中文摘要：

采用高斯分段烟羽模型估算了滨海地区某船用堆发生断电事故后放射性核素在港区10km范围内的大气扩散规律,计算中源项数据由MELCOR程序计算获得,计算分析采用放射性后果评价软件MACCS进行。研究表明：在距释放源一定范围内,释放高度、大气稳定度、尾流都对放射性核素扩散有较大影响;降雨量对I131扩散有较大影响,但对Xe133扩散没有影响。该研究可为进一步研究应急决策及应急计划区的划分提供技术支持。

英文摘要：

Based on the model of GAUSSION subsection plume, the radioactive plume atmospheric dispersion rule in the terrain of 10 km from the harbor is figured out when the ship reactor blackout accident happens. The source term obtained by MELCOR is calculated and analyzed by means of the analysis software of atmospheric dispersion MACCS. The studies show that the releasing altitude, the atmospheric stabilization and the wake have a greater effect on the radioactive nuclide diffusion; the rainfall has a greater influence on the I^131 diffusion, but no influence on the Xe^133 diffusion. The research can provide a reference for nuclear emergency decision and technical support for emergency plan division.