ML20086N473

Confirms 911211 Telcon Notification Made by D James Re Failure of Sewage Lift Station at Plant.Failure Due to Electrical Malfunction of Turbine Bldg Sewage Lift Station. Sewage Flow Immediately Stopped & Repairs Made to Lift

ML20086N473
Person / Time
Site:	North Anna
Issue date:	12/16/1991
From:	Marshall B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Kregloe W VIRGINIA, COMMONWEALTH OF
References
NUDOCS 9112230022
Download: ML20086N473 (2)

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William L. Krogloe Valley Regional Office Virginia Water Control Board 116 North Main Street Bridgewater, VA 22812 RE: NORTH ANNA POWER STATION - SEWAGE PUMP FAILU;Y

Dear Mr. Kregloe:

This is to confirm the December 11, 1991, telephone notification made to you by Mr. Daniel James regarding failure of a sewage lif t station at the North Anna Power Station. At about 9:30 a.m. that day, an electrical malfunction of the Turbine . Building sewage lift station caused an overflow of approximately 5 to 10 gallons of raw i

sewage into the building's sump.

At the time of the sewage overflow, the Turbine Building sump was full and was discharging through an oil / water separator via Outfall 004. Therefore, it is possible that the discharge contained a small amount of the untreated sewage. However, since the sump discharge rate is typically about 0.5 MGD. the entire 5 to 10 gallons of sewage, if discharged, would have constituted a very minute portion of that flow.

The sewage flow was immediately stopped and repairs made to the lift station. The unit was back into operation by 11:00 p.m. on December 11. No evidence of any unusual discharge was found in the outfall canal and no detrimental environmental impact would be expected from this event. No additional samples were taken; the large volume of the sump discharge (estimated at 10,000 gal.) would make the small volume of sewage undetectable.

Should you need additiont.) taformation or have any questions about this matter, please conta L :M tiel James at 273-2996.

Sincerely,

< 1 ff>

B. M. arshall, P.E.

Manager Water Quality 91122300522 911216 M

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) -y William L. Kregloe December 16, 1991 Page 2 cc U.S. NRC Docket No. 50-338/50-339 101 Marietta Street, N.W.

Suite 2900 Atlanta, GA 30323 U.S. NPC Attn: Docket Control Desk Docket No. 50-318/50-339 Washingtons, DC 20555 ,

NRC Resident Inspector Docket Po. 50-338/50-339 North Anna Power Station t

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