ML20059L140
| 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: |
| 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 letter transmits cop)ies of the referenced National Pollutant Discharge' Elimination System (NPDES monitoring reports for. San Onofre 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
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Document Control Desk 'l If you have any. questions, please contact me.
.1 Sincerely, (h
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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 l
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