Browse > Article
http://dx.doi.org/10.7733/jkrws.2011.9.1.23

An Analysis of the Water Saturation Processes in the Engineered Barrier of a High Level Radioactive Waste Disposal System  

Park, Jeong-Hwa (Korea Atomic Energy Research Institute)
Lee, Jae-Owan (Korea Atomic Energy Research Institute)
Kwon, Sang-Ki (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.9, no.1, 2011 , pp. 23-32 More about this Journal
Abstract
An engineering scale test, which is called KENTEX, was carried out to understand and to analyze the coupled thermal, hydrological and mechanical phenomena in the engineered barrier system(EBS) of Korean reference disposal system. Using the experimental data obtained from KENTEX, the water saturation processes in bentonite could be analyzed. From the comparison between the model calculation using ABAQUS and the experimental results, the difference of the water content between them in the unsaturating part was large because the drying phenomena due to moisture redistribution by the temperature gradient could not be included in the model. In the saturating part, the difference of the water content between them was decreased gradually and showed to be small in the full saturation. And the time of about 95% saturation could be estimated about 500 days from the model calculation and experimental results. Also it could be known that the moisture redistribution in the unsaturated part could not be affected on the saturation time of bentonite in the repository. Therefore, it is considered that this model could be used to quantitatively predict the water saturation time in bentonite as EBS for the disposal system.
Keywords
Saturation Processes; Engineered Barrier; Bentonite Buffer; Coupled THM; Disposal System; KENTEX;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Mikko P. Ahola, Goodluck I. Ofoegbu, Asadul H. Chowdhury and Sui-Min Hsiung, "ThermoHydro-Mechanical coupled modeling: Big-Ben experiment, TC3 DECOVALEX-PHASE III", CNWRA 94-021,(1994).
2 Sun Im Jeon, Jae Owan Lee, Won Jin Cho, "Measurement of bentonite-water potential using a thermocouple psychrometer", Transactions of the Korean Nuclear Society, Autumn Meeting, (2007).
3 박정화, 이재완, 권상기, 조원진, "한국형 고준위 폐기물 처분을 위한 공학적 방벽의 실증실험에 대한 열-수리-역학 연계공정 해석", KAERI/TR-3952/2009, KAERI, (2009).
4 고은옥, 이재완, 조원진, 현재혁, 전관식, "불포화 다짐 벤토나이트의 수확산 및 재포화", 한국폐기물학회지 제 4권, 제 1호, (1999).
5 Fujita, T., K. Hara, Y. Yusa, and N. Sasaki. "Application of Elasto-Plastic Model to Mechanical and Hydraulic Behavior of Buffer Material under Water Uptake in a Repository", Materials Research Society Symposium, Vol. 212. (1991).
6 조원진, 이재완, 강철형, 전관식, "고준위폐기물 처분장 완충재용 국산 벤토나이트 및 벤토나이트-모래 혼합물의 물리화학적, 광물학적 및 역학적 특성", KAERI/TR-1388, (1999).
7 Chin-Fu Tsang, Ove Stephansson, Firtz Kantsky and Lanru Jing, "An overview of the DECOVALEX project on coupled THM processes in fractured rock-bentonite system", 2003 Geo Proc., pp 3-13, (2003).
8 C.H.Kang et al, "High Level Radwaste Disposal Technology Development/Geological Disposal System Development", KAERI/RR-2336/2002, KAERI, (2002).
9 Lennart Borgesson, Jan Hernelined "DECOVALEX I Case 3: Calculation of the Big Ben experiment-coupled modelling of the thermal, mechanical and hydraulic behaviour of water-unsaturated material in a simulated deposition hole", SKB Technical report 95-29, (1995),
10 이재완, 권상기, 박정화, 조원진, "고준위폐기물처분장 공학적 방벽의 열적-수리적-역학적 거동 연구: 공학적 규모 실증실험", KAERI/TR-3429/2007, (2007),
11 E. E. Alonso, J, Alcoverro, F, Coste, L, Malinsky, V, Merrien-Soukatchoff ,I. Kadiric, T. Nowak, H. Shao, T. S. Nguyen, A.P.S. Selvadurai, G. Armand, S. R. Sobolik, M. Itamura, C. M. Stone, S. W. Webb, A. Rejeb, M. Tijani, Z. Maouche, A. Kobayashi, H. Kurikami, A. Ito, Y. Sugita, M Chijimatsu, L. Borgesson, J. Hernelind, J. Rutqvist, C.-F. Tsang, P. Jussila, "The FEBEX benchmark test: case definition and comparison of modelling approaches", International Journal of Rock Mechanics & Mining Sciences, 42, pp 611-638, (2005).   DOI   ScienceOn
12 박정화, 이재완, 권상기, 조원진, "고준위 방사성 폐기물 처분시스템 실증실험용 KENTEX 장치에서의 열-수리-역학 연동현상 해석", 방사성폐기물학회지, 4(2), pp 117-131, (2006).
13 Hibbitt, Karlsson and Sorensen, ABAQUS Manuals, HKS Inc. (2003).
14 조원진, 전관식, 이재완, "고준위 폐기물 처분장 완충재용 국산 압축 벤토나이트의 수리전도도에 미치는 건조 밀도와 온도의 영향", KAERI/TR-1223/99, KAERI, (1999).
15 J. S. Y. Wang, T. N.Narasimhan, "Processes, mechanisms, parameters, and modeling approaches for partially saturated flow in soil and rock media." SAND88-7054, (1993).