The purpose of this report is to review the developing status of the fast breeder project in Japan.
In chapters 1 and 2 the backbone of the inevitability to develop the fast breeder reactor is explained and the present status of the development of the FBRs in each country, especially the positioning of Japan in the world is briefly described.
In chapters 3 and 4 the principle and features of the fast breeder reacter are reviewed from the viewpoints of reactor physics, plant design, coolant characteristics, fuel materials and structural materials.
In the last chapter the present status of the first experimental fast reactor of Japan, “JOYO”, is reported.