A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident
A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident
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DOI：
10.1007/s41365-022-01007-z
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发表时间：
2022-02
影响因子：
2.8
通讯作者：
Fang-Jie Zhao;Shu-liang Zou;Shoulong Xu;Xuan Wang;Jia-ling Wang;D. Tang
中科院分区：
文献类型：
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作者：
Fang-Jie Zhao;Shu-liang Zou;Shoulong Xu;Xuan Wang;Jia-ling Wang;D. Tang
某船用核反应堆发生严重事故，导致放射性核素泄漏，给工作人员造成安全隐患，并造成环境污染的不良影响。因此，有必要提出一种新的方法来研究海洋核反应堆严重事故后放射性核素在受限环境中的扩散。因此，本研究提出了一种新的方法，严重事故分析程序MELCOR耦合计算流体动力学scSTREAM研究放射性扩散严重事故。将MELCOR计算的放射性核素释放分数和温度与scSTREAM计算相结合，研究了在不同通风系统风速和扩散速度条件下，放射性核素在反应堆不同空间环境中的扩散行为和扩散现象。结果表明，通风系统风速很小或为零，放射性核素紊流扩散不明显，以凝结沉降和重力沉降形式缓慢扩散。当通风系统的风速增加时，放射性核素的流动遇到壁并形成涡流，影响扩散到室2中的放射性核素的时间变化。通风系统的风速和扩散速度对放射性核素扩散到四个室中的时间变化趋势有相反的影响。
A severe accident in a marine nuclear reactor leads to radionuclide leakage, which causes hidden dangers to workers and has adverse effects of environmental pollution. It is necessary to propose a novel approach to radionuclide diffusion in a confined environment after a severe accident in a marine nuclear reactor. Therefore, this study proposes a new method for the severe accident analysis program MELCOR coupled with computational fluid dynamics scSTREAM to study radioactive diffusion in severe accidents. The radionuclide release fraction and temperature calculated by MELCOR were combined with the scSTREAM calculations to study the radionuclide diffusion behavior and the phenomenon of radionuclide diffusion in different space environments of the reactor under the conditions of varying wind velocities of the ventilation system and diffusion speed. The results show that the wind velocity of the ventilation system is very small or zero, and the turbulent diffusion of radionuclides is not obvious and diffuses slowly in the form of condensation sedimentation and gravity settlement. When the wind speed of the ventilation system increases, the flow of radionuclides meets the wall and forms eddy currents, affecting the time variation of radionuclides diffusing into chamber 2. The wind velocity of the ventilation system and the diffusion speed has opposite effects on the time variation trend of radionuclide diffusion into the four chambers.