AP via Yahoo! News wrote:STOCKHOLM, Sweden - A Swedish nuclear power plant shut down one of its three reactors Monday because of an abnormal accumulation of jellyfish in the cooling system.
The Oskarshamn plant in southeastern Sweden uses water from the Baltic Sea in its cooling tanks.
The water has been unusually rich in jellyfish in recent weeks, but the problem grew worse Monday morning, forcing officials to shut down the reactor.
"When there are too many jellyfish in the cooling water, the flow is hindered and we have to clean it to keep the reactor going at full effect," plant spokesman Erik Mattsen said.
Operator OKG said there was no danger to the public. The reactor was to be restarted Tuesday.
The Oscarshamn plant supplies about 10 percent of the electricity used in Sweden. The reactor that was shut down was commissioned in 1972 and was Sweden's first commercial nuclear power unit.