ML040420634
| ML040420634 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/10/2004 |
| From: | Bo Pham NRC/NRR/DLPM/LPD4 |
| To: | Stephen Dembek NRC/NRR/DLPM/LPD4 |
| pham b m, nrr dlpm lpdiv-2, 301-415-8450 | |
| References | |
| Download: ML040420634 (5) | |
Text
February 10, 2004 MEMORANDUM TO: Stephen Dembek, Chief, Section 2 Project Directorate IV Division of Licensing Project Management FROM:
Bo M. Pham, Project Manager, Section 2
/RA/
Project Directorate IV Division of Licensing Project Management
SUBJECT:
SAN ONOFRE NUCLEAR GENERATING STATION - CONFERENCE CALL
SUMMARY
REGARDING PRESSURIZER INSPECTION On January 16, 2004, the NRC staff held a tele-conference with Southern California Edison (SCE) regarding their upcoming February outage for San Onofre Nuclear Generating Station (SONGS), Unit 2 and the licensees plans for inspecting the pressurizer heater sleeves, instrument nozzle, vent line, and other components on the pressurizer. The following are discussion highlights.
(1)
SCE plans to perform 100 percent bare metal visual (BMV) examination of all 30 heater sleeve penetrations and all 7 instrument line penetrations (4 at top, 1 on side, 2 on bottom of pressurizer). In addition, SCE will look for leakage past the mechanical nozzle seal assembly (MNSA) where they are installed. Leakage has not been observed from pressurizer heater sleeves during previous refueling outages, but Unit 2 has had leaking instrument line penetrations (no cracks have been characterized as circumferential, however). Alloy 52/152/690 repairs have been implemented on all instrument line penetrations.
(2)
If leakage is discovered as the plant is shutting down or during the outage, the licensee plans to do non-destructive examination (NDE) (eddy current) to characterize all cracks from 1" above to 1" below the attachment weld (an inspection volume that they believe adequately covers the zone in which primary water stress corrosion cracking would be expected based on weld residual stresses). The same scope of NDE would be performed if SCE had to remove a pressurizer heater for any other reason (even if not leaking) and had access to the inside surface of the heater sleeve. Leaking sleeves are to be repaired by the half-nozzle repair option. The staff noted that SCE may need a relief request to perform this half-nozzle repair. SCE agreed to look further into this issue and respond back to the staff.
(3)
The staff and SCE agreed that if circumferential cracking below the attachment weld is discovered, NDE inspection scope expansion would be discussed between SCE and the staff.
(4)
If leakage is discovered when the unit is on power ascension, SCE plans to repair the leakage with a MNSA and characterize the source of the leakage during the next refueling outage. The staff informed SCE that we did not agree with that proposed course of action, and would rather see the pressure boundary inspected by NDE
S. Dembek immediately if leakage is found. SCE acknowledged that they understood our position, and agreed to consider the issue further.
(5)
SCE noted that it is looking into the feasibility of BMV examination of piping butt welds, but were not planning to inspect the four at the top of the pressurizer (three safety valves, one spray valve) at this time. The staff noted that, due to the environment in the pressurizer, we were interested in what licensees were doing to manage degradation in all susceptible Inconel materials within that general area. The staff encouraged SCE to consider taking the appropriate steps to perform BMV examinations of the four butt welded connections at the top of the pressurizer. SCE committed to evaluate that course of action and respond back to the staff.
Docket Nos. 50-361 and 50-362 cc: See next page
CONFERENCE CALL ATTENDEES January 16, 2004 SOUTHERN CALIFORNIA EDISON COMPANY Ed Sherer Jack Rainsberry Tom Raidy Eric Schoonover Pete Wilkens Mehrdad Hojati NRC Stephanie Coffin Matthew Mitcehll Bo Pham Charles Paulk, Region IV James Adams, Region IV Clyde Osterholtz, Region IV Mark Sitek, Region IV
S. Dembek immediately if leakage is found. SCE acknowledged that they understood our position, and agreed to consider the issue further.
(5)
SCE noted that it is looking into the feasibility of BMV examination of piping butt welds, but were not planning to inspect the four at the top of the pressurizer (three safety valves, one spray valve) at this time. The staff noted that, due to the environment in the pressurizer, we were interested in what licensees were doing to manage degradation in all susceptible Inconel materials within that general area. The staff encouraged SCE to consider taking the appropriate steps to perform BMV examinations of the four butt welded connections at the top of the pressurizer. SCE committed to evaluate that course of action and respond back to the staff.
Docket Nos. 50-361 and 50-362 cc: See next page DISTRIBUTION:
PUBLIC PDIV-2 r/f RidsNrrDlpmLpdiv (H. Berkow)
RidsNrrPMBPham RidsNrrLAEPeyton MMitchell (NRR/EMCB)
SCoffin COsterholtz MSitek CPaulk JAdams ACCESSION NO: ML040420634 NRR-001 OFFICE PDIV-2/PM PDIV-1/LA PDIV-2/SC NAME BPham:esp EPeyton SDembek DATE 2/9/04 2/9/04 2/10/04 OFFICIAL RECORD COPY DOCUMENT NAME: C:\\ORPCheckout\\FileNET\\ML040420634.wpd
December 2003 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 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128, Mail Stop: D-3-F San Clemente, CA 92674-0128