Design and Implementation of Security Audit System for Nuclear Safety-Class DCS

The nuclear safety-class distributed control system(DCS) constitutes a critical component of DCS in nuclear power plants, playing a crucial role in ensuring the safe and stable operation of reactors. This paper presents an analysis of the structural and behavioral characteristics of nuclear safety-class DCS and proposes the design and implementation of a security audit system, including functional requirements, audit strategies, audit rules. The system facilitates data collection, audit objects, audit rules and strategies, integrating rules for database protocols, industrial control protocols and network protocols to establish a comprehensive audit activity flow. The system has been applicated in a nuclear power plant and effective result has been obtained.