Enhanced Component Performance Study: Air-Operated Valves 1998-2014

Schroeder, John Alton¹ 

[1] Idaho National Lab. (INL), Idaho Falls, ID (United States)

关键词: VALVES;    AIR;    FAILURES;    NUCLEAR POWER PLANTS;    RELIABILITY;    DEMAND;    PERFORMANCE;    CONTROL;    EVALUATION;    OPERATION;    FLUCTUATIONS;   

DOI  :  10.2172/1260457
RP-ID  :  INL/EXT--16-37935
PID  :  OSTI ID: 1260457
Others  :  TRN: US1601552

美国|英语

来源: SciTech Connect

【 摘 要 】

This report presents a performance evaluation of air-operated valves (AOVs) at U.S. commercial nuclear power plants. The data used in this study are based on the operating experience failure reports from fiscal year 1998 through 2014 for the component reliability as reported in the Institute of Nuclear Power Operations (INPO) Consolidated Events Database (ICES). The AOV failure modes considered are failure-to-open/close, failure to operate or control, and spurious operation. The component reliability estimates and the reliability data are trended for the most recent 10-year period, while yearly estimates for reliability are provided for the entire active period. One statistically significant trend was observed in the AOV data: The frequency of demands per reactor year for valves recording the fail-to-open or fail-to-close failure modes, for high-demand valves (those with greater than twenty demands per year), was found to be decreasing. The decrease was about three percent over the ten year period trended.