Sleeve shaft of control rod driving mechanism of nuclear power plant and preparation method thereof

Abstract

The invention discloses a preparation method of a sleeve shaft of a control rod drive mechanism (CRDM) in a nuclear power plant. The method comprises the following steps: 1) selecting raw materials and obtaining molten steel by techniques of electric furnace smelting, AOD (Argon Oxygen Decarburization) refining and LF (Ladle Furnace) refining; 2) pouring the molten steel to form a steel ingot, wherein the steel ingot contains the following components by weight percent: less than or equal to 0.05% to 0.06% of C, less than or equal to 0.75% of Si, less than or equal to 2.00% of Mn, less than or equal to 0.030% of P, less than or equal to 0.50% of Cu, 18.00% to 18.50% of Cr, 10.50% to 11.00% of Ni, less than or equal to 0.015% of S, less than or equal to 0.10% of Co, less than or equal to 0.001% of B, less than or equal to 0.15% of Nb+Ta, 0.06% to 0.07% of N and the balance of Fe; 3) forging the steel ingot to form a pipe billet and performing hot piercing on the pipe billet so as to obtain a pierced billet; and 4) processing the pierced billet to form the sleeve shaft of the CRDM. According to the method, the sleeve shaft of the CRDM can reach the requirement on mechanical properties and functions specified by RCCM through the optimized combination of the chemical components and the component control in the preparation process; the intercrystalline corrosion of the sleeve shaft is avoided during a sleeve shaft running process; and the service life of the sleeve shaft meets the requirements of the CRDM design specification and the national standard.

Description

technical field [0001] The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a sleeve shaft of a control rod driving 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 It moves up and down in the core to realize reactor start-up, power increase, power maintenance, load tracking, normal shutdown and emergency shutdown. [0003] The CRDM quill of a pressurized water reactor nuclear power plant is a long and thin hollow tube with a blank size of 80x47.2x1100mm. The CRDM sleeve shaft has a guiding effect, and the drive rod passes through the center of the tube. T...

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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