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Status Report on Laboratory Testing and International Collaborations in Salt

Kuhlman, Kristopher L.; Matteo, Edward N.; Hadgu, Teklu H.; Reedlunn, Benjamin R.; Sobolik, Steven R.; Mills, Melissa M.; Kirkes, Leslie D.; Xiong, Yongliang X.; Icenhower, Jonathan I.

This report is a summary of the international collaboration and laboratory work funded by the US Department of Energy Office of Nuclear Energy Spent Fuel and Waste Science & Technology (SFWST) as part of the Sandia National Laboratories Salt R&D work package. This report satisfies milestone levelfour milestone M4SF-17SN010303014. Several stand-alone sections make up this summary report, each completed by the participants. The first two sections discuss international collaborations on geomechanical benchmarking exercises (WEIMOS) and bedded salt investigations (KOSINA), while the last three sections discuss laboratory work conducted on brucite solubility in brine, dissolution of borosilicate glass into brine, and partitioning of fission products into salt phases.

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TYPE Other Report YEAR 2017
DOIOSTIDOIOSTI

Solubility of Nd(OH)3 at high pH

ANS IHLRWM 2017 - 16th International High-Level Radioactive Waste Management Conference: Creating a Safe and Secure Energy Future for Generations to Come - Driving Toward Long-Term Storage and Disposal

Icenhower, Jonathan I.; Laros, James H.; Kirkes, Leslie D.; Knox, Jandi L.; Marrs, Cassandra M.

Neodymium hydroxide, Nd(OH)3, solubility experiments were carried out in duplicate at room temperature over the pH interval of 10 to 13 for up to 670 days. The ionic radii of Nd(III) is similar to that of Pu(III) and Am(III), so that the former is an appropriate analog for the latter radionuclides. Average concentrations of Nd in solution approach a value of 2.0 × 10-7 mol/L and equilibrium concentrations show no dependence on solution pH. Compared to previous work, the data from this investigation form a continuum across pH-space, indicating agreement amongst data sets.

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TYPE Conference Poster YEAR 2017
OSTIScopus

Empirical Kinetics and Their Role in Elucidating the Utility of Transition-State Theory to Mineral–Water Reactions: A comment upon, “Evidence and Potential Implications of Exponential Tails to Concentration Versus Time Plots for the Batch Dissolution of Calcite” by V. W. Truesdale

Aquatic Geochemistry

Icenhower, Jonathan I.

Transition-state theory (TST) is a successful theory for understanding many different types of reactions, but its application to mineral–water systems has not been successful, especially as the system approaches saturation with respect to a rate-limiting phase. A number of investigators have proposed alternate frameworks for using the kinetic rate data to construct models of dissolution, including Truesdale (Aquat Geochem, 2015; this issue). This alternate approach has been resisted, in spite of self-evident discrepancies between TST expectations and the data. The failure of TST under certain circumstances is a result of the presence of metastable intermediaries or reaction layers that form on the surface of reacting solids, and these phenomena are not anticipated by the current theory. Therefore, alternate approaches, such as the shrinking object model advocated by Truesdale, represent a potentially important avenue for advancing the science of dissolution kinetics.

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TYPE Journal Article YEAR 2015
DOIOSTIScopus
13 Results
13 Results