Characterization of high-temperature nuclear fuel-coolant interactions through X-ray visualization and image processing
| Autor: | Yuki Emura, Christophe Journeau, Ken-ichi Matsuba, Michael S. Johnson, Kenji Kamiyama |
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| Přispěvatelé: | Laboratoire d'Etudes et d'Expérimentation pour les Accidents Graves (LEAG), Service Mesures et modélisation des Transferts et des Accidents graves (SMTA), Département Technologie Nucléaire (DTN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département Technologie Nucléaire (DTN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Japan Atomic Energy Agency |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
[PHYS]Physics [physics]
Materials science Nuclear fuel Astrophysics::High Energy Astrophysical Phenomena 020209 energy 02 engineering and technology Mechanics 01 natural sciences Debris Spectral line 010305 fluids & plasmas Coolant Nuclear Energy and Engineering Fragmentation (mass spectrometry) 0103 physical sciences Thermal Vaporization 0202 electrical engineering electronic engineering information engineering Jet quenching |
| Zdroj: | Annals of Nuclear Energy Annals of Nuclear Energy, Elsevier Masson, 2021, 151, pp.107881-. ⟨10.1016/j.anucene.2020.107881⟩ Annals of Nuclear Energy, 2021, 151, pp.107881-. ⟨10.1016/j.anucene.2020.107881⟩ |
| ISSN: | 0306-4549 |
| DOI: | 10.1016/j.anucene.2020.107881⟩ |
| Popis: | High-resolution X-ray imaging was employed at the JAEA MELT facility to visualize a kilogram-scale interaction between a jet of high temperature molten stainless steel and sodium, mimicking a sodium-cooled fast-neutron reactor in the aftermath of a core-disruptive accident. A novel software, SPECTRA, has been developed for the quantitative characterization of jet quenching and fragmentation. Tracking and 3D reconstruction of the melt phase traversing the imaging window enabled the detection of 72% of the debris mass recovered post-experiment. The rebounding of melt fragments confirmed a solid outer crust at the melt-coolant interface, while a thermal fragmentation event induced rapid vapor expansion. Jet fragmentation is best explained by the vaporization of coolant entrained within the melt jet generating an internal over-pressure sufficient for fragmentation of the crust. Thermal fragmentation produced missiles with velocities exceeding that of the jet, and a bimodal debris size distribution of coarse jet shells and finer fragments. |
| Databáze: | OpenAIRE |
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