Applications of SYS TH codes to nuclear reactor design and accident analysis - Chapter 15

Envisaged Nuclear Power Plant transient performances are translated via experiments and expert judgement into lists of accidents. Accident scenarios are at the origin of phenomena. Phenomena are characterized by parameters or variables. The parameter values can be translated into requirements for predictive capabilities in thermal-hydraulics. The safety acceptance criteria consist of threshold parameter values. These are established by logical processes typically independent upon thermal-hydraulics knowledge. A global vision of nuclear reactor thermal-hydraulics is provided in the chapter from the side of phenomena and accident scenarios: 12 reactor types are considered for the characterization of 47 accident scenarios cross-linked with 113 phenomena and 15 sets of “homogeneous” variable time trends.