But there is still a far greater chance that someone will be human while controlling the reactor, and everyone knows all humans make mistakes. And depending on the size it won't matter. It's moving so fast that it will be so hot that it would probably cauterize the wound (I assume it would be similar to a gunshot wound, but that generally doesn't cauterize). Besides, I'm generally indoors anyhow. But who knows, it could be made of some extremely precious metal or something, and I'm told that meteors are quite valuable, regardless of what it's made of.
And unless you built it in the most disaster free areas on the planet, you may still have a meltdown. I am wondering what happens to a reactor that has a sizeable earthquake hit nearby, or perhaps for those in the United States a tornado or flood?
Murphy's Law: if anything can go wrong, it will. If a coal or gas power plant blow up, there is just a big fire. If there's a meltdown, radiation pours out everywhere.