Estimation of debris relocation and structure interaction in the pedestal of Fukushima Daiichi Nuclear Power Plant Unit-3 with Moving Particle Semi-implicit (MPS) method

Xin Li*, Akifumi Yamaji, Guangtao Duan, Ikken Sato, Masahiro Furuya, Hiroshi Madokoro, Yuji Ohishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

To provide supportive information to understand the current debris status in Fukushima Daiichi Nuclear Power Plant (NPP) Unit-3 (from hereinafter, Unit-3), the meshless, Lagrangian Moving Particle Semi-implicit (MPS) method has been developed for the evaluation of debris-structure interactions in the pedestal region of Unit-3. The developed MPS method incorporated approaches to enhance numerical accuracy and stability, such as second-order corrective matrix and particle shifting technique, and the calculation cost reduction and efficiency improvement strategies to enable plant-scale simulations. A 1/10 scale numerical model of the pedestal region and structures within of Unit-3 and sensitivity analysis conditions were established for simulation cases. The simulation results showed that the convective vapor cooling from the debris surface in the pedestal region and the debris relocation amount/the time intervals between the relocations play important roles in the structure damage due to thermal attacks from the debris.

Original languageEnglish
Article number108923
JournalAnnals of Nuclear Energy
Volume169
DOIs
Publication statusPublished - 2022 May

Keywords

  • Decommissioning of Fukushima Daiichi (1F) reactors
  • MPS method
  • Numerical simulation
  • Severe accident

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

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