核动力船舶燃料组件瞬态动力学分析

针对核动力船舶燃料组件在船体运动状态下的结构安全问题，以海洋核动力平台为例，采用水动力学对平台进行频时域计算，得到船体重心的六自由度运动时历曲线。基于远程位移方法将船体运动传递到反应堆，实现对燃料组件随船体运动的数值模拟，并采用瞬态动力学对燃料组件的结构载荷进行计算。计算结果表明，与船体静止状态下相比，燃料组件的结构载荷在船体运动状态下明显增大。因此，在对燃料组件进行结构安全分析时，必须考虑船体的随机运动响应。 

Transient Structural Analysis of Fuel Assembly for Nuclear Powered Ships

In order to analyze the structural safety of fuel assembly for nuclear powered ships in moving state, taking the marine nuclear power platform as an example, hydrodynamics is adopted to conduct the frequency and time domain calculation for the platform to obtain the time serial curves of the center of the gravity in six degrees of freedom. Remote displacement method is used to transfer the ship motions to the reactor to realize the numerical simulation of fuel assembly moving with the ship, and transient structural mechanics is adopted to calculate the structural loads of fuel assembly finally. Results show that the structural loads of fuel assembly increase obviously in ship moving state compared with that in static state. Therefore, it is quite essential to take the ship random motion response into account during the structural safety analysis of fuel assembly.