Abstract
A hypothesized severe accident induced by LOCA with safety injection failure is investigated. The hydrogen generation rate and steam release rate are calculated by using the severe accident analysis program. Then, the three-dimensional computational fluid dynamics code GASFLOW is employed to simulate the two-dimensional flow field and the transport and distribution of hydrogen in the cabin. Based on the hydrogen behavior, a hydrogen control system, six NIS type PARs and three igniters, is proposed. The feasibility of the hydrogen control system is verified by comparing the volume fraction of hydrogen, flame acceleration factor and deflagration to detonation transition factor of each compartment when the hydrogen control system is started or not. The operation of hydrogen control system will lead to high temperature and high pressure, so measures should be taken to remove the heat in the marine nuclear reactor cabin.
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