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Definition of reference level for exemption of wastes suitable for incineration

Objective

In the frame of studies intended for groups of experts to develop common criteria for exemption of particular waste streams from regulatory control, the project aims to give correlations between waste activity levels and the individual doses due to their incineration.

The approach for establishing radiological protection criteria for the incineration of very low radioactive waste involves:
- The identification of possible waste management scenarios including : sources terms, incinerator data, composition of wastes streams, mode of disposal or reuse of the residues.
- The establishment of dose levels corresponding to incineration of very low radioactive burnable material in a classical installation.
- The establishment for each scenario defined, of environment pathways and dose assessments.

From this work, it will be possible to derive activity concentrations corresponding to acceptable level for incineration without special precaution.
In the frame of studies intended for groups of experts to develop common criteria for exemption of particular waste streams from regulatory control, the project aims to produce correlations between waste activity levels and the individual dosesdue to their incineration.

The approach for establishing radiological protection criteria for the incineration of very low level radioactive waste involves:
the identification of possible waste management scenarios, including sources terms, incinerator data, composition of wastes streams and mode of disposal or reuse of the residues;
the establishment of dose levels corresponding to incineration of very low level radioactive burnable material in a classified installation;
the establishment, for each scenario defined, of environment pathways and dose assessments. It will then be possible to derive activity concentrations corresponding to acceptable level for incineration without special precaution.
Data and base information on incinerator types, processes and working conditions, together with data concerning incineration mechanism, fumes treatment, disposal of dust, bottom ash, and dechlorination residues have been widely compiled. Valorization of bottom ashes has also been considered, and characterization and quantification of radioactive wastes to be incinerated has begun.
Scenarios for release of gas and disposal or valorization of bottom ash have been defined in the frame of incineration of municipal wastes. The generic calculation points out the importance of the partition coefficient (the distribution of the radionuclides between dust, bottom ash and gas). The computer code CERISE has been carried out with the view of assessing, for different situation, the individual doses corresponding to the activity of concerned.
Work programme:

Data Acquisition and Analysis: Data collect and analysis of base information on incinerator types, processes and working conditions and definition of the characteristics of burnable very low level radioactive wastes and expected quantities.

Analysis: Sampling and dust in situ measurement

Evaluation of the radiological impact: Definition of scenarios corresponding to significant pathways for workers and members of public, adaptation of computer code CERISE to specific case of incineration and assessment of individual doses for the workers and radiological impact to the public as a function of quantities, waste activities and incinerator and site characteristics.

Correlation between activity levels and individual doses: individual doses causes by unitary activity concentration of the waste in the considered scenarios, determination of the average activity of the wastes corresponding to the individual dose exemption level and determination of practical limits by group of the nuclides.

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Coordinator

COMMISSARIAT A L'ENERGIE ATOMIQUE
Address
Avenue Du General Leclerc 60-68
92265 Fontenay Aux Roses
France

Participants (1)

EMPRESARIOS AGRUPADOS INTERNACIONAL SA
Spain
Address
3,Magallanes 3
28015 Madrid