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The TRANSCEND University Consortium: Site decommissioning, deconstruction and remediation

The TRANSCEND University Consortium: Site decommissioning, deconstruction and remediation
The TRANSCEND University Consortium: Site decommissioning, deconstruction and remediation
This paper will discuss the aims, objectives and progress to-date under Theme 2 of the TRANSCEND consortium project: Site decommissioning, deconstruction and remediation. Decommissioning nuclear sites involves waste retrieval, decontamination, deconstruction and, where necessary, containment and/or remediation of the remaining structure and surrounding land. Critical to management of these processes is limiting radiation exposure for the workforce, restricting the spread of radionuclides in groundwater, surface water and airborne particulates, and minimising the volume of contaminated waste for disposal. The aim of Theme 2 research is to develop new technologies for monitoring, remediation and containment that serve to minimise the volume of radioactively contaminated waste for disposal, for application prior to, during and after retrieval, deconstruction and decontamination operations.
Prior research, conducted under the previous DISTINCTIVE project, demonstrated that colloidal silica grout can penetrate low permeability materials (including cement) for hydraulic barrier formation, and improved sorption capacity. The silica grout can be injected at surface using extremely small (potentially gravity-driven) fluid pressures, without the need for borehole drilling. Current work is investigating the erodibility of silica-grouted soils for inhibition of airborne and water-borne particulates as well as enhancing the grout’s sorption capacity by addition of other materials to provide a chemical, as well as hydraulic, barrier to subsurface migration.
EK remediation uses low voltage DC current to control migration of contaminants in porous media as well as to remove or degrade them. Researchers in the consortium have already demonstrated that low-energy ex-situ EK techniques can be used to provide remediation and volume minimisation for AWE legacy wastes in the UK. Under the current project researchers are building EK test cells containing simulated site materials at laboratory and intermediate(m)-scales to: remove, focus or degrade contaminants (remediation or waste minimisation); and direct subsurface water, chemical and colloid flow (fencing/containment or forced migration). This lab-based research is being informed by numerical models of EK processes that can subsequently be used to design full-scale on-site applications by nuclear site holders.
Research under theme 2 of TRANSCEND will ultimately combine novel non-invasive detection technologies with EK techniques and colloidal silica grout barriers, to optimise the containment of radionuclide contamination in soils. Thus, allowing us to detect in-situ contamination, mobilise it to a selected location and grout it in-situ, prior to the initiation of decommissioning and deconstruction operations.
Lunn, R.J.
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Cundy, Andrew
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Pedrotti, M.
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Purkis, Jamie M.
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Pegano, A.
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Renshaw, J.
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Karampourniotisa, A.
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Lee-Brewin, L.
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Read, D.
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Elisio, S.
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Joyce, M.
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Van de Perre, L.
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Lunn, R.J.
5b90d419-edac-42af-b860-fedcd7e1b448
Cundy, Andrew
994fdc96-2dce-40f4-b74b-dc638286eb08
Pedrotti, M.
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Purkis, Jamie M.
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Pegano, A.
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Renshaw, J.
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Karampourniotisa, A.
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Lee-Brewin, L.
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Read, D.
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Elisio, S.
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Joyce, M.
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Van de Perre, L.
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Lunn, R.J., Cundy, Andrew, Pedrotti, M., Purkis, Jamie M., Pegano, A., Renshaw, J., Karampourniotisa, A., Lee-Brewin, L., Read, D., Elisio, S., Joyce, M. and Van de Perre, L. (2019) The TRANSCEND University Consortium: Site decommissioning, deconstruction and remediation. WM2020 Symposia: 46th annual Waste Management Symposium, Phoenix Convention Center, Phoenix, United States. 08 - 12 Mar 2020. 13 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper will discuss the aims, objectives and progress to-date under Theme 2 of the TRANSCEND consortium project: Site decommissioning, deconstruction and remediation. Decommissioning nuclear sites involves waste retrieval, decontamination, deconstruction and, where necessary, containment and/or remediation of the remaining structure and surrounding land. Critical to management of these processes is limiting radiation exposure for the workforce, restricting the spread of radionuclides in groundwater, surface water and airborne particulates, and minimising the volume of contaminated waste for disposal. The aim of Theme 2 research is to develop new technologies for monitoring, remediation and containment that serve to minimise the volume of radioactively contaminated waste for disposal, for application prior to, during and after retrieval, deconstruction and decontamination operations.
Prior research, conducted under the previous DISTINCTIVE project, demonstrated that colloidal silica grout can penetrate low permeability materials (including cement) for hydraulic barrier formation, and improved sorption capacity. The silica grout can be injected at surface using extremely small (potentially gravity-driven) fluid pressures, without the need for borehole drilling. Current work is investigating the erodibility of silica-grouted soils for inhibition of airborne and water-borne particulates as well as enhancing the grout’s sorption capacity by addition of other materials to provide a chemical, as well as hydraulic, barrier to subsurface migration.
EK remediation uses low voltage DC current to control migration of contaminants in porous media as well as to remove or degrade them. Researchers in the consortium have already demonstrated that low-energy ex-situ EK techniques can be used to provide remediation and volume minimisation for AWE legacy wastes in the UK. Under the current project researchers are building EK test cells containing simulated site materials at laboratory and intermediate(m)-scales to: remove, focus or degrade contaminants (remediation or waste minimisation); and direct subsurface water, chemical and colloid flow (fencing/containment or forced migration). This lab-based research is being informed by numerical models of EK processes that can subsequently be used to design full-scale on-site applications by nuclear site holders.
Research under theme 2 of TRANSCEND will ultimately combine novel non-invasive detection technologies with EK techniques and colloidal silica grout barriers, to optimise the containment of radionuclide contamination in soils. Thus, allowing us to detect in-situ contamination, mobilise it to a selected location and grout it in-situ, prior to the initiation of decommissioning and deconstruction operations.

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More information

Published date: 8 March 2019
Venue - Dates: WM2020 Symposia: 46th annual Waste Management Symposium, Phoenix Convention Center, Phoenix, United States, 2020-03-08 - 2020-03-12

Identifiers

Local EPrints ID: 435929
URI: http://eprints.soton.ac.uk/id/eprint/435929
PURE UUID: 02ffd7af-26be-4e15-8b6f-0c503bf7bc75
ORCID for Andrew Cundy: ORCID iD orcid.org/0000-0003-4368-2569
ORCID for Jamie M. Purkis: ORCID iD orcid.org/0000-0002-6387-1220

Catalogue record

Date deposited: 25 Nov 2019 17:30
Last modified: 22 Nov 2021 03:25

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Contributors

Author: R.J. Lunn
Author: Andrew Cundy ORCID iD
Author: M. Pedrotti
Author: Jamie M. Purkis ORCID iD
Author: A. Pegano
Author: J. Renshaw
Author: A. Karampourniotisa
Author: L. Lee-Brewin
Author: D. Read
Author: S. Elisio
Author: M. Joyce
Author: L. Van de Perre

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