Welding method of core shell base under metal reactor internals in high temperature gas-cooled reactor nuclear power plant

Abstract

The invention discloses a method for welding reactor core shell base under a metal reactor internal in a high temperature gas cooled reactor nuclear power plant. It can be ensured that the maximum deformation of a bottom plate is controlled to be smaller than or equal to 9.6 mm. After an inner cylinder, an outer cylinder and the bottom plate are welded and fifteen inner rib plates are evenly distributed between the inner cylinder and the outer cylinder, to-be-welded parts are preheated till the temperature is 205 DEG C or above, positioning welding is conducted between the outer cylinder and the inner rib plates and between the inner cylinder and the inner rib plates after preheating is completed, and then by means of a multi-layer multi-way welding method, the inner rib plates and the outer cylinder are welded, the inner rib plates and the bottom plate are welded and then outer rib plates are welded. The method has the advantages that it can be ensured that the maximum deformation of the bottom plate is controlled to be smaller than or equal to 9.6 mm, welding is firm, the requirement for welding quality on the aspect of nuclear power is met, and the service life of the base is prolonged.

Description

technical field [0001] The invention relates to a welding method for the base of the lower core shell of a metal reactor internal component in a high-temperature gas-cooled reactor nuclear power plant. Background technique [0002] With the introduction of the "fourth generation advanced nuclear energy system" concept, high temperature gas-cooled reactors are gradually characterized by their unique safety, wide range of uses, miniaturization, low investment, and short construction period following the introduction of the concept of modular high temperature reactors. And other characteristics have won the favor of more and more people of insight. [0003] The high-temperature gas-cooled reactor is an advanced reactor with the safety characteristics of the fourth-generation nuclear energy system. It is one of the six alternative reactor types in the fourth-generation nuclear energy system in the international nuclear energy field, and it is the only one that can achieve commer...

AI Technical Summary

Problems solved by technology

[0009] The material of the base workpiece is 12Cr2Mo1R. Due to the high content of Cr and Mo in the material, there is a greater tendency to harden during welding, and the welding is very difficult.

The maximum deformation of the bottom plate should be controlled at ≤9.6mm, that is to say, within the processing allowance. The current conventional welding method cannot guarantee that the maximum deformation of the bottom plate is controlled at ≤9.6mm

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