Development of long-lived radionuclide partitioning technology

This study has been performed with focus on the modification of the process, advancement of separation efficiency, adaptability check for another separation technology and optimization of separation conditions. The works are summarized as follows : 1) Kinetics of denitration with formic acid by mathematical modeling, 2) Evaluation of a mutual separation process for MA and RE using DEHPA, 3) Preparation of Zr-DEHPA, and its extraction and selective stripping behaviors to separate MA form RE, 4) Adsorption and elution behaviors of RE by anion-exchange chromatography. 5) Selection of reducing agent for selective separation of Pd, and its separation condition, 6) Development of a liquid-liquid extraction device composed of a highly packed fiber bundle, and its extraction behavior by experimental and theoretical analysis. In addition, characteristics of in-situ stripping and separation of metal ions by electrolysis system of glassy carbon fiber, 7) Behavior of reductive precipitation of Eu by photochemical reaction. The results will be use as basic materials for the design and installationof the engineering test process which is scheduled to conduct in phase II. (author). 13 refs., 31 tabs., 92 figs