Digital Design and Reliability Analysis for Qinshan Phase-I Reactor Power Control System

A novel control strategy based on the redundancies of CPU,power supply and ControlNet field-bus is proposed to solve the problems of equipment aging,maintenance and reliability of Qinshan Phase-I 300MW reactor power analog instrumentation and control(IC) system.Digital design based on PLC control technology is used to replace its rod control and position indication so that the limitations of being unable to adjust the system parameters online and poor anti-interference capability can be avoided and the system communication,central monitoring,maintainability,reliability and security can be improved.The modular program design can strengthen the readability and practicability,shorten the scanning time and speed the response.The feasibility and rationality of the design have been proved in a practical reactor operation.Finally,the author briefly introduces some feasible ways to enhance the reliability of the reactor digital control system.