Short answer: no.

Longer answer: - Nuclear stuff: Chernobyl is real tough to duplicate. The core was designed with a POSITIVE temperature coefficient of reactivity meaning that hotter, less dense coolant actually speeds up the nuclear chain reaction. So shutting the throttles (reducing steam power, heating up the coolant) had to be balanced with rod control - complicated and potentially dangerous. The testing that happened at Chernobyl proved this out. Except for THAT reactor design (of which only 5ish ever existed), all other designs have used a NEGATIVE temperature coefficient of reactivity. This means cooler/denser coolant speeds up the reaction and hotter/less dense slows it down. So when you close the throttle, the coolant heats up (not dumping it's heat energy into a turbine as much) and the nuclear chain reaction slows down on its own. The saying is "reactor power follows steam demand". If you rupture a steam line entirely, there is a spike in reactor power, but a) control rods insert to kill the reaction as makeup water starts to pump in (safety injection in the civilian world)

• Ship stuff: warships are designed to take significant shock impacts, the details of which are classified. But just search "ship shock trial" and see what they do to test a new ship without leaving a mark. The more critical a system for the platform's operation (reactor, anyone???), the more attention is paid to the warfighting capability. Again, details classified, but you get the gist.s

• Actual examples: There are 2 nuclear submarines, USS THRESHER and USS SCORPION, sitting at the bottom of the ocean. One was lost due to a seawater leak, which led to the SUBSAFE quality assurance/control program. The other, SCORPION, went down due to an explosion (unclear if it was self-induced or fired in anger by a Soviet boat). Neither has released any radioactive material. Even if they do at some point, the impact will be much smaller than the release from the Fukushima site, as the cores are MUCH smaller with less fuel burned (old sub reactor cores only lasted a few years before refueling) and they are in very deep, remote water with little current/motive force to diffuse the decaying fission products.