On Sat, Nov 16, 2013 at 4:12 PM, <spudboy...@aol.com> wrote:

> Doesn't Thorium 232 need plutonium to initiate a fertile reaction into a
> fissile one. That is converting Th232 into U233?

Yes, a LFTR needs a sort of spark plug, a strong source of neutrons to get
the cycle going. Only about 1000 pounds of Uranium enriched to 20% is
required (90% would be needed for a bomb). After that initial start Uranium
is never needed again, just more thorium.

  John K Clark

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