On-line displacement process for nuclear reactor neutron flux pipe

Abstract

The invention relates to an on-line displacement process for a nuclear reactor neutron flux pipe. The on-line displacement process for the nuclear reactor neutron flux pipe is characterized by using an on-line machining device for the neutron flux pipe and comprising the following steps that S1, preparation before displacement of the neutron flux pipe is performed; S2, aligning and cutting of a neutron flux pipe handle are performed; S3, cutting and separating of a handle check block and the neutron flux pipe are performed; and S4, welding of the neutron flux pipe is performed. The on-line displacement process has the following advantages that (1) through the on-line displacement process, cutting operation of the neutron flux pipe handle check block and a neutron flux pipe handle extensionsection and groove machining operation can be completed, and the size precision and the position precision of a groove are ensured; (2) through the on-line displacement process, it can be ensured that the displacement size of the neutron flux pipe needing to undergo displacement operation can meet the requirement; (3) through the on-line displacement process, it can be ensured that the size and the surface smoothness of a welding seam obtained after welding of the neutron flux pipe can meet requirements; (4) through the on-line displacement process, it can be ensured that the sealing performance of the neutron flux pipe can meet the requirement; and (5) through the on-line displacement process, it can be ensured that the welded neutron flux pipe can meet the use requirements in a reactor.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant maintenance, and in particular relates to an online displacement process of a neutron flux tube of a nuclear reactor. Background technique [0002] The reactor neutron flux tube of the pressurized water reactor nuclear power plant is one of the key equipments of the pressurized water reactor nuclear power plant. The number of measuring tubes varies according to the stack type, generally between 20 and 50. As a measurement channel for the neutron flux of the core nuclear measurement system, the neutron flux tubes are evenly distributed in the channel of the core fuel assembly, run through the fuel assembly, and are exposed in the core. The neutron flux tube is one of the pressure boundaries of the primary circuit of the reactor system. Because of the mechanical wear caused by radiation embrittlement and flow-induced vibration, the tube wall will be thinned or even damaged, which will c...

AI Technical Summary

Problems solved by technology

The neutron flux tube is one of the pressure boundaries of the primary circuit of the reactor system. Because of the mechanical wear caused by radiation embrittlement and flow-induced vibration, the tube wall will be thinned or even damaged, which will cause the primary circuit coolant to leak and pollute the local area.

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