ML20003E637
| ML20003E637 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 03/25/1981 |
| From: | Dobson D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20003E638 | List: |
| References | |
| GO3-81-854, NUDOCS 8104070449 | |
| Download: ML20003E637 (4) | |
Text
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Washington Public Power Supply System A JOINT CPERATING AGENCY h
March 25,1981 G03-81-854 Docket Nos. 50-508 50-509
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Y Mr. R. L. Tedesco, Assistant Director, Licensing
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U.S. Nuclear Regulatory Comission y
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Cear Mr. Tedesco:
Subject:
PROJECT NOS. 3 AND 5 INFORMATION REQUEST ON CATEGORY I itASONRY WALLS
Reference:
Letter, Steven A. Varga (NRC) to Construction Permit and Operating License Applicants, Same Subject, dated April 21, 1980.
In order to satisfy your request in the above reference letter, the following response is provided concerning the design of Category I masonry walls for WNP-3/5. The numbers correspond to your question numbers.
1.
Yes. Concrete masonry walls are being used in the Reac*ar Auxiliary Building which is a Category I structure.
2.
The loads and load combinations used in the concrete masonry wall design are consistent with the Category I structure design as shcwn below:
Design Loads a)
Dead load (D) b)
OBE load (E)
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c)
SSE load (E')
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'A' Load Combinations f
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D+E Working Stress Design b)
D + E' Ultimate Strength Design pg 8104070 N7 4
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Washington Public Power Supply System Mr. R. L. Tedesco Page Two 3.
The concrete masonry walls have been designed primarily in
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accordance with Chapter 24, Masonry, of Uniform Building Code (UBC),1973 edition, following the Working Stress Design method specified therein. The wall design was further reviewed by the U1 timate Strength Design Method using ACI Building Code
( ACI 3/8-71) as a guide. Based on Ebasco's experience, the concrete masonry block that meet the Supply System Quality Class I requirements are not readily available commerically.
Therefore, all concrete masonry blocks will be procured on the basis of the Supply System Quality Class G requirements, however, with provisions for material certification that assures adequate and consistent strengths as assumed in the design.
Additionally, the bonding mortar, concrete fill, and reinforcing steel to be used in the construction of concrete masonry walls will all be supplied in accordance with the Supply System Quality Class I requirements.
4.
The OBE and SSE loads in masonry walls located within the Reactor Auxiliary Building were determined by using the maximum building accelerations at various floors of interest. The building accelerations have previously been established by the seismic dynamic analyses.
5.
The design criteria adopted for WNP-3/5 prohibits the use of concrete masonry walls for any piping system supports. All masonry walls have been designed for the dead weight and the self-generated seismic loads only, and have not considered any piping support reactions. Typical details of the masonry wall reinforcing are shown in attached Figure 1.
6.
The locatior, of all masonry walls wichin the Reactor Auxiliary Building is shown in the following attached drawings:
i - WPPS-3240 G-3108 Revision 2 Architectural Floor Plans, Sheet 1, EL 390.0' 11 - WPPS-3240 G-3111 Revision 3 Architectural Floor Plans, Sheet 4, EL 335.0' iii - WPPS-3240 G-3112 Revision 2 Architectural Floor Plans, Sheet 5, EL 362.5' and 373.5'
o Washington Public Power Supply System Mr. R. L. Tedesco Page Three a
iv - WPPS-3240 G-3113 Revision 3 Architectural Floor Plans, Sheet 6, EL 349.0' and 349.50' and 351.0' v - WPPS-3240 G-3122 Revision 1 Architectural Details and Sections, Sheet 4 vi - WPPS-3240 G-3125 Revision 0 Architectural Concrete Block Wall Details, Sheet 7 Vii - WPPS-3240 G-?.26 Revision 0 Architectural Concrete Block Wall Details, Sheet 8 This completes our response to the above referenced letter.
Very truly yours,
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D. E. D BSON Program Director (Acting) WNP-3/5 Attachments cc:
D. Smithpeter, BPA WNP-3/5 Files, Richland W. Wo70s, NUS N.S. Reynolds, D & L Ebasco NY (Licensing)
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