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The HPR1000 nuclear power technology employs a tube bundle-type Passive Containment Cooling System (PCCS) for post-accident heat removal. This study investigates aerosol deposition mechanisms under severe accident conditions, where steam condensation on PCCS heat exchanger tubes induces thermophoretic and diffusiophoretic deposition alongside inherent gravitational settling and Brownian diffusion. Experimental investigations were conducted in a 12.5 m3 containment vessel using TiO₂ and SiO₂ aerosols under varying thermal–hydraulic conditions. The SPRUCE code developed by CNPRI was validated against experimental data, demonstrating that: (1) A dynamic shape factor χ = 2 is required for non-spherical TiO₂ aerosols in dry air, while χ = 1 suffices in saturated steam environments due to condensation-induced sphericity; (2) The implemented thermophoresis model shows maximum error less than 5% when the gas-tube temperature difference is within (58–75 K); (3) Discrepancies emerge at high condensation rates (>3.69 g/s) due to unmodeled turbulent deposition and heterogeneous nucleation effects. These findings provide critical validation for severe accident analysis tools and inform PCCS design optimization.

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Validation of SPRUCE Code with Aerosol Deposition Experiment in a Containment with Heat Exchanger Tubes

  • 会议论文

  • 发表日期：

    2026年

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  • Chen Yongzheng,
  • Ouyang Yong,
  • Ou Pingwen,
  • Liao Feiye,
  • E. Xinnuo,
  • Chen Peng,
  • Guo Chao,
  • Gu Haifeng

摘要

The HPR1000 nuclear power technology employs a tube bundle-type Passive Containment Cooling System (PCCS) for post-accident heat removal. This study investigates aerosol deposition mechanisms under severe accident conditions, where steam condensation on PCCS heat exchanger tubes induces thermophoretic and diffusiophoretic deposition alongside inherent gravitational settling and Brownian diffusion. Experimental investigations were conducted in a 12.5 m3 containment vessel using TiO₂ and SiO₂ aerosols under varying thermal–hydraulic conditions. The SPRUCE code developed by CNPRI was validated against experimental data, demonstrating that: (1) A dynamic shape factor χ = 2 is required for non-spherical TiO₂ aerosols in dry air, while χ = 1 suffices in saturated steam environments due to condensation-induced sphericity; (2) The implemented thermophoresis model shows maximum error less than 5% when the gas-tube temperature difference is within (58–75 K); (3) Discrepancies emerge at high condensation rates (>3.69 g/s) due to unmodeled turbulent deposition and heterogeneous nucleation effects. These findings provide critical validation for severe accident analysis tools and inform PCCS design optimization.