The vallecitos reactor site is still there to look for anyone in the bay area, at least for the next few years. It's along the 680 corridor just south of Pleasanton and it's been quietly producing medical isotopes since the 70s. They shut down the power factors after they discovered that the entire Pleasanton valley is a gigantic active fault zone called the calaveras fault, and the site itself is in a rift from from another, smaller fault called the positas fault.
The long de-fueled reactor vessel was removed just last year.[1] Sent to Texas as a final resting place. The containment dome was still in place then. The next step is to restore the Vallecitos complex to "conditions suitable for productive reuse for other commercial or industrial purposes."[2]
So that's the aftermath of the first commercial small nuclear power reactor.
Probably not the greatest placement in hindsight.