ML18018B215

LER 77-017-00 for Dresden Unit 2 Regarding Failure of the Ball Isolation Valve on E Traversing Incore Probe Guide Tube to Open from the Control Room as Required

ML18018B215
Person / Time
Site:	Dresden
Issue date:	05/13/1977
From:	Stephenson B B Commonwealth Edison Co
To:	Keppler J G Office of Nuclear Reactor Regulation
References
BBS Ltr. #77-773 LER 77-017-00
Download: ML18018B215 (8)

Text

TO:Mr.JamesGoKepplerFROM:CommonwealthEdisonComp'anyMorris,IllBoBoStephensenNRCbFORM195U.S.NUCLEARREGULATORYCSSION--12.76)--~-NRCDISTRIBUTIONFORPART50DOCKETMATERIALDOCKETNUMBER95-49FILENUMBERINCIDENTREPORTDATEOFDOCUMENT5/13/77DATERECEIVED6/8/77PfLETTEREfoRIlIINAL,OCOPYDESCRIPTION0NOTORIZE0gkJNCLASSIFIEDtPROPa~'aINPUTFORMENCLOSURENUMBEROFCOPIESRECEIVEDI&idQCDIIl~C~QQ'i7aa~~~Iihgg)gag:j)Q)NUT<~~""IDresdenUnitNo.2JL(1-P)LicenseeEventReport(RO50-237/1977-17)on4/13/77concetningtheba)iisolationvalveon"E"TraversingIncoreProbe.-'ystemGuideTub'efailingtoopenfromthecontrolroomasrequired.duringasurveillance'2-P)NOTE:IFPERSONNELEXPOSUREISINVOLVEDSENDDIRECTLYTOKREGER/J,COLLINSBRANCHCHEEP!W3CYSFORACTIONLICoASSTo:-W--,CYSACRSCYSRQE9%88SFORACTION/INFORMATIONdEG'RCPDRI&E(2MIPC.SCHROEDER/IPPOLITOHOUSTONNOVAK/CHECKGRIMESINTERNALDISTRIBUTIONBUTLERHANAUERTEDESCO/MACCARYEISENHUTBAERSHAOVOLLMER/BUNCHKREGER/JCOLLINSLPDR./E(TIC~EXTERNALDISTRIBUTIONCONTROMBER771NRCFORM196I2.76)

~VIV~I\I'(,

CommonwEdisonDresdenNuclearPowerStationR.R.g1Morris,Illinois60450Telephone815/942-2920BBSLtr.¹77-773Hay13,1977Hr.JamesG.Keppler,RegionalDirectorDirectorateofRegulatoryOperations-RaglogJIlDOCl(ggilaU.S.NuclearRegulatoryCommissionigegQ181O>Y799RooseveltRoa'dGlenEllyn,Illinois60137Fj/p'y)4leEnclosedpleasefindReportableOccurrencereportnumber50-237/1977-17.Thisreportisbeingsubmittedtoyourofficein.accordancewiththeDresdenNuclearPowerStationTechnicalSpecifications,Section6.6.B.8%,B.B.Stephenson/+StationSuperintendentDresdenNuclearPowerStationBBS:bcEnclosurecc:DirectorofInspection8EnforcementDirectorofHanagementInformationEProgramControlFile/NRC771600003.i, 00crPa'Iv41P(p1%K1PrJ'1IIlflt/

CONTROLBLOCKLICENSEEEVENTREPORTt.'"'PLEASEPRINTALLREQUIREDINFORMATION)6toa~]789UCENSEENAMEDRS201415LICENSENUMBER0-00000-0LICENSETYPE041111252630EVENTTYPE3132REPORTREPORTCATEGORYTYPESOURCE[oa~jcowo'7857585960EVENTDESCRIPTIONOOCKETNUMBER050-0237686961EVENTOATE41'77747580REPORTOATS051377[oO~Jraper,~q~oprobeTT.p78980[OD3]SstemGuideTubefailedtooenfromtheControlRoomasreuiredduringasurveillene.789t00~]TheremaininTIPballvalveswereexercisedsatisfactoril80errocedureDOS-,1600-8.78980ISincethevalvefailedintheclosedposition,primarycontainmentwasnotviolated.7'89toa~]789SYSTEMCAUSECOOSCOOECOMPONENTCODEgP]~~EVALEX78910'11217CAUSEDESCRIPTIONFAMECOMPONENTSUPPUERNG080VIGIATION(cont)N80[oaf789Jog789Qgmovinartsofthevalveandvalve789FACIUTYSTATUSPOWEROTHERSTATUSQ~g[pJ~oo789101213FORMOFACTMTYCOATENTRELEASEOOFRELEASEAMOUNTOFACTIVITYQ'5zzNA78910'1PERSONNELEXPOSURESEHLoloJoJLzJ789111213PERS'ONNELINJURIES7891112OFFSITECONSEQUENCES~15NA.".Ir789LOSSOROAMAGETOFACILITYTYPEOESCRIPTION~ZNA78910PUBLICITY~17NA789AOOITIONALFACTORSQ1gNA789METHOOOFOISCOVERY444546NAOISCOVERYOESCRIPTION45NALOCATIONOFRELEASEbod,causinminorinterferance,'(cont)80808080IHIo789NAME:PaulJ.KolbckMAY171977.Hxt.26560gpagIIlo607 4Chp EventDescrition(cont)shearvalvewouldhavebeenavilableasabackuptoassurePiimaryContainmentintegrihy.TheTIPballvalvesonbothDresdenUnits2and3werereplacedwi.thimprovedvalves'-in1975.Thisisthefirstfailureofthesevalvessincethatmodification(50-237/1977-17).CauseDescrition(cont)Thevalvewasinspectedandattemptsweremadetotroubleshoottheproblem.XtwastestedagainbutiCcontinuedtooperateerratically.Thevalvewasthenreplacedandthenewvalvetestedsatisfactorily.Thevalveisa1/4inchrotatingball,solenoidactuated,designedtosealagainsta0-125psigair-watermixture,manufacturedbyGeneralPneumaticCorporation,cat.no.608KWJ06revision3.

RECElVEO00CUHBlrPROCEsslÃCUHlrt9TfdugyNf@>g