| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fuel assembly grid capable of keeping compatible with a conventional square-lattice fuel assembly grid with the equal numbers and equal positions of supported fuel rods and control rod guide pipes, preventing occurrence of buckling to a support plate and deformation of cells even if a plurality of fuel assemblies collide in the grid due to an earthquake or the like, and achieving excellent aseismatic performance.SOLUTION: In a nuclear reactor fuel assembly grid including a support plate supporting each of a plurality of fuel rods arranged in a square array, the support plate forms cells of an isosceles triangle shape such that the cells and cells turned upside down are alternately arranged continuously longitudinally and laterally, and the isosceles triangle shape is formed to have a bottom side of twice the length of an array pitch of the fuel rods and a height equal to the array pitch of the fuel rods.</p> |
