Abstract
The accident progression and melt behavior at the Fukushima Daiichi Units 1 and 2 were investigated using MELCOR 2.1. In the modeling the lower head failure mechanism by penetration tube rupture and ejection was modeled. In the modeling of Unit 2, according to the latest findings by TEPCO investigation, the possibilities of torus room flooding, RCIC piping leakage and thermal stratification in suppression pool were taken into account. The analysis results indicate that for Unit 1 when considering penetration tube failure, a part of debris still remained in the lower head after debris discharge; otherwise all the debris discharged out. The present MELCOR modeling of Unit 2 well reproduced the RPV and PCV pressure. A part of the core was damaged and the debris that slumped into the lower head was sufficiently cooled down. The pressure vessel kept intact.
Original language | English |
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Title of host publication | Thermal-Hydraulics |
Publisher | American Society of Mechanical Engineers (ASME) |
Volume | 6 |
ISBN (Print) | 9784888982566 |
DOIs | |
Publication status | Published - 2017 |
Event | 2017 25th International Conference on Nuclear Engineering, ICONE 2017 - Shanghai, China Duration: 2017 Jul 2 → 2017 Jul 6 |
Other
Other | 2017 25th International Conference on Nuclear Engineering, ICONE 2017 |
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Country | China |
City | Shanghai |
Period | 17/7/2 → 17/7/6 |
ASJC Scopus subject areas
- Nuclear Energy and Engineering