The Chernobyl accident : a challenge on PSA as a tool for the prediction of event scenarios beyond the design basis and for safety improvements

Probabilistic Safety Assessments (PSAs) are an unwaivable tool for analysis and valuation of system behavior in various technologies today. In this paper the state-of-the-art and the key elements of this tool are summarized. The main course and the operator violations at the Chernobyl accident are described briefly and from that conclusions for PSAs are drawn