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首页> 外文期刊>Nuclear Technology >LONG-TERM SAFETY ASSESSMENT OF A (NEAR-SURFACE) SHORT-LIVED RADIOACTIVE WASTE REPOSITORY IN LITHUANIA
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LONG-TERM SAFETY ASSESSMENT OF A (NEAR-SURFACE) SHORT-LIVED RADIOACTIVE WASTE REPOSITORY IN LITHUANIA

机译：立陶宛（近地面）短寿命放射性废物处置库的长期安全性评估

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摘要

The paper presents the long-term safety assessment of the Maisiagala radioactive waste repository (Lithuania) using the advanced computer codes DUST, FE-FLOW, and AMBER. The software DUST was employed for calculations of the one-dimensional leaching flux of radionuclides from the repository vault and subsequent transport in the unsaturated zone. Using the mass flux of radionuclides calculated in DUST as a source to the aquifer, the software FEFLOW was used for two-dimensional assessment of activity concentrations of radionuclides in groundwater. Using the ground-water concentrations calculated in FEFLOW, the code AMBER was used to calculate the dose over time at four hypothetical wells downstream from the repository. The well distances ranged from 150 to 1600 m. When the hypothetical drinking water well is installed 150 m from the repository (close to the outside perimeter of the controlled area), the highest effective doses will arise from ~3H, ~(36)Cl, and ~(239)Pu. The doses determined by ~3H and ~(36)Cl may exceed a dose limit of 1 mSv/yr for 50 to 230 yr after the closure of the facility (1989). The dose of ~(239)Pu will remain almost constant for > 60 000 yr after the closure, yet it will not exceed the dose limit value. According to previous studies, the intrusion scenario is much more critical compared to the groundwater exposure pathway in the case of ~(239)Pu (as well as ~(226)Ra).
机译：本文介绍了使用先进的计算机代码DUST，FE-FLOW和AMBER对Maisiagala放射性废物处置库（立陶宛）进行的长期安全评估。使用软件DUST计算了来自储存库的一维放射性核素的一维浸出通量，以及随后在非饱和区的传输。使用在DUST中计算的放射性核素质量通量作为含水层的来源，软件FEFLOW用于二维评估地下水中放射性核素的活动浓度。使用FEFLOW中计算出的地下水浓度，使用代码AMBER计算随时间推移在处置库下游的四个假设井处的剂量。井距范围为150至1600 m。当假设的饮用水井距储存库150 m（靠近受控区域的外围）安装时，最高有效剂量将来自〜3H，〜（36）Cl和〜（239）Pu。设施关闭后，〜3H和〜（36）Cl确定的剂量在50至230年内可能超过1 mSv / yr的剂量极限。封闭后〜（239）Pu的剂量将在> 60 000 yr内保持几乎恒定，但不会超过剂量极限值。根据先前的研究，在〜（239）Pu（以及〜（226）Ra）的情况下，与地下水暴露途径相比，入侵情景更为关键。

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