ESPRIT试验验证RELAP5程序两相自然循环模拟能力

Validation of Analytical Capabilities of RELAP5 on Two-phase Nature Circulation by ESPRIT Tests

华龙一号核电厂中,在蒸汽发生器二次侧设置了非能动余热排出系统(PRS系统),可排出72 h内的堆芯剩余发热。为验证PRS系统能力,建立了三代核电非能动余热排出演示试验装置(ESPRIT)。该装置与华龙一号核电厂PRS系统高度比为1:1。开展了稳态运行和瞬态工况模拟试验,本文利用建立的RELAP5程序模型模拟了试验过程。与试验结果的比较显示RELAP5程序模拟两相自然循环现象的能力较好,但模拟蒸汽直接接触凝结的能力略有不足。

Secondary passive system (PRS) is designed to remove the residual heat during 72 hours after the reactor trips in a 3rd generation reactor called Hualong I. To verify the ability of PRS system, the test facility ESPRIT is built and the height ratio is 1:1. Tests are consisted by three steady-states and two transients. One model of RELAP5 is developed and used to simulate the steady and transient tests. The results of RELAP5 is consistent with facility results, but underestimates the direct-contact condensation power. © 2015, Editorial Office of Nuclear Power Engineering. All right reserved.