For the creation of an experimental database related to physical phenomena relevant for LWR containment safety, tests are performed in MISTRA (CEA, France) and PANDA (PSI, Switzerland) facilities in the frame of the OECD/SETH-2 project. The specific purpose of these tests is to obtain data suitable to improve and validate advanced Lumped Parameter (LP) codes as well as codes with 3D capabilities with respect to the prediction of post-accident containment thermal-hydraulic conditions. The experimental data is related to hydrogen transport within containment compartments. In particular, the effect of mass sources (the release of steam and hydrogen), heat sources (hydrogen-oxygen recombiner), and heat sinks (condensation of steam caused by containment coolers and sprays or “cold” wall) on the break-up/erosion of an initially gas stratified configuration characterized by a layer with a high hydrogen content. Helium is used to simulate hydrogen in the PANDA facility. This paper presents the result of a series of SETH-2 PANDA tests attributed to “vertical fluid release” (plumes or jets). Two large containment compartments (∼180 m3) connected by a bended pipe of ∼1 m diameter are used for these tests. For all the tests, a helium-steam mixture having a thickness of 2 m is created in the upper volume of one compartment while the remaining volume is filled with steam. During the tests, steam jets or plumes are created by injecting steam from a vertical pipe located at the center of the vessel 2 m below the helium-steam mixture. The jet or plume is initially positively buoyant and becomes negatively buoyant once it reaches the helium-steam layer. These transient tests show the degradation of the helium-steam layer for different jet Reynolds numbers. The initial Froude number at the injection pipe varied in the range of ∼3 to ∼9, while the estimated Froude number at the helium-steam mixture/steam interface varied from ∼0.70 to ∼2.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4352-9
PROCEEDINGS PAPER
Break-Up of Gas Stratification in LWR Containment Induced by Negatively Buoyant Jets and Plumes Available to Purchase
Ralf Kapulla,
Ralf Kapulla
Paul Scherrer Institut (PSI), Villigen, Switzerland
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Domenico Paladino,
Domenico Paladino
Paul Scherrer Institut (PSI), Villigen, Switzerland
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Guillaume Mignot,
Guillaume Mignot
Paul Scherrer Institut (PSI), Villigen, Switzerland
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Robert Zboray,
Robert Zboray
Paul Scherrer Institut (PSI), Villigen, Switzerland
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Sanjeev Gupta
Sanjeev Gupta
Paul Scherrer Institut (PSI), Villigen, Switzerland
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Ralf Kapulla
Paul Scherrer Institut (PSI), Villigen, Switzerland
Domenico Paladino
Paul Scherrer Institut (PSI), Villigen, Switzerland
Guillaume Mignot
Paul Scherrer Institut (PSI), Villigen, Switzerland
Robert Zboray
Paul Scherrer Institut (PSI), Villigen, Switzerland
Sanjeev Gupta
Paul Scherrer Institut (PSI), Villigen, Switzerland
Paper No:
ICONE17-75708, pp. 657-666; 10 pages
Published Online:
February 25, 2010
Citation
Kapulla, R, Paladino, D, Mignot, G, Zboray, R, & Gupta, S. "Break-Up of Gas Stratification in LWR Containment Induced by Negatively Buoyant Jets and Plumes." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 2: Structural Integrity; Safety and Security; Advanced Applications of Nuclear Technology; Balance of Plant for Nuclear Applications. Brussels, Belgium. July 12–16, 2009. pp. 657-666. ASME. https://doi.org/10.1115/ICONE17-75708
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