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The control rod system is the main reactivity control system of the high temperature gas-cooled reactor, which performs reactivity control and emergency shutdown control under various operating modes of the reactor. As the main equipment to drive the control rod, the control rod drive mechanism (CRDM) plays the role of the actuator. Different from the PWR, the control rod system used in the high temperature gas-cooled reactor (HTR) works under high temperature helium, which puts forward higher requirements for the insulation of the CRDM. The CRDM with ring chain structure was used in some HTR. Due to the manufacturing process of high temperature alloy ring chain and the limitation of high temperature motor development technology, the control rod drive mechanism is more complicated, which affects the reliability of the system. In order to further optimize the CRDM of the HTR, this research proposes a new structure of the CRDM. With the cooperation of planetary roller screw, high temperature shielding motor and new transmission rope wheel, the system becomes simpler, more efficient, and has a longer lifespan, which brings a more reliable drive scheme for the CRDM of the HTR.

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Research of New Control Rod Drive Mechanism for High Temperature Gas-Cooled Reactor

  • 会议论文

  • 发表日期：

    2026年

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  • Ping Liu,
  • Wei Wang,
  • Dongwang Meng,
  • Weijun Lei,
  • Lin Ye,
  • Jie Xu,
  • Zhang Shichun,
  • Wang Qi,
  • Qiangqiang Yang,
  • Huimin Sun

摘要

The control rod system is the main reactivity control system of the high temperature gas-cooled reactor, which performs reactivity control and emergency shutdown control under various operating modes of the reactor. As the main equipment to drive the control rod, the control rod drive mechanism (CRDM) plays the role of the actuator. Different from the PWR, the control rod system used in the high temperature gas-cooled reactor (HTR) works under high temperature helium, which puts forward higher requirements for the insulation of the CRDM. The CRDM with ring chain structure was used in some HTR. Due to the manufacturing process of high temperature alloy ring chain and the limitation of high temperature motor development technology, the control rod drive mechanism is more complicated, which affects the reliability of the system. In order to further optimize the CRDM of the HTR, this research proposes a new structure of the CRDM. With the cooperation of planetary roller screw, high temperature shielding motor and new transmission rope wheel, the system becomes simpler, more efficient, and has a longer lifespan, which brings a more reliable drive scheme for the CRDM of the HTR.