Offsite Radiological Consequence Analysis of Hypothetical Accidents for APR1400

Abstract

About 25% (113 units) of the world’s nuclear power plants (NPPs) are operating inNortheast Asia including Korea, China, Japan and Taiwan as of June 2019 based on the powerreactor information system (PRIS) of International Atomic Energy Agency (IAEA). Accordingly,the possibility of exposure to unexpected nuclear accidents in Northeast Asia is getting higherand higher. With guidance of lessons learned from previous nuclear disasters such as the ThreeMile Island accident in 1979, the Chernobyl accident in 1986 and Fukushima accident in 2011,offsite radiological consequence analysis using computerized software has been considered as oneof essential quantitative risk communication in order to identify and discuss public concerns andworries about nuclear safety and public health risk in case of hypothetical nuclear accidents aroundspecific NPPs. In this study, radiological assessment system for consequence analysis (RASCAL)developed by U.S. Nuclear Regulatory Commission (NRC) and Northeast Asia nuclear accidentsimulator (NANAS) developed by Nuclear Safety and Security Commission (NSSC) in Korea wereintegrally used to quantify the offsite radiological consequences and to examine the emergencyprotective measures for the general public around regions of Shin Kori unit 3, the first commercialreactorof advanced power reactor 1400 MWe (APR1400). Comprehensive simulations of radiologicalsource term estimation, atmospheric dispersion analysis and radiation dose assessment to thepublic have been performed in case of two hypothetical nuclear accidents involving station black out(SBO) and loss of coolant accident (LOCA).