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环境科学学报 1998
A PROBABILITY CONSEQUENCE ESTIMATION OF DESIGN BASIC ACCIDENT FOR QINSHAN NUCLEAR POWER STATION PLANT (2×600 MW) USING SEGMENT METHOD
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Abstract:
The probability consequence of accident within an assessment area with radius 80 km caused by a Design Basic Accident (DBA) for Qinshan Nuclear Power Station (NPP) second stage (2×600MW) was estimated by using a weather sampling technique and a segment diffusion model. Based on hourly meteorological observation data for 1 year on the Qinshan site, a weather sample sequences was obtained by using stratified sampling technique. Five segments with different duration and different release amounts were adopted to simulate the release of DBA which will last for 30 days. The concept of effective diffusion parameter was used to describe the effect of the stability changes on the diffusion parameter during plume transfer. A set of measured values for diffusion parameters were adopted. The following individual doses were included: external dose from radionuclides in the immersion cloud, internal dose due to inhalation of radionuclides, external dose from dry and wet deposited radionuclides on the ground. The population dose was also estimated. The complementary cumulative frequency distribution CCFD of population dose within assessment area caused by DBA release is finally estimated. The results showed that the population dose cause by DBA for the Qinshan NPP (2×600MW) is more than or equal to about 18 men Sv(95% cumulative probability level) or about 25 men Sv(50% cumulative probability level) respectively.
