卡源故障下悬挂链式辐照室火灾危险性研究

为了分析悬挂链式辐照室的火灾危险性，采用实验测定得出室内典型辐照物品的点着温度，通过设置3组火灾场景模拟得到卡源故障下各火灾场景辐照室内温度变化曲线。结果表明:各火灾场景卡源初期1 h，温度上升速度较快。随着时间的增长，室内温度不断上升，但上升速率逐渐放缓。在火灾场景A，B，C等3组条件下卡源故障分别发生9，4，2.4 d后，室内局部温度能达到210℃，室内辐照物品有可能被引燃。

Study on fire risk of irradiation room with hanging chain conveyor under the fault of stuck radioactive sources

To analyze the fire risk of irradiation room with hanging chain conveyor, the ignition temperatures of typical radiation cargos in the irradiation room were measured through the experiment, and the variation curves of temperature in the irradiation room under the fault of stuck radioactive sources in each fire scenario were obtained through the simulation by setting three fire scenarios. The results showed that the temperature rises rapidly within 1 hour in the initial stage of stuck radioactive sources under each fire scenario. The temperature in the irradiation room rises continually with the growth of time, but the rising rate slows down gradually. The local temperature in the irradiation room can reach 210 ℃ when the fault of stuck radioactive sources occurs for 9 days, 4 days and 2.4 days respectively in three fire scenarios A, B and C, so the radiation cargos in the irradiation room may be ignited.