Anyone with insight on this I read years ago: http://www.popularmechanics.com/science/energy/a11907/is-the... I worry that that if Thorium reactors become very very common because they are thought to be very safe (e.g. behind your house common, as some have bragged), but they turn out to be dangerous...we will have a real problem.
I'm not sure if this is a real possibility given our current understanding of nuclear physics and reactor design. We have enough knowledge to fully understand how a reactor like this would function. Past incidents have been caused by design flaws that were known at the time. It's not a matter of lack of knowledge so much as a lack of good management and regulations.