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Chemical Treatment of High Level Waste for Utilization
Pages 199-207

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From page 199...
... In order to achieve a closed fuel cycle, proper management of long-lived radionuclides contained in spent nuclear fuel, optimization of existing high-level waste reprocessing methods, and separation technologies for new and existing reprocessing plants have been studied over the last 20 years. These studies have been carried out at several Russian institutes (for example, the Khlopin Radium Institute, Institute of Chemical Technology, Institute of Physical Chemistry, and Institute of Geochemistry and Analytical Chemistry)
From page 200...
... A special advantage of the DCH-6 method is the simplicity and efficiency of conducting the strontium stripping operation using water. RECOVERY OF CESIUM AND STRONTIUM USING CHLORINATED COBALT DICARBOLLIDE Fundamental studies on the extraction of Cs and Sr by cobalt(III)
From page 201...
... . nitric acid dependencies for the extraction of Sr and Cs using a 0.01 M solution of cobalt(III)
From page 202...
... This extraction mixture recovers more than 99.5 percent of the cesium and strontium. The most notable achievement in the use of the ChCoDiC process in Russia relates to the reprocessing of high-level waste of varying composition at Mayak Production Association.3 Using this technology, the first commercial facility in the world (UE-35)
From page 203...
... The DAm versus aqueous HNO3 concentration curve using a 0.05 M DPhDBCMPO solution in fluoropol-732 is shown in Figure 2. These data show that the values of DAm obtained with the DPhDBCMPO-fluoropol system are significantly higher, using only one-fourth the concentration of CMPO of those obtained with the TRUEX process solvent over the entire nitric acid concentration range.
From page 204...
... , t=25°C. TRPO process solvent (30 vol percent TRPO ­ kerosene)
From page 205...
... SEPARATION OF ACTINIDES AND LANTHANIDES BY COUNTERCURRENT CHROMATOGRAPHY The most effective method for TPE separation from highly radioactive wastes is extraction based on the use of bidentate neutral organophosphorus compounds (BNOC) .5 A technological scheme of TPE removal with diphenyl (dibutyl-carbamoylmethyl)
From page 206...
... When potassium ferrocyanide is added to an americium solution in 0.1 M nitric acid, a white precipitate forms, just as in the case of REE. When potassium ferricianide is added, an americium species precipitates from the acidic solution, contrary to REE (see Table 2)
From page 207...
... 1993. Proceedings of the International Conference and Technology Exhibition on Fu ture Nuclear Systems: Emerging Fuel Cycles and Waste Disposal Options, GLOBAL `93, September 12­17, 1993, Seattle, Washington 1:581­587.


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