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http://dx.doi.org/10.4491/KSEE.2017.39.2.74

Establishment of the Appropriate Risk Standard through the Risk Assessment of Accident Scenario  

Kim, Kun-Ho (Department of Environmental Technology & Safety Technology Convergence, Inha University)
Chun, Young-Woo (Department of Environmental Technology & Safety Technology Convergence, Inha University)
Hwang, Yong-Woo (Department of Environmental Technology & Safety Technology Convergence, Inha University)
Lee, Ik-Mo (Department of Environmental Technology & Safety Technology Convergence, Inha University)
Kwak, In-ho (Department of Environmental Technology & Safety Technology Convergence, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.39, no.2, 2017 , pp. 74-81 More about this Journal
Abstract
An off-site consequence analysis is used to calculate the risks when hazardous chemicals that is being used on-site has been exposed off-site; the biggest factor that impacts the risk is the risks of accident scenarios. This study seeks to calculate risks according to accident scenarios by applying OGP/LOPA risk calculating methods for similar facilities, calculate risk reduction ratio by inspecting applicable IPL for incidents, and propose an appropriate risk standard for different risk calculating methods. Considering all applicable IPL when estimating the safety improvement of accident scenarios, the risk of OGP is 8.05E-04 and the risk of LOPA is 1.00E-04, According to the case of IPL, the risk is 1.34E-02. The optimal risk level for accident scenarios using LOPA was $10^{-2}$, but the appropriate risk criteria for accident scenarios in foreign similar studies were $10^{-3}{\sim}10^{-4}$, the risk of a scenario can be determined at an unacceptable level. When OGP is applied, it is analyzed as acceptable level, but in case of applying LOPA, all applicable IPL should be applied in order to satisfy the acceptable risk level. Compared to OGP, the risk is high when LOPA is applied. Therefore, the acceptable risk level should be set differently for each risk method.
Keywords
Off-site Consequence Analysis; Risk of Accident Scenarios; Independent Protection Layer; Appropriate Risk Standard;
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