| 摘要 |
<p>(i) A spacer having a matrix of individual cells, each cell surrounding a fuel rod. Each cell includes a stop for centring the fuel rod and a spring for biasing the fuel rod into the stop. Each spacer cell (S) also includes upper and lower octagonal crowns (C1 and C2). The panels forming these crowns are joined to like panels of adjacent cells, in a single thickness, along horizontal edges so that the like panels are in vertical co-planar alignment. (ii) A spacer as in (i) above where the panels have edge means for adjoining like panels in single thickness from adjacent panel cells including a full panel height (12, 14, 16, 18) adjoining the defined sub-channel volume between fuel rods and vertically aligned co-planar half height walls (11, 13, 15, 17) adjoining adjacent cells. Crowns at opposite ends of each octagonal spacer cell have inverted edge means so that cells surrounding a central cell are inverted with respect to the central cell and the crowns form a single thickness in forming upper and lower crown matrices holding adjoining cells of the spacer together. (iii) A spacer as in (ii) above in which the stop includes cell legs, extending between the crowns with upper and lower stops immediately adjacent the crowns and in which the spring includes cell legs, extending between the crowns defining the required cell springs, with spring contact points centrally of the legs with respect to the crowns.</p> |
