Thorium vehicle will run 100 years on 8 grams of fuel

[johnd83]

7. I think you misunderstand my point

In a Uranium reactor there is the risk that if the control rods are damaged or the fuel melts an uncontrolled chain reaction can occur. With Thorium this is not possible because an outside excitation is needed to create the U233. Decay heat still exists, but newer Thorium reactors either use passive cooling or are based on a liquid fluoride core that is not as susceptible to overheating. Newer reactors are actually walk-away safe, the problem with Fukishima was that it was a very old (and poorly done) design that should have been shut down decades ago.