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

16 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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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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