【摘要】 对高放玻璃固化体在地质处置过程中由于地下水的侵蚀而导致玻璃体溶解的溶解机理进行了分析,利用水解反应动力学模型对不同温度、不同p H条件下的玻璃固化体溶解速率进行了计算。计算结果表明:玻璃在酸性或高温情况下溶解速率较大,60℃、p H值6时平均溶解速率在0.35 g/a左右,120℃、p H值8.5时平均溶解速率在0.8 g/a左右;在100万年这个时间尺度上,120℃、p H值8.5时玻璃的最大溶解量是80%。考虑到地下处置库中温度一般要低于60℃,地下水的p H值范围在6~10,所以最保守估计100万年玻璃固化体的溶解侵蚀分数不大于50%。更多还原

【Abstract】 The mechanism of vitrified HLW dissolution due to ground water erosion in the process of geological disposal is analyzed. Through hydrolysis reaction kinetics,dissolution rate of vitrified HLW is calculated with different temperatures and p H values,which comes out that dissolution rate is about 0. 35 g / a with 60 ℃ and p H 6,while dissolution rate is about 0. 8 g / a with 120 ℃ and p H 8. 5; and it can be concluded that there may be a trend for dissolution rate of vitrified HLW that increases with temperatures and acidity. Among the dimension of 1 million years,the maximum dissolution load of HLW vitrified waste is 80% with 120 ℃ and p H 8. 5. When considering that the disposal temperature at 60 ℃ and the range of ground water p H is 6—10,the most conservative estimated dissolution load of vitrified HLW is less than 50% over the dimension of 1 million years.更多还原