| 摘要 |
A compact rack for storing used nuclear fuel assemblies with a high and uniform neutron absorption and a high corrosion resistance, which comprises a plurality of unit square cylinders 1 for encasing used nuclear fuel assemblies. To minimise the space occupied by the rack, the rack comprises unit square cylinders each consisting of an inner cylinder 1, and strips 2 of neutron absorber material wound up around this inner cylinder and unit square cylinders each consisting of only an inner cylinder, the wound cylinders and the non-wound cylinders being arranged alternately in both lateral and longitudinal directions. Alternatively the unit square cylinders each comprise an inner cylinder 1 and thin strips 2 of neutron absorber material overlaid at least one pair of opposite outer sides of the inner cylinder, with the overlaid sides of one square cylinder facing the unoverlaid sides of another square cylinder, or the unit square cylinders each have a thin strip of neutron absorber material at one side and are so arranged that these thin strips surround each of the inner cylinders. Preferably the neutron absorber material is a nickel-based substantially amorphous alloy containing 10-30% by atom of B, 5.25% by atom of Cr and 1-15% by atom of P and at least 30% by atom of Ni and having a pitting corrosion potential of at least 0.9 V.
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