The COOLOCE experiments investigating the dryout power in debris beds of heap-like and cylindrical geometries

Eveliina Takasuo (Corresponding Author), Stefan Holmström, Tuomo Kinnunen, Pekka H. Pankakoski

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    The COOLOCE test facility has been used for experimental investigations of the coolability of porous core debris beds with different geometries. The main objective of the experiments was to compare the dryout behavior of conical (heap-like) and top-flooded cylindrical (evenly distributed) debris bed configurations in order to investigate the effect of geometry on the coolability of the debris bed. The experimental debris beds simulate the possible outcomes of melt discharge from the reactor pressure vessel and the formation of a core debris bed in a deep water pool during a severe accident. The results suggest that if the two debris bed configurations have equal height, the coolability of the conical bed is improved compared to the cylindrical bed due to the multi-dimensional infiltration of water through the surface of the cone. However, in case the conical and cylindrical debris beds have equal diameter and volume, the dryout power density of the conical configuration is lower than that of the cylindrical configuration by approximately 50%. This is due to the greater height of the conical configuration which leads to increased heat flux in the upper parts of the conical debris bed. According to the present results, the effect of the increased debris bed height is greater than the effect of multi-dimensional flooding. Simulations show the differences between the two-phase flow behavior of the two geometries, and the resulting difference in dryout development.
    Original languageEnglish
    Pages (from-to)687-700
    Number of pages13
    JournalNuclear Engineering and Design
    Volume250
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

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    debris
    Debris
    beds
    geometry
    Geometry
    experiment
    Experiments
    two phase flow
    heat flux
    accident
    vessel
    infiltration
    deep water
    flooding
    melt
    configurations
    simulation
    effect
    Water
    Test facilities

    Cite this

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    title = "The COOLOCE experiments investigating the dryout power in debris beds of heap-like and cylindrical geometries",
    abstract = "The COOLOCE test facility has been used for experimental investigations of the coolability of porous core debris beds with different geometries. The main objective of the experiments was to compare the dryout behavior of conical (heap-like) and top-flooded cylindrical (evenly distributed) debris bed configurations in order to investigate the effect of geometry on the coolability of the debris bed. The experimental debris beds simulate the possible outcomes of melt discharge from the reactor pressure vessel and the formation of a core debris bed in a deep water pool during a severe accident. The results suggest that if the two debris bed configurations have equal height, the coolability of the conical bed is improved compared to the cylindrical bed due to the multi-dimensional infiltration of water through the surface of the cone. However, in case the conical and cylindrical debris beds have equal diameter and volume, the dryout power density of the conical configuration is lower than that of the cylindrical configuration by approximately 50{\%}. This is due to the greater height of the conical configuration which leads to increased heat flux in the upper parts of the conical debris bed. According to the present results, the effect of the increased debris bed height is greater than the effect of multi-dimensional flooding. Simulations show the differences between the two-phase flow behavior of the two geometries, and the resulting difference in dryout development.",
    author = "Eveliina Takasuo and Stefan Holmstr{\"o}m and Tuomo Kinnunen and Pankakoski, {Pekka H.}",
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    The COOLOCE experiments investigating the dryout power in debris beds of heap-like and cylindrical geometries. / Takasuo, Eveliina (Corresponding Author); Holmström, Stefan; Kinnunen, Tuomo; Pankakoski, Pekka H.

    In: Nuclear Engineering and Design, Vol. 250, 2012, p. 687-700.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Holmström, Stefan

    AU - Kinnunen, Tuomo

    AU - Pankakoski, Pekka H.

    PY - 2012

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    AB - The COOLOCE test facility has been used for experimental investigations of the coolability of porous core debris beds with different geometries. The main objective of the experiments was to compare the dryout behavior of conical (heap-like) and top-flooded cylindrical (evenly distributed) debris bed configurations in order to investigate the effect of geometry on the coolability of the debris bed. The experimental debris beds simulate the possible outcomes of melt discharge from the reactor pressure vessel and the formation of a core debris bed in a deep water pool during a severe accident. The results suggest that if the two debris bed configurations have equal height, the coolability of the conical bed is improved compared to the cylindrical bed due to the multi-dimensional infiltration of water through the surface of the cone. However, in case the conical and cylindrical debris beds have equal diameter and volume, the dryout power density of the conical configuration is lower than that of the cylindrical configuration by approximately 50%. This is due to the greater height of the conical configuration which leads to increased heat flux in the upper parts of the conical debris bed. According to the present results, the effect of the increased debris bed height is greater than the effect of multi-dimensional flooding. Simulations show the differences between the two-phase flow behavior of the two geometries, and the resulting difference in dryout development.

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