Jellyfish shut down one of world's largest nuclear reactors


A nuclear plant in Sweden had to be shut down due to a wave of Moon jellyfish which clogged the pipes that bring cool water to the turbines.

OKG, which operates the Oskarshamn plant at the Baltic Sea coast, had to scramble reactor number three until the pipes could be cleaned. At 1450 MW of output this is the largest boiling-water reactor in the world, according to OKG.

Nuclear power plants require a constant water flow to cool their rector and turbine systems. In 2005, another unit at the same plant had to be turned off due to a jellyfish 'invasion'  and marine biologists think this kind of occurrence could become more common.

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