Solubility of simulated high-level radioactive wastes in CaO-stabilized zirconia.

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概要

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• The reaction between simulated high-level radioactive wastes (HLW) and CaO-stabilized zirconia with CaF<SUB>2</SUB> structure has been studied in the temperature range of 8001, 500 °C in air and in a mixture of 4%H<SUB>2</SUB>+96%He. Under the heat treatment in air at temperatures between 1, 000 and 1, 400 °C, 4W/O simulated HLW was dissolved in the CaF<SUB>2</SUB> phase. The lattice parameter of the CaF<SUB>2</SUB> lattice increased with HLW content according to the equation a= 0.5134+0.00028x nm, where x is the HLW content in W/O. In the region of 420W/O HLW, two phases were present : the CaF<SUB>2</SUB> and scheelite type phases. The actinide and rare earth elements were dissolved in the CaF<SUB>2</SUB> lattice, of which lattice parameter varied with HLW content in the form a=0.5141+0.00014x nm. Under the heat treatment in a mixture of 4%H<SUB>2</SUB>+96%He, three phases were formed in the sample containing the HLW. They were the CaF<SUB>2</SUB> phase, (Sr, Ca) ZrO<SUB>3</SUB> with orthorhombic structure and Mo metal. The actinide and rare earth elements were fixed in the CaF<SUB>2</SUB> lattice. The increase of the lattice parameter of the CaF<SUB>2</SUB> lattice was given by the expression a=0.5134+0.00022x nm.

• 一般社団法人 日本原子力学会の論文

著者

• HINATSU Yukio

  Department of Chemistry, Tokai Establishment, Japan Atomic Energy Research Institute

関連論文

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• Solubility of simulated high-level radioactive wastes in CaO-stabilized zirconia.

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