This paper describes the development and current structure of the Idaho National Laboratory's (INL's) Human Event Repository and Analysis (HERA) system. HERA is a database, worksheet, and related process system for obtaining, compiling, and classifying information from operational experience in nuclear power plants (NPPs) and making that information available in content and form useful to the variety of human reliability analysis (HRA) methods and the human factors discipline in practice.

The weakness of data available for HRA is one of the biggest concerns expressed by practitioners and decision makers. The validity of quantification of human failure event (HFE) probabilities and...