Arrangement structure of neutron poisons in solution storage tank

Abstract

The invention relates to a control technology of criticality safety in fissile substance solution storage tanks in a reprocessing plant and in particular relates to an arrangement structure of neutron poisons in a solution storage tank. The arrangement structure comprises the multiple neutron poisons which are arranged in the solution storage tank, wherein the cross sections of the multiple neutron poisons are cruciform, and each neutron poison extends along the height direction of the solution storage tank; a gap is reserved between each two adjacent neutron poisons; a piece of stainless steel cladding is arranged outside each neutron poison; the stainless steel cladding is filled with the neutron poisons. The two wings of each cruciform neutron poison are of a flat structure and can be adjusted to obtain the optimal thickness. Meanwhile, the reaction area between each neutron poison and a solution is enlarged, and a neutron absorption effect is obvious. The neutron poisons and the solution are isolated to be sealed, and thus possible loss of the neutron poisons is avoided.

Description

technical field [0001] The invention relates to a critical safety control technology in a fissile substance solution storage tank of a post-processing plant, in particular to an arrangement structure of neutron poisons in a solution storage tank. Background technique [0002] my country's nuclear fuel cycle policy adopts a closed nuclear fuel cycle method. The spent fuel discharged from the reactor is sent to a reprocessing plant to separate uranium and plutonium from the spent fuel for reuse. The main reprocessing process in the world uses wet process to reprocess spent fuel, such as the Prex method, which uses nitric acid or organic solvents as chemical reagents to change the physical and chemical form of nuclear fuel, and uranium plutonium and fission products, etc. The separation and reuse of the element is called the chemical treatment process. [0003] In the above-mentioned chemical treatment process, there will be many cases where the solution is stored in storage t...

AI Technical Summary

Problems solved by technology

[0003] In the above-mentioned chemical treatment process, there will be many cases where the solution is stored in storage tanks, and in order to meet the requirements of higher processing capacity and processing capacity in large-scale spent fuel reprocessing plants, the volume of storage tanks may become very large. Large, the previous geometric control applicable to the entire concentration range, that is, the method of only using geometric shape design to ensure critical safety cannot meet the requirements, so other critical safety control methods are usually adopted to ensure the subcritical safety of equipment, adding neutrons Poison is one of the more commonly used methods

Images