ML071980250
| ML071980250 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/25/2007 |
| From: | Hiltz T NRC/NRR/ADRO/DORL/LPLIV |
| To: | Mills G - No Known Affiliation |
| Kalyanam N, NRR/DORL/LP4, 415-1480 | |
| References | |
| EA-03-009, TAC MD5573, TAC MD5574 | |
| Download: ML071980250 (5) | |
Text
July 25, 2007 Mr. Glen R. Mills P.O. Box 3393 Mission Viejo, CA 92690
SUBJECT:
RESPONSE TO YOUR LETTER DATED APRIL 30, 2007 - CONCERNS RELATING TO PRESSURIZER NOZZLES AND INTEGRITY OF THE REACTOR COOLANT PRESSURE BOUNDARY
Dear Mr. Mills:
By letter dated April 30, 2007 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML071920309), to the Office of the Inspector General (OIG) of the Nuclear Regulatory Commission (NRC), you described your concerns regarding the integrity of the San Onofre Nuclear Generating Station, Units 2 and 3 (SONGS 2 and 3) reactor pressure vessel (RPV) boundary. The OIG referred this matter to the NRC Office of Nuclear Reactor Regulation (NRR). In your letter, you requested that SONGS 2 and 3 should be shut down immediately and remain shutdown until the nuclear safety concerns are resolved.
In your letter, you also referred to the Exponent Failure Analysis Associates and Altran Solutions Corporation (jointly referred to as Exponent) Report Project Number BN63097.001, Review & Analysis of the Davis-Besse March 2002 Reactor Pressure Vessel Head Wastage Event. Details on NRCs review of the Exponent Report can be found in ADAMS under Accession No. ML071240254.
In addition, the First Revised NRC Order EA-03-009, Interim Inspection Requirements for Reactor Pressure Vessel (RPV) Heads at Pressurized Water Reactors, dated February 20, 2004, provides the current regulatory requirements for RPV head and associated vessel head penetration (VHP) nozzle inspections for all U.S. pressurized-water reactors. In accordance with EA-03-009, Part IV.B, Southern California Edison (the licensee for SONGS 2 and 3) assigned SONGS 2 and 3 to the High primary water stress-corrosion cracking (PWSCC) susceptibility category. All current High and Moderate PWSCC susceptibility category plants have performed volumetric examinations of their VHP nozzles within the past 2 1/2 years.
Where indications of PWSCC were found, all have been repaired, or the RPV head has been replaced.
G. Mills In summary, NRR has reviewed your concerns and has concluded that NRC requirements in conjunction with staff follow-up actions in response to the reported instance of wastage of the RPV head will continue to ensure reactor coolant pressure boundary integrity during normal operation, transients, and accident events.
I hope that the information in this letter adequately responds to your concerns.
Sincerely,
/RA by Michael Markley for/
Thomas G. Hiltz, Chief 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
ML071980250 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/DCI/CPNB NRR/LPL4/BC NAME NKalyanam JBurkhardt TChan THiltz, MMarkley for DATE 7/19/07 7/19/07 7/24/07 7/25/07
May 2007 San Onofre Nuclear Generating Station Units 2 and 3 cc:
Mr. Raymond W. Waldo, Vice President, Nuclear Generation Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. 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 Director - Resources City of Riverside 3900 Main Street, 4th Floor Riverside, CA 92522 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Michael J. DeMarco San Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548 Director, Radiologic Health Branch State Department of Health Services P.O. Box 997414, MS 7610 Sacramento, CA 95899-7414 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, Commissioner California Energy Commission 1516 Ninth Street (MS 31)
Sacramento, CA 95814 Brian Katz 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 95899-7414 Mr. A. Edward Scherer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128