China has made a groundbreaking achievement in the field of nuclear energy by successfully implementing the conversion of thorium-uranium nuclear fuel using a molten salt-based reactor. This breakthrough was made possible by the construction of a 2-megawatt liquid fuel thorium-based molten salt experimental reactor, led by the Shanghai Institute of Applied Physics, Chinese Academy of Sciences. The reactor has not only successfully converted thorium-uranium nuclear fuel but has also obtained experimental data after thorium was inserted into the reactor, making it the only molten salt reactor that has been successfully operated and converted thorium fuel. This achievement has preliminary proven the technical feasibility of using molten salt reactors to utilize thorium resources, further solidifying China's leading position in the international molten salt reactor research field. This milestone marks an important step in the development of thorium-based molten salt reactors and provides core technical support and feasible schemes for China's future large-scale development and utilization of thorium resources and the development of fourth-generation advanced nuclear energy systems. (Xinhua News Agency)