Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel

Abstract

The invention discloses a method for manufacturing a low-voltage power cable used in a third-generation nuclear power station containment vessel, and relates to the field of cable manufacturing. The manufacturing method comprises the steps of material selecting, wire drawing, annealing tinning, conductor stranding, inner insulating layer and outer insulating layer co-extrusion wrapping, irradiation crosslinking, cable forming, packing layer extrusion wrapping, outer sheath layer extrusion wrapping, irradiation crosslinking, performance check testing and finished product packaging and warehousing. Material selecting comprises the steps that copper wire blank for electrical purposes is selected to be used as conductors, and high polymer materials are selected to be used as insulating materials and sheath materials, wherein according to long-time heat resistance evaluation, the service life of the high polymer materials is longer than 60 years. The low-voltage power cable manufactured through the method is greatly improved in service life, irradiation resistance and fire resistance and can operate by more than 60 years under the normal working conditions of a third-generation nuclear power station, and the fact that the functions of the low-voltage power cable can still be executed under DBAs and Post-DBAs.

Description

technical field [0001] The invention relates to the field of cable manufacturing, in particular to a manufacturing method of a low-voltage power cable used in a containment shell of a third-generation nuclear power plant. Background technique [0002] In October 2012, the Nuclear Power Plant Safety Plan (2011-2020) and the Medium- and Long-Term Development Plan for Nuclear Power (2011-2020) were discussed and approved. In terms of the construction pace of nuclear power plants, it is necessary to "reasonably grasp", "progress steadily", and "return to normal construction steadily"; in terms of access threshold, "newly built nuclear power units must meet the third-generation safety standards," and build nuclear power projects in accordance with the world's highest safety requirements. This marks the restart of nuclear power projects, and the construction of third-generation nuclear power plants is imperative. [0003] The safety and economy of the third-generation nuclear pow...

AI Technical Summary

Problems solved by technology

The third-generation nuclear power plants put forward new requirements for the cables used. The nuclear-grade cables used in the existing second-generation or second-generation semi-nuclear power plants have a design service life, radiation resistance, flame retardancy, and design basis accident DBA and Post-DBA. Post-safety function requirements cannot meet the requirements of third-generation nuclear power

The invention patent does not have a big breakthrough in service life, radiation resistance and flame retardancy, and cannot operate for more than 60 years under normal working conditions in the third-generation nuclear power plant containment

[0005] The above-mentioned existing technologies cannot operate for more than 60 years under normal working conditions in the containment of third-generation nuclear power plants, and ensure that they can still perform their functions in design basis accidents DBA and Post-DBA

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