Chernobyl and Fukushima of course. You can say all day how irrelevant these are as examples for German reactors but they show what happens if anything goes wrong for whatever reason and the core melts.
And then you have the nuclear waste. Sure, the industry says it's safe and we can just dump it somewhere near or below our drinking water, forget about it and use fracking in the same region in a thousand years. Surely nothing could go wrong there. A lot of people see this differently though and think having to change containments every 100 years will also become really expensive in a thousand years. Just like destroying plants may not kill us now, but will probably reduce the oxygen supply for future generations. and then languages, signs and so on we use now are by no means guaranteed to survive the next few thousand years. So storage sites can be forgotten, signs become unreadable and future generations may make big mistakes around them, not knowing about the dangers inside.
Because if you cannot supply it with electric energy any more for whatever reason, it blows up all by itself. I know there are safety measures and they do sound good, but it's still not an inherently stable design, it's a design that you have to keep stable through constant monitoring and other efforts in order to prevent a catastrophe.
Yes, Thorium sounds great and a lot more stable and safe.
My parents live near the digging site which (at least used to have) the largest digging machine in the world. People do indeed take trips to see these incredibly large man-made colossi at work. The fascination lies more in the engineering feat than in the whole destruction of the countryside, although most people would probably rather have that than a lack of electricity. We also had school trips to the coal power plants and the diggind site.
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