安全停堆地震载荷下核安全级轴流风机抗震计算

Stress Calculation of Nuclear Safety-GradeFan Under Safety Shutdown Earthquake

利用Workbench软件分析了核安全级轴流风机的抗震性能,计算了风机的固有频率及安全停堆地震载荷下的应力,并根据ASME标准应力评价规范,计算及线性化评定了事故工况下,风机危险点处由组合载荷造成的应力,得到了风机整体的变形量。结果表明,风机为柔性设备,整体固有频率为25 Hz,其筒体、叶轮及轮毂等关键部件的应力分布均未超过应力阈值,总体变形量未超过装配限值,说明风机符合设计规范,能够满足工况要求。

In this paper,the seismic performances of a nuclear safety-grade fan,including the natural frequency and the stress under the load of safety shutdown earthquake(SSE),are analyzed by using the Workbench software.And according to the standard stress assessment specification of the ASME,the stress at the dangerous point of the fan under combined loads in accident conditions is calculated and linearly evaluated,and the deformation of the fan is obtained.The results show that the total natural frequency of the fan is 25 Hz,and the stress distribution of the key components such as flexible equipment,fan barrel,impeller,and wheel hub has not exceeded the stress threshold that the fan can bear,and the total deformation of the fan has not exceeded the assembly limit,that is,the fan conforms to the design specifications and meets the requirements of the working conditions.