On-site preparation method of a neutron flux measuring tube power station

Abstract

The invention relates to the technical field of nuclear power plant maintenance, in particular to a neutron flux measuring tube power plant on-site preparation method. Use a grade 1E tape measure to measure the neutron flux tube. According to the preparation requirements, leave a margin of 2mm on the neutron flux tube before intercepting. After the assembly of the pipe beveling machine is completed, use the beveling machine to verify the beveling of the pipes of the same size, model and material. The stub end of the flux tube is beveled for welding. After the groove processing is completed, the bullet head is welded to the end of the neutron flux tube by argon arc welding. After cooling, use a reinforcement removal machine to remove the weld reinforcement. After the reinforcement is removed, ensure that the weld height is not lower than the base metal, and the surface finish is 1.6. Check with the general gauge, and store it in the preparation bracket after passing the leak test. This process can ensure that the technical conditions of the neutron flux tube to be installed meet the accuracy requirements.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant maintenance, in particular to a neutron flux measuring tube power plant on-site preparation method. Background technique [0002] Reactor neutron flux tubes in pressurized water reactor nuclear power plants, commonly known as bushings, are one of the key equipment in pressurized water reactor nuclear power plants. The number of neutron flux tubes varies with the size of the reactor. The number of sub-flux tubes is 20-50. 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 the pressure boundary of the primary circuit, because the mechanical wear caused by radiation embrittlement and flow-induced vibration will make the tube wall thinner or even damaged, which will cause leakage and ...

AI Technical Summary

Problems solved by technology

[0005] During the first installation of the neutron flux tube and during the replacement of the neutron flux tube within the lifetime of the nuclear reactor, it is necessary to cut, form and process the end of the finger sleeve. The preparation process requires high precision, otherwise it may be Resulting in reduced strength and pressure resistance at the end of the neutron flux tube

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