Nuclear energy is not renewable energy source like some believe it is nor it is clean energy source like some suggest it is. How can nuclear energy be considered a clean energy source with such serious safety issues in form of radioactive waste and possible explosions.
You can never be 100% sure with nuclear energy in terms of safety regardless of different safety measures as the recent nuclear disaster in Japan clearly points out.
This is the main reason why our energy future shouldn't be based on nuclear power but wherever possible on renewable energy, nuclear power should be really considered as an logical energy option only in those areas where possible renewable energy solutions would be connected with huge complications or extremely high costs, though it also has to be said how the construction of nuclear power plants is anything but cheap.
Radioactive nuclear waste remains radioactive for more than 5000 years. That's a very long time to wait, especially with the current nuclear waste storage facilities, so it's no wonder that many consider this issue as a disaster waiting to happen.