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

ACCELERATED DISTRIBUTION DEMONSTRATION SYSTEM-~REGULATORY INFORMATION DISTRIBUTION SYSTEM(RIDS),ACCESSION NBR:9011190326 DOC.DATE:

90/11/12NOTARIZED:

NODOCKETFACIL:50-387 Susquehanna SteamElectricStation,Unit1,Pennsylva 0500038750-388Susquehanna SteamElectricStation,Unit2,Pennsylva 05000388AUTH.NAMEAUTHORAFFILIATION KEISER,H.W.

Pennsylvania Power6LightCo.RECIP.NAME RECIPIENT AFFILIATION BUTLER,W.R.

ProjectDirectorate I-2

SUBJECT:

Forwards, "Analysis, ofPittingCorrosion FailuresinESWSysRHRLubeOilCoolers6RCICPumpRoomUnitCoolers...."

DISTRIBUTION CODEA001DCOPIESRECEIVED:LTR

'NCLSIZETITLE:ORSubmittal:

GeneralDistribution RDNOTES:LPDR 1cyTranscripts.

LPDR1cyTranscripts.

0500038705000388RECIPIENT IDCODE/NAME PDl-2LATHADANI,M NTERNAL:ACRSNRR/DOEA/OTSB11 NRR/DST/SELB 8DNRR/DST/SRXB 8E../~REGFILE01'XTERNAL:

NRCPDRNOTESCOPIESLTTRENCL11226611111110111122RECIPIENT IDCODE/NAME PD1-2PDNRR/DET/ECMB 9HNRR/DST8E2NRR/DST/SICB 7ENUDOCS-ABSTRACT OGC/HDS2RES/DSIR/EIB NSICCOPIESLTTRENCL1111111111101111DDSRDNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE!CONTACTTHEDOCUMENTCONTROLDESK,ROOMPl-37(EXT.20079)TOELIMINATE YOURNAMEFROMDISTRIBUTION LISlSFORDOCUMENTS YOUDON'TNEED!TOTALNUMBEROFCOPIESREQUIRED:

LTTR25ENCL23DD

~ggg,Pennsylvania PoweriiLightCompanyTwoNorthNinthStreet~Allentown, PA18101-1179

~215m0-5151 HaroldW.KelserSeniorV/cePresident-Nuclear 215/770.4194 NOY~~19O.DirectorofNuclearReactorRegulation Attention:

Dr.W.R.Butler,ProjectDirectorProjectDirectorate I-2DivisionofReactorProjectsU.S.NuclearRegulatory Commission Washington, D.C.20555SUSQUEHANNA STEAMELECTRICSTATIONFINALREPORTONRHRMOTOROILCOOLERFAILUREDocketNos.50-387PLA-3457FILESR41-2A227Dand50-388

DearDr.Butler:

ThepurposeofthisletteristoprovidePP&L'sfinalrootcauseevaluation oftheRHRpumpmotoroilcoolerfailurewhichtookplaceonMay28,1990.Thereportconcludes thatfailureofthe2CRHRPumpMotorOilCoolerwasnottheresultofMicrobiologically Influenced Corrosion (MIC)norwasthepittingrecentinorigin.ThecauseofthepittingwasUnderDepositCorrosion causedbymanganese, iron,siltandsedimentwithsomeinfluence bymicrobiologic activity.

Deterioration tookplaceoveraperiodofyears.Therateofcorrosion wasinfluenced bysuchfactorsasheat,stagnation andvelocitybuttheactual,unanticipated failurewasthedirectresultofthelackofcleaningandinspection whichwouldhaveprovidedthedataneededtopredictthelifeexpectancy ofthecooler.PP&LwillensurethattheRHRpumpmotoroilcoolersarereplacedpriortotheendofusefullife.Inaddition, PP&Lwillevaluatereplacement ofthecoppercoilswithmaterials whicharelessaffectedbythecorrosion productspresentinthecoolingwater.AGO6PDOCK05'OOO3~~

PDC 2-FILER41-2/A22-7D PLA-3457Dr.W.R.ButlerThisrevisionoftheinspection requirements willtakeplacebyDecember31,1990toallowpreventative measurestobetakenbeforethe10yearlifeofthereplacement coolersisreached.Inconclusion, weareconfident thattheactionsdescribed hereinareconservative andadequateandtherefore assurethecontinued safeoperation oftheplant.Verytrulyyours,H.W.eisercc:NRCDocument-Con.

rolDesk(original, withAttachment)

NRCRegionIMr.M.C.Thadani,NRCProjectManagerMr.G.S.Barber,NRCSr.ResidentInspector