ML20213D306
| ML20213D306 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 09/25/1980 |
| From: | Schauer F Office of Nuclear Reactor Regulation |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-0313, CON-WNP-313 NUDOCS 8010070649 | |
| Download: ML20213D306 (2) | |
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DISTRIBUTION i
/ CENTRAL FILE NRR READING FILE SEP 2 5 50 SEB READING FILE F. Schauer.
Docket ilo. 50-397 4
i MEMORAflDUM FOR: Billy J. Youngblood, Chief I
Licensing Branch fio. 1 Division of Licensing FROM:
Franz P. Schauer, Chief Structural Engineering Branch Division of Engineering
SUBJECT:
UPPSS-2 SACRIFICIAL SHIELD UALL (SSU) CORRECTIVE ACTIO:i PLAN i
F.EFEREI:CES:
1.
" Engineering Evaluation of the U! P-2 Sacrificial Shield i
Uall" by UPPSS August 1900.
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2.
" Engineering Evaluation of the UUP-2 Sacrificial Shield Wall, Supplement i:o.1" transmittal by the '.!PPSS to fiRC letter. G02-80-102, August 19, 1930.
In accordance with your request the Structural Engineering Branch has reviewed the portion of the subject references that can'cerns the structural aspects of the SSU corrective action plan. He find that there.are several items regarding load and stress analysis need clarification and that i
additional information is required before we can complete cur review.
The additional infornation requested, which concerns structural aspects, is contained in the enclosure.
In order to expedite the review procecure, our request for inf.ormation has been transmitted to the applicant via telex through the letter from Tedesco (!:RC) to Fergusen ('.:PP55) on Septer.ber 19, 1930.
i Franz P. Schauer, Chief Structural Engineering Branch Civision of Engineering CONTACT: S. Chan x29460
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Enclosure:
Request for Additional Information
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WPPSS-2 SACRIFICIAL SHIELD WALL REQUEST FOR ADDITIONAL IriFORMATION 1.
Provide typical welding details for the column splice plates, the skin plates, and the shim plates at the construction. joint in the sacrificial shield wall (SSW) at elevation 541'-5".
These details should include the size and length of welds and an indication whether the welds are continuous or intermittent.
Indicate the maximum total loads which are transferred at this joint.
2.
The tangential shear in the ring channel above and below the 541' construction joint in the SSW is taken up equally by the inner and outer skin plates while your proposed corrective weld is only on the outer skin plate. Accordingly, describe the redistribution of loads at the 541' construction joint.
Identify the structural elements which resist the localized bending moment due to this " side-stepping" of the tangential shear introduced by your proposed corrective weld at this construction joint. Explain in detail how all the structural loads are transmitted to the box ring below this construction joint.
3.
You indicate in the Enclosure to Attachment 4 of your report that the seismic loads used in your analysis of the partial penetration weld, are based on your current definition of seismic loads and not on the original' seismic loads used to design the sacrificial shield wall.
Provide a complete list of both your original and current seismic loads.
Indicate the differences in your assumptions and your methods of analysis for.these two sets of seismic loads.
4.
In Technical Memorandum No. 1183, you state that the design response spectra at all mass point of your mathematical model of the reactor building were generated in your soil-structure interaction analysis.
Our present licensing position requires that you analyze the soil-structure interaction using both the half-space (lumped spring-mass or compliance function) methodology and the shear beam, finite element representation of the soil foundation. Our concern in this matter is that the results obtained by the finite element approach l
using the deconvolution procedure and the FLUSH computer program, may not be acceptable. Accordingly, we require that all seismic loads and the corresponding design respense spectra be recalculated by employing a half-space, soil spring model and that you adopt the higher values calculated by either of the two methods discussed above.
5.
In the last part of Attachment 4, " Analysis and Design of Sacrificial Shield Wall," you state that the inner and outer skin plates are treated as a single plate having a thickness equal to the combined thickness of both plates. Such an assumption is incorrect for out-of-plane bending. Additionally, it is not clear in your report what type of plate element and the associated boundary conditions for these plate elements, are used in your computer model.
Indicate whether the plate elements at the interface are treated differently for the free edges of the as-built structure.
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