Most scientists think we have a safe place to store nuclear waste deep underground in an abandon salt mine in Nevada. While there is always a small chance of an accident involving nuclear energy the fact that many hundreds of nuclear power plants are operating world wide year after year shows it is a very safe technology. And there are certainly proven health and environmental effects from the pollution given off by oil and coal fired plants.
But even more importantly- I think our continue reliance on foreign oil poses far more danger than any nuclear power plant. The middle-East is a powder keg which will bring forth the next world war and the sooner we get the hell out there the better off we will be.