2/3 of U.S. power plants leaking radioactive tritium
There are 65 nuclear power plants in the U.S., 44 of which are reported to be leaking radioactive tritium.
"List of Historical Leaks and Spills At U.S. Commercial Nuclear Power Plants," U.S. Nuclear Regulatory Commission, Dec. 12, 2012. http://pbadupws.nrc.gov/docs/ML1012/ML101270439.pdf [verified 4/17/14]