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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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.",
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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

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AU - Sévon, Tuomo

PY - 2015

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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.

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KW - MELCOR

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