目的 为防止放射性物质泄漏，要求乏燃料运输容器在事故工况下保证容器的密封。通过对乏燃料运输容器比例容器事故工况密封分析研究，为乏燃料运输容器密封分析提供依据。方法 为验证假想事故工况乏燃料运输容器的密封性，采用LS-DYNA分析软件，开展乏燃料运输容器比例容器9 m跌落分析，提取密封螺栓跌落过程中的载荷时程和密封面分离量，并在比例容器跌落试验后开展气密性能试验。结果 跌落分析结果表明，比例容器内、外盖在跌落过程中，密封螺栓应力满足限值要求;内、外盖密封面最大分离量小于密封结构有效回弹量。同时跌落后容器的气密性检查试验结果表明其密封性能良好。结论 乏燃料运输容器比例容器的跌落密封分析和气密性试验结果表明，在事故工况下乏燃料运输容器货包能够保证密封要求，该分析方法可用于乏燃料运输容器事故工况的密封分析。

The work aims to seal the spent fuel transportation cask under accident conditions in order to prevent the leakage of radioactivity materials and provide basis for the sealing analysis of the spent fuel transportation through the analysis and research on sealing of scale model of the spent fuel transportation cask under the accident conditions. To verify the sealing performance of the spent fuel transportation cask under hypothetical accident conditions, the 9 m drop analysis was carried out to the scale model of the spent fuel transportation cask under accident conditions by the LS-DYNA computer program. Then, the load history of sealing bolts and the separation of sealing surface during the drop process were extracted. Meanwhile, the sealing capability test was carried out after the drop test. The results of drop analysis indicated that the stress of the sealing bolts met the limit requirements during the drop process of inner and outer covers of scale model, and the maximum separation of sealing surfaces of inner and outer covers was less than the effective rebound of sealing structure. The air tightness test conducted after the drop test showed that the sealing performance was good. According to the results of drop sealing analysis and the air tightness test of scale model of spent fuel transportation cask, the spent fuel transportation cask can meet the sealing requirements under accident conditions and the method can be used for the sealing analysis of the spent fuel transportation cask under accident conditions.