Numerical modelling of condensation pool (NUMPOOL)

NUMPOOL summary report

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Abstract

Numerical methods for analyzing pressure suppression pools in boiling water reactors are developed. Some of the first experiments performed with the PPOOLEX facility are analysed with computational fluid dynamics (CFD) and Fluid-Structure Interaction (FSI) simulations. PPOOLEX vessel is a scaled-down model of a boiling water reactor containment with pressurized drywell and wetwell compartments. The compartments are connected with a vent pipe, whose outlet was submerged in a water pool of the wetwell. In the first experiments, air was blown into the drywell of the pressurized PPOOLEX vessel. The experiments and modelling are continued with steam discharges. Simulation of an air discharge was performed by using the Fluent CFD code. The pressurization of the drywell, clearance of the vent pipe and pressurization of the wet well during the first tens of seconds of the experiment are resolved. The bubble dynamics at the outlet of the vent pipe is studied in some detail. The results are compared to measurements in the PPOOLEX experiment. FSI analyses of the POOLEX and PPOOLEX experiments are performed, where the Star-CD CFD code and ABAQUS structural analysis code are coupled with MpCCI software. A linear perturbation method is used for preventing numerical instability which occurs in the pool simulations with explicit FSI coupling. The calculations shows that FSI may have to be accounted for in simulating blowdown in pressure suppression pools.
Original languageEnglish
Title of host publicationSAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010
Subtitle of host publicationInterim Report
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages160-172
ISBN (Electronic)978-951-38-7267-0
ISBN (Print)978-951-38-7266-3
Publication statusPublished - 2009
MoE publication typeNot Eligible

Publication series

NameVTT Tiedotteita - Research Notes
PublisherVTT
Number2466
ISSN (Print)1235-0605
ISSN (Electronic)1455-0865

Fingerprint

Condensation
Fluid structure interaction
Vents
Computational fluid dynamics
Boiling water reactors
Pressurization
Experiments
Pipe
Discharge (fluid mechanics)
ABAQUS
Air
Structural analysis
Stars
Numerical methods
Steam
Water

Cite this

Pättikangas, T., Niemi, J., & Timperi, A. (2009). Numerical modelling of condensation pool (NUMPOOL): NUMPOOL summary report. In SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010 : Interim Report (pp. 160-172). Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2466
Pättikangas, Timo ; Niemi, Jarto ; Timperi, Antti. / Numerical modelling of condensation pool (NUMPOOL) : NUMPOOL summary report. SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010 : Interim Report. Espoo : VTT Technical Research Centre of Finland, 2009. pp. 160-172 (VTT Tiedotteita - Research Notes; No. 2466).
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abstract = "Numerical methods for analyzing pressure suppression pools in boiling water reactors are developed. Some of the first experiments performed with the PPOOLEX facility are analysed with computational fluid dynamics (CFD) and Fluid-Structure Interaction (FSI) simulations. PPOOLEX vessel is a scaled-down model of a boiling water reactor containment with pressurized drywell and wetwell compartments. The compartments are connected with a vent pipe, whose outlet was submerged in a water pool of the wetwell. In the first experiments, air was blown into the drywell of the pressurized PPOOLEX vessel. The experiments and modelling are continued with steam discharges. Simulation of an air discharge was performed by using the Fluent CFD code. The pressurization of the drywell, clearance of the vent pipe and pressurization of the wet well during the first tens of seconds of the experiment are resolved. The bubble dynamics at the outlet of the vent pipe is studied in some detail. The results are compared to measurements in the PPOOLEX experiment. FSI analyses of the POOLEX and PPOOLEX experiments are performed, where the Star-CD CFD code and ABAQUS structural analysis code are coupled with MpCCI software. A linear perturbation method is used for preventing numerical instability which occurs in the pool simulations with explicit FSI coupling. The calculations shows that FSI may have to be accounted for in simulating blowdown in pressure suppression pools.",
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Pättikangas, T, Niemi, J & Timperi, A 2009, Numerical modelling of condensation pool (NUMPOOL): NUMPOOL summary report. in SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010 : Interim Report. VTT Technical Research Centre of Finland, Espoo, VTT Tiedotteita - Research Notes, no. 2466, pp. 160-172.

Numerical modelling of condensation pool (NUMPOOL) : NUMPOOL summary report. / Pättikangas, Timo; Niemi, Jarto; Timperi, Antti.

SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010 : Interim Report. Espoo : VTT Technical Research Centre of Finland, 2009. p. 160-172 (VTT Tiedotteita - Research Notes; No. 2466).

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

TY - CHAP

T1 - Numerical modelling of condensation pool (NUMPOOL)

T2 - NUMPOOL summary report

AU - Pättikangas, Timo

AU - Niemi, Jarto

AU - Timperi, Antti

PY - 2009

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N2 - Numerical methods for analyzing pressure suppression pools in boiling water reactors are developed. Some of the first experiments performed with the PPOOLEX facility are analysed with computational fluid dynamics (CFD) and Fluid-Structure Interaction (FSI) simulations. PPOOLEX vessel is a scaled-down model of a boiling water reactor containment with pressurized drywell and wetwell compartments. The compartments are connected with a vent pipe, whose outlet was submerged in a water pool of the wetwell. In the first experiments, air was blown into the drywell of the pressurized PPOOLEX vessel. The experiments and modelling are continued with steam discharges. Simulation of an air discharge was performed by using the Fluent CFD code. The pressurization of the drywell, clearance of the vent pipe and pressurization of the wet well during the first tens of seconds of the experiment are resolved. The bubble dynamics at the outlet of the vent pipe is studied in some detail. The results are compared to measurements in the PPOOLEX experiment. FSI analyses of the POOLEX and PPOOLEX experiments are performed, where the Star-CD CFD code and ABAQUS structural analysis code are coupled with MpCCI software. A linear perturbation method is used for preventing numerical instability which occurs in the pool simulations with explicit FSI coupling. The calculations shows that FSI may have to be accounted for in simulating blowdown in pressure suppression pools.

AB - Numerical methods for analyzing pressure suppression pools in boiling water reactors are developed. Some of the first experiments performed with the PPOOLEX facility are analysed with computational fluid dynamics (CFD) and Fluid-Structure Interaction (FSI) simulations. PPOOLEX vessel is a scaled-down model of a boiling water reactor containment with pressurized drywell and wetwell compartments. The compartments are connected with a vent pipe, whose outlet was submerged in a water pool of the wetwell. In the first experiments, air was blown into the drywell of the pressurized PPOOLEX vessel. The experiments and modelling are continued with steam discharges. Simulation of an air discharge was performed by using the Fluent CFD code. The pressurization of the drywell, clearance of the vent pipe and pressurization of the wet well during the first tens of seconds of the experiment are resolved. The bubble dynamics at the outlet of the vent pipe is studied in some detail. The results are compared to measurements in the PPOOLEX experiment. FSI analyses of the POOLEX and PPOOLEX experiments are performed, where the Star-CD CFD code and ABAQUS structural analysis code are coupled with MpCCI software. A linear perturbation method is used for preventing numerical instability which occurs in the pool simulations with explicit FSI coupling. The calculations shows that FSI may have to be accounted for in simulating blowdown in pressure suppression pools.

M3 - Chapter or book article

SN - 978-951-38-7266-3

T3 - VTT Tiedotteita - Research Notes

SP - 160

EP - 172

BT - SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Pättikangas T, Niemi J, Timperi A. Numerical modelling of condensation pool (NUMPOOL): NUMPOOL summary report. In SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010 : Interim Report. Espoo: VTT Technical Research Centre of Finland. 2009. p. 160-172. (VTT Tiedotteita - Research Notes; No. 2466).