Human Reliability Analysis in Frame of Probabilistic Safety Assessment Projects in Czech Republic

Human reliability analysis has proved to be a very important part of probabilistic safety analysis all over the world. It has been also an integral part of both Probabilistic Safety Level-1 studies developed in Czech Republic - Nuclear Power Plant Dukovany Probabilistic Safety Assessment and Nuclear Power Plant Temelin Probabilistic Safety Assessment and most of their consequent applications. The methodology used in human reliability analysis in frame of these studies is described in the first part of the paper. In general, the methodology is based on the well-known and most frequently used methods Technique for Human Error Rate Prediction and ASEP. The up-to-date decision tree method is used to address procedure-driven operator's interventions during plant response to initiating event. Some interesting results of human reliability analysis performed for Nuclear Power Plant Dukovany are described in the second part of the paper. The recommendations resulting from the analysis led to the standardization of some, up to that time, non-standard operator's actions and to the development of procedures for them. Generally, the procedures were found to be deficient from several points of view, what contributed to the decision to develop quite new emergency procedures for Nuclear Power Plant Dukovany. The human reliability analysis projects going on or planned for the very next future are described in the final part of the paper. safety analysis; risk assessment; reliability; nuclear power plants; human factors; errors; Czech Republic; operators; emergencies;