严重事故下裂变产物气溶胶自然沉积现象研究

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Study on Natural Deposition of Fission Product Aerosol in Severe Accidents

School of Mechanical Engineering. Shanghai Jiaotong University, Shanghai, 200240, China

摘要: 以600 MW压水堆核电厂为研究对象,在一体化安全分析模型的基础上建立重力沉降、扩散电泳、惯性碰撞和热电泳4种裂变产物气溶胶的自然沉积模型,选取典型的严重事故序列,分析严重事故下裂变产物气溶胶的自然沉积现象。将MELCOR程序的重力沉降模型植入本文的一体化分析模型,对重力沉降份额进行比较。研究表明,重力沉降对气溶胶沉积的贡献最大;本文采用的重力沉降模型比MELCOR程序重力沉降模型的沉降效应稍强。
- 严重事故 /
- 裂变产物气溶胶 /
- 自然沉积
Abstract: Aerosol natural deposition model of gravitational sedimentation,diffusionphoresis,inertial impaction and thermophoresis are established based on integrated safety analysis model for 600 MW pressurized water reactor.Typical severe accidents are chosen,and natural deposition phenomenon of fission product aerosol is analyzed.Additionally,gravitational sedimentation model of MELOCR is coupled into integrated safety analysis model,and fraction of gravitational sedimentation is compared.The results show that gravitational sedimentation is the most important deposition mechanism,and deposition effect of gravitational sedimentation model in this paper is stronger than MELCOR.
- Severe accidents /
- Fission product aerosol /
- Natural deposition