ML17209A657
| 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
REGULATORNPORMAT IONDISTRIBUTION STEM(RIBS)ACCESSION NBR:8102250210.
DOC~DATE:81/01/26NOTARIZED:
NOFACIL:50389St9LuciePlantEUnit2EFloridaPower8LightCo~AUTH~NAMEAUTHORAFFILIATION UHRIGPR~E~FloridaPowerLLightCo,RECIP.NAB, RECIPIENT AFFILIATION 0REILLYiJ~P~Region2PAtlanta,OfficeoftheDirector
SUBJECT:
Finaldeficiency reptrepotentially reportable designdeficiency invalvesmfgbyTargetRockCorpiinitially reported801120~TargetRockhasmodifiedvalvedesigntoeliminate flowinducedvibration
~DISTRIBUTION CODE:B019SCOPIESRECEIYED:LTR
~ENCLSIZE:TITLE:Construction Deficiency Report(iOCFR50.55E)
NOTES:DOCKET05000389RECIPIENT IDCODE/NAME ACTION:A/DLICENSNG00RUSHBROOKPM
~06INTERNAL:
AD/RCI/IE17D/DIRHUMFAC15EDOLSTAFF19HYD/GEOBR22LICQUALBR12NRCPDR02PROCTTREV13e.~FIL0121COPIESLTTRENCL111111111111111111111RECIPIENT IDCODE/NAME YOUNGBLOODgB 05NERSESEV~07ASLBP/J~HARDDIREDIVOFLICEQUIPQUALBR11I8E09MPA20OELD21QABR10RUTHERFORD,lf, IECOPIESLTTRENCL1111111111'1111111111EXTERNAL:
ACRSNSIC1608161611LPDR0311pF836)99flTOTALNUMBEROFCOPIESREQUIRED:
LTTR39ENCL39 0H
.O.BOX529100,MIAMI,FL33152FLORIDAPOWERI(LIGHTCOMPANYJanuary26,1981L-81-25Mr.JamesP.O'Reilly,
- Director, RegionIIOfficeofInspection andEnforcement U.S.NuclearRegulatory Commission 101MariettaStreet,Suite3100Atlanta,Georgia30303
DearMr.O'Reilly:
Re:St.LucieUnit2DocketNo.50-389LowPressureSafetyInjection SystemValvesTargetRockValves-DesignDeficiency 50.55eOnNovember-24,1980-,FloridaPower8tLightCompany(FPL)notifiedtheOfficeofInspection andEnforcement, RegionIIofapotentially reportable designdeficiency inseveralvalvesmanufactured bytheTargetRockCorporation.
OnDecember23,1980(L-80-414),.
FPLsubmitted aninterimresponsewhichstatedthatthesubjectdeficiency wasbeingevaluated andthatafinalreportwouldbesubmitted byJanuary24,1981.FPLhascompleted itsevaluation, andafinalreportisattachedforyourreview.Verytrulyyours,RobertE.UhrigVicePresident AdvancedSystems8Technology REU/TCG/ah Attachment, cc:HaroldF.Reis,,Esquire,(w/o attachment)
Director.
ofInspection andEnforcement.
U.S.NuclearRegulatory Commission Washington, D.C.20555(w/attachment) pot'fgi(~>SoB,l>PEOPLE...
SERVINGPEOPLE h~"4~sIC',y~
FinalDesignDeficiency ReportTargetRockValves~SummarAdesigndeficiency wasidentified invalvesmanufactured byTargetRockCorporation andfurnished byCombustion Engineering.
Duetothedesigndeficiency thevalves,whenoperatedunderdesignconditions, wouldbepronetofailure.Thefailure.wouldconsistofthediscseparating fromthestem,cracksinthevalveseatandbackseat, andscoringofthediscbelowtheseatingsurface.Inaccordance withtherequirements of10CFR50.55(e),
theabovedeficiency isconsidered reportable.
Bytelephone FPLnotifiedtheNRConNovember24,1980,andaninterimreportwassubmitted onDecember23,1980(FPLLetterL-80-414).
Thisfinalreportissubmitted toadvisetheNRCofthedescrip-tionofthedeficiency andthecorrective actionsthatwillbetaken.DescritionOurNSSSvendor(Combustion Engineering) andMr.C.R.McFarland (NRC)informedFPLthata.designdeficiency hadbeenidentified inTargetRockvalves(8"motor-operatedglobevalve)attheSanOnofreNuclearGenerating Station(SONGS)andhadbeenreportedbySouthernCalifornia EdisontotheNRCunder10CFR50.55(e).
Aninvestigation concluded thatSt.LucieUnit2,globevalvesHCV3615,HCV3625,HCV3635,HCV3645,V3536,V3539,V3550,andV3551performthesameflowthrottling serviceasthevalvesintheSONGSunitandaresimilarindesigntotheSONGSvalvesthatfailed,exceptthatthe,St..Lucievalvesare6"(HCV3615,HCV3625,HCV3635,HCV3645),4"(V3536,V3539)and'"'V3550,V3551)insize.Thevalvefailure.at,SONGShasbeenattributed toexcessflowinducedvibration whilethevalvediscwasinapartially openposition.
Cracksinthevalveseatandbackseatweld.a'ndscoringofthevalvediscbelow.theseatingsurfacewouldresultfromimpactofthevibrating discontheseat.Corrective ActionTargetRockCorporation hasmodifiedtheirvalvedesigntoeliminate flowinducedvibration byproviding adiscwhichisguidedbytheseatinthepartially openedposition.,
Allaffected6",4",and3"valvescitedabovewillbereturnedtothevalvemanufacturer forinspection, rework,modifica-tionandtesting;SafetImlicationThisdeficiency couldhaveadversely affectedthesafetyofoperations atthe.plantduringits40yearlifeifitweretohaveremaineduncorrected.
Itrepresented asignificant deviation fromperformance specifications whichrequiredrepairstoestablish theadequacyofthecomponent toperformits intendedsafetyfunction.
Theaffectedval,vesarepartoftheSafetyInjection Systemwhosesafetyrelatedfunctionisto-insurethatadequateflowisdelivered totheReactorCoolantSystem,thusinsuringadequatecorecooling.Withouttheassurance ofvalvecomponent integrity whensubjected tothedesignbasisserviceconditions, safetyofplantoperations couldbejeopardized.
V.Conclusion Corrective actionasindicated inSectionIIIofthisreportwillbeunder-,takenbythe,vendortoassure.thatthevalvesareabletoperformtheirintendedsafetyfunction.
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