ML17209A657

Final Deficiency Rept Re Potentially Reportable Design Deficiency in Valves Mfg by Target Rock Corp,Initially Reported 801124.Target Rock Has Modified Valve Design to Eliminate Flow Induced Vibration

ML17209A657
Person / Time
Site:	Saint Lucie
Issue date:	01/26/1981
From:	UHRIG R E FLORIDA POWER & LIGHT CO.
To:	OREILLY J P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, L-81-25, NUDOCS 8102250210
Download: ML17209A657 (7)

Text

REGULATORNPORMATIONDISTRIBUTIONSTEM(RIBS)ACCESSIONNBR:8102250210.DOC~DATE:81/01/26NOTARIZED:NOFACIL:50389St9LuciePlantEUnit2EFloridaPower8LightCo~AUTH~NAMEAUTHORAFFILIATIONUHRIGPR~E~FloridaPowerLLightCo,RECIP.NAB,RECIPIENTAFFILIATION0REILLYiJ~P~Region2PAtlanta,OfficeoftheDirector

SUBJECT:

FinaldeficiencyreptrepotentiallyreportabledesigndeficiencyinvalvesmfgbyTargetRockCorpiinitiallyreported801120~TargetRockhasmodifiedvalvedesigntoeliminateflowinducedvibration~DISTRIBUTIONCODE:B019SCOPIESRECEIYED:LTR~ENCLSIZE:TITLE:ConstructionDeficiencyReport(iOCFR50.55E)NOTES:DOCKET05000389RECIPIENTIDCODE/NAMEACTION:A/DLICENSNG00RUSHBROOKPM~06INTERNAL:AD/RCI/IE17D/DIRHUMFAC15EDOLSTAFF19HYD/GEOBR22LICQUALBR12NRCPDR02PROCTTREV13e.~FIL0121COPIESLTTRENCL111111111111111111111RECIPIENTIDCODE/NAMEYOUNGBLOODgB05NERSESEV~07ASLBP/J~HARDDIREDIVOFLICEQUIPQUALBR11I8E09MPA20OELD21QABR10RUTHERFORD,lf,IECOPIESLTTRENCL1111111111'1111111111EXTERNAL:ACRSNSIC1608161611LPDR0311pF836)99flTOTALNUMBEROFCOPIESREQUIRED:LTTR39ENCL39 0H

.O.BOX529100,MIAMI,FL33152FLORIDAPOWERI(LIGHTCOMPANYJanuary26,1981L-81-25Mr.JamesP.O'Reilly,Director,RegionIIOfficeofInspectionandEnforcementU.S.NuclearRegulatoryCommission101MariettaStreet,Suite3100Atlanta,Georgia30303

DearMr.O'Reilly:

Re:St.LucieUnit2DocketNo.50-389LowPressureSafetyInjectionSystemValvesTargetRockValves-DesignDeficiency50.55eOnNovember-24,1980-,FloridaPower8tLightCompany(FPL)notifiedtheOfficeofInspectionandEnforcement,RegionIIofapotentiallyreportabledesigndeficiencyinseveralvalvesmanufacturedbytheTargetRockCorporation.OnDecember23,1980(L-80-414),.FPLsubmittedaninterimresponsewhichstatedthatthesubjectdeficiencywasbeingevaluatedandthatafinalreportwouldbesubmittedbyJanuary24,1981.FPLhascompleteditsevaluation,andafinalreportisattachedforyourreview.Verytrulyyours,RobertE.UhrigVicePresidentAdvancedSystems8TechnologyREU/TCG/ahAttachment,cc:HaroldF.Reis,,Esquire,(w/oattachment)Director.ofInspectionandEnforcement.U.S.NuclearRegulatoryCommissionWashington,D.C.20555(w/attachment)pot'fgi(~>SoB,l>PEOPLE...SERVINGPEOPLE h~"4~sIC',y~

FinalDesignDeficiencyReportTargetRockValves~SummarAdesigndeficiencywasidentifiedinvalvesmanufacturedbyTargetRockCorporationandfurnishedbyCombustionEngineering.Duetothedesigndeficiencythevalves,whenoperatedunderdesignconditions,wouldbepronetofailure.Thefailure.wouldconsistofthediscseparatingfromthestem,cracksinthevalveseatandbackseat,andscoringofthediscbelowtheseatingsurface.Inaccordancewiththerequirementsof10CFR50.55(e),theabovedeficiencyisconsideredreportable.BytelephoneFPLnotifiedtheNRConNovember24,1980,andaninterimreportwassubmittedonDecember23,1980(FPLLetterL-80-414).ThisfinalreportissubmittedtoadvisetheNRCofthedescrip-tionofthedeficiencyandthecorrectiveactionsthatwillbetaken.DescritionOurNSSSvendor(CombustionEngineering)andMr.C.R.McFarland(NRC)informedFPLthata.designdeficiencyhadbeenidentifiedinTargetRockvalves(8"motor-operatedglobevalve)attheSanOnofreNuclearGeneratingStation(SONGS)andhadbeenreportedbySouthernCaliforniaEdisontotheNRCunder10CFR50.55(e).AninvestigationconcludedthatSt.LucieUnit2,globevalvesHCV3615,HCV3625,HCV3635,HCV3645,V3536,V3539,V3550,andV3551performthesameflowthrottlingserviceasthevalvesintheSONGSunitandaresimilarindesigntotheSONGSvalvesthatfailed,exceptthatthe,St..Lucievalvesare6"(HCV3615,HCV3625,HCV3635,HCV3645),4"(V3536,V3539)and'"'V3550,V3551)insize.Thevalvefailure.at,SONGShasbeenattributedtoexcessflowinducedvibrationwhilethevalvediscwasinapartiallyopenposition.Cracksinthevalveseatandbackseatweld.a'ndscoringofthevalvediscbelow.theseatingsurfacewouldresultfromimpactofthevibratingdiscontheseat.CorrectiveActionTargetRockCorporationhasmodifiedtheirvalvedesigntoeliminateflowinducedvibrationbyprovidingadiscwhichisguidedbytheseatinthepartiallyopenedposition.,Allaffected6",4",and3"valvescitedabovewillbereturnedtothevalvemanufacturerforinspection,rework,modifica-tionandtesting;SafetImlicationThisdeficiencycouldhaveadverselyaffectedthesafetyofoperationsatthe.plantduringits40yearlifeifitweretohaveremaineduncorrected.Itrepresentedasignificantdeviationfromperformancespecificationswhichrequiredrepairstoestablishtheadequacyofthecomponenttoperformits intendedsafetyfunction.Theaffectedval,vesarepartoftheSafetyInjectionSystemwhosesafetyrelatedfunctionisto-insurethatadequateflowisdeliveredtotheReactorCoolantSystem,thusinsuringadequatecorecooling.Withouttheassuranceofvalvecomponentintegritywhensubjectedtothedesignbasisserviceconditions,safetyofplantoperationscouldbejeopardized.V.ConclusionCorrectiveactionasindicatedinSectionIIIofthisreportwillbeunder-,takenbythe,vendortoassure.thatthevalvesareabletoperformtheirintendedsafetyfunction.

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