ML13317B214
| ML13317B214 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/05/1990 |
| From: | Tatum J Office of Nuclear Reactor Regulation |
| To: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| Shared Package | |
| ML13317B215 | List: |
| References | |
| GL-88-11, TAC-71545, NUDOCS 9011080282 | |
| Download: ML13317B214 (2) | |
Text
Docce-t No.. 50-206 0
November 5, 1990 Mr. Harold B. Ray Senior Vice President Southern California Edison Company Irvine Operations Center 23 Parker Street Irvine, California 92718
Dear Mr. Ray:
SUBJECT:
REACTOR VESSEL EMBRITTLEMENT (GL 88-11) - SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 (TAC NO. 71545)
We have completed our review of your response dated December 16, 1988, and January 3 and June 18, 1990, to Generic Letter 88-11, "NRC Position on Radiation Embrittlement of Reactor Vessel Materials and Its Impact on Plant Operations," dated July 12, 1988. Based on our review, we have determined that the existing pressure-temperature limits specified by the Technical Specifications for San Onofre Nuclear Generating Station, Unit No. 1 (SONGS-1) remain valid. Additionally, it is our position that the fracture toughness of the SONGS-1 reactor vessel is acceptable for operation as previously stated in NUREG-0569, "Evaluation of the Integrity of SEP Reactor Vessels, " dated December 1979. Our Safety Evaluation (SE) is enclosed for your information.
Although we consider that the fracture toughness of the SONGS-1 reactor vessel is currently acceptable based on a previous evaluation, we believe that there is insufficient data to fully support your position regarding saturation effects on Charpy upper-shelf energy. Therefore, you should continue to evaluate your position as more surveillance data becomes available. As we discuss in our SE, the staff is considering making a revision to the procedures for calculating Charpy upper-shelf energy and any licensee action required as a result of these changes will be the subject of future generic communications. We expect to evaluate the fracture toughness of the SONGS-1 reactor vessel in more detail at that time.
Please contact us if you should have any questions regarding this matter.
Sincerely, Orb0 inal Sioned By James E. Tatum, Project Manager Project Directorate V 010 8
Division of Reactor Projects -
- III, 901 AD2K 90500206 IV, V and Special Projects P
PNU Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/enclosure:
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0 Mr. Harold B. Ray San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc:
David R. Pigott, Esq.
Mr. Richard J. Kosiba, Project Manager Orrick, Herrington & Sutcliffe Bechtel Power Corporation 600 Montgomery Street 12440 E. Imperial Highway San Francisco, California 94111 Norwalk, California 90650 Mr. Robert G. Lacy Mr. Phil Johnson Manager, Nuclear Department U.S. Nuclear Regulatory Commission Sari Diego Gas & Electric Company Region V P. 0. Box 1831 1450 Maria Lane, Suite 210 San Diego, California 92112 Walnut Creek, California 94596 Resident Inspector, San Onofre NPS c/o U.S. Nuclear Regulatory Commission P. 0. Box 4329 San Clemente, California 92672 Mayor City of San Clemente San Clemente, California 92672 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, California 92101 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. John Hickman Senior Health Physicist Environmental Radioactive Mgmt. Unit Environmental Management Branch State Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 Mr. Don J. Womeldorf Chief, Environmental Management Branch California Department of Health Services 714 P Street, Room 616 Sacramento, California 95814 c