 Components that were developed especially for the MSRE included flanges for lines carrying molten salt, freeze valves (an air-cooled section where salt could be frozen and thawed), flexible control rods to operate in thimbles at , and the fuel sampler-enricher.Centrifugal pumps were developed similar to those used successfully in the aircraft reactor program, but with provisions for remote maintenance, and including a spray system for xenon removal.Remote maintenance considerations pervaded the MSRE design, and developments included devices for remotely cutting and brazing together pipe, removable heater-insulation units, and equipment for removing specimens of metal and graphite from the core.