JPH0476594B

This invention relates to an improved neutron reflector, particularly for use in a pressurized water nuclear reactor. The neutron reflector is a rod-like element (21) comprising neutron reflective material (10) and having a substantially square cross-sectional configuration, with at least one coolant-flow groove (22) formed in each side of the rod like element and extending longitudinally throughout the length thereof. In a preferred embodiment, the rod-like element comprises a cladding tube (14) and a plurality of neutron reflective blocks (10) stacked therein. To facilitate insertion of the blocks into the tube, the latter, in its initial shape, provides sufficient clearance for the blocks to be easily inserted and stacked. When stacking is completed, and before the neutron reflector is put to use, it is subjected to temperature and external pressure sufficient to collapse the cladding onto the blocks.