| Autor: |
Pinton, Eric, Duret, Bernard, Berthoud, Georges |
| Zdroj: |
Nuclear Technology; September 1999, Vol. 127 Issue: 3 p332-351, 20p |
| Abstrakt: |
AbstractTo improve the knowledge of the behavior of a UF6container during a fire, an experimental project called Tenerife was conducted by the Commissariat à l’Energie Atomique. Three tests with UF6with different kinds of heating and temperature furnaces were carried out. The main information obtained from monitoring temperature and pressure during the heating tests is as follows:1. The presence of a strong thermal contact resistance at the solid UF6-steel interface.2. The rupture of the solid crust at the top of the container, a crust formed during container cooling after filling, for a pressure reaching 1.5 bars (triple point). This leads to the beginning of boiling heat transfer and notably film boiling, followed by transition boiling and nucleate boiling.3. The appearance of the liquid stratification with the beginning of nucleate boiling. It can accelerate the rise in pressure because of the reduction of mass transfer by condensation to the liquid-gas interface. This stratification is preserved with the natural convection regime that replaces the nucleate boiling after the end of heating.4. After rupture of the upper UF6crust, the pressure increase may be delayed by different wetting of the UF6on the steel wall.Also, these tests were allowed to build and validate a scenario that has been reproduced in a numerical model. |
| Databáze: |
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