Investigation on corium spreading over ceramic and concrete substrates in VULCANO VE-U7 experiment with moving particle semi-implicit method. (15th June 2020)

• Record Type: Journal Article
• Authors: Jubaidah, ; Duan, Guangtao; Yamaji, Akifumi; Journeau, Christophe; Buffe, Laurence; Haquet, Jean-Francois
• Is Part Of: Annals of nuclear energy. Volume 141(2020)
• Publication Date: 2020-06-15
• Subjects: Severe accident -- Corium spreading -- VULCANO VE-U7 -- Thermal contact resistance -- Gas bubble effect -- MPS method; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2019.107266
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: A novel thermal contact resistance model has been developed for the MPS method. The VULCANO VE-U7 corium spreading over ceramic and concrete channels is investigated. Inflow melt interactions at the stabilization pool is the key for the double channel spreading. Different gas bubble effects on corium spreading have been investigated in detail. Abstract: The potential reasons for the corium spreading difference over inert ceramic and reactive concrete channels of VULCANO VE-U7 experiment are investigated using Moving Particle Semi-implicit (MPS) method. A new thermal contact resistance model has been developed for MPS so that influence of the subscale heat transfer between the melt/crust and the substrate on spreading can be considered. The results indicate that the spreading difference is not much influenced by heat loss of the melt to different substrates, but more likely due to gas bubbles in the concrete channel. The most likely responsible gas bubble effect could not be well identified with the single channel analysis, because it could not consider the inflow mass interactions at the stabilization pool. The double-channel analysis with such consideration indicated enhancement of the effective thermal conductivity of the melt as the key influence of the gas bubbles that led to the difference.