Graph illustrating automatic scrams per reactor between 1989 and 2001. Graph starts high in 1989 at just under 2.5 then drops slowly floating between 2.0 and 1.0 from 1990 to 1995, and between 1.0 and 0.5 from 1996 to 2001.
Note: A scram is a basic reactor protection safety function that shuts down the reactor by inserting control rods into the reactor core. Scrams can result from events that range from relatively minor incidents or human errors to precursors of accidents. The number of scrams declined steadily since 1988.