Device for thermal protection of a component of a fast-neutron nuclear reactor

摘要

The invention relates to a device for thermal protection of a component of a fast-neutron nuclear reactor consisting of at least one shell (10, 11) of a diameter smaller than the diameter of the passage (2) for the component (4) but greater than the diameter of the component (4). The length of the shell (10, 11) fixed under the flange (5) of the component (4) is greater than the slab thickness (1). Circulation of blanket gas (13) is established in the annular space (7) between the component (4) and the passage (2). The invention applies in particular to nuclear reactors cooled with liquid sodium whose upper level is under an argon blanket.