Improving security in the operation of nuclear power plants using Defence in Depth principle

This paper presents a study on the impact of using Defence-in-Depth principle to improve security in operation of the nuclear power plants. The simulation results showed that the use of characteristics to ensure the layers of Defence in Depth, such as redundancy, in the design of the Auxiliary Power Supply System, increased the reliability of the system by up to 26.7%. The results suggest that the Defence in Depth principle is effective in improving the security and reliability of power plant systems and equipment. This study provides a framework for future evaluations of other Defence in Depth characteristics on the reliability of power plants systems and equipment.