Preliminary Study on Reliability Analysis of Safety I&C System in NPP
Digital instrumentation and control (I&C) systems, such as digital Reactor Protection System (RPS), are being employed gradually at newly-built and upgraded Nuclear Power Plants (NPPs). The reliability analysis of digital I&C system turns to be a research focus. This paper proposes a preliminary study on reliability analysis for the digital RPS of High Temperature Gas-Cooled Reactor-Pebble bed Module (HTR-PM). We first introduce the function and structure of RPS in HTR-PM; then the processes of failure mode and effect analysis (FMEA) at system level are given; finally we present the FMEA of a computer device as an example and introduce the future work. This study analyses all possible safety-relevant implications arising from failures in RPS and promotes the reliability analysis of the digital RPS in HTR-PM.
Keywordsnuclear power plant digital reactor protection system reliability failure mode and effect analysis
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