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2017 Vol.54, Issue 4 Preview Page

Technical Report (Special Issue)

The Status and Outlook of High-Level Radioactive Waste Disposal in Deep Borehole Focusing on Behavior of Large-Diameter Deep Borehole

고준위방사성폐기물 심부시추공 처분 기술의 현황과 전망 – 대구경 장심도 시추공 거동 특성을 중심으로

Bona Park1*
,
Saeha Kwon1
,
Ki-Bok Min1
박 보나1*
,
권 새하1
,
민 기복1
1서울대학교 공과대학 에너지자원공학과
* Corresponding Author
31 August 2017. pp. 377-388
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Abstract

This technical note describes the status and outlook of high-level radioactive waste disposal in a deep borehole, which is considered as an alternative way to isolate spent fuel and/or high-level radioactive waste permanently. The deep borehole disposal (DBD) concept consists of drilling into deep crystalline basement rock, emplacing waste canisters in the lower disposal zone of the borehole, and sealing and plugging the upper portion of the borehole through backfill. To make this concept viable, we should develop a new drilling technology that can achieve relatively larger bottom hole diameter drilling. It is expected that the large diameter drilling contributes to unpredictable borehole instability, e.g., severe borehole breakout or lost circulation, which takes up the additional cost. Furthermore, lack of scientific drilling experience in Korea, compared with other countries with rich experience and obstacle to find an appropriate site still remains as a challenge to overcome.

Keywords
High-level radioacitve waste
Spent fuels
Deep borehole disposal (DBD)
Deep drilling technology

본 기술보고에서는 고준위방사성폐기물 혹은 사용후핵연료를 생태계로부터 영구격리 시키기 위한 방안으로 생태계와의 이격거리가 멀고 투수율이 매우 낮은 지층에 처분하기 때문에 안전성 측면에서 유리하다고 평가되는 심부시추공 처분 기술의 현황 및 전망에 대해 알아보았다. 결정질 기반암이 존재하는 심도까지 시추하여 하부 처분구간에 고준위방사성폐기물 처분용기를 적치하고 상부 구간은 벤토나이트 등으로 완전히 밀봉시키는 이 방식은 아직 기술적으로 실현가능성이 검증되지 못하였다. 현존하는 시추기술로 이 방식을 실현가능하게 하려면 시추공의 직경을 최소 두배로 늘리는 새로운 기술이 개발되어야 한다. 이때 시추공 직경 증가에 따른 크기효과가 시추 시 불안정성을 야기하여 시추비용이 증가할 것으로 예상된다. 또한 선진국에 비해 부족한 기술 축적 현황과 심부시추공 처분장 건설에서 적합한 부지확보의 어려움은 극복해야 할 과제로 남아있다.

키워드
고준위방사성폐기물
사용후핵연료
심부시추공 처분
심부시추 기술
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 54
  • No :4
  • Pages :377-388
  • Received Date : 2017-08-04
  • Revised Date : 2017-08-18
  • Accepted Date : 2017-08-30
  • DOI :https://doi.org/10.12972/ksmer.2017.54.4.377
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