ML13330B135
| ML13330B135 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/21/1986 |
| From: | Medford M, Pilmer D Southern California Edison Co |
| To: | Lear G Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML13330B136 | List: |
| References | |
| TASK-03-02, TASK-03-04.A, TASK-3-2, TASK-3-4.A, TASK-RR NUDOCS 8612010098 | |
| Download: ML13330B135 (2) | |
Text
Southern California Edison Company P. O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 M. 0. MEDFORD TELEPHONE MANAGER OF NUCLEAR ENGINEERING (818) 302-1749 AND LICENSING November 21, 1986 Director, Office of Nuclear Reactor Regulation Attention:
Mr. George E. Lear, Director PWR Project Directorate No. 1 Division of PWR Licensing - A U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 SEP Topics:
111-2, Wind and Tornado Loadings III-4.A, Tornado Missiles San Onofre Nuclear Generating Station Unit 1
Reference:
Letter, M. 0. Medford, SCE, to G. E. Lear, NRC, SEP Topics: 111-2, Wind and Tornado Loadings, III-4.A, Tornado Missiles, October 10, 1986 The referenced letter provided the NRC with the final report of SCE's review of the tornado resistance capability at San Onofre Unit 1. The report was provided to resolve the subject SEP topics for San Onofre Unit 1. Recent discussions with the NRC staff indicated a need for one of the documents referenced by the report. Accordingly, find enclosed the requested document entitled, "Tornado Resistance Design Review Criteria, San Onofre Nuclear Generating Station Unit 1, DC-85028-01, Rev. 0, October, 1985.".
The enclosed document describes in detail the criteria applied during the tornado resistance design review for San Onofre Unit 1. It should be noted that the probabilistic evaluation methodology described in the enclosed report was not used in the final effort that is described in the report enclosed with the referenced letter. The probabilistic methodology utilized the TORMIS code, which proved to have limitations due to the large amount of 8612010098 861121 PDR ADOCK 05000206 P
-f o
Mr. George November 21, 1986 exposed equipment at San Onofre Unit 1. The TORMIS code is better suited to an application where the equipment is enclosed in a small number of buildings. Therefore the references to the probabilistic evaluation methodology or the TORMIS code in the enclosed report should be disregarded.
If you have any questions, please let me know.
Very truly yours, Enclosure cc: R. F. Dudley, NRC/NRR San Onofre Unit 1 Project Manager E. McKenna, SEP Project Manager F. R. Huey, NRC Senior Resident Inspector, Units 1, 2 and 3
- 3. B. Martin, Regional Administrator, NRC Region