Significance of International Cooperative Research on Fission Product Behavior towards Decommissioning of Fukushima Daiichi Nuclear Power Station: Review of the CLADS International Workshop

The severe accident (SA) of Fukushima Daiichi Nuclear Power Plant (1F) has given rise to enlarged research needs for the improvement of the source term assessment, which is based on the description of Fission Products (FPs) behaviour. Fission Product related researches, however, have not been widely conducted in Japan for many years, thus a framework for such research is not so robust. The Collaborative Laboratories for Advanced Decommissioning (CLADS) workshop held in November 2015 was in this frame an important opportunity to gain the state of art knowledge on FP, and to start discussion, between worldwide experts on innovative solution for 1F. This report will describe the FP session conducted in the CLADS workshop and its outcomes. It was pointed out during the workshop that further analyses were needed to properly understand the phenomena that occurred in 1F. The establishment of a Japanese FP platform is here proposed as an effective response to 1F issues, and as a means to coordinate the national research efforts and increase communication between worldwide stakeholders. The FPs studies conduct in this frame will provide important information for the decommissioning of 1F, and will be also of great help for the international community progressing the knowledge on FPs behaviour. Finally they could contribute in establishing improved SA management measures.