| 摘要 |
900,015. Nuclear reactors. HUET, A. Oct. 10, 1958 [Nov. 14, 1957; Dec. 3, 1957], No. 32467/58. Class 39 (4). A boiling liquid type of nuclear reactor comprises a plurality of fuel rods and liquid and vapour separators disposed between the fuel rods, each separator comprising a helical surface surrounding a tubular member whose wall is apertured between the turns of the helix to permit the escape of vapour, and the fuel rods being disposed in such a manner as to provide passages between the rods to accommodate the separators, the shape and area of a passage being substantially equal to that of a separator in the passage. As shown in the plan view in Fig. 1, the fuel rods a may have a pin-cushion shaped cross-section to provide cylindrical passages between the fuel rods, gaps between the rods being closed by aluminium plates, each of which is secured to one of the rods and presses resiliently against an adjacent rod. The separators, Fig. 2, each comprise a helical surface b mounted on a tube c provided with outlets e through which vapour passes to the interior of the tube. The liquid, which may be water or heavy water, is prevented from passing through the outlets e by centrifugal force. The pitch of the helical surface b may vary along the length of the separator and may be different for different separators. Deflecting devices (not shown in Fig. 2) may be provided inside the tube c to direct the vapour in the desired direction, and the outlets e may be provided with vanes or flaps. Means described in Specification 857,675 may be provided for varying the spacing of the fuel rods and separators simultaneously. Control rods g may be inserted inside the tubes c. |
