Severe accident has become one of the main directions of research since the crisis at Fukushima plants in Japan, including release of radioactive material, accessibility analysis for staff and evaluation of consequence. This paper, mainly for design basic accident and severe accident, makes calculation of migration and release of radioactive material after accident by considering the different building, also combine the on-site operation requirement of worker after accident, analyzes dose rates of typical zone for staff and evaluate the exposure caused by radioactive material. The main results of the paper supply reference and basis for person accessibility research after design basis accident and severe accident.

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