My guess, and there's no way to know for sure, is that the Depository is well protected against nuclear attack almost up to (and possibly including) a direct hit. Strengthening it's defences surely has to have occurred in the 50+ years since it was first constructed, especially in reaction to the threat of nukes. I can imagine the US government spent a LOT of time, effort and money in the 50's and 60's hardening the facility - this has got to be easier than planning to move such a huge volume of precious metal and other items in a time of national stress and peril.
Even if the exterior was irradiated, my guess is that it wouldn't matter much - it's not like the gold was ever intended to be pulled out of storage and shipped overseas as payment for anything.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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