The primary salt pump is expected to be located at the reactor core outlet in the  Molten Salt Breeder Experiment  and thus will operate in the highest temperature salt, approximately  1300°F,  in the primary salt system. The secondary salt pump  will  be located at  the  outlet  of  the intermediate heat exchanger and thus will operate in the highest temperature salt, approximately  i150°F,in the secondary salt system. m e primary salt pump tank will be located in an oven, which will enclose the primary system, and portions of the pump  w i l l  be subjected to a high ambient temperature, estimated to be 1100°F.  In addition, it will be subjected to intense nuclear radiation from components in the primary system, the circulating fuel in the pump tank, and from gas-borne fission products in the pump tank gas space.