Regional Basic Professional Training Course in Korea

Regional Basic Professional Training Course (BPTC) on Nuclear Safety
6.2.2. Classification sequence
The following sequential process is used for classification:
Determination of the functions to be performed by each of the systems concerned
(main system and support systems) under all operating conditions considered to be
plausible (design basis operating conditions and complementary operating conditions);
then a list is drawn up of the equipment involved in accomplishing the functions and
which therefore must be either safety grade or safety‐related, but non‐safety grade.
For each item of equipment listed, determination of its class, on which certain of
the following design requirements depend:
− redundancy and independence;
− electrical power back‐up;
− qualification for accident conditions;
− subject to a design and construction code;
− seismic grade;
− quality assurance requirements;
− as well as an operability requirement (periodic tests).
For particularly complex equipment, the classification is carried out at the level of its
components (e.g. for the diesel generators).
6.2.3. Example of safety‐related but non‐safety grade equipment
The safety‐related but non‐safety grade equipment comprises:
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