Presentation Information
[2G08]Development of Technologies for Containing, Transportation and Storage of Fuel Debris(6) Consideration of Viscosity Development in Water Suspensions of Oxide Powders
*Ryuji Nagaishi1, Atsuhiko Terada1, Tatsuya Ito1, Thwe Thwe Aung1 (1. JAEA)
Keywords:
Oxide Powder,Water Suspension,Viscosity Property,Electrostatic Charge,Water Molecule Adsorption
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. Using oxides of ceria and zirconia as debris simulants, experiments on H2 generation accompanying radiolysis of water in suspensions of the powders are being carried out. This water suspension has a higher viscosity than pure water, and may become a slurry in which the oxide powder is dispersed in the water without settling. The viscosity of this suspension depends on the particle size of oxide powder and its concentration in the water, but is not determined solely by these. Understanding the mechanism of this viscosity development is important in evaluating and predicting H2 bubbles (H2pools) retained in the suspension. In this study, we discussed the effects of the charge (pH dependence) and the adsorption of water molecules on the oxide surface on the viscosity properties of the suspension, based on the data from physical property analysis and irradiation experiments.