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{{#Wiki_filter:.~REGULA'J;ORYINFORMATIONDISTRIBUTIOSYSTEM(RIDS)ACCESSIONNBR:9812080045DOC.DATE:98/12/03NOTARIZED:YESlACIL:50-315DonaldC.CookNuclearPowerPlant,Unit1,IndianaM50-3).6DonaldC.CookNuclearPower.Plant,Unit2;IndianaMAUTHA'fAME"-AUTHORAFFILIATIONPOWERS,R.P.IndianaMichiganPowerCo.RECIP.NAMERECIPIENTAFFILIATIONRecordsManagementBranch(DocumentControlDesk)DOCKET¹0500031505000316
{{#Wiki_filter:.~REGULA'J;ORY INFORMATION DISTRIBUTIO SYSTEM(RIDS)ACCESSION NBR:9812080045 DOC.DATE:
98/12/03NOTARIZED:
YESlACIL:50-315 DonaldC.CookNuclearPowerPlant,Unit1,IndianaM50-3).6DonaldC.CookNuclearPower.Plant,Unit2;IndianaMAUTHA'fAME"-AUTHORAFFILIATION POWERS,R.P.
IndianaMichiganPowerCo.RECIP.NAME RECIPIENT AFFILIATION RecordsManagement Branch(Document ControlDesk)DOCKET¹0500031505000316


==SUBJECT:==
==SUBJECT:==
ApplicationforamendstolicensesDPR-58EDPR-74,revisingTS4.6.5.1,"IceCondensedr,IceBed"Sassociatedbasestoreflectmaxicecondenserflowchannelblockageassumedinaccidentanalyses.DISTRIBUTIONCODE:AOOIDCOPIESRECEIVED:LTRIENCLISIZE:TITLE:ORSubmittal:GeneralDistributionNOTES:RECIPIENTIDCODE/NAMEPD3-3LASTANG,JCOPIESLTTRENCL1111RECIPIENTIDCODE/NAMEPD3-3PDCOPIESLTTRENCL110INTERN.FILCENRRDE/EMCBNRR/DSSA/SPLBNUDOCS-ABSTRACTEXTERNAL:NOAC1111111111IINRR/DE/ECGB/ANRR/DRCH/HICBNRR/DSSA/SRXBOGC/HDS3NRCPDR111111101.1DNOTETOALL"RZDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTR1BUTZONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROFCOPIESREQUIRED:LTTR13ENCL12  
Application foramendstolicensesDPR-58EDPR-74,revising TS4.6.5.1,"IceCondensedr,Ice Bed"Sassociated basestoreflectmaxicecondenser flowchannelblockageassumedinaccidentanalyses.
.3IndianaMichlga~PowerCompany~500CircleDriveBuchanan,Ml491071373ÃIRONMANICHIGAMP8lfMDecember3,1998AEP:NRC:09000DocketNos.:50-31550-316U.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskMailStop0-Pl-17Washington,DC20555-0001Gentlemen:DonaldC.CookNuclearPlantUnits1and2TECHNICALSPECIFICATIONSCHANGEREQUESTICECONDENSERFLOWCHANNELSIndianaMichiganPowerCompany,theLicenseeforDonaldC.CookNuclearPlantunits1and2,proposestoamendAppendixA,technicalspecifications(T/S),'ffacilityoperatinglicensesDPR-58andDPR-74pursuantto10CFR50.90.TheLicenseeproposestoreviseT/S4.6.5.1,"IceCondenser,IceBed,"anditsassociatedbasestoreflectthemaximumicecondenserflowchannelblockageassumedin'theaccidentanalyses.Attachment1providesadetaileddescriptionandsafetyanalysisoftheproposedchanges.Attachments2Aand2BprovidemarkedupT/Spagesforunit1andunit2,respectively,Attachments3Aand3BprovidetheproposedT/Spageswiththechangesincorporatedforunit1andunit2,respectively.Attachment4describestheevaluationperformedinaccordancewith10CFR50.92(c),whichconcludesthatnosignificanthazardsconsiderationisinvolved.Attachment5providestheenvironmentalassessment.Theproposedchangeshavebeenreviewedbytheplantnuclearsafetyreviewcommitteeandbythenuclearsafetyanddesignreviewcommittee.98f208004598f203PDR,ADOCK05000815P'DR U.S.NuclearRegulatoryCommissionPage2AEP:NRC:09000CopiesofthisletteranditsattachmentsarebeingtransmittedtotheMichiganPublicServiceCommissionandMichiganDepartmentofPublicHealth,inaccordancewiththerequirementsof10CFR50.91.Sincerely,R.P.PowersVicePresidentSWORNTOANDSOBSCRIBEDBEFOREMETHIS~iDAYOF)iI/I1998NotaryPublicMyCommissionExpires/jmc~ANiCEM.BiGKERSAttachments~@8FoboBe+onCoNIQ,MMyCommissionExpiresFeb.16,2001c:J.A.Abramson,w/attachmentsJ.L.Caldwell,w/attachmentsMDEQ-DW&RPD,w/attachmentsNRCResidentInspector,w/attachmentsJ.R.Sampson,w/attachments U.S.NuclearRegulatoryCommissionPage3AEP:NRC:09000bc:T.P,Beilman,w/attachmentsJ.J.EutoB.J.HickleG.HomnaFOLIO,w/attachmentsD.F.Kunsemiller/J.BEKingseed/G.P.Arent/M.J.GumnsM.W.Rencheck/E.R.Eckstein/D.F.Powell/D.R.Hafer/K.R.BakerJ.F.Stang,Jr.,-NRCWashington,DC,w/attachments ATTACHMENT1TOAEP:NRC:09000DESCRIPTIONANDSAFETYANALYSISFORPROPOSEDCHANGES Attachment1toAEP:NRC:09000Page1DescritionandSafetAnalsisfortheProosedChanesA.SummaryofProposedChangesTheLicenseeproposestorevisetechnicalspecification(T/S)4.6.5.1.b.3and4.6.5.1.c,"IceCondenser,IceBed,"anditsassociatedbasesforDonaldC.CookNuclearPlantunits1and2.Theproposedchangewouldrevisethesurveillanceforicecondenserflowchannelstoprovideamoreconservativesamplingapproachforinitiallyassessingthepotentialforflowchannelblockageandtoimposespecificcriteriaforassessingtheextentandsignificanceofanyobservedblockagewhencomparedtothemaximumblockageallowedbyanalysis.Thiscriteriaisnotadequatelydefinedinthecurrentsurveillance.Additionally,thesurveillancewillbechangedtoutilizethetermflowchannel(viceflowpassage)tobeconsistentwithcorrespondingT/S3.6.5.1.b.Informationcurrentlylocatedin4.6.5.1.b.3,involvingareasnotconsideredtobeaflow"channel,"isrelocatedtoT/S4.6.5.1.c.Finally,thebasesarerevisedtodefineaflowchannelandthereasonforthemaximumallowableblockage.Thecurrentbasesprovidenoinformationrelatedtoflowchannelblockage.TheproposedchangesaredescribedindetailinsectionEofthisattachment.T/Spagesthataremarkedtoshowtheproposedchangesareprovidedinattachments2Aand2Bforunit1andunit2,respectively.TheproposedT/Spageswiththe'changesincorporatedareprovidedinattachments3Aand3Bforunit1andunit2,respectively.B.DescriptionoftheCurrentRequirementsT/Ssurveillancerequirement4.6.5.1.b.3requiresaninspectionevery18monthstoconfirmthatflowpassages(topdeckfloorgrating,intermediatedeckandflowpassagesbetweenicebasketsandpastlatticeframes)ineachicecondenserbayhavenotaccumulatedfrostoriceexceedinganominalthicknessof3/8ofan'inch.Thisisaccomplishedbyvisualinspectionofatleasttwoflowpassagesperbay.Exceedingthecriteriaforeitherselectedpassagerequiresvisualinspectionofanadditional20representativepassages.Morethanonerestrictedflowpassageperbayisevidenceofabnormaldegradationoftheicecondenser.Surveillancerequirement4.6.5.1.crequiresasimilarassessmentofthelowerinletplenumsupportstructuresandturningvanes.C.BasesfortheCurrentRequirementsNobasesareprovidedforthecurrentsurveillancerequirements.However,itisclearthattheapproachwasbasedontheassumptionthatfrostandicebuildupwouldbefairlyuniformthroughouteachbayoftheicecondenser.Therefore,inspectionofafewflowchannelswouldprovideagoodindicationofoverallconditionsinthatbay,constitutingthebasisforacceptanceor 0I Attachment1toAEP:NRC:09000Page2indicatingtheneedforadditionalinspection/evaluationoficecondenserconditions.Acriteriontoresolve"indicationsofabnormaldegradation"wasnotprovidedinthesurveillanceorthebases.D.NeedforRevisionoftheRequirementTheLicenseeissubmittingthisamendmenttoT/Ssurveillance4.6.5'.b.3and4.6.5.1.c,to:i.addressthepotentialfornon-uniformaccumulationoffrost/icewithintheicecondensersbyincreasingthesamplesizetoselectivelyincludeareaswhereoperatingexperiencehasshownincreasedaccumulation;ii.provideaspecificnumericalacceptancecriteria(basedonanalysis)forassessing"indicationsofabnormaldegradation"inflowchannels;iii.clarifythetermflow"channel"andconsistentlyutilizeitinsurveillance4.6.5.1.b.3.becausethistermisusedinthecorrespondingT/SLCO3.6.5.1b;andiv.removefromT/S4.6.5.1.b.3.thediscussionoficecondenserareasnotcomprisingflowchannels(asutilizedintheanalysisofii.above)andconsolidatetheseareasunderT/S4.6.5.1.cwheresimilarareasareincluded;E.DescriptionoftheProposedChangesTheLicenseeproposestoreviseT/Ssurveillance4.6.5.1.b.3to:i.requireanincreaseinthesurveillancesamplesizefromthecurrent2flowchannelspericecondenserbayto4flowchannelsperbay.Theadditionaltwoflowchannelsinspectedarespecifiedtoincludeoneinradialrows1(adjacenttothecontainmentwall)andoneinradialrow9(adjacenttothecranewall);ii.inthecaseofdiscoveringmorethanonerestrictedflowchannelpericecondenserbay,requirea100%inspectionofthebaytodeterminethatthebayislessthan15%blocked;andiii.(andiv.)consistentlyutilizethetermflow"channel"inlieuofflow"passage"tomaintainconsistencywithcorrespondingT/SLCO3.6.5.1b.Themeaningofthetermflowchannelisclarifiedbyremovingmentionofthetopdeckfloorgratingareaandtheintermediatedeckarea.ThesetwoareasarerelocatedtoT/S4.6.5.1.cwhereotherareasimportanttoicecondenserperformanceareincluded.TheLicenseeproposestoincludeappropriatebasesforT/S4.6.5.1.b.3and4.6.5.1.cconsistentwiththechangesdescribedini,ii,iii,andivabove.Thebasesshouldalsoclarifytheintentof"representative"sampleof20additionalflowchannelsasutilizedintheT/S.  
DISTRIBUTION CODE:AOOIDCOPIESRECEIVED:LTR IENCLISIZE:TITLE:ORSubmittal:
GeneralDistribution NOTES:RECIPIENT IDCODE/NAME PD3-3LASTANG,JCOPIESLTTRENCL1111RECIPIENT IDCODE/NAME PD3-3PDCOPIESLTTRENCL110INTERN.FILCENRRDE/EMCBNRR/DSSA/SPLB NUDOCS-ABSTRACT EXTERNAL:
NOAC1111111111IINRR/DE/ECGB/A NRR/DRCH/HICB NRR/DSSA/SRXB OGC/HDS3NRCPDR111111101.1DNOTETOALL"RZDS"RECIPIENTS:
PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTR1BUTZON LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083TOTALNUMBEROFCOPIESREQUIRED:
LTTR13ENCL12  
.3IndianaMichlga~PowerCompany~500CircleDriveBuchanan, Ml491071373
ÃIRONMANICHIGAMP8lfMDecember3,1998AEP:NRC:09000DocketNos.:50-31550-316U.S.NuclearRegulatory Commission ATTN:DocumentControlDeskMailStop0-Pl-17Washington, DC20555-0001 Gentlemen:
DonaldC.CookNuclearPlantUnits1and2TECHNICAL SPECIFICATIONS CHANGEREQUESTICECONDENSER FLOWCHANNELSIndianaMichiganPowerCompany,theLicenseeforDonaldC.CookNuclearPlantunits1and2,proposestoamendAppendixA,technical specifications (T/S),'ffacilityoperating licensesDPR-58andDPR-74pursuantto10CFR50.90.TheLicenseeproposestoreviseT/S4.6.5.1,"IceCondenser, IceBed,"anditsassociated basestoreflectthemaximumicecondenser flowchannelblockageassumedin'theaccidentanalyses.
Attachment 1providesadetaileddescription andsafetyanalysisoftheproposedchanges.Attachments 2Aand2BprovidemarkedupT/Spagesforunit1andunit2,respectively, Attachments 3Aand3BprovidetheproposedT/Spageswiththechangesincorporated forunit1andunit2,respectively.
Attachment 4describes theevaluation performed inaccordance with10CFR50.92(c),
whichconcludes thatnosignificant hazardsconsideration isinvolved.
Attachment 5providestheenvironmental assessment.
Theproposedchangeshavebeenreviewedbytheplantnuclearsafetyreviewcommittee andbythenuclearsafetyanddesignreviewcommittee.
98f2080045 98f203PDR,ADOCK05000815P'DR U.S.NuclearRegulatory Commission Page2AEP:NRC:09000Copiesofthisletteranditsattachments arebeingtransmitted totheMichiganPublicServiceCommission andMichiganDepartment ofPublicHealth,inaccordance withtherequirements of10CFR50.91.Sincerely, R.P.PowersVicePresident SWORNTOANDSOBSCRIBED BEFOREMETHIS~iDAYOF)iI/I1998NotaryPublicMyCommission Expires/jmc~ANiCEM.BiGKERSAttachments
~@8FoboBe+onCoNIQ,MMyCommission ExpiresFeb.16,2001c:J.A.Abramson, w/attachments J.L.Caldwell, w/attachments MDEQ-DW&RPD,w/attachments NRCResidentInspector, w/attachments J.R.Sampson,w/attachments U.S.NuclearRegulatory Commission Page3AEP:NRC:09000bc:T.P,Beilman,w/attachments J.J.EutoB.J.HickleG.HomnaFOLIO,w/attachments D.F.Kunsemiller/J.
BEKingseed/G.
P.Arent/M.J.GumnsM.W.Rencheck/E.
R.Eckstein/D.
F.Powell/D.
R.Hafer/K.R.BakerJ.F.Stang,Jr.,-NRCWashington, DC,w/attachments ATTACHMENT 1TOAEP:NRC:09000DESCRIPTION ANDSAFETYANALYSISFORPROPOSEDCHANGES Attachment 1toAEP:NRC:09000Page1DescritionandSafetAnalsisfortheProosedChanesA.SummaryofProposedChangesTheLicenseeproposestorevisetechnical specification (T/S)4.6.5.1.b.3 and4.6.5.1.c, "IceCondenser, IceBed,"anditsassociated basesforDonaldC.CookNuclearPlantunits1and2.Theproposedchangewouldrevisethesurveillance foricecondenser flowchannelstoprovideamoreconservative samplingapproachforinitially assessing thepotential forflowchannelblockageandtoimposespecificcriteriaforassessing theextentandsignificance ofanyobservedblockagewhencomparedtothemaximumblockageallowedbyanalysis.
Thiscriteriaisnotadequately definedinthecurrentsurveillance.
Additionally, thesurveillance willbechangedtoutilizethetermflowchannel(viceflowpassage)tobeconsistent withcorresponding T/S3.6.5.1.b.
Information currently locatedin4.6.5.1.b.3, involving areasnotconsidered tobeaflow"channel,"
isrelocated toT/S4.6.5.1.c.
Finally,thebasesarerevisedtodefineaflowchannelandthereasonforthemaximumallowable blockage.
Thecurrentbasesprovidenoinformation relatedtoflowchannelblockage.
Theproposedchangesaredescribed indetailinsectionEofthisattachment.
T/Spagesthataremarkedtoshowtheproposedchangesareprovidedinattachments 2Aand2Bforunit1andunit2,respectively.
TheproposedT/Spageswiththe'changesincorporated areprovidedinattachments 3Aand3Bforunit1andunit2,respectively.
B.Description oftheCurrentRequirements T/Ssurveillance requirement 4.6.5.1.b.3 requiresaninspection every18monthstoconfirmthatflowpassages(topdeckfloorgrating,intermediate deckandflowpassagesbetweenicebasketsandpastlatticeframes)ineachicecondenser bayhavenotaccumulated frostoriceexceeding anominalthickness of3/8ofan'inch.Thisisaccomplished byvisualinspection ofatleasttwoflowpassagesperbay.Exceeding thecriteriaforeitherselectedpassagerequiresvisualinspection ofanadditional 20representative passages.
Morethanonerestricted flowpassageperbayisevidenceofabnormaldegradation oftheicecondenser.
Surveillance requirement 4.6.5.1.c requiresasimilarassessment ofthelowerinletplenumsupportstructures andturningvanes.C.BasesfortheCurrentRequirements Nobasesareprovidedforthecurrentsurveillance requirements.
However,itisclearthattheapproachwasbasedontheassumption thatfrostandicebuildupwouldbefairlyuniformthroughout eachbayoftheicecondenser.
Therefore, inspection ofafewflowchannelswouldprovideagoodindication ofoverallconditions inthatbay,constituting thebasisforacceptance or 0I Attachment 1toAEP:NRC:09000Page2indicating theneedforadditional inspection/evaluation oficecondenser conditions.
Acriterion toresolve"indications ofabnormaldegradation" wasnotprovidedinthesurveillance orthebases.D.NeedforRevisionoftheRequirement TheLicenseeissubmitting thisamendment toT/Ssurveillance 4.6.5'.b.3and4.6.5.1.c, to:i.addressthepotential fornon-uniform accumulation offrost/ice withintheicecondensers byincreasing thesamplesizetoselectively includeareaswhereoperating experience hasshownincreased accumulation; ii.provideaspecificnumerical acceptance criteria(basedonanalysis) forassessing "indications ofabnormaldegradation" inflowchannels; iii.clarifythetermflow"channel" andconsistently utilizeitinsurveillance 4.6.5.1.b.3.
becausethistermisusedinthecorresponding T/SLCO3.6.5.1b; andiv.removefromT/S4.6.5.1.b.3.
thediscussion oficecondenser areasnotcomprising flowchannels(asutilizedintheanalysisofii.above)andconsolidate theseareasunderT/S4.6.5.1.c wheresimilarareasareincluded; E.Description oftheProposedChangesTheLicenseeproposestoreviseT/Ssurveillance 4.6.5.1.b.3 to:i.requireanincreaseinthesurveillance samplesizefromthecurrent2flowchannelspericecondenser bayto4flowchannelsperbay.Theadditional twoflowchannelsinspected arespecified toincludeoneinradialrows1(adjacent tothecontainment wall)andoneinradialrow9(adjacent tothecranewall);ii.inthecaseofdiscovering morethanonerestricted flowchannelpericecondenser bay,requirea100%inspection ofthebaytodetermine thatthebayislessthan15%blocked;andiii.(andiv.)consistently utilizethetermflow"channel" inlieuofflow"passage" tomaintainconsistency withcorresponding T/SLCO3.6.5.1b.
Themeaningofthetermflowchannelisclarified byremovingmentionofthetopdeckfloorgratingareaandtheintermediate deckarea.Thesetwoareasarerelocated toT/S4.6.5.1.cwhereotherareasimportant toicecondenser performance areincluded.
TheLicenseeproposestoincludeappropriate basesforT/S4.6.5.1.b.3 and4.6.5.1.c consistent withthechangesdescribed ini,ii,iii,andivabove.Thebasesshouldalsoclarifytheintentof"representative" sampleof20additional flowchannelsasutilizedintheT/S.  


Attachment1toAEP:NRC:09000Page3F.BasesoftheProposedChangesInJanuary1998,adetailedinspectionandmappingoftheaccumulationoffrostandiceintheunit1andunit2icecondenserflowchannelswasperformed.Theinspectionshowedthattheflowchannelsineachicecondenserbayassociatedwithicebasketsinradialrows1(adjacenttothecontainmentwall)andradialrow9(adjacenttothecranewall)hadthemostaccumulationsoffrostandice.Evaluationoftheinspectionresultsattributedtheconditiontoaslighttemperaturegradientintheicecondensersresultingfromthegenerallywarmercranewallandthecoolercontainmentwall.Thisgradienthasbeenattributedtocausingtheincreasedsublimationratesobservedforiceinrow9baskets.Someofthemasslostduetosublimationinrow9isbelievedtomigratetocoolerregionsoftheicecondenserandshowsupinrow1asincreasedfrosting.Duetothehighersublimationratesinrow9,thesebasketshavemostfrequentlybeensubjectedtoiceadditionactivities.Iceadditionstothebasketscanresultinicespillageintotheadjacentflowchannels.Thisicethenbecomesapotentialnucleationsiteforfrostgrowthandaccumulation.Theicecondensermappingshowedthatfrostandiceaccumulationfrequentlyinvolvesrelativelylocalizedareasattributedtothenucleationandgrowthmechanism.Duetothismechanism,theflowchannelsinradialrows1and9aregenerallynotrepresentativeoftheotherflowchannelsinrows2through8.Toprovidereasonableassurancethatrows1and9areproperlyassessedduringicechannelsurveillanceactivities,thespecificationisbeingchangedtorequire1additionalsamplefromeachradialrow1andradialrow9ineachbay.Thishastheeffectofbiasingthesampleinaconservativedirectionthatshouldtendtopromotesampleexpansionandadditionalevaluationutilizingthe15%blockagecriteriawhenwarranted.Thenucleationandgrowthmechanismisalsothereasonthatexpansionofsamplingduetodiscoveryofobstructedchannelsisspecifiedtobeperformedintheareathattheobstructionwasfound.Thisisconsideredmorerepresentativeandconservativethanrandomlyexpandingthesampletoareasnotadjacenttotheareaoftheobservedobstruction.AsdescribedinChapter14.3.4,ContainmentIntegrityAnalysisoftheCookNuclearPlantUpdatedFinalSafetyAnalysisReport(UFSAR),aTransientMassDistribution(TMD)computercodewasutilizedforthesub-compartmentanalysisoftheunit1andunit2containments.Theanalysiswasperformedassumingatotalblockageofupto15%oftheflowareasthroughtheicecondensers.Theanalysiswasapplicabletobothunit1andunit2andassessedtheeffectsofthe15%icecondenserflowblockageonthepeakdifferentialpressureactingacrosstheoperatingdeck,thecranewall,andthecontainmentshell.Theanalysismodelsthelowercompartmentas6elementsandtheicecondenserismodeledwith6sections.Theanalysisdoesnotperformdetailedflowchannelanalysis,buttheTMDanalysislumpstheicecondenserbayswithasfewas2.75baystogether.The15%flowblockageanalysisassumedauniformiceblockagethroughouttheicecondenserflowpaths.ThebasisfortheTMDflowareas Attachment1toAEP:NRC:09000Page4includestheareasbetweentheendsofthelatticeframesandthewallpanelairductsonboththecranewallandthecontainmentwallsides.Theminimumicecondenserflowareathrougheachbayoccursatthelatticeframesupportelevationsandistakentobethenetopenareaatthesesupportelevations.Thisincludesthenetopenarealeftbetweenthecranewallandthecontainmentwallinsidesurfaces,aftersubtractingouttheareasfortheicecondenserequipmentatthatelevation,thatincludes:icebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairducts,wallpanelcradles,andotherappurtenances.Thisisconservative,astheminimumareawouldbeatthelatticeframeelevation,andtheflowareaselsewherewouldbelarger.Theblockagewasassumedtobepermanent,i.e.,nocreditwastakenforthehighenergyflowofairandsteamenteringtheicecondensertoblowoutormeltaccumulationsoffrostorice.Additionally,theonedimensionalflowmodelofthecurrentTMDcodedoesnotconsiderthebeneficialeffectsofcross-flowwithintheicecondenser.G.Impactof0heProposedChangesTheproposedchangesarerequiredtosupportstartupofunit1.Theicecondenserisrequiredtobeoperablepriortoenteringmode4.Ifthechangeisnotapproved,themodechangecannotbemade.ThissubmittalaffectssomeofthesamepagesassubmittalsAEP:NRC:1319andAEP:NRC:1291.AEP:NRC:1319involvesproposedchangestotheicecondensericeweightT/SandAEP:NRC:1291,involvingthedistributedignitionsystem,providesnewbasespagesthataffectthesamepagesasthissubmittal'heT/Spagesinattachments2A,2B,3A,and3Bdonotreflectthechangesproposedintheothersubmittals.Changeswillbeincorporatedbasedonwheneachrequestisapproved.H.ScheduleRequirementsTheLicenseerequestsapprovalofthisrequestbyJanuary20,1999,tomeetthestartupschedule.}}
Attachment 1toAEP:NRC:09000Page3F.BasesoftheProposedChangesInJanuary1998,adetailedinspection andmappingoftheaccumulation offrostandiceintheunit1andunit2icecondenser flowchannelswasperformed.
Theinspection showedthattheflowchannelsineachicecondenser bayassociated withicebasketsinradialrows1(adjacent tothecontainment wall)andradialrow9(adjacent tothecranewall)hadthemostaccumulations offrostandice.Evaluation oftheinspection resultsattributed thecondition toaslighttemperature gradientintheicecondensers resulting fromthegenerally warmercranewallandthecoolercontainment wall.Thisgradienthasbeenattributed tocausingtheincreased sublimation ratesobservedforiceinrow9baskets.Someofthemasslostduetosublimation inrow9isbelievedtomigratetocoolerregionsoftheicecondenser andshowsupinrow1asincreased frosting.
Duetothehighersublimation ratesinrow9,thesebasketshavemostfrequently beensubjected toiceadditionactivities.
Iceadditions tothebasketscanresultinicespillageintotheadjacentflowchannels.
Thisicethenbecomesapotential nucleation siteforfrostgrowthandaccumulation.
Theicecondenser mappingshowedthatfrostandiceaccumulation frequently involvesrelatively localized areasattributed tothenucleation andgrowthmechanism.
Duetothismechanism, theflowchannelsinradialrows1and9aregenerally notrepresentative oftheotherflowchannelsinrows2through8.Toprovidereasonable assurance thatrows1and9areproperlyassessedduringicechannelsurveillance activities, thespecification isbeingchangedtorequire1additional samplefromeachradialrow1andradialrow9ineachbay.Thishastheeffectofbiasingthesampleinaconservative direction thatshouldtendtopromotesampleexpansion andadditional evaluation utilizing the15%blockagecriteriawhenwarranted.
Thenucleation andgrowthmechanism isalsothereasonthatexpansion ofsamplingduetodiscovery ofobstructed channelsisspecified tobeperformed intheareathattheobstruction wasfound.Thisisconsidered morerepresentative andconservative thanrandomlyexpanding thesampletoareasnotadjacenttotheareaoftheobservedobstruction.
Asdescribed inChapter14.3.4,Containment Integrity AnalysisoftheCookNuclearPlantUpdatedFinalSafetyAnalysisReport(UFSAR),aTransient MassDistribution (TMD)computercodewasutilizedforthesub-compartment analysisoftheunit1andunit2containments.
Theanalysiswasperformed assumingatotalblockageofupto15%oftheflowareasthroughtheicecondensers.
Theanalysiswasapplicable tobothunit1andunit2andassessedtheeffectsofthe15%icecondenser flowblockageonthepeakdifferential pressureactingacrosstheoperating deck,thecranewall,andthecontainment shell.Theanalysismodelsthelowercompartment as6elementsandtheicecondenser ismodeledwith6sections.
Theanalysisdoesnotperformdetailedflowchannelanalysis, buttheTMDanalysislumpstheicecondenser bayswithasfewas2.75baystogether.
The15%flowblockageanalysisassumedauniformiceblockagethroughout theicecondenser flowpaths.ThebasisfortheTMDflowareas Attachment 1toAEP:NRC:09000Page4includestheareasbetweentheendsofthelatticeframesandthewallpanelairductsonboththecranewallandthecontainment wallsides.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations andistakentobethenetopenareaatthesesupportelevations.
Thisincludesthenetopenarealeftbetweenthecranewallandthecontainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatelevation, thatincludes:
icebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairducts,wallpanelcradles,andotherappurtenances.
Thisisconservative, astheminimumareawouldbeatthelatticeframeelevation, andtheflowareaselsewhere wouldbelarger.Theblockagewasassumedtobepermanent, i.e.,nocreditwastakenforthehighenergyflowofairandsteamenteringtheicecondenser toblowoutormeltaccumulations offrostorice.Additionally, theonedimensional flowmodelofthecurrentTMDcodedoesnotconsiderthebeneficial effectsofcross-flow withintheicecondenser.
G.Impactof0heProposedChangesTheproposedchangesarerequiredtosupportstartupofunit1.Theicecondenser isrequiredtobeoperablepriortoenteringmode4.Ifthechangeisnotapproved, themodechangecannotbemade.Thissubmittal affectssomeofthesamepagesassubmittals AEP:NRC:1319 andAEP:NRC:1291.
AEP:NRC:1319 involvesproposedchangestotheicecondenser iceweightT/SandAEP:NRC:1291, involving thedistributed ignitionsystem,providesnewbasespagesthataffectthesamepagesasthissubmittal'he T/Spagesinattachments 2A,2B,3A,and3Bdonotreflectthechangesproposedintheothersubmittals.
Changeswillbeincorporated basedonwheneachrequestisapproved.
H.ScheduleRequirements TheLicenseerequestsapprovalofthisrequestbyJanuary20,1999,tomeetthestartupschedule.}}

Revision as of 06:08, 29 June 2018

Application for Amends to Licenses DPR-58 & DPR-74,revising TS 4.6.5.1, Ice Condenser,Ice Bed & Associated Bases to Reflect Max Ice Condenser Flow Channel Blockage Assumed in Accident Analyses
ML17335A356
Person / Time
Site: Cook  American Electric Power icon.png
Issue date: 12/03/1998
From: POWERS R P
INDIANA MICHIGAN POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17335A357 List:
References
AEP:NRC:09000, AEP:NRC:9000, NUDOCS 9812080045
Download: ML17335A356 (12)
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Text

.~REGULA'J;ORY INFORMATION DISTRIBUTIO SYSTEM(RIDS)ACCESSION NBR:9812080045 DOC.DATE:

98/12/03NOTARIZED:

YESlACIL:50-315 DonaldC.CookNuclearPowerPlant,Unit1,IndianaM50-3).6DonaldC.CookNuclearPower.Plant,Unit2;IndianaMAUTHA'fAME"-AUTHORAFFILIATION POWERS,R.P.

IndianaMichiganPowerCo.RECIP.NAME RECIPIENT AFFILIATION RecordsManagement Branch(Document ControlDesk)DOCKET¹0500031505000316

SUBJECT:

Application foramendstolicensesDPR-58EDPR-74,revising TS4.6.5.1,"IceCondensedr,Ice Bed"Sassociated basestoreflectmaxicecondenser flowchannelblockageassumedinaccidentanalyses.

DISTRIBUTION CODE:AOOIDCOPIESRECEIVED:LTR IENCLISIZE:TITLE:ORSubmittal:

GeneralDistribution NOTES:RECIPIENT IDCODE/NAME PD3-3LASTANG,JCOPIESLTTRENCL1111RECIPIENT IDCODE/NAME PD3-3PDCOPIESLTTRENCL110INTERN.FILCENRRDE/EMCBNRR/DSSA/SPLB NUDOCS-ABSTRACT EXTERNAL:

NOAC1111111111IINRR/DE/ECGB/A NRR/DRCH/HICB NRR/DSSA/SRXB OGC/HDS3NRCPDR111111101.1DNOTETOALL"RZDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTR1BUTZON LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083TOTALNUMBEROFCOPIESREQUIRED:

LTTR13ENCL12

.3IndianaMichlga~PowerCompany~500CircleDriveBuchanan, Ml491071373

ÃIRONMANICHIGAMP8lfMDecember3,1998AEP:NRC:09000DocketNos.:50-31550-316U.S.NuclearRegulatory Commission ATTN:DocumentControlDeskMailStop0-Pl-17Washington, DC20555-0001 Gentlemen:

DonaldC.CookNuclearPlantUnits1and2TECHNICAL SPECIFICATIONS CHANGEREQUESTICECONDENSER FLOWCHANNELSIndianaMichiganPowerCompany,theLicenseeforDonaldC.CookNuclearPlantunits1and2,proposestoamendAppendixA,technical specifications (T/S),'ffacilityoperating licensesDPR-58andDPR-74pursuantto10CFR50.90.TheLicenseeproposestoreviseT/S4.6.5.1,"IceCondenser, IceBed,"anditsassociated basestoreflectthemaximumicecondenser flowchannelblockageassumedin'theaccidentanalyses.

Attachment 1providesadetaileddescription andsafetyanalysisoftheproposedchanges.Attachments 2Aand2BprovidemarkedupT/Spagesforunit1andunit2,respectively, Attachments 3Aand3BprovidetheproposedT/Spageswiththechangesincorporated forunit1andunit2,respectively.

Attachment 4describes theevaluation performed inaccordance with10CFR50.92(c),

whichconcludes thatnosignificant hazardsconsideration isinvolved.

Attachment 5providestheenvironmental assessment.

Theproposedchangeshavebeenreviewedbytheplantnuclearsafetyreviewcommittee andbythenuclearsafetyanddesignreviewcommittee.

98f2080045 98f203PDR,ADOCK05000815P'DR U.S.NuclearRegulatory Commission Page2AEP:NRC:09000Copiesofthisletteranditsattachments arebeingtransmitted totheMichiganPublicServiceCommission andMichiganDepartment ofPublicHealth,inaccordance withtherequirements of10CFR50.91.Sincerely, R.P.PowersVicePresident SWORNTOANDSOBSCRIBED BEFOREMETHIS~iDAYOF)iI/I1998NotaryPublicMyCommission Expires/jmc~ANiCEM.BiGKERSAttachments

~@8FoboBe+onCoNIQ,MMyCommission ExpiresFeb.16,2001c:J.A.Abramson, w/attachments J.L.Caldwell, w/attachments MDEQ-DW&RPD,w/attachments NRCResidentInspector, w/attachments J.R.Sampson,w/attachments U.S.NuclearRegulatory Commission Page3AEP:NRC:09000bc:T.P,Beilman,w/attachments J.J.EutoB.J.HickleG.HomnaFOLIO,w/attachments D.F.Kunsemiller/J.

BEKingseed/G.

P.Arent/M.J.GumnsM.W.Rencheck/E.

R.Eckstein/D.

F.Powell/D.

R.Hafer/K.R.BakerJ.F.Stang,Jr.,-NRCWashington, DC,w/attachments ATTACHMENT 1TOAEP:NRC:09000DESCRIPTION ANDSAFETYANALYSISFORPROPOSEDCHANGES Attachment 1toAEP:NRC:09000Page1DescritionandSafetAnalsisfortheProosedChanesA.SummaryofProposedChangesTheLicenseeproposestorevisetechnical specification (T/S)4.6.5.1.b.3 and4.6.5.1.c, "IceCondenser, IceBed,"anditsassociated basesforDonaldC.CookNuclearPlantunits1and2.Theproposedchangewouldrevisethesurveillance foricecondenser flowchannelstoprovideamoreconservative samplingapproachforinitially assessing thepotential forflowchannelblockageandtoimposespecificcriteriaforassessing theextentandsignificance ofanyobservedblockagewhencomparedtothemaximumblockageallowedbyanalysis.

Thiscriteriaisnotadequately definedinthecurrentsurveillance.

Additionally, thesurveillance willbechangedtoutilizethetermflowchannel(viceflowpassage)tobeconsistent withcorresponding T/S3.6.5.1.b.

Information currently locatedin4.6.5.1.b.3, involving areasnotconsidered tobeaflow"channel,"

isrelocated toT/S4.6.5.1.c.

Finally,thebasesarerevisedtodefineaflowchannelandthereasonforthemaximumallowable blockage.

Thecurrentbasesprovidenoinformation relatedtoflowchannelblockage.

Theproposedchangesaredescribed indetailinsectionEofthisattachment.

T/Spagesthataremarkedtoshowtheproposedchangesareprovidedinattachments 2Aand2Bforunit1andunit2,respectively.

TheproposedT/Spageswiththe'changesincorporated areprovidedinattachments 3Aand3Bforunit1andunit2,respectively.

B.Description oftheCurrentRequirements T/Ssurveillance requirement 4.6.5.1.b.3 requiresaninspection every18monthstoconfirmthatflowpassages(topdeckfloorgrating,intermediate deckandflowpassagesbetweenicebasketsandpastlatticeframes)ineachicecondenser bayhavenotaccumulated frostoriceexceeding anominalthickness of3/8ofan'inch.Thisisaccomplished byvisualinspection ofatleasttwoflowpassagesperbay.Exceeding thecriteriaforeitherselectedpassagerequiresvisualinspection ofanadditional 20representative passages.

Morethanonerestricted flowpassageperbayisevidenceofabnormaldegradation oftheicecondenser.

Surveillance requirement 4.6.5.1.c requiresasimilarassessment ofthelowerinletplenumsupportstructures andturningvanes.C.BasesfortheCurrentRequirements Nobasesareprovidedforthecurrentsurveillance requirements.

However,itisclearthattheapproachwasbasedontheassumption thatfrostandicebuildupwouldbefairlyuniformthroughout eachbayoftheicecondenser.

Therefore, inspection ofafewflowchannelswouldprovideagoodindication ofoverallconditions inthatbay,constituting thebasisforacceptance or 0I Attachment 1toAEP:NRC:09000Page2indicating theneedforadditional inspection/evaluation oficecondenser conditions.

Acriterion toresolve"indications ofabnormaldegradation" wasnotprovidedinthesurveillance orthebases.D.NeedforRevisionoftheRequirement TheLicenseeissubmitting thisamendment toT/Ssurveillance 4.6.5'.b.3and4.6.5.1.c, to:i.addressthepotential fornon-uniform accumulation offrost/ice withintheicecondensers byincreasing thesamplesizetoselectively includeareaswhereoperating experience hasshownincreased accumulation; ii.provideaspecificnumerical acceptance criteria(basedonanalysis) forassessing "indications ofabnormaldegradation" inflowchannels; iii.clarifythetermflow"channel" andconsistently utilizeitinsurveillance 4.6.5.1.b.3.

becausethistermisusedinthecorresponding T/SLCO3.6.5.1b; andiv.removefromT/S4.6.5.1.b.3.

thediscussion oficecondenser areasnotcomprising flowchannels(asutilizedintheanalysisofii.above)andconsolidate theseareasunderT/S4.6.5.1.c wheresimilarareasareincluded; E.Description oftheProposedChangesTheLicenseeproposestoreviseT/Ssurveillance 4.6.5.1.b.3 to:i.requireanincreaseinthesurveillance samplesizefromthecurrent2flowchannelspericecondenser bayto4flowchannelsperbay.Theadditional twoflowchannelsinspected arespecified toincludeoneinradialrows1(adjacent tothecontainment wall)andoneinradialrow9(adjacent tothecranewall);ii.inthecaseofdiscovering morethanonerestricted flowchannelpericecondenser bay,requirea100%inspection ofthebaytodetermine thatthebayislessthan15%blocked;andiii.(andiv.)consistently utilizethetermflow"channel" inlieuofflow"passage" tomaintainconsistency withcorresponding T/SLCO3.6.5.1b.

Themeaningofthetermflowchannelisclarified byremovingmentionofthetopdeckfloorgratingareaandtheintermediate deckarea.Thesetwoareasarerelocated toT/S4.6.5.1.cwhereotherareasimportant toicecondenser performance areincluded.

TheLicenseeproposestoincludeappropriate basesforT/S4.6.5.1.b.3 and4.6.5.1.c consistent withthechangesdescribed ini,ii,iii,andivabove.Thebasesshouldalsoclarifytheintentof"representative" sampleof20additional flowchannelsasutilizedintheT/S.

Attachment 1toAEP:NRC:09000Page3F.BasesoftheProposedChangesInJanuary1998,adetailedinspection andmappingoftheaccumulation offrostandiceintheunit1andunit2icecondenser flowchannelswasperformed.

Theinspection showedthattheflowchannelsineachicecondenser bayassociated withicebasketsinradialrows1(adjacent tothecontainment wall)andradialrow9(adjacent tothecranewall)hadthemostaccumulations offrostandice.Evaluation oftheinspection resultsattributed thecondition toaslighttemperature gradientintheicecondensers resulting fromthegenerally warmercranewallandthecoolercontainment wall.Thisgradienthasbeenattributed tocausingtheincreased sublimation ratesobservedforiceinrow9baskets.Someofthemasslostduetosublimation inrow9isbelievedtomigratetocoolerregionsoftheicecondenser andshowsupinrow1asincreased frosting.

Duetothehighersublimation ratesinrow9,thesebasketshavemostfrequently beensubjected toiceadditionactivities.

Iceadditions tothebasketscanresultinicespillageintotheadjacentflowchannels.

Thisicethenbecomesapotential nucleation siteforfrostgrowthandaccumulation.

Theicecondenser mappingshowedthatfrostandiceaccumulation frequently involvesrelatively localized areasattributed tothenucleation andgrowthmechanism.

Duetothismechanism, theflowchannelsinradialrows1and9aregenerally notrepresentative oftheotherflowchannelsinrows2through8.Toprovidereasonable assurance thatrows1and9areproperlyassessedduringicechannelsurveillance activities, thespecification isbeingchangedtorequire1additional samplefromeachradialrow1andradialrow9ineachbay.Thishastheeffectofbiasingthesampleinaconservative direction thatshouldtendtopromotesampleexpansion andadditional evaluation utilizing the15%blockagecriteriawhenwarranted.

Thenucleation andgrowthmechanism isalsothereasonthatexpansion ofsamplingduetodiscovery ofobstructed channelsisspecified tobeperformed intheareathattheobstruction wasfound.Thisisconsidered morerepresentative andconservative thanrandomlyexpanding thesampletoareasnotadjacenttotheareaoftheobservedobstruction.

Asdescribed inChapter14.3.4,Containment Integrity AnalysisoftheCookNuclearPlantUpdatedFinalSafetyAnalysisReport(UFSAR),aTransient MassDistribution (TMD)computercodewasutilizedforthesub-compartment analysisoftheunit1andunit2containments.

Theanalysiswasperformed assumingatotalblockageofupto15%oftheflowareasthroughtheicecondensers.

Theanalysiswasapplicable tobothunit1andunit2andassessedtheeffectsofthe15%icecondenser flowblockageonthepeakdifferential pressureactingacrosstheoperating deck,thecranewall,andthecontainment shell.Theanalysismodelsthelowercompartment as6elementsandtheicecondenser ismodeledwith6sections.

Theanalysisdoesnotperformdetailedflowchannelanalysis, buttheTMDanalysislumpstheicecondenser bayswithasfewas2.75baystogether.

The15%flowblockageanalysisassumedauniformiceblockagethroughout theicecondenser flowpaths.ThebasisfortheTMDflowareas Attachment 1toAEP:NRC:09000Page4includestheareasbetweentheendsofthelatticeframesandthewallpanelairductsonboththecranewallandthecontainment wallsides.Theminimumicecondenser flowareathrougheachbayoccursatthelatticeframesupportelevations andistakentobethenetopenareaatthesesupportelevations.

Thisincludesthenetopenarealeftbetweenthecranewallandthecontainment wallinsidesurfaces, aftersubtracting outtheareasfortheicecondenser equipment atthatelevation, thatincludes:

icebasketsfullofice,latticeframe,latticeframecolumns,wallpanelairducts,wallpanelcradles,andotherappurtenances.

Thisisconservative, astheminimumareawouldbeatthelatticeframeelevation, andtheflowareaselsewhere wouldbelarger.Theblockagewasassumedtobepermanent, i.e.,nocreditwastakenforthehighenergyflowofairandsteamenteringtheicecondenser toblowoutormeltaccumulations offrostorice.Additionally, theonedimensional flowmodelofthecurrentTMDcodedoesnotconsiderthebeneficial effectsofcross-flow withintheicecondenser.

G.Impactof0heProposedChangesTheproposedchangesarerequiredtosupportstartupofunit1.Theicecondenser isrequiredtobeoperablepriortoenteringmode4.Ifthechangeisnotapproved, themodechangecannotbemade.Thissubmittal affectssomeofthesamepagesassubmittals AEP:NRC:1319 andAEP:NRC:1291.

AEP:NRC:1319 involvesproposedchangestotheicecondenser iceweightT/SandAEP:NRC:1291, involving thedistributed ignitionsystem,providesnewbasespagesthataffectthesamepagesasthissubmittal'he T/Spagesinattachments 2A,2B,3A,and3Bdonotreflectthechangesproposedintheothersubmittals.

Changeswillbeincorporated basedonwheneachrequestisapproved.

H.ScheduleRequirements TheLicenseerequestsapprovalofthisrequestbyJanuary20,1999,tomeetthestartupschedule.

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