• KIPS Transactions on Computer and Communication Systems
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• v.2 no.12
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• pp.561-568
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• 2013

Instrumentation and control system in nuclear power plant performs protecting, controling and monitoring safety operation of Nuclear Power Plant. As cyber attack to the control equipment of instrumentation and control system can cause reactor shutdown and radiation release, it is required to design the instrumentation and control system considering cyber security in accordance with regulatory guides and industrial standards. In this paper, we proposed a design method of uni-directional communication structure which is required in the design of defense-in-depth model according to regulatory guides and industrial standards and we implemented a communication board with the proposed method. This communication board was tested in various test environments and test items and we concluded it can provide uni-directional communication structure required to design of defense-in-depth model against cyber attack by analyzing the results. The proposed method and implemented communication board were applied in the design of SMART (system-integrated modular advanced reactor) I&C (instrumentation and control) systems.

• Nuclear industry
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• v.21 no.12 s.226
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• pp.7-8
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• 2001

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.87-88
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• 2022

"국민안심" 구현을 위한 가동원전의 안전성 확보에 대하여 예측, 예방, 대응 분야에서 연구를 진행하고 있으며,노심손상빈도(CDF)를 1/2수준으로 저감하기 위한 가동원전 심층방어 강화 기술에 대한 연구를 진행하고 있다. 가동원전의 화재 방호 설비를 강화하고자 디지털 트윈 기반의 플랫폼을 구축하여 화재 감지 시스템과 화재 진압 설비에 대한 개발을 진행하고 있다. 원전 자체 소방대가 화재현장을 원활하게 진입할 수 있게 가능하며 더 나아가 CDF를 저감하기 위해 화재 진압실패확률(Non-Suppression Probability)을 낮추고자 하였다. 본 연구를 통해 기존대비 효과적인 화재 방호 설비 기술이 개발될 것으로 보이며 이와 더불어 비즈니스 모델을 구축하여 신사업을 도모할 수 있을 것으로 기대된다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.343-344
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• 2023

본 연구는 국가중요시설의 청사 내에 근무하는 청사보안과 안전유지, 질서유지를 담당하는 방호직 공무원에게 발생하는 다양한 민원인 불량행동의 유형과 국가중요시설에서 일어나는 각 유형에 맞는 민원인 불량행동에 대한 개선방안을 효율적으로 제시하는데 그 목적이 있다. 이에 인터뷰를 통해 국가중요시설에서 근무하는 방호직공무원이 느끼는 민원인 불량행동이 어떠한 유형으로 있는지 조사하였고 개별면담을 통해 나타난 대표적인 민원인 불량행동의 유형들은 첫째, 국가중요시설 내에서 큰 소리를 지르고 욕설을 하는 언어폭력형 둘째, 각 국가기관 및 지자체의 국가중요시설에서 서비스 업무수행 과정 중 다른 타 민원인이 있음에도 본인 자신의 이익과 편의를 위해 행해지는 행위를 하는 이기주의형 셋째, 각 국가중요시설의 규정 및 내규가 있음에도 규정된 규칙을 무시하고 따르지 않는 규칙위반형 등이 있다. 이에 따라 각 유형별 민원인 불량행동에 대한 개선방안 항목들로 첫째, 방호직공무원 교육의 체계화, 둘째, 민원인을 응대할 수 있는 기관의 내규 및 규칙, 셋째, 민원인에게 겪는 스트레스를 해소할 수 있는 환경을 제시하였다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.119-120
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• 2022

본 연구는 국가중요시설의 청사 내에 근무하는 청사보안과 안전유지, 질서유지를 담당하는 방호직 공무원에게 발생하는 다양한 민원인 불량행동의 유형과 국가중요시설에서 일어나는 각 유형에 맞는 민원인 불량행동에 대한 개선방안을 효율적으로 제시하는데 그 목적이 있다. 이에 인터뷰를 통해 국가중요시설에서 근무하는 방호직공무원이 느끼는 민원인 불량행동이 어떠한 유형으로 있는지 조사하였고 개별면담을 통해 나타난 대표적인 민원인 불량행동의 유형들은 첫째, 국가중요시설 내에서 큰 소리를 지르고 욕설을 하는 언어폭력형 둘째, 각 국가기관 및 지자체의 국가중요시설에서 서비스 업무수행 과정 중 다른 타 민원인이 있음에도 본인 자신의 이익과 편의를 위해 행해지는 행위를 하는 이기주의형 셋째, 각 국가중요시설의 규정 및 내규가 있음에도 규정된 규칙을 무시하고 따르지 않는 규칙위반형 등이 있다. 이에 따라 각 유형별 민원인 불량행동에 대한 개선방안 항목들로 첫째, 방호직공무원 교육의 체계화, 둘째, 민원인을 응대할 수 있는 기관의 내규 및 규칙, 셋째, 민원인에게 겪는 스트레스를 해소할 수 있는 환경을 제시하였다.

• Fire Science and Engineering
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• v.24 no.4
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• pp.116-122
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• 2010

The fire protection system of nuclear power plants shall be designed, constructed and operated, through a defense-in depth criterion to suppress the leakage of radioactivity to the outside and to allow the safety shutdown function when a fire occurs. In order to achieve these purposes, most of countries abroad operating the nuclear power plants keep up the integrated regulations, however we have two guidelines, the fire protection service act and the nuclear energy act, as mandatory requirements to apply to the fire protection systems in nuclear power plants. It has shown that USA, Canada and Japan which have long experience in operating nuclear power plants have regulations integrated technically for fire protection system of nuclear power plants. It is proposed that the things once verified the risk analysis of the fire hazard by the nuclear law in the design for fire suppression system in plants should be authorized by the fire protection service act as an exception.

• Fire Science and Engineering
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• v.34 no.3
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• pp.134-140
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• 2020

Nuclear power plants (NPPs) in Korea are required to be maintained using a defense in-depth approach to prevent leakage of radioactive substances outside the plant and allow safe shutdown in the event of a fire. Periodic testing must be conducted to ensure that the fire protection facilities perform as required by the laws for various nuclear reactor types. In June 2017, for the first time in Korea, a nuclear plant, Kori Unit 1, was permanently shut down. It was prepared for decommissioning in accordance with the fire protection regulations imposed by the regulatory body. However, a standard protocol is necessary for systematically establishing the fire protection program for decommissioning of NPPs in the future. Therefore, the nuclear legal systems of countries with many operating nuclear power plants, such as the United States, Japan, Canada, and various European countries, were reviewed and guidelines for establishing a fire protection program for decommissioning NPPs was suggested; the fire protection requirements stated by Reg Guide 1.191 (Decommissioning fire protection program for NPPs during decommissioning and permanent shutdown) were used as a model. Suggestions for establishing legal regulations to optimize fire protection programs and secure basic technology for decommissioning NPPs were also made.

• Fire Science and Engineering
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• v.26 no.6
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• pp.38-44
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• 2012

The purpose of fire protection for the nuclear power plants (NPPs) is to ensure safe shutdown state of the reactor, to minimize the release of radioactive materials to the environment, to provide physical safety of the on-site personnel, and to limit the property damage. Fire protection and extinguishing equipments are one of the important protection measures based on the defense-in-depth concept, which can promptly detect and control and extinguish those fires that do occur, thereby limiting fire damage. However, a separate evaluation process might be additionally necessary for the construction permit and operating license because the fire protection laws of the NEMA for installation standards of the fire protection systems is not fully characterized for the NPPs. It is also not easy to implement the regulations such as the performance based design concept for fire protection system of the NPPs which are characterized for a relatively low density of employee. This study suggests a guideline for the improvement of the technical standards for fire protection systems of the NPPs by evaluating the fundamental problems drawn by reviewing laws and regulatory guides relevant to fire protection and by evaluating the applicability of the KEPIC FPN in domestic nuclear power plants.

• Journal of Radiation Protection and Research
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• v.36 no.3
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• pp.154-159
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• 2011

To evaluate the radiation exposure of workers participating in task where high radiation exposure is expected, two-dosimeter is typically provided radiation workers, one on the chest and the other on the back, at Korean nuclear power plants (NPPs). In a previous study, the NCRP (55:50) algorithm was selected as the optimal two-dosimeter algorithm (TDA) with various field tests and this TDA has been applied to all Korean NPPs since 2006. In 2007, the International Commission on Radiological Protection (ICRP) published the new ICRP recommendation, ICRP 103, which provides the revised weighting factors for both radiation and tissues and the new reference phantom. In this study, the applicability of current NCRP (55:50) algorithm at Korean NPPs for ICRP 103 was analyzed. As a result, it was found that the NCRP (55:50) algorithm is still effective to estimate the effective dose of workers under ICRP 103.

• Fire Science and Engineering
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• v.20 no.4 s.64
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• pp.13-18
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• 2006

The fire protection regulation for the nuclear power plants is based on the qualitative fire hazard assessment and the quantitative fire risk analysis, and the fire risk is managed by the fire protection plan with the appropriate balance among the fire prevention, fire suppression and the minimization of the fire effect. In these days, the zone model or the field model is generally used for the detail evaluation for the fire risk. At this paper, with consideration of the present trend, we evaluate whether the quantitative fire risk analysis and the assessment of fire result for fire areas at nuclear power plants can be possible by use of Fire Dynamics Simulator (FDS) that is the state-of-the-art fire modeling tool. Consequently, it is expected that the quantitative fire risk evaluation propelled by the fire modeling can be available as an applicable tool to improve the core damage frequency as well as the quantitative fire risk analysis.