核反应堆驱动机构外套筒对整机抗震性能的影响

发布时间：2018-04-03 05:26

  本文选题：安全棒　切入点：驱动机构　出处：《工程科学与技术》2017年S1期

【摘要】：安全棒驱动机构是核反应堆的重要组成部分,其抗震性能是反应堆安全性评价中的重要指标。在设计初期预知地震载荷下的应力分布情况有助于提高该机构的高抗震性能。针对某型安全棒驱动机构的设计特征,建立一种基于反应谱原理的驱动机构外套筒抗震性能分析模型。基于国内外相关抗震设计标准确定地震反应谱,通过分析实际工况的载荷分布情况,确定模型的边界条件;通过对驱动机构整机、单独内部机构与外套筒3种模型的分析计算,获得了相同载荷及边界条件下的3种模型各自的应力分布。再根据3种模型的特点创建具有代表性的节点路径,通过提取路径上的应力分布并进行对比,清楚反映出该3种不同模型的应力分布情况,研究了外套筒对控制棒驱动机构抗震性能的影响。分析结果表明外套筒的结构参数直接决定驱动机构整机的抗震性能,外套筒可有效减小内部机构在地震载荷作用下产生的应力,整机外套筒上应力分布情况与整机内部机构应力分布情况基本一致,单独的外套筒与整机的外套筒应力分布趋势一致。这种分析技术可用于在结构设计初期对驱动机构抗震性能设计是否合理进行核算评价。这样可以有效提高设计效率,降低地震载荷带来的风险。
[Abstract]:Safety rod drive mechanism is an important part of nuclear reactor, and its seismic performance is an important index in reactor safety evaluation.The prediction of the stress distribution under the earthquake load at the early stage of design is helpful to improve the high seismic performance of the mechanism.According to the design characteristics of a kind of safety rod drive mechanism, a seismic performance analysis model of the outer sleeve of the drive mechanism based on the principle of response spectrum is established.The seismic response spectrum is determined based on the relevant seismic design standards at home and abroad, the boundary conditions of the model are determined by analyzing the load distribution of actual working conditions, and the analysis and calculation of three models of driving mechanism, single internal mechanism and outer sleeve are carried out.The stress distributions of the three models under the same load and boundary conditions are obtained.Then, according to the characteristics of the three models, the representative node paths are created, and the stress distribution of the three models is clearly reflected by extracting and comparing the stress distribution on the paths.The effect of outer sleeve on seismic performance of control rod driven mechanism is studied.The results show that the structural parameters of the outer sleeve directly determine the seismic performance of the driving mechanism, and the outer sleeve can effectively reduce the stress generated by the internal mechanism under the earthquake load.The stress distribution on the outer sleeve of the whole machine is basically consistent with the stress distribution inside the whole machine, and the stress distribution trend of the single outer sleeve is the same as that of the whole machine.This analysis technique can be used to evaluate whether the aseismic performance design of drive mechanism is reasonable at the early stage of structural design.In this way, the design efficiency can be improved effectively and the risk caused by earthquake load can be reduced.
【作者单位】： 四川大学制造科学与工程学院;西南交通大学交通运输与物流学院;
【基金】：国家科技支撑计划资助项目(2015BAF27B01) 四川省科技计划资助项目(2014GZ0128)
【分类号】：TL364
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本文编号：1703839