For the uninitiated, nuclear power is actually much, much safer than it was in the previous century, and fossil fuel power plants have killed exponentially more people through pollution than all nuclear power accidents combined – it's just not something that happens all at once so it doesn't seem like a big deal to most people. We will not be able to "defeat" climate change and keep this planet inhabitable for future…
We have Hyman G. Rickover, Admiral in the US Navy to thank for steering nuclear energy research away from thorium to uranium. He very much wanted the Navy to be in command of nuclear wessels carrying nuclear missiles. If I can remember correctly from research in US energy policy history in college, the US had sunk about 10 years into thorium reactor research when Hyman came along. Seems rather important to not ignore…
Well that's not true:
"An American nuclear-powered submarine leaked radiation for more than two years, releasing the bulk of the material in its home port of Guam and at Pearl Harbor, Japanese and U.S. officials said Thursday."[1]
There was also the A4 that fell off an aircraft carrier with 3 nuclear bombs on board, which were never recovered[2].
Both the USS Thresher and USS Scorpion sunk and haven't had their nuclear reactors or weapons recovered. They do appear to remain intact though.
[1] https://www.seattletimes.com/nation-world/nuclear-subs-radia...
[2] https://en.wikipedia.org/wiki/1965_Philippine_Sea_A-4_incide...