Fast neutron reactor and method of refueling.

摘要

A fast neutron reactor core (1) comprising a bundle of fuel assemblies each containing a fuel made of a fissile material-enriched fertile material. In a transition cycle between an initial charging cycle and an equilibrium cycle of said core, a fuel assembly in a peripheral portion (12) of said core (1) is replaced with a fuel assembly containing a fuel having a greater neutron infinite multiplication factor than the fuel in said equilibrium cycle. Further a method of refueling in such a fast neutron reactor core (1) is disclosed.