There are quite a few independent attempts to do that:
<a href="http://en.wikipedia.org/wiki/Molten_salt_reactor#Liquid_fluoride_thorium_reactor" rel="nofollow">http://en.wikipedia.org/wiki/Molten_salt_reactor#Liquid_fluo...</a><p>Mostly based on thorium, but they seems just use enriched uranium (U-235)... So potentially you can construct an atomic bomb fairly easily out of this fuel.