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Jellyfish Force Shutdown of Three Reactors at French Nuclear Plant

EDF said cleanup is finishing and the units should restart quickly after new monitoring and trawling measures were added last year.

  • On Monday, operator EDF shut down three reactors at the Gravelines nuclear power plant after a massive jellyfish swarm clogged cooling intake canals, while Reactor 1 was limited to 50% capacity.
  • Last year, the operator implemented new monitoring and trawling techniques following a complete plant shutdown to prevent or limit the impact of future jellyfish events.
  • Fishing boats deployed on Saturday to mitigate the swarm's density, while Reactor 5 remains offline for maintenance and Reactor 6 operates normally.
  • EDF stated the incident impacts neither facility safety nor the environment, though the company is grappling with heat-limited reactors nationwide as a fifth heatwave curtails output.
  • Scientists warn that jellyfish swarms could become more common due to global warming, invasive species, and over-fishing, complicating future nuclear power plant operations.
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149 Articles

Lean Right

Jellyfish have disrupted a nuclear plant in France. Three reactors had to be shut down as a large swarm arrived. Now, the question is how did such a large number of jellyfish reach the plant?

Lean Left

A swarm of jellyfish that reached the seawater pumping stations of the Gravelines power plant forced France's EDF to shut down three of its six reactors.

·Ljubljana, Slovenia
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Lean Right

The presence of jellyfish on the northern coast of France is regular and seasonal, but the report of large banks in this area is becoming more and more frequent during the summer

·Vicente López, Argentina
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nuclear-news broke the news on Monday, August 10, 2026.
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