Oh lord, I hope they don't exprience accidents much. I don't think they'd post it anyplace either if they did.
If everyone knows what they're doing, there shouldn't be much like that.
I'll haul out the theater angle here again to give you the idea of types of injuries I've seen on stage in ten years. I've seen a few injuries: Broken toes from a platform that fell apart, broken leg when a truck was being unloaded, broken thumb from being in the way of a slipstage, sliced hand from a bandsaw. I've fallen off ladders. Seen other folks fall off ladders. I've electrocuted myself. And I've given myself a concussion running into a pipe.
I've seen more almost-accidents: a ladder nearly swung round and knocking someone seriously, a spotlight frame falling off a rope and hitting the deck where people were standing, a barndoor comming loose while an actor was under the light, badly weighted scenic systems getting out of hand, a winched backdrop catching a ladder and nearly sending it into the seats.
This stuff happens to crew more than actors. I've heard a story about a stage collapse nearly killing some actors in Chicago two years ago, but it was found out that it was a bad design and the city would not have approved it's use if the inspectors had known about the tourning company using it. (or that was the story the inspector used to divert blame... but I digress...) I feel good not having been in a show where something injures an actor like that. But I've known a few crew sporting casts and bandages. But dollars to doughnuts they'd have avoided it if they'd thought twice about what they were doing. And every show needs a good Technical Director.
I expect the SG actors are almost never around for the set-up part where these things can happen in. They're carted in solely for filming and then wander away while stuff is changed around. But, we do see them with guns and explosives. For much of that it's the stunt men and stand-ins working. The principals are worth too much to put in something overly dangerous. Like the story about RDA said: they'll get injured out in their day-to-day lives, when they don't have their people minding them.