Eight solvent extraction runs were completed during the quarter. Bench-scale tests on oxidation of HTGR fuel boron carbide at 900/sup 0/C indicates that most if not all of the carbide will be converted to boron oxide in the fluidized bed burner. Two-stage leaching runs with burned-back ThC/sub 2/ indicate there are no measurable differences in total dissolution time as compared to single-stage leaching. Only minor effects were observed and reference values for facility operations were specified. Twelve leaching runs were performed during the quarter using crushed, burned-back TRISO coated ThC/sub 2/ particles and burned-back BISO coated sol gel ThO/sub 2/ particles to examine the effect of varying the Thorex-to-thoria ratio to give product solutions ranging from 0.25M to 1M in thorium.
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Experimental work on the 20-cm more » primary fluidized bed burner verified the fines recycle operating mode in runs of greater than 24 hr.
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Studies of flow characteristics of granular solids in pneumatic transfer systems are continuing and data are being collected for use in design of systems for solids handling.
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Fabrication and receipt of all major components is under way, and auxiliary instrumentation and support systems are being installed. Design work on the multistage crushing system, the primary and secondary fluidized bed burners, the pneumatic transfer systems, and the ancillary fixtures for semiremote assembly and disassembly is essentially complete. The development program for HTGR fuel reprocessing continues to emphasize the design and construction of a prototype head-end line.