Completion of long term high temperature operation of HTTR (High Temperature Engineering Test Reactor), 5; Operation and maintenance

Shimizu, Atsushi ; Kawamoto, Taiki; Tochio, Daisuke ; Homma, Fumitaka; Sawahata, Hiroaki ; Furusawa, Takayuki 

For the long term high temperature operation with HTTR, issues for systems and components, which were extracted based on result of long term rated operation, were solved. As the result, the followings were confirmed; deviation of temperature, flow rate and pressure of the primary and secondary coolant were sufficiently restricted against the disturbance of temperature of atmosphere during day and night. The whole plant was operated stable. It was confirmed that the secondary coolant was stably supplied. New findings were acquired for the operation and maintenance of systems and components for future HTGR development.