A Novel Cross-sectional Metallography Method for Determining Hydrogen Absorption Concentration and Hydrogen Absorption Amount of Zr-Sn-Nb Alloy Cladding Caused by High Temperature Water Corrosion
Corrosion and hydrogen absorption of zirconium alloy cladding for PWRs is one of the main causes for cladding embrittlement and breakage failure.Therefore,rapid and accurate determina-tion of hydrogen concentrations in zirconium alloys is of great importance to assess the integrity of the cladding.In this paper,we used the RH600/LECO hydrogen analyzer to measure the hydrogen concen-tration data for several samples of Zr-Sn-Nb cladding,meanwhile the corresponding data of hydrogenat-ed area fraction were acquired by cross-sectional microscopic image measurements.On the bases of the two group of data,a formula was proposed to figure out the distribution of hydrogen concentrations in Zr-Sn-Nb cladding,namely the so called cross-sectional metallography method.This method was validated by using a large amount of known data from the existing literatures.The results showed that the hydro-gen concentration values measured by the cross-sectional metallography method were highly accurate,and the error between the hydrogen concentration value and the nominal value is less than 6％.
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NSTL
万方数据
维普
