05000324/LER-1981-033-03, /03L-0:on 810224,diesel Unavailable Annunciator Received for Diesel Generator 4.Caused by Diesel Jacket Water Heater Power Supply Contractor Stuck in Energized Position,Resulting in Jacket Water Temp Over Setpoint

/03L-0:on 810224,diesel Unavailable Annunciator Received for Diesel Generator 4.Caused by Diesel Jacket Water Heater Power Supply Contractor Stuck in Energized Position,Resulting in Jacket Water Temp Over Setpoint

ML19350C733
Person / Time
Site:	Brunswick
Issue date:	03/24/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350C723	List: 05000324/LER-1981-033, Forwards LER 81-033/03L-0 05000324/LER-1981-033-03, /03L-0:on 810224,diesel Unavailable Annunciator Received for Diesel Generator 4.Caused by Diesel Jacket Water Heater Power Supply Contractor Stuck in Energized Position,Resulting in Jacket Water Temp Over Setpoint
References
LER-81-033-03L, LER-81-33-3L, NUDOCS 8104060642
Download: ML19350C733 (2)

LER-1981-033, /03L-0:on 810224,diesel Unavailable Annunciator Received for Diesel Generator 4.Caused by Diesel Jacket Water Heater Power Supply Contractor Stuck in Energized Position,Resulting in Jacket Water Temp Over Setpoint

Event date:
Report date:
3241981033R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION NRC PC.

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6 EVENT OESCRIPTION AND PROS ABLE CONSEQUENCES h ITTTI I hile performing normal RTGB surveillance, a " Diesel Unavailable" annunciator was I

W An iC=ediate investigation of the annunciator j

g ; received for No. 4 diesel generator.

h jacket water temperature.

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g l revealed that the diesel had a local lockout due to hAi go,33 ;The No. 4 diesel generator was then declared inoperable in accordance with technical l

goggy l specifications. This event did not affect the health or safety of the public.

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I g lThe diesel jacket water heater oower supoly contactor had stuck in the enereized

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g l lockout setpoint.

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g loperability and returned to normal availabilitv.

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LER ATTAC10fENT - LER NO. 2-81-33 Facility: BSEP Unit No. 2 Date:

2-24-81 An investigation of the problem revealed that the General Electric Model No. CR206E000AAFN, 480V, ND!A size 3 contactor was energized at a tem-perature greater than the high temperature lockout. Manual operation of this contactor determined that it was extremely difficult to operate. This contactor was replaced and the system returned to normal. The defective contactor was disassembled and inspected in an attempt to determine the cause for its stiffness. A thorough inspection could not determine a cause for this event. The contactors on the remaining three diesel generators were tested and found to operate satisfactorily. This is considered an isolated event.

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