influence of steel properties on the progression of a severe accident measurement of 304l and 16mnd5 steel density and surface tension
| Autor: | Chikhi, N., Fouquart, P., Jules Delacroix, Piluso, P. |
|---|---|
| Přispěvatelé: | amplexor, amplexor, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] focusing effect [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] surface tension [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] in-vessel retention steel and stainless steel properties Severe accident |
| Zdroj: | The 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17) The 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17), Sep 2017, Xi'An, China Scopus-Elsevier |
| Popis: | International audience; The In-Vessel Retention is an attractive strategy to mitigate a severe accident. Nevertheless, due to low margins, it remains questionable for reactors of power 1000MWe and higher. The success of the IVR strategy mainly depends on the inner thermal load, i.e. the heat flux transferred by the molten pool to the vessel, which has to remain lower than the Critical Heat Flux. In some configuration, the stratification of the molten pool may lead to the heat flux concentration in the thermal conductive metallic layer. The understanding of the metal layer behavior is fundamental in order to estimate the inner thermal load. It requires the liquid metal physical properties, such as density and surface tension. In the present paper, original data of the vessel thermophysical properties are proposed for the first time. Measurements of 304L and 16MND5 steel density and surface tension have been made using the sessile drop method. Samples have been melt to form a drop on an yttria-stabilized zirconia substrate and heated up to 200DC above the melting point. The Low Bond Axisymmetric Drop Shape Analysis has been used to estimate the sample density and surface tension and to propose correlations for the density and surface tension as a function of the temperature. The influence of steel properties on the metal layer cooling has been discussed. Especially, the sign of metal temperature surface tension coefficient det963;/dT was found to be most likely positive. In this case, the Benard-Marangoni flow is opposite to the Rayleigh-Benard convection flow, limiting the global cooling. |
| Databáze: | OpenAIRE |
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