For a clear discussion of the dangers of nuclear power read this essay by Mitsuhei Murata, former Japanese Ambassador to Switzerland. In part he says:
Today mankind faces a crisis of civilization. The true cause is lack of ethics. Fundamental ethics would prohibit the abuse and exhaustion of natural resources leaving, permanently poisonous waste and enormous debt in its wake. Global ethics requires maternal culture, respecting the environment and interests of future generations.
There is a conflict now between the forces of destruction and the forces of life. The atom was split to create a powerful weapon of destruction. Although the promise was that nuclear reactors were to be safe, the reality of Mayak, Chernobyl, Three Mile Isalnd, and Fukushima has been that are not safe.