A New Era of Nuclear Criticality Experiments: The First 10 Years of Planet Operations at NCERC

Abstract

Planet is a vertical-lift assembly machine currently located at the National Criticality Experiments Research Center (NCERC) at the Nevada National Security Site. In the past, Planet resided at Technical Area-18 in Los Alamos, New Mexico, as part of the Los Alamos Critical Experiments Facility (LACEF). Following the de-inventorying of LACEF, the Planet assembly was relocated to NCERC in 2008 and became fully operational in June of 2011. The Class Foils experiment, which involves stacking highly enriched uranium foils to obtain a critical configuration, was the first critical experiment performed on Planet. As a major component of the Nuclear Criticality Safety Class taught for the U.S. Department of Energy (DOE) Nuclear Criticality Safety Program, the Class Foils experiment allows personnel from all over the DOE complex to handle nuclear material and to complete the approach to critical safely and successfully. This paper describes the Planet vertical assembly and recent engineering upgrade and a selection of the experiments that have been performed on Planet since its transition to NCERC 10 years ago.

A New Era of Nuclear Criticality Experiments: The First 10 Years of Radiation Test Object Operations at NCERC

“…Both utilize the same SNM, personnel, detection systems, and measurement methods. For this reason, some of the experiments presented in this work may look similar to, and share SNM with, experiments on the Planet, 8 Comet, 9 Flattop, 10 and Godiva IV (Ref. 11) critical assembly machines.…”

“…Some classes also include overviews of neutron and/or gamma detection and may include radiography. Demonstrations on the Planet, 8 Comet, 9 Flattop, 10 and/or Godiva IV (Ref. 11) critical assembly machines may also be performed.…”