensurethatthe15%blockagelimitismet.Becausetheminimumicecondenser fiowareaineachicecondenser bayoccursatthelatticeframesupportelevations, theinspection ofthelowerinletplenumsupportstructures andturningvancs,topdeckfloorgratingandintermediate deckalsoprovidesonlyanindicator oftheoverallicecondenser condition.
The3/8"thickness criterion providesathreshold toensurethatanyfrostoricebuildupiscorrected wellbeforethe15%blockageassumption isapproached intheseareas.3/4.6.5.2 ICEBEDTEMPERATURE MONITORING SYSTEMTheOPERABILITY oftheicebedtemperature monitoring systemensuresthatthecapability isavailable formonitoring theicetemperature.
Intheeventthemonitoring systemisinoperable, theACTIONrequirements provideassurance thattheicebedheatremovalcapacitywillberetainedwithinthespecified timelimits.COOKNUCLEARPLANT-UNIT IPageB3/464AMENDMENT 480,RRO ATTACHMENT 3BTOAEP:NRC:09000PROPOSEDTECHNICAL SPECIFICATIONS PAGESREVISEDPAGESUNIT2 43/4LIMITINGCONDITIONS FOROPERATION ANDSURVEILLANCE REQUIREMENTS 3/4.6CONTAINMENT SYSTEMSSURVEILLANCE REUIREMENTS Continued shallbeconstituted ofonebasketeachfromRadialRows1,2,4,6,8and9(orfromthesamerowofanadjacentbayifabasketfromadesignated rowcannotbeobtainedforweighing) withineachbay.Ifanybasketisfoundtocontainlessthan1333poundsofice,arepresentative sampleof20additional basketsfromthesamebayshallbeweighed.Theminimumaverageweightoficefromthe20additional basketsandthediscrepant basketshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
Theicecondenser shallalsobesubdivided into3groupsofbaskets,asfollows:Group1-bays1through8,Group2-bays9through16,andGroup3-bays17through24.TheminimumaverageiceweightofthesamplebasketsfromRadialRows1,2,4,6,8and9ineachgroupshallnotbelessthan1333pounds/basket ata95%levelofconfidence.
Theminimumtotalicecondenser iceweightata95%levelofconfidence shallbecalculated usingallice'basketweightsdetermined duringthisweighingprogramandshallnotbelessthan2,590,000 pounds.Verifying, byavisualinspection ofatleastfourflowchannelspericecondenser bay,thattheaccumulation offrostoriceonflowchannelsbetweenicebasketsandpastlatticeframesisrestricted toanominalthickness of3/8inches.Flowchannelswillbeselectedasfollows:twoatrandomfromradialrows2through8andoneeachfromradialrows1and9.Ifoneflowchannelperbayisfoundtohaveanaccumulation offrostoricegreaterthanthisthickness, arepresentative sampleof20additional fiowchannelsfromthesamebayshallbevisuallyinspected.
Iftheseadditional flowchannelsarefoundacceptable, thesurveillance programmayproceedconsidering thesingledeficiency asuniqueandacceptable.
Morethanonerestricted flowchannelperbayisevidenceofabnormaldegradation andwillrequirea100%inspection ofthatbaytodetermine, bycalculation,.that thetotalflowpassageblockageislessthanthe15%assumedintheanalysisoflowersubcompartment pressurization following aLOCAorMSLB.Atleastonceper18monthsbyverifying, byavisualinspection, ofeachicecondenser bay,thattheaccumulation offrostoriceonthelowerplenumsupportstructures andturningvanes,onthetopdeckfloorgratingandontheintermediate deck,isrestricted toanominalthickness of3/8inches.Anaccumulation offrostoricegreaterthanthisthickness isevidenceofabnormaldegradation oftheicecondenser.
Atleastonceper40monthsbyliftingandvisuallyinspecting theaccessible portionsofatleasttwoicebasketsfromeach1/3oftheicecondenser andverifying thattheicebasketsarefreeofdetrimental structural wear,cracks,corrosion orotherdamage.Theicebasketsshallberaisedatleast12feetforthisinspection.
COOKNUCLEARPLANT-UNIT 2Page3/46-36AMENDMENT 90,485,%4 3/4BASES3/4.6CONTAINMENT SYSTEMS3/4:6.4COMBUSTIBLE GASCONTROLTheOPERABILITY oftheequipment andsystemsrequiredforthedetection andcontrolofhydrogengasensuresthatthisequipment willbeavailable tomaintainthehydrogenconcentration withincontainment belowitsflammable limitduringpost-LOCA conditions.
Eitherrecombiner unitiscapableofcontrolling theexpectedhydrogengeneration associated with1)zirconium-water reactions, 2)radiolytic decomposition ofwaterand3)corrosion ofmetalswithincontainment.
Thesehydrogencontrolsystemsareconsistent withtherecommendations ofRegulatory Guide1.7,"ControlofCombustible GasConcentrations inContainment Following aLOCA,"March1971.3/4.6.5ICECONDENSER Therequirements associated witheachofthecomponents oftheicecondenser ensurethattheoverallsystemwillbeavailable toprovidesufficient pressuresuppression capability tolimitthecontainment peakpressuretransient tolessthan12psigduringLOCAconditions.
3/4.6.5.1 ICEBEDTheOPERABILITY oftheicebedensuresthattherequirediceinventory will1)bedistributed evenlythroughthecontainment bays,2)containsufficient borontoprecludedilutionofthecontainment sumpfollowing theLOCAand3)containsufficient heatremovalcapability tocondensethereactorsystemvolumereleasedduringaLOCA.Theseconditions areconsistent withtheassumptions usedintheaccidentanalyses.
Theminimumweightfigureof1333poundsoficeperbasketcontainsa5%conservative allowance foricelossthroughsublimation.
Intheeventthatobservedsublimation ratesareequaltoorlowerthandesignpredictions afterthreeyearsofoperation, theminimumicebasketsweightmaybeadjusteddownward.
Inaddition, thenumberoficebasketsrequiredtobeweighedeach18monthsmaybereducedafter3yearsofoperation ifsuchareduction issupported byobservedsublimation data.Thecontainment sub~mpartmcnt analysisassumesa15%blockagethroughout theicecondenser flowpaths.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations, andincludesthenetopenareaatthesesupportelevations.
Thisincludestheflowarealeftbetweenthecranewallandthecontainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatelevation, thatincludesicebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairductsandwallpanelcradlesandotherappurtenances.
Insummary,aflowchannelconsistsoftheannularareaoutsideofeachbasketandone-halfofthetriangular areasformedbythelatticesupportsbetweenbaskets,suchthatthesumoftheseareasaroundeachbasketequalsthetotalflowareainthebay.Flowchannelsinradialrowsoneandnineincludetheareabetweenthebasketandthecontainment andcranewallrespectively.
Thereareatotalof81flowchannelsineachbay-onepericebasket.Theselection ofoneflowchanneleachfromradialrows1and9assuresthattheinspection shouldincludethoseareaswhere,basedonexperience, itisexpectedtoseefrostbuild-upfirst.The3/8"criterion forfrostoriceaccumulation inaflowchannelprovidesonlyanindicator oficecondenser condition.
Thelatticeframethickness is3/8"and,therefore, thisdimension providesaconvenient visualreference duringflowchannelinspections.
Frostoricebuild-upinexcessof3/8"shallbeevaluated furtherbyselecting arepresentative sampleof20flowchannelsthatspiraloutwardfromtheaffectedflowchannel.Thissamplepopulation assuresthattheareasaroundandadjacenttotheblockedchannelarealsoinspected.
Morethanonerestricted flowchannelperbayrequiresa100%inspection ofthebayandcalculation toensurethatthe15%blockagelimitismet.COOKNUCLEARPLANT-UNIT 2PageB3/4&4AMENDMENT 4,464,204,2%
~,~uu~'
3/4BASES3/4,6CONTAINMENT SYSTEMSBecausetheminimumicecondenser flowareaineachicecondenser bayoccursatthelatticeframesupportelevations, theinspection ofthelowerinletplenumsupportstructures andturningvanes,topdeckfloorgratingandintermediate deckalsoprovidesonlyanindicator oftheoverallicecondenser condition.
The3/8"thickness criterion providesathreshold toensurethatanyfrostoricebuildupiscorrected wellbeforethe15%blockageassumption isapproached intheseareas.3/4.6.5.2 ICEBEDTEMPERATURE MONITORING SYSTEMTheOPERABILITY oftheicebedtemperature monitoring systemensuresthatthecapability isavailable formonitoring theicetemperature.
Intheeventthemonitoring systemisinoperable, theACTIONrequirements provideassurance thattheicebedheatremovalcapacitywillberetainedwithinthespecified timelimits.COOKNUCLEARPLANT-UNIT 2PageB3/46-5AMENDMENT 4,464,204,2%
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ATTACHMENT 4TOAEP:NRC:09000 EVALUATION OFSIGNIFICANT HAZARDSCONSIDERATION Attachment 4TOAEP:NRC:09000 Page1Evaluation ofSinificantHazardsConsideration TheLicenseehasevaluated thisproposedamendment anddetermined thatitinvolvesnosignificant hazardsconsideration.
According to10CFR50.92(c),
aproposedamendment toanoperating licenseinvolvesnosignificant hazardsconsideration, ifoperation ofthefacilityinaccordance withtheproposedamendment shouldnot:1.involveasignificant increaseintheprobability ofoccurrence orconsequences ofanaccidentpreviously evaluated; 2.createthepossibility ofanewordifferent kindofaccidentfromanypreviously analyzed; or3.involveasignificant reduction inamarginofsafety.TheLicenseeproposestoreviseT/S4.6.5.1b.3 and4.6.5.1c, "IceCondenser, IceBed,"anditsassociated basesforunits1and2.Theproposedchangeswouldrevisethesurveillance foricecondenser flowchannelstoprovidereasonable assurance thatblockageofflowchannelsisdetectedandevaluated tothemaximumanalyzedblockageof15%.ThebasesarerevisedtoreflectthechangestotheT/Sandtoclarifytheintentofadditional representative samplingwhenblockedchannelsaredetected.
Thedetermination that'thecriteriasetforthin10CFR50.92aremetforthisamendment requestisindicated below.1.Doesthechangeinvolveasignificant increaseintheprobability orconsequences ofanaccidentpreviously evaluated?
Theicecondenser systemisusedtomitigatetheconsequences ofanaccidentandhasnoimpactontheinitiation ofanyevaluated accidents.
Therefore, changingtheflowchannelsurveillance doesnotincreasetheprobability ofanevaluated accident.
Theproposedchangestotheflowchannelsurveillance provideadditional assurance beyondcurrentrequirements toprovidereasonable assurance thatthemaximumanalyzedblockageof15%isnotexceeded.
Therefore, thechangedoesnotrepresent anincreaseintheconsequences ofanaccidentpreviously evaluated.
2.Doesthechangecreatethepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated?
Theproposedchangesdonotcreatethepossibility ofanewordifferent kindofaccidentfromanyaccidentpreviously evaluated.
Theicecondenser hasnofunctionduringnormaloperation.
Itisapassivesystemthatfunctions afteran Attachment 4TOAEP:NRC:09000 Page2accidenthasalreadyoccurred.
Theproposedchangetotheicecondenser flowchannelsurveillance doesnotalterphysicalcharacteristics oftheicecondenser, nordoesitchangethefunctionoftheicecondenser.
Nonewfailuremechanisms areintroduced bythischange.Therefore, itwasconcluded thattheproposedchangesdonotcreatethepossibility ofanewordifferent kindofaccidentfromanypreviously evaluated.
3.Doesthechangeinvolveasignificant reduction inamarginofsafety?Theproposedchangetotheicecondenser flowchannelsurveillance providesadditional assurance thattheicecondenser shouldcontainthe'inimum analyzedflowarea.Byensuringtheminimumanalyzedareaisalwaysavailable, inherentmarginsduetoconservative assumptions inthecalculation aremaintained.
Theseconservative assumptions include,forexample,takingnocreditforiceorfrostblockagebeingblownclearduringtheaccidentandassumingonlyonedimensional flowthroughtheicebedwithnocredittakenforcrossflow.Therefore, thesechangesdonotinvolveasignificant reduction inamarginofsafety.Insummary,basedupontheaboveevaluation, theLicenseehasconcluded thatthesechangesdonotinvolveasignificant hazardsconsideration.
4L ATTACHMENT 5TOAEP:NRC:09000ENVIRONMENTAL ASSESSMENT Attachment 5toAEP:NRC:09000 Page1Environmental Assessment TheLicenseehasevaluated thislicenseamendment requestagainstthecriteriaforidentification oflicensing andregulatory actionsrequiring environmental assessment inaccordance with10CFR51.21.TheLicenseehasdetermined thatthislicenseamendment requestmeetsthecriteriaforacategorical exclusion setforthin10CFR51.22(c)(9).
Thisdetermination isbasedonthefactthatthischangeisbeingproposedasanamendment toalicenseissuedpursuantto10CFR50thatchangesarequirement withrespecttoinstallation oruseofafacilitycomponent locatedwithintherestricted area,asdefinedin10CFR20,orthatchangesaninspection orasurveillance requirement, andtheamendment meetsthefollowing specificcriteria.
(i)Theamendment involvesnosignificant hazardsconsideration.
Asdemonstrated inattachment 4,thisproposedamendment doesnotinvolveanysignificant hazardsconsideration.
(ii)Thereisnosignificant changeinthetypesorsignificant increaseintheamountsofanyeffluentthatmaybereleasedoffsite.Asdocumented inattachment 1,therewillbenochangeinthetypesorsignificant increaseintheamountsofanyeffluents releasedoffsite.(iii)Thereisnosignificant increaseinindividual orcumulative occupational radiation exposure.
IITheproposedchangeswillnotresultinsignificant changesintheoperation orconfiguration ofthefacility.
Therewillbenochangeinthelevelofcontrolsormethodology usedforprocessing ofradioactive effluents orhandlingofsolidradioactive waste,norwilltheproposalresultinanychangeinthenormalradiation levelswithintheplant~Therefore, therewillbenoincreaseinindividual orcumulative occupational radiation exposureresulting fromthischange.
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