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This thesis, “Simulation of CABRI loss-of-flow experiments with the TRACE/FRED codes”, is a
result of cooperation with IRSN (France), who transferred to PSI the CABRI facility
specification and test data. The thesis has mainly two aims: reaching a further validation of the
TRACE code for two-phase sodium, currently being performed at Paul Scherrer Institut, and
analyzing the fuel behaviour during the transients with the FRED code. The calculations were
using coupled TRACE and FRED in frames of the FAST code system.
A pure loss-of-flow transient (LOF) and two LOFs followed by transient overpower (TOP) were
simulated. Several correlations for critical heat flux (CHF) and post dry-out heat transfer
coefficient were implemented and tested in order to achieve a suitable initial model for these
phenomena. It was the very first step towards sodium dry-out modelling in the modified version
Both thermal-hydraulic and fuel thermal-mechanics results were compared with those provided
by the CABRI Project report, and even some benchmarking against other codes was performed.
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