[en] The PUREX process in the advanced fuel. recycle will be simplified, in order to achieve cost reduction, waste minimization for environment and nuclear proliferation resistivity. One of applicable technologies to support the PUREX process is crystallization of uranium prior to the solvent extraction. Crystallization requires neither extracting solvent nor additional reagent. Therefore, it can contribute to reduce the volume of waste solution and the size of equipment of the reprocessing process. First we designed the process adapted crystallization technology and the reference process simplified PUREX. Next we compared both processes in equipment and mass flow. When the process adapted crystallization is introduced, equipment and vessels are miniaturized. Mass flow is also reduced certainly, and extra nitric acid and very low-level liquid waste is decreased largely. The PUREX with crystallization is helpful to improve the reprocessing process. (authors)