ML080510200

NRC Generic Letter 2007-01: Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients

ML080510200
Person / Time
Site:	San Onofre
Issue date:	02/14/2008
From:	Scherer A E Southern California Edison Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GL-07-001
Download: ML080510200 (2)

Text

SOUTHERN CALIFORNIA A. Edward Scherer EDISON Director Nuclear Regulatory Affairs An EDISON INTERNATIONAL Company February 14, 2008 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

San Onofre Nuclear Generating Station, Units 2 and 3 Docket Nos. 50-361 and 50-362 NRC Generic Letter 2007-01: Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients

References:

1. NRC Generic Letter 2007-01: Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients, dated February 7, 2007 2. SCE to NRC letter: San Onofre Nuclear Generating Station, Units 2 and 3, Docket Nos. 50-361 and 50-362, NRC Generic Letter 2007-01: Inaccessible or Underground Power Cable Failures That Disable Accident Mitigation Systems or Cause Plant Transients, Dated May 7, 2007 3. NRC to SCE letter 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 Sir or Madam:

This is in response to Reference 3 which requested additional information regarding the plant history search described in Reference 2; the SCE response to Reference 1 (Generic Letter 2007-01).The NRC requested confirmation that the electronic SCE database cable failure history search in the San Onofre Units 2 and 3 investigations for Generic Letter 2007-01 included cable failures that occurred prior to July 10, 1996 (or the licensee's implementation date of the Maintenance Rule) and included cable failures that can be searched for in an electronic database, regardless of the actual date of the failure.P.O. Box 128 San Clemente, CA 92674 f,1-l Document Control Desk-2-February 14, 2008 SCE confirms that the electronic database cable failure history search in the San Onofre Units 2 and 3 investigations for Generic Letter 2007-01 included a history search for all past cable failures, regardless of the actual date of the failure.Should you have any questions, or require additional information, please contact Ms. Linda Conklin at (949) 368-9443.Sincerely, cc: E. E. Collins, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 S. Y. Hsu, Department of Health Services, Radiological Health Branch