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論文

Alteration of fuel debris simulants by Bacillus subtilis

Liu, J.; 土津田雄馬; 北垣徹; 青柳登; Mei, H.; 高野公秀; 香西直文

Journal of Nuclear Science and Technology, 60(8), p.1002 - 1012, 2023/08

https://doi.org/10.1080/00223131.2022.2162995

被引用回数：1 パーセンタイル：18.87(Nuclear Science & Technology)

This study aims to reveal the potential bacterial alteration of nuclear fuel debris. A melt simulant composed of U $_{0.5}$ Zr $_{0.5}$ O $_{2}$ and Fe(0), and three powder simulants (UO $_{2}$ , Fe(0), and their mixed powder) were prepared and exposed to Bacillus subtilis in a Fe-deficient medium under aerobic conditions. B. subtilis could not dissolve Zr from the melt simulant but enhanced the dissolution of U and Fe, although the change of the melt simulant was too small to evaluate. Experiments using powder simulants were performed to investigate the bacterial influence in detail. B. subtilis enhanced the dissolution of U from the UO $_{2}$ powder and Fe from the Fe(0) powder, although the dissolution of U was low. Most aqueous U species were probably U(VI), while the U that remained as a solid phase was mostly U(IV). The Fe(0) powder was oxidized by this bacterium, transforming it into an aqueous and solid Fe species. The stable species consisted of amorphous nano-sized particles. A fraction of the dissolved Fe was adsorbed or precipitated onto the UO $_{2}$ particles and remained undissolved. These results strongly suggest that bacteria can degrade nuclear fuel debris, although this study did not elucidate the mechanism of oxidative dissolution.

論文

Demonstrating feasible disposable concepts for long half-life, low heat generating radioactive wastes in Japan; An overview of project TRU-2

Martin, A. J.*; 亀井玄人; 塩月正雄; 黒田茂樹*

Proceedings of International Waste Management Symposium 2007 (WM '07) (CD-ROM), 12 Pages, 2007/03

日本の電気事業連合会と日本原子力研究開発機構は、高レベル廃棄物処分の研究成果を基盤としつつ、TRU廃棄物の安全な処分について、関係機関と研究開発を行ってきた。この研究協力(プロジェクトTRU-2)は、日本のTRU廃棄物処分の研究開発に一つの進展をもたらした。本論文は、このプロジェクトの概要を記すもので、鍵となる成果と幾つかの独創的方法論が示されている。

論文