Arnie Gundersen, Chief Engineer at Fairewinds Energy Education, has posted a blog entitled "Downstream," about the radioactive risks to the Great Lakes from dozens of atomic reactors located on their shorelines, in both the U.S. and Canada.
Gundersen has served as expert witness for Beyond Nuclear et al. in numerous challenges to continued operations at risky reactors on the Great Lakes, including Palisades and Fermi 3 in Michigan, as well as Davis-Besse in Ohio.
(Beyond Nuclear's pamphlet, "Routine Radioactive Releases from U.S. Nuclear Power Plants," also shows it doesn't take an accident to cause contamination of surface fresh water supplies, nor coastal oceanic fisheries for that matter. A map is included, indicating which watersheds are impacted by each operating reactor in the U.S.)