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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Certified Mail s 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 l

discharge canal was conducted but no- analytical data were-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 DR ADOCK O 3 B,;

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Mr. William.L. Kregloel "

February 21, 1991 'I Page 2-

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

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

Sincerely,- - ,

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B..M. Marshall, P. . .

Manager-Water Quality- ,

t cc: U.S. NRC-Docket lo.- 50-338/50-339-

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-101'Marietta-St., NW >

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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