Rotating equipment are replaceable is not that much of an issue they operate on regular steam.

Buildings are reinforced concrete unlikely to be a concern not in a reasonable timeframe unless rebars corrode for some reason.

Issue would be items operating with water directly in contact with the reactor, so critical piping, heat exchangers and reactor vessels, which I can’t say I am an expert specifically for nuclear plants.

I imagine the main concern would be the reactor itself as all reat can be replaced.