In this paper, the condensation-induced water-hammer analysis on the steam generator accident relief system is carried out. When accident occurs in the steam generator, the accident relief system is used. The high temperature and high pressure steam will flow into the cold water. In the juncture surface of steam and water, the steam will condense. At some condition, the condensation-induced water-hammer might occur and bring about enormous damage. This process is transient and of two-phase character. It is modeled by two-phase VOF mehtod, in which the steam condensation is considered on the juncture surface. The velocity and pressure in the pipeline are obtained through numerical simulation. The results can supply the theoretical basis for engineering design.
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