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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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131 Articles

Center

Millions of jellyfish blocked the cooling systems of the Graveline nuclear power plant – three reactors had to be shut down. Climate change is making the plague worse and worse.

·Syke, Germany
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Lean Left

The appearance of jellyfish has become more frequent in France due to climate change - Nuclear plants near the coast are having difficulty pumping water for the necessary cooling. The post France: Shoals of jellyfish block nuclear plants - "Immune to climate change" appeared first on in.gr.

·Greece
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Center

A swarm of jellyfish blocked the pumps used to cool the reactors.

·Helsinki, Finland
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nuclear-news broke the news on Monday, August 10, 2026.
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