L. A. Karpyuk, V. I. Kuznetsov, V. V. Novikov, E. N. Mikheev, A. V. Fedotov, A. V. Lysikov, R. B. Sivov, N. M. Rysev, O. A. Bakhteev, M. A. Lutkov
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Corrosion tests of triuran disilicide fuel pellets
The study aims to determine the corrosion stability of triuranium disilicide pellets under the conditions similar to small-nuclear plant (SNPP) modes. For this, corrosion tests were carried out in comparison with uranium dioxide in zirconium mini-autoclaves with distilled (deionized) water at a pressure of 16.2 MPa using a Nabertherm muffle furnace (Germany) at a temperature of 331 ± 3 °C and isothermal exposure of 4 and 10 h. The temperature of isothermal sections was calibrated and controlled using a rhenium-tungsten thermocouple located near the mini-autoclaves. After a 4h exposure, the surface of the triuranium disilicide sample was slightly oxidized without destruction. After 10 h, it was oxidized with a slight detachment of fine particles. The mass gain of the sample together with exfoliated fine particles comprised 0.5% (25 mg). No uranium dioxide was detected on the standard fuel pellet under these oxidation modes.
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Atomic Energy publishes papers and review articles dealing with the latest developments in the peaceful uses of atomic energy. Topics include nuclear chemistry and physics, plasma physics, accelerator characteristics, reactor economics and engineering, applications of isotopes, and radiation monitoring and safety.
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