Oak Ridge Today Posted at NPO serves as the federal oversight organization for the Pantex Plant and Y-12 National Security Complex The National Nuclear Security Administration has named Teresa M. Robbins as field office manager for the NNSA Production Office, or NPO. NPO serves as the federal oversight organization for the Pantex Plant in Amarillo, Texas, and the Y-12 National Security Complex in Oak Ridge, Tennessee. Robbins served as NPO deputy manager for the past six years, and she has more than 29 years of experience in nuclear facility operations, engineering, safety analysis, maintenance, and risk analysis at U.S. Department of Energy sites.