Plutonium and other actinides behaviour in NEXT process

Miura, Sachiko ; Nakahara, Masaumi; Sano, Yuichi   ; Kamiya, Masayoshi ; Nomura, Kazunori  ; Komaki, Jun

The behaviour of Pu and other actinides in the crystallization process and U-Pu-Np co-recovery process was discussed. Pu showed the different behaviour in the crystallization process according to its valence in the dissolver solution. Low DF of Cs in some crystallization conditions might be related with the formation of some kinds of Cs compounds with Pu in the dissolver solution. In the U-Pu-Np co-recovery process, Although there are some considerable points, e.g. temperature control in the stripping section, suitable condition for Np extraction, etc., we confirmed that it was possible to co-recover U-Pu-Np under the appropriate condition.