Measurement of the Heat Load Imposed on the Reactor Vessel Depending on the Debris Bed Under an IVR Condition

In a severe accident condition, particulate debris generated by thermal shock and the dense debris may remain at the bottom of the oxide pool without completely melting after the relocation process of the molten corium [1–4]. Then, the debris bed formed and the geometrical condition of the oxide pool was changed, which may affect natural convection heat transfer of the oxide pool. However, only a few studies [1, 3] were performed regarding the in-vessel debris bed. We measured the variations of local heat flux distribution and comparative analyses were performed between with and without debris bed conditions with a few different bed heights.

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