Study on Fire Risk Assessment on Round Irradiation Room of Stacking under Stuck Radioactive Sources

The typical 60Co round irradiation room of stacking has been taken as a research subject. Ignition temperatures of common radiation cargo were measured through the experiments, minimum ignition temperature is 210 °C. In order to discuss the temperature variation and temperature field under stuck radioactive sources, the fire scenario was presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive source broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. The temperature field in the irradiation room tends to be the same after two hours. The stuck radioactive source occurred after 7.2 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited.