ML13330B562
| ML13330B562 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/26/1991 |
| From: | Rosenblum R SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML13329A753 | List: |
| References | |
| TASK-03-07.B, TASK-3-7.B, TASK-RR NUDOCS 9109300176 | |
| Download: ML13330B562 (2) | |
Text
Southern California Edison Company 23 PARKER STREET IRVINE, CALIFORNIA 92718 R. M. ROSENBLUM TELEPHONE MANAGER OF September 26, 1991 (714) 454-4505 NUCLEAR REGULATORY AFFAIRS U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
Subject:
Docket No. 50-206 Containment Structure Buckling Analysis, SEP Topic III-7.B San Onofre Nuclear Generating Station Unit 1
References:
- 1. Lo, Ting-Yu, "Systematic Evaluation Program Structural Review of the San Onofre Nuclear Generating Station Unit 1 Containment Structure Under Combined Loads," Lawrence Livermore National Laboratory Report UCID 19141, May, 1982.
- 2. Letter, M. 0. Medford (SCE) to D. M. Crutchfield (NRC),
"Systematic Evaluation Program Integrated Assessment,"
March 30, 1984.
A copy of our recently completed buckling analysis for the SONGS 1 containment structure (SCE Calculation No. DC-3608, revision 0) is enclosed to support your review concerning Systematic Evaluation Program Topic III-7.B, Design Codes, Criteria, and Load Combinations. As recommended in Reference 1, the finite element analysis was completed to document the ability of the containment to resist buckling due to thermal loading during an accident.
The enclosed calculation, in conjunction with an earlier assessment on this subject (Reference 2), demonstrates that the containment structure is not susceptible to buckling failure as a result of thermal loading. The analysis determined that the containment sphere wall temperature would have to reach a minimum of 340*F before buckling instability could occur. This buckling threshold temperature is much higher than the maximum sphere wall temperature predicted by our safety analyses (less than 280*F for both loss of coolant and steamline break accidents).
Therefore, the SONGS 1 containment structure has adequate margin for resisting buckling failure as a result of an accident.
-9109300176 9109:26 PDR ADOCK 05000206
-P
- D
Document Control Desk
-2 If you have any further questions on this matter, please let me know.
Very truly yours, Enclosure cc:
J. B. Martin, Regional Administrator, NRC Region V George Kalman, NRC Senior Project Manager, San Onofre Unit 1 J. 0. Bradfute, NRC Project Manager, San Onofre Unit 1 C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2&3