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The nodular corrosion resistance of N36 (Zr–0.8Sn–1Nb–0.3Fe–0.12O, wt%) alloy with different temperatures of interstage annealing and optimized Zircaloy-4 (lower content of tin) cladding tubes were tested in 500 °C and 10.3 MPa superheated steam. The result showed that no nodular spots appeared on surface of N36 alloy cladding tubes after 500 h corrosion, while nodular spots on optimized Zircaloy-4...
The modeling of heat generation after liquefied U–Zr–O pours through a breach in the ZrO2 layer and relocates on the outside surface of the fuel rod requires total amount of molten material which relies chiefly on the failure of ZrO2 layer. A new criterion is developed in this paper based on the kinetics of UO2 and ZrO2 dissolved simultaneously by molten zircaloy and the stress of the ZrO2 layer....
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