Indeed! Those HTREs in the lot were prototypes for this particular engine. The parking lot is for the Experimental Breeder Reactor I, the first reactor in the world to make electricity. It was cooled with sodium-potassium eutectic liquid metal. Really amazing museum now.
https://www.flickr.com/photos/lhoriman/3763287997/in/album-7...
https://www.flickr.com/photos/lhoriman/3763298693/in/album-7...
The lead-lined railroad locomotive was pretty cool too:
https://www.flickr.com/photos/lhoriman/3763363831/in/album-7...
(there's a few more if you click through to the album)