Experimental methodology to assess migration of iodide ion through Bentonite-Sand Backfill in a Near Surface Disposal Facility

C  Gurumoorthy  and O  Kusakabe

doi:10.17485/ijst/2012/v5i1.13

Article

Experimental methodology to assess migration of iodide ion through Bentonite-Sand Backfill in a Near Surface Disposal Facility

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2012/v5i1.13

Year: 2012, Volume: 5, Issue: 1, Pages: 1-6

Review Article

Experimental methodology to assess migration of iodide ion through Bentonite-Sand Backfill in a Near Surface Disposal Facility

C. Gurumoorthy¹and O. Kusakabe²

¹Safety Research Institute, Atomic Energy Regulatory Board
²Department of Civil Engineering, [email protected]
*Author For Correspondence
C. Gurumoorthy
¹Safety Research Institute, Atomic Energy Regulatory Board
²Department of Civil Engineering,
Email:[email protected]

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

An experimental methodology is presented in this paper to assess the migration of iodide ion (non-radioactive) through saturated Bentonite:Sand (B:S)backfill. Column tests were conducted to study the advective diffusion of iodide ion through different proportions of B:S specimen simulating the stress conditions of Near Surface Disposal Facility (NSDF) for Low level radioactive waste. The diffusion coefficient of iodide ion was found to be in the range of 1.25~4.70×10-10m 2 /sec with steady state hydraulic conductivity 3.31×10-11m/sec. These results suggest centrifuge modeling of iodide migration through B:S to verify self weight stress similitude between prototype and model. Such studies are useful in designing the backfill barrier for NSDF.
Keyword: Radioactive waste; Bentonite-sand backfill; Hydraulic conductivity; diffusion coefficient