Risk Assessment And Analysis During Construction Of High-level Radioactive Waste Geological Disposal Underground Laboratory

With the continuous development of world economy,the demand for energy has been unable to meet the needs of normal economic development,the traditional fossil energy combustion brings a series of environmental problems,wind power,hydro power,solar energy's utilization rate is not high,nuclear power as a new energy has clean?efficient?economic and other characteristics,is being widely used in various fields.Nuclear energy brings high quality energy,at the same time,the running of high-level radioactive waste treatment has become a difficult problem to solve.at present,the best way of dispose HLW is deep geological disposal.As a essential and indispensable key facility of high-level radioactive waste geological disposal,underground laboratory has the extremely important stat-us,It has great significance to effectively guarantee the stability of underground laboratory construction safety and long-term operation of high-level radioactive waste geological disposal project.As the research background of China's first high-level radioactive waste geological disposal of underground laboratory in Beishan Gansu province.This paper identified,evaluated and analyzed the construction risk factors of the underground laboratory during construction,then obtain the following research result:(1)Organize,statistics and Analyze the data of underground laboratory and underground engineering accident,then identified the whole life cycle risk.Got the risk factors in the underground laboratory selection stage,design stage,construction stage and operation stage,especially Evaluated the risk during the construction period.(2)According to the identified risk factors of underground laboratory during its construction period,established the fault tree analysis model of underground laboratory risk during its construction period,then got 35 risk factors by fault tree qualitative analysis and obtain underground laboratory risk factors of structure importance order from the calculation of least cut sets of the fault tree.(3)Based on the fault tree structure important degree to construct judgment matrix,set up the analytic hierarchy process analysis model of rock burst risk,water inrush risk,and the landslide risk,calculated the construction risk factor weights of underground laboratory,and draw the risk weight rose diagram.(4)Combining with the weight of ahp method,set up the system of fuzzy comprehensive evaluation of rock burst risk,water inrush risk,and landslide risk,then put forward the evaluation method of risk rating,and determined the risk level of disaster risk and main risk factors.(5)According to the above risk analysis,Put forward the main risk control methods and measures during the construction period of underground laboratory,established the risk control measures and risk contingency plans in view of the risk of rock burst,water inrush and landslides.