고압 수증기하 산화에서 핵연료 피복관내 수소효과 연구
The Effect of Hydrogen in the Nuclear Fuel Cladding on the Oxidation under High Temperature and High Pressure Steam
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The characteristics of oxidation for the Zry-4 was measured in the 800oC and high steam pressure (50 bar,75 bar, 100 bar) conditions, using an apparatus for high pressure steam oxidation. The effect of acceleratedoxidation by high-pressure steam was increased more than 60% in hydrogen-charged cladding than normalcladding. This difference between hydrogen charged claddings and normal claddings tends to be larger asthe higher pressure. The accelerated oxidation effect of hydrogen charging cladding is regarded as the hydrogenon the metal layer affects the formation of the protective oxide layer. The creation of the sound monoclinicphase in Zry-4 oxidation influences reinforcement of corrosion-resistance of the oxide layer. The oxidationis estimated to be accelerated due to the creation of equiaxial type oxide film with lower corrosion resistancethan that of columnar type oxide film. When tetragonal oxide film transformed into the monoclinic oxidefilm, surface energy of the new monoclinic phase reduced by hydrogen in the metal layer.
Abstract
The characteristics of oxidation for the Zry-4 was measured in the 800oC and high steam pressure (50 bar,75 bar, 100 bar) conditions, using an apparatus for high pressure steam oxidation. The effect of acceleratedoxidation by high-pressure steam was increased more than 60% in hydrogen-charged cladding than normalcladding. This difference between hydrogen charged claddings and normal claddings tends to be larger asthe higher pressure. The accelerated oxidation effect of hydrogen charging cladding is regarded as the hydrogenon the metal layer affects the formation of the protective oxide layer. The creation of the sound monoclinicphase in Zry-4 oxidation influences reinforcement of corrosion-resistance of the oxide layer. The oxidationis estimated to be accelerated due to the creation of equiaxial type oxide film with lower corrosion resistancethan that of columnar type oxide film. When tetragonal oxide film transformed into the monoclinic oxidefilm, surface energy of the new monoclinic phase reduced by hydrogen in the metal layer.
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