Risk-informed safety classification of structures, systems and components (SSCs) is very important for ensuring the safety and economic efficiency of nuclear power plants (NPPs). However, previous methods for safety classification of SSCs do not take the plant operating modes or the operational process of SSCs into consideration, thus cannot concentrate on the safety and economic efficiency accurately. In this contribution, a new method for safety classification of SSCs based on the categorization of plant operating modes is proposed, which considers the NPPs operating history to improve the economic efficiencies while maintaining the safety. According to the time duration of plant configurations in plant operating modes, average importances of SSCs are accessed for an NPP considering the operational process, and then safety classification of SSCs is performed for plant operating modes. The correctness and effectiveness of the proposed method is demonstrated by application in an NPP's safety classification of SSCs.

结构、系统和部件 (SSC) 的风险知情安全分类对于确保核电厂 (NPP) 的安全和经济效率非常重要。然而，以往的SSCs安全分类方法没有考虑SSCs的工厂运行模式或运行过程，因此不能准确地集中在安全性和经济效益上。在本文中，提出了一种基于电厂运行模式分类的 SSC 安全分类新方法，该方法考虑了 NPP 的运行历史，以在保持安全的同时提高经济效率。根据电厂运行模式下电厂配置的持续时间，考虑到运行过程，可以获得核电站的 SSC 的平均重要性，然后对工厂运行模式进行SSC的安全分类。该方法的正确性和有效性通过在核电厂SSCs安全分类中的应用得到证明。