ML13330A078
| ML13330A078 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/13/1980 |
| From: | Haynes J Southern California Edison Co |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML13330A079 | List: |
| References | |
| TASK-03-06, TASK-3-6, TASK-RR NUDOCS 8008150196 | |
| Download: ML13330A078 (2) | |
Text
Southern California Edison Company P.O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 August 13, 1980 Director of Nuclear Reactor Regulation Attention:
D. M. Crutchfield, Chief Operating Reactors Branch #5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Site Specific Earthquake Program San Onofre Nuclear Generating Station Unit 1 At a meeting with the NRC Staff on March 4, 1980, we discussed a proposed program to further validate the earthquake model against data recorded during the 1979 Imperial Valley and Coyote Lake earthquakes. The results of these studies were discussed in detail with the NRC Staff during a meeting on July 24, 1980. Enclosed are twenty-five (25) copies of a report entitled, "Simulation of Earthquake Ground Motions for San Onofre Nuclear Generating Station Unit 1, Supplement III," which documents the completed program.
During the July 24, 1980 meeting, refinementsto the original model were presented and discussed. These refinements were made in order to permit the more accurate prediction of recorded data from a single earthquake; namely, the 1979 Imperial Valley earthquake. SCE's consultant, Del-Mar Technical.Associates, expressed reservation with accepting all such refinements as generic improvements to the model. Notwithstanding our consuitant's reserva tion with regenerating site specific spectra for the San Onofre site with the model including the Imperial Valley refinements, SCE had such spectra generated. These spectra were presented-in the meeting and are reflected in the enclosed report.
The site specific spectra generated by the computer modelz b c
with refinements have been compared against the 2/3g Housner response spectra. Enclosed are twenty-five (25) copies of a report entitled.AP4 "A Comparative Evaluation of the San Onofre Site Specific Earthquake Spectra with the 2/3g Housner Seismic Reevaluation Spectra."
It is a Oti8o 50
-2 concluded in this report that there is no impact by the site specific spectra with refinements on the previous reevaluation of structures and equipment at San Onofre Unit 1. Moreover, it.is further concluded that the 2/3g Housner response spectra are -the appropriate spectra for use in the seismic reevaluation of the balance of plant at SanOnofre Unit 1.
If you have any questions regarding this information, please contact me.
Very truly yours, J. G. Haynes Chief of Nuclear Engineering Enclosure