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首页> 外文会议>9th International Conference on Environmental Remediation and Radioactive Waste Management >THE IMPORTANCE OF GEOCHEMICAL CHARACTERIZATION OF REPOSITORY HOST HORIZIONS FOR RADIOACTIVE WASTE DISPOSAL: SALIGNY REPOSITORY SITE FOR L/ILW, ROMANIA
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THE IMPORTANCE OF GEOCHEMICAL CHARACTERIZATION OF REPOSITORY HOST HORIZIONS FOR RADIOACTIVE WASTE DISPOSAL: SALIGNY REPOSITORY SITE FOR L/ILW, ROMANIA

机译：放射性废料处置中处置场所水平的地球化学特征的重要性：罗马尼亚L / ILW的萨利尼处置场

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The Saligny Site, situated in the vicinity of the Cernavoda Nuclear Power Plant in Romania, has been chosen as a repository site for placement of future Low and Intermediate Level Nuclear Waste. Scientific investigations are on going to help assess the long-term performance of the nuclear waste repository and include the development of a site conceptual model, geochemical characterization of the proposed liner material and the geologic formations surrounding the repository. Geochemical characteristics of the proposed waste site and of repository liner material are essential information in providing key model parameters needed to determine the mechanisms and rates for the potential release and transport of radionuclides in the environment. A series of laboratory sorption and diffusion experiments in support of the site conceptual model were run at Los Alamos National Laboratory, USA and Institute for Nuclear Research, Romania. These experiments compared responses of cesium-137 and tritiated water as radionuclides, and included natural soil samples from Saligny site and cement liner material. Sorption experiments focused on studying the affinity of cesium-137 for soil samples from: a clay rich loess horizon, a compacted red clay horizon and a Portland type cement, proposed as liner for the repository. A Saligny synthetic water was used for the soil sorption experiments. For the cement sorption and diffusion experiments, NaCl 10mM water was necessary in order to avoid insolubility problems at the high pH (around 12) when in contact with the cement. Preliminary studies of the geochemistry for radionuclide-soil matrix and radionuclide-concrete liner interactions were obtained through the sorption and diffusion experiments. The sorption isotherms were linear for all samples with high Kd values for soil samples and low values for the cement. Mineralogical information obtained through quantitative X-ray diffraction (QXRD) analysis, for the studied soil samples were in agreement with the sorption results. The high amount of clay present in the soil samples was determined to be the main contributor for the strong sorption. Diffusion cells were prepared for comparing hydrologic response characteristics for tritiated water and cesium-137, through the measurement of diffusion coefficients as influenced by the soil and cement matrices. Tritiated water and cesium-137 diffusion coefficients were determined from the change in radionuclide concentration profile over time while diffusing through the soil or cement matrix, and were found in agreement with the values listed in literature findings.
机译：位于罗马尼亚Cernavoda核电厂附近的Saligny厂址已被选为存放未来中低水平核废料的仓库。正在进行科学研究，以帮助评估核废料储存库的长期性能，包括开发场地概念模型，提议的衬里材料的地球化学特征以及储存库周围的地质构造。建议的废物场和储存库衬里材料的地球化学特征是提供关键模型参数所必需的重要信息，这些参数需要确定环境中放射性核素的潜在释放和运输的机制和速率。在美国洛斯阿拉莫斯国家实验室和罗马尼亚核研究所进行了一系列实验室吸附和扩散实验，以支持现场概念模型。这些实验比较了铯137和tri化水作为放射性核素的响应，并包括来自Saligny场地和水泥衬里材料的天然土壤样品。吸附实验的重点是研究铯137与土壤样品的亲和力，这些土壤样品来自：富含粘土的黄土层，压实的红色粘土层和波特兰型水泥，被建议用作储层的衬层。 Saligny合成水用于土壤吸附实验。对于水泥的吸附和扩散实验，必须使用10mM的氯化钠水，以避免与水泥接触时在高pH（约12）下的不溶性问题。通过吸附和扩散实验获得了对放射性核素-土壤基质和放射性核素-混凝土衬里相互作用的地球化学的初步研究。所有样品的吸附等温线都是线性的，其中土壤样品的Kd值高，而水泥样品的Kd值低。通过定量X射线衍射（QXRD）分析获得的矿物学信息与所研究的土壤样品的吸附结果一致。确定存在于土壤样品中的大量粘土是强吸附作用的主要贡献者。通过测量受土壤和水泥基质影响的扩散系数，制备了扩散池，用于比较ti化水和铯137的水文响应特性。 radio水和铯137的扩散系数是根据放射性核素在土壤或水泥基质中扩散时随时间变化的放射性核素浓度分布图确定的，与文献中列出的值相符。

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