Patent ID: 9490036
Filing Date: 2016-11-08
CPC Classification: G21C,Y02E

Claim Text:
1. A control rod for a nuclear boiling water reactor, wherein the reactor comprises a plurality of fuel assemblies, elongated channel boxes forming outer casings of each fuel assembly and enclosing fuel rods, and a plurality of control rods which are configured to be insertable in respective control rod positions between the fuel assemblies, wherein the control rod has a longitudinal center axis and control rod blades, each control rod blade having a first and a second side and being substantially parallel to the longitudinal center axis, and wherein each control rod blade comprises an absorber material which extends along the longitudinal centre axis from a first absorber end to a second absorber end, a distance between the first absorber end and the second absorber end defining an active length of the control rod blade, wherein the control rod blades are provided with distance means on the first and second sides of the control rod blades, the distance means extending a distance of at least a third of the active length of the control rod blade, the distance means being configured to ensure a minimum distance between the control rod blade and the channel box, and to enable the control rod to easily slide along the channel box, wherein the distance means have the form of protrusions, each of which protrudes 0.5-2 mm from the sides of the control rod blades, wherein the distance means are press formed in, or welded onto, the control rod blades and form a homogeneous part of the control rod blades, wherein each of the protrusions comprises an elongated ridge and the ridges are provided along lines extending in parallel to the longitudinal center axis and distributed along a width of the first and second sides, radially out from the longitudinal center axis.