They may have some left over.
When Germany surrendered in WWII, nuclear material from a U-Boat that was originally headed for Japan was unloaded at Portsmouth.
And, of course, Portsmouth Naval Shipyard did build nuclear powered subs at one time, the USS Thresher being the most unfortunate.
And, Seabrook Station, the last nuclear power plant commissioned in the US is right down the road.
Ahem, the last commercial Nuke, I believe, is Watts Bar in TN. Oh, there are more coming soon.