ML20080M084

NPDES Noncompliance Notification:On 941202,chlorination Sys Exceeded Two H Per Day Limit for Total Residual Oxidants Due to Improper Timer Setting & on 941219,sewage Line Upset Occurred South of Holddown Area Due to Blockage in Line

ML20080M084
Person / Time
Site:	San Onofre
Issue date:	01/27/1995
From:	Newton H SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20080M059	List: ML20080M057 ML20080M084
References
NUDOCS 9503030115
Download: ML20080M084 (2)

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.. ~* Southem Califomia Edison Company P. O. BOX 12e SAN CLEMF.NTE. CALIFORNIA 92674 L

H.W. NEWTON M EN ONE mm.., ,

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January 27,199'S Mr. Arthur L. Coe ->

j Califomia Regional Water Quality Control Board {

San Diego Region )

9771 Clairemont Mesa Blvd., Suite B  !

San Diego, California 92124-1331 ,

SUBJECT; NPDES Discharge Monitoring Report San Onofre Nuclear Generating Station, Unit 3 l l

l The NPDES Discharge Monitoring Report (DMR) for San Onofre Unit 3 covering the month of l December is submitted in accordance with the requirements of order No. 94-50 (NPDES Permit l No. CA 0108081). A summary of the generating unit's status and significant analytical results is provided below.  ;

The unit was in operation all month and all sampled water sources were found to be within permit i limits.  !

On December 2,1994 the chlorination system on Unit 3 operated for two hours and two minutes.

This exceeded the two hour per day limit in the NPDES permit for total residual oxidants. An -

improper timer setting in the chlorination system resulted in the two minute exceedence. Actions have been taken to verify timer settings in the future to prevent reoccurrence.

f At 1230 on December 19,1994, a sewage line upset occurred south of the Unit 3 holddown area.

Blockage in the line resulted in an overflow of approximately 50 gallons of raw sewage into the yard drain system. The area of the spill was disinfected with 5 gallons of sodium hypochlorite.

After disinfection, the sewage spill went through the yard drain system to the Unit 3 outfall. Greg Peters ofyour staff was notified about the incident at approximately 1505 that same day. The blockage in the sewage line was then cleared and the line was then returned to service.

Pursuant to Order No. 94-50, Reporting Requirement 10, the following representative has prepared and is authorized to sign the reports required by this order: Robert K. Heckler, Environmental Engineer.

9503030115 950217 PDR ADOCK 05000362 S PDR

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Mr. AghulI . Coe January 27,1995 l i

t I certify under penalty oflaw that I have personally examined and am familiar with the information i submitted in the attached document, and based on my inquiry of those individuals immediately i responsible for obtaining the information, I believe the submitted information is tme, accurate and j complete. I am aware that there are significant penalties for submitting false information, j

including the possibility of fine and imprisonment. ,

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t Sincerely,  ;

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. W. TON l Manager, Site Support Services -i enc.  ;

RKH95015.lsp i

cc: Environmental Protection Agency Region IX  ;

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