Calculation of radiation dose of area surrounding nuclear power plant with MACCS during sever accident

According to statistical data information of the population distribution, agriculture, farming and animal husbandry in the 80 km long range area around a nuclear power plant in Fujian and the radiative source term released from the power plant during severe accident, the maximum equivalent dose distributions received by the public in the area are simulated with the program of MACCS1.5. The results show that radiation dose distribution near-field region (0-3 km) of the nuclear power plant change fastest. The simulation values of the short-term collective effective dose within the radius of 5 km and 10 km regions are 6.05 × 10⁴ person·Sv/a and 5.25 × 10⁵ person·Sv/a, respectively. The calculation maximum individual effective dose value is about 9.77×10^-1 mSv/h. However, it is found that the maximum dose contribution source to the public or individual comes from the gaseous state nuclide of ³H. Then, the appropriate emergency protective action suggestions are offered in the work based on the simulation results and standard dose limits. (authors)