05000318/LER-1981-002-03, /03L-0:on 810108,diesel Generator 12 Started Automatically.Possibly Caused by Control Relays in Abnormal State.Generator Reset & Tested

/03L-0:on 810108,diesel Generator 12 Started Automatically.Possibly Caused by Control Relays in Abnormal State.Generator Reset & Tested

ML19339D104
Person / Time
Site:	Calvert Cliffs
Issue date:	02/06/1981
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339D100	List: 05000318/LER-1981-002, Forwards LER 81-002/03L-0 05000318/LER-1981-002-03, /03L-0:on 810108,diesel Generator 12 Started Automatically.Possibly Caused by Control Relays in Abnormal State.Generator Reset & Tested
References
LER-81-002-03L-01, LER-81-2-3L-1, NUDOCS 8102170260
Download: ML19339D104 (2)

LER-1981-002, /03L-0:on 810108,diesel Generator 12 Started Automatically.Possibly Caused by Control Relays in Abnormal State.Generator Reset & Tested

Event date:
Report date:
3181981002R03 - NRC Website

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60 61 DOCKET NUMSER 68 63 EVENT DATg 14 75 REPORT QATE 83 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 1 At 1106. #12 Diesel Generator started automatically for no annarent I

to tal I reason. At 1121. #12 Ofesel Generator was stooted and a start failure I

lo I Ai I alarm was received. The Diesel was declared inocerable and the redun-1 iTm I dant power sources verified per T.S. 3.8.1.1.

1. 12 Diesel Generator was I

Io is i i returned to service at 1430. Unit I was shutdown in Mode 5.

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mI revealed no failures, arounds. nor im1rocer oersonnel actinne. unwavar.

I it i ei i some control relays were discovered in an abnorma' state. When reset i

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Inves-1 iiiA i i tigation is continuino.

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50-313 LICENSE NO.

DPR-69 EVENT DATE 01-08-81 REPORT DATE 02-06-81 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)

Immediate troubleshooting efforts disclosed abnormal control relay states, with #12 Diesel Generator Start relays in a condition calling for diesel start and the Start Failure relay actuated giving a diesel shutdown signal.

No initiating devices were found actuated. No circuit grounds nor faults were detected. Maintenance personnel reset control relays and the diesel was test run repeatedly with satisf actory results.

Circuit analysis by plant personnel has revealed no obvious means of causing event Indications as they occurred. Investigation to date has also included comparisons of maintenance records, surveillance records, plant computer alarm logs, and operator logs for indications of abnormal conditions or activities contributing to the event. This investigation is continuing. Additional troubleshooting may be required. A final report will, therefore, be prepared and ferwarded by March 1,1931.

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