Device for detecting clearance flow instability phenomenon in nuclear reactor

Abstract

The invention provides a device for detecting a clearance flow instability phenomenon in a nuclear reactor. The device comprises a heat source, a cooling source, an ascending section, a flow source and a data collection device, wherein the heat source is providing energy input and located at the lower part, the cooling source is located at the upper part, the ascending section is connected between the cooling source and the heat source and is used for simulating the clearance flow instability phenomenon, the flow source connected with the other end of the heat source, a first switching valve is arranged between the heat source and the flow source and is used for cutting off an enforced circulated flow. The device disclosed by the invention is used for elaborating the clearance flow instability phenomenon initiated under a low-pressure condition, explaining the characteristics of clearance flow instability, and qualitatively and quantitatively establishing a mutual relation of characteristic parameters and clearance flow instability characteristics of the system, and finding out key parameters and influence factors.

Description

technical field [0001] The invention relates to a detection device in the field of nuclear industry, in particular to a device for detecting the unstable phenomenon of interstitial flow in a nuclear reactor. Background technique [0002] With the continuous development of human society, the demand for energy is increasing. Due to the huge environmental pollution caused by traditional fossil fuels, the requirements for energy cleanliness have become higher and higher in recent years. As the greenhouse gas emission of nuclear energy is almost zero, it has the advantages of high energy density, stable energy output, increasingly mature technology and large-scale application. Therefore, nuclear energy has become one of the important energy source options besides traditional fossil energy. In the utilization of nuclear energy, due to its particularity, safety issues are considered first. The heat transfer of the core has a great impact on the safety of the reactor. In order to...

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Problems solved by technology

[0005] At present, although many researchers have carried out a large number of tests and theoretical studies on interstitial flow instability and similar flow phenomena, and carried out preliminary analysis and exploration of their generation mechanism, the gap in the flow system that cannot establish natural circulation There are still deficiencies in the study of flow instability: the research on the influencing factors and flow characteristics of interstitial flow instability in this case needs to be further improved, and the research on the mechanism of interstitial flow instability needs to be further strengthened

However, the detection methods involved in this technology cannot be applied to the existing third-generation passive safety pressurized water reactor nuclear power plants

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