Conference Proceedings Paper
Separate-Effects Experiments on the Hydrodynamics of Air Ingress Phenomena for the Very High Temperature Reactor
NURETH-14 - 2011 September 25-30
Seungjin Kim (The Pennsylvania State University)
Justin Talley (The Pennsylvania State University)
Mohan Yadav (The Pennsylvania State University)
Andrew Ireland (US Nuclear Regulatory Commission)
Stephen M. Bajorek (U.S. Nuclear Regulatory Commission)
The present study performs scaled separate-effects experiments to investigate the
hydrodynamics in the air-ingress phenomena following a Depressurized Condition Cooldown in
the Very High Temperature Gas-Cooled Reactor. First, a scoping experiment using water and
brine is performed. The volumetric exchange rate is measured using a hydrometer, and flow
visualizations are performed. Next, Helium-air experiments are performed to obtain threedimensional
oxygen concentration transient data using an oxygen analyzer. It is found that there
exists a critical density difference ratio, before which the ingress rate increases linearly with time
and after which the ingress rate slows down significantly. In both the water-brine and Helium-air
experiments, this critical ratio is found to be approximately 0.7.
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