A STUDY ON UF6 TRANSPORTATION ACCIDENT SCENARIOS AND DIFFUSION MODEL

摘要

This paper discussed UF_6 leak scenarios in transportation accidents, it's different from UF_6 release accident occur in nuclear fuel cycle facilities. On transport condition, physical changes and direct chemical reaction with vapor will happen after UF_6 release, and then diffusion. Combined with physical properties, chemical properties and straight-line Gaussian plume models, this paper established a new diffusion model for UF_6. Based on the data of three UF_6 release experiments carried by the French Bordeaux National Experimental Base and calculation data of HGSYSTEM/UF_6 model, the new model was tested preliminary. The result shows that, this model can describe the diffusion of UF_6 in environment accurately, and apply to UF_6 transport accident assessment.