05000324/LER-1981-061-03, /03L-0:on 810629,during Test,Diesel Generator Failed to Develop Generator Field Voltage.Caused by Failed Electrical Coil in Field Shorting Device 17 Preventing Generator Field from Flashing When Diesel Started

/03L-0:on 810629,during Test,Diesel Generator Failed to Develop Generator Field Voltage.Caused by Failed Electrical Coil in Field Shorting Device 17 Preventing Generator Field from Flashing When Diesel Started

ML20009F478
Person / Time
Site:	Brunswick
Issue date:	07/21/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F475	List: 05000324/LER-1981-061, Forwards LER 81-061/03L-0 05000324/LER-1981-061-03, /03L-0:on 810629,during Test,Diesel Generator Failed to Develop Generator Field Voltage.Caused by Failed Electrical Coil in Field Shorting Device 17 Preventing Generator Field from Flashing When Diesel Started
References
LER-81-061-03L, LER-81-61-3L, NUDOCS 8107310216
Download: ML20009F478 (2)

LER-1981-061, /03L-0:on 810629,during Test,Diesel Generator Failed to Develop Generator Field Voltage.Caused by Failed Electrical Coil in Field Shorting Device 17 Preventing Generator Field from Flashing When Diesel Started

Event date:
Report date:
3241981061R03 - NRC Website

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EVENT DATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h l o 12 l l During the performance of Diesel Generator Actual Loading Test, PT 12.1.1, No. 4 l

Diesel Generator started as required but did not develop generator field voltage.

l lo i3 J l 10141 l This test simulates a loss of off-site power in conjunction with an ECCS test signal. l This event did not affect the health and safety of the public.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND COR3ECTIVE ACTIONS ll1 l o l l A f ailed electrical coil in the diesel generator's field shorting dev1 e, No. 17, I

1iIi1 I crevented the generator field from flashing when the diesel started.

The coil. Model I l i 121 1 No. 9103B, was reolaced and the PT was successfully cerformed.

No cause was deter-l 2 1i131 I mined for the failed coil. Plant documentation shows.no historv of orevious similar l

l i 14 I l coil failures, therefore this failure has been attributed to a random failure.

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" J. Pastva, Jr.

(919) 457-9521 2

l NAM OF PRMPAR$R PHONE:

LER ATI'ACHMENT - RO #2-81-61 Facility: BSEP Unit No. 2 Event Date: 06/29/81 During the initial performance of the periodic test (PT), No. 4 diesel generator did not develop generator field voltage because a f ailed electrical coil in the generator's field shorting device No. 17 prevented the contacts from opening.

This device is designed to short the generator's electrical field when t's diesel is not running. When the diesel is started, the device's coil is energized to open electrical contacts and allow the generator field to flash.

Whenever a diese'. trip is initiated, the device's coil is again energized and the contacts are closed thus ollapsing the generator's field. An inspection of this coil e- *.he remaining three diesel genera:ars did not reveal any problems.

No specific cause could be determined for the coil failure.

This event is considered to be isolated requiring no further corrective action.

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