为核心扰动事故中形成的大气泡开发源期迁移模型

IF 3.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL
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引用次数: 0

摘要

由于钠冷快堆在设计时考虑到了较高的固有安全性,因此发生堆芯破坏性事故(CDA)的概率极低。然而,从深度防御的角度来看,为确保反应堆的安全性和可靠性,对 CDA 序列的研究仍然是值得的。在 CDA 期间,钠池内的大气泡迅速膨胀,从堆芯上升并覆盖气体区,为源项(安全壳屏障内的放射性物质)提供了潜在的迁移路径。最初在几百毫秒后在覆盖气体区域内释放的源项称为瞬时源项。我们在此提出一种瞬时源项迁移模型,该模型可简化评估 CDA 气泡上升过程中冷却剂钠吸收的源项数量。在该模型中,从基本动量方程中得到的 CDA 气泡内的粒子运动被用来计算从气泡界面逸出的源项数量。此外,还使用了一个类似于沉淀清除气溶胶的模型来评估气泡中存在的液滴所吸收的源项数量,尤其是在 CDA 气泡快速膨胀过程中形成的夹带钠液滴。先前的源项迁移实验进一步验证了该模型,在该实验中,一个大型高压气泡在钠池中膨胀并上升。与测量到的源项滞留因子的良好一致性证明了所开发模型的可靠性。鉴于这些结果,我们选择了一些关键参数进行敏感性分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a source-term migration model for a large bubble formed in a core disruptive accident
Because sodium-cooled fast reactors are designed with high inherent safety in mind, the probability of a core disruptive accident (CDA) is extremely low. However, from a defense-in-depth perspective, the study of CDA sequences is still worthwhile to assure the safety and reliability of reactors. During a CDA, a large bubble rapidly expands inside the sodium pool, rises from the core, and covers the gas region, providing a potential migration path for source terms (radioactive materials present within the containment barriers). Source terms released initially within the cover-gas region after a few hundred milliseconds are called instantaneous source terms. We propose here an instantaneous source-term migration model that provides a simplified evaluation of the amount of source terms absorbed by coolant sodium during the ascent of the CDA bubble. In the model, the particle motion within the CDA bubble obtained from the basic momentum equation is used to calculate the amount of source terms escaping from the bubble interface. In addition, a model analogous to aerosol scavenging by precipitation is used to assess the amount of source terms absorbed by droplets present in the bubble, especially the entrained sodium droplets that form during rapid expansion of the CDA bubble. The model is further validated by a previous source term migration experiment in which a large high-pressure bubble expands and rises in a sodium pool. Good agreement with the measured retention factor of a source term demonstrates the reliability of the developed model. Given these results, some key parameters are selected for a sensitivity analysis.
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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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