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Analysis of Source Terms at Domestic Nuclear Power Plant with CZT Semiconductor Detector

CZT 반도체 검출기를 이용한 국내 원전 내 선원항 분석

  • Kang, Seo Kon (Korea Hydro & Nuclear Power Co., LTD, Radiation Health Research Institute) ;
  • Kang, Hwayoon (Korea Hydro & Nuclear Power Co., LTD, Radiation Health Research Institute) ;
  • Lee, Byoung-Il (Korea Hydro & Nuclear Power Co., LTD, Radiation Health Research Institute) ;
  • Kim, Jeong-In (Korea Hydro & Nuclear Power Co., LTD, Radiation Health Research Institute)
  • 강서곤 (한국수력원자력(주) 방사선보건연구원) ;
  • 강화윤 (한국수력원자력(주) 방사선보건연구원) ;
  • 이병일 (한국수력원자력(주) 방사선보건연구원) ;
  • 김정인 (한국수력원자력(주) 방사선보건연구원)
  • Received : 2013.12.10
  • Accepted : 2014.02.07
  • Published : 2014.03.31

Abstract

A lot of radiation exposure for radiation workers who are engaged in Nuclear Power Plants, especially PWRs, have been caused during the outage by CRUD, such as $^{58}Co$, $^{60}Co$, in Reactor Coolant System. And therefore we need to know source terms to achieve optimization of protection for the radiation workers from radiation exposure at Nuclear Power Plants efficiently. This study analyzed source terms at domestic NPPs (PWRs) nearby Steam Generator with CZT semiconductor detector using by IN-VIVO method during the outage for the first time in the country. We checked difference for the detected source terms between old and new NPP. It was performed especially to see a change of source terms by water chemistry process as well. There was not any difference by water chemistry process both NPPs. The main source terms are $^{58}Co$ and $^{60}Co$ at all NPPs. $^{59}Fe$ only appears in the new NPP. $^{137}Cs$ and $^{95}Zr$ are shown in the old NPP. The fraction of $^{58}Co/^{60}Co$ in the new NPP is higher than the old NPP for increasing the specific activity of $^{60}Co$.

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