[3D01-04] Corrosion Chemistry and FP Behavior 1

[3D01] Studies on Radiation Effects on High-viscous Fluids of Co-precipitate and Clay Systems

*Ryuji Nagaishi¹, Ryo Kuwano¹ (1. JAEA)

Keywords:High-viscous Fluid, Radiolysis, Material Degradation, Hydrogen Molecule, Viscosity

The overflow from HIC at ALPS was owing to water radiolysis of beta rays in co-precipitate slurry of carbonate, leading to the volume increase of slurry and supernatant formation. The radiation effects (radiolysis and material degradation) on high-viscous fluids after long-term (high dose) irradiation is quite different from those on low-viscous fluids such as aqueous solutions. The understanding of effects on high-viscous fluids, containing suspension of clay which is planned to be used as a buffer material for final disposal, is important in long-term storage and disposal of radioactive wastes. In this study, the physical and viscosity properties of fluids of co-precipitate and clay systems were measured before and after irradiation of electron beam and gamma ray to discuss the relations among their properties quantitatively.