ML20115B166

NPDES Noncompliance Notification:On 960420,release of 22,440 Gallons of Water with Ph of 12.6 from High Flow Makeup Demineralizer (Hfmud) Waste Neutralization Tank Occurred,As Specified in Title 22 of State of CA Code of Regulations

ML20115B166
Person / Time
Site:	San Onofre
Issue date:	05/29/1996
From:	Newton H SOUTHERN CALIFORNIA EDISON CO.
To:	Robertus J CALIFORNIA, STATE OF
Shared Package
ML20115B169	List: ML20115B166 ML20115B177 ML20115B879 ML20115B890 ML20117M801
References
NUDOCS 9607090278
Download: ML20115B166 (3)

Text

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Southem Califomia Edison Company F* O. f50x 12e i SAN CLEMENTE CALWORNIA 92674 i

H W NEWTON trLrpMoNE 4 SACAv40em .

(7,43365-9940 A e .o o.n .name' ' May 29.1996 l r

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Mr. John Robertus : i California Regional Water _ Quality Control Board '

San Diego Region 9771 Clairemont Mesa Boulevard, Suite B >

' San Diego,~ California 92124-1331~ ,

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SUBJECT:

NPDES Discharge Monitoring Report San Onofre Nuclear Generating Station. Unit 2  !

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Dear'Mr. Robertus:

I' The NPDES Discharge Monitoring Report (DMR) for San Onofre Unit 2 covering the month of April is submitted in accordance with the requirements of Order No. 94-49 (NPDES Permit No.

CA0108073). = A summary of the generating unit's status and significant analytical results is provided below.

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. The unit was operational all month. 'All sampled water sources were found to be within permit

. limits with the following exception. On April 20 at 1810, a release of 22,440 gallons of water with a pH of 12.6 from the High Flow Makeup Demineralizer (HFMUD) Waste Neutralization .

Tank occurred. The water released from this tank exceeded the pH limit of 12.5 as specified in t Title 22 of the California Code ofRegulations. The amount of caustic released was however below the reportable quantity level specified by these regulations. Notifications to all of the  ;

required agencies were completed on April 22 at 1530. Although a sample for total' suspended i

_ solids (TSS) was not analyzed for the release, it is believed that the 12.6 pH water resulted in a release above the instantaneous limit of 100 mg/l specified in the NPDES Permit due to  ;

magnesium and calcium hydroxyls that come out of solution at that pH level. An investication of f the incident occurred and has resulted in greater supervisory controls of the operations at the '

' HFMUD, We believe that these actions along with additional training requirements should prevent such an occurrence from happening again in the future. l l

Pursuant to Order No. 94-49, Reporting Requirement 10, the following representative has i prepared and is authorized to sign the reports required by this order: Robert K. Heckler, i Environmental Engineer. i r

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9607090278 960613 ADOCK 05000361

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i Mr. John Robertus

- May 29,1996 i

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- I certify under penalty oflaw that I have personally examined and am familiar with the information l submitted in the attached document, and based on my inquiry of those individuals immediately ,

responsible for obtaining the information, I believe the submitted information is true, accurate,- I and complete. I am aware that there are significant penalties for submitting false information,-

' including ths possibility of fine and imprisonment.

Sincerely, kIb d W H. W. Newton Manager, Site Support Services

. Enclosure cc: Environmental Protection Agency, Region IX 4

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4 bec: W.. C.' Marsh /K. .Yhip . gj~ i H..W. Newton /M. J. Johnsone- -w/o' enclosure . ,

. ' R. V. D Reid/D.' W. Kay

' N. J. Mascolo - w/o enclosure j

G. Gibson - w/o enclosure .

. K. T. Herbinson '

J. Demlow - w/o enclosure .

4 CDM Files 1

2 IDB - Water / R.K. Heckler  !

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