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Conference papers
Mechanical behavior at high temperature of highly oxygen- or hydrogen-enriched α and (prior-) $\beta$ phases of zirconium alloys
Abstract : During a hypothetical loss-of-coolant accident (LOCA), zirconium alloy fuel claddings can be loaded by internal pressure and exposed to steam at high temperature (HT, potentially up to 1200°C) until they are cooled and water quenched. A significant fraction of the oxygen reacting with the cladding during oxidation at HT diffuses beneath the oxide through the metallic substrate. This diffusion of oxygen induces a progressive transformation of the metallic $\beta _{Zr}$ phase layer into an intermediate layer of $\alpha _{Zr}$(O) phase containing up to 7 wt.% of oxygen.
Furthermore, in some specific conditions, the cladding may rapidly absorb a significant amount of hydrogen during steam exposition at high temperature. Then, hydrogen, as a $\beta _{Zr}$-stabilizer, would mainly diffuse and concentrate up to several thousands of wt.ppm into the inner$\beta _{Zr}$ phase layer
Cited literature [75 references]
https://hal-cea.archives-ouvertes.fr/cea-02442337
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Submitted on : Thursday, January 16, 2020 - 1:42:46 PM
Last modification on : Monday, December 13, 2021 - 9:14:40 AM
Long-term archiving on: : Friday, April 17, 2020 - 8:35:14 PM
Contributor : Amplexor Amplexor Connect in order to contact the contributor
Submitted on : Thursday, January 16, 2020 - 1:42:46 PM
Last modification on : Monday, December 13, 2021 - 9:14:40 AM
Long-term archiving on: : Friday, April 17, 2020 - 8:35:14 PM
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201600000367.pdf
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