This document establishes, for nuclear power plants 2 , a method of assignment of the functions specified for the plant into categories according to their importance to safety.Subsequent classification of the I&C and electrical power systems performing or supporting these functions, based on the assigned category, then determines relevant design criteria.
The design criteria, when applied, ensure the achievement of each function in accordance to its importance to safety. In this document, the criteria are those of functionality, reliability,performance, environmental qualification (e.g. seismic) and quality assurance (QA).
