Creep model for PWR spent nuclear fuel

After reactor operation spent nuclear fuel (SNF) has been stored in wet storage. The coolant temperature of wet storage is below 55℃ . Due to low temperatures, cladding creep is not activated. However, after wet storage, SNF transferred to dry storage. Initial peak cladding temperature in dry storage is known around 400oC. Therefore, cladding creep in dry storage has been considered as a main degradation mechanism which can bring a gross rupture of the cladding. In general, cladding creep in dry storage is recognized as a thermal creep because the fast neutron fluence is very low compare to in-reactor condition. In this work, we reviewed the creep model of PWR cladding material