ML071300007

Request for Additional Information on the Response to Generic Letter 2006-03, Potentially Nonconforming Hemyc and MT Fire Barrier Configurations

ML071300007
Person / Time
Site:	San Onofre
Issue date:	05/23/2007
From:	Kalyanam N NRC/NRR/ADRO/DORL/LPLIV
To:	Rosenblum R Southern California Edison Co
Kalyanam N, NRR/DLPM, 415-1480
References
GL-06-003, TAC MD1629, TAC MD1630
Download: ML071300007 (5)

Text

May 23, 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 RESPONSE TO GENERIC LETTER 2006-03, POTENTIALLY NONCONFORMING HEMYC AND MT FIRE BARRIER CONFIGURATIONS (TAC NOS. MD1629 AND MD1630)

Dear Mr. Rosenblum:

The U. S. Nuclear Regulatory Commission (NRC) Generic Letter (GL) 2006-03, issued on April 10, 2006, requested licensees to provide the following information: 1.a) a statement on whether Hemyc or MT fire barrier material is used at their nuclear power plants, and 1.b) a description of the controls that were used to ensure that other fire barrier types used are capable of providing the necessary level of protection.

By letter dated June 2, 2006 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML061590310), Southern California Edison provided the 60-day response as required by the GL. The letter noted that Cerablanket Electrical Raceway Fire Barrier System (ERFBS), as approved in the June 29, 1988, Safety Evaluation Report (SER),

were replaced by 3M ERFBS that were "demonstrated" to provide better protection; however, there was no supporting documentation included or referenced in your GL response.

In this regard, the NRC staff has determined that additional information outlined below is needed to complete the review. We discussed this information with your staff by telephone on May 8, 2007, and they agreed to provide the additional information requested within 30 days of the receipt of this letter.

1) Provide the technical justification that was used to demonstrate that the 3M configurations provide a fire resistance capability greater than the Cerablanket raceways in all installed configurations, including a comparison between the 3M and Cerablanket materials, fire resistance properties, installation configuration, etc.

2) Confirm that the installed 3M fire barriers that were not bounded by fire testing criteria are installed in accordance with the manufacturers recommendations, specifically: mat materials used, minimum thickness of material, banding materials and spacing, use of collars, and fill, void, cavity materials used (caulk).

R. M. Rosenblum 3) Confirm that the plant conditions, namely, cable loading, automatic fire detection and suppression, and manual suppression capability are currently the same as they were when the Cerablanket was approved.

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

Enclosure:

Request for Additional Information cc: See next page

ML071300007 *No major change from Staff provided RAI.

OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/DRA/AFPB* NRR/LPL4/BC NAME NKalyanam JBurkhardt SWeerakkody THiltz DATE 5/23/07 5/23/07 5/2/07 5/23/07 San Onofre Nuclear Generating Station Units 2 and 3 cc:

Mr. Daniel P. Breig Director, Radiologic Health Branch Southern California Edison Company State Department of Health Services San Onofre Nuclear Generating Station P.O. Box 997414, MS 7610 P. O. Box 128 Sacramento, CA 95899-7414 San Clemente, CA 92674-0128 Resident Inspector/San Onofre NPS 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 Mr. David Spath, Chief City of San Clemente Division of Drinking Water and 100 Avenida Presidio Environmental Management San Clemente, CA 92672 P. O. Box 942732 Sacramento, CA 94234-7320 Mr. James T. Reilly Southern California Edison Company Chairman, Board of Supervisors San Onofre Nuclear Generating Station County of San Diego P.O. Box 128 1600 Pacific Highway, Room 335 San Clemente, CA 92674-0128 San Diego, CA 92101 Mr. James D. Boyd, Commissioner Mark L. Parsons California Energy Commission Deputy City Attorney 1516 Ninth Street (MS 31)

City of Riverside Sacramento, CA 95814 3900 Main Street Riverside, CA 92522 Mr. Ray Waldo, Vice President Southern California Edison Company Mr. Gary L. Nolff San Onofre Nuclear Generating Station Assistant Director - Resources P.O. Box 128 City of Riverside San Clemente, CA 92764-0128 3900 Main Street Riverside, CA 92522 Mr. Brian Katz Southern California Edison Company Regional Administrator, Region IV San Onofre Nuclear Generating Station U.S. Nuclear Regulatory Commission P.O. Box 128 611 Ryan Plaza Drive, Suite 400 San Clemente, CA 92764-0128 Arlington, TX 76011-8064 Mr. Michael R. Olson San Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548 March 2006

San Onofre Nuclear Generating Station Units 2 and 3 cc:

Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899 Mr. A. Edward Scherer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 March 2006