Study of Analysis and Evaluation for Human Actions with the Potential to Postulate Initiating Events in Nuclear Power Plants

This paper studies the method about analysis and evaluation for human actions with the potential to postulate initiating events which are regarded as Type B human actions in nuclear power plants. It develops a useful and effective flow diagram in the analysis and assessment of human actions with potential initiating events. It mainly includes the selection of scenarios, qualitative analysis and quantitative analysis. Through the detailed analysis, key steps of human actions could be picked out and the human error probability of the task could be calculated. The influence of the human actions for the whole task could be assessed. As an effective method of human reliability analysis, it provides a systematic assessment method for analyzing human error in the tasks and contributes for the overall safety of the nuclear plants. Besides, fuel mis-loading was chosen as a typical Type B human actions activity to be analyzed and assessed by this method.