Research on Decoupling and Isolation Design of Nuclear Safety-Class DCS

In Nuclear Safety-class Distributed Control Systems (DCS), isolation refers to the measures used to eliminate or reduce the adverse interaction between systems of different safety-class and redundant subsystems of the same safety-class, including physical separation, electrical isolation, and communication isolation. In order to ensure the independence of the Nuclear Safety-Class DCS system electrical equipment and circuits, isolation measures shall be taken for the design of isolation so that the Nuclear Safety-Class DCS electrical equipment and electrical circuits can perform the required safety functions during and after any design basis event. According to the relevant regulations and standards of Nuclear Safety-class DCS isolation, the design requirements of electrical and circuit isolation are obtained, and the typical architectures of three isolation forms are designed. Based on this design, Nuclear Safety-class DCS can meet the requirements of independence and safety and improve the reliability of the system.