Steam condensation plays a key role in removing heat from the containment atmosphere, therefore the calculation of the steam condensation has a significant effect on the judgment of severe accident process. This paper discussed the calculation models of condensation used in severe accident integral codes.

Firstly two kinds of condensation calculation models introduced and analyzed for application in integral codes: models based on experiment correlations — Uchida model, Dehbi model, and the models based on analogy of heat-mass transfer — Kreith model and Collier model. And then two calculation models based on Kreith model were proposed: simplified calculation model and completely iterative calculation model.

After that, a heat structure calculation code was designed and the two model was applied. The results of the code with the two model along with Uchida and Dehbi models were compared with the experiment result of Wisconsin. It was found that the simplified model had a satisfied calculation speed and the relative errors were under 13% in total situations, which was acceptable for the integral code. Besides, it was shown that the completely iterative calculation model had smaller relative errors, which was under 11%. In addition, this paper also investigated the effects of some parameters on the heat transfer coefficient for these different models, the velocity of the bulk of gas, length of surface, pressure of the gas and mole fraction of air were selected and studied separately.

This content is only available via PDF.
You do not currently have access to this content.