Re: Well
...it's a huge task to burrow down to the reactor spaces to get to the tea kettle for major service/refueling.
I think that's a design challenge that's true for pretty much any propulsion on a large ship. I saw a vide where a large ferry needed a diesel engine gearbox replacing, and it was much the same. First cut a large hole through the decks so the gearbox could be lifted out. I guess that's a bigger challenge for warships given you'd also want to protect your propulsion systems well.