Abstract
The visible reaction occurring at a uranium surface exposed to 700 mm hydrogen at 170°C was observed under the microscope. Initial attack was localized and of two types: one readily visible and developing randomly at inclusion sites, the other seen only at relatively high magnification developing with uniform distribution. Rates of formation of attack sites of both types on clean uranium were found to be high. With increasing thickness of oxide film up to 1000 Å rates were progressively lower. It is proposed that attack sites are formed at local deficiencies in the oxide film around inclusions and through film porosity.
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