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The emergency boron injection system mainly deals with accidents beyond the design criteria such as ATWS, achieve core boronization and ensures the subcritical state of the core. The emergency boron injection tank is an important safety level equipment to provide concentrated boron solution for system. In order to prevent boric acid crystallization, an electric heater is provided in the boron injection tank. When the external temperature is too low, the electric heater is started to ensure that the boric acid solution in the tank will not crystallize. In the design of HPR1000, the emergency boron injection tank uses a wall-mounted electric heater, which is arranged on the outer wall of the box. According to the power plant operator feedback, after electric heater operating a few days, when starts to mix the boric acid in the box, the temperature of the boric acid continues to rise and has a tendency to break the high temperature alarm value in half an hour, but there has no temperature alarm before. The temperature instrument cannot reflect the real situation in the box and the control of the electric heater cannot achieve the design requirements. In addition, high temperature of boron injection tank will increase the risk of cavitation of downstream boron injection pump. After the on-site operation, instrument problems and other causes of the investigation, the preliminary analysis of the cause of this problem mainly lies in the box volume is too large, after the electric heater heating a long time, the fluid in the box has a serious thermal stratification, suddenly mixing boric acid caused the fluid temperature rises rapidly. In order to solve the above problems, this paper intends to study the heating process of the emergency boron injection box by CFD numerical simulation. Through analysis of the temperature field and flow field of the fluid in the boron injection box during the heating process, the causes of thermal stratification and solutions are determined, and several different types and arrangements of electric heaters are proposed, and the optimal design scheme of the emergency boron injection box is given.

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Analysis of Emergency Boron Injection Tank Thermal Stratification and Design Optimization of the Equipment

  • 会议论文

  • 发表日期：

    2026年

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  • Ting Hou,
  • Yijun Yao,
  • Mengji Zhang,
  • Huiyun Ma,
  • Yanlin Chen

摘要

The emergency boron injection system mainly deals with accidents beyond the design criteria such as ATWS, achieve core boronization and ensures the subcritical state of the core. The emergency boron injection tank is an important safety level equipment to provide concentrated boron solution for system. In order to prevent boric acid crystallization, an electric heater is provided in the boron injection tank. When the external temperature is too low, the electric heater is started to ensure that the boric acid solution in the tank will not crystallize. In the design of HPR1000, the emergency boron injection tank uses a wall-mounted electric heater, which is arranged on the outer wall of the box. According to the power plant operator feedback, after electric heater operating a few days, when starts to mix the boric acid in the box, the temperature of the boric acid continues to rise and has a tendency to break the high temperature alarm value in half an hour, but there has no temperature alarm before. The temperature instrument cannot reflect the real situation in the box and the control of the electric heater cannot achieve the design requirements. In addition, high temperature of boron injection tank will increase the risk of cavitation of downstream boron injection pump. After the on-site operation, instrument problems and other causes of the investigation, the preliminary analysis of the cause of this problem mainly lies in the box volume is too large, after the electric heater heating a long time, the fluid in the box has a serious thermal stratification, suddenly mixing boric acid caused the fluid temperature rises rapidly. In order to solve the above problems, this paper intends to study the heating process of the emergency boron injection box by CFD numerical simulation. Through analysis of the temperature field and flow field of the fluid in the boron injection box during the heating process, the causes of thermal stratification and solutions are determined, and several different types and arrangements of electric heaters are proposed, and the optimal design scheme of the emergency boron injection box is given.