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ADS Team, Institute of Modern Physics, Chinese Academy of Sciences
China Science Network June 8 news, from June 5 to June 7, 2017, the world's first 25MeV proton linac passed the test, marking a breakthrough in China's advanced nuclear fission technology. The technology "can increase the utilization rate of uranium resources from less than 1% to more than 95%, and is expected to change the nuclear fission energy from the current 100 years to a sustainable, safe and clean strategic energy source for nearly 10,000 years."
At present, the spent fuel produced by nuclear power plants contains about 95% of uranium. After using this technology, the amount of nuclear waste is less than 4% of spent fuel, and the radiation life is shortened from several hundred thousand years to about 500 years.
According to a report from the China News Service, the Chinese Academy of Sciences held a press conference in Beijing on the 8th, and the special person in charge of the "Advanced Advanced Nuclear Fission Energy-ADS Transmutation System" of the Chinese Academy of Sciences' strategic category A pilot technology introduced the progress.
According to Xu Hushan, deputy director of the Institute of Modern Physics at the Chinese Academy of Sciences, the ADS Chinese name is “accelerator driven subcritical systemâ€, which uses high-energy ions generated by an accelerator to bombard a spallation target, and then generates neutrons with high-flux and hard-energy spectra. Subcritical core operation, to achieve the purpose of spent fuel transmutation.
Xu Hushan said that in 2011 the Chinese Academy of Sciences initiated a strategic pilot project (A class) "Future Advanced Nuclear Fission Energy-ADS (Accelerator Driven Subcritical System) Transmutation System". After more than 6 years of unremitting efforts and struggling to tackle the problem, this special project will From scratch, it broke through some key core technologies and partially led international development. After recognizing that the traditional ADS scheme lacks competitiveness in terms of economy and has huge technical challenges, this special project originally put forward a new concept of “Accelerator-Driven Advanced Nuclear Energy System†and has proved its principle through large-scale parallel computing simulation research. The feasibility of completing a series of laboratory simulation experiments and achieved breakthroughs.
The concept of ADS began in the early 1990s and there are currently no built-in devices. The ADS system research and development in Europe, the United States, Japan, and other countries are moving from key technologies to systems integration. Chinese scientists have also made unique achievements in this “competitionâ€.
"The main components of the ADS system are accelerators, spallation targets and subcritical reactors." Xu said that at the beginning of this month, the research team built the first prototype of the ADS superconducting proton linac front-end in the world and passed the 25MeV (mega-electronics) organized by the Chinese Academy of Sciences. Volt) compliance test. They also originally proposed the concept of particle flow spallation target and built a prototype. In addition, the development of the world's first lead-based critical/sub-critical zero-power device for ADS research has passed the critical standards test organized by the Chinese Academy of Sciences and entered the experimental operation.
Chinese scientists are not satisfied with this. They are pioneering the new concept of the nuclear energy system ADANES (Accelerator-Driven Advanced Nuclear Energy System) while attacking ADS. In addition to the latter's more advanced combustion system than ADS, the latter also added "accelerator-driven spent fuel regeneration circulatory system."
The “intensive farming†strategy of “separation and transformation†of spent fuel was changed to “eat coarse grains and eat dry squeezing.†Xu Hushan explained that once ADANES is realized, the utilization of uranium resources will be increased from the current less than 1%. By more than 95%, the amount of nuclear waste after treatment is less than 4% of spent fuel.
Experts say that 2016 to 2023 is the ADANES principle verification, system integration and scale verification phase, and strives to build a 100 MW project demonstration project by 2030.
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