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NKS Programme Area:NKS-R
Research Area:Thermal hydraulics
Report Number:NKS-308
Report Title:CFD and FEM simulations of pressure suppression pool behaviour
Activity Acronym:ENPOOL
Authors:Antti Timperi, Timo Pättikangas, Jarto Niemi,
Abstract:“The large interface model” published recently by P. Coste has been studied. The interface tracking model of Coste has been implemented in Fluent. The direct-contact condensation model has been modified so that the grid cells adjacent to the interface cell are also used in the heat transfer calculation. Simulations of short period of the chugging phase of the PPOOLEX experiment MIX-03 have been performed. Modelling of the PPOOLEX experiment COL-01 has been performed with the acoustic-structural FEM model. Different values for the pool structural damping were first tested to find a damping value giving best agreement with the experiment. Simulations with three different values of water sonic speed have been performed and compared with the experiment. The effects of including the drywell gas to the acoustic model and applying the pressure source at the vent pipe outlet have been studied. Studies of scaling of the measurements to full scale geometry have been performed. Simulations of the beginning of the blowdown have been performed with the new Star-CCM+ code and compared with the scaling results from 2012. Oscillation frequency of the water surface in the vent pipe has also been studied with an analytical model. The oscillation frequency has been calculated with Star-CCM+ and compared with the analytical results. The coefficients for the Rayleigh damping of the structure have been studied. A mesh sensitivity study has been performed. Characterization of the pressure pulse has been started; simulations with different shapes of pressure pulses have been performed to study the effect of the shape. Convergence of the containment response statistics has been examined by evaluating the statistics for signals of different length.
Keywords:Condensation pool, pressure suppression pool, BWR, CFD, fluid-structure interaction, FSI, chugging, LOCA
Publication date:01 Jun 2014
ISBN:ISBN 978-87-7893-386-7
Number of downloads:2358
Download:pdf NKS-308.pdf
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