A numerical study of isotropic and anisotropic ablation in MCCI by MPS method

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Anisotropic and isotropic ablation in molten corium-concrete interaction (MCCI) phenomenon was studied with the Moving Particle Semi-implicit (MPS) method by carrying out numerical simulations of CCI-2 and 3 experiments. The interaction of the fully oxidized PWR core melts with specially-designed two-dimensional limestone and siliceous concrete test sections was analyzed, focusing on investigating the two-dimensional ablation behavior with both limestone and siliceous concrete. The phase transition of molten corium and concrete was modeled based on a phase transition model for mixture. Slag film model and crust dissolution models were incorporated in the current MPS code to simulate the effect of gas generation and crust dissolution phenomena in limestone concrete. The effects of gas generation and aggregates on the concrete ablation behavior were investigated by simulating different specially designed cases. The simulation results by MPS method reproduced the isotropic and anisotropic cavity ablation profile and the overall axial and lateral ablation rates agreed well with the experimental measures. The experimental and MPS results both indicate that the crust on the corium-concrete interface can play an important part in concrete ablation process. The simulation results by MPS method also provide evidence to support the theory that aggregates are part of the cause of anisotropic ablation profile in cavity with siliceous concrete because aggregates could delay the axial basemat ablation more significantly than the lateral one and influence the power split in the melt pool.

    Original languageEnglish
    Pages (from-to)46-57
    Number of pages12
    JournalProgress in Nuclear Energy
    Volume90
    DOIs
    Publication statusPublished - 2016 Jul 1

    Fingerprint

    Ablation
    ablation
    Molten materials
    Concretes
    Limestone
    limestone
    crust
    phase transition
    cavity
    Dissolution
    Phase transitions
    dissolution
    melt
    simulation
    Concrete aggregates
    method
    particle
    slag
    Gases
    gas

    Keywords

    • Aggregates
    • Anisotropic ablation
    • Crust
    • Isotropic ablation
    • MCCI
    • MPS method

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Nuclear Energy and Engineering
    • Waste Management and Disposal
    • Safety, Risk, Reliability and Quality

    Cite this

    A numerical study of isotropic and anisotropic ablation in MCCI by MPS method. / Li, Xin; Yamaji, Akifumi.

    In: Progress in Nuclear Energy, Vol. 90, 01.07.2016, p. 46-57.

    Research output: Contribution to journalArticle

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