The older generations kept leaking contaminated water (reactor coolant), many harbors simply refused entry because they didn’t know the risks involved, and I’m pretty sure the decommissioning isn’t clear either. The way current laws are set up, it’s quite possible that these things go through a few hands and end up on a beach in some underdeveloped country and get dismantled like any other ship under horrible working conditions - but now with the added benefit of nuclear contamination.