United States Nuclear Regulatory Commission - Protecting People and the Environment

An Approach to the Quantification of Seismic Margins in Nuclear Power Plants: The Importance of BWR Plant Systems and Functions to Seismic Margins (NUREG/CR-5076, UCRL-15985, RD, RM)

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Publication Information

Manuscript Completed: April 1988
Date Published:
May 1988

Prepared by:
P.J. Amico

Applied Risk Technology Corporation
P.O. Box 175
Columbia, Maryland 21045

Under Contract to:
Lawrence Livermore National Laboratory
7000 East Avenue
Livermore, CA 94550

Prepared for:
Division of Engineering Technology
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555
NRC FIN No. A0398

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Abstract

In NUREG/CR-4334 ("An Approach to the Quantification of Seismic Margins in Nuclear Power Plants"), the Expert Panel on Quantification of Seismic Margins presented a technique for studying the issue of quantifying seismic margins. As part of that technique, the panel included methods for simplifying the margins assessment by screening out components and systems using both systems and fragilities screening guidelines. At the time of that report, the panel was able to develop fragilities screening guidelines for all plants, however the systems screening guidelines applied only to PWRs (due to a shortage of BWR seismic PRAs upon which to base BWR systems screening guidelines). This report develops the BWR systems screening guidelines by utilizing the results of a number of BWR PRAs which have become available since the publication of NUREG/CR-4334.

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