Control rod and control rod assembly capable of flattening core axial power distribution

Abstract

The invention discloses a control rod capable of flattening the axial power distribution of a reactor core. The control rod comprises an inner layer and an outer layer, wherein the inner layer is capable of axially sliding relative to the outer layer, the outer layer comprises a plurality of neutron absorbers and non-neutron absorbers which are axially distributed at intervals, the inner layer comprises a plurality of neutron absorbers and non-neutron absorbers which are axially distributed at intervals, all the neutron absorbers and non-neutron absorbers of the outer layer and the inner layer are equal in lengths, and the number of the neutron absorbers / non-neutron absorbers in the inner layer is greater than that of the neutron absorbers / non-neutron absorbers of the outer layer by one. The invention further discloses a control rod assembly capable of flatting the axial power distribution of the reactor core. The control rod assembly comprises a plurality of control rod pairs, wherein each control rod pair comprises an A-type control rod and a B-type control rod. The control rod is applied to the power control on the reactor core of a reactor; the constitution of a control rod system and lifting and inserting procedures of the control rod are simplified; an axial power distorted peak of the reactor core can be reduced, the axial power distribution of the reactor core is improved, and further the problems of economy and safety, caused by inhomogeneous distribution of the axial power of the reactor core, are reduced.

Description

technical field [0001] The invention relates to the field of nuclear power plant safety and control machinery, in particular to a control rod and a control rod assembly capable of flattening the axial power distribution of the reactor core. Background technique [0002] The safety and control of nuclear power plants are very important. In order to control the chain reaction rate of the nuclear power plant core at a predetermined level, it is necessary to use neutron-absorbing materials to make absorbing rods, called control rods. Its main function is to compensate for fuel consumption and adjust the reaction rate and stop the chain reaction quickly. Control rods are mainly made of neutron-absorbing materials such as boron, boron carbide, hafnium, silver, indium, and cadmium. There is a set of mechanical devices outside the nuclear reaction pressure vessel to manipulate the control rods. The working principle of the control rod is: when the control rod is fully inserted int...

AI Technical Summary

Problems solved by technology

The more advanced method at present is to design special axial power distribution control rods, such as the axial power offset control rod design of AP1000 (for example: Xie Hui. Analysis and research on the operation mode of AP1000 nuclear power plant. Nuclear engineering research and design [J ], 2010, (79): 17-19.; and, Sun Jingdong. AP1000 Mechanical Compensation Control Strategy. Energy Technology [J], 2010, 31 (3): 17-19.), although this design can make the axial The power is effectively flattened, but the disadvantage is that there must be enough space in the core for the axial power to deflect the control rods, otherwise, if the number of control rods is guaranteed, the corresponding volume will increase, and then The result is that the fuel rods in the core must be reduced, so the power density of the core will be affected instead

Images