高放废物地质处置关键核素在粘土岩预选区中的迁移模拟研究

Migration Simulation of Geological Disposal of High Level Radioactive Waste At A Key Nuclear Claystone Preselected Area

利用GMS计算了放射性核素Nb-93 m,Se-79,Tc-99,Zr-93,Sn-126在陇东预选区中百万年尺度的污染迁移过程。模拟结果表明:粘土岩由于极低的渗透性和较强的吸附能力,能够有效的阻止核素在围岩中的迁移。其中,迁移距离最大的核素为Se-79,最大迁移距离为242 m,在距泄露点68 m处其活度浓度的峰值为23 000 Bq/l,处置库在百万年内总的活度释放量约为4.3E18Bq,其中起主要贡献的核素是Se-79,其次是Tc-99。

This paper calculated the migration degree of radiation factors of Nb-93 m, Se-79, Tc-99, Zr-93, Sn-126 inLongdong preselected area over one million years with GMS method. The results show that:the low permeability and adoption ca-pacity of claystone can prevent the migration of these ingredients in the surrounding rocks. Among them, Se-79 has the largest radionuclide migration distance of 242 m, the concentration peak is 23000Bq/l at 68 m away from the leak point. Its activity con-centration the repository of the total emission of about million years of activity 4. 3E18Bq, which play a major contribution nuclides Se-79, followed by the Tc-99.