ML13330B152
| ML13330B152 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/02/1987 |
| From: | Dudley R Office of Nuclear Reactor Regulation |
| To: | Baskin K Southern California Edison Co |
| Shared Package | |
| ML13330B153 | List: |
| References | |
| TAC-59980 NUDOCS 8702130425 | |
| Download: ML13330B152 (3) | |
Text
FEB 0 2 1981 Docket No.:
50-206 Mr. Kenneth P. Baskin, Vice President Nuclear Engineering Safety and Licensing Department Southern California Edison Company 2244 Walnut Grove Avenue P.O. Box 800 Rosemead, California 91770
Dear Mr. Baskin:
SUBJECT:
PROJECTED VALUES OF MATERIAL PROPERTIES FOR FRACTURE TOUGHNESS REQUIREMENTS FOR PROTECTION AGAINST PRESSURIZED THERMAL SHOCK EVENTS - IN ACCORDANCE WITH 10 CFR 50.61 Re:
San Onofre Nuclear Generating Station, Unit 1 (SONGS-1)
We have reviewed your letter dated January 23, 1986 which was submitted in response to the Pressurized Thermal Shock (PTS) Rule, 10 CFR 50.61 for SONGS-i.
The SONGS-1 Provisional Operating License (POL) was issued on March 27, 1967. Efforts are currently underway to convert this license to a Full-Term Operating License which would expire 40 years from the issuance date of the Construction Permit (March 2, 1964). Your PTS submittal used March 27, 2007 (40 years from the issuance of the POL) as the end of life for the plant; a conservative assumption for the purposes of the PTS analyses.
Our review of your submittal has concluded that the material properties of reactor vessel beltline materials, the projected fluence at the inner surface of the reactor vessel for the end of life of the plant and the calculated RTOT for the end of life of the plant are acceptable. The calculated RTPTS fo ihe year 2007 is below the screening criterion of 270'F for plate material and therefore meets the requirements of the PTS Rule.
The PTS Rule requires that the projected assessment of the RT must be updated whenever changes in core loadings, surveillance measuprments or other information indicate a significant change in the projected values. This requirement ensures that licensees will track the fluence at the limiting beltline materials throughout the life of the plant to verify their assumptions. In this regard we recommend that you submit a re-evaluation of the RTPTS submittals which are required by 10 CFR 50, Appendix G.
We have noted that you have used a production factor of 75% from the date of your submittal until the end of life of the plant to calculate the maximum RTPTS on the limiting beltline reactor vessel material.
The enclosed NRC staff 8117 "130425 'e2O 8702 720 PDR
-2 Safety Evaluation calculated the maximum RT using the.80% capacity factor which was assumed in the development of the PS rule. Even with this more conservative assumption, the resulting RT is below our screening criterion. We consider this issue to be Uolved for the SONGS-1 facility, thus completing action on our TAC No. 59980.
Sincerely, Richard F. Duley, Project Manager Project Directorate #1 Division of PWR Licensing-A
Enclosure:
As Stated cc's:
See Next Page Office:
PM/PAD#1 RS A W PD/PAD#1 Surname:
RDudley/tg Berlinger CER i
GLear-
) 1Oj Date:
01/30/87 02/2/87
/
/ 7
Mr. Kenneth P. Baskin San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc Charles R. Kocher, Assistant Joseph 0. Ward, Chief General Counsel Radiological Health Branch James Beoletto, Esquire State Department of Health Southern California Edison Company Services Post Office Box 800 714 P Street, Office Bldg. 8 Rosemead, California 91770 Sacramento, California 95814 David R. Pigott Mr. Hans Kaspar, Executive Director Orrick, Herrington & Sutcliffe Marine Review Committee, Inc.
600 Montgomery Street 531 Encinitas Boulevard, Suite 105 San Francisco, California 94111 Encinitas, California 92024 Mr. Stephen B. Allman Ann C. Vasques, Chief San Diego Gas & Electric Company Radiological Programs Division P. 0. Box 1831 Governor's Office of Emergency Svcs.
San Diego, California 92112 State of California 2800 Meadowview Road Sacramento, CA 95832 Resident Inspector/San Onofre NPS c/o U.S. NRC 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 San Diego, California 92101 Director Energy Facilities Siting Division Energy Resources Conservation &
Development Commission 1516 - 9th Street Sacramento, California 95814 Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane Walnut Creek, California 94596