WorldThree reactors at France’s Gravelines nuclear plant shut down after a massive jellyfish swarm clogged cooling intake canals, prompting rapid cleanup and preventative measures amid heatwave pressure on outputPARIS: Three reactors at France's Gravelines nuclear power plant were shut down late on Monday due to a massive swarm of jellyfish, triggering preventative measures put in place last year after the entire plant went offline, operator EDF said. The plant ⁠in northern France is one of the largest in the country and is cooled from a canal connected to the North Sea. Reactors 2, 3 and 4 ‌were taken offline due to the swarm and reactor 1 was limited to 50% of output as a preventative measure. The fishing boats were ⁠deployed on Saturday after an initial alarm was raised, limiting the impact from the swarm. EDF is also grappling with heat-limited nuclear reactors across the country, as a fifth heatwave is expected to grow throughout the week and curtail French nuclear output.