2. What are the different phases of the LOPA method?

The phases of the LOPA method are :

• selecting an accident scenario ;

• assessment of the severity of the consequences associated with the accident scenario ;

• identification of all the initiating events that could lead to the accident scenario ;

• identification of all measures (or layers of protection) to prevent the accident scenario from unfolding;

• evaluation of the frequency of initiating events ;

• evaluation of the stress failure probabilities allocated to the various measures ;

• assessment of the frequency of occurrence of the accident scenario, taking into account the reduction factor linked to the measures implemented (residual frequency);...