摘要
The dry storage system (DSS) is the most popular method for the interim storage of spent nuclear fuels (SNFs). The internal environment with high humidity and radiation would induce radiolysis and recombination, degrading the internal components and SNFs within the DSS during the storage period. A three-dimensional (3-D) transient heat transfer methodology is developed to model the hydrated residual water in drying process for the DSS. Effects of thermal loading and fuel burnup on SNF temperature and residual water are also considered. Based on the comparison, effects of burnup on the SNF temperature and the drying ratio are insignificant. More hydrated water is retained on the fuel surface for the lower thermal loading. Present simulation results strongly recommend that the lower thermal loading should be used to evaluate the drying process in order to avoid the unexpected residual water retained on the fuel surface in any one DSS.