Department of Chemistry, The University of Western Ontario , London, Ontario N6A 5B7, Canada.
Surface Science Western, The University of Western Ontario , London, Ontario N6G 0J3, Canada.
Environ Sci Technol. 2016 Nov 15;50(22):12348-12355. doi: 10.1021/acs.est.6b04167. Epub 2016 Oct 25.
A 2-D model for the corrosion of spent nuclear fuel inside a failed nuclear waste container has been modified to determine the influence of various redox processes occurring within fractures in the fuel. The corrosion process is driven by reaction of the fuel with the dominant α radiolysis product, HO. A number of reactions are shown to moderate or suppress the corrosion rate, including HO decomposition and a number of reactions involving dissolved H produced either by α radiolysis or by the corrosion of the steel container vessel. Both sources of H lead to the suppression of fuel corrosion, with their relative importance being determined by the radiation dose rate, the steel corrosion rate, and the dimensions of the fractures in the fuel. The combination of H from these two sources can effectively prevent corrosion when only micromolar quantities of H are present.
一个用于模拟乏核燃料在失效核废料容器内腐蚀的二维模型已经过修改，以确定燃料裂缝内发生的各种氧化还原过程的影响。腐蚀过程是由燃料与主要的α辐射分解产物 HO 反应驱动的。许多反应被证明可以调节或抑制腐蚀速率，包括 HO 的分解以及一些涉及溶解 H 的反应，这些 H 要么是由α辐射产生的，要么是由钢容器的腐蚀产生的。这两种 H 的来源都导致了燃料腐蚀的抑制，它们的相对重要性取决于辐射剂量率、钢的腐蚀速率以及燃料裂缝的尺寸。当只有毫摩尔数量的 H 存在时，这两种来源的 H 的组合可以有效地防止腐蚀。
