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Environmental behaviors of spent nuclear fuel and canister materials
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2011 (English)In: Energy & Environmental Science, ISSN 1754-5692, Vol. 4, no 7, 2537-2545 p.Article in journal (Refereed) Published
Abstract [en]

The world's first spent nuclear fuel repository concept (Swedish KBS-3) is illustrated and the results of experiments on environmental behaviors of spent fuel and canister materials under a potential canister breaching at early stage of disposal are reported. In a deoxygenated synthetic groundwater (2 mM NaHCO(3)) under radiation (gamma 0.9 Gy h(-1)), inventory fraction leaching rates of fission-products ((137)Cs, (90)Sr and (99)Tc) and actinides ((238)U, (237)Np) from a spent fuel segment were found to be around 10(-6) and 10(-7) per day, respectively. A cast-iron canister surface was found to be able to immobilize (238)U, (90)Sr, (99)Tc and (237)Np dissolved from spent fuel, but a copper surface could not. In the presence of the oxidative species generated from water radiolysis, the corrosion rates of waste canister materials, copper and cast-iron were found to be 1 and 30 mm per year, respectively. The observation of insignificant dissolution of spent fuel in the leaching solution equilibrated with 0.1 atm H(2) is explained by the reducing effects of H(2) in the presence of fission-product alloy particles (Mo-Tc-Ru-Rh-Pd) as catalysts and dissolved Fe(II) in groundwater. The coating effect of ferric precipitates on spent nuclear fuel dissolution is also discussed.

Place, publisher, year, edition, pages
2011. Vol. 4, no 7, 2537-2545 p.
National Category
Chemical Sciences
URN: urn:nbn:se:su:diva-66986DOI: 10.1039/c0ee00582gISI: 000292205100024OAI: diva2:470060
authorCount :3Available from: 2011-12-28 Created: 2011-12-22 Last updated: 2011-12-28Bibliographically approved

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Cui, Daqing
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