Primary circuit main equipment metal reflective insulation layer structure

Abstract

The invention discloses a metal reflective insulation layer structure of primary equipment, the local thickness of the first assembly layer around the first assembly position, the local thickness of the second assembly layer around the second assembly position and the third assembly position, and the third assembly layer. The local thickness of the assembly layer around the fourth assembly position is reduced to adapt to the shape of the electric heater casing; the first assembly layer, the second assembly layer and the third assembly layer are made of metal materials. Implementing the metal reflective insulation layer structure of the primary circuit main equipment of the present invention realizes the form of zero fiber, avoids the occurrence of fuel over-temperature accidents caused by fiber blockage or increased resistance, and improves safety performance; the structure is simplified, easy to repair, maintain and Management fees.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a metal reflective heat-insulating layer structure of primary circuit main equipment. Background technique [0002] In the prior art, the main equipment of the primary circuit mainly adopts the insulation layer structure combining metal and non-metal materials, mainly because there are many electric heaters at the bottom of the voltage stabilizer, and the structural design of a single material component is difficult to implement big. [0003] In addition, there are still some insulation layers assembled with non-metallic insulation materials in the prior art. The technical problem in this structural design is: due to the use of non-metal insulation layers, it is easy to dust after a long time, and many fine fibers (fibres) are produced. ). When a breach occurs, the fibers in the insulation material will enter the pit recovery system or HR refueling pool after being washed off by wa...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the main equipment of the primary circuit mainly adopts the insulation layer structure combining metal and non-metal materials, mainly because there are many electric heaters at the bottom of the voltage stabilizer, and the structural design of a single material component is difficult to implement Big

[0003] In addition, there are still some insulation layers assembled with non-metallic insulation materials in the prior art. The technical problem in this structural design is: due to the use of non-metal insulation layers, it is easy to dust after a long time, and many fine fibers (fibres) are produced. )

Although there is a filter screen, there will still be fibers entering the primary circuit and the inside of the RPV through the low-pressure safety injection system, and the fibers accumulated around the fuel assembly will reduce the cooling effect of the assembly

The fiber is easy to block or the resistance increases, leading to RIS / EAS pump cavitation, chemical products attached to the fuel, resulting in fuel overtemperature accidents;

[0004] At the same time, the dust generated by non-metallic insulation materials will increase the diffusion of pollutants, and the radioactive substances will cause harm to the staff and increase the radioactive management costs of nuclear power plants.

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