Because you can’t have a weapons program using Thorium. A dirty little secret about Uranium fueled reactors and their duality of purpose.
None of the uranium fueled power plant suppy the weapons program.
“Because you can’t have a weapons program using Thorium. “
A thorium cycle, it is sometimes argued can avoid this fear by avoiding any production of plutonium 239. But the thorium cycle does produce U 233, and bomb experts assure us that a bomb can easily be made from U 233, and since there are no neutrons from spontaneous fission of U 233, U 233 can also be used easily in a gun-type nuclear bomb. The advantages of a thorium cycle are not therefore as large as often claimed.
http://phys4.harvard.edu/~wilson/publications/ppaper703.html
“Because you can’t have a weapons program using Thorium.”
http://www.ieer.org/fctsheet/thorium2009factsheet.pdf