JRP 02-08

Partners

EC-JRC-ITU

FZK

NRI-Rez

FZD

Contact

Dr. M. Amme
European Commission - Joint Research Centre - Institute for Transuranium Elements - Hermann-von-Helmholtz-Platz 1 - 76344 Eggenstein-Leopoldshafen - Germany
Phone + 49 (0) 7247 95 1148
E-mail e-mail

Synthesis of actinide endmember solids and solid solutions of relevance for geologic storage

Status

 
Terminated - Planned from February 2005 till August 2006

Goals

The key objectives of this joint research project are:

  • performing the synthesis of pure Np/Pu geologic alteration secondary phases (e.g. Pu- and Np-carbonates, silicates and peroxides, as well as of U(IV) silicates and phosphates);
  • obtaining actinide (Pu/Np) speciation in the solid state;
  • gathering structural information on actinide solid solution systems.

Expected results

During geological storage, actinides contained in spent nuclear fuel (Np, Pu, U) are expected to form solid alteration phases with groundwater anions. However, it is not clear whether discrete compounds or solid-solutions type phases will form. The present joint research project will provide data on expected pure endmember substances, as well as on typical systems containing two actinides, in order to predict these systems. The results will contribute to the investigation of the formation of U and TU carbonates/silicates, depending on the conditions of the repositories (EH, pO2, pH).

Presentations

  • Amme M., Puxley C., "Towards a spectroscopic standard database for Pu in repository environments", 10th International Conference on Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere (Migration'05) 18-23 September 2005/ Avignon, France, 2005. Presentation
  • Amme M., Puxley C., "Synthesen von Actiniden-Festphasen mit Relevanz für Endlagersysteme", German Nuclear Chemistry Society Conference 11-15 September 2005/ Düsseldorf, Germany, 2005. Presentation
  • Amme M., "Formation of peroxo mineral phases in the radiation field of alpha-active nuclear wastes during final geologic storage", 1st International Nuclear Chemistry Congress 22-29 May 2005/ Kusadasi, Turkey, 2005. Presentation

Reports