ML20059L140

Forwards NPDES Monitoring Repts for Songs,Units 2 & 3, Reporting Use of diethyl-p-phenylenediamine Colorimetric Rather Amperometric Titration Method to Determine Total Residual Chlorine for Month of Nov 1993

ML20059L140
Person / Time
Site:	San Onofre
Issue date:	01/25/1994
From:	Marsh W SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20059L141	List: ML20059L140 ML20059L146 ML20059L150
References
NUDOCS 9402030207
Download: ML20059L140 (2)

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U. S. Nuclear Regulatory Commission i Document Control Desk -i Washington, D.C. 20555

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Subject:

Docket Nos. 50-361 and 50-362 Report of NPDES Permit Violations San Onofre Nuclear Generating Station, Units 2 and 3

References:

Letters (2) from H. W. Newton (Edison) to A. L. Coe (California Regional Water Quality Control Board, San Diego Region) dated December 30, 1993 ,

y This Elimination letter transmits System (NPDES cop)iesmonitoring of the referenced reports for.National Pollutant San Onofre Discharge' Nuclear. '!

Generating Station Units 2 and 3 for the month of November 1993 (enclosed).. ..

This information'is being provided in accordance with section 3.2 of Appendix. l B to Facility License Nos. NPF-10 and NPF-15 for Units 2 and 3, which requires ...

. Southern California Edison to report violations.of the NPDES permit to the_

NRC.  ;

As discussed in the referenced letters, an NPDES permit discrepancy was .

l identified in the analytical method used.to determine total residual chlorine for both units. The November sample. results were obtained by. the diethyl-p- .

phenylenediamine (DPD) colorimetric method rather than the amperometric ~ -

titration method required by 40 CFR 432.11 and the NPDES permits.

Edison uses the Environmental Protection Agency-approved DPD colorimetric method to take weekly samples for determining chlorination rates for. condenser -

fouling control. Samples for the monthly NPDES Discharge Monitoring Reports are. analyzed by the amperometric method, but for the month of November 1993, no amperometric analyses were performed.

Weekly sample results using the DPD colorimetric method confirm that NPDES-permit limits on total residual chlorine were not exceeded. During the ,.

reporting period, Unit 3 was shut down in a refueling outage and no chlorination of the circulating water took place. .l To prevent recurrence Edison is enhancing the ' san,pling and analysis procedure  ;

and checklist. Additionally, Edison will review this incident with Chemistry.

Division Supervision. ,

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.. I 9402030207 940125 I .

PDR ADDCK 05000361 b - '

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Document Control Desk 'l If you have any. questions, please contact me. l

.1 Sincerely,

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Enclosures (2) i cc: K. E. Perkins, Jr., Acting Regional Administrator, U5NRC Region V J. A. -Sloan, NRC Ser:ior Resident Inspector, San Onofre Units 2 and 3 -

M. B. Fields, NRC Project Manager, San-Onofre Units 2 and 3  !

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