Abstract
A novel LiF, Sm2O3, Gd2O3/carbon fibre/polyimide material was designed in order to improve the neutron absorbing performance of the spent fuel storage basket in this paper. The volume fraction of three kinds of neutron absorbers (LiF, Sm2O3and Gd2O3) in polyimide was optimised by Monte Carlo method. Calculation results showed that the novel neutron-absorbing material, in which the volume ratio of LiF, Sm2O3and Gd2O3 was 1:2:13, can achieve the best absorption capacity. Based on the calculated results, the basket material was fabricated by compression moulding, and its mechanical behaviour, thermal behaviour, and irradiation resistant behaviour were evaluated, respectively. The experimental results proved that the tensile strength of the novel neutron-absorbing material was between 195 and 346MPa and the maximum service temperature was up to 300°C. Gamma irradiation dose was limited to 160kGy, the bending strength of the material kept increasing from 10 to 19MPa.
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