Centrum výzkumu Řež will carry out fatigue and fracture toughness tests in the frame of project Research for Sustainable Energy, in support of the European effort for the development of the Lead-cooled Fast Reactor as one of possible cooling systems of the Generation IV primary circuits. In order to progress material development for the future nuclear systems, an insight into the material properties at cycle fatigue loading and fracture toughness of candidate materials in Heavy Liquid Metals is required. The testing equipment has greater demands on precise measurement by comparison with Constant Extension Rate Tensile test previously performed in Centrum výzkumu Řež. Thus an extensometer for the liquid metal environment was developed to improve the accuracy of the measured results. The approach to testing conditions was upgraded with pumping circulation loop and possibility for sampling of liquid medium during the pretreatment. The progress in solving an issue of precise measurement is summarized and the adjustments of testing equipment are presented and justified.Keywords: Heavy liquid metals, testing equipment, extensometer
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