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Urenco USA marks enrichment milestones
Urenco USA has highlighted the completion of a successful year of advancing nuclear fuel supply in the U.S. by achieving two new milestones this month: The first production of enriched uranium above 5 percent uranium-235, and the startup of the company’s next cascade of centrifuges as part of its capacity installation program.
Yuezhou Wei, Mikio Kumagai, Yoichi Takashima, Giuseppe Modolo, Reinhard Odoj
Nuclear Technology | Volume 132 | Number 3 | December 2000 | Pages 413-423
Technical Paper | Reprocessing | doi.org/10.13182/NT00-A3154
Articles are hosted by Taylor and Francis Online.
To develop an advanced partitioning process by extraction chromatography using a minimal organic solvent and compact equipment to separate minor actinides such as Am and Cm from nitrate acidic high-level waste (HLW) solution, several novel silica-based extraction resins have been prepared by impregnating organic extractants into the styrene-divinylbenzene copolymer, which is immobilized in porous silica particles (SiO2-P). The extractants include octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO), di(2-ethylhexyl)-phosphoric acid (HDEHP), and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301). Compared to conventional polymer-matrix resins, these new types of extraction resin are characterized by rapid kinetics and significantly low pressure loss in a packed column.The results of separation experiments revealed that trivalent actinides and lanthanides can be separated from other fission products, such as Cs, Sr, and Ru in simulated HLW solution containing concentrated nitric acid by extraction chromatography using a CMPO/SiO2-P resin-packed column. Satisfactory separation between Am(III) and a macro amount of lanthanides from simulated HLW solution with pH 4 was achieved by using a newly purified Cyanex 301/SiO2-P resin. However, the Am(III) separation was very sensitive to the purity of Cyanex 301, and the improvement of its stability is an important task for practical utilization.
