[1H11-13] Adosorption on Soil, Analytical Technique

[1H13] Development of ultramicro analysis technology for fuel debris analysis

(17) Comparison of the powderization effect of non-equilibrium plasma oxidation and thermochemical oxidation powders of uranium dioxide solids for actinide analysis

*ZhuoRan Ma¹, Takaharu Tatsuno¹, Yoshiya Homma², Kenji Konashi², Tatsuya Suzuki¹ (1. Nagaoka Univ. of Tech., 2. Tohoku Univ.)

Keywords:nuclear fuel debris, non-equilibrium plasma oxidation, voloxidation

In order to facilitate the dissolution of these insoluble nuclear debris from the Fukushima accident, it is necessary to investigate methods of pulverizing them to increase their surface area. We therefore developed non-equilibrium plasma oxidation device to verify the powderization of uranium dioxide solids and to compare the results with thermochemical oxidation. For the results of the plasma oxidation experiment, Uranium dioxide solid (42mg) can be partly converted to powder by plasma oxidation (6.5h, O₂:0.4 L/min) with a low temperature (less than 200℃). Small uneven bumps of 1µm or less appears on the surface of powders produced by oxidation using non-equilibrium plasma.