The Mechanism of Localized In-pile Corrosion of Zirconium Alloys.

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  • Mechanism of Localized In-pile Corrosio

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The role of β-particles for the localized in-pile corrosion of components made of zirconium alloys, such as fuel channels closely facing stainless steel components, has been discussed and the distribution of β-particles near fuel channels has been evaluated using a multi-layer calculation method.<BR>It is shown that electric charges which come from β-particles produced mainly by the Compton effect, but not by β-emitting radionuclides, make electric fields in and on the zirconium oxide surfaces in the reactor by a model analogous to an electric circuit, and that these electric fields induced by β-particles could be essential for the understanding of localized in-pile corrosion of zirconium alloys. The mechanism of the localized in-pile corrosion of zirconium alloys adjacent to other welded alloys is also discussed as an enhanced corrosion by electric potentials using the proposed electric circuit model in detail.

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