ML17265A763

Requests Approval for Use of Relief Request Number 43 to Address Volumetric Examination Limitations (Less than 90%) Associated with a & B RHR Heat Exchanger Outlet Nozzle to Shell Welds.Approval Is Requested by Dec 31,2000

ML17265A763
Person / Time
Site:	Ginna
Issue date:	10/05/1999
From:	MECREDY R C ROCHESTER GAS & ELECTRIC CORP.
To:	VISSING G S NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9910150168
Download: ML17265A763 (8)

Text

REGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:9910150168DOC-DATE:99/10/05NOTARIZED:NO>AC$~,"'5(>-244RobertEmmetGinnaNuclearPlant,Unit1,RochesterG"'-PV'xd.c?SAME-.AUTHORAFFILIATION"94ECR06Y,R.C.RochesterGas&ElectricCorp.RE@'IP.NAMERECIPIENTAFFILIATIONVIS'SING,G.S.

SUBJECT:

RequestsapprovalforuseofReliefRequestnumber43toaddressvolumetricexaminationlimitations(lessthan90>)associatedwithA&BRHRheatexchangeroutletnozzletoshell.welds.ApprovalisrequeStedbyDec31,2000.DISTRIBUTIONCODE(A047DCOPIESRECEIVED:LTRENCLSIZE:TITLE:ORSubmittal:Inservice/Testing/RelieffromASMECodeNOTES:LicenseExpdateinaccordancewith10CFR2,2.109(9/19/72).DOCKETI05000244E05000244GRECIPIENTIDCODE/NAMELITTLE,SINTERNAL:ILECENTER01OGCRPRES/DET/MEBEXTERNAL:LITCOANDERSONNRCPDRCOPIESLTTRENCL111110111111RECIPIENTIDCODE/NAMEVISSING,GNUDOCS-ABSTRACTRES/DET/ERABNOACCOPIESLTTRENCL11110RENNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTETHTOHAVEYOURNAMEORORGANIZATIONREMOVEDFROMDISTRIBUTIONLISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION,CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION415-2083TOTALNUMBEROFCOPIESREQUIRED:LTTR10ENCL9 AND~ASubsidiaryofRGSEnergyGroup,Inc.ROCHESTERGASANDELECIICCORPORATION~89EASTAVENUE,ROCHESTER,N.Y.IrI6r19CNOI~7165d6-2700www.rge.cornROBERTC.MECREDYVicePresidentNvdeorOperationsOctober5,1999U.S.NuclearRegulatoryCommissionDocumentControlDeskAttn:GuyS.VissingProjectDirectorateIWashington,D.C.20555

Subject:

InserviceInspectionProgramASMESectionXIRequiredExaminationsThird10-YearIntervalReliefRequestNo.43R.E.GinnaNuclearPowerPlant'DocketNo.50-244

DearMr.Vissing:

ThepurposeofthisletteristoseekapprovalfortheuseofReliefRequestNumber43toaddressvolumetricexaminationlimitations(lessthan90%)associatedwiththeAandBResidualHeatRemovalHeatExchangerOutletNozzletoShellWelds.ThisReliefisrequestedforbvo(2)weldspursuanttotheprovisionsof10CFR50.55a(g)(5)(iii).Therequiredexaminationcoveragefortheidentifieditemsareimpracticalandwouldrequireredesigntoallowexaminationortobereplacedtoenableinspection.Justificationconcerninglimitationsareincludedintheattachmenttothisletter.Sincethisreliefrequestisforour3rd10-yearintervalISIprogram,whichendsDecember31,1999,approval,isrequestedbyDecember31,2000inaccordancewith10CFR50.55a(g)(5)(iv).Verytrulyyours,RobertC.MecredyAttachment99iQi5Qi6899iQQSPDRADOCKQSQQQ244pPoa0 C'

xc:Mr.GuyS.Vissing(MailStop8C2)ProjectDirectorateIDivisionofLicensingProjectManagementOfficeofNuclearReactorRegulationU.S.NuclearRegulatoryCommissionWashington,D.C.20555RegionalAdministrator,RegionIU.S.NuclearRegulatoryCommission475AllendaleRoadKingofPrussia,PA19406U.S.NRCGinnaSeniorResidentInspector ATTACHMENTRochesterGasandElectricCorporationGinnaStationDocketNo.50/244Third10-YearIntervalRequestforReliefNo.43ResidualHeatRemoval(RHR)HeatExchangerOutletNozzleWeldsExaminationLimitationsSystem/Component(s)forWhichRelief/ExemptionisRequested:ThisReliefRequestpertainstotwo(2)ResidualHeatRemoval(RHR)HeatExchangerOutletNozzletoShellWelds,ASMEClass2,CategoryC-B,ItemC2.32.ThereisonenozzleofthistypeassociatedwitheachofthetwoidenticalRHRHeatExchangers.TheCoderequiresthattheexaminationbeperformedwhenthecomponentisopened.BothHeatExchangerswereopenedandVolumetricallyexamined.Limitedcoverageisidentifiedbelow.Sum~arurIIWeldIDac169253ONSRHE-1B79%duetointernalweldedseparationplate169053ONSRHE-1A79%duetointernalweldedseparationplateII.ASMESectionXICodeRequirement:ASMESectionXICoderequiresessentially100%oftheweldlengthorareatoobtaincoverage.ASMESectionXICodeCaseN-460statesthatiftheentireexaminationvolumeorareacannotbeexaminedduetointerferencebyanothercomponentorpartgeometry,areductionincoverageisacceptableprovidedthatthecoverage(thelackof)islessthan10%.III.RequirementfromWhichReliefisRequested:Reliefisrequestedfromexamining100%oftheweldlengthorareasforthesetwo(2)identifieditems.Examining100%oftheweldlengthorareaswouldbeimpracticalduetooriginaldesigninterference.page1of3 h'equestforReliefNo.43IV.BasisforRelief/Exemption:Reliefisrequestedpursuanttotheprovisionsof10CFR50.55a(g)(5)(iii),therequiredexaminationcoveragefortheidentifieditemsareimpracticalandwouldrequireredesigntoallowexaminationortobereplacedtoenableinspection.ThetwoidenticalResidualHeatRemoval(RHR)HeatExchangerswasdesignedandconstructedtoASMESectionVIII,1965Edition.Thiscodedidnotcontainrequirementstoensurethatitemsbeaccessibleforfutureexaminations.Thetwo(2)ASMEClass2itemsidentifiedabovewereinstalledutilizingthisconstructioncodewhichdidnotprovideforaccessibilityforfutureISINDE.TheISIASMESectionXIvolumetricrequirementisidentifiedwithinTableIWC-2500-1,CategoryC-B,ItemNumberC2.32.TheResidualHeatRemoval(RHR)HeatExchangersispartoftheASMESectionXIVT-2LeakageExaminationboundary.LeakageExaminationsareperformedeachperiodasrequiredbyCategoryC-B,ItemNumberC2.33oftheCodetoinsurepressureboundaryintegrity.InadditiontotheASMESectionXIleakageexaminations,OperatorwalkdownsasspecifiedbyPlantOperatingProceduresarealsoperformed.Thecombinationofoperatorwalkdownsandperiodleakageexaminationsthatareperformedprovideadditionalassurancesinmaintainingplantsafety.V.AlternateExaminations:R.E.GinnaNuclearPowerPlantproposesthatthevolumetricexaminationcoverageidentifiedabovebeacceptableinfulfillingrequiredvolumetricexaminationcoverage.VI.JustificationfortheGrantingofRelief:TheResidualHeatRemoval(RHR)HeatExchangersweredesignedandconstructedtoASMESectionVIII,1965Editionconstructioncode.ThiscodedidnotcontainrequirementstoensurethatitemsbemadeaccessibleforfutureNDEexaminations.Duetotheoriginallimiteddesignaccessibility,examinationcoveragecannotbeobtainedtotheextentrequiredbythecurrentASMECode.ASMESectionXIperiodicleakageexaminationsareperformedaswellasOperatorwalkdownsasspecifiedbyPlantOperatingProcedures.Theseoperatorwalkdownsandperiodicsystemleakageexaminationsprovideadditionalassurancesinmaintainingplantsafety.Theidentifiedvolumetricexaminationcoveragefortheseitemsshouldbeacceptableinfulfillingcoveragerequirements.page2of3 RequestforReliefNo.43ItshouldalsobenotedthatReliefRequestNumber43issimilartoRG&E'sReliefRequestNumber19and34,whichwerepreviouslyapprovedbytheNRC.VII.ImplementationSchedule:Theseexaminationshavebeenperformed,andcodecreditshallbetakenfortheThird10-yearIntervalinspection.Page3of3 1SHELLTOUPPERHEADWELDCCW10G-AC5-15210F-AC5-152SUPPORTLEGLOCATION3-II-.75"AEAC02A2S36.5DIA.OUTLET00C-6101-AC5-152IOHAC5-152INLET44HOLES1,5"DIA.BOLTINGO1A-BT1B-BTaIIICCWIIgIFLANGETOUPPERSHELLWELDCLASS3CLASS2LOWERSHELLTOFLANGEWELDLSFWRHEINLETNOZZLETOSHELLINSRHEOUTLETNOZZLETOSHELLONSRHE8E-AC-601INLET8C-AC-601PuTLPTBA-AC-601BX-AC-601INLETREINFORCINGPLATEWELDIRPRHERHEA-2A-AC-601RHEB-2A-AC-601RHEA-28-AC-601RHEB-28-AC-601UPPER4LOWERVESSELSHELL304STAINLESS:.75THICKSUPPORTLEGSSTAINLESSS..625THICKA8CSOCKETWELDOUTLETREINFORCINGPLATEWELDORPRHELOWERHEADTOLOWERSHELLWELDLHLSWRHERHEA-2C-AC-601RHEB-2C-AC-601LINENO:CALIBRATIONBLOCK:REF.DRAWING:WESTINGHOUSE4807-133013-1247DRAWNBY:ABGDATE:11/I/95REVIEWEDBY:FAKDRAWINGNUMBERREV.RESIDUALHEATREMOVALHTEXCHANGERSFACILITYPEggP7ggROCHESTERGAS,hcELECTRICCORP.ROCHESTER.NEWYORK