Nuclear island primary coolant circuit main pipe installation method

Abstract

A nuclear island primary coolant circuit main pipe installation method uses a narrow gap automatic argon-welding method which is stable and controllable, through the measurement of a precision measuring instrument and the fitting and matching of modeling, through the adoption of the basic principle that moving track of any points on the rigid body is the same, grooves formed in the two sides of a main pipe is pro-processed. By controlling shrinkage and shrinking direction of the side welding of a main pipe reactor pressure vessel, side welding openings of vapor generators can be qualified fit up and welded with no stress. The nuclear island primary coolant circuit main pipe installation method has the advantages that through the adoption of the narrow gap automatic argon-welding method which is stable and controllable, through the measurement of the precision measuring instrument and the fitting and matching of modeling, through the adoption of the basic principle that moving track of any points on the rigid body is the same, the grooves formed in the two sides of the main pipe is pro-processed, and by controlling the shrinkage and the shrinking direction of the side welding of the main pipe reactor pressure vessel, the side welding openings of vapor generators can be qualified fit up and welded with no stress, compared with the current the third generation million level pressurized water reactor nuclear island main pipe construction scheme, 1-1.5 months of project duration can be saved.

Description

technical field [0001] The invention relates to a method for installing a main pipeline of a nuclear island primary circuit. Background technique [0002] The primary circuit system of the third-generation pressurized water reactor nuclear power technology is composed of reactor pressure vessel, steam generator (including main pump) and main pipeline (a single circuit consists of two cold sections and one hot section, a total of two circuits). When the main pipeline is installed, the reactor pressure vessel is already in place and fixed, and the steam generator is not officially in place, so there may be a small amount of displacement, but the formal in-place position has been determined, and the positions of the three nozzles on the steam generator are relatively fixed . When the side welds of the reactor pressure vessel are welded to 50% of the thickness, the mobile steam generator and the three nozzles of the main pipe can realize stress-free butt welding at the same tim...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of stress-free butt welding between the mobile steam generator and the three nozzles of the main pipeline at the same time when the side weld of the reactor pressure vessel is welded to 50% of the thickness when the main pipeline of the nuclear island is installed, the present invention proposes a The control method that can effectively control the overall deformation and movement of the pipeline solves the nuclear island where the steam generator and the three nozzles of the main pipeline are simultaneously welded without stress when the side weld of the reactor pressure vessel is welded to 50% of the thickness when the main pipeline is installed Installation method of main pipeline of primary circuit

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