Unsolved issues related to thermal-hydraulics in the suppression chamber during Fukushima Daiichi accident progressions

On 11 March 2011, the Great East Japan Earthquake and Tsunami hit the Fukushima Daiichi Nuclear Power Station. The Fukushima Daiichi Units 1-3 lost all DC and AC power supplies, which set in motion a chain of events that led to releases of radioactivity to the environment. Since then, TEPCO has made...

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Bibliographic Details
Published in:Journal of nuclear science and technology 2016-05, Vol.53 (5), p.630-638
Main Authors: Mizokami, Shinya, Yamada, Daichi, Honda, Takeshi, Yamauchi, Daisuke, Yamanaka, Yasunori
Format: Article
Language:English
Subjects:
Accidents
Chambers
Earthquakes
fukushima daiichi accident
great east japan earthquake
Nuclear accidents
Nuclear energy
Power supplies
Progressions
Radioactivity
severe accident
Simulation
suppression chamber
tsunami
Tsunamis
unsolved issues
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Summary:On 11 March 2011, the Great East Japan Earthquake and Tsunami hit the Fukushima Daiichi Nuclear Power Station. The Fukushima Daiichi Units 1-3 lost all DC and AC power supplies, which set in motion a chain of events that led to releases of radioactivity to the environment. Since then, TEPCO has made many efforts to investigate the accident progressions and the status of the reactors and containment vessels. However, there still exist several tens of unsolved issues to be investigated for the fully understanding of the accident. In this paper, we introduce the unsolved issues related to thermal-hydraulics in the suppression chamber during the Fukushima Daiichi accident progressions. Especially, in Units 2 and 3, there are possibilities that thermal stratification inside their suppression chambers played an important role. It is important that these phenomena are addressed following both theoretical and experimental approaches as support to severe accident simulations.
ISSN:0022-3131
1881-1248
DOI:10.1080/00223131.2015.1126540