The Secret City of Oak Ridge is based on the real Secret City within Oak Ridge. During WWII, the Y-12 facility made fuel for the nuclear bomb, and it is still making high quality nuclear products.

https://en.wikipedia.org/wiki/Y-12_National_Security_Complex

Interestingly enough, Oak Ridge is also one of the nicest communities in all of Tennessee, with some of the best schools, housing and highest income. It is a small paradise of engineers and high level government employees and scientists. It has only about 30,000 people there.