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Defence in depth: reactors

Defence in depth RATING TABLES


So now that we understand about safety function operability and initiator frequency, we can see how the rating is derived from this information.

There are two tables in the Manual;

  • One applies where there was an initiator, and
  • One applies where there was not.

Let's start with the table for events where there was no initiator (please continue for further explanation of the tables)