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DEFENCE IN DEPTH
Defence in depth: reactors

METHODOLOGY FOR REACTORS AT POWER

 

As the first question is answered, rating events for reactors at power follows the steps shown here. 

What safety provisions have been affected?

The basic rating depends on assessing the status of safety provisions in the plant.
- It is about initiators and safety functions

The wider issues are; human performance and safety management.

Additional factors are about the wider safety management issues, depending mainly on failures of personnel and procedures.

A 'basic rating' is assessed from the first step and a 'final rating' is derived from considering the additional factors. Additional factors were explained in the overview module.