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Under the accident conditions of station blackout, earthquake, and loss of coolant, the decay heat removal system is an important system to ensure the core decay heat removal. It’s of great significance to study the characteristics of a decay heat removal system for evaluating its heat removal capacity. In this paper, deionized water is used as working fluid, and the transient process of natural circulation of the decay heat removal system with heat exchanger penetrating cold pool and hot pool under accident conditions is studied. The results show that the temperature and flow field in the system change with the natural circulation from normal operation to transient operation. The important parameters such as temperature, flow distribution, and flow path during normal operation and natural circulation are obtained. This study can provide important support for designing and analyzing decay heat removal systems in fast reactors.

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Experimental Study on Natural Circulation Characteristics of Decay Heat Removal of Penetrating Decay Heat Exchanger in Pool-Type Fast Reactor

  • 会议论文

  • 发表日期：

    2026年

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  • Weilong Gao,
  • Daoxi Cheng,
  • Mingdi Xing,
  • Shicheng Fan,
  • Weiming Zhai,
  • Ping Zhou,
  • Song Yu,
  • Xiaoyao Ma,
  • Ruizhi Li

摘要

Under the accident conditions of station blackout, earthquake, and loss of coolant, the decay heat removal system is an important system to ensure the core decay heat removal. It’s of great significance to study the characteristics of a decay heat removal system for evaluating its heat removal capacity. In this paper, deionized water is used as working fluid, and the transient process of natural circulation of the decay heat removal system with heat exchanger penetrating cold pool and hot pool under accident conditions is studied. The results show that the temperature and flow field in the system change with the natural circulation from normal operation to transient operation. The important parameters such as temperature, flow distribution, and flow path during normal operation and natural circulation are obtained. This study can provide important support for designing and analyzing decay heat removal systems in fast reactors.