Examples of Unsafe Act Identification from Simulator Training Records for Interfacing System Loss of Coolant Accident

Operating procedures such as EOPs (Emergency Operating Procedures) and AOPs (Abnormal Operating Procedures) have been developed to maximize the operator's performance during emergency/abnormal situations of critical-safety systems. In this regard, it is very important to point out that one of the significant factors causing accidents or incidents is an inappropriate human performance of operating personnel working in the socio-technical systems. A lot of efforts to collect HRA data by using a simulator of NPP have progressed. We developed a standardized guideline to specify how to gather HRA data from simulator training records, and created IGT (Information Gathering Template) specifying what kinds of measures should be observed during the simulations and defined UA (Unsafe Act) and describe the UA identification method under interactions between crew members to suggest a practical UA type classification scheme under a procedure driven operation. We also developed a framework for data collection and analysis to produce HEPs. The framework is named HuREX (Human Reliability data Extraction) system. In this paper, we described a process to identify UAs as well as UA candidates during an AOP/EOP operation with simulator training records. We presented examples of UA candidates and UAs grouped by consequences based on UA identification criteria. Based on this research, we are to achieve insights about the UA pattern and procedure instruction in which UAs occurred frequently. With this result, we are to analyze the root cause of UAs to find a way to reduce UAs