Three major tests were conducted in the molten salt flow loop to characterize the pump, to simulate various operating modes, and to operate the pump for an extended time period. The first test was designed to characterize the pump outlet head and motor current as a function of flow rate by varying the flow control-valve position between 0 and 50% opened. This test was conducted at salt temperatures of 345 ºC, 400 ºC, 455 ºC, 510 ºC, and 565ºC. The second test simulated the typical nightly shutdown, drain, and dry daily startup with a salt temperature of approximately 565 ºC and the valve opened approximately 19%. This test qualified the bearings’ ability to start dry after a full drain. The third test’s objective was to put the pump through an endurance test where the pump was run unattended in an automated sequence: 7 hours on, 1 hour off, continuously around the clock at full flow with the salt temperature at approximately 565 ºC. The test allowed the pump to experience as many hours of operation as possible, while still providing some cycling.