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NUREG/CR-6928 INL/EXT-06-11119 Idaho National Laboratory U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Washington, DC 20555-0001 Prepared by: S.A. Eide, T.E. Wierman, C.D. Gentillon, D.M. Rasmuson, C.L. Atwood NRC Job Code Y6546 2007 This report characterizes current industry-average performance for components and initiating events at U.S. commercial nuclear power plants. Studies have indicated that industry performance has improved since the 1980s and early 1990s, so the characterization of current industry-average performance is an important step in maintaining up-to-date risk models. Four types of events are covered: component unreliability (e.g., pump fail to start or fail to run), component or train unavailability resulting from test or maintenance outages, special event probabilities covering operational issues (e.g., pump restarts and injection valve re-openings during unplanned demands), and initiating event frequencies. Typically data for 1998–2002 were used to characterize current industry-average performance, although many initiating events required longer periods (ending in 2002) to adequately characterize frequencies. Results (beta distrib

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Language

EN

Category

nonfiction

Subjects

Technology, Energy, Stem