用于钠冷快堆系统分析软件中堆芯冷却剂通道堵流导致钠沸腾模型的开发

发布时间：2018-03-13 20:25

本文选题：钠冷快堆　切入点：系统分析软件　出处：《华北电力大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着全球化经济的迅速发展,化石能源的加速消耗及其带来的环境问题日益加剧,核能以其安全、经济、高效且可短期内大规模利用并替代传统化石能源的优势,在世界范围内广泛被利用。钠冷快堆是我国核能发展“三步走”战略中的第二步,能够解决目前压水堆发展中存在的铀资源利用率低和长寿命高放废物对环境威胁问题,可进一步提升核电在清洁能源中的竞争力。堵流导致钠沸腾问题是堆芯熔化事故的起始序列之一,也是钠冷快堆设计及其安全分析工作中必须要考虑的一个问题。本文主要任务是在钠冷快堆系统分析软件中,开发堆芯冷却剂通道堵流导致的钠沸腾模型,以填补我国钠冷快堆系统分析软件中没有钠沸腾模型的不足。程序计算结果表明：首先由于钠冷却剂气液两相密度差达数千倍乃至万倍,因而在入口冷却剂流量逐渐减少,其温度逐渐上升,达到沸腾的瞬间,少量相变就会引起通道内出现较大的空泡份额；其次由于钠冷却剂为液态金属冷却剂,其导热特性优良,包壳和冷却剂温差较小,只有几K左右,因而冷却剂通道内沸腾起始位置一般发生冷却剂通道出口处,随着入口流量的减少,该位置逐渐降低。文章最后运用商用CFD软件对程序计算结果进行对比验证,两者结果十分吻合,表明模型开发的合理性。
[Abstract]:With the rapid development of global economy, the accelerated consumption of fossil energy and its environmental problems are becoming more and more serious. Nuclear energy has the advantages of safety, economy, efficiency and short-term large-scale utilization and replacement of traditional fossil energy. Sodium cold fast reactor is the second step in the "three step" strategy of nuclear energy development in China, which can solve the problem of low utilization of uranium resource and long life high radioactive waste in the development of pressurized water reactor (PWR). It can further enhance the competitiveness of nuclear power in clean energy. The problem of sodium boiling caused by blocking flow is one of the starting sequences of core melting accident, and it is also a problem that must be considered in the design and safety analysis of sodium cooled fast reactor. The main task of this paper is in the system analysis software of sodium cooled fast reactor. The sodium boiling model caused by core coolant channel blockage is developed to fill the shortage of sodium boiling model in the system analysis software of sodium cooled fast reactor in China. The program results show that, first of all, because the density difference of gas-liquid two-phase of sodium coolant reaches several thousand or ten thousand times, the flow rate of the inlet coolant decreases gradually, and the temperature rises gradually, reaching the moment of boiling. A small amount of phase change will lead to a large amount of cavitation in the channel. Secondly, because the sodium coolant is a liquid metal coolant, its thermal conductivity is good, and the temperature difference between the cladding and the coolant is small, which is only a few K or so. Therefore, the starting position of boiling in the coolant channel generally occurs at the outlet of the coolant channel. With the decrease of the inlet flow rate, the position decreases gradually. Finally, commercial CFD software is used to verify the calculation results of the program. The results are in good agreement with each other, which indicates the rationality of the model development.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TL364.4

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