None or insignificant structural damage (damage ratio: 0 - 0.05%).

Possible movement of equipment; no damage to piping (damage ratio: 0.05 - 1.25%).

Failure of some connected piping; equipment displacement with some internal damage; moderate chance of realease of reactants (damage ratio: 1.25 - 20%).

Failure of most piping connections; equipment damaged; almost certain release of reactants (damage ratio: 20 - 65%).

Failure of all piping connections; equipment damaged; reactants released (damage ratio: 65 - 100%).