05000324/LER-1981-044-03, /03L-0:on 810429,during Normal Operation,High Jacket Water Temp Trip Occurred in Diesel Generator 4.Caused by Stuck Closed Electrical Contacts in Diesel Jacket Water Heater Temp Controlling Relay.Relay Replaced

/03L-0:on 810429,during Normal Operation,High Jacket Water Temp Trip Occurred in Diesel Generator 4.Caused by Stuck Closed Electrical Contacts in Diesel Jacket Water Heater Temp Controlling Relay.Relay Replaced

ML20004C268
Person / Time
Site:	Brunswick
Issue date:	05/28/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004C265	List: 05000324/LER-1981-044, Forwards LER 81-044/03L-0 05000324/LER-1981-044-03, /03L-0:on 810429,during Normal Operation,High Jacket Water Temp Trip Occurred in Diesel Generator 4.Caused by Stuck Closed Electrical Contacts in Diesel Jacket Water Heater Temp Controlling Relay.Relay Replaced
References
LER-81-044-03L, LER-81-44-3L, NUDOCS 8106020457
Download: ML20004C268 (2)

LER-1981-044, /03L-0:on 810429,during Normal Operation,High Jacket Water Temp Trip Occurred in Diesel Generator 4.Caused by Stuck Closed Electrical Contacts in Diesel Jacket Water Heater Temp Controlling Relay.Relay Replaced

Event date:
Report date:
3241981044R03 - NRC Website

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Lola,j i Durion normal plant operation a No. 4 diesel generator lockout was received due to All the remaining dieselI l Jacket water high temperature and low pressure trip signals.

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' Facility: BSEP Unit No. 2 Event Date: April 29, 1981 During the investigation of this event it was discovered that the high jacket.

water temperature trip had occurred as a result of stuck closed electrical contacts in the jacket water. heater temperature controlling relay.' An in-spection of the relay revealed an accumulation of dirt and dust in the slider assembly of the relay which prevented the contacts from reopening following detection of a normal Jacket water temperature. As a result of the stuck contacts, the jacket water temperature increased beyond the high temperature lockout setpoint.

The relay was replaced and the jacket water heater was observed to be operating properly. No cause was determined for the low pressure lockout which was received. An inspection of the. Emergency Control Relay (ECR),

Start Time Relay (STR), Start Counter. Relay' (SCR), and the. Jacket Water Low Pressure Trip Relay (JVPSCR) did not reveal any problems or symptoms that would indicate any problem which could have caused the pressure trip lockout. The jacket water high temperature and low pressure trips were then reset which returned the diesel to normal standby readiness.

Since there is no known previous failure history for this relay, this event is considered to be an isolated case and no further action is planned at this time.

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