| 摘要 |
1,057,792. Fuel assemblies. ALFA-LAVAL A.B. March 4, 1965 [March 4, 1964], No. 9337/65. Heading G6C. A fuel assembly comprises separate fuel elements built up with supporting members to form an elongate fuel body with spacing between the elements which extends from end to end of the fuel body, there being a main coolant channel extending longitudinally of the body and communicating with the interspaces therein. The fuel body interspaces communicate on the opposite side of the fuel body with the surroundings; the main coolant channel and surroundings are in coolant flow communication with the fuel body interspaces along the entire length of the body, and coolant flow guide means are provided to cause flow in a direction which is inclined to the fuel body longitudinal axis; the ratio of the magnitudes of the components of this flow remains substantially constant along the length of the fuel body. In Fig. 1, a perforated outer tube 4 extends between fuel end supports 1, 2, and contains two concentric circles of fuel rods 6 arranged concentrically about a concentric parabolic filling body 14 supported by end support 1 in a position concentric to the tube 4. Coolant enters at 12 and flows in an axially inclined direction through the fuel interspaces and out through perforations 3 in the tube 4. In further embodiments the apertures in the tube 4 are replaced by circumferential slots which extend round the tube. The outer tube may be formed by a series of frusto-conical portions interconnected by tie bars and the frusto-conical sections may have two different cone angles, with their small diameter ends partially entered in the large diameter end of the adjacent section, thereby forming a series of annular outlet nozzles. A modified filling member 14 is hollow and is perforated; coolant enters the fuel assembly by way of the interior of the filling member, and leaves as in Fig. 1. The filling body 14 may be replaced by an axial column of partially nested frusto-conical guide sections. In one embodiment, the fuel rods are replaced by spheres spaced apart between perforated tubes.
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