[en] The current status and scientific and technological problems of the nuclear fuel cycle are viewed. The questions of provision of the nuclear power by the fissionable materials are discussed, the priorities of choosing materials, construction of the fuel elements are pointed. The effective technologies of the spent fuel, radioactive waste handling are under consideration. The efficiency of the closed fuel cycle, the advantages of the pyroelectrochemical processes in the spent nuclear fuel reprocessing are determined. The schemes of the boron carbide reprocessing from the spent rods and zirconium recyclization, the characteristics of the reprocessing product characteristics are given. The principles of the increasing efficiency in a nuclear power are formulated