A new method to study the transient feasibility of IVR-ERVC strategy

作者：Guo, Rui; Xu, Wei; Cao, Zhen; Liu, Xiaojing^*; Cheng, Xu

来源：Progress in Nuclear Energy, 2016, 87: 47-53.

DOI：10.1016/j.pnucene.2015.11.005

• IVR
• ERVC
• CHF
• Theoretical model
• Transient analysis

The traditional method to evaluate the feasibility of IVR-ERVC strategy is based on the steady state of the molten pool. But in the early stage, the transient behavior of the molten corium may impose a greater threat to the integrity of the reactor pressure vessel. A new method to study the transient feasibility is proposed in this paper. In order to calculate the critical heat flux in transient severe accident, a theoretical CHF model is developed suitable for the outer surface of the lower head. The effect of orientation on bubble movement is taken into consideration, and the method to deal with the non-uniform heat flux is also proposed. By comparing the prediction with the ULPU experimental data, the new model shows satisfying accuracy. Parametric analysis of the new model shows that an increased reactor pressure vessel diameter will lead to a decrease in critical heat flux at the lower head outer surface when the structure of the external flow channel keeps unchanged. A transient severe accident analysis of the large scale PWR shows that the transient behavior of the molten corium imposes a greater threat to the integrity of the reactor pressure vessel.

• 出版日期2016-3
• 单位上海交通大学