【摘要】 压水堆核电厂中，燃料棒流致振动磨损是燃料棒失效最主要的原因，对核电厂运行经济性、安全性有重要影响。建立一种能够合理表征燃料棒动力学特性的振动模型，是开展燃料棒流致振动磨损分析方法研究的基础。以压水堆燃料组件单根燃料棒为研究对象，考虑寿期末格架对燃料棒失去夹持作用、多跨支撑等影响因素，建立燃料棒有限元分析模型，研究寿期末效应对燃料棒振动特性的影响规律。为了验证模型，在模拟寿期末燃料组件骨架中开展全尺寸燃料棒振动特性测量试验，获得格架松弛条件下燃料棒振动响应。从分析和试验结果可以看出，建立的燃料棒振动模型能够很好地表征其振动特性。该模型后续可以用于指导核燃料组件的设计分析。更多还原

【Abstract】 In pressurized water reactor(PWR) nuclear power plants, grid to rod fretting wear is the main cause of fuel rod failure, which has an important impact on the operating economy and safety of nuclear power plants. Establishing a vibration model that can reasonably characterize the dynamic characteristics of fuel rods is the basis of the research of the analysis method of grid to rod fretting wear. Taking a single fuel rod of PWR fuel assembly as the research object, the finite element analysis model of the fuel rod was established considering the influence factors such as the loss of clamping effect of the grid to the fuel rod at the end of the grid life and multi-span support. And the influence rules of the life end effect on the vibration characteristics of the fuel rod were studied. In order to verify the model, a full-scale vibration characteristic measurement experiment of the fuel rod was carried out in the fuel assembly skeleton at the simulated end of the grid life, and the vibration response of the fuel rod under the relaxed condition of the grid was obtained. From the analysis and test results,it can be seen that the established vibration model of fuel rod can well characterize its vibration characteristics. The model can provide a guidance for the design and analysis of nuclear fuel assembly.更多还原