Additional considerations on the levels of Defence in Depth

Among the provisions necessary to ensure the good implementation of defence Level 1, the following ones can be listed [Pg.89]

Level 1 Prevention of abnormal operation and of malfunctions. Conservative design and high quality of construction and of operation. [Pg.90]

Level 2 Control of abnormal operation and detection of malfunctions. Control, limitation and protection systems and other surveillance characteristics. [Pg.90]

Level 3 Control of accidents included in the design basis. Engineered safety systems and accident procedures. [Pg.90]

Level 4 Control of the severe accident conditions of the plant, including the prevention of accident progression and mitigation of consequences. Additional measures and accident management. [Pg.90]

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