| 4D Computer Models of T-x-y-z Diagrams Within the Tetrahedrized Fluoride-Chloride Quaternary Reciprocal Systems To Design The Fuels of Nuclear Reactor Generation 4 Vera Vorob'eva1; Anna Zelenaya1; Vasily Lutsyk1; Marina Lamueva2; Maria Parfenova1; 1INSTITUTE OF PHYSICAL MATERIALS SCIENCE SB RAS, Ulan-Ude, Russian Federation; 2INSTITUTE OF PHYSICAL MATERIALS SCIENCE, Ulan-Ude, Russian Federation; PAPER: 210/Molten/Regular (Oral) SCHEDULED: 12:20/Wed. 30 Nov. 2022/Game ABSTRACT: The fuel compositions for molten-salt nuclear reactor of the 4th generation are usually fluorides of metals with a small cross-section of neutron capture [1-3]. Сhloride systems, compared to fluoride, have higher vapor pressures and lower thermodynamic stability at high temperatures. At the same time, they are less aggressive in relation to the structure of the material and have lower melting temperatures. Therefore, in order to ensure the more reliable operation of the next generation reactors, it is necessary to consider chemical processes and equilibrium in mutual fluoride-chloride systems. Among the binary systems composed of fluoride or chlorides of alkaline metals and uranium (plutonium) we can say, that all fluoride systems forming ternary M1,M2,U(Pu)||F (M1,M2=Li,Na,K,Rb) are experimentally studied in more or less detail. But the chloride systems M1,M2,U(Pu)||Cl (M1,M2=Li,Na,K,Rb) have been studied much less. And there is no information about the study of ternary reciprocal systems M,U(Pu)||F,Cl (M=Li,Na,K,Rb). Accordingly, the polyhedration of the M1,M2,U(Pu)||F,Cl (M1,M2=Li,Na,K,Rb) quaternary reciprocal systems can only be multivariate, and the construction of 4D computer models T-x-y-z diagrams of the resulting subsystems - virtual. Four variants of the Li,Na,U||F,Cl system polyhedration are discussed and 3 quintets of four- dimensional T-x-y-z diagrams for the quaternary systems have been forecasted. This work was been performed under the program of fundamental research SB RAS (project 0336-2019-0008), and it was partially supported by the RFBR project 19-38-90035. References: 1. Thoma R.E., Editor. Phase Diagrams of Nuclear Reactor Materials. – Union Carbide<br />Corp., Oak Ridge, Tennessee, 1959. – 205 pp.<br />2. Gabcova J., Peschl J., Malinovsky M. et al //Chemicke Zvesti (Chemical Papers). 1976.<br />V. 30. No 6. P. 796-804.<br />3. Vorob’eva V., Zelenaya A., Lutsyk V., Lamueva M. T-x-y-z Diagram Prediction for the<br />Quaternary System Li,Na,Ca,La||F // IOP Conference Series: Materials Science and Engineering.<br />- 2020. - V. 1000, 012007. |
