PROCESSING OF MOLTEN SALT POWER REACTOR FUEL
ABS> Fuel reprocessing methods are being investigated for molten salt nuclear reactors which use LiF--BeF/sub 2/ salt as a solvent for UF/sub 4/ and ThF/sub 4/. A liquid HF dissolution procedure coupled with fluorination has been developed for recovery of the uranium and LiF- BeF/sub 2/ solvent salt which is highly enriched in Li/sup 7/. The recovered salt is decontaminated in the process from the major reactor poisons; namely, rare earths and neptunium. A brief investigation of alternate methods, including oxide precipitation, partial freezing, and metal reduction, indicated that such methods may give some separation of the solvent salt from reactor poisons, but they do not appear to be sufficiently quantitative for a simple processing operation. Solubilities of LiF and BeF/sub 2/ in aqueous 70t0 100% HF are presented. The BeF/sub 2/ solubility is appreciably increased in the presence of water and large amounts of LiF. Salt solubilities of 150 g/liter are attainable. Tracer experiments indicate that rare earth solubilities, relative to LiF-- BeF/sub 2/ solvent salt solubility, increase from about 10/sup -4/ mole% in 98% HF to 0.003 mole% in 80% HF. Fluorination of uranium from LiF--BeF/sub 2/ salt was demonstrated. This appears feasible also for the recovery of the relatively small ccncentration of uranium produced in the LiF- BeF/sub 2/ThF/sub 4/ blanket. A proposed chemical flowsheet is presented on the basis of this exploratory work as applied to the semicontinuous processing of a 600 Mw power reactor. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-13-012536
- OSTI ID:
- 4241547
- Report Number(s):
- CF-59-2-61
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHEMISTRY
COOLING
DIAGRAMS
FISSION PRODUCTS
FLUORIDES
FLUORINATION
FUSED SALT FUEL
HYDROFLUORIC ACID
LITHIUM 7
LITHIUM FLUORIDES
MEASURED VALUES
METALS
MIXING
NEPTUNIUM FLUORIDES
OPERATION
OXIDES
PERFORMANCE
POWER PLANTS
PRECIPITATION
QUANTITY RATIO
RARE EARTHS
RECOVERY
REDUCTION
REPROCESSING
SOLUBILITY
SOLUTIONS
THORIUM FLUORIDES
TRACER TECHNIQUES
URANIUM TETRAFLUORIDE
USES
WATER