Construction of the Transmutation Experimental Facility (TEF) is planned within the framework of J-PARC (Japan Proton Accelerator Research Complex) project. The facility has a critical assembly and a lead-bismuth target connected to a 600 MeV proton beam line. Considering the current J-PARC schedule, we are planning to install the critical assembly with a 30kW beam dump at the first phase and the target facility will be built at the latter phase. Based on this construction plan, JAEA collected the preliminary Letters Of Intent (LOI) for TEF. More than 30 research programs by about one hundred researchers were proposed from all over the world. The proposals spread over wide research fields such as innovative reactor concepts including ADS and FBR, nuclear data, nuclear physics, and so on. A medical application using 30kW dump was also proposed. According to these many valuable proposals, the re-arrangement of facility layout and the new experimental equipment design are now underway. One of the important R&Ds is to prepare for the application of minor actinide fuels to critical assembly. The development of the technology to handle the high-background minor actinide fuel is being performed. A sensitivity analysis was also performed to determine the efficient fuel composition.
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