Foreign matter monitoring system and method for secondary circuit of pressurized water reactor nuclear power plant

Abstract

The invention discloses a foreign matter monitoring method for a secondary circuit of a pressurized water reactor nuclear power plant. The method comprises the steps: S1, monitoring a vibration signalon a water supply pipeline by a vibration monitoring device mounted on the water supply pipeline on the secondary side of a steam generator; S2, acquiring a vibration signal by a portable data acquisition instrument, and sending the vibration signal to a signal analysis system; and S3, comparing the vibration signals by the signal analysis system, and judging whether the vibration signals are caused by foreign matter impact or not in combination with the working condition of the secondary circuit and on-site video monitoring information. When a nuclear power plant debugging unit or overhaul unit secondary circuit has water transferred to a unit commercial operation period, the foreign matter monitoring method provided by the invention can monitor whether hard foreign matters pass throughthe interior of the main water supply pipeline or not, so that wear damage to internal parts of a tube plate and a sleeve due to the fact that foreign matters are left on the upstream of the pipelineor loose parts enter the SG is avoided.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a foreign matter monitoring system and method for the main water supply pipeline of the secondary circuit of the pressurized water reactor nuclear power plant. Background technique [0002] There is a mature system for foreign body monitoring in the primary circuit of pressurized water reactor nuclear power plants. The Loose Parts Monitoring System (LPMS) can effectively identify the movement or retention of foreign bodies in the primary circuit pressure vessel or steam generator. [0003] Foreign matter on the water side of the secondary circuit of a pressurized water reactor nuclear power plant is likely to stay on the secondary side of the steam generator (SG) tube sheet under the impact of water flow. risks of. However, on the secondary circuit, due to the difficulties involved in various operating systems, complex switching of working conditions, high environme...

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Problems solved by technology

[0003] Foreign matter on the water side of the secondary circuit of a pressurized water reactor nuclear power plant is likely to stay on the secondary side of the steam generator (SG) tube sheet under the impact of water flow. risks of

However, on the secondary circuit, due to the difficulties involved in various operating systems, complex switching of working conditions, high environmental noise, long signal distance, and high propagation attenuation rate, there has been no substantial progress in the research and commercial application of foreign matter monitoring in the secondary circuit of nuclear power plants.

The existing foreign matter monitoring system usually uses monitoring sensors installed on the SG body, which reduces the reliability and accuracy of monitoring

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