The purpose of this paper is to examine the use of probabilistic safety assessment (PSA) tools for evaluating the risk significance of changing plant configurations. The focus of this examination is the ability of current PSA technology to evaluate time-dependent variations in risk quantities. Recent results from the South Texas Project (STP) PSA are used to quantify the magnitude of changes in initiating event frequencies. Issues associated with interpreting the results of risk monitors are discussed.

Issue Section:
Research Papers
Topics:
Probabilistic safety assessment, Risk, Risk monitoring
1.
Fleming, K. N., et al., 1997, Risk and Reliability Impacts of Balance of Plant Equipment at STPEGS, prepared by ERIN Engineering and Research, Inc. for Houston Lighting and Power Co.
2.
Fleming, K. N., and Loh, W. T., 1993, Risk Impact of Maintenance Configurations at South Texas Electric Generating Plant, PLG-0917, prepared by PLG, Inc. for Houston Lighting and Power Co.
3.
Hook, T. G., 1996, Risk Impact of Switchyard Maintenance Through Use of the Safety Monitor, PSA ’96, International Topical Meeting on Probabilistic Safety Assessment, Park City, UT, Vol. I, pp. 3–8.
4.
True, D. E., et al., 1995, PSA Applications Guide, prepared by ERIN Engineering and Research, Inc. for Electric Power Research Institute, EPRI Report No. TR-105396.
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 by The American Society of Mechanical Engineers
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