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If something is Nuclear enough it can generate heat, its just the reactors make use of an actual reaction that nuclear waste can’t do anymore. Yever watch the Martian, he has a generator that’s fuel is lead covered beads of radioactive material, it doesn’t generate as much as reactors but it’s still a usable amount.
But what if something pulls a Netflix and blacks out the window when you try to screenshot. The sanctity of the screenshot is ruined, take more pictures.