Study on Operator Reliability of Digital Control System in Nuclear Power Plants Based on Boolean Network

The current human reliability analysis method of analyzing system operator’s reliability, carried out from the perspective of operators themselves, is relatively static, for it hasn’t taken the effect of system evolution on the operators’ performance into consideration. In view of operator reliability in digital control system in nuclear power plant, this paper, based on boolean network theory, tries to explore the operators’ behavior in the dynamic logic process of system evolution, aiming at finding out the dynamic evolution process of human-system interaction. A new technique, called the semi-tensor product of matrices, can convert the logical systems into standard discrete-time dynamic systems, and then the discrete-time linear equation and reliability analysis model are established. Data collected from simulation experiments carried out in full-size simulator in LingDong Nuclear Power Plant is found to be in consistence with the operator reliability model constructed before.