The salt circulating system consists  of  the circulating pump (test section),  a  throttling valve, two salt-to-air heat exchangers, and the connecting piping.It provides a closed piping loop for the molten salt from the pump discharge to the pump suction. A  salt storage tank is provided to contain the quantity of salt necessary to fill the circulating system. It  is  connected t o the circulating system by  a  pipe containing a  freeze valve. AlL  s&lt  containing components  w i l l  be  constructed of nickel-molybdenum-chromium (Ni-Mo-Cr) alloy. Electric heaters capable of heating the  salt  system  to 13OO F  will be provided. Thermal insulation  w i l l  be  installed on the system  as  appropriate.