ML13330B316
| ML13330B316 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/23/1988 |
| From: | Trammell C Office of Nuclear Reactor Regulation |
| To: | Baskin K SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| TAC-67952, NUDOCS 8806030358 | |
| Download: ML13330B316 (3) | |
Text
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May 23, 1988 Docket No. 50-206 DISTRIBUTION Docket File GBagchi NRC & LPDRs LReiter CTrammell DJeng Mr. Kenneth P. Baskin GHolahan Vice President JLee Southern California Edison Company OGC-White Flint 2244 Walnut Grove Avenue PDV Plant File Post Office Box 800 Edordan Rosemead, California 91770 JPartlow ACRS (10)
Dear Mr. Baskin:
SUBJECT:
OPERATING BASIS EARTHQUAKE (TAC NO. 67952)
Re:
San Onofre Nuclear Generating Station, Unit No. 1 We have received your letter of May 4, 1987, subject as above, and have a preliminary question that has surfaced as a result of reviewing background material on this matter.
Our letter of July 11, 1986 transmitted our safety evaluation of the Santzee-y1w1f Onofre 1 seismic reevaluation program..On page 2 of that document, we s-ta-twe that a number of structures at Unit 1 have been added.to the plant and that they were designed to the higher seismic levels consistent with the criteria applied to Units 2-and 3. Specifically the sphere enclosure building and the new diesel generators were designed to a 0.67g modified Nemark response spectrum.
In apparent conflict with this, your May 4 letter states that it is your intention to perform seismic analyses for only the 0.67g modified Housner response spectrum (which is less conservative than the modified Nemark response spectrum) for all future design modifications.
We request that you respond to this observation within 30 days of your receipt of this letter. Meanwhile, our review of other aspects of your letter of May 4 is continuing.
Please contact us if you should have any questions regarding this request.
Sincerely, original signed by Charles Trammell 6806030358 860523 Charles M. Trammell, Senior Project Manager PDR ADOCK 05000206 Project Directorate V P
PDR Division of Reactor Projects -III, IV, V and Special Projects cc w/enc sure:
See ne page D5 D
5 mmell:
o n 1288
,/
/8 8 OFFICIAL RECORD COPY
UNITED STATES 0
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 May 23, 1988 Docket No. 50-206 Mr. Kenneth P. Baskin Vice President Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Baskin:
SUBJECT:
OPERATING BASIS EARTHQUAKE (TAC NO. 67952)
Re:
San Onofre Nuclear Generating Station, Unit No. 1 We have received your letter of May 4, 1987, subject as above, and have a preliminary question that has surfaced as a result of reviewing background material on this matter.
Our letter of July 11, 1986 transmitted our safety evaluation of the San Onofre 1 seismic reevaluation program. On page 2 of that document, we stated that a number of structures at Unit 1 have been added to the plant and that they were designed to the higher seismic levels consistent with the criteria applied to Units 2 and 3. Specifically the sphere enclosure building and the new diesel generators were designed to a 0.67g modified Nemark response spectrum.
In apparent conflict with this, your May 4 letter states that it is your intention to perform seismic analyses for only the 0.67g modified Housner response spectrum (which is less conservative than the modified Nemark response spectrum) for all future design modifications.
We request that you respond to this observation within 30 days of your receipt of this letter. Meanwhile, our review of other aspects of your letter of May 4 is continuing.
Please contact us if you should have any questions regarding this request.
Sincerely, Charles M. Trammell, Senior Project Manager Project Directorate V Division of Reactor Projects -
- III, IV, V and Special Projects cc w/enclosure:
See next page
Mr. Kenneth P. Baskin San Onofre Nuclear Generating Southern California Edison Company Station, Unit No. 1 cc Charles R. Kocher, Assistant Mr. Jack McGurk, Acting 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. Robert G. Lacy Mr. Dennis M. Smith, Chief Manager, Nuclear Radiological Programs Division San Diego Gas & Electric Company Governor's Office of Emergency Svcs.
P. 0. Box 1831 State of California San Diego, California 92112 2800 Meadowview Road Sacramento, California 95832 Resident Inspector/San Onofre NPS 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 E 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, Suite 210 Walnut Creek, California 94596