ML18030A369

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Forwards, Analysis of Pitting Corrosion Failures in ESW Sys RHR Lube Oil Coolers & RCIC Pump Room Unit Coolers at Susquehanna Steam Electric Station.
ML18030A369
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 11/12/1990
From: KEISER H W
PENNSYLVANIA POWER & LIGHT CO.
To: BUTLER W R
Office of Nuclear Reactor Regulation
Shared Package
ML17157A422 List:
References
PLA-3457, NUDOCS 9011190326
Download: ML18030A369 (3)


Text

ACCELERATEDDISTRIBUTIONDEMONSTRATIONSYSTEM-~REGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS),ACCESSIONNBR:9011190326DOC.DATE:90/11/12NOTARIZED:NODOCKETFACIL:50-387SusquehannaSteamElectricStation,Unit1,Pennsylva0500038750-388SusquehannaSteamElectricStation,Unit2,Pennsylva05000388AUTH.NAMEAUTHORAFFILIATIONKEISER,H.W.PennsylvaniaPower6LightCo.RECIP.NAMERECIPIENTAFFILIATIONBUTLER,W.R.ProjectDirectorateI-2

SUBJECT:

Forwards,"Analysis,ofPittingCorrosionFailuresinESWSysRHRLubeOilCoolers6RCICPumpRoomUnitCoolers...."DISTRIBUTIONCODEA001DCOPIESRECEIVED:LTR'NCLSIZETITLE:ORSubmittal:GeneralDistributionRDNOTES:LPDR1cyTranscripts.LPDR1cyTranscripts.0500038705000388RECIPIENTIDCODE/NAMEPDl-2LATHADANI,MNTERNAL:ACRSNRR/DOEA/OTSB11NRR/DST/SELB8DNRR/DST/SRXB8E../~REGFILE01'XTERNAL:NRCPDRNOTESCOPIESLTTRENCL11226611111110111122RECIPIENTIDCODE/NAMEPD1-2PDNRR/DET/ECMB9HNRR/DST8E2NRR/DST/SICB7ENUDOCS-ABSTRACTOGC/HDS2RES/DSIR/EIBNSICCOPIESLTTRENCL1111111111101111DDSRDNOTETOALL"RIDS"RECIPIENTS:PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATEYOURNAMEFROMDISTRIBUTIONLISlSFORDOCUMENTSYOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:LTTR25ENCL23DD

~ggg,PennsylvaniaPoweriiLightCompanyTwoNorthNinthStreet~Allentown,PA18101-1179~215m0-5151HaroldW.KelserSeniorV/cePresident-Nuclear215/770.4194NOY~~19O.DirectorofNuclearReactorRegulationAttention:Dr.W.R.Butler,ProjectDirectorProjectDirectorateI-2DivisionofReactorProjectsU.S.NuclearRegulatoryCommissionWashington,D.C.20555SUSQUEHANNASTEAMELECTRICSTATIONFINALREPORTONRHRMOTOROILCOOLERFAILUREDocketNos.50-387PLA-3457FILESR41-2A227Dand50-388

DearDr.Butler:

ThepurposeofthisletteristoprovidePP&L'sfinalrootcauseevaluationoftheRHRpumpmotoroilcoolerfailurewhichtookplaceonMay28,1990.Thereportconcludesthatfailureofthe2CRHRPumpMotorOilCoolerwasnottheresultofMicrobiologicallyInfluencedCorrosion(MIC)norwasthepittingrecentinorigin.ThecauseofthepittingwasUnderDepositCorrosioncausedbymanganese,iron,siltandsedimentwithsomeinfluencebymicrobiologicactivity.Deteriorationtookplaceoveraperiodofyears.Therateofcorrosionwasinfluencedbysuchfactorsasheat,stagnationandvelocitybuttheactual,unanticipatedfailurewasthedirectresultofthelackofcleaningandinspectionwhichwouldhaveprovidedthedataneededtopredictthelifeexpectancyofthecooler.PP&LwillensurethattheRHRpumpmotoroilcoolersarereplacedpriortotheendofusefullife.Inaddition,PP&Lwillevaluatereplacementofthecoppercoilswithmaterialswhicharelessaffectedbythecorrosionproductspresentinthecoolingwater.AGO6PDOCK05'OOO3~~PDC 2-FILER41-2/A22-7DPLA-3457Dr.W.R.ButlerThisrevisionoftheinspectionrequirementswilltakeplacebyDecember31,1990toallowpreventativemeasurestobetakenbeforethe10yearlifeofthereplacementcoolersisreached.Inconclusion,weareconfidentthattheactionsdescribedhereinareconservativeandadequateandthereforeassurethecontinuedsafeoperationoftheplant.Verytrulyyours,H.W.eisercc:NRCDocument-Con.rolDesk(original,withAttachment)NRCRegionIMr.M.C.Thadani,NRCProjectManagerMr.G.S.Barber,NRCSr.ResidentInspector