Nuclear really isn't that dangerous.
Some radiation numbers
As far as nuclear disasters go, the fukushima death toll currently stands at 0. Predictions of future deaths range from 0-100-1000 (the 1000 being a non peer reviewed guesstimate). On the other hand, the worst hydroelectric power accident was Banquiao Damn, which caused 200,000 deaths, eclipsing even Chernobyl.
In terms of domestic terrorism, reactor grade fuel isn't enriched enough to be weaponized. Proper enriched stuff would be incredibly difficult to get a hold of. As far as the fallout from such an accident, living in a house 10 miles from Three Mile Island during the accident endows a similar radiation dosage as living in a brick house for a year. It's unlikely terrorists could turn the area surrounding a nuclear plant into a wasteland, their best bet would probably be getting hold of waste materials and pouring them into the water supply, note that the only suitable materials here would be high level waste, which accounts for less than 1% of a reactors total waste (95% of reactor waste is low level waste, which are things like cups and plates that have been used onsite). This would probably increase cancer rates over a number of years, hardly the impact terrorists go for (of course, the terrorists themselves would die awfully painful deaths due to the high doses when retrieving/opening the waste).