在钠冷快增殖堆的中间热交换器(IHX)设计时,必须要考虑流致振动的影响。流致振动分析主要包括3部分内容:(管束的)固有频率计算、流体的激发频率以及振动判据与振动影响计算。由于管束结构和支撑的特殊性,现有的计算方法和标准规范不能直接使用。本文以钠冷快增殖堆的IHX管束结构及支 In the design of an intermediate heat exchanger (IHX) for sodium-cooled breeders, the effect of flow induced vibration must be considered. Flow-induced vibration analysis includes three parts: (natural) frequency of tube bundle, excitation frequency of fluid, vibration criterion and vibration influence calculation. Due to the particularities of tube bundle structure and support, the existing calculation methods and standards can not be used directly. In this paper, fast cooling reactor sodium IHX bundle structure and branch