Performance shaping factors (PSFs) are regarded as the causes and contributing factors that affect human errors in nuclear power plants. In order to improve the accuracy of human reliability assessment results, it is necessary to conduct research on the interrelationships among PSFs. This study determined PSFs affecting human errors based on operators’ cognitive process and inductive analysis. Then the decision-making trial and evaluation laboratory (DEMATEL) and Pearson correlation analysis methods were employed to analyze the relative importance and correlation of PSFs in human reliability.

The analysis results showed that there are mainly 10 PSFs affecting human errors in the digital main control room of nuclear power plants. Moreover, according to the causal logical relationships of PSFs, a causality relationship model of human reliability was constructed. This model took into account the causal relationships of PSFs, and it established the relationships between PSFs and human reliability, which was helpful for improving the accuracy of the quantitative assessment of human reliability.