Abstract

AbstractThe oxidation of CANDUTM fuel by the products of alpha radiolysis of water is being investigated using X-ray Photoelectron Spectroscopy and electrochemical techniques. Possible mechanisms of oxidation of U02by 02 and H202, two of the oxidants formed during radiolysis of water, are discussed. Oxidation by H202depends upon its concentration and the pH of the solution. The oxidation of U02by the products of alpha radiolysis of water, formed by an alpha flux comparable with that expected at the used- fuel surface at the estimated time of waste container failure, caused very little dissolution of UO2fuel. The presence of reductants in groundwater reaching the fuel surface will diminish the fuel oxidation by the radiolysis products.

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