The Migration Characteristics And Configura-Tion Of Uranium In The Natural Geological Environment

Nuclear energy is important for our national development.With the devel-opment of nuclear industry and decommission of a lot of nuclear facilities,there would be a large number of radioactive waste generated,while geological disposal,as a main disposal method,has become research key and difficult points in the field of nuclear science.Uranium as a main and half-life long key element in nu-clear waste cannot be degraded or eliminated by general ways of physical,chemi-cal or biological,it can only rely on radioactive decay itself to gradually reduce the harm,Thus,to consider uranium's migratory behavior in corresponding geo?logical environment is necessary in the early stage of disposal,which can slow down or hold up uranium entering biosphere and guarantee safe of technology of waste disposal in stipulated date.In order to master migration behavior characteristics of uranium in geological environment,the essay studies migration characteristics and laws of uranium in geological environment by support of national defense scientific research project and taking.preselected site geological environment of a waste repository in Southwest as research object,the research achievements would provide technical reference for establishment of geological repository of nuclear waste.Main re-search topics are as follows:(1)Studying adsorption behavior and impact characteristics of uranium in earth through static adsorption experiment,inspect-ing influence of time,geological medium particle size,temperature,pH,carbonate,and concentration on adsorption.(2)Studying migratory behavior of uranium in earth by dynamic leaching experiment,evaluating soil's retaining performance for uranium?(3)Calculation and analysis on chemical speciation and distribution characteristics of uranium in underground water by PHREEQC,acquiring migra-tion state of uranium in underground water?(4)Adopting GMS groundwater numerical simulation software and simulating migration process of uranium in geological environment within 300a to reveal migration behavior characteristics of uranium in geological environment of repository sites...