Topaz型空间堆安全棒紧急复位动力学分析  

Dynamic Analysis of Emergency Reset of Topaz Type Space Nuclear Reactor Safety Rod

作　　者：李经纬 刘世航 张冠华 姚成志[1] 彭朝晖[1] 郭志家[1] LI Jingwei;LIU Shihang;ZHANG Guanhua;YAO Chengzhi;PENG Zhaohui;GUO Zhijia(Department of Nuclear Engineering Design,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院核工程设计研究所,北京102413

出　　处：《原子能科学技术》2024年第5期1092-1100,共9页Atomic Energy Science and Technology

摘　　要：安全棒系统是Topaz型空间堆中反应性控制与核安全保护的执行机构。Topaz型空间堆在外太空轨道运行时由于堆芯温度场分布不均,反应堆内安全棒导向管因热膨胀会产生一定的径向变形。在需要紧急停堆时,安全棒紧急复位过程中受到与弯曲导向管碰撞而产生的摩擦阻力影响。本文针对导向管的径向变形量超过其与安全棒的最小间隙时,落棒时间与摩擦阻力的变化情况进行研究。基于三维多体动力学模拟软件建立了安全棒系统的动力学模型,通过精确模拟摩擦碰撞过程并合理处理刚柔耦合问题,计算分析了导向管径向变形量对安全棒紧急复位的影响。模拟结果表明,导向管径向变形量与安全棒复位时间及所受摩擦阻力均呈正相关关系。The safety rod system is the actuator for reactivity control and nuclear safety protection in Topaz type space nuclear reactors.Due to the uneven distribution of reactor core temperature field during the operation of a Topaz type space nuclear reactor in outer space orbit,the thermal expansion of the safety rod guide tube inside the nuclear reactor will cause certain radial deformation.When needs to stop the reactivity of nuclear reactor,the safety rod is affected by frictional resistance caused by collision with the bent guide tube during the emergency reset process.In the rod drop study for pressurized water reactor(PWR)control rods,the guide tubes are bent radially due to seismic and thermal loads,and even the shape of guide tube become“C”or“S”under different loads.How different shapes of guide tubes affect control rod drop is a variable studied by many researchers.In space nuclear reactors,only the effect of heat load on the guide tube needs to be considered,and the safety rod cannot rely on gravity,but is ejected into the reactor through the drive mechanism.In this paper,the changes in rod drop time and frictional resistance when the radial deformation of the guide tube exceeds its minimum clearance with the safety rod were researched.The radial deformation of the guide tube caused by the temperature field calculation results was taken as the input variable of the simulation analysis.A dynamic model of the safety rod system was established based on three-dimensional multi body dynamics simulation software.By accurately simulating the friction collision process and reasonably handling the rigid flexible coupling problem,the influence of radial deformation of the guide tube on the emergency reset of the safety rod was calculated and analyzed.It can be found that when the radial deformation of the guide tube exceeds 0.16 mm,the parameter sensitivity of the studied variable increases.At the same time,the variation of friction value is more complex and the contact collision is more violent.Through the sim

关 键 词：空间核反应堆 安全棒 动力学分析 

分 类 号：TL351.5[核科学技术—核技术及应用]