The PDF posted is left wing, anti-military screed.
To be fair, the Army just started removal of the reactor carcass two years ago. I visited the site a few time while Active Duty USAF - just another building with a fence - and a lot of warning signs.
It was a prototype, another was on the Greenland ice cap secret ‘missile base’. Read mo9re here -
https://www.usace.army.mil/About/History/Exhibits/Nuclear-Power-Program/Experimental/