Une approche de modélisation hybride pour évaluer le système d’écoulement des eaux souterraines aux niveaux bas et intermédiaire du site de stockage de déchets radioactifs de Gyeong-Ju en Corée du Sud Una aproximación de modelo híbrido para evaluar el sistema de flujo de agua subterránea de un repositorio de residuos radiactivos de nivel bajo e intermedio en Gyeong-Ju, Corea 用一种混合建模方法评估韩国庆州市中低放废物处置场地下水流系统 한국 경주 중저준위 폐기물 처분 부지의 지하수 유동 시스템 평가를 위한 혼합 모형 접근 방법 Uma abordagem de modelação híbrida para analisar o sistema de fluxo subterrâneo no local de armazenamento de resíduos radioativos de nível baixo a intermédio em Gyeong-Ju, Coreia

Ji, Sung-Hoon; Park, Kyung Woo; Lim, Doo-Hyun; Kim, Chunsoo; Kim, Kyung Su; Dershowitz, William

Une approche de modélisation hybride pour évaluer le système d’écoulement des eaux souterraines aux niveaux bas et intermédiaire du site de stockage de déchets radioactifs de Gyeong-Ju en Corée du Sud Una aproximación de modelo híbrido para evaluar el sistema de flujo de agua subterránea de un repositorio de residuos radiactivos de nivel bajo e intermedio en Gyeong-Ju, Corea 用一种混合建模方法评估韩国庆州市中低放废物处置场地下水流系统 한국 경주 중저준위 폐기물 처분 부지의 지하수 유동 시스템 평가를 위한 혼합 모형 접근 방법 Uma abordagem de modelação híbrida para analisar o sistema de fluxo subterrâneo no local de armazenamento de resíduos radioativos de nível baixo a intermédio em Gyeong-Ju, Coreia | A hybrid modeling approach to evaluate the groundwater flow system at the low- and intermediate-level radioactive waste disposal site in Gyeong-Ju, Korea

2012

The development and implementation of a hybrid discrete fracture network/equivalent porous medium (DFN/EPM) approach to groundwater flow at the Gyeong-Ju low- and intermediate-level radioactive waste (LILW) disposal site in the Republic of Korea is reported. The geometrical and hydrogeological properties of fractured zones, background fractures and rock matrix were derived from site characterization data and implemented as a DFN. Several DFN realizations, including the deterministic fractured zones and the stochastic background fractures, whose statistical properties were verified by comparison with in-situ fracture and hydraulic test data, were suggested, and they were then upscaled to continuums using a fracture tensor approach for site-scale flow simulations. The upscaled models were evaluated by comparison to in-situ pressure monitoring data, and then used to simulate post-closure hydrogeology for the LILW facility. Simulation results demonstrate the importance of careful characterization and implementation of fractured zones. The study highlighted the importance of reducing uncertainty regarding the properties and variability of natural background fractures, particularly in the immediate vicinity of repository emplacement.

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