| 摘要 |
<p>The invention relates to a nuclear-reactor fuel assembly including fuel-rod supporting transverse grids. …<??>The fuel assembly includes at least one additional transverse grid which is disposed between two fuel-rod supporting grids and consists of at least one partial grid structure (24) extending across only a portion of the fuel assembly and having fuel rods (18) and control-rod guide thimbles (14) of only said portion extending therethrough. The partial grid structure includes means for providing lateral support of the fuel rods and/or means (42 and 58) for laterally deflecting coolant flow, and it is formed of interleaved inner straps (34) and border straps (48,50), the interleaved inner straps preferably being of substantially smaller height than the border straps to reduce the amount of material capable of parasitcally absorbing neutrons. The additional transverse grid may comprise several partial grid structures associated with different groups of fuel rods of the fuel assembly.</p> |
