Driving rod of driving mechanism of nuclear power station control rod and preparation method thereof

Abstract

The invention discloses a driving rod of a driving mechanism of a nuclear power station control rod and a preparation method of the driving rod. The preparation method comprises the following steps: 1) selecting raw materials, smelting by using an electric furnace, refining in AOD (Argon Oxygen Decarburization) and refining by using an LF (Low Frequency) furnace so as to obtain molten iron; 2) casting the molten iron into an electrode; 3) remelting the electroslag of the electrode to obtain a steel ingot, wherein the steel ingot comprises the following components in percentage by weight: less than or equal to 0.150% of C, less than or equal to 1.00% of Mn, less than or equal to 1.00% of Si, less than or equal to 0.030% of S, less than or equal to 0.030% of P, less than or equal to 0.50% of Ni, 11.50-13.50% of Cr, less than or equal to 0.06% of Co, less than or equal to 0.001% of B and the balance of Fe; 4) fogging the steel ingot into a tube blank, hot-rolling and hot-drilling the tube blank so as to obtain a pierced billet; and 5) processing the pierced billet into the driving rod of the driving mechanism of the nuclear power station control rod. When being used in a CRDM (Control Rod Drive Mechanism), the CRDM driving rod prepared according to the method disclosed by the invention is ideal in wear-resistance and free of deflection or deformation and has certain rigidity when being meshed with a hook claw and can be safely operated under the condition of load, the service life meets the CRDM design provision and the national standard requirements, the quality also meets the advanced level of similar products in other countries, and domestication of the CRDM driving rod is achieved.

Description

technical field [0001] The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a drive rod of a control rod drive mechanism of a nuclear power plant and a preparation method thereof. Background technique [0002] Nuclear safety level equipment for nuclear power plants--control rod drive mechanism (CRDM) is an important mechanical device in the reactor system of nuclear power plants. As a part of the reactor control and protection system, CRDM is an extremely important actuator, and its main function is to drive the control rods Up and down movement in the core realizes reactor startup, power boost, power maintenance, load following, normal shutdown and accident shutdown. [0003] The CRDM of the pressurized water reactor nuclear power plant drives the control rod assembly to move up and down in the core through the movement of the drive rod part according to the signal of the reactor control and protection system. The drivi...

AI Technical Summary

Problems solved by technology

Completely relying on the supply of a small number of foreign CRDM equipment manufacturers, my country not only needs to pay more expensive procurement costs, but also has an uncertain supply cycle and high risks, which have affected the construction schedule of new nuclear power projects under construction in my country to varying degrees

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