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On the host rock for the geological repositories of high level radioactive waste

WANG Ju,XU Guo-qing,JIN Yuan-xin(Beijing Research Institute of Uranium Geology,Beijing 100029,China)  
This paper introduces the host rock types for geological repositories of high level radioactive waste.The basic characteristics and engineering behaviors of granite,claystone,plastic clay,tuff and rock salt are also discussed.After presenting the advantages and the weakness of those rock types,comprehensive studies have shown that the geological repositories hosted by granite and claystone are able to meet the long-term safety requirements.According to the distribution of granite,claystone,tuff,rock salt and loess in China,it is proposed that granite is the proper host rock type for China's geological repositories and it should be considered as the main host rock.However,the possibility of clay formation with large thickness and gentle dipping angles as host rock is also discussed.
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