HECLA experiments on interaction between metallic melt and hematite-containing concrete

Tuomo Sevón (Corresponding Author), Tuomo Kinnunen, Jouko Virta, Stefan Holmström, Tommi Kekki, Ilona Lindholm

    Research output: Contribution to journalArticleScientificpeer-review

    31 Citations (Scopus)


    In a hypothetical severe accident in a nuclear power plant, molten materials may come into contact with concrete, causing concrete ablation. In five HECLA experiments the interaction between metallic melt and concrete was investigated by pouring molten stainless steel at almost 1800 °C into cylindrical concrete crucibles. The tests were transient, i.e. no decay heat simulation was used. The main objective was to test the behavior of the FeSi concrete, containing hematite (Fe2O3) and siliceous aggregates. This special concrete type is used as a sacrificial layer in the Olkiluoto 3 EPR reactor pit, and very scarce experimental data is available about its behavior at high temperatures.

    It is concluded that no clear differences between the ablation of FeSi concrete and ordinary siliceous concrete were observed. The ablation depths were small, 25 mm at maximum. No dramatic effects, such as cracking of large pieces of concrete due to the thermal shock, took place. An important side result of the test series was gaining knowledge of the properties of the special concrete type. Chemical analyses were conducted and mechanical properties were measured.
    Original languageEnglish
    Pages (from-to)3586-3593
    Number of pages8
    JournalNuclear Engineering and Design
    Issue number10
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed
    Event4th International Topical Meeting on High Temperature Reactor Technology - Washington, United States
    Duration: 21 Sept 20081 Oct 2008


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