Experimental Study on Natural Circulation Characteristics of Passive Residual Heat Removal System

Experiments on the natural circulation performance of the secondary passive residual heat removal system（PRS） for Hua Long Yi Hao have been performed by using the high temperature high pressure thermal-hydraulic test facility ESPRIT（Emergency Secondary Passive Residual Heat Removal System Integral Test Facility）. The experimental results show that the heat transfer of PRS and the condensation heat exchanger meet the design parameters of 0.5%FP. The result also shows that the core heat can be sufficiently removed during 72 h after shutdown in station black-out（SBO） accident.