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Influence of an in-vessel debris bed on the heat load to a reactor vessel under an IVR condition

박해균|정범진|박준수
한국원자력학회 (Korean Nuclear Society)|2023.01|Nuclear Engineering and Technology|제55권 제1호|pp. 180-189|DOI 10.1016/j.net.2022.09.023

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키워드

AnalogySevere accidentIn-vessel retentionIn-vessel debris bedOxide pool
주제분류원자력공학

초록

We measured the heat load to a reactor vessel with and without the in-vessel debris bed under an IVRERVC condition. Mass transfer methodology was adopted based on heat and mass transfer analogy to achieve high Ra0 H of order ~1015 with compact test rigs. We postulated the in-vessel debris bed has a flat top and particulate debris was simulated as an identical diameter spheres. We conducted experiments varying the height of the debris bed and the results showed that Nusselt numbers decreased in both uppermost and curved surfaces with the increasing bed height. Once the debris bed is formed, it acts as an obstacle to the natural convective flow, which reduces the buoyancy. The reduction of driving force results in the impaired heat transfer in both upward and downward heat transfers

Abstract

We measured the heat load to a reactor vessel with and without the in-vessel debris bed under an IVRERVC condition. Mass transfer methodology was adopted based on heat and mass transfer analogy to achieve high Ra0 H of order ~1015 with compact test rigs. We postulated the in-vessel debris bed has a flat top and particulate debris was simulated as an identical diameter spheres. We conducted experiments varying the height of the debris bed and the results showed that Nusselt numbers decreased in both uppermost and curved surfaces with the increasing bed height. Once the debris bed is formed, it acts as an obstacle to the natural convective flow, which reduces the buoyancy. The reduction of driving force results in the impaired heat transfer in both upward and downward heat transfers

참고문헌 (39)

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