Abstract
Recycled uranium can be refined using physical or chemical properties of fission products or transuranic elements at the fluorination step of the uranium conversion process. Some impurities, which possess lower vapour pressure than uranium, are apt to remain in solid phase during uranium fluorination. Some volatile impurities in the gaseous uranium fluoride are removed by applying the chemical trap. During the operation of uranium conversion facility, sampling was carried out at each step of the uranium conversion process and the behaviour of impurities in recycled uranium was evaluated after analyzing the samples. As a result, some useful data were obtained on the decontamination factors of impurities at each step of the process, the transfer of impurities from uranium to the process, and the absorption efficiency of the fillers in the chemical trap, all of which contribute towards the better design of a future uranium conversion facility.
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