This wasn't a visitor centre tour. This was a "psst, wanna come visit where I work?" tour from one of the guys who built and ran the plant. Either pre-9/11 or

This wasn't a visitor centre tour. This was a "psst, wanna come visit where I work?" tour from one of the guys who built and ran the plant. Either pre-9/11 or very shortly post-9/11 -- with the rise of the post-9/11 security state there's no way such a tour would happen today. Indeed, the friend in question said some time later that he didn't have that kind of access-all-areas pass any more.