Reproducible fabrication, workability and weldability: the material s have to be machined, rolled or bent but also welded Heat resistance: limited decrease of strength and toughness with temperature Dimensional stability: resistance to irradiation induced swelling and creep Mechanical resistance: sufficient strenght with limited loss of ductility and fracture toughness under irradiation in liquid metal, and acceptable He-embrittlement Corrosion resistance: very limited dissolution and intergranular attack by Pb-Bi Compatibility with Pb-Bi: good embrittlement resistance under the synergetic effects of irradiation and liquid metal flow.
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