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Jellyfish Swarm Triggers Complete Shutdown of Gravelines Nuclear Plant

NORTHERN FRANCE, AUG 12 – Four reactors at Gravelines nuclear plant stopped due to Asian Moon jellyfish clogging cooling filters, cutting 10% of France's nuclear capacity, EDF said.

  • Four reactors at France's Gravelines nuclear power plant automatically shut down due to a massive swarm of jellyfish clogging the cooling system filters on Sunday night.
  • The shutdown followed a buildup of jellyfish linked to rising water temperatures and invasive species proliferation in the nearby North Sea.
  • The plant's six reactors each produce 900 megawatts, totaling 5.4 gigawatts, with two units offline for planned maintenance and reactor 6 shutting down several hours after the others.
  • EDF confirmed the shutdowns did not affect safety or the environment, stating the plant's teams are working to safely restart production once the filters are cleared.
  • This incident removed roughly 10% of France's nuclear capacity temporarily and highlights increasing operational challenges from jellyfish blooms linked to warming waters and heat pollution.
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Jellyfish force French nuclear plant shutdown

A nuclear plant in northern France was temporarily shut down on Monday after a swarm of jellyfish clogged pumps used to cool the reactors, energy group EDF said.

·Missoula, United States
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iHeart RADIO broke the news in United States on Monday, August 11, 2025.
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