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

    Keywords

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

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