2009 年 8 巻 3 号 p. 245-253
The behavior of Cs in the U crystallization of an advanced aqueous reprocessing system was investigated. A beaker-scale U crystallization experiment was carried out with a certain simulated dissolver solution. Results show that the possibility of the generation of CsNO3, Cs2UO2(NO3)4 or Cs-FP complex salt is small. A precipitation experiment of Cs-U(IV) complex salts was also carried out with a nitrate solution of U(IV) and Cs. It was found that Cs2U(NO3)6 precipitates at an acidity higher than 5 mol dm−3. It is considered that Cs2Pu(NO3)6 precipitates can be generated in a U crystallization process under a specific solution condition.