Average NPP operating period (months) ——— Average NPP outage (months)

1 Period of time between the initial connection of a reactor to the grid and shutdown for outage (excluding shutdowns for reasons other than outage).
2 Period of time between shutdown for outage and when the reactor is reconnected to the grid (excluding outages lasting 800 days or more).
3 Refueling time.

Japan1 USA Japan2 USA3
1990 12.4 14.2 4.6 3.1
1995 13.1 15.5 3.2 2.1
2000 13.5 17.5 2.9 1.4
2005 12.4 18.9 4.2 1.3