Rocky Flats Special Exposure Cohort Act - Amends the Energy Employees Occupational Illness Compensation Program Act of 2000 to amend the definition of a "member of the Special Exposure Cohort" for purposes of such Program to include persons who were employed by the Department of Energy (DOE) or a DOE contractor or subcontractor for an aggregate of at least 250 work days before January 1, 2006, at the Rocky Flats site in Colorado.