Presently, the hydraulic designs for the primary and secondary salt pump are practically identical ; therefore, it is planned to operate the rotary elements of both the primary and coolant salt pumps in the test stand using a single salt identical to the reactor primary (fuel) salt, except that depleted 238U instead of enriched 23su and natural lithium instead of lithium-7 will be used. The cost of the test salt is significantly less than that of the reactor primary salt, and the chemical and physical properties of both salts are identical.