Abstract
For a better understanding of the initiation step of iodine-induced stress corrosion cracking in Zr alloys, responsible for pellet–cladding interaction (PCI) fuel rod failures, an analytical study has been undertaken, the aim of which being focused on the respective roles of local chemistry and stress/strain state on the crack nucleation. This first part is mostly related to the chemical environment. From the tensile tests performed under iodine rich and inert environments, it was concluded that no crack initiation could be detected following the tests in an inert atmosphere. The iodine induced stress corrosion initiation mechanism must therefore be analysed as a corrosion–strain interaction.
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