This paper discussed UF6 leak scenarios in transportation accidents, it’s different from UF6 release accident occur in nuclear fuel cycle facilities. On transport condition, physical changes and direct chemical reaction with vapor will happen after UF6 release, and then diffusion. Combined with physical properties, chemical properties and straight-line Gaussian plume models, this paper established a new diffusion model for UF6. Based on the data of three UF6 release experiments carried by the French Bordeaux National Experimental Base and calculation data of HGSYSTEM/UF6 model, the new model was tested preliminary. The result shows that, this model can describe the diffusion of UF6 in environment accurately, and apply to UF6 transport accident assessment.

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