Undermoderated spectrum MOX core study. Advanced fuel recycle by BWR

The concept of BARS (BWR with Advanced Recycle System) is described. This system is to recycle fuel for breeding type BWR using spent fuel by the dry reprocessing. At present, it is studying about the high spectrum core cooling with light water, the dry reprocessing, Vibration Compaction fuel and so on. In the dry reprocessing method used oxide, RE and DF are one of the technical issues. In the case that DF is about 10, RE doesn't influence a core behavior. According to improve the present process, the possibility lies in making DF from 5 to equal or more than 10 sufficiently. Here, the outline, the development situation of these studies and the prospect of BARS from ability are explained. (author)