A multiphase MPS method coupling fluid–solid interaction/phase-change models with application to debris remelting in reactor lower plenum

Guangtao Duan*, Akifumi Yamaji, Mikio Sakai

*この研究の対応する著者

研究成果: Article査読

抄録

In a postulated severe accident, the in-vessel debris remelting may result in severe local hot spots, probably threatening the reactor pressure vessel (RPV). The moving particle semi-implicit (MPS) method has great potential for simulating such complicated phenomena. To simulate debris remelting, the models for fluid–solid interactions and solid–solid collisions are coupled into an improved MPS method. A new speedup algorithm that can consider the flow and heat-transfer simulations separately is proposed to handle the multi-time-scale problem in debris remelting. The influence of debris size and decay heat power on the occurrence of local hot spots and RPV breach patterns during debris melting was investigated. It is found that (1) large debris blocks tended to result in severe local hot spots probably causing a lower breach point and (2) high decay power might cause the migration of local hot spots probably producing limited ablation to the vicinity of the RPV wall.

本文言語English
論文番号108697
ジャーナルAnnals of Nuclear Energy
166
DOI
出版ステータスPublished - 2022 2

ASJC Scopus subject areas

  • 原子力エネルギーおよび原子力工学

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