Method for measuring concentricity of internal structure in pressurized water reactor in nuclear power plant after alignment

Abstract

The invention relates to the field of installation of the internal structure in a pressurized water reactor in a nuclear power plant. In order to solve the problems that the operation is complicated, the personnel requirements are high, the method is greatly affected by the environment, the environment is polluted, and the human health is damaged in the prior art, the invention provides a method for measuring the concentricity of an internal structure in a pressurized water reactor in a nuclear power plant after alignment. The method comprises the following steps that a nadir instrument and a micrometer translational coordinate table are arranged on a tripod positioned at a 3G hole of an upper supporting plate through a connecting base, and the micrometer translational coordinate table is positioned between the connecting base and the nadir instrument; a vertical reference line is established by taking a 3G hole in a lower reactor core plate as a reference point, and a positioning tooling is arranged at 3G holes in the upper reactor core plate and the upper supporting plate; the 3G holes are measured and recorded as X<3G base> and Y<3G base>, X<3G upper reactor core> and Y<3G upper reactor core>, X<3G upper support> and Y<3G upper support>; the concentricity of a 3G hole group is calculated; and similarly, the concentricity of 7C, 7L and 11G hole groups is measured and calculated. The measurement method is simple in operation, the measurement results are slightly affected by the environment, and the method is pollution-free and safe.

Description

technical field [0001] The invention relates to the installation of pressurized water reactor internal components in nuclear power plants, in particular to a method for measuring the concentricity of the centered pressurized water reactor internal components. Background technique [0002] The pressurized water reactor core in a nuclear power plant is the heart of the nuclear power plant, and its installation quality represents the life of the nuclear power plant. When building a nuclear power plant, after the installation of the internal components of the PWR is completed, the installation accuracy must be measured to ensure that the internal components of the PWR are installed qualified, thereby avoiding damage to the nuclear power plant due to unqualified installation of the internal components of the PWR. The operation has buried great safety hazards, and even caused immeasurable catastrophic consequences. [0003] Currently, the commonly used figure 1 The distribution ...

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Problems solved by technology

[0030] In order to solve the problem of using the existing technology to measure the concentricity of the internal components of the centered nuclear power plant, the operation of the concentricity is complicated, time-consuming, demanding on the measurement personnel, and the measurement results are greatly affected by the environment. A mercury surface is used to establish a plumb baseline. To pollute the environment and damage the personal health of construction workers, the present invention proposes a method for measuring the concentricity of the internal components of the pressurized water reactor in the nuclear power plant after centering. The measuring method includes the following steps:

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