Conventional island pipe wall thinning detecting device and method for nuclear power plant

Abstract

The invention provides a conventional island pipe wall thinning detecting device and method for a nuclear power plant. The device includes a temperature measuring probe which is arranged at an outer pipe wall surface of a to-be-detected pipe and is used for measuring the temperature of the outer pipe wall surface of the to-be-detected pipe, a middle storage device used for receiving and storing atemperature measuring signal transmitted by the temperature measuring probe, and a portable mobile terminal which is plugged on the middle storage device and is used for receiving the temperature of the outer pipe wall surface of the to-be-detected pipe from the middle storage device and acquiring thickness of the pipe wall of the to-be-detected pipe based on the heat conduction condition. The device is advantaged in that dismounting temperature insulation equipment and setting scaffolds can be omitted, a lot of human resources are saved, high efficiency is achieved, one-time investment is achieved, cost for calibration of the temperature measuring probe and periodic maintenance of the mobile terminal is only required, and economic property is further achieved.

Description

technical field [0001] The invention relates to the technical field of safety of nuclear power plants, in particular to a detection device and method for tube wall thinning of conventional islands of nuclear power plants. Background technique [0002] The conventional island of a nuclear power plant includes a secondary circuit water supply / steam supply system. The medium of this type of steam system is mostly high-energy steam, vapor-liquid two-phase, and condensed water. They have strong erosion / erosion capabilities for secondary circuit equipment, especially pipelines. For the sudden thinning and damage of important system pipe fittings or pipe inner walls of the secondary circuit, the nuclear power plant will periodically (usually a refueling overhaul) inspect some sensitive pipes and pipe fittings according to the in-service inspection program to evaluate the thinning situation. [0003] At present, nuclear power plants use ultrasonic flaw detection (UT) to detect sensi...

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Problems solved by technology

[0004] 1. Heavy workload: For a certain pipe fitting, the UT inspection needs to dismantle the on-site insulation and build scaffolding. After the inspection is completed, the original insulation will be reinstalled; every overhaul, the nuclear power plant inspects hundreds of pipe fittings , the workload is considerable, and potential industrial risks also coexist;

[0005] 2. High cost: This method of regular inspection is a fixed cost for each overhaul, and the manpower and material resources consumed are periodic

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