Abstract: Aimed at a special situation of a research reactor with high power to be constructed in the suburb of a big city, the acceptance criteria on the radiological consequences of severe accidents in China Advanced Research Reactor (CARR) were put forward. In order to carry through the design of discharging scheme of CARR’s severe accidents, the environmental radiological consequences under various accidental discharging schemes were researched when a severe accident probably occurs in CARR. A combination scheme of accidental discharging was recommended by improving the airtight of reactor hall and optimizing the starting time and period of obturation and ventilation. The target of CARR project safety design that there is no off site emergency situation is realized.