05000302/LER-1981-046-03, /03L-0:on 810714,during Normal Operation 120 Ac Vital Bus 3 Was de-energized When Power Was Interrupted at a Inverter.Caused by Station Battery Shorting During Maint Causing a Inverter to Fail

/03L-0:on 810714,during Normal Operation 120 Ac Vital Bus 3 Was de-energized When Power Was Interrupted at a Inverter.Caused by Station Battery Shorting During Maint Causing a Inverter to Fail

ML20010C540
Person / Time
Site:	Crystal River
Issue date:	08/12/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C526	List: 05000302/LER-1981-046, Forwards LER 81-046/03L-0 05000302/LER-1981-046-03, /03L-0:on 810714,during Normal Operation 120 Ac Vital Bus 3 Was de-energized When Power Was Interrupted at a Inverter.Caused by Station Battery Shorting During Maint Causing a Inverter to Fail
References
LER-81-046-03L, LER-81-46-3L, NUDOCS 8108200174
Download: ML20010C540 (2)

LER-1981-046, /03L-0:on 810714,during Normal Operation 120 Ac Vital Bus 3 Was de-energized When Power Was Interrupted at a Inverter.Caused by Station Battery Shorting During Maint Causing a Inverter to Fail

Event date:
Report date:
3021981046R03 - NRC Website

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60 of DOCK ET NUMBER 68 69 EVENT DATE 14 lb HEPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o [ 2 l l At 0954 during normal operation 120 A.C. Vital Bus #3A was de-eneroined when power an]

go;3; j interrupted at tha "A" inverter. This created an event contrary to T.S.3.8.2.1.

An QTT] la result of this event.a Reactor / Turbine trip occurred.

Power was restor ed to 1-he l

lol3l l Vital Bus within ten minutes. There was no effect utx>n the health or safety of the 1

[ o lc,1 l general public. This was the first event of this type.and this is the fif t h event-l l 017 l l reported under this specification.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i j o l lThe cause of this event is attributed to inadvertent shorting of the "A" Station l

[ Battery during maintenance resulting in failure of the "A"

Inverter which was supplying l i i

[ power to the Vital Bus.

THe inverter was repaired. Mainten ce in the battery room l

, j [ij3l lwill utilize tools with insulated handles,and of a length designed to prevent shorting l [and caution signs will be posted at the entran(.e.

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SUPPIDENTARY INFORMATION.

L Report #50-302/81-046/03Ir0 Facility:

Crystal River Unit 3

' Report Date:

' August '12,1981.

Occurrence Date:

July; 14,1981

- Identification of. Occurrence:

120 Volt A.C.

Vital Bus #3A was inoperable contrary. to

Technical Specifica* ion 3 8.2.1.

Conditions Prior to Occurrence:

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Mode 1 - Power Operation (8Q$)

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Description of Occurrence:

At 0954 during normal operation,120 volt A.C._ Vital Bus #3A was de-energized.

- The "A"

station battery was. shorted during maintenance which blew the output fuse of the "A" inverter which supplied the bus.

As a result of the lost bus the interface' valve for the turbine generator. control 3

fluid opened causing a loss of control fluid resulting in a Turbine / Reactor trip.

Power was restored to the Vital Bus within ten (10) minutes.

Designation of Apparent Cause:

L The cause of. this event is attributed.to a personnel error j

resulting in the short to the battery.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Correctivr, Action:

The "A" Inverter was repaired.

Tools with insulated handles and of a length designed to prevent shorting will be

'obtained for exclusive use in the

_ Battery _ Room.

Additionally, a sign will be installed on the - door to - the Battery Room to.. provide sensitive equipment caution to persons entering.

Failure Data:

L-

' This was the-first event of this type,and this. is the fifth event reported under this specification.

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