Abstract:
The structures simplified from the outside cooling of the passive containment cooling system（PCCS）, was numerically simulated, with the aim to study its effects on the residual heat removal during nuclear accidents. Characteristics of the PCCS outside cooling only with natural forces driving were obtained, based on which the coupled heat transfers among the downcomer channel, the baffle plate and the riser channel were discussed. Finally, the width of the downcomer channel on the PCCS outside cooling was analyzed, and it indicated that the downcomer channel should be considered for long vertical section.
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