Reliability Assessment of Safety-Critical Network Communication in a Digitalized Nuclear Power Plant

摘要

In this study, a framework for identifying the potential hazardous states of network communication in the ESF-CCS was proposed. In addition, a fault-tree model for network communication failure was developed to estimate the risk effects of network failure between the GCs and LCs on ESF-CCS signal failure. The developed fault-tree model was then applied to several case studies. The fault-tree model of ESF-CCS signal failure for ESF components required for various mitigation actions regarding NPP DBAs was designed by considering the identified hazardous states of network failure that would result in a failure to provide input signals to the corresponding LC.