Operating Events in Chinese Nuclear Power Plants: A Preliminary Analysis

Operating event reporting is important for continuously improving the safety level of nuclear power plants (NPPs). This paper presents the preliminary analysis results based on the data of the licensee operating events (LOEs) occurred in Chinese NPPs during 1991–2015. A total of 805 LOEs were collected. Trends of the number of LOEs and reactor units are presented. It is found that the number of LOEs per unit declined gradually. There were 50% of all LOEs related to human factors and 48% related to equipment factors. More than 50% of human-related LOEs were associated with Personal Work Practices and Written Procedures and Documents. The differences in operating events between conventional and advanced NPPs were analyzed. These results and lessons learned from these LOEs will be helpful for operator error prevention and human reliability analysis in NPPs.