Filtered Containment Venting System

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Filtered Containment Venting System (FCVS) is a system to retain fission products in case of a nuclear accident.


In the event of a nuclear power plant accident the pressure within the nuclear reactors containment building can increase. A FCVS allows for the release of the over-pressure through a scrubber normally containing water, stones and chemicals, where most of the fission products are contained. This reduces the radioactive release to the environment with up to 99%.

Fukushima nuclear disaster[edit]

The plant involved in the Fukushima Daiichi nuclear disaster did not contain FCVS.


Many countries require FCVS: for example, Sweden, Germany and France.


AREVA[1] and Westinghouse Electric Company[2] deliver FCVS.