Low cycle fatigue - strain control test data for P91 - sj material at 550 °C (specimen identifier S29-SAG3)

The 2010-2012 implementation plan of the European Sustainable Nuclear Industrial Initiative (ESNII), in the frame of the Sustainable Nuclear Energy Technology Platform (SNE TP), establishes a very tight time schedule for the start of construction of the European Gen IV prototypes; namely the construction of the LFR ETPP (European Technology Pilot Plant) Myrrha will start in 2014 and that of the SFR Prototype ASTRID will start in 2017. The GEN IV reactors pose new challenges to the designers and scientists in terms of higher operating temperature and higher irradiation damage of materials with respect to the present technologies. In this frame, the MATTER (MATerials TEsting and Rules) Project intends to start well targeted researches to perform careful studies of materials behaviors in GEN IV operational conditions and to find out criteria for the correct use of these materials in relevant reactor applications. The design and assessment of welds is very important for the Design of nuclear components and hence of the Design Rules. The weld joint is one major weak zone of the structures and it should be introduced in the design rules to reduce the weld loading conditions. According to the statements above, the LEI has carried out Low Cycle Fatigue tests on single P91 metal specimen and P91 specimens with cross-section weld joint. The activities were carried out in the frame of the MATTER project (Grant agreement no: 269706).