ML19260C452
| ML19260C452 | |
| Person / Time | |
|---|---|
| Issue date: | 07/23/1979 |
| From: | Tan C Office of Nuclear Reactor Regulation |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-03, REF-GTECI-A-04, REF-GTECI-A-05, REF-GTECI-SG, TASK-A-03, TASK-A-04, TASK-A-05, TASK-A-3, TASK-A-4, TASK-A-5, TASK-OR NUDOCS 8001030461 | |
| Download: ML19260C452 (1) | |
Text
..
f[tv"IGu %,
IJNITED SfATES NUCLEAR REGULATORY COMMisslON g
[
- V ( l @
WASHINGTON, D. C. 20555
- 4' C
. t JUL 2 31979 MEMORANDUM FOR:
J. Zwolinski Containment Systems Branch Division of Systems Safety FROM:
C. P. Tan Structural Engineering Branch Division of Systems Safety
SUBJECT:
CONTAINMENT RESPONSE TO MSLB ASSUMING STEAM GENERATOR TUBE FAILURES This is to confirm our telephone conversation on July 20, 1979, with respect to the maximum allowable containment pressure mentioned in your July 11, 1979, memo to J. Strosnider of DOR. In the above telephone conversation, I commented on your statement that the maximum allowable containment pressure for either a steel vessel or a reinforced concrete vessel based on the ultimate strength of steel is approximately 2.75 times the containment design pressure, may not be appropriate. Although maintenance of containment structural integrity is a necessary condition for containment integrity, it is not a sufficient condition by itself. This is due to the fact that the function of the containment structure is to limit the release of radioactive material, which depends more on the leaktight integrity of a containment than on its structural integrity. The leaktight integrity is more reliably assured at yield limit of steel rather than at its ultimate strength. Therefore, instead of the.2.75 times the containment design pressure mentioned in your meacrandum lower value of say 1.5 times the containment design pressure should be used.
It should be noted that the above suggested factor of 1.5 was based on prelim-inary analysis using several simplified assumptions.
k0 C. P. Tan Structural Engineering Branch Division of Systems Safety cc:
S. Hanauer /
D. Pickett L. Soffer R. Denise J. Kudrick K. Parczewski D. Eisenhut V. Noonan F. Odar M. Aycock J. Strosnider F. Almeter F. Schauer Z. Rosztoczy E. Adensan W. Butler P. Check D. Jeng d
03
(
8001 1701 036