Multi-physics tools development

For the assessment of the safety of the MSFR during various transient scenarios, multi-physics tools are necessary to capture the appropriate physics of the reactor system. Classical codes used in reactor physics cannot be used as they do not allow for the key features of the MSFR. The special features of the MSFR include the movement of precursors with the moving fuel, the strong coupling between the neutronics and the thermal-hydraulics due to the use of liquid fuel, the internal heat generation and the shape of the core having no fuel pins as a repeated structure. These features cause a variety of phenomena occurring during transients that are particular to the MSFR. Dedicated tools have been developed before and during this project specifically for this purpose. The present document represents a basic description of the tools used in the SAMOFAR project. The capabilities of these codes include detailed computational fluid dynamics analysis, (2D, 3D, geometrically flexible) detailed neutronics (diffusion, transport), and incorporation of complex physics such as gas bubbling, melting and solidification. Specifically the code systems of CNRS, KIT/EdF, TUD, PoliMi and PSI are described.