Main steam pipeline leakage monitoring system combining spectrum method and condensate level method

Abstract

The invention relates to the technical field of nuclear power plant monitoring, and particularly discloses a main steam pipeline leakage monitoring system combining a spectrum method and a condensate liquid level method, which comprises a main steam pipeline, a steam concentration measuring system and a condensate liquid level measuring bypass, the main steam pipeline is sleeved with a heat preservation layer, the steam concentration measuring system comprises a miniature optical fiber probe and a signal transfer device, and the miniature optical fiber probe is installed in a gap between the main steam pipeline and the heat preservation layer; the condensate liquid level measuring bypass comprises an electromagnetic valve and a condensing box, the condensing box is connected with the heat preservation layer through a measuring pipeline, and the electromagnetic valve is installed on the measuring pipeline. The monitoring system can directly monitor gaseous leaked steam in a containment environment, and is simple in principle, reliable in structure and extremely low in maintenance cost after installation. According to the monitoring system, the diversity and redundancy of a main steam pipeline leakage monitoring method are realized through the combination of a condensate liquid level method and a spectrum method, so that the detection result is more credible.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant monitoring, in particular to a main steam pipeline leakage monitoring system combining a spectral method and a condensate level method. Background technique [0002] The application of the LBB (Leak Before Break) criterion for the main steam pipeline in the design of nuclear power plants requires the nuclear power plant to have a high pipeline leakage monitoring capability. Using the leakage monitoring system, the leakage of the pipeline can be found in a timely and effective manner, and there is enough time to take corresponding treatment measures, so as to avoid the further expansion of the pipeline crack and cause a large breach. The leakage monitoring of the main steam pipeline has strong requirements for the ability of quantitative measurement . [0003] At present, the main steam pipeline leakage monitoring technology commonly used in the design of nuclear power plants, such as ...

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Problems solved by technology

[0003] At present, the main steam pipeline leakage monitoring technology commonly used in the design of nuclear power plants, such as containment pit liquid level measurement, has a long response time and poor positioning and quantitative accuracy. Therefore, it is necessary to increase leakage monitoring on the main steam pipeline using LBB technology System to meet the requirements of LBB and realize the diversity of monitoring methods

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