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Engineering geology of nuclear power plant and site selection of nuclear waste disposal site
As a new type of energy, the development of nuclear energy has attracted more and more attention from all countries. However, the construction of nuclear power plant has strict requirements on the hydrological, engineering geological conditions and environment of the site. If there are no active faults within 8 km around the site of nuclear power plant, it is necessary to evaluate the ground motion characteristics of the site, the relative stability of the plot and the potential geological disasters (landslide, ground collapse, etc.). Otherwise, the nuclear accident will cause huge economic losses and casualties. Therefore, all countries are very cautious in the site selection of nuclear power plants, and have done detailed hydrogeological research to ensure foolproof.

The engineering geological work of nuclear power construction at home and abroad includes: division of engineering survey and design stages of nuclear power plant, geological and seismic survey of nuclear power plant site selection, survey and evaluation of active faults, design reference ground motion and its derivation method, hydrogeology of plant site, foundation survey, test and stability evaluation, survey, test and stability evaluation of slope around reactor building, and engineering geological research of nuclear waste disposal site (Gu Xun, 1995).

Abroad, such as the United States, Russia, Germany, etc. , have experience in this field. Darlington Nuclear Power Station in Canada was built at 1978. Four generator sets (4×950MW) are installed in 1990 to 1993 respectively. Because the site area is in the plate environment, its seismic design is different from the plate edge seismic environment. At the 30th International Geological Congress, a paper specifically introduced the engineering geology and seismic structure investigation and evaluation methods of Darlington Nuclear Power Station. Japan discussed and evaluated the concepts and indicators of possible earthquakes and credible earthquakes. China has built nuclear power plants in Daya Bay, Guangdong, and Qinshan, Zhejiang, and carried out engineering geological research on the site selection of nuclear power plants in Tianjin, Liaoning and Jiangsu. In the site selection and evaluation of Tianjin nuclear heating station, the theory and method of crustal stability in "safe island" area are applied, and the new site selection is evaluated as belonging to crustal stability area by using artificial seismic profile and monitoring data of buried bedrock markers. In the site selection evaluation of nuclear power plants, it is necessary to further strengthen the comparative study of regional crustal stability and seismic fracture zoning, as well as the study of deep faults, especially the study of crustal faults and lithospheric fault activities.

The disposal of nuclear waste is mainly geological disposal, which involves engineering geological investigation of the site selection of disposal repository, selection of main rock lithology, regional stability demonstration, safety of geological barrier and stability and protection of geological environment. International organizations such as the International Atomic Energy Commission attach great importance to this. 65438-0988 began to organize and coordinate research (experiments and simulations) in developed countries such as Australia, Canada, Germany, Japan, Netherlands, Poland, Sweden, Britain and the United States. The European Union also supports and implements research and development projects related to radioactive waste management, especially geological disposal. For example, the goal of 1990 ~ 1994 is to participate in the design, operation and feasibility verification of underground buildings. According to international experience, it takes a long time and costs a lot to choose a nuclear waste storage site. China has started to build nuclear power plants, and the geological disposal of nuclear waste (low-and medium-level radioactive waste) has also begun to carry out substantive site characteristics evaluation, but only a few pre-selected areas have been identified in the study of geological disposal of high-level radioactive waste. At present, the theory, method and technology of geological disposal of nuclear waste have made new development. At the 30th International Geological Congress, the ultra-deep hole treatment technology, hydraulic gradient adjustment technology to reduce waste storage leakage, site selection standard and site investigation method were introduced.