【摘要】 清华大学 20MW实验研究堆采用流行的紧凑堆芯设计模式，其堆内构件包括内外支撑筒、承重板、重水箱、堆芯组件等部分。此项研究采用板壳、梁、杆等有限元单元的组合模型对堆内构件进行简化，建立了一个反映其结构特性的有限元整体模型；然后对其进行模态分析、响应谱分析以求得结构的模态参数和实际的厂区地震载荷下的最大响应；最后按照应力响应情况，评定了堆内构件结构设计的合理性。分析结果证明，在地震工况下，堆体结构的应力、位移响应满足安全要求。更多还原

【Abstract】 ： The Tsinghua 20MW Research Reactor (THRR- 20) is a pool- type reactor with a compact core design.The internals include a heavy water tank,a support plate,an inner support cylinder and an outer support cylinder as well as the core.A 3D finite element model that includes consider both the spatial arrangement and the reactor component shape was developed for a modal analysis and response spectrum analysis to calculate the modal results and the response stresses,displacements,etc.for a seismic load.The analysis results indicate that the reactor internals have enough strength for seismic loads.The stresses and displacements satisfy the reactor safety requirement.更多还原