Abstract: On August 10, 1985, K-431, the former Soviet E-2 class nuclear submarine, suffered a reactor criticality, explosion and combustion accident during refueling. The accident resulted in the death of 10 crew members. Based on the meteorological data at the time of the accident, the unfavorable meteorological conditions for China, and the HYSPLIT program, this paper evaluated the potential radiation impact of the accident source terms on China. The results show that the maximum effective dose for individuals in China is of the order of 10^-5 mSv under the two meteorological conditions. Although the radiation impact of the accident is small, similar threats need to be paid attention, and relevant monitoring and evaluation system needs to be strengthened.

Key words: nuclear submarine accident, radiation impact, accident evaluation