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Graphite dust emission evaluation in an HTGR depressurization accident
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.anucene.2020.107664
Qi Sun , Feng Xie , Wei Peng , Ximing Sun

Abstract This study evaluated graphite dust emissions in an HTGR depressurization accident. A simplified experimental platform based on air at ambient temperature was developed to simulate particle resuspension during a depressurization accident and helium blower startup. Then, computational fluid dynamics models were used to calculate the impact, rebound, and deposition of graphite particles to determine the particle deposition fraction in the containment based on the HTR-PM design parameters. The classical deposition formula was then used to estimate the proportion of particles released into the environment through a releasing pipe. The results show that the mass of particles released increases with decreasing helium temperature. The release mass first increases and then decreases with increasing particle diameter. This analysis shows that about 3–5 g of particles will be released to the environment in a design-basis HTR-PM depressurization accident.

中文翻译:

高温气冷堆减压事故中石墨粉尘排放评价

摘要 本研究评估了高温气冷堆减压事故中石墨粉尘的排放。开发了一个基于环境温度下空气的简化实验平台,用于模拟减压事故和氦风机启动期间的颗粒再悬浮。然后,使用计算流体动力学模型计算石墨颗粒的冲击、回弹和沉积,以确定基于 HTR-PM 设计参数的安全壳中的颗粒沉积分数。然后使用经典的沉积公式来估计通过释放管道释放到环境中的颗粒的比例。结果表明,释放的粒子质量随着氦气温度的降低而增加。释放质量随着粒径的增加先增加然后减少。
更新日期:2020-11-01
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