Gateway for:

Member Countries

Thermal Decontamination Technology

#1148


Development of Technology for Cleaning Radionuclide-Contaminated Noncombustible Surface with the Use of Exothermic Metallic Mixtures with Adsorption- Thermal Action

Tech Area / Field

  • ENV-RED/Remediation and Decontamination/Environment
  • ENV-RWT/Radioactive Waste Treatment/Environment

Status
3 Approved without Funding

Registration date
12.11.1997

Leading Institute
NPO Radon (2), Russia, Moscow

Project summary

The main objective of the project is the development of the technology of radionuclide contaminated noncombustible surface cleaning by the use of the exothermic metallic mixtures (EMM) with contact adsorptive-thermal action.

The qualified scientists and engineers who previously dealt with problems associated with uranium mining technology and nuclear testing performance will participate in the realization of the project. The scientists and engineers worked at the development of the weapons facilities will be involved in the execution of the project as well.

In the course of the researches work on the establishment of optimal compositions of EMM with contact adsorptive-thermal action permitting the efficient cleaning of the radioactive contaminant from concrete, metallic and asphalt surfaces will be conducted.

The heat-sorption methods of surface (metal, concrete, asphalt) decontamination are founded on the contact heat-up of contaminated surfaces using the EMM. During the flameless combustion of the EMM applied to the surface being decontaminated the temperature increases from 300 to 1200°C and over (depending on the mixture composition) within 10-20 minutes. At the expense of that radionuclides are desorbed from the surface and adsorbed into the upper colder layer of EMM combustion products that is slag. Slag has a porous structure with highly developed surface capable of uptaking the desorbed radionuclides. On cooling of slag it is removed by mechanical means along with the contaminant.

The technology of surface cleaning by the use of above-mentioned mixtures will be developed. For the purpose of decontamination effort the prototype of decontamination facility including the gas- and aerosol- purification unit as well as the unit of mechanical removal of decontamination products will be constructed.

The implementation of this technology will make possible the volume reduction of second waste derived from surface decontamination and decreasing of energy consumption for carrying out the decontamination because for surface heating up and carrying out the processes of radionuclide desorption from this surface the high-metallic combustible mixtures which are independent heat energy sources are used. The resulting from mixture combustion slag with highly developed surface has the property of sorbing into itself radionuclides removed from the surface due to its heating up.

The method enables the contaminated concrete and asphalt layers to be removed at a required depth. By this means the method provides required removal coefficient for the processable surfaces.

Successful implementing of the project will make it possible:


- to expand the fields of EMM application for peaceful uses in an effort to decontaminate and rehabilitate the contaminated territories and to decontaminate the surfaces of various contaminated materials;
- to develop the highly efficient method of cleaning of radionuclide contaminant from various noncombustible surfaces;
- to construct the compact decontamination facility for cleanup of concrete, asphalt and metallic surfaces;
- to enhance significantly the ecological safety of the process of surface decontamination through thermosorption.

Works are scheduled to conduct for two years.

In the course of the first year EMM compositions will be optimized to fit the nature of the surface being decontaminated and the depth of its contamination. The methods of EMM application for cleanup of surfaces will be well-proven as well.

During the second year the prototype of decontamination facility capable of efficient cleaning of radionuclide contaminant from noncombustible surfaces by the use of independent heat sources (EMM) will be constructed.

During the realization of the project the techniques and actual operating experience of SIA "Radon" specialists in the field of producing of combustible metallic mixtures for different purposes, examination of aerosol entertainment in the thermal treatment of radioactive waste, its ecological safety assessment as well as in the field of development of multipurpose facilities will be exploited.


Back