Nuclear power station CRDM (Control Rod Drive Mechanism) seal housing and preparation method thereof

Abstract

The invention discloses a nuclear power station CRDM (Control Rod Drive Mechanism) seal housing and a preparation method thereof. The preparation method comprises the following steps: 1) raw materials are selected, smelted in an electric furnace, subjected to AOD refining and refined in an LF furnace to obtain molten steel; 2) steel ingots are cast with the molten steel; 3) steel ingot electro slag is re-melted to obtain a billet, wherein the billet contains the following components in percentage by weight: 0-0.035 percent of C, 0-1.00 percent of Si, 0-2.00 percent of Mn, 0-0.03 percent of P, 18.50-20.00 percent of Cr, 9.00-10.00 percent of Ni, 0-0.015 percent of S, 0-0.08 percent of N, 0-1.00 percent of Cu, 0-0.10 percent of Co, 0-0.001 percent of B, 0-0.50 percent of Al and Fe in balancing amount; 4) the billet is forged, heat-treated and then processed into the nuclear power CRDM seal housing. According to the preparation method, through optimal combination and control of the chemical components, the CRDM seal housing meets the requirements on mechanical property and functionality, ensures the safety effect during operation under high-temperature, high-pressure and radioactive working conditions, meets CRDM design specifications and national standard requirements in service life and reaches the advanced level of foreign like products in quality.

Description

technical field [0001] The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a sealing shell 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 sealing shell of the pressurized water reactor nuclear power plant belongs to the first-class nuclear mechanical component. It is used for the pressure-bearing seal of the magnetic lifting control rod drive mechanism of the nucl...

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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