A MELCOR model of Fukushima Daiichi Unit 1 accident

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    Abstract

    A MELCOR model of Fukushima Daiichi Unit 1 accident was developed. The model is based on publicly available information, and the MELCOR input file is published as Electronic Supplementary data with this paper. In order to reproduce the measured containment pressure, it was necessary to model a leak from the reactor coolant system. Recirculation pump seal leak, starting 5 h after the earthquake, was assumed in this study. The reactor pressure vessel lower head was calculated to fail, and all fuel was discharged to the containment. Almost all of the radioactive noble gases and about 0.05% of the cesium inventory were released to the environment, according to this calculation. Calculated release rates from Units 1, 2, and 3 were compared with measured radiation dose rate in the plant area.
    Original languageEnglish
    Pages (from-to)1-11
    JournalAnnals of Nuclear Energy
    Volume85
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Accidents
    Cesium
    Inert gases
    Pressure vessels
    Coolants
    Dosimetry
    Seals
    Earthquakes
    Pumps

    Keywords

    • Fukushima accident
    • MELCOR
    • severe accident

    Cite this

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    title = "A MELCOR model of Fukushima Daiichi Unit 1 accident",
    abstract = "A MELCOR model of Fukushima Daiichi Unit 1 accident was developed. The model is based on publicly available information, and the MELCOR input file is published as Electronic Supplementary data with this paper. In order to reproduce the measured containment pressure, it was necessary to model a leak from the reactor coolant system. Recirculation pump seal leak, starting 5 h after the earthquake, was assumed in this study. The reactor pressure vessel lower head was calculated to fail, and all fuel was discharged to the containment. Almost all of the radioactive noble gases and about 0.05{\%} of the cesium inventory were released to the environment, according to this calculation. Calculated release rates from Units 1, 2, and 3 were compared with measured radiation dose rate in the plant area.",
    keywords = "Fukushima accident, MELCOR, severe accident",
    author = "Tuomo S{\'e}von",
    year = "2015",
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    language = "English",
    volume = "85",
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    issn = "0306-4549",
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    A MELCOR model of Fukushima Daiichi Unit 1 accident. / Sévon, Tuomo.

    In: Annals of Nuclear Energy, Vol. 85, 2015, p. 1-11.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - A MELCOR model of Fukushima Daiichi Unit 1 accident

    AU - Sévon, Tuomo

    PY - 2015

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    N2 - A MELCOR model of Fukushima Daiichi Unit 1 accident was developed. The model is based on publicly available information, and the MELCOR input file is published as Electronic Supplementary data with this paper. In order to reproduce the measured containment pressure, it was necessary to model a leak from the reactor coolant system. Recirculation pump seal leak, starting 5 h after the earthquake, was assumed in this study. The reactor pressure vessel lower head was calculated to fail, and all fuel was discharged to the containment. Almost all of the radioactive noble gases and about 0.05% of the cesium inventory were released to the environment, according to this calculation. Calculated release rates from Units 1, 2, and 3 were compared with measured radiation dose rate in the plant area.

    AB - A MELCOR model of Fukushima Daiichi Unit 1 accident was developed. The model is based on publicly available information, and the MELCOR input file is published as Electronic Supplementary data with this paper. In order to reproduce the measured containment pressure, it was necessary to model a leak from the reactor coolant system. Recirculation pump seal leak, starting 5 h after the earthquake, was assumed in this study. The reactor pressure vessel lower head was calculated to fail, and all fuel was discharged to the containment. Almost all of the radioactive noble gases and about 0.05% of the cesium inventory were released to the environment, according to this calculation. Calculated release rates from Units 1, 2, and 3 were compared with measured radiation dose rate in the plant area.

    KW - Fukushima accident

    KW - MELCOR

    KW - severe accident

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