초록 ▼

A fuel assembly for a boiling water reactor comprising a plurality of fuel units, stacked on top of each other, each of which comprising a plurality of fuel rods extending vertically between a top tie plate and a bottom tie plate, and means for keeping the fuel elements together. The fuel elements a

A fuel assembly for a boiling water reactor comprising a plurality of fuel units, stacked on top of each other, each of which comprising a plurality of fuel rods extending vertically between a top tie plate and a bottom tie plate, and means for keeping the fuel elements together. The fuel elements are surrounded by a fuel channel with a substantially square cross section. At least two of the fuel units differ from each other in regard to fuel distribution or free flow area.

대표청구항 ▼

1. A nuclear light water moderated boiling water reactor comprising:a plurality of fuel assemblies arranged vertically in the reactor, the reactor being arranged such that water flows upwards through said fuel assemblies whereby part of the water is transformed into steam; at least one of the fuel a

1. A nuclear light water moderated boiling water reactor comprising:a plurality of fuel assemblies arranged vertically in the reactor, the reactor being arranged such that water flows upwards through said fuel assemblies whereby part of the water is transformed into steam; at least one of the fuel assemblies comprising at least five fuel units stacked on top of each other, each fuel unit comprising a top tie plate and a bottom tie plate and a plurality of fuel rods extending between the top tie plate and the bottom tie plate; at least one of said fuel units having fuel rods of different diameters from fuel rods of another of said fuel units; and said at least one fuel assembly having a fuel channel with a substantially square cross section surrounding the stack of said at least five fuel units.