地下水穿透情形下玻璃固化体的蚀变研究

玻璃固化体在高放废物处置库中的长期处置行为，是处置库安全评价的关键环节之一。本研究模拟极端情形下，地下水穿透包装容器与固化体接触后，固化体中元素的浸出和蚀变行为。结果表明，地下水与固化体接触后，各元素的浸出浓度迅速增大，在200 d后逐渐下降并趋于稳定；温度对固化体中不同元素浸出速率的影响不同，B和Si的浸出速率随温度的增加而增大，U和Re的浸出速率随温度的降低而增大；固化体蚀变程度随温度的升高而加重，但其蚀变层的形成会阻滞元素在其中的扩散，客观上降低了固化体蚀变速率；富Si处置环境有利于抑制固化体中元素的浸出。

Study on Alteration of HLW Glass in Scenario of Underground Water Crossing Canister

The long-term disposal behavior of HLW glass is a key point in HLW safe disposal process. In this study, the leaching behavior and the corrosion behavior of HLW glass were studied in the scenario of underground water crossing canister. The results show that the leaching concentration of elements increases quickly in initial period and then decreases and becomes stable after 200 days. The effects of temperature on leaching rate are different for different elements. The leaching rate of B and Si increases with temperature while the leaching rate of U and Re decreases. The alteration of glass becomes severer with the increase of temperature, but as the elements in glass enter the underground water by diffusing through the layer, the alter-layer can lower the corrosion rate. The rich silicon environment is beneficial to inhibit the leaching of elements.