Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Semi-quantitative Risk Assessment using Bow-tie Method for the Establishment of Safety Management System of Hydrogen Fuel Storage Facility in a Combined Cycle Power Plant

복합화력발전소 내 수소연료 저장설비의 안전관리 체계 구축을 위한 Bow-tie 기법을 활용한 반정량적 위험성 평가

  • Hee Kyung Park (Department of Safety Engineering, Incheon National University) ;
  • Si Woo Jung (Department of Safety Engineering, Incheon National University) ;
  • Yoo Jeong Choi (Department of Safety Engineering, Incheon National University) ;
  • Min Chul Lee (Department of Safety Engineering, Incheon National University)
  • 박희경 (인천대학교 안전공학과) ;
  • 정시우 (인천대학교 안전공학과) ;
  • 최유정 (인천대학교 안전공학과) ;
  • 이민철 (인천대학교 안전공학과)
  • Received : 2024.01.08
  • Accepted : 2024.04.15
  • Published : 2024.04.30
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Abstract

Hydrogen has been selected as one of the key technologies for reducing CO2 emissions to achieve carbon neutrality by 2050. However, hydrogen safety issues should be fully guaranteed before the commercial and widespread utilization of hydrogen. Here, a bow-tie risk assessment is conducted for the hydrogen fuel supply system in a gas turbine power plant, which can be a mass consumption application of hydrogen. The bow-tie program is utilized for a qualitative risk assessment, allowing the analysis of the causes and consequences according to the stages of accidents. This study proposed an advanced bow-tie method, which includes the barrier criticality matrix and visualized maps of quantitative risk reduction. It is based on evaluating the importance of numerous barriers for the extent of their impact. In addition, it emphasizes the prioritization and concentrated management of high-importance barriers. The radar chart of a bow tie allows the visual comparison of risk levels before/after the application of barriers (safety measures). The risk reduction methods are semi-quantitatively analyzed utilizing the criticality matrix and radar chart, and risk factors from multiple aspects are derived. For establishing a secure hydrogen fuel storage system, the improvements suggested by the bow-tie risk assessment results, such as 'Ergonomic equipment design to prevent human error' and 'Emergency shutdown system,' will enhance the safety level. It attempts to contribute to the development and enhancement of an efficient safety management system by suggesting a method of calculating the importance of barriers based on the bow-tie risk assessment.

Keywords

Acknowledgement

This work was supported by Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government(MOTIE) (RS-2023-00270080, Development of a method for testing and evaluating hydrogen turbine combustor, 100%)

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