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A possible accident scenario starting with a gas leak in a process plant may proceed as follows:

1 (1) A gas leak from flange A occurs (i.e. the initiating event).

2 (2) The gas is detected.

3 (3) An alarm is triggered.

4 (4) The process shutdown system fails to shut off the gas flow to the flange.

5 (5) The gas is ignited and a fire occurs.

6 (6) The firefighting system is activated.

7 (7) The fire is extinguished within approximately one hour.

8 (8) One person is injured by the fire.

Accident scenarios are identified and described as part of a risk analysis, but this does not mean that they will indeed occur. For events that have actually occurred, the term accident or accident course is more appropriate.