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2022 Vol.32, Issue 1 Preview Page

Technical Note

Design Considerations for Buffer Materials and Research Status of Enhanced Buffer Materials

완충재 설계시 고려사항 및 고기능 완충재 연구 현황

Gi-Jun Lee1
,
Seok Yoon2*
,
Taehyun Kim3
,
Jin-Seop Kim2
이 기준1
,
윤 석2*
,
김 태현3
,
김 진섭2
1Post-Doctoral Researcher, Korea Atomic Energy Research Institute
2Principal Researcher, Korea Atomic Energy Research Institute
3Senior Researcher, Korea Atomic Energy Research Institute
1한국원자력연구원 박사후연수생
2한국원자력연구원 책임연구원
3한국원자력연구원 선임연구원
*Corresponding Author
28 February 2022. pp. 59-77
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Abstract

Currently, the design reference temperature of the buffer material for disposing of high-level radioactive waste is less than 100°C, so if the heat dissipation capacity of the buffer material is improved, the spacings of the disposal tunnel and the deposition hole in the repository can be reduced. First of all, this study tries to analyze the criteria for thermal-hydraulic-mechanical performance of the buffer materials and to investigate the researches regarding the enhanced buffer materials with improved thermal conductivity. First, the thermal conductivity should be as high as possible and is affected by dry density, water content, temperature, mineral composition, and bentonite type. the organic content of the buffer material can have a significant effect on the corrosion performance of a canister, so the organic content should be low. In addition, hydraulic conductivity of the buffer material should be less than that of near-field rock and swelling pressure should be appropriate for buffer materials to function properly. For the development of enhanced buffer materials, additives such as sand, graphite, and graphite oxide are typically used, and a thermal conductivity can be greatly improved with a very small amount of graphite addition compared to sand.

Keywords
Bentonite
Enhanced bentonite
Impact factors
High-level radioactive waste repository

현재 고준위방사성폐기물 처분을 위한 완충재의 설계 기준 온도는 100 ℃ 미만이기에 완충재의 열 분산 능력이 개선된다면 처분장의 처분 터널과 처분 공의 간격을 줄일 수 있다. 본 연구에서는 완충재의 열-수리-역학 성능 기준을 분석하고자 하였으며, 완충재의 열전도도를 개선할 수 있는 고기능 완충재의 연구 현황에 대해 알아보고자 하였다. 우선, 열전도도는 가능한 높아야 하며 완충재의 열전도도 값은 건조밀도, 함수비, 온도, 광물조성, 벤토나이트 유형에 영향을 받는다. 또한 완충재에 함유된 유기물은 처분용기의 부식 성능에 큰 영향을 미칠 수 있기에 완충재의 유기물 함량은 매우 낮아야 한다. 수리전도도는 근계암반보다 더 낮게 설정해야 하며, 완충재가 제 기능을 하기 위해 팽윤성이 적정해야 한다. 고기능 완충재 개발을 위해 대표적으로 모래, 흑연, 산화 흑연 등의 첨가제를 사용하며 흑연의 경우 모래보다 아주 적은 첨가량으로 열전도도를 크게 향상시킬 수 있다.

키워드
벤토나이트
고기능 벤토나이트
영향인자
고준위방사성폐기물 처분장
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 32
  • No :1
  • Pages :59-77
  • Received Date : 2022-02-11
  • Revised Date : 2022-02-17
  • Accepted Date : 2022-02-18
  • DOI :https://doi.org/10.7474/TUS.2022.32.1.059
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