ML13330A314
| ML13330A314 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/09/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Dietch R Southern California Edison Co |
| References | |
| LSO5-81-02-020, LSO5-81-2-20, NUDOCS 8105040005 | |
| Download: ML13330A314 (3) | |
Text
DISTRIBUTION February 9, 1981 Docket NRC PDRX%
- 6.
Local-PDR N
Docket No. 50-206 ORB Reading LSO5-81-02-020 DEt bseht TR-0-ak Mr. R. Dietch RTe ds-co Vice President GLainas Noclear Engineering and Operations DCrutchfield Southern California Edison Company HSmith 2244 Walnut Grove Avenue SNowicki Post Office Box 800 OELD Rosemead, Chlifornia 91770 OI&E (3)
Dear Mr. Dietch:
TERA ACRS (16)
Due to 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. 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. You may contider 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 C/R 0098, "Development of Criteria for Seismic Review ff,'Selected Nuclear Power Plants" in performing your reanalysis.
If the final staff decision on seismic input ground motion results in a spectrum greater than 2/3g Housner the margins that are shown to exist in the structures, systems and components at the 2/3g Housner Spectrum could be used as justification to preclude reanalysis at the higher spectrum.
We request your response within 20 days indicating your intent with respect to continued reanalysis.
Sincerely, Original signed by Dennis M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing cc:
See next page
-1 0 50 4e0g 5
Aoo OFFI.CE DL:
DL: SEPB DE:
GLrn SURNAMEOSNoii
- cc TChenwc' s
J DE ut DATE NRC FORM 318 10 80 NRCM 0240 OFFICIAL RECORD COPY USGP0 1980-329824
- 4.
1UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 February 9, 1981 Docket No.
50-206 ThS05-8I-02-020 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 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. 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. 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 "Develo ment :
dCe oeaid NUREG C/R 0098,"eeomnofCira for Seismic Review of-Selected Nuclear Poe lns nproming your reanalysis.
If the final staff decision on seismic input ground motion results in a spectrum greater than 2/3g Housner the margins that are shown to exist in the structures, systems and components at the 2/3g Housner Spectrum could be used as justification to preclude reanalysis at the higher spectrum..
We'request your response within 20 days indicating your intent with respect to continued reanalysis.
Si cerely, Dennis M. Crutchfield, ef Operating Reactors Branch 5 Division of Licensing cc:
See next page...
Mr. February 9, 1981 ea cc Charles R. Kocher, Assistant Director, Criteria and Standards General Counsel.
Division Southern California Edison Company Office of Radiation Programs Post Office Box 800 (ANR-460)
Rosemead, California 91770 U. S. Environmental Protection Agency David R. Pigott Washington, D. C. 20460 Samuel B. Casey Chickering & Gregory U. S. Environmental Protection Three Embarcadero Center Agency Twenty-Third Floor Region IX Office San Francisco, California 94111 ATTN: EIS COORDINATOR 215 Freemont Street Jack E. Thomas San Francisco, California 94111 Harry B. Stoehr 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
-. GCity.of San Clemente San Clemente, California 92672 Chai rman 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, Caifornia-95814