ML20059G925

NPDES Noncompliance Notification:On 931101,determined That Approx .7 Lb of Cr-04 Released Per Day Through Clarifier Discharge Point (Outfall 003).Caused by Leak in Closed Ccs. Leaking Equipment Isolated & Repairs Made

ML20059G925
Person / Time
Site:	North Anna
Issue date:	11/05/1993
From:	Marshall B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Loyd K VIRGINIA, COMMONWEALTH OF
References
NUDOCS 9311090188
Download: ML20059G925 (2)

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• . t len Atten nrguna JVu>ro November 5, 1993 VIRGINIA POWER Mr. Kemper Loyd Valley Regional Office Department of Environmental Quality 116 North Main Street i P. O. Box 268  ;

Bridgewater, VA 22812  :

RE: NORTH ANNA POWER STATION - VPDES PERMIT NO. VA0052451 UNUSUAL DISCHARGE f

Dear Mr. Loyd:

As Mr. Daniel James of my staff discussed with Bill Kregloe by >

telephone on November 2, 1993, the North Anna Power Station experienced an unusual discharge of chromate to the clarifier from a leak in the component cooling system. The clarifier discharges to the circulating water tunnel via Outfall 003.  !

On the late afternoon (1745) of Monday, November 1,1993 Operations

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personnel discovered a leak in the closed component cooling system.

i This leak was determined to be sending 160 gallons per day through the clarifier discharge point (Outfall 003) . This discharge was l immediately shut down and the system repaired. It was calculated that approximately 0.7 lbs. of chromate (Cr04) had been released <

per day. The release had been occurring for several days but it is  !

impossible to determine exactly how long because, during the  !

recently completed unit refueling, parts of the component cooling  ;

system were drained into tanks to allow work on various systems.  :

It was not until the unit was back on line and the component cooling system stabilized that the leak was evident and it was then I traced to a steam generator blowdown vent condenser. During the j time of the release, the clarifier was also discharging water from other sources which would have given a clarifier discharge chromate (Cr04) level of from 0.37 to 0.54 parts per million.

Normally, any leaks from the component cooling system are routed through ion exchange treatment to remove chromate prior to discharge to the clarifier. Immediately upon discovering the leak, the leaking equipment was isolated to prevent further discharge of chromate to the clarifier and the necessary repairs were made. The systems were returned to normal operation by the morning of November 2.

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, i Mr. Kemper Loyd November 5, 1993 Page 2 No other contaminants were involved and no violations of any permit limitations occurred. Site visual inspections revealed no evidence of environmental damage in the station's discharge canal or the waste heat treatment facility. The chromate present in the water discharged would not be expected to be detectable in the discharge canal or the waste heat treatment facility, and would have no impact on water quality in the canal, the waste heat treatment facility, or at the station's discharge to state waters.

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This event was due to an unforeseeable failure of equipment. The l appropriate actions were taken to cease the unusual discharge and to make the necessary repairs. No further corrective actions are l needed. '

Should you desire additional information or have any questions i about this matter, please contact Daniel James at (804) 273-2996.

l Sincerely, ,

4%>4 B. M. Marshall, P.E.

Manager ,

l Water Quality )

cc: U.S. Nuclear Regulatory Commission 1 l Region II  ;

101 Marietta St., NW Suite 2900 Atlanta, GA 30323 )

Re: North Anna Units 1 & 2 Docket Nos. 50-338/50-339 License Nos. NPF-4/NPF-7 i EU;SD Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Re: North Anna Units 1 & 2 Docket Nos. 50-338/50-339 License Nos. NPF-4/NPF-7 i

Mr. R. D. McWhorter l NRC Senior Resident Inspector North Anna Power Station i

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