Interesting; that's what I figured, source data problem. I see the other nuclear security areas in WA and SC match the data to the sectional. In Oak Ridge, 3000AGL seems appropriate as the ground elevation is around 1300, making 1700 above that a little low.
Too bad the DOD DAFIF data got locked up...I can dig out my final copy from 2007 and check the restricted airspace issue there, since it must be a longstanding restriction. Just need to think of which old hard drive has it!