ML13322B063

Advises That long-term Electrical Cable Monitoring Program Re 851121 Loss of Offsite Power & Water Hammer Event Reviewed.Program & Procedures Provide Adequate Assurance That Potential Cable Problems Could Be Identified in Future

ML13322B063
Person / Time
Site:	San Onofre
Issue date:	12/08/1989
From:	Trammell C Office of Nuclear Reactor Regulation
To:	Ray H Southern California Edison Co
References
TAC-73782 NUDOCS 8912130449
Download: ML13322B063 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 December 8, 1989 Docket No. 50-206 Mr. Harold B. Ray Vice President Southern California Edison Company Irvine Operations Center 23 Parker Irvine, California 92718

SUBJECT:

LONG TERM ELECTRICAL CABLE MONITORING PROGRAM SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 1 (TAC 73782)

References:

A. "Investigation Report of November 21, 1985 Water Hammer Event," transmitted by letter dated April 8, 1986, from M. 0. Medford (SCE) to A. E. Chaffee (NRC)

B. "Investigation of the November 1985 In-Service Cable Failure and Report on the Material Condition of Cables," transmitted by letter dated June 3, 1986, from M. 0. Medford (SCE) to G. E. Lear (NRC)

C. "Technical Evaluation of Issues from the NRC Staff Action Plan in Response to the November 21, 1985 Event at San Onotre Unit 1," transmitted by letter dated November 12, 1986, from T. M. Novak (NRC) to K. P. Baskin (SCE)

D. Letter from F. R. Nandy, Manager of Nuclear Licensing, Southern California Edison to Document Control Desk dated July 12, 1989 As a result of the November 21, 1985, loss of offsite power and water hammer event at San Onofre Unit 1, it was recognized (References A, B and C) that long term cable monitoring was required. Reference C requested that SCE submit a description of the proposed cable monitoring program for NRC review, and Reference D provided your response. We have completed our review of this matter, and find that your program and procedures provide adequate assurance that potential cable problems such as water intrusion, poor insulation, ground

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89121-30C449 _891208 FDR ADOCK OBOPDC F

0 Harold B. Ray

- 2 paths and poor electrical connections are likely to be identified in the future. We consider this matter closed. The issuance of this letter, together with our letter of April 29, 1987, resolves all outstanding issues identified on page 42 of our safety evaluation of November 12, 1986, "Technical Evaluation of Issues from the NRC Staff Action Plan in response to the November 21, 1985 Event at San Onofre, Unit 1."

Please contact us if you should have any question.

Sincerely, Charles M. Trammell, Senior Project Manager Project Directorate V_

Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

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Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc David R. Pigott Mr. F. B. Marsh, Project Manager Orrick, Herrington & Sutcliffe Bechtel Power Corporation 600 Montgomery Street P. 0. Box 60860 San Francisco, California 94111 Terminal Annex Los Angeles, California 90060 Mr. Robert G. Lacy Manager, Nuclear San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector/San Onofre NPS U.S. NRC P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman Board of Supervisors County of San Diego 1600 Pacific Highway Room 335 Sari Diego, California 92101 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Management Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don Womeldorf Chief Environmental Management California Department of Health 714 P Street, Room 616 Sacramento, California 95814

Harold December 8, 1989 paths and poor electrical connections are likely to be identified in the future. We consider this matter closed. The issuance of this letter, together with our letter of April 29, 1987, resolves all outstanding issues identified on page 42 of our safety evaluation of November 12, 1986, "Technical Evaluation of Issues from the NRC Staff Action Plan in response to the November 21, 1985 Event at San Onofre, Unit 1."

Please contact us if you should have any question.

Sincerely, original signed by Charles M. Trammell Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects -

III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

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