Jellyfish Swarm Forces French Nuclear Plant To Shut

A French nuclear plant temporarily shut down on Monday due to a “massive and unpredictable presence of jellyfish” in its filters, its operator said. The swarm clogged up the cooling system and caused four units at the Gravelines nuclear power plant to automatically switch off, energy group EDF said. The plant is cooled from a canal connected to the North Sea — where several species of jellyfish are native and can be seen around the coast when the waters are warm. According to nuclear engineer Ronan Tanguy, the marine animals managed to slip through systems designed to keep them out because of their “gelatinous” bodies.

“They were able to evade the first set of filters then get caught in the secondary drum system,” he told the BBC. Mr Tanguy, who works at the WNA, said this will have created a blockage which reduced the amount of water being drawn in, prompting the units to shut down automatically as a precaution. He stressed that the incident was a “non-nuclear event” and more a “nuisance” for the on-site team to clean up. For local people, there would be no impact on their safety or how much energy they could access: “They wouldn’t perceive it as any different to any other shut-down of the system for maintenance.”