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pH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℃、pH值6时平均溶解速率在0.35 g/a左右,120℃、pH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℃、pH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pH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%。
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 pH values,which comes out that dissolution rate is about 0. 35 g / a with 60 ℃ and pH 6,while dissolution rate is about 0. 8 g / a with 120 ℃ and pH 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 pH 8. 5. When considering that the disposal temperature at 60 ℃ and the range of ground water pH is 6—10,the most conservative estimated dissolution load of vitrified HLW is less than 50% over the dimension of 1 million years.
出处
《辐射防护》
CAS
CSCD
北大核心
2016年第1期7-13,共7页
Radiation Protection
基金
国防科工局"十二五"地质处置安全评价技术研究(科工二司(2013)1221号)
