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DEFENCE IN DEPTH
Defence in depth: facilities

WHAT SHOULD AFFECT THE RATING?

 

We learned that there were three key aspects:

We would not expect to rate an event where someone nearly received 20 mSv at the same level as one where we nearly lost all cooling to a reactor!

On human performance—training, following procedures, etc.,
and on safety management—maintenance regime, attitude to safety, updating procedures, etc.

Each of these are considered in a defence in depth rating. The first is the main focus of this module as we have already considered the second and third in the overview module.

The next few slides will just remind you how we address the 'how severe' question.