Molten salt reactor thorium fuel cyclic utilization method

Abstract

The invention discloses a molten salt reactor thorium fuel cyclic utilization method. A reactor core comprises a graphite assembly and fuel molten salt, wherein the fuel molten salt is filled in a passage formed by the graphite assembly; the fuel molten salt comprises fuel salt and base salt; during operation, the on-line feeding is used; fission gas is cleared in a on-line way; reactor stopping off-line operation is performed, spent fuel is treated; recovered uranium, base salt and thorium are proportioned again and are then loaded into the reactor core for cyclic utilization, wherein the volume ratio of the fuel molten salt to the reactor core is 5 percent to 15 percent; the fuel salt is a mixture of ThF4 and UF4, wherein the U enrichment degree is 15 to 20 percent; the initial mole percentage of the fuel salt in the fuel molten salt is 6 percent to 8 percent; the initial mole percentage of ThF4 in the fuel salt is greater than 80 percent. The method has the advantages that under thecondition without depending an on-line treatment technology, the fission contribution of thorium fuel in the molten salt reactor is improved, so that the utilization rate of U-235 is improved; the radioactivity and the disposal quantity of the spent fuel are reduced.

Description

technical field [0001] The invention belongs to the field of nuclear reactor engineering design, in particular to a molten salt reactor thorium fuel recycling method. Background technique [0002] The geological storage of thorium is 3-4 times that of uranium. Thorium can be converted into fissile U-233 by absorbing a neutron. It is a potential nuclear fuel. The large-scale utilization of thorium will greatly expand nuclear fuel resources. reserves. At the same time, thorium fuel produces less highly radioactive transuranic elements and is a cleaner nuclear fuel. For this reason, there have been a large number of studies on the utilization of thorium in various nuclear reactors at home and abroad. [0003] Studies have shown that due to the limitation of the burnup depth of components in solid fuel reactors, the fuel conversion of thorium is not sufficient, and the improvement of fuel utilization is generally less than 20%. At the same time, it has a relatively large nega...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem that the existing liquid fuel molten salt reactor thorium fuel utilization scheme relies on online processing technology, thereby providing a molten salt reactor thorium fuel recycling method that does not rely on online processing technology In this case, the fission contribution of thorium fuel in the molten salt reactor is increased, thereby increasing the utilization rate of U-235 and reducing the radioactivity and disposal amount of spent fuel

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