ML073090343

Request for Additional Information on the Response to GL 2007-01

ML073090343
Person / Time
Site:	Palo Verde
Issue date:	11/08/2007
From:	Markley M NRC/NRR/ADRO/DORL/LPLIV
To:	Edington R 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 Mr. Matthew Benac Arizona Corporation Commission Assistant Vice President 1200 W. Washington Street Nuclear & Generation Services Phoenix, AZ 85007 El Paso Electric Company 340 East Palm Lane, Suite 310 Mr. Douglas Kent Porter Phoenix, AZ 85004 Senior Counsel Southern California Edison Company Mr. John Taylor Law Department, Generation Resources Public Service Company of New Mexico P.O. Box 800 2401 Aztec NE, MS Z110 Rosemead, CA 91770 Albuquerque, NM 87107-4224 Senior Resident Inspector Mr. Geoffrey M. Cook U.S. Nuclear Regulatory Commission Southern California Edison Company P.O. Box 40 5000 Pacific Coast Hwy Bldg D21 Buckeye, AZ 85326 San Clemente, CA 92672 Regional Administrator, Region IV Mr. Robert Henry U.S. Nuclear Regulatory Commission Salt River Project Harris Tower & Pavillion 6504 East Thomas Road 611 Ryan Plaza Drive, Suite 400 Scottsdale, AZ 85251 Arlington, TX 76011-8064 Mr. Jeffrey T. Weikert Chairman Assistant General Counsel Maricopa County Board of Supervisors El Paso Electric Company 301 W. Jefferson, 10th Floor Mail Location 167 Phoenix, AZ 85003 123 W. Mills El Paso, TX 79901 Mr. Aubrey V. Godwin, Director Arizona Radiation Regulatory Agency Mr. John Schumann 4814 South 40 Street Los Angeles Department of Water & Power Phoenix, AZ 85040 Southern California Public Power Authority P.O. Box 51111, Room 1255-C Mr. Scott Bauer, Director Los Angeles, CA 90051-0100 Regulatory Affairs Palo Verde Nuclear Generating Station Mr. Brian Almon Mail Station 7636 Public Utility Commission P.O. Box 52034 William B. Travis Building Phoenix, AZ 85072-2034 P.O. Box 13326 1701 North Congress Avenue Mr. Dwight C. Mims Austin, TX 78701-3326 Vice President Regulatory Affairs and Plant Improvement Ms. Karen O'Regan Palo Verde Nuclear Generating Station Environmental Program Manager Mail Station 7605 City of Phoenix P.O. Box 52034 Office of Environmental Programs Phoenix, AZ 85072-2034 200 West Washington Street Phoenix AZ 8500