System Study: Residual Heat Removal 1998-2014

Schroeder, John Alton¹ 

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

关键词: RELIABILITY;    RHR SYSTEMS;    LOSS OF COOLANT;    AFTER-HEAT REMOVAL;    NUCLEAR POWER PLANTS;    PRESSURE RANGE KILO PA;    PRESSURE RANGE MEGA PA 01-10;    REACTOR SHUTDOWN;    DEMAND;    EVALUATION;    FAILURES;   

DOI  :  10.2172/1260456
RP-ID  :  INL/EXT--16-37934
PID  :  OSTI ID: 1260456
Others  :  TRN: US1601551

美国|英语

来源: SciTech Connect

【 摘 要 】

This report presents an unreliability evaluation of the residual heat removal (RHR) system in two modes of operation (low-pressure injection in response to a large loss-of-coolant accident and post-trip shutdown-cooling) at 104 U.S. commercial nuclear power plants. Demand, run hours, and failure data from fiscal year 1998 through 2014 for selected components were obtained from the Institute of Nuclear Power Operations (INPO) Consolidated Events Database (ICES). 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 trends were identified in the RHR results. A highly statistically significant decreasing trend was observed for the RHR injection mode start-only unreliability. Statistically significant decreasing trends were observed for RHR shutdown cooling mode start-only unreliability and RHR shutdown cooling model 24-hour unreliability.