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In severe nuclear power plant accidents, molten core materials accumulate in the lower head of the reactor pressure vessel, forming a complex molten pool structure. The stratification behavior of the molten pool significantly influences its heat transfer characteristics and the pressure vessel’s integrity. This study combines the NUCLEA-15 thermodynamic database with a self-developed molar volume database, integrating lumped parameter models to analyze the phase stratification and heat transfer behavior of a molten pool system primarily composed of uranium (U), oxygen (O), zirconium (Zr), iron (Fe), chromium (Cr), and nickel (Ni). Using the mass parameters of the DOE/ID-10460 Benchmark IVR case as initial conditions, the heat transfer in the molten pool was calculated by combining the Thermo-Calc thermodynamic calculation method. This work provides theoretical insights into molten pool behavior and offers a strategy for optimizing IVR strategies during severe accidents.

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A Temperature Coupling Framework for Thermohydraulic Analysis of Stratified Molten Pool Configuration

  • 会议论文

  • 发表日期：

    2026年

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  • Pengya Guo,
  • Erhui Chen,
  • Peng Yu,
  • Li Zhang,
  • Zhuo Liu,
  • Wei Li,
  • Jiyang Yu,
  • Yidan Yuan

摘要

In severe nuclear power plant accidents, molten core materials accumulate in the lower head of the reactor pressure vessel, forming a complex molten pool structure. The stratification behavior of the molten pool significantly influences its heat transfer characteristics and the pressure vessel’s integrity. This study combines the NUCLEA-15 thermodynamic database with a self-developed molar volume database, integrating lumped parameter models to analyze the phase stratification and heat transfer behavior of a molten pool system primarily composed of uranium (U), oxygen (O), zirconium (Zr), iron (Fe), chromium (Cr), and nickel (Ni). Using the mass parameters of the DOE/ID-10460 Benchmark IVR case as initial conditions, the heat transfer in the molten pool was calculated by combining the Thermo-Calc thermodynamic calculation method. This work provides theoretical insights into molten pool behavior and offers a strategy for optimizing IVR strategies during severe accidents.