Jun, 1972	Establishment
Apr, 1974	Training with the initial simulator began.
Dec, 1980	Operating test for the shift manager license began.
Mar, 1984	Training with the No. 2 simulator began.
Mar, 1990	Training with the No. 3 simulator began.
Mar, 1997	Training with the No. 1 simulator began.
Mar, 2002	Shift manager qualification examinations began.
Nov, 2008	Training with the No. 4 simulator began.