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Technetium separation for future reprocessing

将来の再処理のためのテクネチウム分離

朝倉 俊英; 宝徳 忍 ; 伴 康俊  ; 松村 正和; 森田 泰治  

Asakura, Toshihide; Hotoku, Shinobu; Ban, Yasutoshi; Matsumura, Masakazu; Morita, Yasuji

PUREX技術に基づいたTcの抽出分離試験を、燃焼度44GWd/tの使用済ウラン燃料を用いて行った。試験結果を、シミュレーションコードESSCAR(Extraction System Simulation Code for Advanced Reprocessing)を用いて検討した。TBP抽出によって、Tcを溶解液からほぼ定量的に抽出し、高濃度硝酸スクラブによって抽出されたTcを定量的に回収できることを示した。さらに、Tcの抽出機構では、ZrとUとの共抽出効果が支配的な要因であることをESSCARコードによる計算結果から示した。

Tc extraction and separation experiments were performed basing on PUREX technique with using spent UO$$_{2}$$ fuel with burn-up of 44 GWd/t. The experimental results were examined with performing calculations by a simulation code ESSCAR (Extraction System Simulation Code for Advanced Reprocessing). It was demonstrated that Tc can be almost quantitatively extracted from a dissolver solution and that Tc can also be almost quantitatively recovered by scrubbing. Further, it was clearly presented from the calculation results of ESSCAR that the extraction mechanism of Tc is dominated by the synergistic effect of Zr and U.

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