ML17333A636

Forwards RAI Re Requests for Relief from Code Cases N-521, N-491,N-509 & N-524

ML17333A636
Person / Time
Site:	Cook
Issue date:	11/07/1996
From:	FITZPATRICK E AMERICAN ELECTRIC POWER CO., INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:0969AA, AEP:NRC:969AA, TAC-M94871, TAC-M94872, NUDOCS 9611150063
Download: ML17333A636 (17)

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1~hrCATEGORYj.REGULATCINFORMATIONDISTRIBUTIONSTEM(RIDE)ACCESSIONNBR:9611150063DOC.DATE:96/11/07NOTARIZED:NOFACIL:50-315Donald.C.CookNuclearPowerPlant,Unit1,indianaM50-316DonaldC.CookNuclearPowerPlant,Unit2,IndianaMAUTH.NAMEAUTHORAFFILIATIONFITZPATRICK,E.EAmericanElectricPowerCo.,Inc.RECIP.NAMERECIPIENTAFFILIATIONDocument.ControlBranch(DocumentControlDesk)DOCKET0500031505000316

SUBJECT:

ForwardsRAIrerequestsforrelieftoCodeCasesN-521,N-491,N-5096N-524.rDISTRIBUTIONCODE:A047DCOPIESRECEIVED'LTRLENCLSIZE:IITITLE:ORSubmittal:lnservice/Testing/RelieffromASMCode-GL-9-04NOTES:TERECIPIENTIDCODE/NAMEPD3-3LAHICKMANFJINTERNAL:AEOD/SPD/RABNRR/DE/EMEBOGC/HDS2RES/DSIR/EIBCOPIESLTTRENCL1111-11111011RECIPIENTIDCODE/NAMEPD3-3PDECENTER1NUDOCS-ATRACTRES/DET/EMMEBCOPIESLTTRENCL111111110EXTERNAL:LITCOANDERSONNRCPDR11NOAC1111D0ENNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROFCOPIESREQUIRED:LTTR13ENCL12 AmericanElectricP~erNuclearGeneration+p500CircleDriveBuchanan,MI491071395November7,1996DocketNos.:50-31550-316U.S.NuclearRegulatoryCommissionATTN:DocumentControlDeskWashington,D.C.20555Gentlemen:ANMICINtFI.KCfRICPOWMAEP:NRC:0969AADonaldC.CookNuclearPlantUnits1and2THIRD10-YEARINTBRVALINSERVICEINSPECTIONPROGRAMANDASSOCIATEDREQUESTSFORRELIEF(TACNOS.M94871ANDM94872)REQUESTFORADDITIONALINFORMATIONReferencesLetterAEP:NRC:0969AW,E.E.Fitzpatri,cktoU.S.NRC,"DonaldC.CookNuclearPlantUnits1and2,THIRD10-YEARINTERVALINSERVICBINSPECTIONPROGRAMANDASSOCIATEDREQUESTSFORRELIEF(TACNOS.M94871ANDM94872),REQUESTFORADDITIONALINFORMATION"dated,September10,1996.2.Letter,C.A.CarpentertoE.E.Fitzpatrick,"D.C.COOK,UNITS1AND2,REQUESTINGAPPROVALOFCODECASEN-498-1ASANALTERNATIVETOTHBREQUIREDHYDROSTATICPRESSURETEST(TACNOS.M91783ANDM91784)",datedJuly5,1995.Thethird10-yearinserviceinspectionplanforCookNuclearPlantutilizescodecasesthathavenotbeenincorporatedintoRegulatoryGuide1.147.Becauseofthis,NRCapprovaloftheuseofthesecodecasesasalternativestotheASMESectionXIrequirementsisrequired,TheparticularcodecasesforwhichapprovalisrequiredwereidentifiedinourSeptember10,1996,letter(reference1).TheattachmentstothisletterprovidereliefrequeststhatwouldallowCookNuclearPlanttouseCodeCasesN-521,N-491-1,N-509,andN-524asalternativestotherequirementsofthe1989editionofASMECodeSectionXI.PleasenotethatalthoughCodeCaseN-498-1wasidentifiedinreference1,thisletterdoesnotcontainareliefrequestforuseofthiscodecasebecausewepreviouslyobtainedapprovalforitsuse(reference2).ApprovaloftheserequestsisrequiredbyJuly1,1997.E.E.FitzpatrickVicePresidentAttachmentsh9'6ii150063961107~i.PDR).ADOCK050003i5:6'~POREli U.S.NuclearRegulatoryCommissionPage2AEP:NRC:0969AAcc:A.A.BlindA.B.BeachMDEQ-DW&RPDNRCResidentInspectorJ.R.Padgett Attachment1toAEP:NRC:0969AABACKGROUNDINPORMATIONANDJUSTIFICATIONTOUSECODECASEN-521ASANALTERNATIVEPORTHEEXAMINATIONOPNOZZLETOVESSELANDSAFEENDWELDSANDINSIDERADIUSSECTIONSPORTHECOOKNUCLEARPLANTUNITS1and2THIRD10"YEARINTERVAL

Attachment-1toAEP:NRC:0969AAPage1System/ComponentforwhichreliefisrequestedNozzletovesselwelds,nozzleinsideradiussections,and'nozzletosafeendweldsforCookNuclearPlant,units1and2.lZ.CodeRequirementsExaminationcategoriesB-DandB-F,itemsB3.90andB3.100ofASMESectionXIcode,1989editionwithnoaddenda,require100~volumetricexaminationperIWA-2500-7ofatleast25~butnotmorethan50%ofreactorvesselnozzletovesselweldsandnozzleinsideradiussectionsbytheendofthefirstperiod.ExaminationcategoryB-F,item5.10requires100%surfaceandvolumetricexaminationperfigureIWB-2500-8ofdissimilarmetalnozzletosafeendweldsthatmaybeexaminedcoincidentwiththevesselnozzleexaminations.ZZI.BasisforcodereliefTheASMESectionXIcoderequirementsfortheexaminationofreactorpressurevesselnozzletovesselwelds,thenozzleinsideradiussections,andnozzletosafeendweldsstipulateadistributionoftheseexaminationsinatleasttwoofthethreeperiods.Thesamesequenceestablishedinthefirst10-yearintervalmustbeusedforsuccessive10-yearintervals.Theimplementationofthesecoderequirementswouldresultinanadditionalset-upoftheautomatedultrasonic(UT)equipmentusedtoexaminethenozzletovesselwelds,insideradiussections,andnozzletosafeendwelds.Additionally,personnelradiationexposurewouldincreaseduetotheadditionalset-upofautomatedUTequipmentandsupporthoursneededtoperformthisexamination.Thispositionisfurthersupportedbythefollowing.CodeCaseN-521issuedbytheASMESectionXIorganizationprovidesanacceptablealternativetothecodemethodfortheexaminationofthenozzletovesselandsafeendwelds,andinsideradiussections.ThiscodereliefwasapprovedforusefortheV.C.SummerNuclearPlant,forthesecond10-yearinterval(reference1).AlternativeMethodAsanalternativetotherequirementsofthe1989editionoftheASMESectionXIcode,itisproposedtoperformallthenozzletovessel,nozzletosafeendwelds,andinsideradiussectionexaminationsinthethirdperiodofthethirdinterval.V.JustificationforgrantingcodereliefCodeCaseN-521imposesthefollowingconditionsthatmustbemetpriortoitsuse:

Attachment1toAEP:NRC:0969AAPage2noinservicerepairsorreplacementsbyweldinghavebeenperformedonthenozzletovesselandsafeendwelds,orinsideradiussection;thenozzletovesselandsafeendweldsandtheinsideradiussectionexaminationvolumeshallnotcontainflawsthatrequiresuccessiveexaminationsinaccordancewithZWA-2420(b);andtheunitisnotinthefirst10-yearinterval.CookNuclearPlanthasnotperformedinservicerepairsorreplacementsonthenozzletovesselandsafeendwelds,andinsideradiussections.Flawshavenotbeenidentifiedintheexaminationvolumethatrequiresuccessiveexaminationsandbothunits1and2areinthethird10-yearinterval;therefore,applicabilityofthiscodecasehasbeenmet.Thedeferralofallexaminationstothethirdperiodofthethird10-yearintervalwillresultinreducedset-uphoursandpersonnelradiationexposurehoursduetoconsolidationofmanpowerefforts(set-upandsupport)tothethirdperiodofthethird10-yearinterval.Theexaminationofnozzletovesselweldsfromtheshellsidewasperformedforunits1and2inthethirdperiodofthesecond10-yearintervalduringthe1995and1996refuelingoutages.Examinationofnozzletovesselweldsfromtheboreinsidediameter(fourforunit1andtwoforunit2)wereperformedinthefirstperiodtomeetcoderequ'rements.Thesecond10-yearintervalexaminationoftheinsideradiussectionsandnozzletosafeendweldswasperformedinaccordancewithtableZWA-2500-1ofthecode(atleast25%butnotmorethan50%inthefirstperiodandthebalanceof100%inthethirdperiod).Fouroftheeightinsideradiussectionsandnozzletosafeendweldswereperformedinthethirdperiod(1995)ofthesecond10-yearintervalforunit1.Sixofeightinsideradiussectionsandnozzletosafeendweld'orunit2wereexaminedin1996.Becauseweperformedamajorityoftheexaminationsinthethirdperiodofthesecond10-yearinterval,andtherewerenoflawsdetectedinanyoftheexaminationsconductedinthefirstorsecondintervals,itisreasonabletoconcludethatthedefermentofalltheexaminationstothethirdperiodofthethird10-yearintervalwillnotcompromisethesafetyofplantpersonnelorequipment.ThealternatetestusingCodeCaseN-521eliminatesthehardshipofperformingtwoautomatedexaminationsperinspectionintervalwhileprovidinganacceptablelevelofqualityandsafetyforCookNuclearPlant.VZ.ReferenceLetter,F.J.HebdontoG.J.Taylor,"EvaluationofReliefRequestsforRR-07andIWA-5242(a),VirgilC.SummerNuclearStation(TACNos.M94363andM94364),"datedApril11,1996.

Attachment2toAEP:NRC:0969AABACKGROUNDINFORMATIONANDJUSTIFICATIONTOUSECODECASEN-491-1ASANALTERNATIVEFORTHEZNSPECTZONOFCLASS1,2,3,ANDMCCOMPONENTSUPPORTSFORCOOKNUCLEARPLANTUNITS1and2THIRD10-YEARINTERVAL Attachment2toAEP:NRC:0969AAPage1System/Componentforwhich,reliefisrequestedClass1,2,3,andMCcomponentsupports.CodeRequirementsTableIWF-2500-1,examinationcategoryF-A,itemsF1.10throughF1.70ofthe1989editionofASMESectionXIcode,requiresvisualandVT-3examinationofclass1,2,and3'upportsinaccordancewiththescheduleestablishedforcomponentsunderIWB,IWC,IWDandIWE.III.BasisforcodereliefThe1989editionoftheASMESectionXIcoderequirestheexaminationofcomponentsupportsbebasedonafrequencyinaccordancewiththeIWB,IWC,IWD,andIWEcomponentsforeachinterval.Theproposedal"ernativemethodtobeusedbyCookNuclearPlantandoutlinedinASMECodeCaseN-491-1providesaselectioncriteriabasedonapplyingareasonablepercentageofexaminationsforeachclassofcomponentsupports.Significantpersonnelradiationexposureandcontaminationsavingsarepredictedtoresultfromtheimplementationoftheserequirementscomparedwiththerequirementsstatedinthe1989editionoftheASMESectionXIcode.IV.CodeCaseN-491-1wasapprovedbytheASMESectionXIorganizationinApril1993,andprovidesanacceptablealternativetothecodemethodfortheexaminationofcomponentsupports.AlternativeMethodV.Asanalternativetotherequirementsofthe1989editionoftheASMESectionXIcode,itisproposedtoperformexaminationofcomponentsupportsinaccordancewiththerequirementsestablishedinASMEapprovedCodeCaseN-491-1.JustificationforgrantingcodereliefTheASMESectionXIcodeorganizationhasapprovedtheuseofCodeCaseN-491-1asanacceptablealternative'othecoderequirementsfortheexaminationofcomponentsupports.Pipingsystemsareexaminedfrequentlyduringplantwalkdownswiththyunitsoperatingorduringplannedorunplannedoutages.Ifthefailureordegradationofasupportisobservedduringthesewalkdowns,whethertheyareformalvisual/VT-3examinationsorinformalobservations,promptactionistakenincludingtheevaluation,repair,and/orreplacementof"supports.Theuseoftheproposedalternativefortheinspectionandexaminationofcomponentsupportswillresultinsignificantlaboranddosesavingswhileprovidinganacceptablelevelofqualityandsafety.

Attachment3toAEPsNRCs0969AABACKGROUNDINFORMATIONANDJUSTZPICATIONTOUSECODECASEN-509ASALTERNATIVERULESPORTHESELECTZONANDINSPECTIONOPCLASS1,2,and3INTEGRALLYWELDEDATTACHMENTSPORCOOKNUCLEARPLANTUNITS1and2THIRD10-YEARINTERVAL r

Attachment3toAEP:NRC:0969AAPage1System/ComponentforwhichreliefisrequestedClass1,2,and3integrallyweldedattachments.CodeRequirementsTableIWB-2500-1,examinationcategoriesB-HandB-K-1;tableIWC-2500-1,examinationcategoryC-C;andtableIWD-2500-1,examination'ategoriesD-A,D-B,andD-Cofthe1989editionofASMESectionXIcoderequiresurfaceorvolumetricexaminationforweldedattachmentsofvessels,piping,pumps,andvalves.III.BasisforcodereliefThe1989editionoftheASMESectionXIcoderequirestheexaminationofintegrallyweldedattachmentstobebasedontherequirementsindicatedintablesIWB-2500-1throughIWD-2500-1.Frequencyandextentofexaminationareinaccordancewiththesetablesandtheinspectionprogramchosenbytheowner.TheproposedalternativemethodtobeusedbyCookNuclearPlantandoutlinedinASMECodeCaseN-509providesselectioncriteriabasedonidentifieddeformationofthecomponentsupportmembersfoundintheplanteitherduringoperation,refueling,maintenance,examination,inserviceinspection,ortesting.ThecriteriastatedinCodeCaseN-509aremorereasonablethantherandomexaminationofallweldedattachmentsinthattheyfocustheexaminationandtheevaluationonthosecomponentsupportsandweldedattachmentsthataresusceptibletoearlyfailure.Significantpersonnelradiationexposureandcontaminationsavingsarepredictedtoresultfromtheimplementationoftheserequirements.CodeCaseN-509wasapprovedinNovember1992bytheASMESectionXIorganizationandprovidesanacceptablealternativetothecodemethodfortheexaminationofweldedattachmentsforvessels,piping,pumps,andvalves.IV.'lternativeMethodAsanalternativetotherequirementsofthe1989editionoftheASMESectionXIcode,itisproposedtoperformexaminationofweldedattachmentsforvessels,piping,pumps,andvalvesinaccordancewithCodeCaseN-509.V.JustificationforgrantingcodereliefTheASMESectionXIcodeorganizationhasapprovedtheuseofCodeCaseN-509asanacceptablealternative,tothecoderequirementsfortheexaminationofweldedattachmentsforvessels,piping,pumps,andvalves.Componentsupportsareexaminedfrequentlyduringplantwalkdowns,bothwiththeunitsoperatingorduringplannedorunplannedoutages.Ifafailureordeformationofacomponentsupportisobservedduringthesewalkdowns,asurfaceexaminationoftheappropriateboundaryofthewelded Attachment3toAEP:NRC:0969AAPage2attachmentshallbeperformedinaccordancewithCodeCaseN-509.Thisexaminationstrategyismorereasonablethanthecodemethodofrandomexaminationofweldedattachmentsduetoitsfocusonhigherstressedcomponentsupportsthatwouldbemoresusceptibletofailureintheattachmentweld.Theuseoftheproposedalternativefortheinspectionandexaminationofweldedattachmentswillresultinsignificantlaboranddosesavingswhileprovidinganacceptablelevelofqualityandsafety.

Attachment4toAEP:NRC:0969AABACKGROUNDINFORMATIONANDKJSTIFICATZONFORTHEUSEOFCODECASEN-524ASANALTERNATIVEFORTHEEXAMZHATIONREQUIREMENTSFORLONGITUDINALWELDSZNCLASS1AND2PIPINGFORCOOKNUCLEARPLANTUNITS1AND2THIRD10-YEARINTERVAL Attachment4toAEP:NRC:0969AAPage1IZ.System/ComponentforwhichreliefisrequestedClass1and2longitudinalweldsinpiping.CodeRequirementsTableIWB-2500-1,examinationcategoryB-J,itemsB9.12andB9.22,andtableIWC-2500-1,examinationcategoriesC-F-1andC-F-2ofASMESectionXIcode,1989editionwithnoaddenda,requirevolumetricand/orsurfaceexaminationfromtheintersectionoflongitudinalandcircumferentialweldsforadistanceofonepipediameterinlengthbutnogreaterthanonefootmaximumforclass1weldsandtwoandone-halftimesthepipewallthicknessforclass2welds.IIZ.BasisforcodereliefZV.The1989editionofASMESectionXIcoderequirestheexaminationoflongitudinalclass1and2pipingweldsbeinaccordancewiththerequirementsoftablesIWB-2500-1andIWC-2500-1.Thelengthofweldexaminedshallbeonepipediameterbutnogreaterthanonefootmaximumforclass1weldsandtwoandone-halftimesthewallthicknessforclass2welds.Class1and2longitudinalpipingweldsdoexistin~ariousCookNuclearPlantsystems.CodeCaseN-524providesanacceptablealternativethatexaminestheintersectionalareaofcircumferentialandlongitudinalwelds,whichistheareamostpronetofailure.ThispositionisfurthersupportedbytheapprovalofCodeCaseN-524bytheASMESectionXIorganizationasanacceptablealternativetothecodeexaminationofclass1and2longitudinalpipingwelds.AlternativeMethodV.Asanalternativetotherequirementsofthe1989editionoftheASMESectionXIcode,itisproposedtoexamineclass1and2longitudinalpipingweldsinaccordancewiththerequirementsstatedinASMECodeCaseN-524.JustificationforgrantingcodereliefCodeCaseN-524wasapprovedbytheASMESectionXIcodeorganizationfortheexaminationofclass1and2longitudinalpipeweldsasanalternatemethodtothecodeexamination.Thiscodecaseacceptsthecodeexaminationofthecircumferentialweldvolumeassufficientindeterminingtheintegrityoftheintersectionofcircumferentialandlongitudinalwelds.Theintersectionofthelongitudinalandcircumferentialweldsisexpectedtopossessthehighestresidualstressesofthecollectiveweldduetothemanufacturingprocessandtherefore,athoroughcodeexaminationofthecircumferentialweldvolumewouldbeadequateindeterminingtheintegrityofthisarea.Additionally,therehavebeennoreportedfailuresintheindustry,wherethefailurewasinitiatedoutsidetheintersectionareathatwouldbeexaminedduringtheultrasonictestingofthecircumferentialweld.

Attachment4toAEP:NRC:0969AAPage2Theimplementationofthiscodecasewillsignificantlyreducelaborandradiationexposureduetodecreasedscaffoldinginstallationandinsulationremovalforvisualaccesstothelongitudinalwelds,.Theuseofthiscodecaseprovidesanacceptablealternativetothecurrentcodemethodofexaminingclass1and2longitudinalpipingweldswhileprovidinganacceptablelevelofqualityandsafety.

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