off-normal incident or condition at the plant for which no significant
degradation of safety has occurred or is expected. Any releases of
radioactive material which may have occurred or are expected to occur
are minor and constitute no appreciable health hazard. An unusual
event is a minor incident, often non-nuclear, such as a plant worker
injury or severe weather. No public action is required.
event that involves an actual or potential substantial degradation of
safety, combined with a potential for limited uncontrolled releases of
radioactivity from the plant. This is still a relatively minor
incident, and no public action is required.
|Site Area Emergency
event that involves actual or likely major failures of plant functions
needed for protection of the public, combined with a potential for
significant uncontrolled releases of radioactivity. Sirens within the
10-mile emergency planning zone around the plant would sound, alerting
the public to tune to local radio and television stations for official
information. Non-essential plant personnel would evacuate. This
category involves a serious incident, such as a reactor coolant leak
or fire in a safety system.
event involving actual or imminent substantial core degradation and
potential loss of containment integrity combined with a likelihood of
significant uncontrolled releases of radioactivity. This is the most
severe emergency. Sirens within the 10-mile zone would sound, alerting
people to tune to local radio and television stations for official
information. Some public protection measures would be likely.