Considering the Technology of Fast Breeder Reactor Cycle System

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It is speculated that many people know the fact that research and development on Fast Breeder Reactor and the related Nuclear Fuel Cycle is performed in Japan. However, it is not well understood the exact status of R&D on FBR cycle system after the sodium leak accident that occurred in Monju. A very few specialist of FBR seems to know that FBR cycle system was closed. Thus, the way how the FBR cycle system was closed and the continuous R&D activities up to now are introduced in this report from the technical point of view. The FBR cycle system is considered to be the fission energy utilization system having the capabilities such as high uranium utilization, the relief of the impact on environment due to annihilation of fission products and minor actinides in the FBR core, and the high resistance for proliferation. The FBR cycle system has many important advantages shown above. If the enhancement of FBR cycle characteristics in economical and safety aspect might be possible, the system considered to be the ideal system for fission energy utilization. Therefore, the important information about R&D on FBR cycle system is introduced here together with the private concept on the items and the procedure of R&D related FBR cycle system demonstration.