Estimation of long-term ex-vessel debris cooling behavior in Fukushima Daiichi Nuclear Power Plant unit 3

Interpretation for the two-week long Unit 3 ex-vessel debris cooling behavior was conducted based on the Fukushima-Daiichi Nuclear Power Plant (1F) data and the site data such as pressure, temperature, gamma ray level and live camera pictures. It was estimated that the debris relocated to the pedest...

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Bibliographic Details
Published inMechanical Engineering Journal Vol. 9; no. 2; p. 21-00436
Main Authors SATO, Ikken, YAMAJI, Akifumi, LI, Xin, MADOKORO, Hiroshi
Format Journal Article
LanguageEnglish
Published The Japan Society of Mechanical Engineers 01.01.2022
Subjects
Decommissioning
Dryout
Ex-vessel debris
Fukushima Daiichi Nuclear Power Plant (1F)
Re-flooding
Severe accident
Unit 3
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Summary:Interpretation for the two-week long Unit 3 ex-vessel debris cooling behavior was conducted based on the Fukushima-Daiichi Nuclear Power Plant (1F) data and the site data such as pressure, temperature, gamma ray level and live camera pictures. It was estimated that the debris relocated to the pedestal was in partial contact with liquid water for about initial two days. With the reduction of the sea water injection flowrate, the debris, existed mainly in the pedestal region, became “dry”, in which the debris was only weakly cooled by vapor and this condition lasted for about four days until the increase of the sea water injection. During this dry period, the pedestal debris was heated up and it took further days to re-flood the heated up debris.
ISSN:2187-9745
2187-9745
DOI:10.1299/mej.21-00436