Not actually true.
Three men were killed in an accident at the National Reactor Testing Station located about 40 miles west of Idaho Falls, ID on January 3, 1961 when the SL-1 experimental low power reactor exploded, releasing about 1,100 curies of fission products into the atmosphere.
This accident caused a change in the design of all subsequent reactors so that the removal of any single control rod could not cause the reactor to go critical.
It's an interesting incident. Check out SL-1 at Wikipedia.
You're correct; I'll have to reword that to all the active nuclear power plant accidents.