She moved to CBS-affiliate WTOP ( now WUSA ) in Washington , D.C. , in 1976 . Two years later , Mitchell moved to NBC 's network news operation , where she served as a general correspondent . In 1979 , she was named the NBC News energy correspondent and reported on the late-1970s energy crisis and the Three Mile Island nuclear accident . Mitchell also covered the White House from 1981 until becoming chief congressional correspondent in 1988
Three Mile Island nuclear accident
Three Mile Island accident
Andrea Mitchell