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Science and Technology of Nuclear Installations
Volume 2008, Article ID 453621, 5 pages
Research Article

Flow Stagnation under Single and Two-Phase Natural Circulation Conditions in the APEX-CE Test Facility

Department of Nuclear Engineering, The College of Engineering, Radiation Center, Oregon State University, Corvallis, OR 97331-4501, USA

Received 30 May 2007; Accepted 29 February 2008

Academic Editor: John Cleveland

Copyright © 2008 José N. Reyes Jr. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Natural circulation experiments were conducted at Oregon State University using the advanced plant experiment (APEX-CE) integral system test facility as configured to simulate a typical Combustion Engineering nuclear steam supply system. This paper describes the mechanisms by which natural circulation flow was interrupted under single-phase and two-phase natural circulation conditions in APEX-CE.