From 1972 to 1976 Gundersen worked at the Northeast Utilities Service Corporation as a nuclear engineer ; and from 1976 to 1979 at New York State Electric & Gas as an engineering supervisor . From 1979 to 1990 Gundersen was employed at '' Nuclear Energy Services '' , a Danbury , Connecticut-based consulting firm . Gundersen served as an expert witness in the investigation of the 1979 Three Mile Island accident . He co-authored the '' DOE Decommissioning Handbook '' , First Edition ( 1981 – 82 )
Three Mile Island accident
Three Mile Island accident
Arnold Gundersen