Numerical simulation of the self-leveling phenomenon by modified SIMMER-III

Bin Zhang, Tatsuya Matsumoto, Koji Morita, Hidemasa Yamano, Hirotaka Tagami, Tohru Suzuki, Yoshiharu Tobita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

During a hypothetical core-disruptive accident in a sodium-cooled FBR, degraded core material can form debris beds on the core-support structure and/or in the lower inlet plenum of the reactor vessel, due to the rapid quenching and fragmentation of the core material melt. Heat convection and vaporization of the sodium will lead ultimately to leveling the debris bed that is of crucial importance to the relocation of the molten core, the recriticality evaluation and the heat removal capability of the debris bed. There is, therefore, a great need for more studies focusing on this topic, especially the much needed numerical simulation. The widely-used fast reactor safety analysis code, SIMMER-III, has difficulties in this simulation because of the lack of modeling for mechanistic interactions among particles in the current version. However, the extensive experimental analysis and the previously-proposed analytical model provide SIMMER-III the possibility of taking consideration of the extra influence of solid particles in this phenomenon. Thus, the debris fluidization model and the boiling regulation model are proposed and introduced into SIMMER-III. Calculations, by the modified SIMMER-III, against several representative experiments with typical self-leveling behavior have been performed and compared with the evaluated items recorded in experiments. The good agreements on these items suggest the modified SIMMER-III can simulate the self-leveling behavior with reasonable precision, especially on the onset of self-leveling, although further model improvement is necessary to represent the transient behavior of bed leveling more reasonably.

Original languageEnglish
Title of host publication2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages751-760
Number of pages10
Edition1
ISBN (Print)9780791844991
DOIs
Publication statusPublished - Jan 1 2012
Event2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012 - Anaheim, CA, United States
Duration: Jul 30 2012Aug 3 2012

Publication series

NameInternational Conference on Nuclear Engineering, Proceedings, ICONE
Number1
Volume5

Other

Other2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012
CountryUnited States
CityAnaheim, CA
Period7/30/128/3/12

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

Cite this

Zhang, B., Matsumoto, T., Morita, K., Yamano, H., Tagami, H., Suzuki, T., & Tobita, Y. (2012). Numerical simulation of the self-leveling phenomenon by modified SIMMER-III. In 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference, ICONE 2012-POWER 2012 (1 ed., pp. 751-760). (International Conference on Nuclear Engineering, Proceedings, ICONE; Vol. 5, No. 1). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/ICONE20-POWER2012-54684