My mistake, below 400'. Try 50' just for fun. Although I believe the cooling towers might reach to 200'. You facility might vary. Although if you do fly and get in trouble then be careful of posting you results on this forum for you might get chastised for not being a responsible pilot. Ultimately you are the PIC and are responsible for making sound, safe decisions.
I work at a DOE facility - one that actually is on that list in fact, and I've flown there so I'm well aware of the regulations. Where are you going with this? The discussion was about the legality of flying over a dam in Georgia that has no airspace or facility restrictions. It was derailed by completely incorrect assertions about over which DOE facilities the FAA has implemented restrictions. Having debunked those, it's now morphed into Texas State laws and whether or not it is wise to fly over random other facilities. I realize that it's now fashionable never to concede an argument no matter how demonstrably wrong it may be, but this is getting ridiculous.