ML13331A244
| ML13331A244 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/12/1988 |
| From: | Morgan H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8802180135 | |
| Download: ML13331A244 (2) | |
Text
Southern California Edison Company SAN ONOFRE NUCLEAR GENERATING STATION P. 0. BOX 128 SAN CLEMENTE, CALIFORNIA 92672 H.E.MORGAN TELEPHONE STATION MANAGER February 12, 1988 (714) 368-6241 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555
Subject:
Docket No. 50-206 Special Report San Onofre Nuclear Generating Station, Unit 1
Reference:
Letter, Kenneth P. Baskin (SCE) to H. R. Denton (USNRC) dated May 19, 1986, "Amendment Application No. 136" The reference provided Proposed Change No. 159 to Appendix A, Technical Specifications to Provisional Operating License No. DPR-13. This amendment adds new Limiting Conditions for Operation, Action and Surveillance Requirements pertaining to Emergency Lighting Units. As stated in the reference, San Onofre Unit 1 is operated in accordance with the Proposed Change. Pursuant to Section 3.21 of the Proposed Technical Specification, this submittal provides the Special Report for 8-hour Emergency Lighting Unit being inoperable for greater than 60 days.
On November 12, 1987, during performance of the annual surveillance testing,480 Volt room Emergency Lighting Unit failed to illuminate continuously for the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> test. The lights failed 7-1/2 hours into the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> test. Compensatory lighting ( e.g; flashlights) had been provided in accordance with the Action Statement of the Proposed Technical Specification.
The deficiency was due to low voltages on two of the four batteries. The two batteries were replaced, and the Emergency Lighting Unit was tested satisfactorily and returned to service on January 15, 1988.
Additionally, on December 2, 1987, backyard area Emergency Lighting Unit failed the 8-hour annual surveillance testing. The lights failed 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> into the 8-hour test.
Compensatory lighting had been provided in accordance with the Action Statement of the Proposed Technical Specification.
Initial troubleshooting attributed the failure to low voltages on all four batteries.
The batteries were replaced with new batteries; however, the lights failed to continuously illuminate during retesting.
8802180135 880212 PDR ADOCK 05000206 S
Document Control Desk
-2 Troubleshooting attributed the failure during retesting to a failed charging system circuit board.
Failure of the charging system resulted in the batteries being not fully charged during the retest. The circuit board was replaced and the Emergency Lighting Unit was tested satisfactorily. On February 5, 1988, the Emergency Lighting Unit was returned to service.
If you require additional information, please so advise.
Sincerely, cc: J. B. Martin (Regional Administrator, USNRC Region V)
F. R. Huey (USNRC Senior Resident Inspector, Units 1, 2 and 3)
Institute of Nuclear Power Operations (INPO)