| 摘要 |
A fuel assembly for a light-water or heavy-water reactor or for a fast reactor comprises a bundle of clad fuel pins disposed on a uniform lattice and maintained in parallel relation by means of separate spacer grids fitted with resilient members for applying the grids against the fuel pins. A rigid support structure is formed by two parallel end-plates braced by tie-rods having the same diameter as the fuel pins and disposed at uniform intervals at the lattice nodes. The fuel-pin bundle is associated with a single support grid rigidly fixed at the mid-point of the tie-rods, the other grids being uniformly spaced in the vertical direction on each side so that elongation of the fuel pins takes place upwards and downwards from the support grid.
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