ML17309A154

LER 81-007/03L-0:on 810418,loss of 34.5-kV Supply to Transformer 12 Occurred,Creating Loss of Offsite Power. Caused by Fault in B Phase Vacuum Breaker Switch Which Supplies Spare Transformer 12B

ML17309A154
Person / Time
Site:	Ginna
Issue date:	05/11/1981
From:	EDGAR C ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17258B043	List: ML17258B042 ML17258B044 ML17309A154
References
LER-81-007-03L, LER-81-7-3L, NUDOCS 8105180308
Download: ML17309A154 (4)

Text

LER81-007/3L-0 LICENSEEEVENTREPORTCAR13001)3)4)7)8)10)ControlBlock:LicenseType:I4',1'1,',1',1',DocketNumber:I0I50002EventDate'IOI11II11EventDescription andProba2)LicenseeCode'.'N'Y',R',E',G 0I0'0I-I0I0',5Cat:II/6)ReportSource9ReportDate'0'5'1111811 IbleConsequences:

~ILI~IIeIDurinsteadystateoperation alossofthe34.5KVsupplytofINo.12transformser occuredcreatingalossofoffsitepower/,toannatation.iscreatedalossofpowerto1Iussesand1andsaeguarbussesan11.Emergency D/G's1Aand1Bstartedonundervoltage signalIIandsuppliedpowertotheOVsafeguard busses.Thetemporary IIinterruption totheowersupplyforthe1Binstrument bus11)14)17)18)21)23)25)27)SystemCode'EAI12)CauseCode:',E',13)CauseSubcode:IAIComp.Code:/,~C/K/T/BIRIKI 15)Subcode;/X/16)ValveCode:jZ/~'-7'/'ction Taken:IX'19)FutureAction:',Z',20EffectonPlant:',B',ShutdownMethod:IZI22)Houls'0I010I5IPrimeComponent Supplier:

ILI26)Manufacturer:

',J',1'I~2,0',

CauseDescription andCorrective Actions:',Thecausewasidentified toafaultinthe"B"Phasevacuumf',breaker switchwhichsuppliesthe12Bsparetransformer.

,The12transformer wasisolatedfromthe3.5KVbusandpower>',wasrestoredtotheNo.12transformer.

Thesafeuardbusses',,weretransferred bactoteirnormalsupplyandtheemerpency',

',DieselGenerators secured.28)30)31)32)33)35)36)37)39)40)41)42)43)44)45)FacilityStatus:',E',OtherStatus:1N/A1MethodofDiscovery:

IAIDiscovery Description~IOperator ObActivityReleased:

IZI3ContentAmountof'ctivity:,I/A ILocationofRelease:/N/AlPersonnel Exposures Number:100I0IDescription:

',N/AIPersonnel InjuriesNumber:',0',0',0',

==

Description:==

IN/AILossoforDamagetoFacility:

IZIDescription:

IN/AIPublicity Issued:INIDescription:

/N/AlIOI9I5Iservationi ofRelease:IZI38)Exposures Type:',Z',NRCUSEONLYNameofPreparer:

ClairEdgarPhone:315-524-4446 x248

ATTACHMENT TOLERFORM10)EventDescription andProbableConsequences contd:'causednumerousalarmsandanapproximate 105runbackto',5nuclearpower.Conditions werestablized byoperationsI

<personnel andplantoerationcontinued.

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