Conference Proceedings Paper
U-RU-RH-PD QUATERNARY SYSTEM: THERMODYNAMIC CALCULATIONS AND EXPERIMENTAL EXPLORATIONS
36th Annual CNS Conference - 2016 June 19-22
M.H. Kaye (University of Ontario Institute of Technology)
L. Wang (University of Ontario Institute of Technology)
Fission products (FPs) in burned up nuclear fuels form a very complex system. In simulating the behavior of the FPs, multicomponent phase equilibrium data are needed in some thermodynamic and dynamic codes used in nuclear industry. Typically,an inclusion consisting of URu3, URh3 and UPd3 were found in post irradiation examinations and it was called “the other intermetallic inclusion” to distinguish with the “white inclusion”, which is consisted of Mo, Ru, Rh, Pd and Tc. A few attempts in obtaining important isothermal sections involving these compounds were conducted experimentally during the 1990s, nonetheless, no further justification were conducted. In this work, by means of establishing the quaternary thermodynamic model, the validation of these experimental results becomes feasible. The paper is an introduction to the calculated URu3-URh3- UPd3 quasi-phase diagram, U-Rh-Pd isothermal section and a comparison of them with their experimental counterparts. The results show that the model can predict phase equilibria at conditions that no experimental data are available and can identify some experimental fallacies.
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