Fast Code System: Review of Recent Applications

The FAST code system, consisting of coupled neutronics (ERANOS and SERPENT), thermal-hydraulic (TRACE) and fuel behaviour (FRED) modules, is currently being developed and used at Paul Scherrer Institut for static and transient analysis of different innovative fast reactors. The paper presents the review of few recent studies in which the FAST code system was used for: 1) validation of static neutronic modeling using data of PHENIX EOL control rod shift test and BFS-62-3A critical test; 2) validation of coupled neutron kinetics and system thermal hydraulics using data of PHENIX EOL natural circulation test; 3) for different fast reactor concepts: comparison of closed fuel cycles; 4) nuclear data uncertainty propagation in dynamic calculations; 5) the SFR core behaviour under unprotected loss-of-flow conditions. (author)