The Strange Marine Threat Stalking Europe’s Nuclear Power Stations
France strengthened Gravelines after last year’s complete outage—but another vast swarm has still knocked out most of its available generating capacity.
A massive jellyfish swarm has forced three reactors at France’s Gravelines nuclear power plant to shut down, almost exactly one year after the same site suffered an even larger disruption.
Reactors 2, 3 and 4 were taken offline late on Monday, 10 August. Reactor 1 was reduced to 50 per cent of its output as a precaution, while reactor 5 was already unavailable for scheduled maintenance. Only reactor 6 remained fully operational, according to the latest confirmed account of the incident.
EDF said the shutdowns presented no danger to the plant, its workers or the surrounding environment. This was an operational response to disruption at the cooling-water intake, not a nuclear accident or a loss of control inside the reactors.
The scale is nevertheless significant. Gravelines has six 900-megawatt reactors and a total capacity of 5.4 gigawatts. The three shutdowns removed up to 2.7 gigawatts of nameplate capacity, while the restriction on reactor 1 reduced another 450 megawatts.
Three Reactors Were Taken Offline