Yes and when it does it http://i.imgur.com/l5i7eAh.jpg.
Aww fiddle missed that. I highly doubt that effects it because when you don't have one they come anyway. It's an incedent not a feature of the radio station.
Wait, really? You can tap that and then have raiders show up instead of new dwellers? That is rough.
It wery well might be - when my radio room was functional, i seemed to get only raider attacks as accidents. Fire and Roaches are very rare and i don't Rush rooms unless they have less than 20% chance of failure(failure after rushing a room brings level of happiness down), so the rush accidents are extremely rare for me. Now my radio room is inactive and i get roaches and fire accidens more frequent than before... but they START quite frequently in an empty radio room lol.