Corrosion of structural materials with molten metal is one of major concerns of the feasibility of this concept. Many experimental works have been performed to examine the reactivity of eutectic Li17Pb83 with stainless-steel, and proved that the reactivity of it with structure materials is lower than that of the other molten breeders such as Li and LiF-BeF2. Several investigators have reported that weldments of Cr-Mo ferritic steel degradate with liquid LiPb because of the liquid metal induced embrittlement (LMIE) phenomena. Present study was aimed at the susceptibility of LMIE in the LiPb-steel system under various stress conditions. Tests were done with Li17Pb83 and pure Pb at 500degC. Test specimens of U-bend, tensiled-rod and weldments were prepared from austenitic (SUS316) and ferritic (modified 9Cr-1Mo) steels. At high stress condition of 70 % of break stress, generation of microcracks was observed. (author).