Icone23-1525 Accomplishment of Jt-60u Disassembly Work Dealing With Radioactive Components

Abstract

The upgrade of the JT-60U to the superconducting tokamak "JT-60SA" has been carried out to contribute the early realization of fusion energy by addressing key physics issues relevant for ITER and DEMO. Disassembly of t he JT-60U tokamak was requ ired so as to newly in stall the JT-60SA torus at th e same position in the toru s hall. The JT-60U tokamak was featured by the complicated and welded structure against the strong electromagnetic force, and by the radioactivation due to deuterium-deuterium (D-D) reactions of 1.5x10 20 (n) in to tal. Since this work was the first experience of disassembling a large radioactivated fusion device in Japan, careful preparations of disassembly activities, including treatment of the radioactivated materials and safety work, have been made. About 13,000 components with a total weight of more than 5,400 tonnes were removed from the torus hall and stored safely in storage facilities. All disassembly components were stored with recording the data such as dose rate, weight and kind of material, so as to apply the clearance level regulation in future. It was confirmed that the main radioactive material of the disassembly components was the stainless steel a nd that its dose rate was almost background level (~0.1 Sv/h) at ~10m far from the vacuum vessel. It seems that the disassembly components with background dose level are in the clearance level. T he assembly of JT-60SA tokamak has started in January 2013 after this disassembly of the JT-60U tokamak.