Dissolution of ThO2-Based Oxides in Nitric Acid Solutions at Elevated Temperatures.

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概要

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• Highly-dense spherical particles of thorium-based oxides, ThO<SUB>2</SUB> and (Th, U)O<SUB>2</SUB>, prepared by the sol-gel method were subjected to dissolution with nitric acid containing 00.05 mol/l NaF at high temperatures above 120°C. The dissolution rate depended upon temperature, fluoride concentration and UO<SUB>2</SUB> content. High-temperature in the range of 120200°C enhanced the dissolution of the ThO<SUB>2</SUB>-based fuels. At low temperatures and/or low UO<SUB>2</SUB> concentrations, insoluble tetrafluoride precipitates were formed on the particle surfaces and they resulted in the decrease of the dissolution rates. In the present study, the apparent activation energies for the high-temperature dissolution were obtained.

• 一般社団法人 日本原子力学会の論文

著者

• AKABORI Mitsuo

  Department of Fuels and Materials Research, Japan Atomic Energy Research Institute

• SHIRATORI Tetsuo

  Department of Fuels and Materials Research, Japan Atomic Energy Research Institute

関連論文

• Dissolution of ThO2-Based Oxides in Nitric Acid Solutions at Elevated Temperatures.

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