Effect of iodine on fatigue properties of zircaloy-2 fuel cladding under cyclic tensile stress.

概要

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Effects of iodine on the cyclic tensile properties of Zircaloy-2 have been investigated at 350°C. Notched specimens, which were grooved circumferentially, and unnotched specimens were machined from the stress-relieved fuel cladding. Cyclic tensile stress was loaded on the specimens in order to get the fatigue life and failure ductility in air and in an Ar atmosphere containing iodine.<BR>The fatigue life and failure ductility of the unnotched specimens, which were pulled parallel to the longitudinal direction of the cladding, showed little decrease due to effects of the iodine environment, though many pittings due to iodine corrosion were observed on the inner surfaces.<BR>On the other hand, the fatigue properties of the notched specimens indicated the effects of iodine. This difference implies that the corrosion fatigue property of Zircaloy-2 fuel cladding under the iodine environment depends on the texture and stress state of the specimens.
一般社団法人日本原子力学会の論文