Installation method of lower reactor internals in AP1000 nuclear power station

Abstract

The invention relates to the field of building of nuclear power stations, and provides an installation method of lower reactor internals in an AP1000 nuclear power station, which aims at decreasing difficulty, shortening time and reducing risk. The installation method comprises the following steps of arranging RV measuring control points and RV measuring points; arranging reactor internal control points and reactor internal measuring points; using a laser tracking instrument to measure the measuring points, establishing a cylinder reference simulation coordination system and a basic model of a pressure container in three-dimensional modeling software according to the measuring data, and establishing an installation model of the lower reactor internals; importing the installation model of the lower reactor internals into the basic model of the pressure container, and performing centering and pipe nozzle pairing; analyzing and calculating to obtain processing data of a positioning embedding block and an energy absorber support column, and processing the positioning embedding block and the energy absorber support column; for the lower reactor internals, lifting in for three times, and lifting out for two times, so as to complete the installation of the lower reactor internals. The installation method of the lower reactor internals in the AP1000 nuclear station has the advantages that the accuracy is high, the difficulty is low, the time is short, and the risk is low.

Description

technical field [0001] The invention relates to the field of nuclear power plant construction, in particular to a method for installing lower internal components in an AP1000 nuclear power plant. Background technique [0002] In the AP1000 nuclear power plant, the installation of the reactor internals is the most difficult and the most precise installation of the equipment in the nuclear island. It takes about 137 working days and takes the longest time. [0003] Since the reactor internals and the pressure vessel are manufactured by different manufacturers, in order to meet the assembly requirements between the reactor internals and the pressure vessel, it is necessary to process and manufacture positioning inserts installed in the radial support keyway and install Energy absorber support columns between the lower internals and the secondary support plates in the secondary core support assembly. At the same time, in order to complete the installation of reactor internals, ...

AI Technical Summary

Problems solved by technology

[0005] To sum up, it can be seen that when using the existing technology to install the lower reactor internals, it is necessary to hoist the lower reactor internals into and out of the pressure vessel many times. And each hoisting will produce a certain deviation, which will lead to great difficulty in the installation and measurement of the lower reactor internals

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