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Conceptual Design of NPPs Cyber Security Test-bed
The cyber-attack on Natanz nuclear facility in Iran which called Stuxnet showed how cyber could affect the physical system. If cyber-attack on NPPs compromise digital I&C system, it may occur some malfunction on actuators and at worst, radioactive material released into the environment. However, it is hard to test the cyber security on operating NPPs because of the safety problems. So, it is necessary to develop a test-bed to test both the cyber security of NPPs and the effect of cyber-attack on NPPs. KINAC has been developing NPPs test-bed to evaluate the cyber security of NPPs, validate cyber security controls of licensee and train the inspectors. In this paper, the conceptual design of NPPs cyber security test-bed will be discussed. Actual I&C systems such as PLC (Programmable Logic Controller) and DCS (Distributed Control System) are essential for testing cyber security. Also, NPPs simulator is one of important part to evaluate or analyze the effect of cyber-attack on NPPs. Usually, NPPs simulator consists of software which contains nuclear model, thermal-hydraulic model, execution program and GUI and hardware which contains workstation, operator console, PC and large display panel. It provides very similar to actual NPPs to users. However, in case of conventional NPPs simulator, I&C part is implemented as a software, so it is impossible to test the cyber security. To solve this issue, in case of the NPPs cyber security test-bed, I&C part should be hardware and simulation code should be modified to connect the hardware I&C part and software simulator using the HIL (Hardware-in-the-loop) method. The main purpose of this NPPs cyber security test-bed is to utilize in NPPs cyber security regulation. So, KINAC is developing the test-bed with APR 1400 simulator model and KNICS PLC and DCS platform. These real hardware I&C system will be connected to hacker’s PC to test cyber security of NPPs. Also, the data set will be updated with real NPPs data set after the test-bed development finished. Furthermore, to give various analysis environment, archiving equipment that archive major plant process data, network packet between I&C systems and the like will be added. This NPPs cyber security test-bed combined the good points of conventional NPPs simulator and cyber security test-bed. It can test the cyber security of NPPs that conventional NPPs simulator cannot do. Also, it can evaluate and analyze the impact of cyber-attack on NPPs that cyber security test-bed cannot do.
