Network Reliability Analysis of Digital Instrument and Control System with GO-FLOW Methodology

In this paper, the network reliability of an actual digital instrument and control system （DICS） network is analyzed by using GO-FLOW methodology （GFM）. The evaluations of common-cause failure （CCF） and uncertainty are incorporated. Three significant CCF groups （real time servers, gateways, reactor protection system） and three typical time intervals （10 min, 1 h, and 24 h） are selected in the analysis. It is concluded that the network contribution of CCF accounts for over 68% of the system failure probability. The result indicates that GFM is suitable for the network reliability analysis.