[en] The International Nuclear and Radiological Event Scale is intended to inform the public about the safety implications of nuclear facility events. Since the establishment of the National Nuclear Safety Administration of China, this scale has been used to grade and assess the events of civilian nuclear facilities. In the field of nuclear power, since the loading of QinShan Nuclear Power Station, the first nuclear power plant in China in 1991, the classification table has been used to grade the operational events occurring in nuclear power plants. With the increase in the number of nuclear power plants operating in China, the number of operational events has gradually increased, and the use of international nuclear and radiological event scales in nuclear power plants has become more frequent and widespread. This paper introduces the development history, scope of application, general description and grading criteria of the international nuclear and radiological event scale, and discusses the application of the scale in the event of nuclear power plants in China, so as to provide reference for the classification of important events in China's nuclear power plants. (authors)