Abstract: The severe accident induced by station blackout (SBO) could lead to a long-term and high pressure sequence with inappropriate mitigation and the risk of creep rupture of steam generator (SG) tubes, pressurizer surge line and hotleg would be significant due to natural circulation inside reactor coolant system. Based on the two-loop design of Qinshan Ⅱ NPP, together with a probabilistic creep rupture model, this paper performed detailed evaluation for risk of creep rupture of SG tubes without implementing the action of injection water into SG in severe accident management guide (SAMG) (SAG-1) following severe accident induced by SBO. Therefore, quantitative results of negative impact of severe accident induced by SBO are supported to TSC which is in charge of making the final decision for reference. It is concluded that the risk of creep rupture rises around 16 361 s since SBO. The risk of SG tube creep rupture is much lower than that of pressurizer surge line and hotleg after 16 610 s since SBO. The probability of containment bypass due to SG tube creep rupture is negligible during the severe accident induced by SBO for Qinshan Ⅱ NPP.