The defenses against hazards are developed proactively partly in parallel:

• First, primary hazards are identified, and operational defenses are designed to mitigate their risks. The outcome of the primary defenses design is resilience add-ons, such as safety means, sensors measuring critical parameters, etc.
• Then, secondary risks are identified, targeting risks about failure of the add-ons, and Blockages are designed, to mitigate the secondary risks.

Updated on 12 Dec 2016.