ML13317A560
| ML13317A560 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/02/1983 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR LSO5-83-004-005, LSO5-83-4-5, NUDOCS 8304060226 | |
| Download: ML13317A560 (3) | |
Text
April 2, 1983 Docket No. 50-206 LS05-83-004-005 Mr. R. Dietch, Vice Prisident Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
SUBJECT:
SAN ONOFRE - SEP TOPIC 111-6, SEISMIC DESIGN CONSIDERATIONS REQUEST FOR ADDITIONAL INFORMATION ON VERTICAL GROUND MOTION As part of the staff's review of the seismic reanalysis of San Otdfre Unit 1, new information has become available which relates to the definition of the vertical response spectrum. Consequently, we request that you respond to the enclosed request for additional information within 45 (cays following your receipt of this letter.
The reporting requittement contained in this letter afficts fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Original signed by/
Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
As stated cc w/enclosure:
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Mr. R. Dietch, Vice Pred nt Docket No. 50-206 Nuclear Engineering and Operations San Onofre 1 Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770 cc Charles R. Kocher, Assistant General Counsel James Beoletto, Esquire Southern California Edison Company.
Post Office Box 800 Rosemead, California 91770 David R. Pigott Orrick, Herrington & Sutcliffe 600 Montgomery Street San Francisco, California 94111 Harry B. Stoehr San Diego Gas & Electric Company Post Office Box 1831 San Diego, California 92112 Resident Inspector/ San Onofre NPS c/o U.S. Nuclear Regulatory Commission Post Office 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 California Department of Health ATTN:
Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 U.S. Environmental Protection Agency Region IX Office ATTN:
Regional Radiation Representative 215 Freemont Street San Francisco, California 94111 Robert H. Engelken, Regional Administrator U.S. Nuclear Regulatory Commission, Region V 1450 Maria Lane Walnut Creek, California 94596
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION Recent work by K. W. Campbell of TERA Corporation on near source vertical acceleration data (Campbell, 1982) indicates that the ratio of peak vertical acceleration to peak horizontal acceleration was found to exceed a value of two-thirds for earthquakes at fault distances less than 10 to 25 kilometers and to exceed unity at the higher magnitudes for distances less than about 5 kilometers. For SONGS 1 conditions (magnitude Ms = 7 earthquake at 8.
kilometers) the Campbell (1982) prediction of the mean vertical peak acceleration is about 13 percent less than the TERA mean horizontal peak acceleration as presented in the June 1982 SONGS 1 submittal (Southern California Edison Company, 1982).
The SONGS 1 vertical reanalysis response spectrum, however, is 33 percent less than the SONGS 1 horizontal reanalysis spectrum at all frequencies.
In view of this, address the adequacy of the SONGS 1 vertical reanalysis response spectrum. Specifically take into consideration the fact that the SONGS 1 horizontal reanalysis response spectrum was justified by using empirically and theoretically derived spectra that have mean plus one-sigma spectral values which exceed the 0.67g Housner design spectrum even though they have peak accelerations less than 0.67g.
Your response should indicate the extent, if any, to which the Campbell study was considered in TERA's justification for the SONGS 1 reanalysis response spectrum. If it was -not considered, please indicate why. Further, provide any other information concerning the development of the vertical peak acceleration and/or spectral values for the SONGS 1 reanalysis that has not already been submitted to the NRC.
References Campbell, K. W., 1982, A study of near-source behavior of peak vertical acceleration, EOS Transactions, American Geophysical Union, Vol. 63, No.
45, November 9, 1982.
Southern California Edison Company, 1982, Comparison of 2/3-g.Housner reanalysis spectrum with multiple regression analysis of spectral values San Onofre Nuclear Generating Station, June 1982.