984, 439. Nuclear reactors. SOC. ANGLOBELGE VULCAIN S.A. Feb. 21, 1962 [March 9, 1961], No. 6690/62. Heading G6C. A structure for a nuclear reactor comprises fuel elements, a support for these elements, a member for reactivity control and an actuating mechanism for the latter member, the structure being adapted to be removed from and inserted into the reactor vessel as a unit. In one embodiment (Fig. 1), fuel elements 1 are arranged around a support tube 2 in which a tubular shut down or control rod 3 is mounted along with its actuating mechanism 4. A liquid, which may be a moderator, enters the tube 2 through an inlet 5 and leaves through the outlets 6, 7. In an alternative embodiment (Fig. 2), fuel elements 11 are placed inside a support tube 12, a shut down or control rod 13 of circular crosssection surrounding the tube 12 and being connected to an actuating mechanism 14 through a longitudinal slot 18 by means of a linkage 19. A coolant enters the tube 12 through an inlet 15 and leaves through the outlets 16, 17. The shut down or control rods 3, 13 may consist of a cage, for instance of the squirrel cage type.
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