In the nuclear industry, regulatory guidelines of cyber security have focused on managingauditory records and blocking physical access. Most of the research in the nuclear cyber securityfield also has proposed technology applications. However, the possibility of operator’s wrongactions caused by cyber-attack has not been considered yet. Although MCR (Main Control Room)operators should play critical roles in response to cyber-attack, the operator factor has been regardedas an unimportant factor. Operator’s roles and tasks are even not defined specifically during cyberattacks. In order to help operators to comprehend the cyber-attacked situation and to respondeffectively, this study analyzes which information should be given to MCR operators and how theinformation should be provided. In addition, based on results of the analysis, basic design conceptsof cyber-SA support system are suggested.
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