• Title/Summary/Keyword: nuclear facilities

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Cyber Security Risk Evaluation of a Nuclear I&C Using BN and ET

  • Shin, Jinsoo;Son, Hanseong;Heo, Gyunyoung
    • Nuclear Engineering and Technology
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    • v.49 no.3
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    • pp.517-524
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    • 2017

  • Cyber security is an important issue in the field of nuclear engineering because nuclear facilities use digital equipment and digital systems that can lead to serious hazards in the event of an accident. Regulatory agencies worldwide have announced guidelines for cyber security related to nuclear issues, including U.S. NRC Regulatory Guide 5.71. It is important to evaluate cyber security risk in accordance with these regulatory guides. In this study, we propose a cyber security risk evaluation model for nuclear instrumentation and control systems using a Bayesian network and event trees. As it is difficult to perform penetration tests on the systems, the evaluation model can inform research on cyber threats to cyber security systems for nuclear facilities through the use of prior and posterior information and backpropagation calculations. Furthermore, we suggest a methodology for the application of analytical results from the Bayesian network model to an event tree model, which is a probabilistic safety assessment method. The proposed method will provide insight into safety and cyber security risks.

  • https://doi.org/10.1016/j.net.2016.11.004 인용 PDF KSCI

A practical challenge-response authentication mechanism for a Programmable Logic Controller control system with one-time password in nuclear power plants

  • Son, JunYoung;Noh, Sangkyun;Choi, JongGyun;Yoon, Hyunsoo
    • Nuclear Engineering and Technology
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    • v.51 no.7
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    • pp.1791-1798
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    • 2019

  • Instrumentation and Control (I&C) systems of nuclear power plants (NPPs) have been continuously digitalized. These systems have a critical role in the operation of nuclear facilities by functioning as the brain of NPPs. In recent years, as cyber security threats to NPP systems have increased, regulatory and policy-related organizations around the world, including the International Atomic Energy Agency (IAEA), Nuclear Regulatory Commission (NRC) and Korea Institute of Nuclear Nonproliferation and Control (KINAC), have emphasized the importance of nuclear cyber security by publishing cyber security guidelines and recommending cyber security requirements for NPP facilities. As described in NRC Regulatory Guide (Reg) 5.71 and KINAC RS015, challenge response authentication should be applied to the critical digital I&C system of NPPs to satisfy the cyber security requirements. There have been no cases in which the most robust response authentication technology like challenge response has been developed and applied to nuclear I&C systems. This paper presents a challenge response authentication mechanism for a Programmable Logic Controller (PLC) system used as a control system in the safety system of the Advanced Power Reactor (APR) 1400 NPP.

  • https://doi.org/10.1016/j.net.2019.05.012 인용 PDF KSCI