ML17222A278

Responds to Generic Ltr 88-05 Re Boric Acid Corrosion of Carbon Steel Reactor Pressure Boundary Components.Principle Locations Where Leakage Could Degrade RCS Pressure Boundary Will Be Identified & Included in New Procedure

ML17222A278
Person / Time
Site:	Saint Lucie
Issue date:	05/31/1988
From:	CONWAY W F FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
GL-88-05, GL-88-5, L-88-244, NUDOCS 8806100130
Download: ML17222A278 (8)

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ACCEiZRATEDIHS%1BUTIDNDEMONSTRATIONSYSTEMREGULATORYINFORMATIONDISTRIBUTIONSYSTEM(RIDS)ACCESSIONNBR:8806100130DOC.DATE:88/05/31NOTARIZED:NOFACIL:50-335St.LuciePlant,Unit1,FloridaPower6LightCo.50-389St.LuciePlant,Unit2,FloridaPower6LightCo.AUTH.NAMEAUTHORAFFILIATIONCONWAY,W.F.FloridaPower&LightCo.RECIP.NAMERECIPIENTAFFILIATIONDocumentControlBranch(DocumentControl.Desk)

SUBJECT:

RespondstoGenericLtr88-05reboricacidcorrosionofcarbonsteelreactorpressureboundarycomponents.DISTRIBUTIONCODE:A001DCOPIESRECEIVED:LTRJENCL/SIZE:TITLE:ORSubmittal:GeneralDistributionNOTES:DOCKET05000335"05000389"'nRRECIPIENTIDCODE/NAMEPD2-2LATOURIGNY,EIINTERNAL:ACRSNRR/DEST/ADS7ENRR/DEST/ESB8DNRR/DEST/RSB8ENRR/PMAS/ILRB12OGC15-B-18RES/DE/EIBCOPIESLTTRENCL101166111111111011ARM/DAF/LFMBNRR/DEST/CEB8HNRR/DEST/MTB9HNRR/DOEA/TSBllNUDOCS-ABSTRACT01101111111111,RECIPIENT'COPIES",IDCODE/NAMELTTRENCLPD2-2PD55IAEXTERNAL:LPDRNSIC1111NRCPDR11DDTOTALNUMBEROFCOPIESREQUIRED:LTTR28ENCL25/

4i,I'f P.X14000,JUNOBEACH,FL33408.0420+4Lll~@$531$88L-88-244U.S.NuclearRegulatoryCommissionAttn:DocumentControlDeskWashington,D.C.20555Gentlemen:Re:St.LucieUnits1and2DocketNos.50-335and50-389BoricAcidCorrosionofCarbonSteelReactorPressureBoundarComonentsinPWRPlantsGenericLetter88-05ByletterdatedMarch17,1988,theNRCforwardedtoalloperatingpressurizedwaterreactors(PWRs)theabovereferencedgenericletter(GL).InthatGLtheNRCstatedthatitwasrequestinginformationtoassesssafeoperationofPWRswhenreactorcoolantleaksbelowtechnicalspecificationlimitsdevelopandthecoolantcontainingdissolvedboricacidcomesincontactwithand.,degradeslowalloycarbonsteelcomponents.Tothisend,theNRCrequestedassurancesthataprogramhasbeenimplementedconsistingofsystematicmeasurestoensurethatboricacidcorrosiondoesnotleadtodegradationofthereactorcoolantpressureboundary.FPL'sresponsetoGL88-05forSt.LuciePlantisattached.Ifadditionalinformationisrequired,pleasecontactus.Verytrulyyours,W.F.CoaySeniorVicePresident-NuclearWFC/EJW/gpAttachmentcc:Dr.J.NelsonGrace,RegionalAdministrator,RegionII,USNRCSeniorResidentInspector,USNRC,St.LuciePlantEJW88-05.GL8806100i3088053iPDRADQCK05000335PDCDanFPLGroupcompany STATEOFFLORIDA))stCOUNTYOFPALMBEACH)W.F.Conwabeingfirstdulysworn,deposesandsays:ThatheisSeniorVicePresident-Nuclear,ofFloridaPowerandLightCompany,theLicenseeherein;Thathehasexecutedtheforegoingdocument;thatthestatementsmadeinthisdocumentaretrueandcorrecttothebestofhisknowledge,informationandbelief,andthatheisauthorizedtoexecutethedocumentonbehalfofsaidLicensee.W.F.CSubscribedandsworntobeforemethisdayof,HOTLYPUBLIC,inandforCountyofPalmBeach,StateofFloridaNotaryPublic,StateofRoridaQyCommissionExpiresJunel,1989'y;COrimiSSiOneXpireSgoadedrhruTroyrara~ln5alaacalac, 4tJSCC,'-i'~Jj'

~'vATTACHMENTGL88-05PROGRAMInresponsetoGenericLetter88-05St.LuciePlantisrevisingitsprogramfordealingwithReactorCoolantSystem(RCS)leaks.Currently,St.LucieperformsleakinspectionsaftertheRCShasbeenopenedformaintenanceorforrefueling.Thisprogramwillbeexpandedtoincludeinspectionsthatmaybedoneatpowerorafterreactortrips.AprocedurewillbewrittentoimplementtheseadditionalinspectionsandisexpectedtobeinplacebyJuly15,1988.Responsesfor,thespecificgenericletteritemsareasfollows:Theprogramshouldincludeadeterminationoftheprincipallocationswhere,leaksthataresmallerthantheallowabletechnicalspecificationlimitcancausedegradationoftheprimarypressureboundarybyboricacidcorrosion.Particularconsiderationshouldbegiventoidentifyingthoselocationswhereconditionsexistthatcouldcausehighconcentrationsofboricacidonpressureboundarysurfaces.ResponseITheprinciplelocationswhereleakagecoulddegradetheRCSpressureboundarywillbeidentified.Theselocationswillbeincludedinthenewprocedure.2~Theprogramshouldincludeproceduresforlocatingsmallcoolantleaks(i.e.,leakageratesatlessthantechnicalspecificationslimits).Itisimportanttoestablishthepotentialpathoftheleakingcoolantandthereactorpressureboundarycomponentsitislikelytocontact.Thisinformationisimportantindeterminingtheinteractionbetweentheleakingcoolantandreactorcoolantpressureboundarymaterials.ResponseTheprocedurewillincludeactionstobetakenintheeventofanindicationofanRCSleak(e.g.,sumplevel,flow,leakrate)inconjunctionwithanunexplainedincreaseincontainmentairborneactivity.Areassusceptibletoboricacidcorrosionwillbeidentified.EJW88-05.GL 3.Theprogramshouldincludemethodsforconductingexaminationsandperformingengineeringevaluationstoestablishtheimpactonthereactorcoolantpressureboundarywhenleakageislocated.Thisshouldincludeprocedurestopromptlygatherthenecessaryinformationforanengineeringevaluationbeforetheremovalofevidenceofleakage,suchasboricacidcrystalbuildup.ResponseAnexaminationmethodwillbeprovidedintheaboveprocedure.Itwillcontainthenecessaryrequirements(leakrates,temperatures,pressures,boricacidsamples,affectedequipment,etc.)forengineeringevaluations.Engineeringprocedurescurrentlyexistwhichprovideforevaluationsofnon-conformancessuchasthosewhichmightresultfromRCSleaks.4~Theprogramshouldincludecorrectiveactionstopreventrecurrencesofthistypeofcorrosion.Thisshouldincludeanymodificationstobeintroducedinthepresent.designoroperatingproceduresoftheplantthat(a)reducetheprobabilityofprimarycoolantleaksatthelocationswheretheymaycausecorrosiondamageand(b)entailtheuseofsuitablecorrosionresistantmaterialsortheapplicationofprotectivecoatings/cladding.ResponseCorrectiveactionsarecoveredundercurrentplantprocedures.Considerationofdesignchangeswillbedoneonacase-by-casebasis.EJW88-05.GL 4-~0r~)