Multi-scale approach to advanced fuel modelling for enhanced safety

• We describe the multi-scale approach as applied to nuclear fuel studies.
• We present the perspective of multiscale fuel behaviour modelling at IRSN and PSI.
• We describe fuel behaviour code FRAPCON, FALCON, SCANAIR and DRACCAR.
• We present mesoscopic approach to modelling effects of fuel re-structuring.
• We present MECOX and DIFFOX fuel cladding oxidation modelling.

The activities on fuel behaviour modelling using the multi-scale approach, carried out at IRSN and PSI, are described. The perspective of the two organizations on already acquired and potential future advantages from mutual application of the micro-, meso- and macroscopic simulations for fuel reliability and safety is presented. Finally, the conclusion is put forward regarding the merit to further develop the multi-scale approach to fuel behaviour modelling at IRSN and PSI.