 Bryukhanov ignored and failed to acknowledge the radioactive leak that occurred on September 9, 1982 when steam rose through a vent stack shared by reactors 1 and 2, indicating at least one broken pipe.The radioactive contaminants had spread fourteen kilometers from the plant and reached Pripyat.Bryukhanov also postponed an outstanding time-consuming safety test of reactor 4 so as to meet Moscow's launch deadline of December 31, 1983.