| 摘要 |
1,190,046. Fuel elements. ATOMENERGI A.B. 2 Aug., 1967 [15 Aug., 1966], No. 35497/67. Heading G6C. A spacer grid for a cluster-type fuel element comprises a plurality of annular members ecured to each other, each annular member containing two rigid supports for a fuel rod, the supports being inwardly bent portions of the the annular member, and further containing a resilient support for the fuel rod. As shown in Fig. 1, the annular members 2 are welded to each other, and to a central sleeve member 3 and an outer ring 1. Each annular member 2 contains two rigid supports 4 formed by providing two parallel slots in the wall of the member and bending the wall portion between the slots towards the centre of the member. Each annular member 2 also contains one resilient support consisting of a spring member 5 secured to the member wall by means of a rivet 6. The spring member 5 has two fingers 7 engaging the edge of the annular member 2 to ensure a firm connection between the spring member and the annular member. If, during operation, a fuel rod is subjected to bending, the spring member 5 will yield until the fuel rod contacts the rivet 6 and any further bending is then impossible. A support rod or tube is inserted into the central sleeve member 3, and two adjacent spacer grids are kept at the desired distance apart by means of a spacing tube surrounding the support rod or tube. The spring member may have but one arm (Fig. 4, not shown), one end of the spring member being bent outward to engage the edge of the annular member to ensure a firm connection between the spring member and the annular member. In a second embodiment (Fig. 2, not shown) the resilient support consists of a curved leaf spring, one end of which rests on a protruding portion of the annular member while the other end is bent through 180 degrees so as to resiliently engage a second protruding portion of the annular member. |
