System for measuring hydrogen density in nuclear power plant containment vessel

Abstract

The invention discloses a system for measuring hydrogen density in a nuclear power plant containment vessel and belongs to the technical field of density measurement of flammable and explosive gas. The system comprises a hydrogen density collection unit, a pressure collection unit and a signal processing unit. The hydrogen density collection unit and the pressure collection unit are connected with the signal processing unit respectively. The system is safe and reliable in measurement process. A hydrogen sensor in the system adopts palladium-nickel alloy and is capable of avoiding interference of CO and other gas in the containment vessel. A sampler can continuously provide media to be measured and with stable flow and ensures quick and stable measurement.

Description

technical field [0001] The invention relates to a system for measuring the concentration of hydrogen in a containment vessel of a nuclear power plant, belonging to the technical field of concentration measurement of inflammable and explosive gases. Background technique [0002] A large amount of hydrogen will be produced under accident conditions in nuclear power plants. The source of hydrogen is: 1) In the early stage of the accident, zirconium-water reaction produces hydrogen at a high rate. 2) In the middle and late stages of the accident, the radiation decomposition of water, the reaction of core melt and concrete will also produce a large amount of hydrogen. The accumulation of a large amount of hydrogen may make the hydrogen concentration in the containment vessel exceed the explosion limit of 4%, and there is a danger of explosion. In order to avoid hydrogen deflagration accidents and destroy the integrity of the containment, it is necessary to build a hydrogen measu...

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Problems solved by technology

[0007] The disadvantages of this system are: (1) The upper limit of the measured hydrogen concentration is below 4%, and it is unsafe to use it at a higher hydrogen concentration, and the ignition or explosion source of explosive gas will be formed during the power supply or heating process; (2) In the event of an accident Under working conditions, the CO gas in the containment will react with the catalytic electrode, and the measurement accuracy cannot be guaranteed; (3) The probe cover is made of porous material, the gas diffuses into the probe through permeation, and the gas flow cannot be kept stable

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