The NS Savanah, a nuclear hybrid cargo/passenger ship that the US made during the 'Atoms for Peace' program
Basically, two things killed her: her reactor (largely all the liability bits) and the fact that containerization was being implemented just as she was launched. The designers, surprisingly enough, put a lot of effort into making it safe (including but not limited to: overdoing the structure's strength to make it absorb impacts better, having the reactor containment vessel fill with sea water via one-way valves if the ship is going to Davy Jone's locker after an automatic SCRAM, several layers of containment to minimize radiation exposure (it was soo good in fact that it wasn't worse than
background radiation), and a lot of redundant safety systems that can SCRAM the reactor if needed).
It was also something of a speed demon, as she did far better than what her designers designed her for (she was designed for 20 knots, she sped to
24 knots).
But as I said, liability and containerization killed her.