Abstract
We investigated the characteristics of reactivity change due to fuel debris falling into water. The impact of each parameter on criticality was evaluated using a basic parametric survey. The results clearly indicated that when a large number of fuel debris pieces suddenly sediment in water, the reactivity increases rapidly. It suggested that this situation must be avoided to prevent criticality accidents during fuel debris retrieval operations. On the other hand, when fuel debris pieces gradually sediment, falling from a low height onto a floor with high friction, the sedimentation shape can easily condense to a significant height. In such cases, the criticality risk might become large once the sedimentation process is complete. Our findings indicate that this situation should also be avoided.
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