Patent ID: 6353652
Filing Date: 2002-03-05
Classification: G21C,Y02E

Abstract:
A fuel assembly for a boiling water reactor wherein during operation coolant flows through the fuel assembly, comprisingan upper part, a lower part (10), a plurality of full length rods (3a, 3c) extending through both the lower part and the upper part of the fuel assembly, at least one part length rod extending only in the lower assembly part of the fuel assembly, and an open region (15) which is formed above the or each part length rod, characterized in that at least half of the full length fuel rods having positions immediately adjacent to the or each part length rod are arranged such that they are bent inwards towards the open region (15) above the or each part length rod and at least the majority of the coolant channels which adjoin the open region above the part length rod have a first cross-section area (A1) in the lower part (10) of the fuel assembly and a second cross-section area (A2) in the upper part of the fuel assembly, the second cross-section area being larger than the first cross-section area, and that at least half of the fuel rods in the fuel assembly are straight.