Seaweed is to blame for the shutdown of a nuclear reactor in Scotland.

According to The Guardian, the 640 MW Unit 2 at the Torness plant shut down when the seaweed clogged filters in the cooling system. The reactor is expected to be down for the next seven days.

Both reactors were reportedly shut down in May due to seaweed, the article said. In 2011, a swarm of jellyfish closed the plant.

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