Low cycle fatigue - strain control test data for P91 - sj material at 550 °C (specimen identifier S32-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).

在可持续核能技术平台（Sustainable Nuclear Energy Technology Platform, SNE TP）框架下，《欧洲可持续核工业倡议（European Sustainable Nuclear Industrial Initiative, ESNII）2010-2012年实施计划》为欧洲第四代（Gen IV）原型堆的开工制定了极为严苛的时间节点：铅冷快堆欧洲技术试验工厂（LFR ETPP，全称European Technology Pilot Plant）米尔哈（Myrrha）将于2014年启动建设，钠冷快堆原型堆ASTRID则将于2017年开工。相较于当前的核电技术，第四代反应堆具有更高的运行温度与更显著的材料辐照损伤，这给设计者与科研人员带来了全新的挑战。在此背景下，材料测试与规范（MATerials TEsting and Rules, MATTER）项目旨在开展针对性研究，对第四代反应堆运行工况下的材料行为进行细致探究，并确立相关反应堆应用中材料的正确使用准则。焊缝的设计与评估对于核部件乃至核设计规范的制定均至关重要：焊接接头是核结构的主要薄弱区域之一，因此应将其纳入设计规范以优化焊缝的载荷承受条件。基于上述背景，LEI已针对单根P91金属试样以及带截面焊接接头的P91试样开展了低周疲劳（Low Cycle Fatigue）试验。本次试验活动在材料测试与规范（MATTER）项目框架下开展（资助协议编号：269706）。