The possible proliferation of nuclear weapons is not really related to the fission nuclear power plants, except as a red herring employed by the fear mongering crowd. The same is true of the potential nuclear fallout from the detonation of nuclear weapons or "accidents" at fission nuclear power plants. The lack of danger from nuclear fallout has been demonstrated by the many above ground weapons tests half a century ago and the worst case scenario at a nuclear power plant already happened at Chernobyl - lots of very nasty fallout from inside the core of a running reactor spread of Europe, yet no related increase of cancers in 3 decades. It turns out that exposure to low level ionizing radiation is not a significant cause of cancer. We have learned that almost everything can contribute to causing cancer, but it requires several events.
The prolific estimates of thousands or more of cancer deaths have been proven false.