Radial diffusion of radiocaesium and radioiodide through cementitious backfill

Felipe-Sotelo, M.; Hinchliff, J.; Drury, D.; Evans, Nicholas D.M.; Williams, S. Jeffress; Read, David

doi:10.1016/j.pce.2014.04.001

Cited by 12 publications

(12 citation statements)

References 32 publications

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“…Known concentrations of chloride were added to the central well, which was then sealed and submerged in either NRVBequilibrated water or a CDP solution. For experiments in the absence of organic ligands, the solution used for the tests was the water in which the cylinders had been cured; this minimizes changes in the NRVB matrix owing to leaching or precipitation (see Felipe-Sotelo et al (2014) for a detailed description of the composition of the NRVB-equilibrated water and CDP solution used in the present work). The preparation of CDP followed a modification of the procedure reported by Chambers et al (2004).…”

Section: Methodsmentioning

confidence: 99%

“…This ensured equilibration of the CDP throughout the NRVB. The equilibration time was determined in a separate experiment using total organic carbon (TOC) analysis (Felipe-Sotelo et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…Cellulose degradation products (CDP) are a complex mixture of water-soluble polyhydroxylic ligands and may affect both the solubility and the sorption behaviour of radionuclides by forming stable complexes with transition metals, the lanthanides and the actinide series (Glaus et al, 1999). Even where significant complexation does not occur, CDP have been shown to modify radionuclide migration by impacting cement matrices (Felipe-Sotelo et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Retention of chlorine-36 by a cementitious backfill

Hinchliff

Felipe-Sotelo

et al. 2015

Mineral. mag.

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Radial diffusion experiments have been carried out to assess the migration of 36 Cl, as chloride, through a cementitious backfill material. Further experiments in the presence of cellulose degradation products were performed to assess the effect of organic ligands on the extent and rate of chloride diffusion. Results show that breakthrough of 36 Cl is dependent on chloride concentration: as the carrier concentration increases, both breakthrough time and the quantity retained by the cement matrix decreases. Experiments in the presence of cellulose degradation products also show a decrease in time to initial breakthrough. However, uptake at various carrier concentrations in the presence of organic ligands converges at 45% of the initial concentration as equilibrium is reached. The results are consistent with organic ligands blocking sites on the cement that would otherwise be available for chloride binding, though further work is required to confirm that this is the case. Post-experimental digital autoradiographs of the cement cylinders, and elemental mapping showed evidence of increased 36 Cl activity associated with black ash-like particles in the matrix, believed to correspond to partially hydrated glassy calciumsilicate-sulfate-rich clinker.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Retention of chlorine-36 by a cementitious backfill

Hinchliff

Felipe-Sotelo

et al. 2015

Mineral. mag.

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“…The NRVB was prepared according to the NDA specification (Nuclear Decommissioning Authority, 2010), containing 0.26 fraction weight OPC, 0.29 of limestone flour, 0.1 of hydrated lime and 0.35 water. Full details can be found elsewhere regarding the preparation of 0.02M NaOH and 95%-saturated Ca(OH)2 (Felipe-Sotelo et al, 2016a), and the NRVB and CDP solutions (Felipe-Sotelo et al, 2014). The composition of the solutions is provided in Table 1.…”

Section: Solubility Experimentsmentioning

confidence: 99%

“…The experiments include solubility determinations in a variety of alkaline solutions together with batch sorption, throughdiffusion and advection tests over extended periods of time, from several months to four years. The work forms part of a wider programme that, to date, has investigated adsorption (Felipe-Sotelo et al, 2012) and the mobility under near field conditions of Cl -(van Es et al, 2015), I -, Cs + , (Felipe-Sotelo et al, 2014), Ni 2+ (Felipe-Sotelo et al, 2016a) and SeO3 2-(Felipe-Sotelo et al, 2016b).…”

Section: Introductionmentioning

confidence: 99%