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J Korean Soc Environ Eng > Volume 37(8); 2015 > Article
J Korean Soc Environ Eng 2015;37(8): 465-471. doi: https://doi.org/10.4491/KSEE.2015.37.8.465
불포화 암반 파쇄대를 통한 핵종 이동
김원석1, 김정진1, 안진모1, 남성식1, 엄우용1,2
1포항공과대학교
2북서태평양국가연구소
Fracture Flow of Radionuclides in Unsaturated Conditions at LILW Disposal Facility
Won-Seok Kim1, Jungjin Kim1, Jinmo Ahn1, Seongsik Nam1, Wooyong Um1,2
1Pohang University of Science and Technology (POSTECH)
2Pacific Northwest National Laboratory (PNNL)
Corresponding author  Wooyong Um ,Tel: 054-279-9563, Fax: 054-279-9559, Email: wooyongum@postech.ac.kr
Received: August 19, 2015;  Revised: August 28, 2015;  Accepted: August 30, 2015.  Published online: August 31, 2015.
ABSTRACT
Adsorption experiments for radionuclides such as 3H, 90Sr and 99Tc were conducted using fractured rock collected in unsaturated zone. The released radionuclide through artificial barrier from the near surface repository can be transported by the flow of rainfall or pore water through fractures in unsaturated zone and reach to groundwater flow. Therefore, it is important to investigate transport behavior (retardation) of radionuclides through fractured rock for the safety assessment and long-term performance of repository. Fractured rock samples were collected and characterized by X-ray microtomography (XMT) analysis, which can be used to develop a more robust unsaturated fracture transport model. When fracture-filling materials are exist, distribution coefficient of 90Sr is higher than without fracture-filling materials. In this study, batch sorption distribution coefficient (Kd) of radionuclide was determined and used to increase our understanding of radionuclide retardtion through fracture-filling materials.
Key Words: Fractured Rock, Unsaturated Zone, Radionuclides, Low- and Intermediate- Level Waste, X-ray Microtomography
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