Implementation of cyber security for safety systems of nuclear facilities

• We suggested an implementation method of cyber security for safety systems.
• The method provided a system V&V framework including security activities.
• The implementation results in a nuclear construction project were presented.
• The method helps system developers to implement cyber security for safety system.

Digital computers have been chosen as a safety system in newly constructed nuclear facilities. Owing to digitalization, cyber threats to nuclear facilities have increased and the integrity of the digital safety systems has been threatened. To cope with such threats, the nuclear regulatory agency has published guidelines for digital safety systems. This paper suggests an implementation method of cyber security for the safety system in the development phase. It introduces specific security activities based on a practice in a nuclear facility construction project. It also explains experiences resolving security vulnerabilities of the system and gives lessons learned about considerations in a real construction.