| 摘要 |
<p>1,054,702. Reactors. SOC. ANON. ANGLOBELGE VULCAIN. Jan. 26, 1965 [Feb. 7, 1964], No. 3318/65. Heading G6C. A baffle for surrounding the core of a liquidmoderated nuclear reactor is formed of several elements of corrosion-resistant material, e.g. zirconium alloy, the edges of the elements being bent to form ribs which serve both for the joining of the elements to one another and for increasing the rigidity of the baffle sufficiently to prevent its distortion by the differences of pressure to which it is subjected. In one embodiment (Fig. 4, not shown), the reactor core is of hexagonal cross-section and the baffle consists of an assembly of six prefabricated portions 11 which correspond to the six sides of the core. Each portion 11 is formed of five V-shaped elements 12, the faces 13 and 14 of which are bent so as to form between them angles of 120 degrees (Fig. 5, not shown). The elements 12 are assembled by welding of their faces 14 so as to form reinforcing ridges. The corners of the portions 11 are formed from profiled elements 15, which may be thicker than the elements 12 so as to reinforce the baffle. The portions 11 are fixed at each end to segments 16 which on assembly form flanges 17 around the baffle. The segments 16 are provided with oval openings 18 to receive keys by which the baffle can be mounted in the reactor structure whilst permitting thermal expansion of the baffle. In order to increase the rigidity of the baffle, circular bands 19 are mounted around its periphery, and the rigidity may be further increased by bending over the edges of the bands 19 to form beads 20. In an alternative embodiment, the baffle which is particularly adapted to be assembled around a core having a corrugated surface, is formed from elements which are not all of identical profile. By means of the elements of this invention, it is possible to reduce the thickness of the baffle to about 2 mm., a thickness of 6 mm. being necessary for the same rigidity in the case of a baffle without reinforcing ridges. The reinforcing ridges may form cavities with the rings 19 which become filled with liquid if a liquid reflector is used, thus increasing the thermal insulation between the core and the reflector.</p> |
