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Analysis of Fukushima-Daiichi Nuclear Power Plant Unit 3 pressure data and obtained insights on accident progression behavior
- Source :
- Nuclear Engineering and Design. 383:111426
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The D/W (Drywell) and S/C (Suppression Chamber) pressure data of Fukushima-Daiichi Nuclear Power Plant Unit 3 was analyzed in depth. This analysis provided valuable information related to the accident progression behavior on one hand, and gave a hint for understanding of the debris-to-coolant heat transfer when fuel debris relocated to the pedestal on the other hand. In this unit, the D/W and S/C pressure increased and decreased cyclically with a relationship, which seems to have been dependent on the composition of vapor and non-condensable gases in the S/C cover gas region. Based on this characteristic, the vapor pressure in the S/C cover gas region was evaluated for two pressure decrease cycles during and after the expected debris relocation to the pedestal respectively. This evaluation allowed an understanding that the S/C vapor pressure increased due to the heat transfer from the debris relocated to the pedestal. With this understanding, several possible S/C vapor pressure histories were assumed. Based on this parametric study it was suggested that some part of the S/C water was heated up within about 75 min when the main part of the fuel debris would have been relocating to the pedestal.
- Subjects :
- Nuclear and High Energy Physics
Vapor pressure
Mechanical Engineering
Pressure data
Mechanics
Debris
law.invention
Pedestal
Fukushima daiichi
Nuclear Energy and Engineering
law
Nuclear power plant
Heat transfer
Pressure decrease
Environmental science
General Materials Science
Safety, Risk, Reliability and Quality
Waste Management and Disposal
Subjects
Details
- ISSN :
- 00295493
- Volume :
- 383
- Database :
- OpenAIRE
- Journal :
- Nuclear Engineering and Design
- Accession number :
- edsair.doi...........f657685ae5b624db22aaff9ee4d4b895