Patent Number: 043354670
Section: claims

1. A liquid metal cooled nuclear reactor comprising in combination (a) a vessel for receiving the reactor core and said liquid metal;  (b) at least one heat exchanger for ensuring a heat exchange between said liquid metal and a second fluid;  (c) a first duct for connecting said vessel with the inlet of the heat exchanger, said duct opening into said vessel above the core; and  (d) a second duct for connecting said vessel with the outlet of said heat exchanger said vessel being provided, along the outer periphery thereof, with a first supporting means situated between said ducts said first duct being substantially rectilinear and horizontal and opening into said vessel above, and in the vicinity of, said first supporting means, said heat exchanger provided with a second supporting means at a level that is above the reactor support level wherein the stresses resulting from differential expansions of the ducts are reduced and constituted by at least two supporting members diametrically opposed with respect to the vertical axis of the exchanger outer cover, each of said supporting members comprising a horizontal fixed support plate, a horizontal backing plate integral with said exchanger and situated above said support plate, and a first plurality of rollers between said plates, the axes of revolution of said rollers being at right angles to the direction of said tubing; and wherein each supporting member comprises a second series of rollers parallel to said first series, said second rollers being arranged above said backing plate and bound to said supporting plate so mounted that there is a clearance between said rollers and said backing plate such supporting member also comprising a horizontal upper plate for the abutment of the rollers of said second series, said plate being integral with said support plate and so arranged that whenever the heat exchanger assumes an abnormal movement, said rollers of the second series come into abutment with said horizontal upper plate as well as a third series of rollers with vertical axis with respect to the reactor, adapted to form an abutment, in the case of horizontal movements, between said backing plate and a vertical extension of said supporting plate. 2. A nuclear reactor as in claim 1, wherein said vessel comprises a main outer vessel provided with said first supporting means, a primary inner vessel coaxial with said outer vessel, said primary vessel containing said core and provided with third supporting means constituted by first parts integral with the main vessel inner surface and by second parts integral with the primary vessel outer surface and resting on said first parts, said third supporting means being situated at said predetermined level, wherein said first duct opens into said primary vessel above said core and passes through the annular space between said main vessel and said primary vessel, and wherein said second duct opens into said annular space situated at a lower level below the support means. 3. A nuclear reactor as in claim 1, wherein the centers of gravity of both the heat exchanger and the reactor vessel are situated below the respective supporting levels.