Patent ID: 9053825
Filing Date: 2015-06-09
Classification: G21C,Y02E

Abstract:
1. A fuel assembly for a nuclear boiling water reactor, wherein the reactor comprises a plurality of fuel assemblies, and a plurality of control rods, each control rod being insertable in a respective control rod position between the fuel assemblies, the fuel assembly includes a longitudinal center axis and further comprises; a plurality of elongated fuel rods, each fuel rod comprising nuclear fuel enclosed by a cladding, the fuel rods being held in predetermined positions relative one another, and an elongated channel box forming an outer casing of the fuel assembly and enclosing the fuel rods, the channel box having inner sides, facing the fuel rods, and outer sides, each inner side and each outer side having a longitudinal center line extending substantially in parallel with the center axis and along the length of the channel box, protrusions are provided on the channel box to protrude from a respective one of at least two of the outer sides, on each of said at least two outer sides a plurality of said protrusions being provided and being distributed at a first distance from each other along the center line of the respective one of the at least two outer sides, said first distance being at least 50 mm, wherein the plurality of protrusions are configured to provide a minimum second distance between the outer side and an adjacent control rod, and to enable the control rod to easily slide over and on top of the plurality of protrusions; and wherein the protrusions have a curved shape, the curved shape facilitating the sliding of a control rod blade of the control rod over and on top of the protrusions.