RELAP程序用于PRS分析的适用性研究

以三代核电技术“华龙一号”二次侧非能动余热排出系统（PRS）为研究对象，对RELAP程序用于PRS分析的适用性进行论证。首先通过关键现象识别和程序功能梳理，定性说明RELAP程序相关数理模型能够满足PRS分析的需求；同时通过修改RELAP程序水平/竖直管内蒸汽冷凝相关换热模型并与PRS实验台架结果进行对比，定量评价相关模型的适用性。在上述工作基础上，使用RELAP程序分析全厂断电（SBO）工况下PRS投入运行的瞬态过程，结果表明PRS能够建立自然循环并有效排出热量；最后分析了PRS误投入瞬态工况，结果表明PRS误投入工况下反应堆是安全的，PRS的设计满足要求。 

Study on Applicability of RELAP Code in PRS Analysis

In this paper, the passive residual heat removal system (PRS) on secondary side of HPR1000 nuclear power plant is taken as the research object, and the suitability of applying RELAP code to PRS analysis is evaluated. Firstly, by identifying the key phenomena and sorting out program functions, it shows that RELAP code related mathematical model can meet the needs of PRS analysis. At the same time, the applicability of the model was quantitatively evaluated by modifying the heat transfer model of steam condensation in horizontal/vertical tubes in RELAP program and comparing with the results of PRS test bench. On the basis of the above work, the transient process of PRS operation under SBO condition is analyzed by using RELAP. The results show that PRS can establish natural circulation and effectively discharge heat. Finally, the transient condition of PRS misoperation is analyzed. The results show that the reactor is safe under the misoperation condition of PRS, and the design of PRS system meets the requirements.