压力容器外部冷却两相自然循环特性理论分析  

Theoretical analysis of the properties of the two-phase natural circulation of ERVC

作　　者：赵国志 曹欣荣 石兴伟 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2014年第4期437-444,498,共9页Journal of Harbin Engineering University

基　　金：核电厂严重事故安全审评关键技术研究合作资助项目(201301-WXHT-05-1)

摘　　要：针对严重事故下压水堆压力容器下封头外侧与绝热层内侧环形通道内两相自然循环流动问题,利用FORTRAN语言,编写了压水堆压力容器外部冷却(external reactor vessel cooling,ERVC)一维稳态自然循环分析程序。通过分析不同摩擦系数的计算公式对两相自然循环质量流量和空泡份额计算的影响,与中国开展的REPEC(reactor pressure vessel external cooling)实验及RELAP5模拟结果对比,验证了程序的可行性。对ERVC系统重要的热工水力和结构参数进行了敏感性分析,得到结论:进口过冷度对ERVC系统内两相流量影响很大,当过冷度接近饱和值时,流量会出现峰值,进口面积、间隙宽度和水淹高度会影响质量流量峰值的大小;当过冷度高于峰值对应的过冷度,流量随过冷度增大而减小,反之随过冷度增大而增大。结果可为ERVC系统的设计和运行参数的评估提供了一种简便快速的方法。Focusing on the problem of two-phase natural circulation flow inside the loop-shape passage between the outside of the lower head of the reactor vessel and the inside of the insulator in times of severe accidents, an analy-sis program for one-dimensional steady-state natural circulation under the external reactor vessel cooling （ ERVC ） condition was done by utilizing the FORTRAN language. The effects of the calculation formulae of different friction coefficients on mass flow and void fraction of the two-phase natural circulation flow were studied. The results were compared with those obtained in the Chinese REPEC （ reactor pressure vessel external cooling） experiment and the RELAP5 simulation, and the feasibility of the program was demonstrated. A sensitivity analysis was performed for the important thermal-hydraulic and configuration parameters of the ERVC system, and the following conclusion was obtained：The inlet subcooling has a significant impact on the two-phase flow in the ERVC system. When the sub-cooling becomes close to the saturated value, the flow will reach the peak value. The inlet area, gap width and flooding height will influence the flow peak value of the quality flow. When the subcooling is higher than the sub-cooling corresponding to the flow peak, the flow will decrease following the increase of the subcooling, and contrari-wise, the flow increases as subcooling increases. These results may provide a simple and convenient method for as-sessing the design and operation parameters of the ERVC system.

关 键 词：两相自然流动 一维稳态 质量流量 空泡份额 过冷度 

分 类 号：TL364.4[核科学技术—核技术及应用]