The European Commission, DG XI, has published a call for tenders for a study on the design made from Mod9CrlMo steel under cyclic loading. The study mainly focuses on assessments related to creep and creep-fatigue properties of Mod9CrlMo weldments for recommendations to be used in codes and it will include the design evaluation of the cyclic softening properties of Mod9CrlMo steel and weld metals. The study should make design recommendations to be used in codes and high-temperature diagrams for fast reactors. Modified 9CrlMo steel has been developed for high-temperature steam generator components where its good corrosion resistance combined with good high-temperature properties can be used to advantage in steam generators of fast reactors (FRs). The study will collect and analyse fatigue and creep-fatigue properties for Mod9CrlMo weldments, and cyclic deformation data for both wrought steel and weldments in the operating temperature range of FR steam generators. Further, the existing industrial nuclear codes and standards are written round cyclically hardening materials such as stainless steels but they do not address cyclically softening materials and related methodology for assessing the evolution of cyclic stress-strain data. These questions will be analysed, in the study, through the implementation of benchmarks for assessing the application of present methodology enforced by codes and high-temperature diagrams. Requests (in writing) for tender documentation should be sent to: European Commission DG XI/A-2 Environment, Nuclear Safety and Civil Protection Mr V. Bhardwaj 200 rue de la Loi (BU5 3/158) B-1049 Brussels Tel. +32-2-2990889; Fax +32-2-2994449 Completed tenders should be sent to the same address.