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:Commonwealth EdisonComp'anyMorris,IllBoBoStephensen NRCbFORM195U.S.NUCLEARREGULATORY CSSION--12.76)--~-NRCDISTRIBUTION FORPART50DOCKETMATERIALDOCKETNUMBER95-49FILENUMBERINCIDENTREPORTDATEOFDOCUMENT5/13/77DATERECEIVED6/8/77PfLETTEREfoRIlIINAL

,OCOPYDESCRIPTION 0NOTORIZE0gkJNCLASSIFIED tPROPa~'aINPUTFORMENCLOSURE NUMBEROFCOPIESRECEIVEDI&idQCDIIl~C~QQ'i7aa~~

~Iihgg)gag:j)Q)NUT<~~""IDresdenUnitNo.2JL(1-P)LicenseeEventReport(RO50-237/1977-17) on4/13/77concetning theba)iisolation valveon"E"Traversing IncoreProbe.-'ystemGuideTub'efailingtoopenfromthecontrolroomasrequired.

duringasurveillance'2-P)

NOTE:IFPERSONNEL EXPOSUREISINVOLVEDSENDDIRECTLYTOKREGER/J, COLLINSBRANCHCHEEP!W3CYSFORACTIONLICoASSTo:-W--,CYSACRSCYSRQE9%88SFORACTION/INFORMATION dEG'RCPDRI&E(2MIPC.SCHROEDER/IPPOLITO HOUSTONNOVAK/CHECK GRIMESINTERNALDISTRIBUTIONBUTLERHANAUERTEDESCO/MACCARY EISENHUTBAERSHAOVOLLMER/BUNCH KREGER/JCOLLINSLPDR./E(TIC~EXTERNALDISTRIBUTION CONTROMBER771NRCFORM196I2.76)

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CommonwEdisonDresdenNuclearPowerStationR.R.g1Morris,Illinois60450Telephone 815/942-2920 BBSLtr.¹77-773Hay13,1977Hr.JamesG.Keppler,RegionalDirectorDirectorate ofRegulatory Operations

-RaglogJIlDOCl(ggilaU.S.NuclearRegulatory Commission igegQ181O>Y 799Roosevelt Roa'dGlenEllyn,Illinois60137Fj/p'y)4leEnclosedpleasefindReportable Occurrence reportnumber50-237/1977-17.

Thisreportisbeingsubmitted toyourofficein.accordance withtheDresdenNuclearPowerStationTechnical Specifications, Section6.6.B.8%,B.B.Stephenson

/+StationSuperintendent DresdenNuclearPowerStationBBS:bcEnclosure cc:DirectorofInspection 8Enforcement DirectorofHanagement Information EProgramControlFile/NRC771600003

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CONTROLBLOCKLICENSEEEVENTREPORTt.'"'PLEASE PRINTALLREQUIREDINFORMATION) 6toa~]789UCENSEENAMEDRS201415LICENSENUMBER0-00000-0LICENSETYPE041111252630EVENTTYPE3132REPORTREPORTCATEGORYTYPESOURCE[oa~jcowo' 7857585960EVENTDESCRIPTION OOCKETNUMBER050-0237686961EVENTOATE41'77747580REPORTOATS051377[oO~Jraper,~q~oprobeTT.p78980[OD3]SstemGuideTubefailedtooenfromtheControlRoomasreuiredduringasurveillen e.789t00~]TheremaininTIPballvalveswereexercised satisfactoril 80errocedureDOS-,1600-8.

78980ISincethevalvefailedintheclosedposition, primarycontainment wasnotviolated.

7'89toa~]789SYSTEMCAUSECOOSCOOECOMPONENT CODEgP]~~EVALEX78910'11217CAUSEDESCRIPTION FAMECOMPONENT SUPPUERNG080VIGIATION (cont)N80[oaf789Jog789Qgmovinartsofthevalveandvalve789FACIUTYSTATUSPOWEROTHERSTATUSQ~g[pJ~oo789101213FORMOFACTMTYCOATENTRELEASEOOFRELEASEAMOUNTOFACTIVITYQ'5zzNA78910'1PERSONNEL EXPOSURES EHLoloJoJLzJ789111213PERS'ONNEL INJURIES7891112OFFSITECONSEQUENCES

~15NA.".Ir789LOSSOROAMAGETOFACILITYTYPEOESCRIPTION

~ZNA78910PUBLICITY

~17NA789AOOITIONAL FACTORSQ1gNA789METHOOOFOISCOVERY 444546NAOISCOVERY OESCRIPTION 45NALOCATIONOFRELEASEbod,causinminorinterferance,

'(cont)80808080IHIo789NAME:PaulJ.KolbckMAY171977.Hxt.26560gpagIIlo607 4Chp EventDescrition(cont)shearvalvewouldhavebeenavilableasabackuptoassurePiimaryContainment integrihy.

TheTIPballvalvesonbothDresdenUnits2and3werereplacedwi.thimprovedvalves'-in 1975.Thisisthefirstfailureofthesevalvessincethatmodification (50-237/1977-17).

CauseDescrition(cont)Thevalvewasinspected andattemptsweremadetotroubleshoottheproblem.XtwastestedagainbutiCcontinued tooperateerratically.

Thevalvewasthenreplacedandthenewvalvetestedsatisfactorily.

Thevalveisa1/4inchrotatingball,solenoidactuated, designedtosealagainsta0-125psigair-water mixture,manufactured byGeneralPneumatic Corporation, cat.no.608KWJ06revision3.

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