METHOD FOR MOUNTING MAIN PIPELINE OF REACTOR NUCLEAR POWER STATION COOLANT SYSTEM

摘要

Disclosed in the invention is a method for mounting a main pipeline of a pressurized water reactor nuclear power station coolant system, which is characterized in that: the main pipeline of the pressurized water reactor nuclear power station reactor coolant system is constituted of a cold segment (41) and a hot segment (42), and a steam generator is connected directly to a main pump. The invention provides a method for mounting the main pipeline without a transition segment, so that mounting and welding the main pipeline can be performed by providing only a pressure vessel or a steam generator. The invention solves the technical restriction problem in the known technique of the main pipeline mounting that the main pipeline can be in operation only when a steam generator or a main pump is provided after a pressure vessel is provided. A feasible method for shortening the construction time limit of the nuclear power station is provided in the invention, in which field numerical control technique is used in processing a main pipeline groove, laser tracking-measuring and 3D modeling technique are used in measurement, modeling and process monitoring of the main pipeline and devices connected to the main pipeline, the main pipeline is adjusted to meet the requirement of paired welding, and narrow gap TIG automatic welding technique is used to complete installation of the main pipeline.