A study on terminal velocity for scatter prevention of powders in a voloxidizer for a hot cell demonstration

摘要

A voloxidizer for hot cell demonstrations that handles spent fuel of high radiation virulence in a limited space should have a small size and not scatter in its outlet. This study predicts the terminal velocity of U_3O_8 by using the terminal velocity of SiO_2, which would determine the optimum air flux. We obtained a theory terminal velocity of SiO_2 and conducted an experiment for verification. In a relative form of density ratio vs. particle size, and a theory slop ratio of SiO_2, U_3O_8, we predict the terminal velocity and flux of U_3O_8. And through an oxidation experiment, we verify the theory form to detect the existence of U_3O_8 powder in a discharge filter. We have conducted a scattering experimentation of U_3O_8 powder using an existing experimental oxidizer in a mock-up. The optimum flow and experimental results of U_3O_8 for scatter prevention have been applied for the design of the demonstration oxidizer, and the operation conditions of the oxidizer were produced.