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DEFENCE IN DEPTH
Defence in depth: reactors

THE TWO TYPES OF EVENTS

 

Here you have an important summary of the last two pages. An important part of the methodology is to recognize which type of event has occurred. Too often people jump into the detail of the methodology without having sorted out in their mind exactly what has occurred.

  • An initiator occurs - one or more safety functions are challenged
  • e.g. loss of off-site power, LOCA
  • No initiator occurs but one or more safety functions are found degraded
  • e.g. safety injection pumps found isolated