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Loss-of-coolant accidents (LOCA) in nuclear power plants (NPPs) can result in high temperature reactions of fuel cladding and coolant. During this process (radiolysis), combustible gases can be generated and accumulate within the containment. These gases, predominately hydrogen, are also produced through corrosion of zinc and aluminum and also through molten core concrete interactions. The accumulated hydrogen can quickly reach highly flammable concentration. The ignition and fast combustion of this gas mixture can cause ruptures in the containment and can also damage vital systems in the plant.


Hydrogen mixing dampers drastically reduce locally high hydrogen concentrations during accidents.
By enabling the gas to spread homogenously within the containment, dangerous gas concentrations can be avoided. This way, the hydrogen mixing system can effectively prevent fast combustion which could be critical to the integrity of the containment. Even in the event of total power failure, the hydrogen mixing dampers will stay effective. This is ensured by the fail-safe spring loaded opening mechanism, which will automatically open the damper when power fails.

 

Your Benefits

  • Greatly reduces the risk of hydrogen combustion in containment
  • Dampers are qualified for harsh environments and can be used flexibly for other ventilation applications inside or outside of containment

 

References

Hydrogen mixing dampers have been installed in NPPs in China, France and Sweden.

Interested in Hydrogen Mixing Dampers?

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