A swarm of the marine creatures clogged the cooling system of a nuclear site in northern France

A “massive” swarm of jellyfish prompted the Gravelines nuclear power plant to automatically switch off, the energy group EDF that operates the facility said on Monday.

The swarm of marine creatures clogged the filters of the cooling systems of the plant, the operator said. The “massive and unpredictable presence of jellyfish” prompted four power units of the facility to automatically shut off. The incident put the entire facility offline, as two other units were already inoperable due to maintenance.

The incident, which occurred late on Sunday, had…

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