摘要
我国自主设计的第3代核电站安全壳外挂水箱用于超设计基准事故下内层安全壳的长期排热,这是确保安全壳完整、核电厂安全的重要设施。因此,有必要对外挂水箱在极限安全地震动与温度异常工况组合作用下的结构强度进行分析。建立带有外挂水箱的外层安全壳有限元模型,开展网格敏感性分析,并通过模态分析研究结构的振动特性。采用时程分析法,对结构同时施加温度和地震动载荷,基于流固耦合方法分析水体与结构的相互作用,研究外挂水箱结构的地震动响应以及水箱内水体振荡特性。研究表明,水体在水箱凹沉处水面振荡幅度较大,在EL Centro地震动、人工合成地震动和长周期地震动工况下外挂水箱的最大拉应变和最大压应变绝对值均小于C60混凝土许用应变值。
Containment external water tank is used for long-term heat removal from the inner containment at beyond design basis accidents for China-designed third-generation nuclear power plant.It is a critical facility to ensure the integrity of the containment and the safety of nuclear power plants.Therefore,it is necessary to analyze the structural strength of the external water tank under the load of the extreme safety ground motion combined with abnormal temperature operating conditions.In this paper,the finite element model of the outer containment with external water tank was established,grid sensitivity analysis was conducted,and the structural vibration characteristics were analyzed through the modal analysis.The time history analysis method was used,and the structure was under the load of temperature and earthquake.The fluid-structure interaction method was used to simulate the interaction between the fluid and the structure,analyze the seismic response of the external tank structure and fluid oscillation.The result shows that the fluid oscillates strongly on the water surface at the lower position of the external tank,and the absolute values of the maximum tensile strain and the maximum compressive strain of the external water tank in three cases of the EL Centro seismic,the synthetic seismic and the long-period seismic are less than the allowable values of the C60 concrete.
作者
汪孝凡
曹学武
WANG Xiaofan;CAO Xuewu(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2021年第3期494-502,共9页
Atomic Energy Science and Technology
基金
国家科技重大专项资助项目(2019ZX06004013)。
关键词
外挂水箱
时程分析
流固耦合
强度分析
external water tank
time-history analysis
fluid-structure interaction
strength analysis
