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Atmospheric Dispersion of Radioactive Material according to the Local Wind Patterns around the Kori Nuclear Power Plant using WRF/HYSPLIT Model

WRF/HYSPLIT 모델을 이용한 고리원전 인근 국지바람 패턴에 따른 방사성물질 대기확산 특성

  • An, Hye Yeon (Division of Earth Environmental System, Pusan National University) ;
  • Kang, Yoon-Hee (The Institute of Environmental Studies, Pusan National University) ;
  • Song, Sang-Keun (Department of Earth and Marine Sciences, Jeju National University) ;
  • Bang, Jin-Hee (Environmental Health Center, University of Ulsan College of Medicine) ;
  • Kim, Yoo-Keun (Division of Earth Environmental System, Pusan National University)
  • 안혜연 (부산대학교 지구환경시스템학부) ;
  • 강윤희 (부산대학교 환경연구원) ;
  • 송상근 (제주대학교 지구해양과학과) ;
  • 방진희 (울산대학교 의과대학 환경보건센터) ;
  • 김유근 (부산대학교 지구환경시스템학부)
  • Received : 2014.11.13
  • Accepted : 2014.12.15
  • Published : 2015.01.30

Abstract

The characteristics of atmospheric dispersion of radioactive material (i.e. $^{137}Cs$) related to local wind patterns around the Kori nuclear power plant (KNPP) were studied using WRF/HYSPLIT model. The cluster analysis using observed winds from 28 weather stations during a year (2012) was performed in order to obtain representative local wind patterns. The cluster analysis identified eight local wind patterns (P1, P2, P3, P4-1, P4-2, P4-3, P4-4, P4-5) over the KNPP region. P1, P2 and P3 accounted for 14.5%, 27.0% and 14.5%, respectively. Both P1 and P2 are related to westerly/northwesterly synoptic flows in winter and P3 includes the Changma or typhoons days. The simulations of P1, P2 and P3 with high wind velocities and constant wind directions show that $^{137}Cs$ emitted from the KNPP during 0900~1400 LST (Local Standard Time) are dispersed to the east sea, southeast sea and southwestern inland, respectively. On the other hands, 5 sub-category of P4 have various local wind distributions under weak synoptic forcing and accounted for less than 10% of all. While the simulated $^{137}Cs$ for P4-2 is dispersed to southwest inland due to northeasterly flows, $^{137}Cs$ dispersed northward for the other patterns. The simulated average 137Cs concentrations of each local wind pattern are $564.1{\sim}1076.3Bqm^{-3}$. The highest average concentration appeared P4-4 due to dispersion in a narrow zone and weak wind environment. On the other hands, the lowest average concentration appeared P1 and P2 due to rapid dispersion to the sea. The simulated $^{137}Cs$ concentrations and dispersion locations of each local wind pattern are different according to the local wind conditions.

Acknowledgement

Supported by : 한국연구재단

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