An interesting point to consider: If we generated all of our electricity using the worst reactor design known, the Chernobyl design, and handled all of them just as badly, we would have a system with 1/3rd the deaths that our current fossil fuel system has today!
Here's the math. Assume that the globe has 18 trillion watt-years of electricity capacity per year. We can round that up to 20 terawatt-years. The Chernobyl reactors had 4 gigawatt-years capacity. So global production capacity is equal to 5000 Chernobyl plants. We will assume that each Chernobyl clone (4 reactors per plant) runs 20 years, with one reactor blowing up randomly during that time. (In reality, the Chernobyl event was caused by an astonishingly stupid boss, and was not random at all. There is no real reason to think it should ever happen again, certainly not anywhere near this assumed frequency.)
So, in 20 years, we would see 5000 Chernobyl equivalent events in 20 years. The deaths from those events, over 45 total years elapsed (assuming that every reactor explosion was handled just as badly - no learning occurs) would be 250,000.
That seems like a lot. But that is equal to the deaths from 250 coal fired power plants in just a 30 year period. (Ignoring any future deaths that would result from human-derived climate change.) There are over 1600 coal plants in the world today.
Let's presume that half of those coal plants have near perfect emissions controls, so they act like 800 plants. Those 800 plants are giving us the deaths equivalent to what 16,000 Chernobyl plants would give.