Best comment. The core issue in all of the major accidents that has happened with nuclear plants has been human error. TMA Unit 2 was a brand new reactor in 1979 and its failure bypassed all of the safety systems due to the operators not understanding what was happening. At Chernobyl, the night shift crew that decided to run the ill-fated experiment that destroyed the reactor ignored numerous warnings from the control system that the power level was rising rapidly until it was too late. The Davis-Besse plant in Ohio was 3/8" of stainless steel cladding from a catastrophic coolant breach that would have vented the core into the containment and probably caused a full meltdown, all because company inspectors failed to inspect the reactor head for corrosion and falsified records.
Until we have Skynet designing, building, operating. and maintaining reactors there is no way to prevent the human element from bypassing the most superb design and construction. The issues that nuclear power advocates tend to gloss over is that even if the probability of design failure is very low, some retard can decide to switch off the cooling pumps because he doesn't understand what's going on, or fail to do maintenance on the emergency backup system, etc. And when the worst case failure is contamination of hundreds of square miles of land at a likely cost of at a minimum tens of billions of dollars, this isn't acceptable.
What amazes me is that even after Chernobyl, the precise example of the worst case disaster, people continue to suggest that nuclear power is a safe form of power generation. And most of the arguments are along the lines of "well, those guys were dumb". Guess what, every reactor in operation potentially has the exact same human beings that can make the exact same kinds of mistakes.
On an engineering level, I actually like the concept of nuclear power generation. It's efficient, and non-greenhouse gas producing. Current generation designs should be very safe. But when you have for-profit companies operating them whose primary goal is monetary return, the potential for a major accident will always be present, especially in countries such as the US where corporate entities are considered sacrosanct and where the costs of a disaster will just be transferred to the taxpayer.