公开(公告)号：US20180122522A1

公开(公告)日：2018-05-03

申请号：US15786877

申请日：2017-10-18

Applicant: Hitachi, Ltd.

Inventor： Michitaka ONO ,  Motoo AOYAMA ,  Takeshi MITSUYASU

IPC: G21C19/20 ,  G21C3/30

CPC classification number: G21C19/205 ,  G21C3/30 ,  G21C5/18 ,  Y02E30/40

Abstract: There is provided a core of a boiling water reactor that can be operated without loading a new fuel assembly at an operation cycle before decommissioning. In the core of the boiling water reactor in which multiple fuel assemblies are loaded in a square lattice shape, during the fuel exchange, dispositions of the multiple fuel assemblies loaded into the core are changed without loading a new fuel assembly in the core, based on the number of residence cycles, in the core, of fuel assemblies laterally adjacent and longitudinally adjacent to a fuel assembly having the shortest loading period in core cross section and the number of residence cycles, in the core, of fuel assemblies diagonally adjacent thereto, among fuel assemblies loaded into the core after the fuel exchange without loading a fuel assembly having a shorter loading period than a fuel assembly having the shortest loading period loaded into the core before the fuel exchange in the core after the fuel exchange.