A Preliminary Study on the Transport Behavior for a Potential Disposal Site of LILW in Southern China

Abstract:

Article Preview

Near surface disposal of low and intermediate level radioactive waste (LILW) requires a detailed site investigation of the potential sites, in which the transport behavior of solutes in the groundwater system is one of the key processes that needed to be addressed. An investigation is undertaking for the disposal of LILW at a potential site in Southern China. In-situ test have been conducted to study the hydrogeologic characteristics of the site. Firstly, tests including pit permeability tests, injecting tests, water pressure tests, pumping tests and laboratory permeability tests have been performed according to the specific field conditions. Hydraulic conductivities for different layers of rock and soils have been calculated and their recommended values have been presented. And then in-situ dispersion tests have been performed at an area adjacent to the disposal site with non-sorbed tracers. A numerical model has been developed for the site based on data obtained during the site investigation, and has been calibrated with available measured groundwater level and measured tracer concentrations in the dispersion tests. Calibrated results indicate that the longitudinal dispersion coefficient is equal to 5.0×10-3 m2/d. Preliminary predictions have been performed for the groundwater flow and solute advection-dispersion behavior according to the design of the site, in which the center valley will be backfilled with low permeable materials. Predicted results indicate that the groundwater exhibits a lower water table and a smaller hydraulic gradient under designed site condition than under natural condition. All the tracers remain underground in the site and transport slowly mainly through advection and dispersion. Finally, conclusions for the study have been presented and the key tasks for future work have been discussed. This study provides an insight understanding of the hydrogeology characteristics of the disposal site and is useful for the assessment of environment impacts of the site under disposal of LILW.

Info:

Periodical:

Advanced Materials Research (Volumes 356-360)

Edited by:

Hexing Li, Qunjie Xu and Daquan Zhang

Pages:

1445-1453

DOI:

10.4028/www.scientific.net/AMR.356-360.1445

Citation:

S. P. Yi et al., "A Preliminary Study on the Transport Behavior for a Potential Disposal Site of LILW in Southern China", Advanced Materials Research, Vols. 356-360, pp. 1445-1453, 2012

Online since:

October 2011

Export:

Price:

$35.00

[1] Sun, X. and Fei, H., Advances in the disposal of low and intermediate level radioactive waste in China (in Chinese), China Academic Journal Electronic Publishing House. 2007, pp.1994-2007, http: /www. cnki. net , 6-9.

[2] Wang J., Disposal of the disposal of HLW in China, IAEA Training Course on Geological Disposal, 30 Nov. - 5 Dec., 2009, Beijing, China.

[3] INTERNATIONAL ATOMIC ENERGY AGENCY. Siting of near surface disposal facilities. Safety Series No. 111-G-3. 1, IAEA, Vienna, 1994, p.23.

[4] Han, K., Heinonen, W. J., and Bonne, A., Radioactive Waste Disposal:Global Experience and Challenges. IAEA Bulletin. 39(1), 1997, p.33.

[5] Liu P., Guan, T. and Wang, Y., Journal of East China Geological Institute (in Chinese). 23(3) , 2000, pp.229-234.

[6] Kittel, J. H., NEAR-SURFACE LAND DISPOSAL, Radioactive Waste Management Handbook (Volume 1). Harwood Academic Publishers, Chur·London·Paris·New York·Melbourne, 1989, p.440.

[7] Li, X., Li, Zh., Li, C. et al., Report of the preliminary feasibility study on the disposal of low and intermediate level solid radioactive waste in Shaoguan (in Chinese). CGN, Nov., 2009, p.255.

[8] Tison J. L., 40 years of operation of Near Surface Repositories. Andra Experience. 2009 CEG WORKSHOP, Feb. 24-26, 2009, Bommersvik, p.36.

[9] Min, W., Report for the geological investigation and active faults identification near Yaotian area for disposal of low and intermediate level solid radioactive waste (in Chinese). FSDZJ, Jun., 2010, p.90.

[10] Li, X., Zhang, J., Report on the geotechnical engineering investigation for disposal of low and intermediate level radioactive waste in the Yaotian site: feasibility study stage (in Chinese). Guangdong Electric Power Design Institute, Sep., 2010, p.95.

[11] Li, X., Yi, S., Ma, H. et al., submitted to Engineering Investigation (in Chinese), 2010, p.5.

[12] Zheng, C., and G.D. Bennett, Applied Contaminant Transport Modeling Second Edition, John Wiley & Sons, New York, 2002, p.621.

[13] Zheng, C. and Wang, P. P., MT3DMS:A Modular Three-Dimensional Multi-Species Model for Simulation of Advection. Dispersion and Chemical Reactions of Contaminants in Groundwater Systems: Documentation and User's Guide, SERDP-99-1,U.S. Army Engineer Research and Development Center, Vicksburg, MS, (1999).

[14] Zheng, C. MT3DMS v5. 2 Supplemental User's Manual, Dep. Of Geol. Sci., Univ. of Alabama. Zheng, C. 2009. Ground Water . 5(47), 2002, p.620–625.

[15] McDonald, M.G., and A.W. Harbaugh. A modular threedimensional finite-difference ground-water flow model. U.S. Geological Survey Techniques of Water-Resources Investigations, book 6, chap. A1. Reston, Virginia: USGS, (1988).

[16] Harbaugh, A.W., E.R. Banta, M.C. Hill, and M.G. McDonald. MODFLOW-2000, the U.S. Geological Survey modular ground-water model—User guide to modularization concepts and the ground-water flow processes. U.S. Geological Survey Open-File Report 00-92, 121. Reston, Virginia: USGS, (2000).

DOI: 10.3133/1466

[17] Harbaugh, A.W., MODFLOW-2005, the U.S. Geological Survey modular ground-water model—the ground-water flow process. U.S. Geological Survey Techniques and Methods 6-A16. Reston, Virginia: USGS, (2005).

[18] Prommer H, D.A. Barry, and C. Zheng, Ground Water. 2(41), 2006, p.247–257.

[19] Ma, R., C. Zheng, H. Prommer, J. Greskowiak, C. Liu, J. Zachara, M. Rockhold. Water Resour. Res. 46, 2010, W05509, doi: 10. 1029/2009WR008168.

In order to see related information, you need to Login.