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The communication reliability between safety-class distributed control system (1E-DCS) and non-safety-class distributed control system (NC-DCS) is crucial for the safe operation of nuclear power plants. This paper investigates the communication redundancy issues between 1E-DCS and NC-DCS in the context of domestically developed DCS systems and proposes a communication design based on a 1:1 redundant architecture. By analyzing data classification, communication protocols, and equipment characteristics between safety-class and non-safety-class systems, three redundant communication solutions are designed, with a focus on the optimized design of solution III. This solution introduces a gateway (GW) to achieve data distribution and heterogeneous network optimization. Combined with Modbus/TCP protocol reconstruction, dynamic packet transmission mechanisms, and global quality bit determination strategies, it significantly improves system real-time performance and switching capabilities. Theoretical calculations demonstrate that the redundant design enhances communication link reliability. Experimental tests verify the effectiveness of the solution in basic communication functions, redundancy switching, and fault alarms, providing technical references for DCS communication redundancy design in nuclear power plants.

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Redundant Communication Design Between Safety-Class and Non-Safety-Class DCS in Nuclear Power Plants

  • 会议论文

  • 发表日期：

    2025年

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  • Ma Yu,
  • Han Wenxin,
  • Li Jueying,
  • Yao Zhang,
  • Yuan Yannan,
  • Zhang Jiawei

摘要

The communication reliability between safety-class distributed control system (1E-DCS) and non-safety-class distributed control system (NC-DCS) is crucial for the safe operation of nuclear power plants. This paper investigates the communication redundancy issues between 1E-DCS and NC-DCS in the context of domestically developed DCS systems and proposes a communication design based on a 1:1 redundant architecture. By analyzing data classification, communication protocols, and equipment characteristics between safety-class and non-safety-class systems, three redundant communication solutions are designed, with a focus on the optimized design of solution III. This solution introduces a gateway (GW) to achieve data distribution and heterogeneous network optimization. Combined with Modbus/TCP protocol reconstruction, dynamic packet transmission mechanisms, and global quality bit determination strategies, it significantly improves system real-time performance and switching capabilities. Theoretical calculations demonstrate that the redundant design enhances communication link reliability. Experimental tests verify the effectiveness of the solution in basic communication functions, redundancy switching, and fault alarms, providing technical references for DCS communication redundancy design in nuclear power plants.