Operation training for renovated JMTR

JMTR once stopped its operation in August 2006. The subsequent refurbishment and the repair of the building block affected by the 2011 off the Pacific Coast of Tohoku Earthquake on March 11, 2011 have been completed, and it is preparing for the reoperation. As for the refurbishment of reactor facilities, taking into account the operation for further 20 years after the restart, and from the viewpoints of judging standards (aging deterioration of equipment, importance of safety function, and maintenance experience) for the safety ensuring against aging, the following facilities were replaced: (1) core of nuclear reactor body, (2) measurement and control system facilities, (3) reactor cooling system facilities, (4) emergency evacuation equipment of disposal facilities of gaseous waste, and (5) control facilities. In this remodeling, the operation methods for measurement and control system facilities (process instrumentation, nuclear instrumentation) have been changed. Therefore, regarding the reactor operation after the remodeling, examination was made on the methods to safely and reliably conduct important operations such as the criticality proximity of reactor and output increase, while monitoring the process instrumentation in the same way as before. Based on these examination results, the authors designed an operation manual, and have been performing operation training. This paper takes up the methods for reactor operation procedures that were changed by the refurbishment of the reactor, and summarizes the consideration points on the preparation of the operating manual, problems confirmed by practicing the operation training, and measures against those problems. (A.O.)