Size and radial origin of fragments formed while heating a 83 GWd/t$_U$ PWR fuel up to 1200 °C
| Autor: | Noirot, J., Blay, Th, Lamontagne, J., Fayette, L, Pontillon, Yves, Pujol, X |
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| Přispěvatelé: | NOIROT, Jean, Département d'Etudes des Combustibles (DEC), 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), Laboratoire de Modélisation Multi-échelles des Combustibles (LM2C), Service d'Etudes de Simulation du Comportement du combustibles (SESC), 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 d'Etudes des Combustibles (DEC), Laboratoire d'Analyse de la Migration des Radioéléments (LAMIR), Service d'Analyses, d'Elaboration, d'Expérientations et d'Examens des combustibles (SA3E) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | HRP / WGFS LOCA Workshop HRP / WGFS LOCA Workshop, May 2015, Aix-en-Provence, France |
| Popis: | International audience; When submitted to heating tests reaching 1200 °C, pellet long fuel samples generally exhibit crackingafter the test, nonetheless, the fuel keeps its original shape and most of the fragments remain insidethe cladding section [1].However, after having been submitted to a 1200 °C, 20 °C/s, heating test with a surrounding pressureclose to 0.1 MPa, in the Merarg LECA-STAR CEA device, a UO$_2$ section, with a local average burn-up of83 GWd/t$_U$, was found fragmented, with most of the fragments outside of the cladding and in thecrucible used for the test. These fragments exhibited a wide range of sizes.Detailed examinations on a sibling sample had been previously conducted. They are partly reportedin [2].Using these previous results as a reference for the fuel microstructure and composition along thepellet radius, a detailed examination of thirty three of these fragments was conducted using theEPMA. The purpose of these detailed examinations was to determine the radial origin of each one ofthese fragments and to evaluate whether there was, or not, a link between the size of thesefragments and their initial location within the pellet.The result of this study was that all the millimetric fragments visible on the polished surface of thesample came from areas that had shown, at the end of the irradiation, an especially low fission gasbubble formation rate, when compared to the rest of the pellet. On the contrary, very smallfragments formed in all areas where many fission gas bubbles had been seen at the surface of apolished cross section. |
| Databáze: | OpenAIRE |
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