I would not want to be on a boat with a liquid sodium reactor. Sodium reacts violently with water, so any damage to a submarine with such a reactor that allows water into reactor by combat damage might cause a mini-Chernobyl.
The Russians in the Cold War had an almost unlimited budget for weapons programs -- they ignored safety concerns in many areas.
The rocket torpedo sinking on August 12 (year I forget) is an example. I believe that sub went down because of trying to launch one of those, and there are rumors that the rocket torpedoes blew up inside the submarine.
The submarine Kursk just before midnight August 12, 2000.
Reports show there were two explosions. It is rumored they were working on a rocket torpedo.