ML073110477

Request for Additional Information, GL 2007-01, Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients

ML073110477
Person / Time
Site:	San Onofre
Issue date:	11/15/2007
From:	Kalyanam N NRC/NRR/ADRO/DORL/LPLIV
To:	Rosenblum R Southern California Edison Co
Kalyanam N, NRR/DORL/LPL4, 415-1480
References
GL-07-001, TAC MD4377, TAC MD4378
Download: ML073110477 (4)

Text

November 15, 2007 Mr. Richard M. Rosenblum Senior Vice President and Chief Nuclear Officer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128

SUBJECT:

SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 -

REQUEST FOR ADDITIONAL INFORMATION ON THE NUCLEAR REGULATORY COMMISSION GENERIC LETTER 2007-01: INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS (TAC NOS. MD4377 AND MD4378)

Dear Mr. Rosenblum:

The U.S. Nuclear Regulatory Commission (NRC) staff has received the cable failure history for San Onofre Nuclear Generating Station, Units 2 and 3, in response to Generic Letter (GL) 2007-01, "Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients." During its review, the licensee found no failures of inaccessible or underground power cables within the scope of Title 10 of the Code of Federal Regulations (10 CFR), Section 50.65, "Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants" (Maintenance Rule (MR)). Please confirm that this history includes cable failures that occurred prior to July 10, 1996.

Paragraph (c) of 10 CFR 50.65 states, "[t]he requirements of this section shall be implemented by each licensee no later than July 10, 1996." The NRC staff is concerned that licensees may have excluded cable failures from the GL 2007-01 responses if the cable failures occurred prior to July 10, 1996 (or the licensee's implementation date of the MR). The NRC staff provided additional guidance on how licensees should determine which cable failures are within the scope of GL 2007-01 in the NRC letter dated April 13, 2007, from Michael J. Case (NRC) to James H. Riley (Nuclear Energy Institute) (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070940311). This document stated to include cable failures that can be searched for in an electronic database, regardless of the actual date of the failure. If San Onofre's response to GL 2007-01 excluded cable failures that occurred prior to July 10, 1996, provide the data for these failures as requested in GL 2007-01.

R. M. Rosenblum Please provide the additional information requested within 30 days of the receipt of this letter.

If you have any questions, please contact me at (301) 415-1480.

Sincerely,

/RA/

N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page

ML073110477 NRR-088 *No change from staff provided RAI OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/DE/EEEB* NRR/LPL4/BC NAME NKalyanam:sp JBurkhardt GWilson THiltz DATE 11/13/07 11/9/07 11/15/07 San Onofre Nuclear Generating Station Units 2 and 3 cc:

Mr. Raymond W. Waldo, Vice President, Director, Radiologic Health Branch Nuclear Generation State Department of Health Services Southern California Edison Company P.O. Box 997414, MS 7610 San Onofre Nuclear Generating Station Sacramento, CA 95899-7414 P.O. Box 128 San Clemente, CA 92674-0128 Resident Inspector San Onofre Nuclear Generating Station Mr. Douglas K. Porter, Esquire c/o U.S. Nuclear Regulatory Commission Southern California Edison Company Post Office Box 4329 2244 Walnut Grove Avenue San Clemente, CA 92674 Rosemead, CA 91770 Mayor Dr. David Spath, Chief City of San Clemente Division of Drinking Water and 100 Avenida Presidio Environmental Management San Clemente, CA 92672 California Dept. of Health Services 850 Marina Parkway, Bldg P, 2nd Floor Mr. James T. Reilly Richmond, CA 94804 Southern California Edison Company San Onofre Nuclear Generating Station Chairman, Board of Supervisors P.O. Box 128 County of San Diego San Clemente, CA 92674-0128 1600 Pacific Highway, Room 335 San Diego, CA 92101 Mr. James D. Boyd, Commissioner California Energy Commission Mark L. Parsons 1516 Ninth Street (MS 31)

Deputy City Attorney Sacramento, CA 95814 City of Riverside 3900 Main Street Brian Katz Riverside, CA 92522 Southern California Edison Company San Onofre Nuclear Generating Station Mr. Gary L. Nolff P.O. Box 128 Assistant Director - Resources San Clemente, CA 92764-0128 City of Riverside 3900 Main Street, 4th Floor Mr. Steve Hsu Riverside, CA 92522 Department of Health Services Radiologic Health Branch Regional Administrator, Region IV MS 7610, P.O. Box 997414 U.S. Nuclear Regulatory Commission Sacramento, CA 95899-7414 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. A. Edward Scherer Southern California Edison Company Mr. Michael L. DeMarco San Onofre Nuclear Generating Station San Diego Gas & Electric Company P.O. Box 128 8315 Century Park Ct. CP21G San Clemente, CA 92674-0128 San Diego, CA 92123-1548 October 2007