Nuclear power has never presented the diplomatic problem posed by weapons. The US readily agreed to send a conventionally fuelled ship in 1985 when the Lange Government was looking for a way to reconcile New Zealand's Anzus partners with its nuclear ban.
The ageing destroyer the US proposed to send at that time, USS Buchanan, was almost certainly not nuclear armed but it was known to be capable of being so and that was enough for Labour's MPs and party members to bring pressure on the cabinet to refuse the visit, which it did.
It is doubtful the US at that time would have accepted a public statement on the ship's weaponry in any case but the die was cast. New Zealand was suspended from Anzus the following year.
A great deal has changed in the interim. The Cold War has ended, the US long ago told the world its surface ships no longer routinely carry nuclear weapons, New Zealand forces have gradually gained re-admission to military exercises with the US and its allies, and during all that time the warships of other nuclear-armed states, the UK and China, have occasionally visited.
They have all been subject to the same consideration under our anti-nuclear legislation, according to John Key. Their clearance attracted no public attention or protests. Will the same said when the USS Sampson arrives next month?
The fact that the US has accepted entry on New Zealand's terms at long last can be seen as a victory if we wish, but the ship should be greeted as an old friend, representing a relationship that need never have been damaged.