ABSTRACT
The extensive use of passive safety systems in advanced reactors design makes necessary an exhaustive and proper approach to their reliability assessment. This imply not only the consideration of mechanical components, evaluated through classical risk assessment tools (e.g. Failure Mode and Effects Analysis, Fault Tree Analysis, Hazop, etc.), but also the consideration of the associated Thermal Hydraulic (TH) phenomena in terms of the deviation from expected system behavior due to alterations in the environmental conditions.
