ML040840576
| ML040840576 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/19/2004 |
| From: | Stephen Dembek NRC/NRR/DLPM/LPD4 |
| To: | Ray H Southern California Edison Co |
| Pham B, NRR/DLPM, 415-8450 | |
| References | |
| TAC MC0334, TAC MC0335 | |
| Download: ML040840576 (4) | |
Text
March 19, 2004 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128
SUBJECT:
SAN ONOFRE NUCLEAR GENERATING STATION (SONGS), UNITS 2 AND 3 RE: REQUEST FOR RELIEF FROM THE REQUIREMENTS OF THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) BOILER AND PRESSURE VESSEL CODE (CODE) CONCERNING MECHANICAL NOZZLE SEAL ASSEMBLIES (MNSA) (TAC NOS. MC0334 AND MC0335)
Dear Mr. Ray:
By letter dated January 24, 2003, as supplemented by letters dated July 2, 2003, and January 22, 2004, Southern California Edison Company (SCE or the licensee) requested relief (ISI-3-6) from the requirements of ASME Code,Section XI for Class 1 components to continue the use of MNSA as an alternative repair method for reactor coolant system instrumentation nozzles at SONGS, Units 2 and 3.
In accordance with relief request ISI-3-6, the licensee requested an extension of relief for the MNSAs already installed and previously approved by the NRC on a cycle-by-cycle basis (MNSA-1s). By letter dated March 27, 2002, the NRC staff approved the temporary installation of the MNSA-1s only through Cycle 12, which was already an extension of one cycle beyond the initially approved two operating cycles approved by letter on July 11, 2000. The staff considers requests for installation beyond two operating cycles as permanent installation, requiring a detailed review of the design and analysis of the MNSAs and the pressure boundary of the components to which they are attached. By letter dated December 5, 2003, the NRC provided guidance regarding information needed to justify the use of MNSAs as permanent repairs. The letter also indicated that a review period of one year would be required by the NRC prior to granting authorization for permanent installation. Because SONGS Unit 2 Cycle 13 operation begins in March 2004, and SONGS Unit 3 Cycle 13 begins in the Fall 2004, SCE stated that it has not had sufficient time to provide the requested information for the required NRC review, and has therefore requested that current authorization for temporary installation of MNSA-1s be extended for both units. By letter dated January 22, 2004, SCE requested ISI-3-6 be approved for one cycle of operation during Cycle 13 for SONGS, Units 2 and 3, and plans to submit justification for MNSA-1s as a permanent repair not later than one year prior to the end of Cycle 13 for Unit 2.
Based on the latest NRC safety evaluation dated March 27, 2002, the staff concludes that the MNSA-1s currently installed in SONGS, Units 2 and 3 will provide an acceptable level of quality and safety for one additional operating cycle. The extension of relief for one additional cycle is therefore authorized, pursuant to 10 CFR 50.55a(a)(3)(i), provided the results of inspections performed during the upcoming Cycle 13 refueling outages at the two units in accordance with
H. Ray the visual inspection plan as delineated in ISI-3-6 demonstrate no leakage through the installed MNSAs.
Sincerely,
/RA/
Stephen Dembek, Chief, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc w/encl: See next page
H. Ray the visual inspection plan as delineated in ISI-3-6 demonstrate no leakage through the installed MNSAs.
Sincerely,
/RA/
Docket Nos. 50-361 and 50-362 Stephen Dembek, Chief, Section 2 Project Directorate IV cc w/encl: See next page Division of Licensing Project Management Office of Nuclear Reactor Regulation DISTRIBUTION:
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San Onofre Nuclear Generating Station, Units 2 and 3 cc:
Mr. Raymond Waldo, Plant Manager Nuclear Generation Southern California Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, CA 92674-0128 Mr. Douglas K. Porter Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770 Mr. David Spath, Chief Division of Drinking Water and Environmental Management P. O. Box 942732 Sacramento, CA 94234-7320 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101 Eileen M. Teichert, Esq.
Supervising Deputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522 Mr. Gary L. Nolff Power Projects/Contracts Manager Riverside Public Utilities 2911 Adams Street Riverside, CA 92504 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Michael Olson San Diego Gas & Electric Company P.O. Box 1831 San Diego, CA 92112-4150 Mr. Ed Bailey, Radiation Program Director Radiologic Health Branch State Department of Health Services Post Office Box 942732 (MS 178)
Sacramento, CA 94327-7320 Resident Inspector/San Onofre NPS 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. Dwight E. Nunn, Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. James D. Boyd, Commissioner California Energy Commission 1516 Ninth Street (MS 31)
Sacramento, CA 95814 Mr. Joseph J. Wambold, Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899