research reactors such as high-temperature gas-cooled reactors, fast reactors, small nuclear power reactors, molten salt reactors, and transmutation devices. Nineteen operating civil research reactors and critical assemblies maintain safe and stable operation. We have implemented the strategy of a closed nuclear fuel cycle and gradually established a complete nuclear fuel cycle system, including uranium mining and metallurgy, uranium conversion, uranium enrichment, processing of nuclear fuel elements, spent fuel reprocessing, and treatment and disposal of radioactive waste. Eighteen civil nuclear fuel cycle facilities and two low- and intermediate-level radioactive solid waste disposal sites have a good safety record.
Classification and safe disposal of radioactive waste. China implements radioactive waste classification: near-surface or medium-depth disposal of low- and intermediate-level radioactive waste in locations that meet the requirements of nuclear safety, and deep geological disposal of high-level radioactive waste in centralized locations. To ensure permanent safety, nuclear facility operating organizations and radioactive waste disposal organizations carry out minimization and decontamination of radioactive waste in accordance with the law. All provinces and equivalent administrative units have built urban radioactive waste repositories for centralized storage and proper disposal of radioactive waste produced by nuclear technology. We will continue to promote the safe storage and treatment of spent fuel, enhance our capacity in the treatment and disposal of radioactive waste, carry out the decommissioning and environmental restoration of uranium mining and metallurgical facilities, and standardize the environmental management of waste rock, waste water, tailings and slag in uranium mining and metallurgy, so as to ensure that radiation is maintained at safe levels.
Markedly improved safety in the use of nuclear technology. China implements dynamic management of radioactive sources from cradle to grave, and brings all source-related units into the scope of government regulation. We have established a national database for the management of nuclear technology utilization, taken measures to enhance the safety of radioactive sources, realized the real-time online monitoring of high-risk mobile sources, and improved the safety level of nuclear technology utilization. As of June 2019, 142,607 radioactive sources and 181,293 radiation-emitting devices were in use in China, and a total of 73,070 units were engaged in the production, sale and use of radioisotopes and radiation-emitting devices. One hundred percent of radioactive sources and radiation-emitting devices are subject to licensing management, and 100 percent of waste radioactive sources are safely stored. The annual incidence of radiation accidents from radioactive sources has continued to decline, from 6.2 per 10,000 sources in the 1990s to less than 1.0 per 10,000 sources at present, the lowest level in history.
