Description of new meso-scale models and their implementation in fuel performance codes

This deliverable illustrates the new (2.0) version of the SCIANTIX meso-scale code, developed within Task 5.2 of the PATRICIA Project, highlighting first the code structure and its numerical features. Then, the SCIANTIX models for various physics involved in the inert gas behaviour are described in detail along with their corresponding separate-effect validation database and validation results. The coupling of SCIANTIX with integral, pin-level fuel performance codes is also introduced, presenting the different strategy and interface details for the coupling with the TRANSURANUS and GERMINAL fuel performance codes. Finally, conclusions and future perspectives are provided, mentioning several envisaged developments targeted in the framework of multiple research initiatives at a European and international level, and outlining the strategy foreseen for further developments of the code (in both its stand-alone and coupled fashion).