Abstract:
On the basis of the reflooding experiment NEPTUN-LWHCR performed in Switzerland,this paper summarized the characteristics of the reflooding phase of tight lattice,and analyzed the reasons for the high peak clad temperature.A new heat transfer model of precursory cooling is established.It is proposed that the steam cooling is relatively poor in the precursory cooling to make the peak clad temperature higher.Through validating this mew model by calculating the peak clad temperature,it can be concluded that the new model is reasonable.