Method for manufacturing positioning insert for reactor internal in AP1000 nuclear power station

Abstract

The invention relates to the field of construction of nuclear power stations. In order to reduce the workload, shorten the production time and improve the production precision, the invention provides a method for manufacturing a positioning insert for reactor internals in an AP1000 nuclear power station. The method comprises the following steps: arranging an RV control point and an RV measuring point; arranging a reactor internal control point and a reactor internal measuring point; measuring the measuring points by utilizing a laser tracker, establishing a cylinder reference simulation coordinate system and a base model of a pressure container in three-dimensional modeling software according to the measurement data, and establishing a mounting model of a lower internal; guiding the mounting model of the lower reactor internal into the base model of the pressure container, aligning, and pairing pipe nozzles; and analyzing and calculating processing data of a positioning insert, and processing the positioning insert according to the processing data. The method for manufacturing the positioning insert for the reactor internal in the AP1000 nuclear power station is high in manufacturing precision, small in workload and short in time consumption.

Description

technical field [0001] The invention relates to the field of nuclear power plant construction, in particular to a method for making a positioning insert used when installing lower internals in an AP1000 nuclear power plant. Background technique [0002] In the AP1000 nuclear power plant, 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 radial components installed on the pressure vessel at the installation site according to actual needs. Supports positioning inserts in keyways. [0003] At present, when making positioning inserts commonly used, it is necessary to hoist the lower internals into the pressure vessel and align the lower internals with the pressure vessel, and then measure the radial support key and diameter of the lower internals. The shape and size of the gap between the supp...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that when using the prior art to make positioning inserts, the hoisting and centering of the lower internal components must first be completed before the positioning inserts located between the radial support key and the radial support keyway can be aligned. To measure the shape and size of the gap, the workload is heavy, the measurement is difficult, and it takes a long time, and the hoisting will produce a certain deviation, resulting in low accuracy of the measurement data, which in turn leads to low installation accuracy of the processed positioning insert

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