CAST3M modelling of a spent fuel assembly bending during a handling accident Rod failure risk evaluation from the experimental results of spent fuel rod bending test
| Autor: | Philippe Mongabure, Caroline Guerin, P. Bouffioux, Thomas Laporte, C. Vaille, C. Cappelaere, Alain Miquet |
|---|---|
| Přispěvatelé: | Laboratoire de Mécanique Systèmes et Simulation (LM2S), Service d'Etudes Mécaniques et Thermiques (SEMT), Département de Modélisation des Systèmes et Structures (DM2S), 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)-Université Paris-Saclay-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)-Université Paris-Saclay-Département de Modélisation des Systèmes et Structures (DM2S), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Etudes de Mécanique Sismique (EMSI) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
0209 industrial biotechnology
Engineering business.industry Mechanical Engineering Nozzle Constitutive equation Stiffness 02 engineering and technology Bending Structural engineering Curvature Industrial and Manufacturing Engineering Spent nuclear fuel Cracking [SPI]Engineering Sciences [physics] 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering medicine General Materials Science medicine.symptom business Beam (structure) |
| Zdroj: | Mechanics & Industry Mechanics & Industry, 2014, 15 (4), pp.301-305. ⟨10.1051/meca/2014031⟩ CFM 2013 CFM 2013, 2013, Bordeaux, France Mechanics & Industry, EDP Sciences, 2014, 15 (4), pp.301-305. ⟨10.1051/meca/2014031⟩ |
| ISSN: | 2257-7777 2257-7750 |
| Popis: | International audience; The fuel handling operating rules exclude any accidental risk. However in the framework of the PRECCI R&D project, the bending of a spent fuel assembly resulting from its locking during a translation displacement is taken into account. This enabled us to develop an approach based on experiments and calculations that allows us to simulate the behaviour of an assembly under such loading. This study was carried out in CEA laboratories with the funding and the technical support of EDF. A three points bending test on a spent fuel rod segment was performed at the Laboratory for Mechanical Behaviour of Irradiated Materials (LCMI). From the experimental strength-displacement curve, a maximum failure strain, a maximum failure curvature and an equivalent constitutive equation were determined. CAST3M modelling of the fuel rod taking into account the elasto-plastic behaviour of the clad and the cracking of the UO2 fuel pellets was verified by the experimental results. Consequently, the identification of the respective contributions of the clad and of the pellets to the rod global behaviour was made possible. A two dimensional assembly with beam elements was modelled with CAST3M. The properties of the beams modelling the different parts of the assembly (top and bottom nozzle, grids) were chosen and adjusted according to their materials (zirconium alloys, steel) in order to obtain stiffness, tensile and shear behaviour, sliding and holding functions close to the experimental ones. Assembly bending calculations were performed. In order to obtain a rod integrity estimator, their maximum calculated strains and curvatures as a function of the bending angles can be compared to the failure experimental ones. |
| Databáze: | OpenAIRE |
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