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KMID : 0371819980300050396
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Nuclear Engineering and Technology
1998 Volume.30 No. 5 p.396 ~ p.402
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Pressure Effects on Zircaloy-4 Steamside Corrosion and Hydrogen Pick-up
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Ok Young-kill
Kim Yong-soo
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Abstract
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Experiments on the steamside corrosion and hydrogen pick-up of Zircaloy-4 under high pressure up to 10.3MPa are carried out to estimate the pressure effects on the kinetics. Temperature and reaction time are determined to be 3701C and 72hours for the pre-transition test and 700 *C and 210minutes for the post-transition test, respectively. Results show that under 10.3MPa pressure the oxidation reaction is 50x6 and 100% enhanced in the pre- and the post-transition regime, respectively. Total amount of hydrogen uptake in the reaction is proportionally increased´ as corrosion weight gain is elevated. However, pick-up fraction is not affected by the high pressure. The fraction is almost twice greater than that in the waterside corrosion. Edges in the specimens play a´certain role in the enhancement, especially in the post-transition regime. To identify physical property changes of oxide film such as micro-cracks or micro-pores, careful and thorough examination must be needed with some special techniques.
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