Rapid analysis device and method for hydrogen concentration in nuclear power plant containment

Abstract

The invention discloses a rapid analysis device and method for hydrogen concentration in a nuclear power plant containment. The rapid analysis device comprises a gas sampling and introducing device, ahydrogen concentration measuring device and a gas exhaust and recovery device, wherein gas sampling and introducing device comprises a first gas inlet branch and a second gas inlet branch which are arranged in parallel, the first gas inlet branch is connected with the nuclear power plant containment and extends into the containment, the second gas inlet branch is connected with a standard gas tank, and the other ends of the first gas inlet branch and the second gas inlet branch are communicated with the hydrogen concentration measuring device; the hydrogen concentration measuring device comprises a first container and a second container, and the output end of the first container and the input end of the second container are connected through a first output branch or a second output branch; the gas exhaust and recovery device comprises a vacuum pump and a shifting pump. Rapid online or offline sampling detection of hydrogen concentration in the nuclear power plant containment can be realized, detection range is wide, and an analysis result is accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of safety detection of nuclear power plants, in particular to a rapid analysis device and method for hydrogen concentration in the containment of nuclear power plants. Background technique [0002] When a serious accident occurs in a nuclear power plant, a large amount of hydrogen gas can be produced due to the comprehensive reactions such as the zirconium-water reaction in the early stage of the accident and the radiation decomposition of water in the later stage. The rapid accumulation of hydrogen gas presents the danger of combustion / explosion. After the Fukushima nuclear accident in Japan, the hydrogen risk control under severe accident conditions in the containment of nuclear power plants has attracted great attention at home and abroad, and the rapid analysis of the hydrogen concentration in the containment is a prerequisite for hydrogen risk control. [0003] Since the generation of hydrogen is in an ...

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Problems solved by technology

[0004] Traditional gas measuring instruments, such as chromatography, infrared, Raman, etc., have a long test cycle and complicated methods. Before each measurement, professionals need to perform a series of tedious and complicated calibration work, which makes it difficult to quickly analyze and maintain, and cannot stand by around the clock Use; again, the gas in the shell is radioactive, and it needs to return to the containment after analysis and detection, which puts forward high requirements on the sealing, radiation resistance and gas circulation system of the device

However, the existing hydrogen concentration monitoring schemes for serious accidents in nuclear power plants, whether it is in-shell measurement methods, in-shell sampling, or out-shell measurement methods, currently focus on system design, and the main components of hydrogen analysis are hydrogen sensors, hydrogen analyzers, etc. The main components that its analysis and detection rely on have problems such as failure under the conditions of high temperature, high pressure, high humidity, and high radiation after the containment accident, and there are risks such as inaccurate analysis and inability to stand by around the clock

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