ML20066J272

NPDES Noncompliance Notification:On 910217.product Level in Chemical Storage Tank Significantly Reduced Due to Failure of Level Indication Sys Which Allowed Siphoning of Stored Water Treatment Chemical to Discharge

ML20066J272
Person / Time
Site:	North Anna
Issue date:	02/21/1991
From:	Marshall B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Kregloe W VIRGINIA, COMMONWEALTH OF
References
NUDOCS 9102260042
Download: ML20066J272 (2)

Text

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Return Receiot Recuestdd vinor m s'o m n February 21, 1991 Mr. William L. Kregloe Virginia Water Control Board.

f Valley Regional Office 5

116 North Main. Street P.O.

Box 268-Bridgewater, VA 22812 RE:

UNUBUAL DISCHARGE - NORTH ANNA POWER STATION

Dear Mr. Kregloe:

On February 17, 1991 at 3:50 p.m. the Virginia Office of Emergency Services was notified of an unusual discharge at our '. North ? Anna Power Station. - The Water Board prep officer called G...R. Knauer of my staff later Sunday afternoon to verify the: report. This letter-confirms our notification and provides additional 'information regarding the incident.

Around 4 a.m. on Sunday, February-17, station personnel discovered that the product level in a chemical storage tank was.significantly reduced. The. level indication system had failedt allowing for siphoning of the stored water treatment chemical to a turbine building sump. This sump discharges through Outfall 004-into the discharge canal. The water treatment chemical'is a Calgon product PCL-713, which is a combination of organic and inorganic phosphates along with a dispersant for silt and other inorganic deposits. This product is used for corrosion control in the bearing cooling:

system. Approximately 300 gallons of product'were discharged, as.

determined by comparison of the residual product to the immediately l

previous level reading.

There was no apparent adverse impact on aquatic life or the natural environment as a result of this discharge. Visual inspection of the discharge canal was conducted but no-analytical data were-l'-

collected.

After evaluation of the incident, station personnel. have concluded that a future incident can be avoided by valving out the level indicator tube when it is not in use. This change in operating procedures is being implemented.

9102260042 910221]

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i Mr. William.L. Kregloel February 21, 1991

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~ If you have any questions regarding-' this / incident, please. call-Ms'.

Gleness Knauer of my staff.atl 273-2996..

Sincerely,-

i f

B..M. Marshall, P.

Manager-Water Quality-t cc:

U.S. NRC-Docket lo.- 50-338/50-339-

-101'Marietta-St., NW

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x Suite-2900 Atlanta,.GA-30323 U-S;"NRC2

. ATTN:i-Docket 4 Control; Desk!.

Docket No.c 50-338/50-339 Washington,aD.C.:205554: ' "

NRC. Senior Resident. Inspector

- Docket No. 50-338/50-339

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- North Anna' Power Station

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