4.0. Layer of Protection Analysis
LOPA is based on the assessment of a single event, and the associated consequence scenarios. LOPA is a rather simplified form of quantitative hazard analysis technique normally applied for the cases where the system is too complex or the consequence too severe to be handled by HAZOP. As a matter of fact, it is a quantitative analysis technique, but lying almost at the lower edge of quantity analysis technological scale. It is in between HAZOP and QRA. This is shown in Fig. V/4.0-1B. At times, it takes input from HAZOP and its output could be used as input to QRA.
Conceptually, it analyzes the hazard events, then offers a number of independent protection layers (see Fig. II/4.3.7-1) so that risk frequency is reduced ...
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