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NKS Programme Area:NKS-R
Research Area:Thermal hydraulics
Report Number:NKS-439
Report Title:Thermal Hydraulic Phenomena of the Suppression Pool
Activity Acronym:THEOS
Authors:Pavel Kudinov, Xicheng Wang, Dmitry Grishchenko, Markku Puustinen, Antti Räsänen, Eetu Kotro, Kimmo Tielinen, Timo Pättikangas, Ari Silde,
Abstract:KTH reports further development and validation of the Effective Momentum Source and the Effective Heat Source (EMS/EHS) models for spargers using source terms and boundary conditions approaches. Fluent and GOTHIC codes have been applied in the analysis to design sparger (H2P3) and integral (H2P4) test series in PANDA facility. Results of the analysis suggest that proposed design allows to achieve test objectives and obtain PIV data needed for model development and validation from H2P3, and to reach prototypic levels of pressurization within a reasonable time in H2P4. The progress on development of the image analysis for post processing the data from the SEF-POOL tests is presented. Nine steam injection tests in SEF-POOL facility at LUT University. Analysis of the tests helps to understand the key effects and factors that can be neglected in model development. Main findings are: both the Jacob and Mach number have a significant effect; at large Ja effective momentum is significantly recued; effective momentum has a maximum at Ja ~0.02-0.04; injection hole diameter and chamfer have no significant influence on the effective momentum except for the maximum value of C, which is reached at larger values of Ja number for smaller holes. Result of VTT work suggest that the EHS/EMS models could be implemented in the Apros 6-equation model. The EHS/EMS models can increase capability of Apros for computationally efficient simulation of pool stratification/mixing phenomena in plant geometry. Simulation on thermal stratification has been done with Fluent for an experiment performed in the PPOOLEX test facility with steam injection through a vertical sparger. The effect of steam injection was modelled by using the EMS/EHS. Qualitatively correct behavior of the thermal stratification was obtained, however, pool temperature was lower than in the experiment due to the heat loss on the pool surface. Further analysis is ongoing in order improve the results.
Keywords:Steam Condensation, Pool Stratification, Mixing, Pressure Suppression Pool, Thermal Hydraulic, BWR, Containment, CFD, GOTHIC
Publication date:16 Jun 2020
ISBN:ISBN 978-87-7893-531-1
Number of downloads:42
Download:pdf NKS-439.pdf

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