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The MET test was odd, the military wanted a highly dialed in yield to test effects of nuclear weapons but somehow there was a miscommunication and they ended up using U-233 as a replacement for U-235 as an experiment. We really don't have enough information about how well U-233 might work in a nuclear weapon to make a judgment on the subject.

Anywho, in regards to the larger point, I discussed the issue in another comment, here: http://news.ycombinator.com/item?id=2723675

Basically, proliferation concerns transition entirely to the honor system once someone is operating any sort of fission based reactor, even one powered by Thorium. Since it is quite easy to breed Plutonium merely by placing natural (and readily available) U-238 in a high neutron flux environment. Simply remove your Uranium samples every 90 days or so and chemically separate out the Plutonium.

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