Patent ID: 7424085
Filing Date: 2008-09-09
Classification: G21C,Y02E

Abstract:
1. A cluster for adjusting a pressurised water nuclear reactor comprising: a bundle of neutron-absorbing rods, each comprising a metal tube called cladding which is sealed off at an upper extremity by a top end plug and at a lower extremity by a bottom end plug and a support of radiating shape, to which the absorbing rods are attached through the top end plugs, wherein the cladding of at least one of the absorber rods are weld-free hafnium tubes, the top end plugs of the absorber rods having hafnium cladding are of a titanium-based alloy, the titanium base alloy being welded to the upper extremity of the hafnium cladding of the absorber rod, and the bottom end plugs being of hafnium and welded to the lower extremity of the hafnium cladding of the absorber rod.