NaK-toNaK and Na- to-air heat exchangers were operated for long periods. Brief descriptions of pumps and valves which were operated successfully with molten fluoride mixtures for extended periods of time at 1500 F are given. Minor modifications were made in the design of the aircraft Reactor Experiment to be constructed at ORNL the changes made during the last quarter and the progress made in detailing the system and procuring outside manufactured components are discussed, as more ยป well as a procedure that was outlined for the operation of the reactor. A design study was undertaken of a circulating-fluoride-fuel reactor core in which a thick reflector replaces the moderator. 7 A 9 8 < G 7 : 8 8 < 7 9 rporating intermediate heat exchangers led to the use of a spherical-shell type of heat exchanger and shield arrangement a diagram of such a heat-exchanger arrangement is shown.
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