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In recent years, the development of Small Modular Reactors (SMRs) has attracted significant attention. Due to their smaller size, the temperature and pressure rise caused by small break loss of coolant accidents (SBLOCA) pose a greater threat to the containment than in large-scale reactors. Therefore, to achieve rapid cooling of the steam ejected from the break and suppress the increase in temperature and pressure within the containment, an air-cooled containment was designed. This paper simulates the thermal response of a double-layer containment under SBLOCA conditions. Taking ACP100 as an example, a comprehensive study of the calculation model for small modular reactors was conducted. On this basis, the grid layout, initial conditions, and boundary conditions of the double-layer containment for small modular reactors were investigated. Through simulation testing of the containment pressure and temperature response under accident conditions, and comparison with the calculation results of the reference program GOTHIC, this study provides an important reference for revising and supplementing the containment model of small modular reactors.

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Simulation on Thermal–Hydraulic Characteristics Inside a Pressurized-Containment Under Steam Release Conditions Containing Non-condensable Gases

  • 会议论文

  • 发表日期：

    2026年

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  • Li Anchi,
  • Xu Jibin,
  • Yang Yu,
  • Zhang Yuhao,
  • Lu Daogang

摘要

In recent years, the development of Small Modular Reactors (SMRs) has attracted significant attention. Due to their smaller size, the temperature and pressure rise caused by small break loss of coolant accidents (SBLOCA) pose a greater threat to the containment than in large-scale reactors. Therefore, to achieve rapid cooling of the steam ejected from the break and suppress the increase in temperature and pressure within the containment, an air-cooled containment was designed. This paper simulates the thermal response of a double-layer containment under SBLOCA conditions. Taking ACP100 as an example, a comprehensive study of the calculation model for small modular reactors was conducted. On this basis, the grid layout, initial conditions, and boundary conditions of the double-layer containment for small modular reactors were investigated. Through simulation testing of the containment pressure and temperature response under accident conditions, and comparison with the calculation results of the reference program GOTHIC, this study provides an important reference for revising and supplementing the containment model of small modular reactors.