Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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A Conceptual Study for Deep Borehole Disposal of High Level Radioactive Waste in Korea

국내 고준위 방사성 폐기물 심부시추공 처분을 위한 개념 연구

  • Jeon, Byungkyu (Department of infra engineering, SK E&C) ;
  • Choi, Seungbeom (Research institute of energy and resources, Seoul National University) ;
  • Lee, Sudeuk (Department of energy systems engineering, Seoul National University) ;
  • Jeon, Seokwon (Department of energy systems engineering, Seoul National University)
  • 전병규 (SK건설(주) Infra Engineering 2팀) ;
  • 최승범 (서울대학교 에너지자원신기술 연구소) ;
  • 이수득 (서울대학교 공과대학 에너지시스템공학부) ;
  • 전석원 (서울대학교 공과대학 에너지시스템공학부)
  • Received : 2019.04.09
  • Accepted : 2019.04.24
  • Published : 2019.04.30
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Abstract

With Kori nuclear power plant unit 1 as a beginning in April 1978, 24 nuclear power plants have been operated in Korea and two more plants are under construction. As the nuclear power plants being operated, radioactive wastes from the plants have been accumulated so that various methods for disposing them have been proposed. In Korea, researches have been conducted, being focused on DGD (Deep Geological Disposal), however, DBD (Deep Borehole Disposal) method needs considering as an alternative. In this technical note, element technologies for DBD were analyzed by compiling previous researches and their applicability on domestic cases were investigated. Conceptual studies regarding relevant designs were conducted and finally, technical challenges for actual disposal were described.

우리나라는 1978년 4월 고리1호기를 시작으로 지금까지 총 24기의 원전을 가동하고 있으며 2기의 원전이 건설 중이다. 원자력 발전이 지속됨에 따라 원자력발전소에서 발생하는 방사성 폐기물의 양도 늘어나게 되어 이를 영구처분하기 위한 다양한 방법이 제안되어 왔다. 국내에서는 심층처분(DGD)을 중심으로 연구가 진행되어 왔으나 심부 시추공을 활용하는 심부시추공 처분(DBD) 역시 대안으로 고려할 필요가 있다. 본 논문에서는 기술 선진국의 선행 연구결과를 종합하여 심부시추공 처분에 요구되는 요소기술들을 소개하고 이를 국내에 적용하기 위한 적용성 평가를 수행하였다. 시추공 설계, 처분부지 등에 대한 개념적 연구를 수행하였으며 마지막으로 실제 처분을 위하여 향후 요구되는 기술적 과제에 대하여 정리하였다.

Keywords

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Fig. 1. Conceptual design of DBD; (a) Borehole and casing design in USA (SNL, 2011), and (b) Borehole design in Sweden (MKG, 2006)

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Fig. 1. Conceptual design of DBD; (a) Borehole and casing design in USA (SNL, 2011), and (b) Borehole design in Sweden (MKG, 2006) (Continued)

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Fig. 2. Schematic diagram of borehole and casing design in Germany; (a) Geological condition, and (b) Casing design of KTB borehole (Bracke et al., 2017)

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Fig. 3. Conceptual design of DBC-R (Bracke el al., 2017)

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Fig. 4. Schematic diagram for disposal sequence (SNL, 2011)

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Fig. 5. Conceptual design of sealing; (a) Sealing design in USA (SNL, 2011), and (b) Sealing design in Germany (Bracke et al., 2017)

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Fig. 5. Conceptual design of sealing; (a) Sealing design in USA (SNL, 2011), and (b) Sealing design in Germany (Bracke et al., 2017) (Continued)

Table 1. Specification of borehole and casing design in USA (SNL, 2011)

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Table 2. Possible scenarios for DBD design

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Table 3. Canister design plan for each DBD scenario

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Table 4. Simulation results about disposal area according to each scenario

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Table 5. Deep borehole cases in overseas

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