[BlackJack]

Breeder reactors burn U235 and produce plutonium as a by-product.
Thorium burns up the plutonium. No weapons application.

[AdrianR]

Breeder reactors burn U235 and produce plutonium as a by-product. Thorium burns up the plutonium. No weapons application.

They're simply incorrect about that. Thorium-based breeders produce Uranium-233. There haven't been U233-based weapons yet but, in principle, U233 can be used for weapons just as U235 or plutonium.