Adaptation of COSYMA and assessment of accident consequences for Daya Bay nuclear power plant in China

The program package COSYMA for assessing the radiological and economic cons equences of nuclear accidents, developed with the support of the European C ommission, was applied to investigate the health effects and risks from acc idental releases of radioactive material from the Daya Bay nuclear power pl ant. Population distribution data in the range of 80 km around the site and hourly meteorological data for the year 1985 representative of accident co nsequence analysis were used. The results showed that early effects are mor e important at distances closer to the site, while the number of fatal canc ers is closely related to the population density and the late effects are s till important at distances larger than 50 km from the site. The mean annua l expected values for early mortality and late mortality estimated for the population within a circle of 80 km around the Daya Bay nuclear power plant are 4.5 x 10(-3) and 0.1 yr(-1) respectively. (C) 2000 Elsevier Science Lt d. All rights reserved.