Molten Core - Concrete Interactions in Nuclear Accidents: Theory and Design of an Experimental Facility

    Research output: Book/ReportReport

    3 Citations (Scopus)

    Abstract

    In a hypothetical severe accident in a nuclear power plant, the molten core of the reactor may flow onto the concrete floor of containment building. This would cause a molten core - concrete interaction (MCCI), in which the heat transfer from the hot melt to the concrete would cause melting of the concrete. In assessing the safety of nuclear reactors, it is important to know the consequences of such an interaction. As background to the subject, this publication includes a description of the core melt stabilization concept of the European Pressurized water Reactor (EPR), which is being built in Olkiluoto in Finland. The publication includes a description of the basic theory of the interaction and the process of spalling or cracking of concrete when it is heated rapidly. A literature survey and some calculations of the physical properties of concrete and corium-concrete mixtures at high temperatures have been conducted. In addition, an equation is derived for conservative calculation of the maximum possible concrete ablation depth. The publication also includes a literature survey of experimental research on the subject of the MCCI and discussion of the results and deficiencies of the experiments. The main result of this work is the general design of an experimental facility to examine the interaction of molten metals and concrete. The main objective of the experiments is to assess the probability of spalling, or cracking, of concrete under pouring of molten material. A program of five experiments has been designed, and pre-test calculations of the experiments have been conducted with MELCOR 1.8.5 accident analysis program and conservative analytic calculations.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages88
    ISBN (Electronic)951-38-6744-7
    ISBN (Print)951-38-6743-9
    Publication statusPublished - 2005
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Tiedotteita - Meddelanden - Research Notes
    Number2311
    ISSN1235-0605

    Fingerprint

    Molten materials
    Accidents
    Concretes
    Spalling
    Experiments
    Concrete mixtures
    Pressurized water reactors
    Nuclear reactors
    Ablation
    Liquid metals
    Concrete construction
    Nuclear power plants
    Melting
    Stabilization
    Physical properties
    Heat transfer

    Keywords

    • nuclear power plants
    • nuclear safety
    • reactor core
    • meltdown
    • concrete structures
    • containment buildings
    • spalling
    • cracking
    • simulation
    • MELCOR

    Cite this

    Sevón, T. (2005). Molten Core - Concrete Interactions in Nuclear Accidents: Theory and Design of an Experimental Facility. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, No. 2311
    Sevón, Tuomo. / Molten Core - Concrete Interactions in Nuclear Accidents : Theory and Design of an Experimental Facility. Espoo : VTT Technical Research Centre of Finland, 2005. 88 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2311).
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    abstract = "In a hypothetical severe accident in a nuclear power plant, the molten core of the reactor may flow onto the concrete floor of containment building. This would cause a molten core - concrete interaction (MCCI), in which the heat transfer from the hot melt to the concrete would cause melting of the concrete. In assessing the safety of nuclear reactors, it is important to know the consequences of such an interaction. As background to the subject, this publication includes a description of the core melt stabilization concept of the European Pressurized water Reactor (EPR), which is being built in Olkiluoto in Finland. The publication includes a description of the basic theory of the interaction and the process of spalling or cracking of concrete when it is heated rapidly. A literature survey and some calculations of the physical properties of concrete and corium-concrete mixtures at high temperatures have been conducted. In addition, an equation is derived for conservative calculation of the maximum possible concrete ablation depth. The publication also includes a literature survey of experimental research on the subject of the MCCI and discussion of the results and deficiencies of the experiments. The main result of this work is the general design of an experimental facility to examine the interaction of molten metals and concrete. The main objective of the experiments is to assess the probability of spalling, or cracking, of concrete under pouring of molten material. A program of five experiments has been designed, and pre-test calculations of the experiments have been conducted with MELCOR 1.8.5 accident analysis program and conservative analytic calculations.",
    keywords = "nuclear power plants, nuclear safety, reactor core, meltdown, concrete structures, containment buildings, spalling, cracking, simulation, MELCOR",
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    Sevón, T 2005, Molten Core - Concrete Interactions in Nuclear Accidents: Theory and Design of an Experimental Facility. VTT Tiedotteita - Meddelanden - Research Notes, no. 2311, VTT Technical Research Centre of Finland, Espoo.

    Molten Core - Concrete Interactions in Nuclear Accidents : Theory and Design of an Experimental Facility. / Sevón, Tuomo.

    Espoo : VTT Technical Research Centre of Finland, 2005. 88 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2311).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Molten Core - Concrete Interactions in Nuclear Accidents

    T2 - Theory and Design of an Experimental Facility

    AU - Sevón, Tuomo

    N1 - Project code: 12S-SAAAN1MMCE

    PY - 2005

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    N2 - In a hypothetical severe accident in a nuclear power plant, the molten core of the reactor may flow onto the concrete floor of containment building. This would cause a molten core - concrete interaction (MCCI), in which the heat transfer from the hot melt to the concrete would cause melting of the concrete. In assessing the safety of nuclear reactors, it is important to know the consequences of such an interaction. As background to the subject, this publication includes a description of the core melt stabilization concept of the European Pressurized water Reactor (EPR), which is being built in Olkiluoto in Finland. The publication includes a description of the basic theory of the interaction and the process of spalling or cracking of concrete when it is heated rapidly. A literature survey and some calculations of the physical properties of concrete and corium-concrete mixtures at high temperatures have been conducted. In addition, an equation is derived for conservative calculation of the maximum possible concrete ablation depth. The publication also includes a literature survey of experimental research on the subject of the MCCI and discussion of the results and deficiencies of the experiments. The main result of this work is the general design of an experimental facility to examine the interaction of molten metals and concrete. The main objective of the experiments is to assess the probability of spalling, or cracking, of concrete under pouring of molten material. A program of five experiments has been designed, and pre-test calculations of the experiments have been conducted with MELCOR 1.8.5 accident analysis program and conservative analytic calculations.

    AB - In a hypothetical severe accident in a nuclear power plant, the molten core of the reactor may flow onto the concrete floor of containment building. This would cause a molten core - concrete interaction (MCCI), in which the heat transfer from the hot melt to the concrete would cause melting of the concrete. In assessing the safety of nuclear reactors, it is important to know the consequences of such an interaction. As background to the subject, this publication includes a description of the core melt stabilization concept of the European Pressurized water Reactor (EPR), which is being built in Olkiluoto in Finland. The publication includes a description of the basic theory of the interaction and the process of spalling or cracking of concrete when it is heated rapidly. A literature survey and some calculations of the physical properties of concrete and corium-concrete mixtures at high temperatures have been conducted. In addition, an equation is derived for conservative calculation of the maximum possible concrete ablation depth. The publication also includes a literature survey of experimental research on the subject of the MCCI and discussion of the results and deficiencies of the experiments. The main result of this work is the general design of an experimental facility to examine the interaction of molten metals and concrete. The main objective of the experiments is to assess the probability of spalling, or cracking, of concrete under pouring of molten material. A program of five experiments has been designed, and pre-test calculations of the experiments have been conducted with MELCOR 1.8.5 accident analysis program and conservative analytic calculations.

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    KW - concrete structures

    KW - containment buildings

    KW - spalling

    KW - cracking

    KW - simulation

    KW - MELCOR

    M3 - Report

    SN - 951-38-6743-9

    T3 - VTT Tiedotteita - Meddelanden - Research Notes

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    CY - Espoo

    ER -

    Sevón T. Molten Core - Concrete Interactions in Nuclear Accidents: Theory and Design of an Experimental Facility. Espoo: VTT Technical Research Centre of Finland, 2005. 88 p. (VTT Tiedotteita - Meddelanden - Research Notes; No. 2311).