It is likely that these compositions are even more promising because of the reduction in the proportion of lithium halides in favor of sodium and potassium. Obviously, the three compositions considered are only a part of the variety of potentially interesting high-entropy coolants for nuclear power engineering. It is important to note that near the equimolar mixture of six sodium and potassium lithium fluorides and chlorides, there is a certain region of potentially interesting compositions with increased stability. Within this range, one can try to find the most optimal melt in terms of the combination of physical and chemical properties.