Abstract
This study evaluates how multi-phase fluids flow and how a large volume becomes a dryout region in a volumetrically heat-generating conical porous bed formed in the pre-flooded reactor cavity of a hypothetical 1,000 MWe-class NPP whose reactor cavity is circular and 9 m in diameter. At repose angles of 25°, 35°, and 45°, effective particle diameters of 0.65, 0.9 and 1.65 mm with porosity of 0.37, the system pressures from 1 bar to 5 bar and the power densities of 400, 600, and 800 kW/m3, the coolability of debris beds is assessed. It is observed that dryout occurs in the debris beds for all the analyzed cases and that the volumetric ratio of dryout region is from 1.6% to 90.4%. The evaluation finds that the dryout region decreases as the effective particle diameter increases, the system pressure increases, the repose angle increases and the power density decreases.
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