Hydrogeological Environment Evolution And Safety Assessment In A High-Medium Level Radioactive Waste Store

Over the past 30 years,nuclear energy in the world energy mix proportion increases every year because of its efficient and clean features.How to safely and effectively store and dispose of radioactive waste has become a nuclear industry,nuclear science increasingly urgent facing an important research topic.This thesis conducted hydrogeological studies and nuclear plant safety evaluation in a high,medium radioactive waste repository,which has important scientific significance and practical value for China's high-,medium-level waste storage and disposal.High,medium radioactive waste repository evolution hydrogeological conditions were as research subjects in this study,after the building impervious curtain.This study collected sufficient reservoir related geological,seismic,hydrological,environmental,climatic and other data.Reservoir characteristics of the geological environment,hydrogeology and engineering geology,groundwater type,burial conditions and movement characteristics,formation permeability variations,etc.were identified,hydrogeological and environmental conditions,the evolution of the reservoir to the impact of environmental safety were analyzed,by hydrological,geological mapping,hydrogeology and engineering geology drilling,field hydrological testing,geotechnical testing and indoor water chemistry analysis,3D simulation methods.We have achieved the following research results.(1)Groundwater reservoir type,the combination of form storage space,burial and movement of groundwater and aquifer control factors and the spatial distribution of the hydrogeological environment characteristics such as permeability coefficient Quaternary cover layer was revealed through the reservoir geology,hydrogeology and engineering geological conditions and others research.(2)Built before the curtain after the reservoir and groundwater flow field changes after the curtain to build relationships between rainfall reservoir and groundwater levels were studied.Before curtain to build the reservoir seepage and groundwater reservoir after the curtain to build models of groundwater flow field was established through the use of regional geological data and borehole data and Modflow.On this basis,before the curtain was constructed after the curtain was constructed and changes in groundwater flow field dry wet season,heavy rains and other conditions are simulated and analyzed the underlying causes occurred after the curtain to build water events was revealed.(3)Contact hydrodynamic characteristics of the groundwater flow rate of groundwater was studied through the curtain inside and outside the reservoir area water pressure test,pumping test and tracer tests.(4)High and medium level radioactive waste repository in normal operation and safety conditions and extreme weather conditions outside environment is analyzed and evaluated,through long-term monitoring of groundwater level reservoir,after a three-dimensional numerical simulation of groundwater seepage field and hill slope stability and reservoir research.The main innovations are as followings:(1)The first study of the effects of high and medium level radioactive waste repository in the build environment on groundwater seepage curtain,revealing the front curtain and curtain build construction,groundwater environmental evolution process.(2)For the first time carried out a study of groundwater hydrodynamic contact high and put in our waste repository in the field,after the curtain to reveal the construction,inside and outside the groundwater reservoir curtain dynamic contact rule.