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고준위폐기물 처분장의 완충재용 국내산 벤토나이트의 특성 측정
유맑고밝게빛나라,최희주,이민수,이승엽 한국방사성폐기물학회 2016 방사성폐기물학회지 Vol.14 No.2
심지층 처분시스템에서 완충재는 지하수 유입으로부터 처분용기를 보호하고, 방사성 핵종 유출을 저지하기 위한 중요한 방벽의 하나이다. 이에 완충재는 장기 건전성, 낮은 수리전도도, 낮은 유기물의 함량, 높은 핵종저지능, 높은 팽윤성, 높은 열전도도 등 기술적 요건을 충족시켜야 하며 이는 정량적 분석결과를 바탕으로 결정될 수 있다. 국내의 경우 한국원자력연구원에서는 1997년부터 경주지역에서 생산되는 벤토나이트를 완충재 후보물질로 연구를 지속하고 있다. 본 논문에서는 최근동일 지역에서 생산된 벤토나이트(KJ-II)의 7가지 물리적 및 화학적 특성을 평가하였다. 분석 결과, 국내산 벤토나이트의 몬모릴로나이트 함량은 약 65% 정도이며, 벤토나이트는 Ca형 벤토나이트이다. 본 논문을 통해 완충재 후보물질의 성능평가항목과 분석 방법에 대한 기준을 제시하고자 하였다. The buffer in geological disposal system is one of the major elements to restrain the release of radionuclide and to protect the container from the inflow of groundwater. The buffer material requires long-term stability, low hydraulic conductivity, low organic content, high retardation of radionuclide, high swelling pressure, and high thermal conductivity. These requirements could be determined by the quantitative analysis results. In case of South Korea, the bentonites produced in Gyeongju area have been regarded as candidate buffer/backfill materials at KAERI (Korea Atomic Energy Research Institute) since 1997. According to the study on several physical and chemical characteristics of domestic bentonite in the same district, this is the Ca-type bentonite with about 65% of montmorillonite content. Through this study, we present the criteria for the performance evaluation items and methods when collecting new buffer/backfill materials.
심부시추공 처분용기 재료로서 SiC 세라믹의 적합성 평가
이민수,이종열,최희주,유맑고밝게빛나라,지성훈,LEE, Minsoo,LEE, Jongyoul,CHOI, Heuijoo,YOO, MalGoBalGaeBitNaLa,JI, Sunghoon 한국방사성폐기물학회 2018 방사성폐기물학회지 Vol.16 No.2
To overcome the low mechanical strength and corrosion behavior of a carbon steel canister at high temperature condition of a deep borehole, SiC ceramics were studied as an alternative material for the disposal canister. In this paper, a design concept for a SiC canister, along with an outer stainless steel container, was proposed, and its manufacturing feasibility was tested by fabricating several 1/3 scale canisters. The proposed canister can contain one PWR assembly. The outer container was also prepared for the string formation of SiC canisters. Thermal conductivity was measured for the SiC canister. The canister had a good thermal conductivity of above $70W{\cdot}m^{-1}{\cdot}K^{-1}$ at $100^{\circ}C$. The structural stability was checked under KURT environment, and it was found that the SiC ceramics did not exhibit any change for the 3 year corrosion test at $70^{\circ}C$. Therefore, it was concluded that SiC ceramics could be a good alternative to carbon steel in application to deep borehole disposal canisters.