ML20213D271
| ML20213D271 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 07/07/1980 |
| From: | Schauer F Office of Nuclear Reactor Regulation |
| To: | Yopungblood B, Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0304, CON-WNP-304 NUDOCS 8008190121 | |
| Download: ML20213D271 (2) | |
Text
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',/ CENTRAL FILE iOdb,Nb$ bb. [U.E CDR JUL 7 1980 o47
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MDf0RANDUM FOR:
B. J. Youngblood, Chief Licensing Projects Branch, DL FROM:
Franz P. Schauer, Chief Structural Engineering Branch, DE f
SUBJECT:
WPPSS-2 SACRIFICIAL SHIELD WALL (SSW) CORRECTIVE s
ACTION PLAN In accordance with your request the Structurni Engine 2 ring Branch has reviewed Burns and Roe Technical Memorandum No. 1173 which providee Justification for the une of the partial penetration weld between SSV rings 3 and 4 including SSW as-built dinension consideration. However, we do not have adequate background information of the problem such ao those references listed in the Technical Memorandum No. 1173, and are i
therefore at difficulty in performing an in-depth review. Furthermore, it appears that the corrective measures to be taken to transmit shcan at the interface of the channel and box rings are based on the idealistic
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distribution of design loads instead of the actual ~ defective conditions.
t On this account we request the following additional information in order to complete our review on the SSU corrective action plant i
1.
References 1 thru 4 stated in Burns and Roe Technical Memorandum l
No. 1173, dated Ifarch 19, 1990.
2..
Detailed drawings of the sacrificial shield wall. Identify the i
type, nature, size, location and description of all defects, cracks, i
irregularities, or damages that exist in the sacrificial. shield wall and its reinted structures.
3.
Calculation of design loads and load combinations, stress analyses i
of both the design structuro and the as-built structure with iden-l tified defects. Identify any redistribution of loads in the strue-ture and at the box ring interfaces. Locate all the contact bearing areas at the interfaces. List all the assunptions and postulations used in the analyses.
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! We also suggest a meeting with the applicant to expedite the understanding and resolution of the problem.
Franz P. Schauer, Chief Structural Engineering Branch Division of Engineering 1
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J. Faiaht R. L. Tedesco I
D. Jeng D.' Lynch l
S. Chan 1
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