MOX fuel rod, MOX fuel assembly and method for flattening axial power

Abstract

The invention relates to an MOX fuel rod, an MOX fuel assembly and a method of flattening the axial power. The MOX fuel rod includes a doped fuel, the doped fuel is distributed in the axially middle part of the MOX fuel rod, and the doped fuel is a fuel doped with a long-lived minor actinide. The fuel in the axially middle part of the MOX fuel rod is the doped fuel, and the long-lived minor actinide in the doped fuel is transmuted in a neutron field to form a short-lived or stable nuclide, so the cost and the difficulty of final treatment of a spent fuel are reduced, and the treatment problemof the long-lived minor actinide in the spent fuel solved; and the transmutation of the long-lived minor actinide in the doped fuel, absorbing neutrons in the neutron field, is used to reduce the fission reaction rate of the doped fuel in order to reduce the original axial power and fuel consumption in the MOX fuel rod and the power and fuel consumption at a high combustion position, so the purposes of flattening the axial power of the MOX fuel rod, enhancing the reactor core safety and improving the fuel utilization rate are achieved.

Description

technical field [0001] The invention relates to the technical field of nuclear engineering, in particular to a MOX fuel rod and a MOX fuel assembly with the functions of transmuting minor actinide nuclides and flattening axial power. Background technique [0002] With the rapid growth of our country's economy, the demand for energy has greatly increased, especially after the signing of the Paris Agreement, the development of green energy has become a top priority. Nuclear energy is characterized by high efficiency, cleanliness and stability, which meets my country's energy needs. In recent years, my country's pressurized water reactor nuclear power plants have grown rapidly, but the accumulation of spent fuel has also increased rapidly. These spent fuels have a long lifespan and high radiotoxicity, threatening the human living environment for a long time. [0003] Spent fuel disposal issues, especially minor actinide nuclides with long half-lives in spent fuel 237 Np, 24...

AI Technical Summary

Problems solved by technology

However, this study only aimed at flattening the radial power of the MOX fuel assembly as a whole, and did not specifically involve how to flatten the axial power of a single fuel rod

However, due to the uneven axial power of a single fuel rod, the reactor power will be uneven, thereby reducing the fuel consumption at both ends of the fuel rod and affecting the efficiency of the reactor operation

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