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I'm unsure about the viability of Thorium reactors, however, I do know that most of the folks promoting them are nutso...
The proponents of Thorium-based reactors mainly argue "well Thorium is so much more abundant than Uranium". But actually this is a non-problem and Th-based reactors don't really solve any existing problem. To create a closed nuclear fuel cycle what is really needed is breeder reactors like ASTRID.
The main argument against fission reactors is the nuclear waste which takes 200,000 years to decrease radioactivity back to the level of natural Uranium. What if we could reduce that to, say, 400 years? No one can claim to make a repository that is safe for 200,000 years. But 400 years is another story. Many buildings here are more than 400 years old (OK in the Americas not so many...) What if we could just turn all that nasty Americium and Curium into electricity? With that implemented, known Uranium deposits last for several centuries.
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I am not surprised that he espouses nuclear power. What could go wrong? Answering my own question, there was the Hanford nuclear leak, the Three Mile Island accident, the Chernobyl explosion, the Fukushima nuclear plant destroyed in a tsunami, just off the top of my head.
And after a nuclear accident, everybody dies, right? Oh, they don't? Darn...
(on 3/11/19 a German radio station reported 20,000 deaths from the Fukushima nuclear accident - seems like they have forgotten that these people died due to the deadliest tsunami in Japanese history).
So how can one evaluate how dangerous different power sources are? A good way is to say "I need a TWh of electricity how many people will die?"
Perhaps you do not know this, but the number of deaths per TWh of electricity for nuclear power is the lowest of all energy sources. Hydro is 2nd if only counting "Western" countries, otherwise Wind is 2nd.
In other news, the olympic fire relay for the Tokyo Olympics will actually pass the Fukushima Daiichi site. You can be sure that by then they will have removed any boats from temple roofs by then. If you are interested in an eye-witness report of the cleanup work, try the manga series "Ichi-F: A Worker's Graphic Memoir of the Fukushima Nuclear Power Plant"
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There's also the huge problem that nuclear plants have a finite life of maybe 30 to 40 years.
Most plants have an extended life time of 60 years, which is in fact the design lifetime of new plants. What is your point here? This is true for any power plant. In fact most don't live that long. Solar panels for example won't even last 20 years before you are left with toxic waste.
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Trying to decommission them and removing and storing the nuclear waste is incredibly difficult and expensive. I won't even touch the possibility of terrorist attacks, either to cause explosions or to steal nuclear material.
You don't seem to have thought this through...
* No one is "trying" decommisioning, this is an existing industry. And expensive is relative. Nuclear power requires a big investment but consider a reactor supplying 1600 MW of electricity for 60 years (800 billion kWh), that is a huge amount of revenue and the initial investment and the decomissioning cost seem like small change.
* Nuclear waste see above - use breeder reactors to close the nuclear fuel cycle.
* Terrorists are not stupid enough to try attacking a nuclear power plant. It would be like blowing yourself up on top of Cheops' Pyramid. No one dies, you leave some bad stains.
* Nuclear material from commercial nuclear power plants does not consist of weapons-grade material. You still need to do the enrichment and before you know it you have the IAEA on top of you. Assuming you don't die first, that is.