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鈴木 伸一; 矢板 毅; 岡本 芳浩; 塩飽 秀啓; 本橋 治彦*
Physica Scripta, T115, p.306 - 307, 2005/00
TBPを用いる核燃料再処理においてテクネチウムは非常に複雑な挙動を示す。特に、U(VI),Pu(IV)やZr(IV)が系内に共存するとテクネチウムは共抽出される。この共抽出のメカニズムとしては硝酸イオンと過テクネチウムイオンとの交換によるものであり、発表においては、U-Tc共抽出錯体の構造について同属であるRe(VII)やMn(VII)と比較しながら報告する。
Simonnet, M.; Muller, L.*; Sittel, T.*; Wessling, P.*; Mullich, U.*; Geist, A.*
no journal, ,
Reaching a sustainable nuclear waste management is one of the major challenges to gain public acceptance. The most commonly accepted solution is to process the spent fuel to recover useful isotopes, along with removing the highest heat emitters. Several processes were designed to achieve the separation of the actinides to be potentially re-used as nuclear fuel, and of Sr and Cs to decrease the heat load of the final nuclear waste to be disposed of. Most of these processes consist in a step-by-step methodology, requiring the use of many stages, except for the UNEX process that aimed at co-extracting An(III), Ln(III), Cs(I) and Sr(II) from the PUREX raffinate. Unfortunately, none of the extractants are CHON-compatible, nor the diluent that is also toxic. The present study shows the feasibility of a CHON-UNEX process, where An(III), Ln(III), Cs(I) and Sr(II) are co-extracted and then selectively stripped, allowing to merge several processes into one.