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首页> 外文期刊>Nuclear Technology >A MODELING STUDY EVALUATING THE THERMAL-HYDROLOGICAL CONDITIONS IN AND NEAR WASTE EMPLACEMENT DRIFTS AT YUCCA MOUNTAIN
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A MODELING STUDY EVALUATING THE THERMAL-HYDROLOGICAL CONDITIONS IN AND NEAR WASTE EMPLACEMENT DRIFTS AT YUCCA MOUNTAIN

机译：尤卡山山中及附近垃圾迁移巷道水热状况的模型研究

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In heated drifts such as those designated for emplacement of radioactive waste at the proposed geologic repository at Yucca Mountain, temperature gradients cause natural-convection processes that may significantly influence the moisture conditions in the drifts and in the surrounding fractured rock. Large-scale convection cells in the heated drifts would provide an effective mechanism for turbulent mixing and axial transport of vapor generated from evaporation of pore water in the nearby formation. As a result, vapor would be transported from the elevated-temperature sections of the drifts into cool end sections (where no waste is emplaced), would condense there, and subsequently would drain into underlying rock units. To study these processes, we have developed a new simulation method that couples existing tools for simulating thermal-hydrological conditions in the fractured formation with a module that approximates turbulent natural convection in heated emplacement drifts. The new method simultaneously handles (a) the flow and energy transport processes in the fractured rock, (b) the flow and energy transport processes in the cavity, and (c) the heat and mass exchange at the rock-cavity interface. An application is presented studying the future thermal-hydrological conditions within and near a representative waste emplacement drift at Yucca Mountain. Particular focus is on the potential for condensation along the emplacement section, a possible result of heat output differences between individual waste packages.
机译：在热漂流中，例如那些拟在尤卡山拟议地质处置库中放置放射性废物的漂流中，温度梯度会导致自然对流过程，这可能会严重影响漂流中以及周围裂隙岩石中的水分条件。加热的漂移中的大型对流单元将为湍流混合和轴向传输由附近地层中孔隙水蒸发产生的蒸气提供有效的机制。结果，蒸气将从漂流的高温部分输送到凉爽的末端部分（不放置废物），在那儿冷凝，然后排入下面的岩石单元。为了研究这些过程，我们开发了一种新的模拟方法，该方法将用于模拟裂缝地层中的热水文条件的现有工具与一个近似模块，该模块可以模拟加热位置漂移中的湍流自然对流。新方法同时处理（a）裂隙岩石中的流动和能量传输过程，（b）空腔中的流动和能量传输过程，以及（c）岩石-空腔界面处的热量和质量交换。提出了一个应用程序，用于研究尤卡山有代表性的废物安置漂移内及其附近的未来热水文条件。特别要注意的是沿放置区可能产生冷凝，这是各个废物包装之间的热量输出差异的可能结果。

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