CFR600堆芯组件自由跌落试验的冲击响应分析

Impact Analysis of Free-drop Test for CFR600 Core Assembly

评估堆芯组件跌落对组件结构完整性和内部元件密封性的影响是组件安全评价的重要组成。本文针对CFR600堆芯组件在换料运输过程中可能发生的组件跌落事件,开展了堆芯组件模拟件堆外冲击力学试验和数值模拟分析。研究对比了组件模拟件分别从不同高度自由跌落的试验和模拟结果,分析了组件在冲击载荷作用下的加速度和应变响应时程,结果表明,应变波形沿组件截面从上到下逐渐由正弦波转变为方波。当跌落高度达到1500mm时,组件管脚位置发生了较大的局部塑性变形,此后跌落高度增加,加速度峰值开始减小。

Evaluating the influence of core assembly drop on the structural integrity and internal rod sealing is an important component of assembly security appraisal.In this paper,the impact test outside the reactor and numerical simulation analysis of analog core assembly were performed for the accidental drops during refueling and transportation.The results of the free-drop test and simulation from different heights were studied and compared for the analog assembly,and the acceleration and strain response time history under impact loading were also analyzed.It was found that the strain waveform gradually changed from a sine wave to a square wave from top to bottom along the assembly section.When the drop height reached 1500mm,a large local plastic deformation occurred in the position of the assembly pin.After that,the drop height increased and the peak acceleration started to decrease.