Abstract
In the marine environment, sea wave affects the reactor coolant periodically through the additional forces. In this paper, a modified mathematical model is proposed and applied in the RELAP5/3.2 code in order to simulate the marine heaving condition. Then the influence mechanism of heaving motion and natural circulation features for an integral natural circulation reactor are analysed and discussed. The results show that the original flow distribution of prototype reactor is broken, however, the natural circulation is not interrupted. What’s more, the calculation shows that large amplitude and long period of heaving motion bring out violent oscillation, which is referential to the safety analysis of the reactor core.
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