In 2005, the breakdown of incidents according to the safety function affected was appreciably the same as in previous years. The ASN did however observe a rise in the number of "support" function incidents, a trend which should be monitored and confirmed next year.

Safety incidents are also broken down according to the reactor state: some occurred while the reactor was in power operations, while others occurred during outages. The occurrence of certain incidents is independent of the reactor state and they are placed under the "Independent" heading.

The following graph shows this breakdown for EDF reactor incidents in 2005.

This graph shows that the number of safety incidents is higher when the reactor is in power operations than during an outage. The proportions remain similar to those obtained for 2004.

Breakdown of incidents on EDF reactors in 2005, according to the main cause

If we consider all the incidents which occurred on EDF reactors in 2005, independently of the area of declaration, the proportion of incidents linked to organisational and human causes is tending to rise, and went up from 75% in 2002 to 80% in 2005.