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在球床式高温气冷堆(PB-HTGR)中,球形燃料元件在堆芯中的流动特性是堆芯物理设计和几何设计的基础,球流运动规律的研究在发展球床式高温气冷堆技术中具有基础性的作用。目前还没有一种有效的手段检测燃料球在堆芯中的运动轨迹,有关球流运动规律的理论和实验研究尚不够完善。为了对燃料球在堆芯中的运动规律进行三维实验研究,清华大学核研院按实际堆芯结构等比例缩小设计了实验模型,通过检测目标球在模型中的运动轨迹,可以对不同工况下燃料球的运动规律进行模拟研究。为了满足目标球的检测要求,我们设计了钴-60多层螺旋CT检测方案,可以进行目标球的识别和轨迹追踪,验证实验结果表明该方案可以满足实验系统对目标球检测的要求。
In the ball bed HTR (PB-HTGR), the flow characteristics of the spherical fuel elements in the core are the basis of the physical design and geometric design of the core. The study on the rule of ball flow in the development of ball bed high temperature air-cooled Heap technology has a fundamental role. At present, there is no effective way to detect the trajectory of the fuel ball in the core. The theoretical and experimental studies on the law of the movement of the ball are not yet perfect. In order to conduct a three-dimensional experimental study on the law of motion of a fuel pellet in a core, an experimental model was designed according to the actual core structure scale reduction by the Nuclear Research Institute of Tsinghua University. By detecting the trajectory of the target ball in the model, Under the law of fuel ball motion simulation study. In order to meet the testing requirements of the target ball, we designed the Cobalt-60 multi-slice spiral CT detection scheme, which can identify the target ball and track the trajectory. The experimental results show that this scheme can meet the requirements of the experimental system for the target ball detection.