“…All in all, there are six variations including very high-temperature reactor (VHTR), sodium-cooled fast reactor (SFR), supercritical-water-cooled reactor (SCWR), gascooled fast reactor (GFR), lead-cooled fast reactor (LFR) and molten salt reactor (MSR). [1][2][3][4][5] Among the advantages of the MSR, we shall mention low vapor pressures at high temperatures ranging from 773 to 1023 K, which is characteristic for molten salts; such media as fluoride [6][7][8][9][10] and chloride 10,11 mixtures of alkali metals are well known by their high specific thermal capacity per the volume unity; molten salts are radiation resistant compounds that do not react with fuel in emergency case; the requirement for fuel preparation are minimal and the molten salt nuclear reactor design allows extracting the fission products and supplying fissile materials during the reactor operation. 12 Molten fluoride and chloride mixtures media proved to be more cost-efficient than aqueous media, as degradation processes caused by the process of water radiolysis are eliminated and the total exposure time required for processing of spent nuclear fuel with high burnup is reduced.…”