So I hear all this talk about a nuclear disaster happening and I need some advice on how I am going to protect all my dwellers if this really happens.

wut

Wrong forum, perhaps?

Ok, thanks for telling us.

Good luck. Those can be tough on your skin.

The only "nuclear" disaster I've seen is an epidemic of radiation sickness due to a vault-wide drought. Keep your water in the green and your dwellers will be fine. Be sure to build up a stockpile of water, food and energy before you exit the vault.