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Treatment Study of Contaminated Sodium with a View to Decommissioning of FBR

Objective

In the Fast Breeder Reactor (FBR) decommissioning studies, sodium arrangement is a major problem. Sodium becomes an important waste which must be taken into account in the final process. To handle this specific topic, a cooperative working group has been formed, with CEA, FRAMATOME and SIEMENS. CEA is the project leader. The scope of work is based on a step by step approach, using available data and experimental results with regard to the sodium inventory, sodium purification and waste treatment. The aim of this particular development program is to highlight optimized scenarios for sodium destruction and recycling, based on a technical and an economical approach. Moreover a Research & Development (R&D) orientation will be provided to improve the selected scenario and to allow a better understanding of fundamental processes.
In the fast breeder reactor (FBR) decommissioning studies, sodium becomes an important waste which must be taken into account in the final process. To handle this specific topic, a cooperative working group has been formed, with the Commissariat a l'Energie Atomique (CEA) and Framatome, and Interatom GmbH. Commissariat a l'Energie Atomique. The scope of work is based on a step by step approach, using available data and experimental results with regard to the sodium inventory, sodium purification and waste treatment. The aim of this particular development programme is to propose an optimized scenario for sodium destruction or recycling, employing a technical and an economic point of view. Moreover a research and development orientation will be provided to improve the selected scenario and to allow a better understanding of fundamental processes.

The sodium balance, based on sodium needs for future FBR programmes and existing wastes to be treated, is the starting point from which the problem is tackled and from which the scenarios to be proposed later on are set. From an estimated contamination, provided by mathematical models which have been validated using experimental data, it is possible to predict the behaviour and characteristics of the sodium to be treated. Purification processes are examined with regard to the predicted quantities of contaminated sodium and the associated storage and transportation techniques. The research and development axes are defined, according to the required level of knowledge in the waste treatment domain. Using the previous steps as a reference, main scenarios are reviewed, with both a technical and an economic vision. This twofold approach allows the working group to select the scenarios to be analyzed. These processes, having been defined as suitable scenarios for sodium treatment, will be described. Further needs for research and development programs will be highlighted, to improve the efficiency of the processes.
Work programme:

To perform the above scope of work, five main stages have been defined:

- Inventory of the sodium needs: the sodium balance, based on sodium needs for future FBR programs and existing wastes to be treated, is the starting point from which the problem is tackled and from which the scenarios to be highlighted later on are set.
- Assessment of sodium behaviour and characteristics: from an estimated contamination, provided by mathematical models which have been validated using experimental data, it is possible to predict the behaviour and characteristics of the sodium to be treated.
- Sodium purification: purification processes are examined with regard to the predicted quantities of contaminated sodium and the associated storage and transportation techniques. The R&D axes are defined, according to the required level of knowledge in the waste treatment domain.
- Analysis of the scenarios and their main parameters: using the previous steps as a reference, the main parameters of the scenarios are reviewed, with both a technical and an economical vision. This twofold approach allows the working group to highlight arguments to select and describe the scenarios to be analyzed.
- Optimized scenarios: these processes, having been defined as suitable scenarios for sodium treatment, will be described. Further needs for R&D programs will be highlighted, to improve the processes efficiency.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Commissariat à l'Energie Atomique (CEA)
Address
Centre D'études De Cadarache Sere-ders
13108 Saint-paul-lez-durance
France

Participants (2)

FRAMATOME ANP
France
Address
Rue Juliette De Recamier 10
69456 Lyon
Siemens AG
Germany
Address

51425 Bergisch-gladbach