铀燃料元件制造设施UF6泄漏后室内行为初步分析

Preliminary Analysis on Indoor Behaviors of Leaked UF6 in Uranium Fuel Fabrication Facilities

为分析UF6泄漏事故细节,包括泄漏流量变化和泄漏到室内后的行为,基于UF6容器内的质量和能量平衡以及室内的质量平衡,建立了UF6室内释放源项分析模型;采用此模型对国内铀燃料元件制造设施安全分析报告中分析的典型UF6泄漏事故进行了分析,得到了事故中容器内的物相变化、泄漏流量和泄漏物态变化;同时得到了泄漏后室内的有害物质浓度和沉降量;以及最终排放到环境中的有害物质浓度等数据。这些数据可为应急计划的实施和环境影响评估提供源项数据。

In order to analyze UF6 leakage accident in detail, including the leakage flow changes and the behavior when it leaks into the room, based on the mass and energy balance in the UF6 container and the mass balance in the room, a source term analysis model of UF6 indoor release is established. This model is used to analyze the typical UF6 leakage accident in the safety analysis report of domestic uranium fuel fabrication facilities. Some information are obtained, including phase change, leakage flow and the change of leakage state in the container, the concentration and deposition of hazardous materials in the room after leakage, and the concentration of hazardous materials eventually discharged into the environment, which can be used for the implementation of emergence plans and environmental impact assessments.