A design study of fast reactor with Pb-Bi cooling system and actinide recycle has been done. The reactor consists of five regions. The first, the second, the third, the fourth and the fifth regions are respectively the blanket, the main core, the core, the reflector and the shielding. The fisrt region consists of natural uranium, where as the second and the third regions consists of enriched plutonium. The reactor cooling system is of Pb-Bi liquid. Actinide elements obtained are recycled as fuel source in the main core. The actinide elements are Neptunium (Np), Plutonium (Pu), Americium (Am) and Curium (Cu). During recycle burn up process, analysis of multiplication factor change (keff), breeding ration change, peak power density change and mass fraction composition of each actinide element have been carried out. From the result of simulation program calculation written with fortran 77, it is concluded that the fast reactor design developed has a good performance with respect to actinide element recycle. Mohammad Taufik; Fisika FMIPA UNPAD.
