FYI...... have you watched any of the PBS series on Y 12? They are on channel 2, at least 4 of them. They are repeated pretty often and can be recorded for viewing later.
The first one describing the selection process and the moving from Tennessee farm land to mega secret industrial works is very good and interesting. It has commentary from folks who were kids at the time but still have fresh memories.
I just found out a couple years ago that my Mama worked between college as a secretary at Y-12. I had known of her brother who worked his whole career there.