Proliferation? Bogeyman! Power reactors are basically useless for bomb production even if you reprocess the fuel. While it is actually possible to make a bom

Proliferation? Bogeyman! Power reactors are basically useless for bomb production even if you reprocess the fuel. While it is actually possible to make a bomb from reactor waste it is *much* harder than making it from dedicated plutonium-production reactors. The basic problem is Plutonium isn't all the same. For a bomb you want Pu-239. The desired reaction is U-238 + n -> U-239. Decays (half life 23 minutes) to Np-239, decays (half life 2.36 days) to Pu-239. The undesired reaction is Pu-239 + n -> Pu-240. Not only does Pu-240 not go boom, but it's prone to spontaneous fission, spraying neutrons around. This is a bad thing, making your bomb very prone to being a fizzle. You defeat this by changing the fuel frequently, minimizing the Pu-240 buildup. Nobody has ever used power reactors in a bomb program. While it could be done it couldn't be done without it being apparent to observers.