Modeling of Two-Phase Natural Convection Flows in a Water Pool with a Decay-Heated Debris Bed
2008 (English)In: Proceedings of International Congress on Advances in Nuclear Power Plants (ICAPP 2008), 2008Conference paper (Refereed)
Coolability of a debris bed in a water pool is studied numerically with the emphasis on the effects of natural convection flows driven by vapor release in the porous bed. A multifluid computer code DECOSIM is developed and applied to the simulation of liquid-vapor flows in the saturated conditions relevant to the long transient of the debris bed formation and coolability problems. Numerical calculations carried out reveal the influence of the debris bed shape on the structure of natural circulation flows in the water pool, as well as on the void fraction distributions inside the debris bed. The effect of large scale flow structures in the pool on transport of debris particles is demonstrated. It is shown that the vortical flow can capture the smaller particle which may result in considerable spreading of the sedimented debris over the pool floor.
Place, publisher, year, edition, pages
Computer codes, Coolability, Debris bed, Debris particles, Large-scale flow structure, Liquid-vapor flows, Multi-fluids, Natural circulation, Natural convection flow, Numerical calculation, Porous bed, Saturated conditions, Void fraction distribution, Vortical flows, Water pools
IdentifiersURN: urn:nbn:se:kth:diva-53791ScopusID: 2-s2.0-70349970186ISBN: 9781605607870OAI: oai:DiVA.org:kth-53791DiVA: diva2:470975
International Congress on Advances in Nuclear Power Plants (ICAPP 2008), 8-12 June 2008, Anaheim, California, USA
QC 20120109. Paper Number: 84092011-12-302011-12-302014-10-13Bibliographically approved