ML20010B014
| ML20010B014 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Callaway  |
| Issue date: | 08/10/1981 |
| From: | Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20010B015 | List: |
| References | |
| SLNRC-81-62, NUDOCS 8108130219 | |
| Download: ML20010B014 (3) | |
Text
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SNUPPS Standardized Nuclear Unit Power Plant System 5 Choke Cherry Road Nicholas A. Petrick Rockville, Maryland 20650 Executive Director (301)8694010 August 10, 1981 SLNRC 81 62 FILE: 0541 SUBJ: Seismic Analysis Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Docket Nos. STN 50-482, STN 50-483, and STN 50-486
Reference:
NRC Summary of Meeting Held on May 3,1981 with Wolf Creek and Callaway Applicants, dated May 8, 1981
Dear Mr. Denton:
In a meeting on May 5,1981, the NRC's Structural Engineering Branch requested that additional seismic analyses be performed. The reference documented the NRC's request. Enclosure 1 is an FSAR change that notes the results of the additional analyses. This change will be incorporated in the next FSAR revision. Enclosure 2 is a report on the comparison of finite element and lumped mass seismic analysis methods prepared by Bechtel Power Corporatior.. This report satisfies the NRC request made at the May 5,1981 meeting.
Very truly yours, k,g Nicholas A. Petrick e
RLS/vas
Enclosures:
- 1. FSAR Change S
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- 2. Seismic Report NLIJy I
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Endos.1 SNUPPS I
Models, typically shown in Figure 3.7(B)-13, were used to perform soil-structure interaction analyses for all four sites.
For each site, the site dependent soil properties l
were used.
The vertical dimension of each soil element is eqsa3 to or less than Cs/5f, where Cs is the lowest soil element shear wave velocity reached during iterations and f is the highest frequency of interest to be transmitted I
through the soil profile.
The highest frequency used was 25 Hz.
In the analyses for the same buildings with site dependent soil parameters, the structural elements remained unchanged.
The site dependent soil properties consisted of strain 1
4 dependent damping and modulus relationships for each material.
In general, the soil properties are nonlinear in character.
An iterative process was used to obtain equivalent linear properties which are strain dependent.
The methods generally used for such an analysis are included in the computer l T.Nsco program FLUSH.
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J 3.7(B).2.5 Development of Floor Response Spectra s
Acceleration time histories obtained from the FLUSH finite element analyses were used in computing the floor response i
spectra for the major seismic Category I structures.
The spectra were generated following the procedures outlined in l
Section 5.2 of BC-TOP-4-A, using the SPECTRA computer program (see subparagraph 3.8A.12).
3.7(B).2.6 Three Components of Earthquake Motion Procedures for considering the three components of earthquake motion in determining the seismic response of structures, l
systems, and components follow the recommendations of Regulatory Guide 1.92 and are described in Section 4.3 of BC-TOP-4-A and Section 5.1 of BP-TOP-1.
3.7(B).2.7 Combination of Modal Responses combination is done according to the criterion of "the square-root-of-the-sum-of-the-squares" (SRSS).
Section 4.2.1 of SC-TOP-4-A describe the techniques used to l
i combine modal responses for structures and equipment.
Sec-I tions 5.1 and 5,2 of BP-TOP-1 describe the criteria used for piping systems.
3.7(B).2.7.1 Significant Dynamic Response Modes d
The static load equivalent or static analysis method involves the multiplication of the total weight of the equipment or component member by the specified seismic acceleration.
Multiple I
i degree-of-freedom systems which may have had frequencies in the resonance region of the amplified response spectra curves 3.7(B)-7 Rev. 1 3
9/80
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u INSERT A seismic analysis utilizing a lumped mass model on an elastic half space with strain independent soil properties was performed for com-parison with the FLUSH finite element results. The purpose of this comparison was to provide a check on the FLUSH analysis. The response spectrum curves obtained by utilizing elastic half space analytical techniques compared favorably with the envelope curves developed for design use on the SHUppS project.
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