Detachable joint of control rod driving mechanism of nuclear power plant and preparation method thereof

Abstract

The invention discloses a method for preparing a detachable joint of a control rod driving mechanism of a nuclear power plant, which comprises the following steps: 1) selecting raw materials and vacuum smelting to obtain molten steel; 2) pouring electrodes with molten steel; 3) remelting the electrodes with electroslag to obtain Electroslag ingot, wherein, by weight percentage, electroslag ingot contains 0.080‑0.140%C, ≤0.50%Si, ≤0.80%Mn, ≤0.020%S, ≤0.030%P, 0.50‑1.00%Ni, 11.50‑13.00 %Cr, ≤0.10%Co, ≤0.050%Al, ≤0.60%Mo and the balance Fe; 4) After the electroslag ingot is annealed, it is forged and opened; 5) After the steel billet is annealed, it is hot-rolled Steel quenching and tempering heat treatment and ultrasonic flaw detection to obtain detachable joints of nuclear power plant control rod drive mechanism. The CRDM detachable joint obtained according to the preparation method of the present invention optimizes the chemical composition and process, and the CRDM detachable joint operates safely under the conditions of use. When the end clutch part works within the elastic range, no plastic deformation occurs, and the service life meets the requirements of CRDM. The design specifications and national standard requirements have realized the localization of CRDM detachable joint manufacturing.

Description

technical field [0001] The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a detachable joint 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 Up and down movement in the core realizes reactor startup, power boost, power maintenance, load following, normal shutdown and accident shutdown. [0003] Nuclear power plant CRDM detachable joints are used to connect drive rod components and control rod components. They need to have sufficient strength and impact resistance without breaking, especially the working end has the function of a c...

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 will affect the construction schedule of new nuclear power projects under construction in my country to varying degrees

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