[en] The calculational analysis of indexes for different versions of the multicomponent nuclear power (NP) model using various types of breeders is conducted. Three main versions of the developing NP with reactors of different types are considered: a) without the NP system additional feeding from an external source, b) with the NP system additional feeding with fuel from a special breeder not supplying electric energy to the system, c) with the NP system additional feeding with nuclear fuel from a breeder which supplies electric energy to the system as well. The analysis of relations obtained shows that in the closed-in- fuel NP model under consideration there are practically no sufficient realistic conditions for use of the special secondary nuclear fuel breeders without producing parallel to the fuel also the energy for the system. One of the basic arguments which proves the necessity of alternative breeder development is the requirement of assuring the future NP applicable structure in which about 50-60% of energy should be generated by thermal reactors. Investigations show that fast BN-type reactors with impved fuel, for example, using metal fuel assure the possiro/ bility of the NP closed-in-fuel model development with the given part of NPPs with thermal reactors