The German unit of Vattenfall has said the managing director of Vattenfall Europe Nuclear Energy, Bruno Thomauske, has been dismissed by the company following incidents at two of the plants it operates.
The company’s head of communications Johannes Altmeppen has also been sacked.
The German government threatened to withdraw Vattenfall’slicence to operate nuclear power stations after a fire at the Kruemmel plant near Hamburg, and a short circuit at another German facility.
Vattenfall initially denied the Kruemmel blaze went anywhere near the atomic reactor - a claim the state investigators refuted.
The state authorities criticised Vattenfall for being too late on giving information about these incidents, although Vattenfall denied a cover-up.
Last week, German Chancellor Angela Markel entered the row by demanding an explanation from Vattenfall.