Development of a method for estimating security state: Supporting integrated response to cyber-attacks in NPPs

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Nuclear regulatory guidelines require all nuclear facilities to establish sufficient prevention and response capabilities against cyber-attacks. In this study, an integrated cyber-attack response process at NPPs is analyzed. The integrated response process includes a safety-response security analysis that enacts a safety response against unperceived damage, as well as against potential damage. To help operators conduct the safety-related security analysis, a security state estimation method is developed. A knowledgebased hidden Markov modeling method is developed to model a probabilistic transition process of a security state. The constructed HMMs can be updated online for optimized security state estimation. The developed security state estimation method can help operators conduct a cause analysis and security impact analysis. By integrating with the probabilistic safety assessment method, the developed method can also be applied to a functional impact analysis. A case study was conducted to prove the validity of the developed method using a hardware-in-the-loop system. (C) 2021 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2021-08
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.158

ISSN
0306-4549
DOI
10.1016/j.anucene.2021.108287
URI
http://hdl.handle.net/10203/285563
Appears in Collection
NE-Journal Papers(저널논문)
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