ML20126K918
| ML20126K918 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/04/1993 |
| From: | Fields M Office of Nuclear Reactor Regulation |
| To: | Guiles E, Ray H SAN DIEGO GAS & ELECTRIC CO., SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| TAC-M85091, NUDOCS 9301070295 | |
| Download: ML20126K918 (4) | |
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UNITED STATES n
i NUCLEAR REGULATORY COMMISSION 3
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WASHINoTON, D.C. 206fi,
\\*...+f January 4, 1993 Docket Nos. 50-361 and 50-362 Mr. Harold B. Ray Mr. Edwin A. Guiles Senior Vice President Vice President Southern California Edison Co.
Engineering and Operations Irvine Operations Center San Diego Gas & Electric Co.
23 Parker Street 101 Ash Street Irvine, California 92718 San Diego, California 92112 Gentlemen:
SUBJECT:
REPLACEMENT OF EXIDE BATTERIES AT SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 (TAC NOS. M85091 AND M85092)
San Onofre Nuclear Generating Station, Units 2 and 3 has experienced problems with Exide batteries.
Specifically, some jars of three of the Class IE 125 VDC safety-related station battery banks for Units 2 and 3 have cracked covers.
Southern California Edison (SCE) has disconnected the affected cells of the jars with cracking covers and the batteries remain operable.
To eliminate the problem with cracking jar covers, SCE has decided to expeditiously replace these three battery banks with a new Exide battery design that is not subject to this cracking phenomenon (the other five safety-related station batteries for Units 2 and 3 are of the new Exide battery design).
In a letter to the staff dated November 20, 1992, SCE provided the details of the planned replacement of the one Unit 2 safety-related battery bank and the two Unit 3 safety-related battery banks containing cracked jar covers during normal power operation.
This replacement process will involve the installation of a temporary battery bank near the battery rooms (in the east end of fire area 2-AC-50-29) that will serve as a replacement safety-related battery during the period when each of the battery banks with cracked jar covers are being replaced.
The only issue requiring prior staff approval before the battery replacement can be accomplished is the need to temporarily depart from a previously approved deviation from 10 CFR 50, Appendix R, Section Ill.G.2, for fire area 2-AC-50-29.
The staff had previously approd the requested deviation for this area, Deviation Request No. 8, by SER dated June 29, 1988.
i The revised Deviation Request No. 8, attached to the SCE November 20, 1992 letter, delineates the actions that will be taken to compensate for the reduced margins in cable separation that will occur during the periods when the temporary battery acts as a safety-related battery for one or the other unit.
The staff finds that the planned compensatory measures, in particular the use of continuous and one-hour am a,
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rMessrs,iRay,and Guilos January'4, 19933
- fire' watches _during specific' plant modifications', p; ovide an adequate l
level of_ fire protection during the period when the batteries'with cracked covers are' replaced. The. staff concludes, therefore,:that-the conditions-and compensatory actions described in the revised Deviation Request No. 8 are acceptable deviations _frem C.S.b.(2) of Branch.
Technical Position-CMEB 9.5.1.
Orice the batteries with cracked jars-have been replaced, the licensee has committed to restore the plant configuration to the configuration described in the original Deviation Request No. 8.
Sincerely, Original signed by Mel B. Fields, Project Manager Project Directorate V Division of Reactor Projects Ill/IV/V Office of Nuclear Reactor Regulation cc:
See next page DISTRIBUTIOJ:
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fire watches during specific plant modifications, provide an adequate level of fire protection during the period when the batteries with cracked covers are replaced.
The staff concludes, therefore, that the conditions and compensatory actions described in the revised Deviation Request No. 8 are acceptable deviations from C.5.b.(2) of Branch Technical Position CHEB 9.5.1.
Once the batteries with cracked jars have been replaced, the licensee has committed to restore the plant configuration to the configuration described in the original Deviation Request No. 8.
Sincerely, fff f h:
Hel B. Fields, Project Manager Project Directorate V Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation cc:
See next page l
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h Messrs. Ray and Guiles San Onofre Nuclear Generating Southern California Edison Company Station, Unit Nos. 2 and 3 e
cc:
James A. Beoletto, Esq.
Mr. Richard J. Kosiba, Project Manager Southern California Edison Csmpany Bechtel Power Corporation Irvine Operations Center 12440 E. Imperial Highway 23 Parker Street Norwalk, California 90650 Irvine, California 92718 Mr. Robert G. Lacy Chairman, Board of Supervisors Manager, Nuclear Department County of San Diego San Diego Gas & Electric Company 1600 Pacific Highway, Room 335 P. O. Box 1831 San Diego, California 92101 San Diego, California 92112 Alan R. Watts, Esq.
Hr. Hank Kocol Rourke & Woodruff Radiologic Health Branch 701 S. Farker St. No. 7000 State Department of Health Services Orange, California 92668-4702 Post Office Box 942732 Sacremento, California 94234 Mr. Sherwin Harris Resource Project Manager Public Utilities Department City of Riverside Resident Inspector / San Onofre NPS 3900 Main Street c/o U.S. Nuclear Regulatory Commission Riverside, California 92522 Post Office Box 4329 San Clemente, California 92674 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations ABB Combustion Engineering Nuclear Power Mayor 12300 Twinbrook Parkway, Suite 330 City of San Clemente Rockville, Maryland 20852 100 Avenida Presidio San Clemente, California 92672 Hr. Howard J. Wong Regional Administrator, Region V U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Region V l-;0 Maria Lane, Suite 210 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Walnut Creek, California 94596 Mr. Don J. Womeldorf Chief, Environmental Management Branch California Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 4