Nuclear power station control rod drive mechanism's detachable joint and its preparation method

Abstract

The invention discloses a preparation method of a nuclear power station control rod drive mechanism's detachable joint, comprising the following steps: 1) selecting raw materials and carrying out vacuum melting to obtain molten steel; 2) pouring an electrode by the use of the molten steel; 3) carrying out electroslag remelting of the electrode to obtain an electroslag remelting ingot, wherein the electroslag remelting ingot contains, by weight, 0.080-0.140% of C, Si being less than or equal to 0.50%, Mn being less than or equal to 0.80%, S being less than or equal to 0.020%, P being less than or equal to 0.030%, 0.50-1.00% of Ni, 11.50-13.00% of Cr, Co being less than or equal to 0.10%, Al being less than or equal to 0.050%, Mo being less than or equal to 0.60% and the balance Fe; 4) carrying out annealing treatment on the electroslag remelting ingot and then carrying out forging-cogging; and 5) carrying out annealing treatment on billets, carrying out hot rolling on round steel, carrying out quenching and tempering heat treatment on the round steel and carrying out ultrasonic flaw detection to obtain the nuclear power station control rod drive mechanism's detachable joint. By optimization of chemical composition and technology, the CRDM detachable joint obtained by the preparation method can safely operate under service conditions, a clutch part at an end portion operates within an elastic range and plastic deformation will not happen. Life meets design standards and national standard requirements of CRDM, and manufacturing nationalization of CRDM is realized.

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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