Patent ID: 6512805
Filing Date: 2003-01-28
Classification: G21C,Y02E

Abstract:
A light water reactor core comprising fuel which is enriched by adding plutonium or plutonium and an actinide to a uranium containing at least one of a depleted uranium, natural uranium, a degraded uranium and a low enriched uranium, which further comprises:fuel assemblies having fuel rods arranged in a triangular lattice configuration; and large-diameter control rods to be inserted into said fuel assemblies, said large-diameter control rod comprising at least one absorption rod and guide tubes in which said large diameter control rods are inserted, each said guide tube being disposed in a region having an area equivalent to at least 7 fuel rod unit lattice cells, wherein a breeding ratio of the reactor core is near 1.0 or larger than 1.0, and a void coefficient of the reactor core is negative.