Two IAEA expert missions on characterization of irradiated graphite (hereinafter: iGraphite) and on waste form determination procedures are being held at ChNPP from 27 to 31 May 2019 as part of the national technical cooperation project.
Both topics are extremely important for ChNPP. The problem of characterization of iGraphite is closely connected with plant's decommissioning progress which stipulates management of iGraphite packages to be obtained as a result of fuel channels and control and protection system rods management scheduled to be started in 2021. The management process of iGraphite packages is identical to those of long-lived radioactive waste (RAW), stipulating that for further management, the packages should be characterized as for the nuclide content, which requires the relevant methodology to be developed and approved.
This expert mission is not the first one held in this direction. In June 2017, IAEA experts were reviewing the ChNPP technical solution on iGraphite management and found the results of the previously performed characterization of graphite rings of five fuel channels of ChNPP Reactor 2 acceptable as the basis for graphite characterization. However, for this purpose it is necessary to develop and describe the relevant methodology for characterization of packages.