enclosure 3 random vibration theory (rvt) slides (redacted)generation implementation of random...

Enclosure 3Random Vibration Theory (RVT) Slides

(Redacted)

babcock & wilcox mPower, Inc., a Babcock & Wilcox company

generation

Implementation of Random Vibration Theoryfor Seismic Soil-Structure Interaction

(Redacted Version)This material is based upon work supported by the Deparlmert of Energy wdor Award Number DE-NE0000583.

This report was prepared as an account of work sponsored by an agency of the United Ststee a Gove eLNeither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibilty for the aouascy, compleaness, or usefulness of any informaton, apparatus, product, or process disclosed, or represents thatits use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by bade name, trademark, manufacturer, or otherwise does not necessarily const or imply Its endorsement recommendation, or favoring by the United States Government or any

agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

@ 2013 Babcock & Wilcox mPower, Inc. and © 2013 Bechtel Power Corporation. All Rights Reserved. This document is the property of Babcock & Wilcox mPower, Inc. (B&W mPower) and Bechtel Power Corporation

generationm•oer RVT Topical Report

Presentation Outline

* Introduction / Background

* RVT for SSI Analysis

* Verification

0 Summary and Conclusion

© 2013 Babcock & Wilcox Nuclear Energy, Inc. and © 2013 Bechtel Power Corporation. All rights reserved. 2

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mPower RVT Topical Report

Introduction / Background

• Current practice for seismic SSI analysis utilizes time historiesgenerated to match design response spectra

" Several methods are available to generate time histories

" The number of time histories required to obtain a stable meanresponse has been challenged recently in several studies involving SSIanalysis

" The new ASCE 4 standard to be issued in 2013/2014 [

]

" The newly issued draft SRP 3.7.1 asks for closer inspection of powerspectral density before a time history is used for design

[CCI per Affidavit 4(a)-(d)]


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mpower RVT Topical Report

Introduction / Background" The choice of appropriate seed time histories for CEUS sites is very

limited" Structural responses can vary considerably depending on the time

history used as input, even when the input time histories are matchedto the same design response spectrum

" For design, mean seismic responses are required" Obtaining stable mean structural responses with limited time histories

is challenging* The RVT methodology avoids using time histories as input and works

directly with the design response spectrum

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7ZM~ower RVT Topical Report

Introduction / Background

" RG 1.208 permits RVT-based site amplification analysis" RVT has been used in several recent COL applications for site

response analysis and development of GMRS and FIRS

" The NRC has evaluated the RVT approach used by COL applicants byan independent program based on the RVT approach as reported inSERs

* One of the early applications of RVT for SSI analysis wasthe computer program PLUSH (1977)

formulated in


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mAower RVT Topical Report

RVT Approach

The main computational steps in the RVT approach are:

[

I[CCI per Affidavit 4(a)-(d)]


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RVT Approach

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RVT Formulation

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RVT Formulation

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RVT Process Steps[



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RVT Process Steps[

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© 2013 Babcock & Wilcox Nuclear Energy, Inc. and @ 2013 Bechtel Power Corporation. All rights reserved. 12

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VERIFICATION

Earlier Discussion on[ ] (May 2012)

RVT Topical Report Examples

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mnPower SASSI2010 - RVT

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19© 2013 Babcock & Wilcox Nuclear Energy, Inc. and © 2013 Bechtel Power Corporation. All rights reserved.

generationm•oer SASSI2010 - RVT

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" RVT has been used extensively for development of GMRSand FIRS

" A number of Safety Evaluation Reports have endorsed theresults of RVT for site response analysis

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1Power RVT Summary

* Obtaining mean seismic responses for design using the timehistory approach would require multiple sets of time histories

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Discussions


enclosure 3 random vibration theory (rvt) slides (redacted)generation implementation of random...

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