ML20213D727
| ML20213D727 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 05/20/1981 |
| From: | Knight J Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0360, CON-WNP-360 NUDOCS 8105290308 | |
| Download: ML20213D727 (2) | |
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MEMORANDUM FOR: Robert L. Tedesco, Assistant Director 3
for Licensing Skim Division of Licensing
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James P. Knight, Assistant Director S9 S)-
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for Components and Structures Engineering j/,/
Division of Engineering
SUBJECT:
REQUEST FOR DESIGN DATA ON WPPSS 2 STEEL CONTAINMENT BUILDING l
The Structural Engineering Branch has a technical assistance contract with l
Lockaeed Co. to investigate the buckling potential of steel containment
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shells. WPPSS 2 is one of the two plants that have been selected as the I
b&chmark problems for the study. Therefore, we need your assistance in obv.iqing the pertinent design information from the applicant. We note that, the apr.11 cant has agreed to provide the data to us but needs a let$r from the NRC requesting such data.
Atuched is the information we need for our study. This request was transmitted to you before (letter fron F. P. Schauer to B. J. Youngblood, Octccer 27, 1980 and letter from S. D. Kim to H. P. Lynch September 30,1980).
However, content of information requested is somewhat modified evolving from better defined objectives of the study since our first request seven months
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ano. We believe this study is very important from the standpoint of both plant review as well as generic resolution for the following reasons:
1.
The item is identified as NRR generic issue.
L 2.
Our independent consultant, International Structural Engineers, noted possible problems in calculation of steel containment bucklings.
3.
One of the Allens Creek's contention by intervenor was on this subject.
We will appreciate your assistance in obtaining the requested information by June 22, 1981.
l Original Sicnnd By:
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JamesT. Micht James P. Knight, Assistant Director for Components and Structures Engineering
'/f Division of Engineering
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ENCLOSURE 1.
Support conditions of the steel containment shell at foundation.
2.
Geometry of all stiffeners; method by which the stiffeners are attached to the shell wall (continuous welding). Locations of the stiffeners.
3.
Material properties for all structural parts:
a.
Modulus, poisson's ratio b.
Stress-strain curve (for future benchmark runs with plasticity) 4.
Description of mathematical model used to represent the containment geome try.
5.
Are any estimates of sizes and types of imperfections available?
If so, we want this information.
6.
Critical buckling stresses-buckling resisting capacity.
7.
Stress distribution in the shell as a result of worst possible combination of applied loads.
8.
Load combination corresponding to (7) above.
9.
Safety margin.