ML20104B466

NPDES Noncompliance Notification:On 920904,discharge of Potassium Chromate Through Outfall 003 Occurred.Caused by CCW Sys Leaking Into Secondary Sys Blowdown Through Hx. Blowdown Sys Isolated & Sys Returned to Normal Operation

ML20104B466
Person / Time
Site:	North Anna
Issue date:	09/10/1992
From:	Marshall B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Kregloe W VIRGINIA, COMMONWEALTH OF
References
NUDOCS 9209150337
Download: ML20104B466 (2)

Text

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September 10, 1992 t'-

VIRGINIA POWER Mr. William L. Kregloc Virginia Water Control Board Valley Regional Office 116 North Main Street P. O. Box 268 Bridgewater, VA 22812 RE: NORTH ANNA POWER STATION, VPDES PERMIT NO. VA0052451 -

POTASSIUM CHROMATE DISCHARGE 9/4/92

Dear Mr. Kregloe:

A discharge of potassium chromate through Outrall 003 occurred at North Anna Power Station on September 4, 1992. This letter confirms the telephone report of the discharge to you by Mr. A. C. Cooke on that date. Potassium chromate is a CERCLA hazardous substance with a reportable quantit.y of ten pounds if released to the environment in a 24-hour period. This release did not meet or exceed the reportable quantity of ten pounds; therefore, this incident was not reported to the National Response Center or the Local Emergency Planning Committee.

Station personnel had been tracking a decline in the chromated component cooling water system for several days prior to September 4, 1992. At approximately 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> on September 4, it was determined that the component cooling water system was leaking into the secondary system blowdown through one of the heat exchangers.

This was allowing potassium chromate to be discharged into the station's discharge canal, which flows into the Waste Heat Treatment Facility, at a rate of 0.4 pounds per day through permit ed Outfall 003 (process water clarifier) . Station personnel immediately isolated the blowdown system and removed any residual through the drain system, which is processed by a demineralizer.

No detrimental environmental effects from this incident were detected. There are no known or anticipated acute or chronic health risks associated with this incident. The quantity of potassium chromate involved in this event would not result in a detectable concentration in the discharge to Lake Anna from the Waste Heat Treatment Facility.

The leak in the heat exchanger system has been identified and corrected and the blowdown system has been returned to norma 1 operation. In order to preclude future recurrence of this l I

incident, an investigation has been initiated to determine what caused the leak.

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Mr. William L. Kregloe 3

September 10, 1992 Page 2

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

sincerely,

• f .' ljh.a B. . arshall, P.E.

Manager Water Quality ccr U.S. Nuclear Regulatory Commission Region-II 101 Marietta St., NW Suite 2900 Atlanta, GA 30323 Ret North Anna Units 1 & 2 Docket Hos. 50-338/50-33P License Nos. NPF-4/dPF-7 i

U.S. Nuclear Regulatory Commission  ?

Document Control Desk Washington, DC 2G555 Re: North Anna Unita 1 & 2 Docket Nos. 50-338/50-339 License-Nos. NPF-4/NPF-7 Mr. M. S. Lesser NRC Senior Resident Inspector North Anna Power Station 1

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