Importance

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Abstract

Disclosed are fuel assemblies that are loaded in the core of a fast reactor including first fuel assemblies and second fuel assemblies being different from the first fuel assemblies. The reactor core has an axially heterogeneous core structure in which an internal blanket region containing depleted uranium fuel is placed around an axially middle section of the core. The first fuel assemblies are loaded in an outer core fuel region extending toward the periphery of the reactor core in a radial direction and the second fuel assemblies are loaded in an inner core fuel region extending around the center of the reactor core in a radial direction. Thickness of an internal blanket in each of the first fuel assemblies in an axial direction of the reactor core is thicker than thickness of an internal blanket in each of the second fuel assemblies in the axial direction of the reactor core.

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First Claim