The CATHARE (Code for Analysis of Thermalhydraulics during an Accident of Reactor and Safety Evaluation) code is developed by the partner team CEA, EDF, FRAMATOME, and IRSN. It is a system code able to simulate the thermohydraulic behavior of cooling circuits used in the nuclear industry. CATHARE can handle 0-D, 1-D, or 3-D components. Thusly a 1-D pipe network, as well as a 3-D vessel, can be represented in the same simulation. CATHARE is one of the most powerful and sophisticated thermohydraulic codes with closure laws representing 14 terms in the 6 balance equations which involves about 200 correlations deduced from literature and validated. More information is available on the official website of CATHARE.

At G-MET Technologies we are users of the code. For instance, we have been working on complex simulations involving physics such as :

• DNBR, (Departure from Nucleate Boiling Ratio),
• Oxidation of fuel cladding (reaction Zr / H20), cladding rupture,
  rewetting in-wall, reflooding,
• Neutron coupling,
• Thermosiphon effect, natural convection, etc…

We believe that our experience in two-phase flow thermohydraulics allows us to finely analyze all the stages and physical behavior of a thermohydraulic simulation (severe accident scenario, experimental facility simulation, code benchmarking…). The knowledge of the Fortran language also allows us to work with user special subroutines for enhancing CATHARE capabilities.