Modeling of dryout in core debris beds of conical and cylindrical geometries

Eveliina Takasuo, Ville Hovi, Mikko Ilvonen, Stefan Holmström

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Abstract

A porous particle bed consisting of core debris may be formed as a result of a core melt accident in a nuclear power plant. The coolability of conical (heap-like) and cylindrical (evenly-distributed) ex-vessel debris beds have been investigated in the COOLOCE experiments at VTT. The experiments have been modeled by using the MEWA severe accident analysis code. The main objectives of the modeling were (1) to validate the simulation results against the experiments by comparing the dryout power density predicted by the code to the experimental results and (2) to evaluate the effect of geometry on the coolability by examining the flow field and the development of dryout in the two geometries. In addition to the MEWA simulations, 3D demonstration calculations of the particle bed dryout process have been performed using the in-house code PORFLO. It was found that the simulation and experimental results are in a relatively good agreement. The results suggest that the coolability of the conical debris bed is poorer than that of the cylindrical bed due to the greater height of the conical configuration
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
Place of PublicationNew York, NY, USA
PublisherAmerican Society of Mechanical Engineers ASME
Pages291-300
ISBN (Print)978-0-7918-4498-4
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference - Anaheim, California, United States
Duration: 30 Jul 20123 Aug 2012

Conference

Conference20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
CountryUnited States
CityAnaheim, California
Period30/07/123/08/12

Fingerprint

geometry
accident
modeling
simulation
experiment
nuclear power plant
flow field
vessel
melt
code
particle
analysis
calculation
effect

Keywords

  • Core debris
  • coolability
  • severe accident
  • nuclear power
  • MEWA simulations

Cite this

Takasuo, E., Hovi, V., Ilvonen, M., & Holmström, S. (2012). Modeling of dryout in core debris beds of conical and cylindrical geometries. In Proceedings: 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference (pp. 291-300). New York, NY, USA: American Society of Mechanical Engineers ASME.
Takasuo, Eveliina ; Hovi, Ville ; Ilvonen, Mikko ; Holmström, Stefan. / Modeling of dryout in core debris beds of conical and cylindrical geometries. Proceedings: 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. New York, NY, USA : American Society of Mechanical Engineers ASME, 2012. pp. 291-300
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Takasuo, E, Hovi, V, Ilvonen, M & Holmström, S 2012, Modeling of dryout in core debris beds of conical and cylindrical geometries. in Proceedings: 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. American Society of Mechanical Engineers ASME, New York, NY, USA, pp. 291-300, 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference , Anaheim, California, United States, 30/07/12.

Modeling of dryout in core debris beds of conical and cylindrical geometries. / Takasuo, Eveliina; Hovi, Ville; Ilvonen, Mikko; Holmström, Stefan.

Proceedings: 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. New York, NY, USA : American Society of Mechanical Engineers ASME, 2012. p. 291-300.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - A porous particle bed consisting of core debris may be formed as a result of a core melt accident in a nuclear power plant. The coolability of conical (heap-like) and cylindrical (evenly-distributed) ex-vessel debris beds have been investigated in the COOLOCE experiments at VTT. The experiments have been modeled by using the MEWA severe accident analysis code. The main objectives of the modeling were (1) to validate the simulation results against the experiments by comparing the dryout power density predicted by the code to the experimental results and (2) to evaluate the effect of geometry on the coolability by examining the flow field and the development of dryout in the two geometries. In addition to the MEWA simulations, 3D demonstration calculations of the particle bed dryout process have been performed using the in-house code PORFLO. It was found that the simulation and experimental results are in a relatively good agreement. The results suggest that the coolability of the conical debris bed is poorer than that of the cylindrical bed due to the greater height of the conical configuration

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Takasuo E, Hovi V, Ilvonen M, Holmström S. Modeling of dryout in core debris beds of conical and cylindrical geometries. In Proceedings: 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. New York, NY, USA: American Society of Mechanical Engineers ASME. 2012. p. 291-300