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US 4,378,329 AGranted
Nuclear reactor core construction
AssigneeHitachi, Ltd.
InventorsSadao Uchikawa, Motomasa Fuse, Yasuhiro Kobayashi, Renzo Takeda
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AssigneeHitachi, Ltd.
InventorsSadao Uchikawa, Motomasa Fuse, Yasuhiro Kobayashi, Renzo Takeda
Estimating the term…
A core construction for a nuclear reactor having a multiplicity of fuel cells forming a core in which each fuel cell includes four fuel assemblies arranged in adjacent relationship and one control rod insertable into a position surrounded by the four fuel assemblies. The fuel cells includes first fuel cells each having a relatively high cell mean infinite neutron multiplication factor and including one fuel assembly containing a burnable poison, and second fuel cells each having a relatively low cell mean infinite neutron multiplication factor and including no fuel assembly containing a burnable poison. The first fuel cells are arranged both in a central zone of the core disposed within about one-half the core radius from the center of the core and in a circumferential zone of the core outside the central zone. The second fuel cells are arranged only in the central zone and no second fuel cells are arranged in the circumferential zone. Only the second fuel cells provide control cells in which the control rods are operative to adjust core reactivity changes and power distribution changes during normal power operation of the reactor.
A core construction for a nuclear reactor comprising a multiplicity of fuel cells forming a core in which each fuel cell includes four fuel assemblies arranged in adjacent relationship and one control rod insertable into a position surrounded by said four fuel assemblies, wherein said fuel cells include first fuel cells each having a relatively high cell mean infinite neutron multiplication factor and including one fuel assembly containing a burnable poison, and second fuel cells each having a relatively low cell mean infinite neutron multiplication factor and including no fuel assembly containing a burnable poison, said first fuel cells being arranged both in a central zone of the core and in a circumferential zone of the core outside said central zone of the core, said second fuel cells being arranged only in said central zone of the core and no second fuel cells being arranged in said circumferential zone of the core, only said second fuel cells including control cells in which said control rods are operative to adjust core reactivity changes and power distribution changes during normal power operation of the reactor.
Dependencies are inferred from the claim text.