Patent Number: 042959349
Section: claims

1. A liquid metal cooled nuclear reactor comprising: 2. The nuclear reactor according to claim 1, wherein said first duct is constituted by a piping connected to the inlet of the heat-exchanger, on the one hand, and to an orifice provided in said main vessel, on the other hand, and by a small sleeve, one extremity of which is tightly connected to said primary vessel, whereas its other extremity, that is free, penetrating into said piping is surrounded by a semi-tight gasket adapted to co-operate with the inner surface of said tubing. 3. The nuclear reactor according to claim 2, wherein said small sleeve is surrounded by a thermally insulating sleeve fixed thereto, and wherein said insulating sleeve is surrounded by a thermally insulating sheath, one extremity of which is integral with said primary vessel. 4. The nuclear reactor according to claim 2, wherein said semi-tight gasket is constituted by a ring mounted with some clearance in a circular groove provided in the outer surface of said small sleeve in the vicinity of the free extremity of the latter, that surface of said ring cooperating with said tubing being of rounded shape so as to form a ball-joint. 5. The nuclear reactor according to claim 1, wherein the second duct for feeding back the cooled liquid metal penetrates into said main vessel at a lower level than the horizontal partition that divides the annular space between said primary vessel and said main vessel. 6. A nuclear reactor according to claim 1, wherein said second duct for the cooled liquid metal penetrates into said main vessel at a lower level than said horizontal partition situated in the vicinity of the supporting plane of the two vessels, and opens into an annular space between said main vessel and the primary vessel supporting means, said annular space being in communication, via said horizontal partition, with the space defined by the lower portions of said primary and main vessels.