Patent ID: 8363776
Filing Date: 2013-01-29
Classification: G21C,Y02E

Abstract:
1. A boiling water reactor core of a burner type, wherein a ratio of a number of fuel assemblies loaded on the core to a number of control rod drive mechanisms for driving control rods is at least 3, wherein a fuel of fuel rods of the fuel assemblies comprises at least one of (a) a first fuel of uranium which is an oxide of a low enriched uranium having an average enrichment for the fuel rods of the fuel assemblies of 3 to 8 wt %, (b) a second fuel of uranium and plutonium which has an average enrichment concentration of fissile plutonium for the fuel rods of the fuel assemblies of 2 to less than 6 wt %, and (c) a third fuel of uranium, plutonium and minor actinides for the fuel rods of the fuel assemblies, and wherein the fuel assemblies further include at least one water rod, characterized in that a heavy metal density is a weight of the at least one of (a) the first fuel, (b) the second fuel, and (c) the third fuel of the fuel rods of the fuel assemblies having the at least one water rod contained in a unit volume of a core area of the boiling water reactor core is 2.1 to 3.4 kg/L at a time of fuel loading of the fuel assemblies in the boiling water reactor core.