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The present study is an attempt to provide a unified description of the failure not directly depending on the tested geometry. This effort aims at providing a better understanding of the link between several existing safety criteria relying on very different mechanical testing. | An attempt for a unified description of mechanical testing on Zircaloy-4 cladding subjected to simulated LOCA transient EPJ Nuclear Sci. Technol. 2 13 2016 Nuclear Sciences J. Desquines et al. published by EDP Sciences 2016 amp Technologies DOI 10.1051 epjn 2016009 Available online at http www.epj-n.org REGULAR ARTICLE An attempt for a unified description of mechanical testing on Zircaloy-4 cladding subjected to simulated LOCA transient Jean Desquines Doris Drouan Elodie Torres Séverine Guilbert and Pauline Lacote PSN-RES SEREX LE2M IRSN Bâtiment 327 BP 3 13115 Saint-Paul-Lez-Durance France Received 25 September 2015 Received in final form 20 January 2016 Accepted 28 January 2016 Published online 25 March 2016 Abstract. During a Loss Of Coolant Accident LOCA an important safety requirement is that the reflooding of the core by the emergency core cooling system should not lead to a complete rupture of the fuel rods. Several types of mechanical tests are usually performed in the industry to determine the degree of cladding embrittlement such as ring compression tests or four-point bending of rodlets. Many other tests can be found in the open literature. However there is presently no real intrinsic understanding of the failure conditions in these tests which would allow translation of the results from one kind of mechanical testing to another. The present study is an attempt to provide a unified description of the failure not directly depending on the tested geometry. This effort aims at providing a better understanding of the link between several existing safety criteria relying on very different mechanical testing. To achieve this objective the failure mechanisms of pre-oxidized and pre-hydrided cladding samples are characterized by comparing the behavior of two different mechanical tests Axial Tensile AT test and C -shaped Ring Compression Test CCT . The failure of samples in both cases can be described by usual linear elastic fracture mechanics theory. Using .
