Control rod assembly comprising axial partition control rod and heavy metal absorber rod

Abstract

The invention discloses a control rod assembly comprising an axial partition control rod and a heavy metal absorber rod, belonging to the field of nuclear reactors. The control rod assembly is used for controlling the reactivity of a heavy metal cooling reactor; as a part of the control rod assembly, the control rod is inserted into a core part of the reactor together with a fuel assembly so as to control the reactivity. The control rod comprises a control rod assembly guide pipe (1), a coolant passage (2), a control rod housing (3), clearances (4), a moderator rod (5) and a heavy metal absorber rod (6). The control rod disclosed by the invention satisfies the reactivity control capability of the heavy metal cooling reactor and also overcomes the defects that a conventional control rod material has lower density than that of a coolant and has a weak neutron absorption capability under a fast neutron energy spectrum. The control rod assembly disclosed by the invention is simple in structure, reliable, and convenient to maintain.

Description

technical field [0001] The invention relates to the field of reactor equipment and belongs to the technical field of reactor engineering, in particular to a control rod assembly with axial partition control rods and heavy metal absorber rods. Background technique [0002] Controlling the reactivity by moving the absorber of the control rod is a way to control the reactivity of the existing reactor. When the volume of the absorber of the control rod entering the reactor core area is large, the number of neutrons absorbed by the control rod in the core When the control rod absorber enters the reactor core area, the volume of the control rod absorber is less, the number of neutrons absorbed by the control rods in the core decreases, and the reactivity increases. In a heavy metal cooled reactor, the neutron energy spectrum is high and the coolant density is high (for example, the coolant lead-bismuth density in a lead-bismuth reactor is greater than 10g / cm 3 ), the existing rea...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a control rod assembly with axially partitioned control rods and heavy metal absorber rods, to solve the problem that the absorption cross section of the absorber material in the fast neutron region is low, and the density of the heavy metal cooling reactor is lower than that of the control rods. The problem with large components

Images