Patent ID: 7469029

Claim:
A control rod blade for a boiling water reactor, wherein the control rod blade comprises a free edge portion with a recess having an opening and a wall surface, which comprises a plurality of outlets, arranged in a row in the wall surface, for channels, which are arranged to receive an absorber material and a cover element arranged to be attached along the free edge portion of the control rod blade, which cover element comprises a cover portion arranged to seal the opening of the recess and a support portion which has a contact surface arranged to, in a mounted state, abut a bottom surface of the wall surface in the recess and to form at least one passage between the outlets of the channels in the recess, the cover portion further being arranged to form an external end surface of the control rod blade in a mounted state, wherein the support portion has a width which is less than the width of the recess and the outlet of the channels such that at least one passage between the outlets of the channels in the recess is formed, characterized in that the support portion has a substantially plane contact surface which is arranged to abut a corresponding plane bottom surface in the recess, and wherein the cover element has a substantially T-.shaped cross-section profile.