Mechanisms of Leaching and Dissolution of UO2 Fuel
Mechanisms of Leaching and Dissolution of UO2 Fuel
复制标题
UO2燃料的浸出和溶解机理
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
P. Tremaine
中科院分区：
文献类型：
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作者：
L. Johnson;D. Shoesmith;G. Lunansky;M. G. Bailey;P. Tremaine
介绍了一种研究辐照过的UO2燃料浸出和溶解机理的综合实验方法。该计划包括一个调查的溶解度的二氧化铀矩阵在化学定义良好的条件下，详细测量的浸出和溶解的辐照燃料在模拟处置条件下，和电化学测量与一种新的二氧化铀电极，以阐明溶解机制。初步实验表明，在碱性还原条件下，二氧化铀的溶解度对温度变化相对不敏感，辐照燃料的浸出率也与温度关系不大，二氧化铀燃料上的表面膜可能在溶解过程中发挥重要作用。二氧化铀基质溶解过程的几个方面现已得到了解，所采取的方法表明了今后需要开展的工作。
An integrated experimental approach to mechanistic studies of the leaching and dissolution of irradiated UO2fuel is described. The program includes an investigation of the solubility of the UO2 matrix under thermodynamically well-defined conditions, detailed measurements of the leaching and dissolution of irradiated fuel under simulated disposal conditions, and electrochemical measurements with a novel UO2 electrode to elucidate dissolution mechanisms. Initial experiments show that the solubility of UO2 under alkaline reducing conditions is relatively insensitive to temperature changes, that the leach rates of irradiated fuel are also not strongly temperature dependent, and that surface films on the UO2 fuel may play an important role in the dissolution process. Several aspects of the UO2 matrix dissolution process are now understood, and the approach taken has indicated where future work is needed.