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Identification of the risk induced by malicious attack on the NPP HMI system   KIM Heeeun1, SON Hanseong2, KIM Jonghyun3, and KANG Hyungook4   1. Department of Nuclear Engineering, Korea Advanced Institute of Science and Technology, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141 ,  Republic of Korea (heeeun.kim@kaist.ac.kr) 2. Department of Game Engineering, Joongbu University, 201 Daehak-ro, Chubu-myeon, Geumsan-gun, Chungnam, 312-702, Republic of Korea (hsson@joongbu.ac.kr) 3. Department of Nuclear Energy Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea (jonghyun.kim@Chosun.ac.kr) 4. Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, United States of America (Kangh6@rpi.edu)    Abstract: The cyber security is one of the important issues in nuclear safety. This study deals with the cyber-attack on the non-safety system of instrumentation and control system, along with the actions of human operator. In this study, the failure of safety functions or safety components were identified from the probabilistic safety assessment result. The failure of safety functions or safety components could be caused by the cyber-attack on the non-safety system. The wrong actions of human operator under the cyber-attack were analyzed based on the emergency operating procedures. The scenarios can be suggested by using those analysis results. The feed and bleed operation is chosen as a target operation. By analyzing those operation steps, we can obtain the list of wrong actions of operator. The type of wrong actions differs from each other according to the step. Keyword: HMI; cyber security;risk Identification; malicious attack
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