During first rise to power in Power Water Reactor, fuel pellets crack because of thermal expansion. The phenomena of pellet cracking and fragments relocation have a major influence on rod behaviour and especially on the cladding behaviour in the case of pellet-cladding interaction.This article presents the modeling used to take into account the fragmented state of the pellet in the EDF fuel rod thermomechanical code, CYRANO3 ® . The aim is to simulate more realistic stress and strain fields in the pellet.The …
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