Long-term Environmental Assessment of Waste from PyroGreen System

Procedia Chemistry Pub Date : 2016-01-01 DOI:10.1016/j.proche.2016.10.059

Heejae Ju, Inhye Hahm, Sungjune Sohn, Il Soon Hwang

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引用次数: 2

Abstract

We have conducted a long-term environmental assessment of a geological repository for Intermediate Level Wastes (ILW) arising from PyroGreen processes that has been developed to decontaminate all HLW from the pyrochemical partitioning of spent nuclear fuels (SNF). PyroGreen process has been designed so that final ILW can meet conservative acceptance criteria such as one established for the Waste Isolation Pilot Plant (WIPP) in U.S.A. The nuclide inventory of final vitrified PyroGreen waste is calculated using ORIGEN 2.1 based on the design decontamination factor of PyroGreen processes applied to 18,171 metric tons of PWR SNF with 45 GWD/MTU burnup. Using GoldSim model, the environmental impact of ILW upon geological disposal at an intermediate depth. Among radioactive nuclides, Ra226, Rn222 and Sn126 are identified as key contributors to radiological dose for general public. The environmental impact of PyroGreen wastes satisfies the Korean dose limit of 0.1 mSv/year with sufficiently high margin. Sensitivity studies have shown that the predicted dose can vary significantly by distribution coefficient of Ra226 and Rn222, solubility limit of Se79.

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焦绿系统废弃物的长期环境评价

我们对一个存放由热释绿过程产生的中间水平废物(ILW)的地质储存库进行了长期环境评估，该储存库已被开发用于清除乏核燃料(SNF)的热化学分区所产生的所有高放射性废物。设计了PyroGreen过程，使最终的ILW能够满足保守的验收标准，例如为美国废物隔离中试工厂(WIPP)建立的标准。最终玻璃化的PyroGreen废物的核素库存是使用ORIGEN 2.1计算的，该计算基于适用于18171公吨压水堆SNF、45 GWD/MTU燃耗的PyroGreen过程的设计去污染系数。利用GoldSim模型，研究了中等深度的ILW对地质处置的环境影响。在放射性核素中，Ra226、Rn222和Sn126被确定为公众辐射剂量的主要贡献者。焦绿废弃物对环境的影响满足我国0.1毫西弗/年的剂量限值，裕度足够高。敏感性研究表明，Ra226和Rn222的分布系数、Se79的溶解度极限对预测剂量有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Procedia Chemistry

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