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Effect of experimental setting and surface roughness on oxidation behavior of Zry-4 in steam at 1273 K

Negyesi, M.; Amaya, Masaki

This work deals with oxidation behavior of Zry-4 fuel cladding exposed to steam at 1273 K. The condition corresponds to LOCA. The effect of the specimen surface roughness and experimental setting on the oxidation behavior was investigated by employing two experimental techniques for oxidation tests and metallographic analysis along with hydrogen pick-up measurement. Slower heating rate under steam flow led to significantly slower oxidation rate during the subsequent isothermal exposure. As a consequence, the breakaway was delayed substantially. The effect of the specimen surface roughness on the oxidation behavior seemed to be rather minor under the investigated conditions. On the other hand, hydrogen uptake was found to be substantially affected by both the specimen surface roughness and the tested experimental setting.

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