Uranium nitride fuels in superheated steam
| Autor: | Pertti Malkki, Mikael Jolkkonen, Janne Wallenius, Kyle D. Johnson |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Superheated steam Uranium dioxide Pellets chemistry.chemical_element 02 engineering and technology Uranium Nitride 021001 nanoscience & nanotechnology complex mixtures 01 natural sciences Nitrogen 010305 fluids & plasmas Reaction rate chemistry.chemical_compound Nuclear Energy and Engineering chemistry Chemical engineering 0103 physical sciences 0210 nano-technology Uranium nitride Nuclear chemistry |
| Zdroj: | Journal of Nuclear Science and Technology. 54:513-519 |
| ISSN: | 1881-1248 0022-3131 |
| DOI: | 10.1080/00223131.2017.1291372 |
| Popis: | Uranium mononitride (UN) pellets of different densities were subjected to a superheated steam/argon mixture at atmospheric pressure to evaluate their resistance to hydrolysis. Complete degradation of pure UN pellets was obtained within 1 h in 0.50 bar steam at 500 °C. The identified reaction products were uranium dioxide, ammonia, and hydrogen gas, with no detectable amounts of nitrogen oxides formed. However, the reaction could not be carried to completion, and the presence of uranium sesquinitride and higher uranium oxides or uranium oxynitrides in the solid residue is indicated. Evolution of elemental nitrogen was seen in connection with very high reaction rates. The porosity of the pellets was identified as the most important factor determining reaction rates at 400–425 °C, and it is suggested that in dense pellets, cracking due to internal volume increase initiates a transition from slow surface corrosion to pellet disintegration. The implications for the use of nitride fuels in light water r... |
| Databáze: | OpenAIRE |
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