ABSTRACT
In the event of a massive use of nuclear power it is clear that any production system should be fuel breeding. Hybrid systems have very good characteristics in this respect. They would allow switching from a plutonium economy to a much less polluting thorium one. They could, in principle, allow the implementation of intrinsically safe reactors. They are also an attractive option for nuclear waste incineration, including minor actinides which would be difficult fuels for critical reactors. In their molten salt version they could allow fast plutonium incineration.
