【摘要】 国际原子能机构（International Atomic Energy Agency，简称IAEA）发布的《Safety Classification of Structures, Systems and Components in Nuclear Power Plants》(No. SSG-30)从安全功能分类和设计预防措施两个维度出发，结合失效后果严重程度、物项类型等因素，为核电厂构筑物、系统和部件（SSCs）的安全分级提供了具有可操作性的方法论框架。本文基于SSG-30，对核电饱和式蒸汽发生器主要零部件的安全分级进行了研究，对其承压边界、内部构件及密封组件等关键部件进行了安全分级探讨，并根据防振条组件和套筒支承板的安全分级开展了力学评估分析。经分析，基于SSG-30的核电蒸汽发生器分级可为核电设备分级和力学评估提供参考，对于核电机组的安全运行水平具有重要的意义。更多还原

【Abstract】 Safety Classification of Structures, Systems and Components in Nuclear Power Plants(No. SSG-30) was issued by the International Atomic Energy Agency(IAEA). Starting from the two dimensions of safety function classification and design provision, the SSG-30 guidelines provide an operational methodological framework for the safety classification of nuclear power plant structures, systems and components(SSCs), combining with factors such as the severity of failure consequences and item types. Based on SSG-30, this paper performs safety classification application research in major components of saturated steam generators in nuclear power plants. It discusses the safety classification of key parts such as the pressure boundary, internal components, and sealing assemblies, and the mechanical evaluation are carried out for the anti-vibration strip assembly and the sleeve support plate. The safety classification of nuclear steam generators following SSG-30 can provide a reference for the classification and mechanical evaluation of nuclear power equipment, and is of great significance for the safe operation level of nuclear power units.更多还原