Research Of Influence Of Accident In The Inland Nuclear Power Plant Of Taohuajiang On Underground Water Resources

At present time,the atmospheric environment in our country suffered an unprecedented pressure,the nuclear plant has become the focus engineering of the national energy strategy becausrof its cleanness and reliablility.The rapid development of nuclear plant will make a big difference to energy supplies and security,environment protection for our country,as well as optimize the electric power industry structure and realize sustainable development.However,inland nuclear power stations were mostly built near the river.In the event of a serious accident,it will have serious consequences for society and ecological environment,especially for ground and degroung water resources.Due to the slow flow velocity of groundwater,leak of nuclide once flow in groundwater,it will make a long-term influence on the regional groundwater resources,which will generate a series of permanent negative effects in turn.So,it should be taken into our consideration seriously.To sum up,according to the actual condition of the nuclear power plant,this paper studied on the ways of the nuclide leaking into groundwater and the influence degree to groundwater.It will have important significance to scientific disposal of nuclear accidents.Based on the inland nuclear power station named Taohuajiang as the research object,and adsorption property of nuclide and seepage theory of fractured rock mass,the paper adopts the numerical simulation platform of finite difference and finite element,makes some numerical simulation research on seepage of rock mass and radionuclide migration in the vadose zone and saturated zone for Taohuajiang nuclear power plant.The main research contents and achievements include the following aspects:1,The paper summarized fomer research methods about different nuclide migration in the rock mass and groundwater by widely studing literature,summarized the different nuclide adsorption and adsorption mode selection,revealed the influence mechanism of nuclear power plant accident to groundwater.2,The paper analyzed engineering geological and hydrogeological conditions in the researching area,determined the geological structure and conditions of groundwater system,including recharging,runoff and discharging in the study area.All of this made a foundation to establish a three-dimensional geological coupling numerical model of groundwater.Then,the paper calculated and analysed the groundwater flow field,generalized the three ways of nuclide flowing into groundwater.3,Chosing the condition of radioactive effluent boxes bursting and liduid flowing into groundwater directly as the limites accident condition,the paper studied the nuclide migration regular in vadose zone and saturated zone with two conditions of point source and area source.For research we select 4 kinds radionuclide of ¹³⁷Cs,⁹⁰Sr,⁶⁰Co and ³H.4,The paper selected ⁹⁰Sr as representativefor parameter sensitivity analysis,the introduced sensitive index L as a unified quantization index,then analysed the sensitivity of distribution coefficient,initial concentration nuclides,coefficient of permeability and porosity,by the method of factor transformation which belongs to local analysis method.