4.3 Article

Thermophysical properties of liquid (U, Zr)O2 by molecular dynamics

Journal

MOLECULAR SIMULATION
Volume 47, Issue 18, Pages 1502-1508

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/08927022.2021.1987429

Keywords

Nuclear fuel; corium; molecular dynamics

Funding

  1. Welsh European Funding Office (WEFO)

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In-depth understanding of nuclear fuel behaviour is crucial for preventing severe accidents. Evaluation of existing interatomic potentials and determination of new parameters can improve knowledge on liquid mixtures and achieve good agreement with experimental data at high temperatures.
In-depth understanding of nuclear fuel behaviour under operation is critical to anticipate and prevent severe accidents. Loss-of-cooling events can lead to core meltdown, and formation of U-Zr-O liquids (the basic components of corium lavas), formed of molten fuel and cladding. To improve the knowledge on those liquid mixtures, we evaluate the ability of existing interatomic potentials (CRG and Yakub) for solid-phase (U, Zr)O-2 to accurately reproduce density and heat capacity of molten UO2 and ZrO2 and their binary mixes within molecular dynamics simulations. Facing their limits, we determine a new set of parameters for the CRG potential through optimisation on a single experimental density point for ZrO2 (d=0.070 atoms/angstrom(3) at T=2900 K). The proposed fitted potential shows good agreement during validation with experimental data when applied at high temperatures.

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