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PbTe添加剂LBE气溶的沉积行为和Te价值预测:平台测试和第一原则计算

Yuqing Wang¹, Hui Du², Yi Tan³

¹Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong 519082, China.

Journal of hazardous materials

|November 30, 2024

概括

这项研究引入了一种新的测试平台,用于测量-比斯穆特 (LBE) 气溶的气溶特性,这对于预测快反应堆中的 (Po) 迁移至关重要. 关于粒子大小和沉速度的实验数据验证了辐射危险管理的理论模型.

科学领域:

核工程核工程是指核工程.
环境科学环境科学
材料科学材料科学材料科学

背景情况:

了解波 (Po) 气溶的源期和环境迁移对于使用- (LBE) 冷却剂的快速反应器中辐射危险管理至关重要.
现有的数值模拟提供了对210气溶行为的理论见解,但实验验证因缺乏关于粒子大小分布和沉速度的数据而受到限制.

研究的目的:

设计和建立一个LBE气溶测试平台 (LATP) 用于实验性测量气溶特性.
为了获得关键的粒子度和尺寸分布数据来预测Po迁移.
验证理论模型并改善预测不同反应堆条件下的波迁移.

主要方法:

开发并使用了一种新的LBE气溶测试平台 (LATP).
在实验中使用 (Te) 作为的替代物.
使用气溶光谱仪和扫描移动性颗粒尺寸仪测量颗粒度和尺寸分布.
进行了第一原理计算和X射线光电子光谱,以了解气溶成分.

主要成果:

在LATP成功测量了PbTe-doped LBE气溶颗粒大小分布范围从0到800 nm.
在47 nm (正常条件,873 K) 和41 nm (事故条件,1223 K) 观察到尖端粒子大小.
在这两种条件下,粒子的最大质量度发生在200-300纳米范围内.
沉速度随着粒子大小的增加而增加,从5.0×10−7到7.1×10−5m/s不等.
PbTe-合的LBE气溶在与氧气相互作用时优先形成TeO2.

结论:

开发的LATP提供了重要的实验数据,用于验证LBE冷却快速反应堆中气溶迁移的理论模型.
这些发现提供了一种可靠的方法来预测波迁移特征,特别是在严重事故场景下.
这项研究弥合了理论模拟和实验验证之间的差距,增强了辐射安全评估.

关键词:

(210) 在PoPo.气溶是一种气溶.LBE LBE 的意思是说.-比斯穆特快速反应堆中的.定位速度yy定位速度y

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