A nuclear plant in northern France shut down three reactors after a swarm of jellyfish clogged pumps used to cool the units, energy group EDF said on Tuesday. Three reactors were taken offline on Monday and output at a fourth was cut by half, EDF said in a statement, leaving just one operating at full capacity. France has seen nuclear power production disrupted by multiple heatwaves and droughts this year, with EDF shutting down several reactors in June and July because of extreme heat. The Gravelines nuclear power plant, near the northern city of Dunkirk, is the largest in Western Europe, with six 900-megawatt reactors. The nuclear power plant was temporarily taken offline a year ago after jellyfish clogged its seawater pumping stations.