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Equipment was designed and built to demonstrate the low-pressure distillation of a 48--liter batch of irra diated fuel salt from the Molten Salt Reactor Experiment. The equipment consisted of a 48-liter feed tank, a 12liter, one-stage still reservoir, a condenser, and a 48liter condensate receiver. The equipment was tested by processing six 48-liter batches of nonradioactive LiFBeF2-ZrF4-NdF^ (65-30-5-0.3 mole X) at a temperature of •A. V W V W • 3 A distillation rate of 1.5 ft of salt per day per square :oot of vaporization surface was achieved in the nonradioactive tests. Evidences of concentration polari zation and/or entrainment were noted in some runs but not in others. Automatic operation was easily maintained in each run, although certain deficiencies in the liquidlevel measuring devices were not«»d. Condensation of volatile salt components in the vacuum lines and metal deposition in the feed line to the still pot are problems needing further attention. Since a postoperational inspection of the equipment showed essentially no dimen sional changes, the equipment was judged to be satis factory for use with radioactive material. The results of these nonradioactive tests indicate that the application of distillation to KSBR fuel salt processing is feasible.

LOW-PRESSURE DISTILLATION OF MOLTEN FLUORIDE MIXTURES: NONRADIOACTIVE TESTS FOR THE MSRE DISTILLATION EXPERIMENT.