ML13324A681
| ML13324A681 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/24/1985 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0829, RTR-NUREG-829, TASK-03-02, TASK-03-04.A, TASK-3-2, TASK-3-4.A, TASK-RR NUDOCS 8507290353 | |
| Download: ML13324A681 (2) | |
Text
Southern California Edison Company P. 0. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 M. 0. MEDFORD TELEPHONE MANAGER, NUCLEAR LICENSING July 24, 1985 (818) 302-1749 Director, Office of Nuclear Reactor Regulation Attention:
Mr. 3. A. Zwolinski, Chief Operating Reactors Branch No. 5 Division of Licensing 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
References:
111-2, Wind and Tornado Loadings, III-4.A Tornado Missiles, September 17, 1984
- 2. NUREG 0829, Integrated Plant Safety Assessment Systematic Evaluation Program, San Onofre Nuclear Generating Station, Unit 1, Southern California Edison Company, Docket No. 50-206, Draft Report, April 1985 Reference 1 provided you with our plan of action to determine the site-specific design basis tornado event. We stated that an evaluation would be performed to demonstrate that there is adequate resistance for smaller tornado loadings and that the risk associated with larger tornado loadings is acceptable. The completion schedule for this effort was contingent upon October 1, 1984 startup of San Onofre Unit 1. Since the startup was actually November 27, 1984 and the gathering of data for the project involved more effort than originally anticipated, the revised completion date is now expected to be October 15, 1985.
It is also noted that the discussion on page xvi of Reference 2 indicates that we have not agreed to provide a safe shutdown path which is protected from tornado missiles. It should be noted that we do intend to provide a safe shutdown path for the yet to be determined design basis tornado event.
The scope of the above discussed evaluation includes tornado missiles B507290353 850724 I
PDR ADOCK 05000206 F
Mr. 3.
July 24, 1985 and the conclusion of this effort will identify upgrades necessary to provide a safe shutdown path which is adequate to assure shutdown after a design basis tornado event, including consideration of wind and missile effects.
If you have any questions regarding the above discussed information, please let me know.
Very truly yours,