摘要
Abstract
According to the dual continuous medium model,the nuclide transport equations of fissure and matrix are derived in parallel plate single fractured granite based on the nuclide migration rule in this paper,the relative concentrations of nuclide are obtained in fissure and matrix.The 239Pu(Ⅳ) is selected as the simulation subject,the distributions of relative concentration are analyzed in granite fissure and matrix of the study region,combined with the permeability coefficient,the partition coefficient and other parameters of the study region,and the developing trend and migration of 239Pu(Ⅳ) are predicted in fissure and matrix.The simulation shows that this diffusion velocity of 239Pu(Ⅳ) is very slow,the range of diffusion is only millimeter level after 0.5 × 105 a in matrix,but it is 3 m in fissure.The result shows that this area of the granite meets the condition of radioactive waste disposal containing 239Pu(Ⅳ) etc.At the same time,the rule of the nuclides migration is discussed due to the variation of some parameters in the fissure,including the average speed of fissure water,gap width,permeability coefficient,radionuclide half-life,retardation factor in matrix and fissure etc.关键词
239Pu(Ⅳ)/花岗岩裂隙/核素迁移/数值模拟Key words
239Pu(Ⅳ)/granite fissure/ radionuclide migration/ numerical simulation分类
能源科技
