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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Specific outcomes of the research on the spent fuel long-term evolution in interim dry storage and deep geological disposal
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Specific outcomes of the research on the spent fuel long-term evolution in interim dry storage and deep geological disposal

机译：临时干法贮存和深部地质处置中乏燃料长期演变的研究的具体成果

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This paper presents an overview of the main results of the French research on the long-term evolution of spent fuel. The behavior of the spent fuel rods in the various conditions likely to be encountered during dry storage and deep geological disposal, i.e., in a closed system, in air and in water were investigated. It appears that in a closed system the effects of helium production on the mechanical stability of grain boundaries remain the major unanswered question. In air, microscopic characterization of the UO2 oxidation leads to introduce a new phase in the classical oxidation scheme. The limiting step assumption on which the oxidation kinetics are based is only partially valid. In water, the effect of the alpha radiolysis which accelerates UO2 dissolution was demonstrated for anoxic conditions. However this effect could be counteracted by the environmental conditions, such as the presence of H, produced by the container corrosion. The effects of the environmental parameters on the fuel matrix dissolution still need to be assessed. (c) 2006 Elsevier B.V. All rights reserved.
机译：本文概述了法国对乏燃料的长期演变研究的主要成果。研究了乏燃料棒在干燥存储和深层地质处置过程中可能遇到的各种条件下的行为，即在密闭系统中，在空气和水中。似乎在一个封闭的系统中，氦产生对晶界机械稳定性的影响仍然是主要的未解决问题。在空气中，UO2氧化的微观表征导致在经典氧化方案中引入新的相。氧化动力学所基于的限制步骤假设仅部分有效。在缺氧条件下，已证明了在水中的α放射分解能加速UO2溶解。但是，这种影响可以被环境条件所抵消，例如容器腐蚀产生的H的存在。环境参数对燃料基质溶解的影响仍然需要评估。 （c）2006 Elsevier B.V.保留所有权利。

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