In a nuclear fuel reprocess plant (NFRP), the operating environment features complex working conditions and a large number of open operation processes. When using a robotic arm for operation, a sight window is required to directly observe the operation process. To ensure the safety of staff and extend the service life of the sight window, it is necessary to carry out optimization analysis on the material selection of the sight window. Based on the source term characteristics of deep burn-up spent fuel assemblies in typical nuclear power plants, analytical research on the material selection models of sight windows was conducted, computational simulations was established through the Monte Carlo method program, the shielding performance of different sight window glass combination was analyzed, and their service life was assessed. By analyzing the shielding performance and radiation resistance of sight windows with different glass permutation and combination, a material selection and layout scheme for sight windows that can be used for a long time in high-radiation areas of hot cells was proposed. Considering the complex radiation environment caused by high-radiation operations in hot cells, for the materials of sight windows, glasses with strong irradiation stability should be placed as close to the hot cell side as possible, and the number of such glass layers should be increased as much as possible. In this way, the overall service life of the sight window can be significantly extended, and the frequency of personnel entering the radiation area to replace the window panel during its service life can be reduced, thus greatly lowering the collective radiation dose.
Key words
sight window /
shielding performance evaluation /
performance analysis for different permutation and combination
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