Maintenance activity of prototype FBR Monju

The sodium leak accident in a secondary main cooling system of prototype fast breeder reactor (FBR) Monju was occurred on December 8th in 1995 and the Monju has shut down since that. After the establishment of public acceptance, improvement of operational procedure, countermeasures to sodium leakage, Monju restarted on May 6th 2010. The integrity confirmation of water and steam, turbine system is underway toward the 40% rated power confirmation test which confirm the whole plant performance. FBR can breed fuel and use minor actinide in the radioactive waste as a fuel, so that reduce environmental burden. Monju play a key role in the development of demonstration reactor in the aspects of demonstration of reliable operability and establishment of operation and maintenance method of FBR. In this paper describes the activities towards the establishment of Monju maintenance program and FBR maintenance method. (author)