"The Perry nuclear power plant is leaking tritium, a radioactive form of water with a half-life of more than 12 years. The radioactive water has been found in groundwater at concentrations more than twice the
federal drinking water limit outside of a building where the leak was discovered Monday. No other, more dangerous radioactive isotopes were found." John Funk reports for the Cleveland Plain Dealer January 21,
2014.
Source: Cleveland Plain Dealer, 01/22/2014