.	Safe Design
•	Two approaches
•	Acceptable risks
•	Events accounted
•	Application to these risks
•	Prevention of failures
•	Protection against events
•	Summary
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3.1 Events of internal or external origin

The buildings, systems and equipment are engineered for the events considered in the deterministic approach, i.e.:

• Internal origin events include the following:
  • Incidents and accidents (failure of plant systems)
  • Other events of internal origins such as fire or flooding due to leakage from plant systems.
• External origin events include the following:
  • earthquakes
  • floods
  • aircraft crashes

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