ML19347C746

RO:801121 Fire Diesel 1-2 Removed from Svc to Determine Cause of Failure to Start Automatically on Decrease in Sys Pressure.Caused by Failure of Corrosion Resistor Element in Cooling Water Line Resulting in Diesel Overheat

ML19347C746
Person / Time
Site:	Oyster Creek
Issue date:	12/17/1980
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
50-219-80-1, NUDOCS 8101050379
Download: ML19347C746 (2)

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• Q OYSTER CREEK NUCLEAR GENERATING STATION P MJ-: M I [r V]

"**'f uneg'gg c"L"3.,.,o s-..

(609) 693-1951 P.O. BOX 388

• FORKED RIVER

• NEW JERSEY

• o8731 December 17, 1980 ,

Mr. Boyce H. Grier Office of Inspection and Enforcemens U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Pruss 3, Pennsylvania 19406

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Special Report - Degraded Fire Suppression Water System In accordance with the Oyster Creek Operating License DPR-16, Appendix A sect'.on 3.12.B.2 and 6.9.3.d, the following special report is submitted concerning a loss of redundancy in the Fire Suppression Water System at the Oyster Creek Station. _

Very truly yours, M _

Ivan R. Finfro ,; .

Vice Presiden Generation IRF:dh -

Enclosure 8103 Olio 37i J . . .-. . _ . .. . _ .

, l 0YSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Special Report No. 50-219/80-1 Report Date December 17, 1980 Occurrence Date

, November 21, 1980 through November 29, 1980 Identification of Occurrence A loss of redundancy occurred in the Fire Suppression Water System which exceeded the 7 day period specified in Technical Specifications, Paragraph 3.12.B.2.

This event is considered to be reportable under the provisions of Technical Specifications, paragraph 6.9.3.d.

Descriotion of Occurrence On Friday, November 21, 1980, at approximately 3:00 PM, Fire Diesel 1-2 was removed from service to determine the cause of a failure to automatically start on a decrease in system pressure. The initial investigation revealed that there was a large amount of anti-freeze on the floor adjacent to the engine and that the starter motor for the diesel was inoperable. Cummins Metropolitan Company, manufacturer of the diesel engine, was contacted to procure a new starter motor and to provide a representative to determine the cause of the incident.

Aoparent Cause of Occurrence On November 25, 1980, it was determined that the corrosion resistor element in the cooling water line to 1-2 Fire Diesel had failed resulting in a loss of engine cooling water which caused the diesel to overheat. This condition led to the failure of a number of seals between the engine cylinder liners and the water jacket allowing water to enter the crankcase when water was added to the radiator. Consequently, the engine seized up and when it attempted to start, the starter motor burned out.

Corrective Action Repair parts were ordered on a expedited basis and repair crews were organized to work continuously until repairs were completed. The NRC site representative l was made aware of the circumstances and arrangements were initiated to provide a temporary fire pump should it become necessary. Through the diligent efforts of the Cummins representatives and the repair crews, Fire Diesel 1-2 was returned to service on November 29,1980 at 12:50 PM.

On November 28, 1980, daily surveillance was initiated on the operable fire diesel to provide for the loss of redundancy in the system.

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