Actinide (III) solubility in WIPP Brine: data summary and recommendations

Borkowski, Marian ; Lucchini, Jean-Francois ; Richmann, Michael K. ; Reed, Donald T.

Los Alamos National Laboratory

关键词: 12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities;    Actinides;    Wipp;    Solubility;    Recommendations;   

DOI  :  10.2172/966984
RP-ID  :  LA-14360
RP-ID  :  DE-AC52-06NA25396
RP-ID  :  966984

美国|英语

来源: UNT Digital Library

【 摘 要 】

The solubility of actinides in the +3 oxidation state is an important input into the Waste Isolation Pilot Plant (WIPP) performance assessment (PA) models that calculate potential actinide release from the WIPP repository. In this context, the solubility of neodymium(III) was determined as a function of pH, carbonate concentration, and WIPP brine composition. Additionally, we conducted a literature review on the solubility of +3 actinides under WIPP-related conditions. Neodymium(III) was used as a redox-invariant analog for the +3 oxidation state of americium and plutonium, which is the oxidation state that accounts for over 90% of the potential release from the WIPP through the dissolved brine release (DBR) mechanism, based on current WIPP performance assessment assumptions. These solubility data extend past studies to brine compositions that are more WIPP-relevant and cover a broader range of experimental conditions than past studies.