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Evaluation of Silicon Carbide (SiC) for Deep Borehole Disposal Canister
Minsoo LEE,Jongyoul LEE,Heuijoo CHOI,MalGoBalGaeBitNaLa YOO,Sunghoon JI 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 70 W·m-1·K-1 at 100℃. 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℃. Therefore, it was concluded that SiC ceramics could be a good alternative to carbon steel in application to deep borehole disposal canisters.
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.