ML082460930
| ML082460930 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/08/2008 |
| From: | Donohew J Plant Licensing Branch IV |
| To: | Rosenblum R Southern California Edison Co |
| Donohew J N, NRR/DLPM,415-1307 | |
| References | |
| TAC MD4580, TAC MD4581, TAC MD6256, TAC MD6257 | |
| Download: ML082460930 (4) | |
Text
September 8, 2008 Mr. Ross T. Ridenoure 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 -
CORRECTIONS TO SAFETY EVALUATIONS ISSUED FOR APPROVAL TO USE ALTERNATIVES TO REQUIREMENTS FOR REPAIR/REPLACEMENT ACTIVITIES RELATED TO THE PERFORMANCE OF STRUCTURAL WELD OVERLAYS (TAC NOS. MD4580, MD4581, MD6256, AND MD6257)
Dear Mr. Ridenoure:
By letters dated February 21 and August 1, 2007 to the U.S. Nuclear Regulatory Commission (NRC) (Agencywide Documents Access and Management System (ADAMS) Accession Nos.
ML070570433 and ML072150046, respectively), Southern California Edison Company (SCEC, the licensee) submitted two requests to approve the use of alternatives to the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code),Section XI, 1995 Edition through 1996 Addenda, IWA-4000, for repair/replacement activities related to the performance of structural weld overlays at San Onofre Nuclear Generating Station (SONGS), Units 2 and 3, for the third 10-year inservice inspection (ISI) interval. Specifically, these two letters addressed Relief Requests (RRs) ISI-3-27 and ISI-3-28.
The NRC staff authorized these RRs in its two letters dated December 13, 2007 (ADAMS Accession Nos. ML073240437 and ML073250004).
The RRs ISI-3-27 and ISI-3-28 involved weld overlays for the reactor coolant system hot leg nozzles and the pressurizer surge nozzles. In the licensees letter dated August 29, 2008, SCEC states that in preparation for implementation of these weld overlays it discovered that there was an error in the information provided to the NRC staff in its letters dated February 21 and August 1, 2007.
In letters dated February 21 and August 1, 2007, the base material specification for the hot leg surge line nozzle forging and the shutdown cooling line nozzle forging was stated to be SA-105 Grade II for both Units 2 and 3. In letter dated August 29, 2008 (ADAMS Accession No. ML082470024), SCEC states that this is true for Unit 2; however, for Unit 3, the base material specification for these two nozzle forgings is SA-541, Class 1. SCEC states that, based on the similar properties of these two materials, it believed that its conclusions for Unit 3 in the relief requests are unchanged and, thus, the basis for the relief requests for Unit 3 remain valid.
The NRC staff reviewed the correction to the base material for the two nozzles for Unit 3 stated in the SCEC letter dated August 29, 2008. We agree with SCEC's conclusion that the above difference in the specified base material does not change the NRC staff conclusions in our two above letters dated December 13, 2007, and the attached safety evaluations.
Sincerely,
/RA/
Jack N. Donohew, 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
ML082460930 OFFICE NRR/LPL4/PM NRR/LPL4/LA DCI/CPNB/BC NRR/LPL4/BC NRR/LPL4/PM NAME JDonohew GLappert TChan MMarkley JDonohew DATE 9/03/08 09/03/08 09/02/08 9/08/08 9/08/08
San Onofre Nuclear Generating Station (June 2008)
Units 2 and 3 cc:
Douglas K. Porter, Esquire Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770 Dr. David Spath, Chief Division of Drinking Water and Environmental Management California Dept. of Health Services 850 Marina Parkway, Bldg P, 2nd Floor Richmond, CA 94804 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101 Mark L. Parsons Deputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522 Mr. Gary L. Nolff Assistant General Manager - Resources Riverside Public Utilities City of Riverside, California 3901 Orange Street Riverside, CA 92501 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-41254 Mr. Michael L. De Marco San Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548 Resident Inspector San Onofre Nuclear Generating Station c/o U.S. Nuclear Regulatory Commission Post Office Box 4329 San Clemente, CA 92674 Mayor City of San Clemente 100 Avenida Presidio San Clemente, CA 92672 Mr. James T. Reilly Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. James D. Boyd California State Liaison Officer Vice Chair and Commissioner California Energy Commission 1516 Ninth Street, MS 31 Sacramento, CA 95814 Mr. Gary Butner Acting Branch Chief Department of Public Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899-7414 Vice President and Site Manager Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. A. Edward Scherer Director, Nuclear Regulatory Affairs Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128