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Modeling radionuclide migration from activated metallic waste disposal in a generic geological repository in Lithuania
Nuclear Engineering and Design ( IF 1.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.nucengdes.2020.110885
Dalia Grigaliūnienė , Robertas Poškas , Raimondas Kilda , Hussam Jouhara , Povilas Poškas

Abstract There are two RBMK-1500 type reactors in Lithuania, which are under decommissioning now. Long-lived low and intermediate level radioactive metallic waste generated during operation and decommissioning of the nuclear power plant is foreseen for deep geological disposal (DGR). A preliminary assessment of the radionuclide release from metallic waste and migration through the engineered barriers of the generic DGR in crystalline rocks is presented in this study. The radionuclide flux to backfill and geosphere is investigated for three different container alternatives: (1) disposal of metallic waste in stainless steel containers, (2) disposal in carbon steel containers and (3) disposal in which the container is not a barrier for radionuclide migration. In addition, the impact of surface contamination of the activated waste on the radionuclide flux is investigated. Comparison of maximum fractional flux to backfill between Alternatives 1 and 2 revealed that the container material plays a noticeable role in the migration of long-lived low mobility radionuclides. The maximum fractional flux to the geosphere for all radionuclides increases from Alternative 1 to Alternative 3. Surface contamination is an important parameter when the maximum radionuclide flux to backfill is observed during the early post-closure period.

中文翻译:

模拟来自立陶宛通用地质处置库中活化金属废物处置的放射性核素迁移

摘要 立陶宛有两座RBMK-1500型反应堆正在退役。预计核电厂运行和退役期间产生的长寿命中低放射性金属废物将用于深部地质处置 (DGR)。本研究介绍了对金属废物中放射性核素释放和通过一般 DGR 工程屏障在结晶岩中迁移的初步评估。研究了三种不同容器替代方案的回填物和地球圈的放射性核素通量:(1)在不锈钢容器中处置金属废物,(2)在碳钢容器中处置和(3)在容器不是放射性核素屏障的处置中移民。此外,研究了活化废物的表面污染对放射性核素通量的影响。替代方案 1 和 2 之间回填的最大部分通量的比较表明,容器材料在长寿命低迁移率放射性核素的迁移中起着显着的作用。所有放射性核素进入地球圈的最大部分通量从备选方案 1 增加到备选方案 3。当在关闭后早期观察到回填的最大放射性核素通量时,地表污染是一个重要参数。
更新日期:2020-12-01
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