Development of combined algorithm of on-line instrument failure detection with improved GLR method and suboptimal control on PWR pressurizer

Abstract

In nuclear power plant, instrument failures must be detected and compensated for before a significant decrease in plant performance occurs. In this paper, the improved GLR method to detect and identify a failure and control algorithm in case of instrument failure are developed. The failure detection algorithm and the control algorithm are combined and applied to PWR pressurizer. The computer simulation tests show that on-line prompt failure detection and compensation through control action can be performed very successfully even when there is an instrument failure.