Abstract
for heterogeneous cores. The general conclusion is that heterogeneous cores, particularly the first two forms, enable one to improve the BF but lead to appreciable determination in fuel-cycle characteristics. At present, the fuel component in the electrical power cost is large, and this may adversely affect the economic performance. This is the more so in that plutonium stocks formed in thermal reactors are accumulating rapidly. The plutonium should be returned to circulation, not stocked. Even from the viewpont of plutonium accumulation (for given costs), it may be more favorable to develop fast reactors with homogeneous cores, although with lower BF, but based on a cheaper fuel cycle. When necessary, and when the economic need is shown (for example, with low reprocessing costs), one can transfer in the same reactors to cores with higher BF. Research on all aspects of reactor physics and fuel-cycle parameters should be continued for the various types of core.
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