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Effect of axial temperature gradient on oxidation of Zircaloy-2 cladding under high temperature steam

Ioka, Ikuo  ; Kato, Hitoshi; Ogawa, Hiroaki  

When the function of cooling system for a spent fuel pool is lost, the spent fuel pin is exposed to steam and air environment. In addition, oxidation behavior of the cladding may be changed due to axial temperature gradient and induced stress gradient during the process of dry out of the spent fuel pool. The oxidation behavior of the Zircaloy-2 cladding under axial temperature gradient was investigated in this study. The axial temperature gradients was about 100 $$^{circ}$$C/cm. The oxidation test was carried out at 600 $$^{circ}$$C in the saturated steam flow with Ar of 0.5 l/min as a career gas. Little difference was seen in the configuration of the surface cracks and the oxide thickness of specimens oxidized with different temperature gradients. Consequently, the high-temperature oxidation of Zircaloy-2 cladding was hardly changed by the steep axial temperature gradient of about 100 $$^{circ}$$C/cm in this study.

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