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Jaczko denied there is a “chilled work environment around me” and said he never attempted to intimidate anyone.

Jaczko, 41, who is a Democrat, was named to the commission by President George W. Bush and appointed chairman by Obama in May 2009. He said he has a seven-year track record of working collegially and productively with many different commissioners, members of Congress, administration officials from both parties, nuclear plant operators and members of the public.

Earlier this week, Jaczko told reporters he could not think of anything he would have done differently in the past year.

“I come to work every day to do my job better than I did the day before,” he said. “So I am sure there are things I could have done differently.”

He has not had a chance to reflect, Jaczko added, “but I’m the last person to tell you that I’m perfect, and I’m sure there are plenty of things I could have done better.”

Still, Jaczko said he was “very proud of the way this agency responded to a tremendously difficult circumstance” after the crisis in Japan.

Most of the criticism of Jaczko centers on his response to the Japan crisis and his efforts to stop the nuclear waste dump at Yucca Mountain.

Jaczko, a former aide to Senate Majority Leader Harry Reid, the Nevada Democrat who is Yucca’s leading opponent, has made a series of decisions that have aided the Obama administration’s goal of shutting down Yucca Mountain. His purported reasons for doing so have come under attack by Congress, his fellow commissioners and in-house experts as being contrary to the 1982 law that requires the NRC to review the government’s plans for an underground repository in Nevada for the country’s spent nuclear fuel.