Interaction Between Hyperalkaline Fluids and Rocks Hosting Repositories for Radioactive Waste: Reactive Transport Simulations
Interaction Between Hyperalkaline Fluids and Rocks Hosting Repositories for Radioactive Waste: Reactive Transport Simulations
复制标题
超碱性流体与放射性废物储存库岩石之间的相互作用：反应输运模拟
DOI：
10.13182/nse05-a2535
复制
发表时间：
2005
影响因子：
1.2
通讯作者：
U. Mäder
中科院分区：
文献类型：
--
作者：
J. Soler;U. Mäder
摘要模拟水泥降解产生的超碱性溶液与中低放废物处置库潜在寄主岩石之间的相互作用，进行了反应输运计算。显示了两种不同的情况：（a）计划在韦伦贝格建立的储存库的例子和（B）在格里姆塞尔试验场建立的全球技术服务-HPF试验模型。GIMRT代码已被用于模拟。矿物反应由动力学速率定律描述。原生矿物的反应速率是基于文献中公布的实验确定的速率和几何考虑与矿物表面积的测量相结合。对次生矿物采用了相对较快的速率，因此结果类似于这些矿物的局部平衡解。在这两种情况下，岩石的改变和次生相的沉淀会导致系统渗透性的降低，这实际上对处置库的性能是有益的。矿物表面积在很大程度上控制着矿物蚀变的量和渗透率的变化。
Abstract Reactive transport calculations simulating the interaction between hyperalkaline solutions derived from the degradation of cement and potential host rocks for repositories for low- and intermediate-level radioactive waste have been performed. Two different cases are shown: (a) The example of the planned repository at Wellenberg and (b) the modeling of the GTS-HPF experiment at the Grimsel Test Site. The GIMRT code has been used for the simulations. Mineral reactions are described by kinetic rate laws. The reaction rates for the primary minerals are based on experimentally determined rates published in the literature and geometric considerations combined with measurements regarding mineral surface areas. Relatively fast rates for the secondary minerals have been used, so the results resemble the local equilibrium solution for these minerals. In both cases, the alteration of the rock and the precipitation of secondary phases cause a reduction in the permeability of the system, which would actually be beneficial for the performance of a repository. Mineral surface area controls, to a large extent, the amount of mineral alteration and the change in permeability.