Plutonium Chemistry in the UREX+ Separation Processes

[摘要] The project "Plutonium Chemistry in the UREX+ Separation Processes” is led by Dr. Alena Paulenova of Oregon State University under collaboration with Dr. George Vandegrift of ANL and Dr. Ken Czerwinski of the University of Nevada at Las Vegas. The objective of the project is to examine the chemical speciation of plutonium in UREX+ (uranium/tributylphosphate) extraction processes for advanced fuel technology. Researchers will analyze the change in speciation using existing thermodynamics and kinetic computer codes to examine the speciation of plutonium in aqueous and organic phases. They will examine the different oxidation states of plutonium to find the relative distribution between the aqueous and organic phases under various conditions such as different concentrations of nitric acid, total nitrates, or actinide ions. They will also utilize techniques such as X-ray absorbance spectroscopy and small-angle neutron scattering for determining plutonium and uranium speciation in all separation stages. The project started in April 2005 and is scheduled for completion in March 2008.

[发布日期] 2009-10-01

[学科分类] 物理（综合）

[关键词] ACTINIDES;CHEMISTRY;COMPUTER CODES;DISTRIBUTION;KINETICS;NEUTRONS;NITRATES;NITRIC ACID;PLUTONIUM;SCATTERING;SEPARATION PROCESSES;SPECTROSCOPY;THERMODYNAMICS;URANIUM;VALENCE