HTR-PM控制棒组件机械可靠性分析

运用机械可靠性理论，利用力学仿真分析高温气冷堆示范工程——球床模块式高温气冷堆核电站（HTR-PM）控制棒组件的受力情况和薄弱区，识别出其薄弱区位于控制棒组件连接头位置；基于概率断裂力学的可靠度-寿命计算方法，结合辐照对疲劳寿命模型的影响，并考虑所受应力情况，建立可靠度-寿命模型，计算HTR-PM控制棒组件在辐照减弱系数为0.7时的可靠度-寿命。计算结果表明，可靠度水平为0.99时，HTR-PM控制棒组件寿命约为15万次动作循环，辐照对控制棒组件寿命影响较大。本研究可为HTR-PM控制棒组件设备可靠性管理提供参考。 

Mechanical Reliability Analysis of Control Rod Assembly for HTR-PM

The article analyzes the forces and weaknesses of the control rod assembly in the high temperature gas cooled reactor (HTGR) demonstration project-pebble bed modular HTGR plant (HTR-PM), using the the mechanical reliability theory and mechanical simulation, and identifies the weaknesses at the connection of the control rod assembly. In the reliability-life calculation method based on the probabilistic fracture mechanics, in combination with the influence of irradiation on the fatigue life model and in consideration of the stress, the authors establish the reliability-life model to calculate the reliability-life of HTR-PM control rod assembly at the irradiation attenuation coefficient of 0.7. The calculation results show that at the reliability level of 0.99, the life of HTR-PM control rod assembly is about 150,000 action cycles, and that the irradiation has a great influence on the life of the control rod assembly. In view of what mentioned above, this paper can provide reference for the equipment reliability management of the HTR-PM control rod assembly.