Spent nuclear fuel, which can degrade during long-term storage, must be transported intact in normal transport conditions. In this regard, many studies, including those involving Multi-Modal Transportation Test (MMTT) campaigns, have been conducted. In order to transport the spent fuel safely, a tie-down structure for supporting and transporting a cask containing the spent fuel is essential. To ensure its structural integrity, a method for finding an optimum conceptual design for the tie-down structure is presented. An optimized transportation test model of a tie-down structure for the KORAD-21 metal cask is derived based on the proposed optimization approach, and the transportation test model is manufactured by redesigning the optimized model to enable its producibility. The topology optimization approach presented in this paper can be used to obtain optimum conceptual designs of tie-down structures developed in the future.

在长期储存期间会降解的乏核燃料必须在正常运输条件下完好无损地运输。在这方面，已经进行了许多研究，包括涉及多模式运输测试 (MMTT) 活动的研究。为了安全运输乏燃料，用于支撑和运输装有乏燃料的容器的系紧结构是必不可少的。为确保其结构完整性，提出了一种为系留结构寻找最佳概念设计的方法。基于所提出的优化方法，推导出了KORAD-21金属桶栓系结构的优化运输测试模型，并通过重新设计优化模型以使其具有可生产性来制造运输测试模型。