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NKS Programme Area:NKS-R
Research Area:Thermal Hydraulics
Report Number:NKS-450
Report Title:Thermal Hydraulic Phenomena of the Suppression Pool - Summary of 2020 activities
Activity Acronym:THEOS
Authors:Pavel Kudinov, Xicheng Wang, Dmitry Grishchenko, Markku Puustinen, Antti Räsänen, Eetu Kotro, Kimmo Tielinen, Lauri Pyy, Timo Pättikangas, Ari Silde, Jouni Syrjänen,
Abstract:Effective Momentum Source and the Effective Heat Source (EMS/EHS) models for spargers are further developed using source terms, boundary conditions and “unit cell” approaches. The models implemented in Fluent and GOTHIC have been used to support design of the sparger (H2P3) and integral (H2P4) tests series in PANDA facility in HYMERES-2 project. The progress on the image analysis for post processing the data from the SEF-POOL tests is discussed. Steam injection tests in SEF-POOL facility at LUT University were carried out to clarify effective momentum behavior at low Mach numbers with a single and multiple hole injections. Small gas bubbles and high speed stereo imaging were used in water and steam injection tests to collect data on the jet entrainment characteristics. Also, high temporal resolution data was collected on the dynamic force measurements created by the steam injection in different regimes. VTT studied stratification modeling capability of Apros 1D thermalhydralic model using pseudo-2D nodalization for the PPOOLEX SPA-T3 test. The simulations showed that (i) dense nodalisation is needed to capture the sharp stratification (ii) pool mixing phase could not be predicted reasonably without a tailored to Apros’s approach. The EMS/EHS, volume of fluid (VOF) and k-ω were combined in the ANSYS Fluent v.19.5 simulation of SPA-T3 test. The simulation underpredicted the mixing of pool water to some degree. When the EMS/EHS source location was extended for the mixing phase simulation, the mixing improved considerably.
Keywords:Steam Condensation, Pool Stratification, Mixing, Pressure Suppression Pool, Thermal Hydraulic, BWR, Containment, CFD, GOTHIC
Publication date:01 Sept 2021
ISBN:978-87-7893-542-7
Number of downloads:84
Download:pdf NKS-450.pdf

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