Phenomena associated with jet-plume condensation of steam-air mixtures in a large subcooled pool of water have implications in predicting global system parameters, such as the containment pressure, in light water reactors. A scaled down, reduced pressure suppression pool was designed to study condensation and mixing phenomena using scaled test conditions obtained from RELAP5 code results of a loss of coolant accident in a simplified boiling water reactor. Results from the experiments were compared with the TRACE code predictions which reveal deficiencies in the code to predict the pool thermal stratification as TRACE was not initially developed for predicting such phenomena. A dimensionless boundary map was plotted from several experimental runs of pure steam injection to determine conditions when the pool transits from being a homogeneously mixed volume to being a thermally stratified one. Steam-air mixture injection cases for single horizontal venting indicated that above a pool temperature of 40 °C with air mass flow rates below 0.1 g/s the pool can attain thermal stratification.
Volume Subject Area:
Nuclear Engineering
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