Presentation Information
[2G07]Development of Technologies for Containing, Transportation and Storage of Fuel Debris(5) Numerical Analysis of Temporal Structural Changes of Oxide Powder inside Water Suspension
*Atsuhiko Terada1, Ryuji Nagaishi1, Thwe Thwe Aung1, Tatsuya Ito1 (1. JAEA)
Keywords:
Oxide Powder,Water Suspension,Computational Fluid Dynamics (CFD) Analysis,Sedimentation,Structural Change
In the “Development of Technologies for Containing, Transportation and Storage of Fuel Debris”, efforts have been made to develop methods for evaluating the amount of hydrogen (H2) generated from lump-shaped debris, and we are now developing methods for powdered debris. As a new attempt, we started computational fluid dynamics (CFD) analysis to visually capture the state of powdered debris over time, such as “movement” and “changes” in a mixture of powdered debris and water. As this “movement” or “change”, we are currently conducting numerical analysis of two-phase systems, focusing on the growth and behavior of H2 bubbles in viscoelastic fluids (liquid and gas phases), as well as the structural changes (im-homogenization) over time within the mixture (liquid and solid phases) in relation to H2 bubbles (H2 pools) that are predicted to be generated during the radiolysis of water and retained in the mixture. In this report, oxides such as ceria and zirconia were used as debris simulants, and we will introduce the results of an analysis of the time-dependent im-homogenization of oxide powder inside water suspensions, as well as future challenges and developments.