Abstract
In accidents when the water level of the reactor core descends below the top of the active fuel, the cooling limit height is a key factor in determining the accident mitigation procedure and the boiling two-phase flow in a fuel-rod bundle exhibits multi-dimensional and complex flow structures during such boil-off process. A rod bundle boil-off experiment was conducted to determine the three-dimensional void-fraction distribution and axial profile of the rod-surface temperature during the boil-off process under atmospheric pressure conditions. The 5×5 rod bundle, featuring a heated length of 2 m, had an axially and radially uniform power profile, with eight pairs of sheath thermocouples embedded on the heated rod to monitor its surface temperature distribution. The void-fraction distribution was acquired with five pairs of SubChannel Void Sensor (SCVS) as time-series data. The experimental results showed the relationship between an effective cooling level and boiling two-phase flow dynamics in the rod bundle.
| Original language | English |
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| Publication status | Published - 2015 Jan 1 |
| Externally published | Yes |
| Event | 23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015 - Chiba, Japan Duration: 2015 May 17 → 2015 May 21 |
Conference
| Conference | 23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015 |
|---|---|
| Country/Territory | Japan |
| City | Chiba |
| Period | 15/5/17 → 15/5/21 |
Keywords
- 5×5 heated rod bundle
- Boil-off
- Boiling two-phase flow
- Subchannel void sensor
- Two-phase mixture level
- Void fraction
ASJC Scopus subject areas
- Nuclear Energy and Engineering