Ablation and melting relocation of hemisphere vessel due to natural convection

Masahiro Furuya, Yoshiaki Oka

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

In order to investigate ablation failure mode of lower head with molten core during a severe accident of light water reactors, ablation and melting relocation experiments were conducted with a hemisphere vessel with a drain hole. Three different silicone oil were used to investigate an effect of fluid viscosity to simulate a molten core. The hemisphere vessel is molded with lead bismuth eutectic alloy. The vessel wall thinning and melt relocation occurred just below the silicone oil level by ablation due to natural convection. For the lower-viscosity silicone oil, it results in breaking all around the vessel wall. On the contrary for the higher-viscosity silicone oil, the drain hole were ablated as well which enhance drainage flow. The time series of ablated molten wall and silicone oil weights drained from the hole were quantified separately on the basis of measured volume and weight of drained fluids for the code validation.

Original languageEnglish
Publication statusPublished - 2015 Jan 1
Externally publishedYes
Event23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015 - Chiba, Japan
Duration: 2015 May 172015 May 21

Conference

Conference23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015
CountryJapan
CityChiba
Period15/5/1715/5/21

Keywords

  • Ablation
  • Lower head failure
  • Melting
  • Natural convection
  • Penetration
  • Reactor pressure vessel
  • Relocation

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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  • Cite this

    Furuya, M., & Oka, Y. (2015). Ablation and melting relocation of hemisphere vessel due to natural convection. Paper presented at 23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015, Chiba, Japan.