system
Given the following post, respond as if you're commenting on Reddit:
human
Can you build Nuclear Weapons from a light-water reactor?

I was reading a wiki the other day where the United States came to a compromise with North Korea (over a decade ago) regarding nuclear energy. North Korea wanted to pursue it for "energy" purposes, so instead, the United States offered to build a light-water reactor there instead.

I would assume there would be little to no supervision outside of the occasional UN visit. 

Could you build nuclear weapons from LWR?

Is there a viable reactor we could build in countries that is a good source of energy, you can't build powerful weapons from, and don't need supervision?

I am creating a (fictional) policy on how to attack climate change from the perspective of the U.S.
gpt
Anytime you have a process that involves neutrons, you have the capability to create plutonium. This includes light water reactors. 

That said, you need to be constantly removing fuel and separating the Plutonium, which requires complex reprocessing centers. You also need enrichment centers to bring the enrichment rate up from <1% to >95% that weapons typically use. 

The best way to prevent a nation from making weapons, is to prevent them from having reprocessing and/or enrichment technology.