为了将有限的资源合理地应用到核电厂设备管理工作中，提高设备的可靠性和可用性，降低设备检修工作量和成本，使电厂机组能够安全、可靠、经济地运行，有必要对设备进行可靠性分级管理。针对示范快堆工程建设期间的工作特点和挑战，研究并形成了适用的、可行的设备可靠性规范化分级新方法与流程。本文研究分析了其与已有方法的不同与特点，提出了新方法实施的工作流程，并以示范快堆两个实例系统为对象进行了应用说明。实践证明了该新方法的高效、合理与有效性，为后续处于建设阶段的同类堆型开展可靠性分级工作提供了方法与经验。

It is essential to perform equipment reliability classification in order to devote limited resources to NPP equipment management reasonably, improve equipment reliability and availability while reducing maintenance workload and cost, and enable NPP's safe, reliable, and economical operation. In light of engineering characteristics of the demonstration fast reactor and the challenges during the construction, an attainable new method was developed to standardize the process of equipment reliability classification and complete the classification of all systems. The differences and characteristics among the methods were compared, the implementation process of the new method was proposed and demonstrated with two real systems. The application shows that the proposed method is efficient, effective and rational, hence can offer to assist other NPPs of similar reactors to implement reliability classification during NPP construction.