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Hydrogen risk control system and control method for small-power nuclear reactor containment

A nuclear reactor and risk control technology, applied in the control of nuclear reactions, reactors, power plant safety devices, etc., can solve the problems of deflagration or even explosion, unsuitable for small containment, slow hydrogen elimination rate of passive hydrogen catalytic recombiners, etc. The effect of the risk of incendiary explosion

Active Publication Date: 2015-10-14
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen elimination rate of the passive hydrogen catalytic recombiner is relatively slow, which cannot guarantee that the hydrogen is not flammable
However, the igniter may fail when the water vapor concentration is high (the situation that occurs when a dehydration accident occurs). When the water vapor condenses, the igniter may become an ignition source for deflagration or even explosion when the hydrogen concentration is high, which is not suitable for small Small containment vessel for a power nuclear reactor

Method used

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  • Hydrogen risk control system and control method for small-power nuclear reactor containment

Examples

Experimental program
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Effect test

Embodiment 1

[0030] like figure 1 shown.

[0031] The low-power nuclear reactor containment hydrogen risk control system is characterized in that it includes a passive inert gas supply system and a steel containment system, and the steel containment system includes a steel pressure containment vessel 10, which is provided with The passive hydrogen removal device 11, the passive inert gas supply system includes an inert gas storage tank 1 communicating with the steel pressure containment vessel 10; the steel pressure containment vessel 10 is also connected with an exhaust system.

[0032] It can be seen from the above structure that during a serious accident of a low-power nuclear reactor, hydrogen gas will enter the steel pressure containment vessel after being generated, and accumulate in the steel pressure containment vessel. During this period, the concentration of hydrogen gas will gradually increase. It is very dangerous after reaching the explosion limit concentration, and the hydro...

Embodiment 2

[0034] On the basis of Example 1, in the specific implementation process of the present invention, the pipeline connecting the inert gas storage tank to the steel pressure containment vessel 10 is a passive gas supply pipeline, and the passive inert gas supply system also includes a manual cut-off The valve 2 and the pneumatic shut-off valve 3, and the manual shut-off valve 2 and the pneumatic shut-off valve 3 are arranged in parallel on the non-kinetic gas supply pipeline. The manual stop valve 2 and the pneumatic stop valve 3 are connected in parallel to form two types of switches. The pneumatic stop valve 3 is an automatic switch, and the manual stop valve 2 is a manual switch. After any of the manual stop valve 2 and the pneumatic stop valve 3 is opened, it can make The passive inert gas supply system injects inert gas into the steel pressure containment vessel to improve safety and prevent the system from being unable to operate after the pneumatic shut-off valve 3 fails. ...

Embodiment 3

[0036] On the basis of Example 2, preferably, the manual shut-off valve 2 and the pneumatic shut-off valve 3 and the inert gas storage tank are all set in the conventional island plant 14 . Pneumatic shut-off valve 3 is a shut-off valve powered by compressed air. When receiving a signal that needs to be opened, the pneumatic shut-off valve 3 can be opened automatically. When it cannot be opened for some reasons, the operator can open the system through the parallel manual shut-off valve.

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Abstract

The invention discloses a hydrogen risk control system and a control method thereof for a small-power nuclear reactor containment. The hydrogen risk control system comprises a passive inert gas supply system and a steel containment system, wherein the steel containment system comprises a steel pressure-bearing containment; a passive hydrogen removing device is arranged inside the steel pressure-bearing containment; the passive inert gas supply system comprises an inert gas storage tank which communicates with the interior of the steel pressure-bearing containment; the steel pressure-bearing containment also communicates with an air-discharging system; moreover, the hydrogen risk control system also comprises a monitoring system for monitoring oxyhydrogen concentration in the containment. The system and method have the following advantages: a novel hydrogen control system design method applicable to a small-power nuclear reactor is provided by the invention; through injection of inert gas into a small steell containment of the small-power nuclear reactor and combination of the passive hydrogen removing device, gas mixture in the containment is ensured to remain a non-combustible state; thus, the risk of hydrogen combustion explosion is eliminated.

Description

technical field [0001] The invention belongs to the field of mitigation of accidents (including design basis accidents, over-design basis accidents and serious accidents) in the design of nuclear reactor safety systems, and is applicable to the hydrogen risk control system in the containment of nuclear reactors, especially suitable for the control of hydrogen in the steel containment of small-power nuclear reactors. Prevention of hydrogen combustion and hydrogen explosion, specifically the hydrogen risk control system and control method for the containment of small-power nuclear reactors. Background technique [0002] In the process of serious accidents in low-power nuclear reactors, the oxidation process of reactor core metal materials such as zirconium alloys and stainless steels will produce a large amount of hydrogen. It is due to the interaction (CCI) of the core melt with the reactor building substrate concrete. The volume of the containment used in low-power nuclear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C9/02G21D3/06
CPCG21C9/02G21D3/06Y02E30/00Y02E30/30
Inventor 邹志强邓坚陈彬向清安孔翔程邓纯锐张航彭欢欢
Owner NUCLEAR POWER INSTITUTE OF CHINA
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