There are, anything that isn’t a breeder won’t build up enough plutonium or it will burn that too but it doesn’t mean you can’t convert them to breeders by chan

There are, anything that isn’t a breeder won’t build up enough plutonium or it will burn that too but it doesn’t mean you can’t convert them to breeders by changing the fuel cycle. To combat proliferation reactor designs aren’t the issue, you need to control the source of the fuel and it’s entire lifecycle. Building nuclear weapons isn’t hard, but it’s a project that requires a huge investment in infrastructure so proliferation has always been a question of will and consequences not capability.