[2B01-05] 事故炉の廃止措置1

[2B05] 燃料デブリ分析のための超微量分析技術の開発

(13)アルカリ融解法を用いたウランとジルコニウムの混合比の異なる模擬デブリの酸溶解特性

*麻 卓然¹、風間 裕行³、本間 佳哉²、小無 健司²、鈴木 達也¹ (1. 長岡技術科学大学、2. 東北大学、3. 日本原子力研究開発機構)

キーワード：模擬デブリ、アルカリ融解、溶解

The dissolution of nuclear fuel debris generated from Fukushima nuclear power plant accident is necessary for the accurate and precise analyses of actinides and fission products. We have proposed the chemical conversion of insoluble nuclear fuel debris into soluble substances by alkaline fusion method. In the present work, the dissolution behavior in Nitric acid and Hydrochloric acid of simulated nuclear debris including UO₂-ZrO₂ by alkaline fusion reaction with reagent Na₂O₂ were studied. For the simulated debris with U-Zr mole ratio of 1 to 1 and sintered for 10 minutes at 1400℃, they were ground and mixed with Na₂O₂ with mass ratio of 1 to 10. After heating at 650℃ for 1 hour, they were dissolved with 6mol/l nitric acid. The dissolution rate reached more than 99% by the weight of residue after pressure filtration.