Fission and fusion reactors. Critical issue facing the long term deployment of fission and fusion breeder reactors

The purpose of the paper is to make an attempt to answer the question, which of nuclear energy sources is it necessary to develope for long term necessities: thermonuclear breeder reactor (TBR), breader reactor on fast neutrons (FBR) or both. In the light of modern presentations TBR will be more safe and acceptable from social positions and from environmental preservation point of view as compared to FBR. In the problem of fuel sources, preference will be given to fusion, but fuel reserves and resources for both energy systems are so ''unexhaustible'' for the present generation, that there is no use to give preference to either of them. As for cost of electric energy, it will be scarcely cheaper in TBR. FBR is technologically simpler than TBR and it can be built earlier. At present it is reasonable to develope nuclear enginearing based on FBR as fast as possible. It will permit to prolong the present uranium sources for several centuries in case TBR would not be developed for some reasons. It is necessary to discuss constantly and compare these two main energy sources in order to plan well-foundedly and responsibly the stable and wholesome international energetic climate, in which future generations could succeed