Radionuclide Reaction Chemistry as a Function of Temperature at the Cheshire Site

Evaluation of the Transient Hydrologic Source Term for the Cambric Underground Nuclear Test at Frenchman Flat, Nevada test Site

“…In effect, the simulations produce accurate radionuclide retardation values at high temperatures only if it is assumed that radionuclide speciation, surface protonation/deprotonation, surface complexation, ion exchange, and radionuclide solubility are not strongly temperature dependent between 25 and 170 ºC. This is clearly not the case (Burton et al, 2005). Nevertheless, by 1.3 y, glass zone temperatures have decreased to <50 ºC and, thus, radionuclide retardation factors calculated at ≥1.3 y should not have increased uncertainty resulting from limitations in the temperature-dependent thermodynamic data.…”

“…The effect of temperature on radionuclide speciations constants was not included. Burton et al (2005) conducted a detailed analysis of radionuclide speciation as a function of temperature. Established estimation techniques such as the Criss-Cobble method and other correlation algorithms were tested to calculate thermodynamic parameters needed to extrapolate aqueous complexation data to higher temperatures.…”

“…However, as in the case of aqueous complexation, insufficient data and/or extrapolation algorithms are available to adequately predict the effect of temperature on sorption. Burton et al (2005) concluded that using 25 °C data for all temperatures may be the best modeling approach currently available. 6.63±0.54 a Sm data were not available; reaction constants were set equal to Eu.…”

Phase II Corrective Action Investigation Plan for Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada, Revision 2

“…Results of the experimental data and a review of literature data in this report, provides sufficient data to incorporate Mn oxide sorption reactions into HST (and upscaled) models and provide less conservative estimates of RN transport. (Burton et al, 2005) This report describes a task to compile thermodynamic data available in literature and to evaluate the options and benefits of applying temperature-dependent RN speciation to future HST modeling. The focus of this evaluation was LLNL's experience of HST modeling at CHESHIRE.…”

Thermal conductivity in a vadose zone: A novel spectral solution and application by the implication of significant coherence of thermal condition in the shallow soil water layer

“…The vital mission aims to use controlled heat conduction to reduce contaminant mobility and prevent their migration into deeper soil layers or groundwater. By understanding and controlling heat conduction, one can manipulate the temperature distribution to inhibit the movement of radionuclides, thereby containing the contamination within the shallow layer (Burton et al, 2005; Mulligan et al, 2001). When the study delves into optimizing energy input for heat conduction‐based decontamination, a practical approach reduces energy consumption and related expenses, rendering it a more sustainable and economically efficient solution.…”