This publication describes a Co-ordinated Research Project about the various event investigation methodologies suitable for use by nuclear power plant operators and regulatory bodies. The investigation of methodologies is divided into three main topics: to identify the characteristics of methodologies suitable for the investigation of safety events; to conduct a review of the methodologies available to the research participants for the analysis of event root causes; and finally to examine the effectiveness of operating experience feedback from safety events that had occurred at plants and had been subject to formal investigation.
