“…ALCYONE pulse-irradiation simulation capability includes (see details in [1,2,4,5]): the solving of the transient thermal heat balance equation and of the mechanical equilibrium for the pellet-gap-cladding system, based on the finite element method [42], the solving of the axial transient heat and mass balance equations for both sodium and water coolants. For NSRR stagnant water conditions under various pressure and temperature, the post-DNB stage is considered as will be detailed in the next part, material laws describing the non linear mechanical behavior of irradiated claddings (Zircaloy-4, M5® 2 ) based on the extensive PROMETRA program performed on irradiated cladding samples submitted to high strain rates and high temperatures [43,44,45].…”