Abstract: The creep induced rupture of the reactor coolant system (RCS) may arise in severe accident, which may bypass the containment for creep induced steam generator tube rupture (SGTR) or depressurize the RCS quickly for creep induced hot leg or surge line break. Therefore, it is essential for severe accident analysis and especially for level 2 probabilistic safety analysis (PSA) to evaluate the probability of creep induced RCS rupture in severe accident. In this paper, the deterministic model for creep induced RCS rupture was constructed based on creep rupture model, considering steam generator tube flaws. On the basis of the deterministic model, the probabilistic program was developed to evaluate creep induced RCS rupture in severe accident using Latin hypercube sampling method to consider the uncertainties for important parameters. Then the probabilities of creep induced RCS rupture for representative accident sequences were assessed. It is concluded that there are certain probabilities for creep induced SGTR and high probabilities for creep induced hot leg or surge line failures for high pressure accident sequences.