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首页> 外文期刊>Annals of nuclear energy >ASSESSMENT OF WATER-FILLED BOREHOLE AS A PREFERRED PATHWAY PENETRATING RADIOACTIVE WASTE REPOSITORY
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ASSESSMENT OF WATER-FILLED BOREHOLE AS A PREFERRED PATHWAY PENETRATING RADIOACTIVE WASTE REPOSITORY

机译：充水钻孔作为穿透放射性废物处置库的首选途径的评估

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摘要

This paper discusses the effect of human intrusion into the repository for radioactive wastes. It has been numerously suggested that an inadvertent direct drilling at the repository could provide a pathway for the release of radionuclides immobilized in waste forms even with its low occurrence probability. The diffusive mass transport in the water-filled borehole is modeled accounting for diffusion out of the waste forms and into the rock. The fully implicit integrated finite difference method is used to obtain the solution and is compared with the numerical inversion of Laplace transform method. One interesting finding is that the diffused radionuclides from the waste forms do not diffuse farther in the borehole due to low concentration gradient in early time and rock matrix diffusion so long as the borehole is not pumped continuously. The results show that the releases of radionuclides through the borehole pathway are insignificant even though the concentrations of radionuclides released into the borehole water exceed the MPC. It is shown that the model developed here could also be applied to the drilling at a non-cylindrically shaped repository and to the off-center drilling of the cylindrical repository unless the drilling occurred near the repository boundary.
机译：本文讨论了人类入侵放射性废物处置库的影响。大量建议指出，即使在处置库中发生意外事故的可能性很小，在处置库中无意中进行的直接钻探也可以为释放固定在废物形式中的放射性核素提供途径。对充满水的井眼中的扩散物质传输进行了建模，考虑了从废物形式扩散到岩石中的扩散。使用完全隐式积分有限差分法获得解，并将其与拉普拉斯变换法的数值反演进行比较。一个有趣的发现是，由于早期的低浓度梯度和岩石基质的扩散，只要不连续泵送钻孔，从废物形式中扩散的放射性核素就不会在钻孔中进一步扩散。结果表明，即使释放到井眼水中的放射性核素浓度超过了MPC，通过井眼路径释放的放射性核素也微不足道。结果表明，这里开发的模型还可以应用于非圆柱形储层的钻探，以及圆柱形储层的偏心钻，除非钻探发生在储层边界附近。

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