ML13330A250
| ML13330A250 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/15/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| LSO5-81-03-031, LSO5-81-3-31, NUDOCS 8103190516 | |
| Download: ML13330A250 (5) | |
Text
March 15, 1981 Docket No. 50-206 LS05-81-03-031 Mr. R. Dietch, Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
Due to a resource limitations caused by contested seismic hearings the staff final decision on the QNGS 1 seismic input ground motion has been delayed. Based upon our review of the information that you presented in the December 4, 1980 meeting, it does not appear likely that an acceptable free field spectrum will be lower than the 2/3g Housner Spectrum. However, you may consider the recent NRC guidelines for performing Soil Structure Interaction Analysis which provide limits for reduction of input motion at the structure foundation and the guidance contained in NUREG/CI R0098, "Development of Criteria for Seismic Review of Selected Nuclear Power Plants" in performing your reanalysis.
You should continue your seismic reanalysis program using the 2/3g Housner ground response spectrum as directed by our August 4, 1980 letter until the final NRC staff decision is made.
If our final decision on seismic input ground motion is greater than 2/3g Housner spectrum, we would evaluate the margins that are shown to exist in the structures, systems and components to determine if reanalysis using a higher spectra is necessary.
We request yourcre sponse within 20 days indicating your intent with respect to continued reanalysis.
Sincerely, Original signed bY Dennis M. Crutchfield Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing cc: See next page SEPB.DLS NFFICEO s PB: L R M O24L E F I
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 March 15, 1981 Docket No. 50-206 LS05-81-03-031 Mr. R. Dietch, Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
Due to a resource limitation caused by contested seismic hearings the staff final decision on the SONGS 1 seismic input ground motion has been delayed. Based upon our review of the information that you presented in the December 4, 1980 meeting, it does not appear likely that an acceptable free field spectrum will be lower than the 2/3g Housner Spectrum. However, you may consider the recent NRC guidelines for performing Soil Structure Interaction Analysis which provide limits for reduction of input motion at the structure foundation and the uidance contained in NUREG/CR -0098, "Development of Criteria for Seismic Review of Selected Nuclear Power Plants" in performing your reanalysis. You should continue your seismic reanalysis program using the 2/3g Housner ground response spectrum as directed by our August 4, 1980 letter until the final NRC staff decision is made.
If our final decision on seismic input ground motion is greater than 2/3g[Housner spectrum, we would evaluate the margins that are shown to exist in the structures, systems and components to determine if reanalysis using a higher spectra is necessary.
We request your response within 20 days indicating your intent with respect to continued reanalysis.
Sincerely, Dennis M. Crutchfield, C ef Operating Reactors Branch No. 5 Division of Licensing cc: ;See next page
Mr. SAN ONOFRE NUCLEAR GENERATION STATION, UNIT NO. 1 DOCKET NO. 50-206 cc:
Charles R. Kocher, Assistant Director, Technical Assessment General Counsel Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (AW-459)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Crystal Mall #2 SSamuel B. Casey Arlington, Virginia 20460 Chickering & Gregory Three Embarcadero Center U. S. Environmental Protection Twenty-Third Floor Agency San Francisco, California 94111 Region IX Office ATTN:
EIS COORDINATOR Jack E. Thomas 215 Freemont Street Harry B. Stoehr San Francisco, California 94111 San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector c/o U. S. NRC P. 0. Box AA Oceanside, California 92054 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 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
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 March 15, 1981 Docket No. 50-206 LS05-81-03-031 Mr. R. Dietch, Vice President Nuclear Engineering and Operations Southern California Edison Company 2244 Walnut Grove Avenue Post Office Box 800 Rosemead, California 91770
Dear Mr. Dietch:
Due to a resource limitation caused by contested seismic hearings the staff final decision on the SONGS 1 seismic input ground motion has been delayed. Based upon our review of the information that you presented in the December 4, 1980 meeting, it does not appear likely that an acceptable free field spectrum will be lower than the 2/3g Housner Spectrum. However, you may consider the recent NRC guidelines for performing Soil Structure Interaction Analysis which provide limits for reduction of input motion at the structure foundation and the guidance contained in NUREG/CR -0098, "Development of Criteria for Seismic Review of Selected Nuclear Power Plants" in performing your reanalysis. You should continue your seismic reanalysis program using the 2/3g Housner ground response spectrum as directed by our August 4, 1980 letter until the final NRC staff decision is made.
If our final decision on seismic input ground motion is greater than 2/3g Housner spectrum, we would evaluate the margins that are shown to exist in the structures, systems and components to determine if reanalysis using a higher spectra is necessary.
We request your response within 20 days indicating your intent with respect to continued reanalysis..
Sincerely, Dennis M. Crutchfield, C ef Operating Reactors Branch No. 5 Division of Licensing cc:
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-Mr. SAN ONOFRE NUCLEAR GENERATION STATION, UNIT NO. 1 DOCKET NO. 50-206 cc:
Charles R. Kocher, Assistant Director, Technical Assessment General Counsel Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (AW-459)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Crystal Mall #2 SSamuel B. Casey Arlington, Virginia 20460 Chickering & Gregory Three Embarcadero Center U. S. Environmental Protection Twenty-Third Floor Agency San Francisco, California 94111 Region IX Office ATTN:
EIS COORDINATOR Jack E. Thomas 215 Freemont Street Harry B. Stoehr San Francisco, California 94111 San Diego Gas & Electric Company P. 0. Box 1831 San Diego, California 92112 Resident Inspector c/o U. S. NRC P. 0. Box AA Oceanside, California 92054 Mission Viejo Branch Library 24851 Chrisanta Drive Mission Viejo, California 92676 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