Description
| Summary: | For improved Zircaloy-2 cladding tubes used in Japanese BWRs, ?+? heat treatment is used on the outer surface of the tubeshell to suppress nodular corrosion. This treatment also provides superior uniform corrosion behavior up to 40 GWd/t. To investigate the effect of ?+? heat treatment on corrosion behavior, the size distributions of second-phase particles in improved Zircaloy-2 cladding tubes and their changes during irradiation were observed and measured using an analytical transmission electron microscope. These cladding tubes were found to have smaller particles than previous ones. The dissolution rate of iron and nickel (Fe and Ni) was calculated as a function of particle size, chemical compositions of cladding tubes, and fast neutron flux. The relationship between corrosion behavior and the dissolution rate of Fe and Ni is described. Nodular corrosion occurred when the dissolution rate of Fe and Ni was slow
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| Physical Description: | 1 online resource (20 pages) : illustrations, figures, tables |
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| Bibliography: | Includes bibliographical references |
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| Access: | Restricted for use by site license. |
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