Safety Risk Assessment of Mobile Microreactor Transportation

YAN Fengzhe; ZHAO Qiang; LIU Jialing; ZHU Zhigang; ZHANG Futong

doi:10.19554/j.cnki.1001-3563.2024.21.008

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Packaging Engineering ›› 2024 ›› Issue (21) : 48-54. DOI: 10.19554/j.cnki.1001-3563.2024.21.008

Safety Risk Assessment of Mobile Microreactor Transportation

YAN Fengzhe, ZHAO Qiang, LIU Jialing, ZHU Zhigang, ZHANG Futong

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Abstract

In view of the fact that the current R&D level of mobile microreactor cannot meet the requirements of the GB11806-2019 Regulations for the Safe Transport of Radioactive Materials , the work aims to study the transportation safety of mobile microreactor by means of risk assessment. The risk assessment mainly included calculating the probability and consequences of extreme accidents encountered by the mobile microreactor during transportation, and the types of accidents that the mobile microreactor might encounter during transportation were sorted out according to the relevant requirements of 10CFR71 and §12 of the United States. The collision with the tanker truck with the most serious accident consequences was taken as the extreme hypothetical accident and the accident consequences of the mobile microreactor with a hypothetical heat power of 20 MWt under a hypothetical accident were calculated by the method of five-factor formula. The hypothetical accident probability of the mobile microreactor was 9.7×10–6/year under the condition of annual transportation, and the irradiation dose to the workers under the hypothetical accident after the microreactor was cooled for one year was 810 mSv. After 5 years of cooling, the radiation dose to the workers under a hypothetical accident was 590 mSv. The consequences of the mobile microreactor under the hypothetical accident far exceed the irradiation dose limits for workers in SSG-26 Advisory Material for the IAEA Regulations for the Safe Transport of Radioactive Material and the GB 18871—2002 Safety Standard for Protection against Ionizing Radiation and Radiation Sources . Moreover, the probability of hypothetical accidents does not meet China's nuclear safety guidelines screening requirement of 10–7/year for beyond design basis accidents. Therefore, it is necessary to take management measures, including armed escort and route planning, during the transportation of mobile microreactors, to reduce the probability of hypothetical accidents, and to take corresponding emergency measures to mitigate the accident consequences of hypothetical accidents to meet the regulatory requirements of the nuclear safety authorities.

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YAN Fengzhe, ZHAO Qiang, LIU Jialing, ZHU Zhigang, ZHANG Futong. Safety Risk Assessment of Mobile Microreactor Transportation[J]. Packaging Engineering. 2024(21): 48-54 https://doi.org/10.19554/j.cnki.1001-3563.2024.21.008