ML073090343

Request for Additional Information on the Response to GL 2007-01 (TAC Nos. MD4358, MD4359, and MD4360)

ML073090343
Person / Time
Site:	Palo Verde
Issue date:	11/08/2007
From:	Markley M T NRC/NRR/ADRO/DORL/LPLIV
To:	Edington R K Arizona Public Service Co
Markley, M T, NRR/DORL/LP4, 301-415-5723
References
GL-07-001, TAC MD4358, TAC MD4359, TAC MD4360
Download: ML073090343 (4)

Text

November 8, 2007

Mr. Randall K. Edington Executive Vice President, Nuclear/

Chief Nuclear Officer Mail Station 7602 Arizona Public Service Company P.O. Box 52034 Phoenix, AZ 85072-2034

SUBJECT:

PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 - REQUEST FOR ADDITIONAL INFORMATION ON THE RESPONSE TO GENERIC LETTER 2007-01 (TAC NOS. MD4358, MD4359, AND MD4360)

Dear Mr. Edington:

On February 7, 2007, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 2007-01, "Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients." In GL 2007-01, the NRC requested information from the licensees of operating nuclear power plants on the history of failures at their plants of inaccessible power cables within the scope of Section 50.65, "Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants," in Title 10 of the Code of Federal Regulations (i.e., 10 CFR 50.65, the Maintenance Rule). This information was provided to NRC through the auspices of the Nuclear Energy Institute.

The NRC staff has reviewed the cable failure history data in the letter dated May 3, 2007, which was submitted by Arizona Public Service Company (APS) for the Palo Verde Nuclear Generating Station (Palo Verde) in response to GL 2007-01 and has determined that additional information is needed to clarify the information that was provided. During its review, APS found degraded cable splices on power cables in manholes that failed dielectric strength testing. The licensee reworked these cables in accordance with the Palo Verde Corrective Action Program. If the reworked cables (i.e., cables associated with the degraded splices) were within the scope of the GL, provide the data requested for each repaired cable as requested in GL 2007-01.

The NRC provided additional guidance to licensees on how they should determine the cable failure history 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).

R. K. Edington

We request your response within 60 days of the receipt of this letter. If you have any questions concerning this letter, you are requested to contact me at 301-415-5723.

Sincerely,

/RA/

Michael T. Markley, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

Docket Nos.: 50-528, 50-529, and 50-530

License Nos.: NPF-41, NPF-51, and NPF-74 cc: See next page

ML073090343 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NAME MMarkley JBurkhardt THiltz DATE 11/8/07 11/8/07 11/8/07 Palo Verde Nuclear Generating Station

cc:

Mr. Steve Olea Arizona Corporation Commission 1200 W. Washington Street Phoenix, AZ 85007

Mr. Douglas Kent Porter Senior Counsel Southern California Edison Company Law Department, Generation Resources P.O. Box 800 Rosemead, CA 91770

Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 40 Buckeye, AZ 85326

Regional Administrator, Region IV U.S. Nuclear Regulatory Commission Harris Tower & Pavillion 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064

Chairman Maricopa County Board of Supervisors 301 W. Jefferson, 10th Floor Phoenix, AZ 85003

Mr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency 4814 South 40 Street Phoenix, AZ 85040

Mr. Scott Bauer, Director Regulatory Affairs Palo Verde Nuclear Generating Station Mail Station 7636 P.O. Box 52034 Phoenix, AZ 85072-2034

Mr. Dwight C. Mims Vice President Regulatory Affairs and Plant Improvement Palo Verde Nuclear Generating Station Mail Station 7605 P.O. Box 52034 Phoenix, AZ 85072-2034 Mr. Matthew Benac Assistant Vice President Nuclear & Generation Services El Paso Electric Company 340 East Palm Lane, Suite 310 Phoenix, AZ 85004

Mr. John Taylor Public Service Company of New Mexico 2401 Aztec NE, MS Z110 Albuquerque, NM 87107-4224

Mr. Geoffrey M. Cook Southern California Edison Company 5000 Pacific Coast Hwy Bldg D21 San Clemente, CA 92672

Mr. Robert Henry Salt River Project 6504 East Thomas Road Scottsdale, AZ 85251

Mr. Jeffrey T. Weikert Assistant General Counsel El Paso Electric Company Mail Location 167 123 W. Mills El Paso, TX 79901

Mr. John Schumann Los Angeles Department of Water & Power Southern California Public Power Authority P.O. Box 51111, Room 1255-C Los Angeles, CA 90051-0100

Mr. Brian Almon Public Utility Commission William B. Travis Building P.O. Box 13326 1701 North Congress Avenue Austin, TX 78701-3326

Ms. Karen O'Regan Environmental Program Manager City of Phoenix Office of Environmental Programs 200 West Washington Street Phoenix AZ 8500