The effect of the evolution of environmental conditions on the corrosion evolutionary path in a repository for spent fuel and high-level waste in Opalinus Clay

Johnson, L. H.; King, Fraser

doi:10.1016/j.jnucmat.2008.06.003

Cited by 45 publications

(27 citation statements)

References 7 publications

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“…Similarly, 1 mol of gaseous hydrogen sulphide (H 2 S) and 2 mol of CO 2 are produced by SRB per 1 mol of reduced sulphate with acetate as electron donor. Note, however, that the inventory of gases in a repository will depend on the amount of the available solution, as at temperatures and pressures relevant for a repository after the re-establishing of clay saturation (which can take a couple of centuries; Johnson & King 2008), about 1 mol of H 2 S and 1 mol of CO 2 can be dissolved per kilogram of pore solution (Duan et al 2006(Duan et al , 2007.…”

Section: Microbial Gas Production and Conversionmentioning

confidence: 99%

Microbial processes relevant for the long-term performance of high-level radioactive waste repositories in clays

Meleshyn

2014

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The primary purpose of the present work was to qualitatively evaluate the relevance of microbial activity for the long-term performance of a deep geological repository for high-level radioactive waste and spent nuclear fuel utilizing clay and to identify which safety-relevant processes and properties can be potentially influenced by this activity. Deterioration of clay properties accompanying destabilization and destruction of clay mineral structure as a result of microbial actions can be considered as the primary microbial impact on clay. The present analysis identified eight clay properties essential for maintaining safety functions of containment and retardation of the disposal system -swelling pressure, specific surface area, cation exchange capacity, anion sorption capacity, porosity, permeability, fluid pressure and plasticity -which can potentially be influenced by microbial processes in clay-based materials and claystone within a repository. Radioactive waste canisters and over-packs made from cast metal or steel represent a further component of the engineered barrier system which can be strongly affected by microbial activity in the clay buffer or in the adjacent host rock. This work should provide a basis for a follow-up quantitative estimation of the maximum possible effects of microbial processes on the barrier system of a deep geological repository in clay.

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Section: Microbial Gas Production and Conversionmentioning

confidence: 99%

Microbial processes relevant for the long-term performance of high-level radioactive waste repositories in clays

Meleshyn

2014

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“…The slope of the current density curve is more important with Mag-Na than Mos-Na. Clay aggressiveness has been in fact reported by some authors [10,24]. It must be due to the dissolution without precipitation of iron in the clay.…”

Section: F Arbaoui Et Al J Fundam Appl Sci 2017 9(3) 1300-1319 1305mentioning

confidence: 91%

“…Sci. 2017, 9(3), [1300][1301][1302][1303][1304][1305][1306][1307][1308][1309][1310][1311][1312][1313][1314][1315][1316][1317][1318][1319] . The electrode is maintained horizontally in order to ensure the firmness of the Working electrode made of carbon steel covered by bentonite.…”

Section: Methodsmentioning

confidence: 99%

Corrosion of a carbon steel covered by treated bentonites in aqueous solution

Arbaoui

Amzert

Boucherit

2017

J. Fundam and Appl Sci.

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In the present work we realised an electrochemical system for steel/clay/aqueous solutions study. Two Algerian bentonites have been considered. The obtained results show that both clays are corrosive even in the absence of chloride ions. We show that this corrosiveness is related to the cationic exchange capacity (CEC). The chemical treatment of clays by tungstate reduces significantly their CEC and corrosiveness. Electrochemical impedance spectroscopy results prove that tungstate reduces iron and chlorides ions transport through the clay. This deduction is supported also by microscopic observations.

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“…During storage, the oxygen content in the soil will decrease, since the site was exposed to atmosphere when the waste was buried, but then oxygen consumed during underground storage will not be replenished from the atmosphere. This results in a change from aerobic to anaerobic conditions [6] and a subsequent change in the corrosion mechanism with time [7]. Figure 1 illustrates how the water vapor pressure in the clay increases due to the decrease in the capillary pressure in the surrounding clay as the temperature decreases during storage.…”

Section: Waste Storage Strategiesmentioning

confidence: 99%

Corrosion in Nuclear Waste Containers

Fergus

2013

ECS Trans.

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One of the challenges for the continued use and expansion of nuclear power generation is the disposal of radioactive waste materials. The long lifetimes require the identification of stable geological formations with non-aggressive environments, combined with engineered multi-barrier containment systems. In this paper, the corrosion behavior of alloys used in containment systems for storage of nuclear waste in geological sites will be reviewed.

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The effect of the evolution of environmental conditions on the corrosion evolutionary path in a repository for spent fuel and high-level waste in Opalinus Clay

Cited by 45 publications

References 7 publications

Microbial processes relevant for the long-term performance of high-level radioactive waste repositories in clays

Microbial processes relevant for the long-term performance of high-level radioactive waste repositories in clays

Corrosion of a carbon steel covered by treated bentonites in aqueous solution

Corrosion in Nuclear Waste Containers

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