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Cause of event: Massive Jellyfish invasion
Originally posted by Tangled2011
Masses of jellyfish entering the Torness nuclear power plant's cooling water inflow area led EDF Energy to shut both units there manually on Tuesday, the company said. "This is temporary and the reactors will be restarted once the jellyfish situation subsides," a spokeswoman for EDF Energy said. The two 640-megawatt (MW) units in Scotland went off line on Tuesday afternoon, National Grid data showed. The presence of jellyfish, seaweed and other marine life is not uncommon at nuclear power plants, EDF Energy said. Two weeks ago, an Atlantic Grey Seal was rescued from EDF Energy's Hinkley Point nuclear power station in Somerset after it got trapped in the inflow area chasing fish. The plant's operations were not affected.
...so i guess its uncommon... apparantly. Oh its from the same website by the way
a flotilla of jellyfish attacked the Turkey Point nuclear plant in Florida on September 3, 1984. They stormed the plant in such numbers and with such ferocity that they clogged the flow of cooling water to the plant’s main condensers. A metal screen designed to keep debris from being pumped into the plant was bent inward nearly two feet during the assault. Both of the nuclear reactors at Turkey Point had to be shut down. The clogged screens prevented the waste heat produced by the reactors from being dissipated to the environment. The reactors remained shut down for 11 days until Hurricane Diana swept the jellyfish back out to sea.
A Japanese nuclear reactor that slowed down when jellyfish partly blocked a seawater intake resumed normal operations on Friday, operator Chugoku Electric Power Co said. Output from the 820 megawatt reactor fell to 770 MW on Thursday after the jellyfish partly covered the entrance of a seawater supply pipe, the Hiroshima-based utility said. A fall in the number of jellyfish enabled the No.2 reactor at its sole Shimane plant return to operating at full capacity on Friday, it said.