This report documents the quantitative results of the current industryaverage performance for components and initiating events (IEs) at U.S. commercial nuclear power plants (NPPs). It represents the third update of the original analysis in NUREG/CR-6928 with data through 2020. Continuous characterization and updating of current industry-average performance with the latest industry data available are important steps in maintaining up-to-date risk models.
This paper summarizes key insights from studies of common-cause failures (CCFs) of emergency diesel generators, motor-operated valves, motor-driven pumps, and circuit breakers from 1980 to 2005. The data studied were derived from the Nuclear Regulatory Commission's CCF database, which is based on US commercial nuclear power plant event data. The insights are the result of an in-depth review of the CCF data. Trends of the annual number of CCF events show that the number of events has been decreasing over time. The insights can help to focus inspection and utility maintenance activities.
This information was prepared as an account of work sponsored by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for any third party's use, or the results of such use, of any information, apparatus, product, or process disclosed herein, or represents that its use by such third party would not infringe privately owned rights. The views expressed herein are not necessarily those of the U.S. Nuclear Regulatory Commission.
This report presents an unreliability evaluation of the high-pressure core spray (HPCS) at 8 U.S. commercial boiling water reactors. Demand, run hours, and failure data from fiscal year 1998 through 2012 for selected components were obtained from the Equipment Performance and Information Exchange (EPIX). The unreliability results are trended for the most recent 10-year period while yearly estimates for system unreliability are provided for the entire active period. No statistically significant increasing or decreasing trends were identified in the HPCS results.
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