Abstract
The qualification of metallic materials for advanced HTR applications is based on creep behaviour, fatigue properties, structural stability and corrosion resistance. A brief state of the art is provided for the materials for heat exchanging components. Of specific interest are the possible effects of helium on the mechanical properties. Helium, which serves as primary coolant, contains traces of reactive impurities such as hydrogen, methane, carbon monoxide and water vapor. Alloy improvement and the progress in development of new alloys are reviewed. In addition, the influence of neutron irradiation on the hot tensile and creep properties of absorber rod materials are investigated. The evaluation of the HTR materials programme provide the basis for structural design rules of components with operation temperatures above 800°C.
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