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固态钍基熔盐堆(Thorium-based Molten Salt Reactor with Solid Fuel,TMSR-SF)是第四代核反应堆堆型之一,它融合了高温气冷堆的石墨基质包覆颗粒燃料球技术和熔盐堆的高温熔盐冷却剂技术。堆芯的物理设计和几何设计依赖于燃料球在堆芯中的堆积因子,为研究球床堆堆芯模型内燃料球的堆积三维结构,本文提出基于折射率匹配的方法对球床进行三维重构的方案,并通过初步的模拟实验对程序进行验证,旨在探索该方法在球床三维重构中的可行性。针对三维重构中的一系列关键问题进行阐释,并提出相应的解决方案;同时给出了三维重构方案的完整流程,并计算出了衡量三维重构精确度的度量值:直径重叠量。最后,搭建了一个小型规则排布的球床实验装置,通过折射率匹配技术开展球床可视化实验以探索该方案在球床三维重构中的精确度,并说明该方法的可行性。试验结果表明,颗粒间平均重叠量为1.43 mm,重构精度有待提高,重构方法有待改进。
Thorium-based Molten Salt Reactor with Solid Fuel (TMSR-SF) is one of the fourth generation nuclear reactors. It incorporates graphite substrate-coated pellet technology and molten salt Pile of high temperature molten salt coolant technology. The physical design and geometrical design of the core depend on the accumulation factor of the fuel pellet in the core. To study the three-dimensional structure of the fuel pellet in the core model of the pellet bed reactor, a three-dimensional The scheme is verified by a preliminary simulation experiment to explore the feasibility of this method in the 3D reconstruction of a ball bed. A series of key problems in 3D reconstruction are explained and corresponding solutions are proposed. At the same time, a complete flow of 3D reconstruction scheme is given and a measure of the accuracy of 3D reconstruction is calculated. Finally, a small regularly arranged ball bed experimental setup was set up. The ball bed visualization experiment was carried out by index matching to explore the accuracy of this scheme in the three-dimensional reconstruction of the ball bed and the feasibility of the method. The experimental results show that the average overlap between particles is 1.43 mm, the reconstruction accuracy needs to be improved, and the reconstruction method needs to be improved.