THYC: a 3D thermalhydraulic code for pressurized water reactors and heats exchanges

The three dimensional thermohydraulic THYC code has been developed at EDF (France) in order to study the behavior of reactor cores and heat exchangers under normal and accidental operating conditions. THYC is designed to simulate 3D single or two-phases flows in tube or rod bundles. It has already been used for accidental transient simulations, evaluation of new fuels assemblies, determination of efficiency of steam generators and condensers. A coupling with COCCINELLE code (3D neutronic core code) and with CATHARE code (thermohydraulic of primary and secondary circuits) allows a more precise simulation of transients such as steam pies failures. (A.B.). 16 figs