As reported by an obituary in the Washington Post.
David Zwick, and the organization he founded, Clean Water Action, have long worked in coalition with the anti-nuclear power movement.
As but one grassroots example, Don't Waste Michigan was blessed by Michigan's Clean Water Action chapter for years on end, in the form of CWA hosting monthly Don't Waste MI meetings in its Lansing offices. CWA didn't just host the meetings, they actively took part.
Such anti-nuclear collaboration also has taken place at the national level. As but one example, CWA has long resisted the nuclear power industry's coveted national dump for highly radioactive waste at Yucca Mountain, Nevada.
This makes perfect sense, given the risks to human health and the environment (and specificially, clean water!), from nuclear power and radioactive waste, during so-called "routine" operations, let alone large-scale or even catastrophic hazardous radioactivity releases, as at Three Mile Island Unit 2 in the U.S. in 1979, Chernobyl in Ukraine in 1986, and Fukushima Daiichi in Japan in 2011.