ML13330A446
| ML13330A446 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 10/15/1984 |
| From: | Medford M Southern California Edison Co |
| To: | Paulson W Office of Nuclear Reactor Regulation |
| References | |
| TAC-10853 NUDOCS 8410170256 | |
| Download: ML13330A446 (2) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M.O. MEDFORD TELEPHONE MANAGER, NUCLEAR LICENSING October 15, 1984 (213) 572-1749 Director, Office of Nuclear Reactor Regulation Attention: W. A. Paulson, Acting Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
Subject:
Docket No. 50-206 Proposed Change No. 126 to the Technical Specifications San Onofre Nuclear Generating Station Unit 1 The subject proposed change provided by letter dated November 30, 1983 revised the surveillance testing requirement for the 125-volt D.C. Bus No. 2 battery charger. The existing Technical Specifications require the battery charger to be demonstrated operable by verifying the charger will supply at least 45 amps at 125 volts for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
The proposed specification would revise this surveillance test to require the charger to supply at least 200 amps at 130 volts for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. The voltage increase from 125 to 130 volts is intended to formalize station practice. The increase in current from 45 amps to 200 amps would reflect modifying the charger test to measure the rated capacity of the charger (200 amps) as opposed to measuring the required output of 45 amps (the required output is the output necessary to supply the\\various continuous steady-state loads plus the charging capacity to restore the battery from the design minimum charge state to the fully charged state within eight hours).
Based on our further review of the charger test, it is concluded that subjecting the charger to its rated capacity at each surveillance test provides no significant benefits and may cause unnecessary charger degradation. Since testing the charger at the required output of 45 amps will demonstrate the charger's ability to perform its intended function, this test is sufficient to satisfy operability requirements. Therefore, it is our intention to continue testing the charger at the required output of 45 amps.
Accordingly, please revise Proposed Change No. 126, Section 4.4.D.2.c.5 to maintain the charger output current consistent with the existing Technical Specification as follows:
"4.4.0.2.c.5 The battery charger for 125 volt DC Bus No. 2 will supply at least 45 amps DC at 130 volts for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and" 984162010256 G
PDADOCK 41j P000206 l
Kr. W.
October 15, 1984 A second item relating to Proposed Change No. 126 involves an editorial correction identified during discussions with NRC reviewers.
Footnote (2) of proposed Table 4.4-1 "Battery Surveillance Requirements" inadvertently omitted the operability contingency that battery parameters must be within allowable values. This footnote should be revised as follows:
"(2)
For any Category B parameter(s) outside the limit(s) shown, the battery may be considered OPERABLE provided that the Category B parameter(s) are within their allowable values and provided the Category B parameter(s) are restored to within limits within 7 days."
Accordingly,'please revise Proposed Change No. 126 to reflect the above corrections. If you have any questions or desire additional information, please call me.
Very truly yours, cc: J. 0. Ward, Chief, Radiological Health Branch, State Department of Health Services
- 3. Zwetzig, NRC Region V E. McKenna, NRC Project Manager