TY - GEN
T1 - Estimation of long-term ex-vessel debris cooling by water in fukushima Daiichi nuclear power plant unit-3
AU - Sato, Ikken
AU - Yamaji, Akifumi
AU - Li, Xin
AU - Madokoro, Hiroshi
N1 - Publisher Copyright:
© 2021 by ASME.
PY - 2021
Y1 - 2021
N2 - Interpretation for the two-week long Unit 3 ex-vessel debris cooling behavior was conducted based on 1F plant and 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, both in-vessel and ex-vessel ones, 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, in-vessel and ex-vessel debris were heat up and it took another four days to re-flood the heated up debris.
AB - Interpretation for the two-week long Unit 3 ex-vessel debris cooling behavior was conducted based on 1F plant and 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, both in-vessel and ex-vessel ones, 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, in-vessel and ex-vessel debris were heat up and it took another four days to re-flood the heated up debris.
KW - Decommissioning
KW - Dryout
KW - Ex-vessel debris
KW - Fukushima Daiichi Nuclear Power Plant
KW - Re-flooding
KW - Severe accident
KW - Unit 3
UR - http://www.scopus.com/inward/record.url?scp=85114194432&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85114194432&partnerID=8YFLogxK
U2 - 10.1115/ICONE28-64246
DO - 10.1115/ICONE28-64246
M3 - Conference contribution
AN - SCOPUS:85114194432
SN - 9784888982566
T3 - International Conference on Nuclear Engineering, Proceedings, ICONE
BT - Computational Fluid Dynamics (CFD); Verification and Validation; Advanced Methods of Manufacturing (AMM) for Nuclear Reactors and Components; Decontamination, Decommissioning, and Radioactive Waste Management; Beyond Design Basis and Nuclear Safety; Risk Informed Management and Regulation
PB - American Society of Mechanical Engineers (ASME)
T2 - 2021 28th International Conference on Nuclear Engineering, ICONE 2021
Y2 - 4 August 2021 through 6 August 2021
ER -