[en] The recession, increasing energy costs, recent studies like NASAP and INFCE, recent innovations and new developments have resulted in a new situation in the energy field. Even near term nuclear power R and D planning requires thus concurrent studies of spallation (accelerator) and fusion/fission hybrid breeding. A first overview of these and other novel reactors is presented. It is now realized more than before that the energy production must be based on optimal synergetics based on symbiotic systems that include a larger variety of energy sources, even if we restrict us, as in this report, to nuclear power. A central factor is the considerations associated with the constraints of fuel supplies, of enriched fissile fuels, of U and Th and of fusile fuels (T). This report emphasizes the inherent characteristics of various energy producing machines and symbiotic systems in this respect including the status, national programmes, environmental impacts and their expected break-even U-prices as reported in the literature. (Author)