The fuel cladding is an essential component in the defence-in-depth strategy for
nuclear safety. Its integrity and durability are therefore critical for maintaining
acceptable safety conditions. However, the integrity of the cladding can be
compromised during normal operation due to corrosion and hydriding. To ensure
a sufficient level of safety, design and safety criteria have been established to limit
oxidation and hydriding. EDF has various multiphysics software tools at its disposal
to ensure that these criteria are met. One such tool, CYRANO3, uses oxide thickness
measurements from the beginning of the French nuclear industry to model corrosion
and hydriding. This study aims to improve CYRANO3 by expanding its validation
database and improving its models.