Recent progress in the investigation of inert matrix fuel

The status and recent progress of the research works on the so-called Inert Matrix fuel concept for the utilization as energy resources and the incineration of excess Pu arisings as well as for an effective transmutation of minor actinides (MAs; Am, Np and Cm) and long-lived fission products (LLFPs) are reviewed in view of the materials science. Stabilized cubic phase ZrO2, magnesium spinel (MgAl2O4) and other potential candidate materials for the Inert Matrix are compared in terms of the material properties and other particular aspects such as the behavior against irradiation, with the relevant information currently available. Strategies for the use of the Inert Matrix Fuel concept in various countries are also discussed and compared for their options in nuclear fuel cycle technology. (author)