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| NKS Programme Area: | NKS-R | | Research Area: | Severe accidents | | Report Number: | NKS-318 | | Report Title: | Study and comparison of data on Coolability of Particulate Beds Packed with Irregular Multi-size Particles | | Activity Acronym: | DECOSE | | Authors: | Sachin Thakre, Weimin Ma, Sevostian Bechta, | | Abstract: | Debris bed coolability is one of the important tasks of severe accident research. The key problem to study is, whether decay heat can be completely removed by the coolant ingress into the bed.
Two different types of particles were used to investigate coolability of particulate beds at VTT, Finland. The first type is irregular-shape Aluminum Oxide gravel particles whose sizes vary from 0.25 mm to 10 mm, which were employed in the STYX experiment program (2001-2008). The second type is spherical beads of Zirconium silicate whose sizes vary between 0.8 mm to 1 mm, which were used in the COOLOCE tests (Takasuo et al., 2012) to study the effect of multi-dimensional flooding on coolability. In our earlier study at KTH, the same types of particles were used. POMECO-FL and POMECO-HT facilities were employed to obtain the effective particle diameters and the dryout heat flux of the beds made up to these two types of particles. The work was intended to check the effect of heater’s orientation and diameters on the dryout heat flux.
In the present work, the data from COOLOCE are compared with that of POMECO-FL and POMECO-HT. Initially the effective particle diameters obtained from both the experiments are discussed, which is followed by the dryout heat flux comparison. It also includes the discussion over the possible factors (heaters’ geometry and porosity) affecting the coolability of the bed. | | Keywords: | Debris bed coolability, Effective particle diameter, Particulate bed, Dryout heat flux | | Publication date: | 04 Nov 2014 | | ISBN: | ISBN 978-87-7893-398-0 | | Number of downloads: | 2391 | | Download: |  NKS-318.pdf |
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